prepare to release v7.4.0

Removed LV_USE_GROUP guard macro for signals != LV_SIGNAL_CONTROL in signal functions of roller and spinbox to allow signal propagating to ancestors

.github/FUNDING.yml

@@ -1 +1 @@
-custom: ["https://littlevgl.com/donate"]
+custom: ["https://paypal.me/littlevgl?locale.x=en_US"]

.github/workflows/ccpp.yml

@@ -14,4 +14,4 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Run tests
-      run: cd tests; python ./build.py
+      run: sudo apt-get install libpng-dev; cd tests; python ./build.py

CHANGELOG.md

@@ -1,12 +1,69 @@
 # Changelog
 
-## v7.3.0 (planned on 04.08.2020)
-Available in the `dev` branch
+## v7.4.0 (01.09.2020)
 
-## v7.2.0 (planned on 21.07.2020)
-*Available in the `master` branch*
+The main new features of v7.4 are run-time font loading, style caching and arc knob with value setting by click.
 
 ### New features
+- Add `lv_font_load()` function - Loads a `lv_font_t` object from a binary font file
+- Add `lv_font_free()` function - Frees the memory allocated by the `lv_font_load()` function
+- Add style caching to reduce acces time of properties with default value
+- arc: add set value by click feature
+- arc: add `LV_ARC_PART_KNOB` similarly to slider
+- send gestures even is the the obejct was dragged. User can check dragging with `lv_indev_is_dragging(lv_indev_act())` in the event function. 
+
+### Bugfixes
+- Fix color bleeding on border drawing
+- Fix using 'LV_SCROLLBAR_UNHIDE' after 'LV_SCROLLBAR_ON'
+- Fix croping of last column/row if an image is zoomed
+- Fix zooming and rotateing mosaic images
+- Fix deleting tabview with LEFT/RIGHT tab position
+- Fix btnmatrix to not send event when CLICK_TRIG = true and the cursor slid from a pressed button
+- Fix roller width if selected text is larger than the normal
+
+## v7.3.1 (18.08.2020)
+
+### Bugfixes
+- Fix drawing value string twice
+- Rename  `lv_chart_clear_serie` to `lv_chart_clear_series` and `lv_obj_align_origo` to `lv_obj_align_mid`
+- Add linemeter's mirror feature again
+- Fix text decor (udnerline strikethrough) with older versions of font converter
+- Fix setting local style property multiple times 
+- Add missing background drawing and radius handling to image button
+- Allow adding extra label to list buttons
+- Fix crash if `lv_table_set_col_cnt` is called before `lv_table_set_row_cnt` for the first time
+- Fix overflow in large image transformations
+- Limit extra button click area of button matrix's buttons. With large paddings it was counter intuitive. (Gaps are mapped to button when clicked).
+- Fix `lv_btnmatrix_set_one_check` not forcing exactly one button to be checked
+- Fix color picker invalidation in rectangle mode
+- Init disabled days to gray color in calendar
+
+## v7.3.0 (04.08.2020)
+
+### New features
+- Add `lv_task_get_next`
+- Add `lv_event_send_refresh`, `lv_event_send_refresh_recursive` to easily send `LV_EVENT_REFRESH` to object
+- Add `lv_tabview_set_tab_name()` function - used to change a tab's name
+- Add `LV_THEME_MATERIAL_FLAG_NO_TRANSITION` and `LV_THEME_MATERIAL_FLAG_NO_FOCUS` flags
+- Reduce code size by adding: `LV_USE_FONT_COMPRESSED` and `LV_FONT_USE_SUBPX` and applying some optimization
+- Add `LV_MEMCPY_MEMSET_STD` to use standard `memcpy` and `memset`
+
+### Bugfixes
+- Do not print warning for missing glyph if its height OR width is zero.
+- Prevent duplicated sending of `LV_EVENT_INSERT` from text area
+- Tidy outer edges of cpicker widget.
+- Remove duplicated lines from `lv_tabview_add_tab`
+- btnmatrix: hadle combined states of buttons (e.g. chacked + disabled)
+- textarea: fix typo in lv_textarea_set_sscrollbar_mode
+- gauge: fix image needle drawing
+- fix using freed memory in _lv_style_list_remove_style
+
+
+## v7.2.0 (21.07.2020)
+
+### New features
+- Add screen transitions with `lv_scr_load_anim()`
+- Add display background color, wallpaper and opacity. Shown when the screen is transparent. Can be used with `lv_disp_set_bg_opa/color/image()`.
 - Add `LV_CALENDAR_WEEK_STARTS_MONDAY`
 - Add `lv_chart_set_x_start_point()` function - Set the index of the x-axis start point in the data array
 - Add `lv_chart_set_ext_array()` function - Set an external array of data points to use for the chart

README.md

@@ -1,8 +1,4 @@
 <h1 align="center"> LVGL - Light and Versatile Graphics Library</h1>
-<p align="center">
-<a href="https://github.com/lvgl/lvgl/blob/master/LICENCE.txt"><img src="https://img.shields.io/badge/licence-MIT-blue.svg"></a>
-<a href="https://github.com/lvgl/lvgl/releases/tag/v7.0.0"><img src="https://img.shields.io/badge/version-7.1.0-blue.svg"></a>
-</p>
 
 <p align="center">
 <img src="https://lvgl.io/assets/images/img_1.png">
@@ -78,7 +74,7 @@ Basically, every modern controller (which is able to drive a display) is suitabl
   <tr>
     <td> <strong>Heap</strong></td>
     <td> &gt; 2 kB </td>
-    <td> &gt; 16 kB</td>
+    <td> &gt; 8 kB</td>
   </tr>
   
   <tr>
@@ -145,7 +141,7 @@ void btn_event_cb(lv_obj_t * btn, lv_event_t event)
 ![LVGL button with label example](https://raw.githubusercontent.com/lvgl/docs/latest/misc/simple_button_example.gif)
 
 ### LVGL from Micropython
-Learn more about [Micropython](https://docs.lvgl.io/en/html/get-started/micropython).
+Learn more about [Micropython](https://docs.lvgl.io/latest/en/html/get-started/micropython.html).
 ```python
 # Create a Button and a Label
 scr = lv.obj()

a.patch

@@ -0,0 +1,29 @@
+diff --git a/scripts/release.py b/scripts/release.py
+index 28370c66..bc5234e7 100755
+--- a/scripts/release.py
++++ b/scripts/release.py
+@@ -395,12 +395,12 @@ def docs_update_dev_version():
+     os.chdir("../")
+ 
+ 
+-def publish_dev():   
++def publish_dev_and_master():   
+     pub_cmd = "git checkout dev; git push origin dev"
+     cmd("cd lvgl; " + pub_cmd)    
++    pub_cmd = "git checkout master; git push origin master"
++    cmd("cd lvgl; " + pub_cmd)    
+ 
+-    pub_cmd = "git checkout dev; git push origin dev"
+-    cmd("cd docs; " + pub_cmd)    
+     cmd("cd docs; git checkout master; ./update.py latest dev")
+ 
+ def cleanup():
+@@ -463,7 +463,7 @@ if __name__ == '__main__':
+ 
+         lvgl_update_dev_version()
+         docs_update_dev_version()
+-        publish_dev()
++        publish_dev_and_master()
+         
+     cleanup()
+     

docs/ROADMAP.md

@@ -0,0 +1,38 @@
+# Roadmap
+
+This is a summary for thenew fatures of the major releases and a collection of ideas. 
+
+This list indicates only the current intention and can be changed.
+
+## v8
+Planned to September/October 2020
+- New scrolling:
+  - See [feat/new-scroll](https://github.com/lvgl/lvgl/tree/feat/new-scroll) branch and  [#1614](https://github.com/lvgl/lvgl/issues/1614)) issue.
+  - Remove `lv_page` and support scrolling on `lv_obj`
+  - Support "elastic" scrolling when scrolled in
+  - Support scroll chaining among any objects types (not only `lv_pages`s)
+  - Remove `lv_drag`. Similar effect can be achieved by setting the position in `LV_EVENT_PRESSING`
+  - Add snapping?
+  - Already working
+- New layouts:
+  - See [#1615](https://github.com/lvgl/lvgl/issues/1615) issue
+  - [CSS Flexbox](https://css-tricks.com/snippets/css/a-guide-to-flexbox/)-like layout support
+  - Besides setting width/height in `px` add support to `partent percentage` and `screen percentage`.
+  - Work in progress
+- Simplified File system interface ([feat/new_fs_api](https://github.com/lvgl/lvgl/tree/feat/new-fs-api) branch) to make porting easier
+  - Work in progress
+- Remove the align parameter from `lv_canvas_draw_text`
+
+## v9
+- Simplify `group`s. Discussion is [here](https://forum.lvgl.io/t/lv-group-tabindex/2927/3).
+
+## Ideas
+- Unit testing (gtest?). See [#1658](https://github.com/lvgl/lvgl/issues/1658)
+- Benchmarking (gem5?). See [#1660](https://github.com/lvgl/lvgl/issues/1660)
+- CPP binding. See [Forum](https://forum.lvgl.io/t/is-it-possible-to-officially-support-optional-cpp-api/2736)
+- Optmize font decompression
+- Switch to RGBA colors in styles
+- Need coverage report for tests
+- Need static analize (via coverity.io or somehing else)
+- Support dot_begin and dot_middle long modes for labels
+- Add new label alignment modes. [#1656](https://github.com/lvgl/lvgl/issues/1656)

examples/arduino/README.md

@@ -10,7 +10,7 @@ To get all this to work you have to setup TFT_eSPI to work with your TFT display
 
 LVGL library has its own configuration file called `lv_conf.h`. When LVGL is installed to followings needs to be done to configure it:
 1. Go to directory of the installed Arduno libraries
-2. Go to `lvgl` and copy `lv_conf_template.h` as `lvgl.h` next to the `lvgl` folder.
+2. Go to `lvgl` and copy `lv_conf_template.h` as `lv_conf.h` next to the `src` folder.
 3. Open `lv_conf.h` and change the first `#if 0` to `#if 1`
 4. Set the resolution of your display in `LV_HOR_RES_MAX` and `LV_VER_RES_MAX`
 5. Set the color depth of you display in `LV_COLOR_DEPTH`

library.json

@@ -1,6 +1,6 @@
 {
 	"name": "lvgl",
-    "version": "7.2.0",
+    "version": "7.4.0",
 	"keywords": "graphics, gui, embedded, tft, lvgl",
 	"description": "Graphics library to create embedded GUI with easy-to-use graphical elements, beautiful visual effects and low memory footprint. It offers anti-aliasing, opacity, and animations using only one frame buffer.",
 	"repository": {

library.properties

@@ -0,0 +1,10 @@
+name=lvgl
+version=7.4.0
+author=kisvegabor
+maintainer=kisvegabor,embeddedt,pete-pjb
+sentence=Full-featured Graphics Library for Embedded Systems
+paragraph=Powerful and easy-to-use embedded GUI with many widgets, advanced visual effects (opacity, antialiasing, animations) and low memory requirements (16K RAM, 64K Flash).
+category=Display
+url=https://lvgl.io
+architectures=*
+includes=lvgl.h

lv_conf_template.h

@@ -1,6 +1,6 @@
 /**
  * @file lv_conf.h
- * Configuration file for LVGL v7.2.0
+ * Configuration file for v7.4.0-dev
  */
 
 /*
@@ -97,6 +97,10 @@ typedef int16_t lv_coord_t;
 #  define LV_MEM_CUSTOM_FREE    free         /*Wrapper to free*/
 #endif     /*LV_MEM_CUSTOM*/
 
+/* Use the standard memcpy and memset instead of LVGL's own functions.
+ * The standard functions might or might not be faster depending on their implementation. */
+#define LV_MEMCPY_MEMSET_STD    0
+
 /* Garbage Collector settings
  * Used if lvgl is binded to higher level language and the memory is managed by that language */
 #define LV_ENABLE_GC 0
@@ -150,7 +154,7 @@ typedef void * lv_anim_user_data_t;
 
 #endif
 
-/* 1: Enable shadow drawing*/
+/* 1: Enable shadow drawing on rectangles*/
 #define LV_USE_SHADOW           1
 #if LV_USE_SHADOW
 /* Allow buffering some shadow calculation
@@ -160,6 +164,15 @@ typedef void * lv_anim_user_data_t;
 #define LV_SHADOW_CACHE_SIZE    0
 #endif
 
+/*1: enable outline drawing on rectangles*/
+#define LV_USE_OUTLINE  1
+
+/*1: enable pattern drawing on rectangles*/
+#define LV_USE_PATTERN  1
+
+/*1: enable value string drawing on rectangles*/
+#define LV_USE_VALUE_STR    1
+
 /* 1: Use other blend modes than normal (`LV_BLEND_MODE_...`)*/
 #define LV_USE_BLEND_MODES      1
 
@@ -391,11 +404,20 @@ typedef void * lv_indev_drv_user_data_t;            /*Type of user data in the i
  * but with > 10,000 characters if you see issues probably you need to enable it.*/
 #define LV_FONT_FMT_TXT_LARGE   0
 
+/* Enables/disables support for compressed fonts. If it's disabled, compressed
+ * glyphs cannot be processed by the library and won't be rendered.
+ */
+#define LV_USE_FONT_COMPRESSED 1
+
+/* Enable subpixel rendering */
+#define LV_USE_FONT_SUBPX 1
+#if LV_USE_FONT_SUBPX
 /* Set the pixel order of the display.
  * Important only if "subpx fonts" are used.
  * With "normal" font it doesn't matter.
  */
 #define LV_FONT_SUBPX_BGR    0
+#endif
 
 /*Declare the type of the user data of fonts (can be e.g. `void *`, `int`, `struct`)*/
 typedef void * lv_font_user_data_t;
@@ -417,7 +439,10 @@ typedef void * lv_font_user_data_t;
 /* A fast and impressive theme.
  * Flags:
  * LV_THEME_MATERIAL_FLAG_LIGHT: light theme
- * LV_THEME_MATERIAL_FLAG_DARK: dark theme*/
+ * LV_THEME_MATERIAL_FLAG_DARK: dark theme
+ * LV_THEME_MATERIAL_FLAG_NO_TRANSITION: disable transitions (state change animations)
+ * LV_THEME_MATERIAL_FLAG_NO_FOCUS: disable indication of focused state)
+ * */
  #define LV_USE_THEME_MATERIAL    1
 
 /* Mono-color theme for monochrome displays.
@@ -662,6 +687,9 @@ typedef void * lv_obj_user_data_t;
 #  define LV_ROLLER_INF_PAGES         7
 #endif
 
+/*Rotary (dependencies: lv_arc, lv_btn)*/
+#define LV_USE_ROTARY     1
+
 /*Slider (dependencies: lv_bar)*/
 #define LV_USE_SLIDER    1
 

lvgl.h

@@ -10,6 +10,15 @@
 extern "C" {
 #endif
 
+
+/***************************
+ * CURRENT VERSION OF LVGL
+ ***************************/
+#define LVGL_VERSION_MAJOR   7
+#define LVGL_VERSION_MINOR   4
+#define LVGL_VERSION_PATCH   0
+#define LVGL_VERSION_INFO ""
+
 /*********************
  *      INCLUDES
  *********************/
@@ -31,6 +40,7 @@ extern "C" {
 #include "src/lv_themes/lv_theme.h"
 
 #include "src/lv_font/lv_font.h"
+#include "src/lv_font/lv_font_loader.h"
 #include "src/lv_font/lv_font_fmt_txt.h"
 #include "src/lv_misc/lv_printf.h"
 
@@ -72,14 +82,11 @@ extern "C" {
 
 #include "src/lv_api_map.h"
 
+//#define LV_BUILD_TEST 1
+
 /*********************
  *      DEFINES
  *********************/
-/*Current version of LVGL*/
-#define LVGL_VERSION_MAJOR   7
-#define LVGL_VERSION_MINOR   2
-#define LVGL_VERSION_PATCH   0
-#define LVGL_VERSION_INFO ""
 
 /**********************
  *      TYPEDEFS

scripts/release.py

@@ -1,245 +1,525 @@
 #!/usr/bin/env python
- 
+
+# Release lvgl, lv_examples, lv_drivers. docs, blog and prepare the development of the next major, minoror bugfix release
+# Usage: ./release,py bugfix | minor | major
+# The option means what type of versin to prepare for development after release
+#
+# STEPS:
+#  - clone all 5 repos
+#  - get the version numnber from lvgl.h
+#  - set release branch (e.g. "release/v7")
+#  - prepare lvgl
+#    - run lv_conf_internal.py
+#    - run code formatter 
+#    - clear LVGL_VERSION_INFO (set to "")
+#    - run Doxygen 
+#    - update the version in lvgl's library.json, library.properties, lv_conf_template.h
+#    - update CHANGELOG.md
+#    - commit changes 
+#  - prepare lv_examples
+#    - upadte the required LVGL version in lv_examples.h (LV_VERSION_CHECK) 
+#    - update the version in lv_ex_conf_template.h
+#  - prepare lv_drivers
+#    - update the version in library.json, lv_drv_conf_template.h      
+#  - prepare docs
+#    - update API XML 
+#    - clear the versiopn info (should be plain vx.y.z)
+#  - tag all repos with the new version
+#  - merge to release branches
+#  - blog: add release post
+#  - push tags and commits
+#  - docs: run ./updade.py release/vX
+#
+# If --patch
+#  - merge master to dev branches
+#  - increment patch version by 1 and append "-dev". E.g. "vX.Y.(Z+1)-dev"
+#  - update version numbers in lvgl and docs
+#  - commit and push
+#  - docs: run ./updade.py latest dev
+#
+# Else (not --patch)
+#  - merge master to dev  
+#  - merge the dev to master
+#  - increment version number like "vX.(Y+1).0-dev"
+#  - apply the new version in dev branches of lvgl, lv_examples, lv_drivers, docs
+#  - commit and push to dev branches
+#  - docs: run ./updade.py latest dev
+
 import re
-import os
-lastNum = re.compile(r'(?:[^\d]*(\d+)[^\d]*)+')
+import os, fnmatch
+import os.path
+from os import path
+from datetime import date
+import sys
 
-   
-def title(t):
-  print("\n---------------------------------")
-  print(t)
-  print("---------------------------------")
+upstream_org_url = "https://github.com/lvgl/"
+workdir = "./release_tmp"
+proj_list = [ "lv_sim_eclipse_sdl"]
 
-   
-def cmd(c):
+ver_major = -1
+ver_minor = -1
+ver_patch = -1
+
+ver_str = ""
+dev_ver_str = ""
+release_br = ""
+release_note = ""
+
+prepare_type = ['major', 'minor', 'bugfix']
+
+dev_prepare = 'minor'
+
+def upstream(repo):
+    return upstream_org_url + repo + ".git"
+
+def cmd(c, exit_on_err = True):
   print("\n" + c)
   r = os.system(c)       
   if r:
     print("### Error: " + str(r))
-
-def lvgl_clone():
-  title("lvgl: Clone")
-  cmd("git clone https://github.com/lvgl/lvgl.git")
-  os.chdir("./lvgl")
-  cmd("git co master") 
-
-def lvgl_format():
-  title("lvgl: Run code formatter")
-  os.chdir("./scripts")
-  cmd("./code-format.sh")
-  os.system("git ci -am 'Run code formatter'")
-  os.chdir("..")
-
-def lvgl_update_version():
-  title("lvgl: Update version number")
-
-  f = open("./lvgl.h", "r")
-      
-  outbuf = ""
-  major_ver = -1
-  minor_ver = -1
-  patch_ver = -1
-      
-  for i in f.read().splitlines():
-    r = re.search(r'^#define LVGL_VERSION_MAJOR ', i)
-    if r: 
-      m = lastNum.search(i)
-      if m: major_ver = m.group(1)
-
-    r = re.search(r'^#define LVGL_VERSION_MINOR ', i)
-    if r: 
-      m = lastNum.search(i)
-      if m: minor_ver = m.group(1)
-      
-    r = re.search(r'^#define LVGL_VERSION_PATCH ', i)
-    if r: 
-      m = lastNum.search(i)
-      if m: patch_ver = m.group(1)
-     
-      
-    r = re.search(r'^#define LVGL_VERSION_INFO ', i)
-    if r: 
-      i = "#define LVGL_VERSION_INFO \"\""
-       
-    outbuf += i + '\n'
-   
-  f.close()
-
-  f = open("./lvgl.h", "w")
-      
-  f.write(outbuf)
-  f.close()
+    if exit_on_err: exit(int(r))
     
-  s = "v" + str(major_ver) + "." + str(minor_ver) + "." + str(patch_ver)
-  print("New version:" + s)
-  return s
+def define_set(fn, name, value):    
+    print("In " + fn + " set " + name + " to " + value)
+    
+    new_content = ""      
+    s = r'^ *# *define +' + str(name).rstrip()
+    
+    f = open(fn, "r")
+    for i in f.read().splitlines():
+        r = re.search(s, i)
+        if r: 
+            d = i.split("define")
+            i = d[0] + "define " + name + " " + value 
+        new_content += i + '\n'
+     
+    f.close()
+    
+    f = open(fn, "w")
+    f.write(new_content)
+    f.close()
+    
+def clone_repos():
+    cmd("rm -fr " + workdir)
+    cmd("mkdir " + workdir)
+    os.chdir(workdir)
 
+    #For debuging just copy the repos
+    #cmd("cp -a ../repos/. .")
+    #return
 
+    cmd("git clone " + upstream("lvgl") + "; cd lvgl; git checkout master")
+    cmd("git clone " + upstream("lv_examples") + "; cd lv_examples; git checkout master")
+    cmd("git clone " + upstream("lv_drivers") + "; cd lv_drivers; git checkout master")
+    cmd("git clone --recurse-submodules " + upstream("docs") + "; cd docs; git checkout master")
+    cmd("git clone " + upstream("blog") + "; cd blog; git checkout master")
 
-def lvgl_update_library_json(v):
-  title("lvgl: Update version number in library.json")
+    for p in proj_list:
+        cmd("git clone " + upstream(p) + " --recurse-submodules ; cd " + p + "; git checkout master")
+        
 
-  f = open("./library.json", "r")
-  vn = v[1:]    
-  outbuf = ""
+def get_lvgl_version(br):
+    print("Get LVGL's version")
+    
+    global ver_str, ver_major, ver_minor, ver_patch, release_br 
+    
+    os.chdir("./lvgl")
+    
+    cmd("git checkout " + br)
+    
+    f = open("./lvgl.h", "r")
       
-  for i in f.read().splitlines():
-    r = re.search(r'"version": ', i)
-    if r: 
-      i = '    "version": "' + vn + '",'
-       
-    outbuf += i + '\n'
-   
-  f.close()
+    lastNum = re.compile(r'(?:[^\d]*(\d+)[^\d]*)+')
+    for i in f.read().splitlines():
+        r = re.search(r'^#define LVGL_VERSION_MAJOR ', i)
+        if r: 
+            m = lastNum.search(i)
+            if m: ver_major = m.group(1)
 
-  f = open("./library.json", "w")
+        r = re.search(r'^#define LVGL_VERSION_MINOR ', i)
+        if r: 
+            m = lastNum.search(i)
+            if m: ver_minor = m.group(1)
       
-  f.write(outbuf)
-  f.close()
+        r = re.search(r'^#define LVGL_VERSION_PATCH ', i)
+        if r: 
+            m = lastNum.search(i)
+            if m: ver_patch = m.group(1)
+     
+    f.close()
+    
+    cmd("git checkout master")
+    
+    ver_str =  "v" + str(ver_major) + "." + str(ver_minor) + "." + str(ver_patch)
+    print("New version:" + ver_str)
+    
+    release_br = "release/v" + ver_major
+    
+    os.chdir("../")
+    
+def update_version():
+    templ = fnmatch.filter(os.listdir('.'), '*templ*')
+    
+    if templ[0]:    
+        print("Updating version in " + templ[0])
+        cmd("sed -i -r 's/v[0-9]+\.[0-9]+\.[0-9]+/"+ ver_str +"/' " + templ[0])
+    
+    if os.path.exists("library.json"):  
+        print("Updating version in library.json")
+        cmd("sed -i -r 's/[0-9]+\.[0-9]+\.[0-9]+/"+ ver_str[1:] +"/' library.json")
+        
+    if path.exists("library.properties"):  
+        print("Updating version in library.properties")
+        cmd("sed -i -r 's/version=[0-9]+\.[0-9]+\.[0-9]+/"+ "version=" + ver_str[1:] + "/' library.properties")
+    
+def lvgl_prepare():
+    print("Prepare lvgl")
+    
+    global ver_str, ver_major, ver_minor, ver_patch 
+    
+    os.chdir("./lvgl")
+    define_set("./lvgl.h", "LVGL_VERSION_INFO", '\"\"')
+    
+    # Run some scripts
+    os.chdir("./scripts")
+    cmd("./code-format.sh")
+    cmd("./lv_conf_checker.py")
+    cmd("doxygen")
+    os.chdir("../")
 
-def lvgl_update_lv_conf_templ(ver_str):
-  title("lvgl: Update version number in lv_conf_template.h")
-  cmd("sed -i -r 's/v[0-9]+\.[0-9]+\.[0-9]+/"+ ver_str +"/' lv_conf_template.h ")
+    update_version()
+
+    #update CHANGLELOG
+    new_content = ""
+    f = open("./CHANGELOG.md", "r")
+    
+    global release_note
+    release_note = ""
+    note_state = 0  
+    for i in f.read().splitlines():
+        if note_state == 0:
+            r = re.search(r'^## ' + ver_str, i)
+            if r: 
+                i = i.replace("planned on ", "") 
+                note_state+=1
+                
+        elif note_state == 1: 
+            r = re.search(r'^## ', i)
+            if r:
+                note_state+=1
+            else:
+                release_note += i + '\n'
+                    
+        new_content += i + '\n'
+     
+    f.close()
+    
+    f = open("./CHANGELOG.md", "w")
+    f.write(new_content)
+    f.close()
+    
+    cmd('git commit -am "prepare to release ' + ver_str + '"')
+    
+    os.chdir("../")
+    
+    
+def lv_examples_prepare():
+    print("Prepare lv_examples")
+    global ver_str, ver_major, ver_minor, ver_patch 
+    
+    os.chdir("./lv_examples")
+    
+    update_version()
+    
+    cmd("sed -i -r 's/LV_VERSION_CHECK\([0-9]+, *[0-9]+, *[0-9]+\)/"+ "LV_VERSION_CHECK(" + ver_major + ", " + ver_minor + ", " + ver_patch + ")/' lv_examples.h")
+    
+    cmd('git commit -am "prepare to release ' + ver_str + '"')
+    
+    os.chdir("../")
+    
+def lv_drivers_prepare():
+    print("Prepare lv_drivers")
+    global ver_str, ver_major, ver_minor, ver_patch 
+    
+    os.chdir("./lv_drivers")
+    
+    update_version()
+    
+    cmd('git commit -am "prepare to release ' + ver_str + '"')
+    
+    os.chdir("../")
+    
+def docs_prepare():
+    print("Prepare docs")
+    global ver_str, ver_major, ver_minor, ver_patch 
+    
+    os.chdir("./docs")
+    
+    cmd("git co latest --") 
+    cmd("rm -rf xml");  
+    cmd("cp -r ../lvgl/docs/api_doc/xml .");  
+    cmd("git add xml");
+    
+    cmd("sed -i -r \"s/'v[0-9]+\.[0-9]+\.[0-9]+.*'/\'" + ver_str + "'/\" conf.py")   
+    
+    cmd('git commit -am "prepare to release ' + ver_str + '"')
+    
+    os.chdir("../")
+    
+def blog_add_post():
+    global ver_str, release_note
+    
+    os.chdir("./blog/_posts")
+    
+    post = "---\nlayout: post\ntitle: " + ver_str + " is released\nauthor: \"kisvegabor\"\ncover: /assets/release_cover.png\n---\n\n"
+    post += release_note
+    
+    today = date.today()
+    d = today.strftime("%Y-%m-%d")
+    
+    f = open(d + "-release_" + ver_str + ".md", "w")
+    f.write(post)
+    f.close()
+    
+    cmd("git add .")
+    cmd("git commit -am 'Add " + ver_str + " release post'")
+    
+    os.chdir("../../")
+        
+def add_tags():
+    global ver_str
+    tag_cmd = " git tag -a " + ver_str + " -m 'Release " + ver_str + "' " 
+    cmd("cd lvgl; " + tag_cmd)    
+    cmd("cd lv_examples; " + tag_cmd)    
+    cmd("cd lv_drivers; " + tag_cmd)    
+    cmd("cd docs; " + tag_cmd)    
+    
+def update_release_branches():
+    global release_br
+    merge_cmd = " git checkout " + release_br + "; git pull origin " + release_br + "; git merge master  -X ours; git push origin " + release_br + "; git checkout master" 
+    cmd("cd lvgl; " + merge_cmd)    
+    cmd("cd lv_examples; " + merge_cmd)    
+    cmd("cd lv_drivers; " + merge_cmd)    
+    
+    merge_cmd = " git checkout " + release_br + "; git pull origin " + release_br  + "; git merge latest  -X ours; git push origin " + release_br + "; git checkout latest" 
+    cmd("cd docs; " + merge_cmd)
+    
+def publish_master():   
+    
+    #Merge LVGL master to dev first to avoid "merge-to-dev.yml" running asynchronous
+    os.chdir("./lvgl")
+    cmd("git checkout dev")
+    cmd("git merge master -X theirs")
+    cmd("git add .")
+    cmd("git commit -am 'Merge master'")
+    cmd("git push origin dev")
+    cmd("git checkout master")    
+    os.chdir("../")
+    
+    pub_cmd = "git push origin master; git push origin " + ver_str
+    cmd("cd lvgl; " + pub_cmd)    
+    cmd("cd lv_examples; " + pub_cmd)    
+    cmd("cd lv_drivers; " + pub_cmd)    
+
+    pub_cmd = "git push origin latest; git push origin " + ver_str
+    cmd("cd docs; " + pub_cmd)    
+    cmd("cd docs; git checkout master; ./update.py " + release_br)
+    
+    pub_cmd = "git push origin master"
+    cmd("cd blog; " + pub_cmd)    
+    
+    
+def merge_to_dev():
+    merge_cmd = "git checkout dev; git pull origin dev; git merge master -X ours; git checkout master"
+    cmd("cd lvgl; " + merge_cmd)    
+    
+    merge_cmd = "git checkout dev --;  git pull origin dev; git merge latest -X ours; git checkout master"
+    cmd("cd docs; " + merge_cmd)    
+    
+    
+def merge_from_dev():
+    merge_cmd = "git checkout master; git merge dev;"
+    cmd("cd lvgl; " + merge_cmd)    
+    
+    merge_cmd = "git checkout latest -- ; git merge dev;"
+    cmd("cd docs; " + merge_cmd)    
+        
+
+def lvgl_update_master_version():
+    global ver_major, ver_minor, ver_patch, ver_str
+    
+    os.chdir("./lvgl")
+
+    cmd("git checkout master")
+    define_set("./lvgl.h", "LVGL_VERSION_MAJOR", ver_major)
+    define_set("./lvgl.h", "LVGL_VERSION_MINOR", ver_minor)
+    define_set("./lvgl.h", "LVGL_VERSION_PATCH", ver_patch)
+    define_set("./lvgl.h", "LVGL_VERSION_INFO", "dev")
+    
+    templ = fnmatch.filter(os.listdir('.'), '*templ*')
+    if templ[0]:    
+        print("Updating version in " + templ[0])
+        cmd("sed -i -r 's/v[0-9]+\.[0-9]+\.[0-9]+.*/"+ ver_str +"/' " + templ[0])
+    
+    
+    cmd("git commit -am 'Update version'")
+    
+    os.chdir("../")
+
+def docs_update_latest_version():
+    global ver_str
+    
+    os.chdir("./docs")
+    cmd("git checkout latest --")
+    cmd("sed -i -r \"s/'v[0-9]+\.[0-9]+\.[0-9]+.*'/\'" + ver_str + "'/\" conf.py")   
+    cmd("git commit -am 'Update version'")
+    cmd("git checkout master --")
+    
+    os.chdir("../")
+        
+        
+def lvgl_update_dev_version():
+    global ver_major, ver_minor, ver_patch, dev_ver_str
+    
+    os.chdir("./lvgl")
+
+    cmd("git checkout dev")
+    define_set("./lvgl.h", "LVGL_VERSION_MAJOR", ver_major)
+    define_set("./lvgl.h", "LVGL_VERSION_MINOR", ver_minor)
+    define_set("./lvgl.h", "LVGL_VERSION_PATCH", ver_patch)
+    define_set("./lvgl.h", "LVGL_VERSION_INFO", "\"dev\"")
+    
+    templ = fnmatch.filter(os.listdir('.'), '*templ*')
+    if templ[0]:    
+        print("Updating version in " + templ[0])
+        cmd("sed -i -r 's/v[0-9]+\.[0-9]+\.[0-9]+.*/"+ dev_ver_str +"/' " + templ[0])
+    
+    
+    cmd("git commit -am 'Update dev version'")
+    cmd("git checkout master")
+    
+    os.chdir("../")
+
+def docs_update_dev_version():
+    global dev_ver_str
+    
+    os.chdir("./docs")
+    cmd("git checkout dev --")
+    cmd("sed -i -r \"s/'v[0-9]+\.[0-9]+\.[0-9]+.*'/\'" + dev_ver_str + "'/\" conf.py")   
+    cmd("git commit -am 'Update dev version'")
+    cmd("git checkout master --")
+    
+    os.chdir("../")
 
 
-def lvgl_commit_push(v):
-  title("lvgl: commit and push release")
+def publish_dev_and_master():   
+    pub_cmd = "git checkout dev; git push origin dev"
+    cmd("cd lvgl; " + pub_cmd)    
+    pub_cmd = "git checkout master; git push origin master"
+    cmd("cd lvgl; " + pub_cmd)    
 
-  os.system('git ci -am "Release ' + v + '"')
-  cmd('git tag -a ' + v + ' -m "Release ' + v +'"')
-  cmd('git push origin master')
-  cmd('git push origin ' + v)
+    cmd("cd docs; git checkout master; ./update.py latest dev")
 
+def projs_update():
+    global proj_list, release_br, ver_str
+    for p in proj_list:
+        os.chdir("./" + p)
+        cmd('git checkout master')
+        print(p + ": upadte lvgl");
+        cmd("cd lvgl; git co " + release_br + "; git pull origin " + release_br)
+        cmd("cp -f lvgl/lv_conf_template.h lv_conf.h")
+        cmd("sed -i -r 's/#if 0/#if 1/' lv_conf.h")  # Enable lv_conf.h
+        d = {}
+        with open("confdef.txt") as f:
+            for line in f:
+                (key, val) = line.rstrip().split('\t')
+                d[key] = val
 
-def lvgl_merge_to_release_branch(v):
-  title("lvgl: merge to release branch")
-  cmd('git co release/v7')
-  cmd('git merge master')
-  cmd('git push origin release/v7')
-  os.chdir("../")
-  
-  
-def lvgl_update_api_docs():
-  title("lvgl: Update API with Doxygen")
+        for k,v in d.items():
+            define_set("lv_conf.h", str(k), str(v))        
+            
+        if os.path.exists("lv_examples"): 
+            print(p + ": upadte lv_examples");
+            cmd("cd lv_examples; git co " + release_br + "; git pull origin " + release_br)
+            
+        if os.path.exists("lv_drivers"): 
+            print(p + ": upadte lv_drivers");
+            cmd("cd lv_drivers " + release_br + "; git pull origin " + release_br)
 
-  cmd("cd scripts; doxygen");
+        msg = 'Update to ' + ver_str
+        cmd("git add .")
+        cmd('git commit -am "' + msg +  '"')
+        cmd('git push origin master')
+        cmd("git tag -a " + ver_str + " -m '" + msg + "' " )
+        cmd('git push origin ' + ver_str)
+        
+        os.chdir("../")
+        
 
+def cleanup():
+    os.chdir("../")
+    cmd("rm -fr " + workdir)
 
-def examples_clone():
-  title("examples: Clone")
-  cmd("git clone https://github.com/lvgl/lv_examples.git")
-  os.chdir("./lv_examples")
-  cmd("git co master") 
+if __name__ == '__main__':
+    dev_prepare = 'minor'
+    if(len(sys.argv) != 2):
+        print("Missing argument. Usage ./release.py bugfix | minor | major")
+        print("Use minor by deafult")
+    else:      
+        dev_prepare = sys.argv[1]
+    
+    if not (dev_prepare in prepare_type): 
+        print("Invalid argument. Usage ./release.py bugfix | minor | major") 
+        exit(1)
+        
+    clone_repos()
+    get_lvgl_version("master")
+    lvgl_prepare()
+    lv_examples_prepare() 
+    lv_drivers_prepare()
+    docs_prepare()
+    blog_add_post()
+    add_tags()
+    update_release_branches()
+    publish_master()
+ 
+    if dev_prepare == 'bugfix': 
+        ver_patch = str(int(ver_patch) + 1)
+        ver_str = "v" + ver_major + "." + ver_minor + "." + ver_patch + "-dev"    
 
-def examples_commit_push(v):
-  title("examples: commit and push release")
+        print("Prepare bugfix version " + ver_str)
 
-  os.system('git ci -am "Release ' + v + '"')
-  cmd('git tag -a ' + v + ' -m "Release ' + v +'"')
-  cmd('git push origin master')
-  cmd('git push origin ' + v)
+        lvgl_update_master_version()
+        docs_update_latest_version()
 
+        get_lvgl_version("dev")
+        dev_ver_str = "v" + ver_major + "." + ver_minor + "." + ver_patch + "-dev"
+        merge_to_dev()
+        
+        lvgl_update_dev_version()
+        docs_update_dev_version()
+        publish_dev()
+    else:
+        get_lvgl_version("dev")
+        if dev_prepare == 'minor': 
+            ver_minor = str(int(ver_minor) + 1)
+            ver_patch = "0"
+        else:
+            ver_major = str(int(ver_major) + 1)
+            ver_minor = "0"
+            ver_patch = "0"
+                
+        dev_ver_str = "v" + ver_major + "." + ver_minor + "." + ver_patch + "-dev"
+        
+        print("Prepare minor version " + ver_str)
 
-def examples_merge_to_release_branch(v):
-  title("examples: merge to release branch")
-  cmd('git co release/v7')
-  cmd('git merge master')
-  cmd('git push origin release/v7')
-  os.chdir("../")
-  
-  
-def drivers_clone():
-  title("drivers: Clone")
-  cmd("git clone https://github.com/lvgl/lv_drivers.git")
-  os.chdir("./lv_drivers")
-  cmd("git co master") 
+        merge_to_dev()
+        merge_from_dev()
 
-def drivers_commit_push(v):
-  title("drivers: commit and push release")
-
-  os.system('git ci -am "Release ' + v + '"')
-  cmd('git tag -a ' + v + ' -m "Release ' + v +'"')
-  cmd('git push origin master')
-  cmd('git push origin ' + v)
-
-def drivers_merge_to_release_branch(v):
-  title("drivers: merge to release branch")
-  cmd('git co release/v7')
-  cmd('git merge master')
-  cmd('git push origin release/v7')
-  os.chdir("../")
-
-def docs_clone():
-  title("docs: Clone")
-  #cmd("git clone --recursive https://github.com/lvgl/docs.git")
-  os.chdir("./docs")
-
-def docs_get_api():
-  title("docs: Get API files")
-  
-  cmd("git co latest --") 
-  cmd("rm -rf xml");  
-  cmd("cp -r ../lvgl/docs/api_doc/xml .");  
-  cmd("git add xml");
-  cmd('git commit -m "update API"')  
-
-def docs_update_version(v):
-  title("docs: Update version number")
-
-  f = open("./conf.py", "r")
-      
-  outbuf = ""
-      
-  for i in f.read().splitlines():
-    r = re.search(r'^version = ', i)
-    if r: 
-      i = "version = '" + v + "'"
-
-    r = re.search(r'^release = ', i)
-    if r: 
-      i = "version = '" + v + "'"
-       
-    outbuf += i + '\n'
-   
-  f.close()
-
-  f = open("./conf.py", "w")
-      
-  f.write(outbuf)
-  f.close()
-  cmd("git add conf.py")
-  cmd('git ci -m "update conf.py to ' + v + '"')
-
-def docs_build():
-  title("docs: Build")
-  cmd("git checkout master")
-  cmd("./update.py latest")
-  
-def clean_up():
-  title("Clean up repos")
-  os.chdir("../")
-  cmd("rm -rf lvgl docs lv_examples lv_drivers")
-
-lvgl_clone()
-lvgl_format()
-lvgl_update_api_docs()
-ver_str = lvgl_update_version()    
-lvgl_update_library_json(ver_str)  
-lvgl_update_lv_conf_templ(ver_str)
-lvgl_commit_push(ver_str)
-lvgl_merge_to_release_branch(ver_str)
-
-examples_clone()
-examples_commit_push(ver_str)
-examples_merge_to_release_branch(ver_str)
-
-drivers_clone()
-drivers_commit_push(ver_str)
-drivers_merge_to_release_branch(ver_str)
-
-docs_clone()
-docs_get_api()
-docs_update_version(ver_str)
-docs_build()    
-
-clean_up()
+        lvgl_update_dev_version()
+        docs_update_dev_version()
+        publish_dev_and_master()
+        
+    projs_update()    
+    cleanup()
+    

src/lv_api_map.h

@@ -200,8 +200,31 @@ static inline void lv_chart_set_range(lv_obj_t * chart, lv_coord_t ymin, lv_coor
 {
     lv_chart_set_y_range(chart, LV_CHART_AXIS_PRIMARY_Y, ymin,  ymax);
 }
+
+
+static inline void lv_chart_clear_serie(lv_obj_t * chart, lv_chart_series_t * series)
+{
+    lv_chart_clear_series(chart, series);
+}
+
 #endif
 
+static inline void lv_obj_align_origo(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t x_ofs,
+                                      lv_coord_t y_ofs)
+{
+    lv_obj_align_mid(obj, base, align, x_ofs, y_ofs);
+}
+
+static inline void lv_obj_align_origo_x(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t x_ofs)
+{
+    lv_obj_align_mid_y(obj, base, align, x_ofs);
+}
+
+static inline void lv_obj_align_origo_y(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t y_ofs)
+{
+    lv_obj_align_mid_y(obj, base, align, y_ofs);
+}
+
 #endif /*LV_USE_API_EXTENSION_V6*/
 /**********************
  *      MACROS

src/lv_conf_internal.h

@@ -147,6 +147,12 @@
 #endif
 #endif     /*LV_MEM_CUSTOM*/
 
+/* Use the standard memcpy and memset instead of LVGL's own functions.
+ * The standard functions might or might not be faster depending on their implementation. */
+#ifndef LV_MEMCPY_MEMSET_STD
+#define LV_MEMCPY_MEMSET_STD    0
+#endif
+
 /* Garbage Collector settings
  * Used if lvgl is binded to higher level language and the memory is managed by that language */
 #ifndef LV_ENABLE_GC
@@ -223,7 +229,7 @@
 
 #endif
 
-/* 1: Enable shadow drawing*/
+/* 1: Enable shadow drawing on rectangles*/
 #ifndef LV_USE_SHADOW
 #define LV_USE_SHADOW           1
 #endif
@@ -237,6 +243,21 @@
 #endif
 #endif
 
+/*1: enable outline drawing on rectangles*/
+#ifndef LV_USE_OUTLINE
+#define LV_USE_OUTLINE  1
+#endif
+
+/*1: enable pattern drawing on rectangles*/
+#ifndef LV_USE_PATTERN
+#define LV_USE_PATTERN  1
+#endif
+
+/*1: enable value string drawing on rectangles*/
+#ifndef LV_USE_VALUE_STR
+#define LV_USE_VALUE_STR    1
+#endif
+
 /* 1: Use other blend modes than normal (`LV_BLEND_MODE_...`)*/
 #ifndef LV_USE_BLEND_MODES
 #define LV_USE_BLEND_MODES      1
@@ -589,6 +610,18 @@ e.g. "stm32f769xx.h" or "stm32f429xx.h" */
 #define LV_FONT_FMT_TXT_LARGE   0
 #endif
 
+/* Enables/disables support for compressed fonts. If it's disabled, compressed
+ * glyphs cannot be processed by the library and won't be rendered.
+ */
+#ifndef LV_USE_FONT_COMPRESSED
+#define LV_USE_FONT_COMPRESSED 1
+#endif
+
+/* Enable subpixel rendering */
+#ifndef LV_USE_FONT_SUBPX
+#define LV_USE_FONT_SUBPX 1
+#endif
+#if LV_USE_FONT_SUBPX
 /* Set the pixel order of the display.
  * Important only if "subpx fonts" are used.
  * With "normal" font it doesn't matter.
@@ -596,6 +629,7 @@ e.g. "stm32f769xx.h" or "stm32f429xx.h" */
 #ifndef LV_FONT_SUBPX_BGR
 #define LV_FONT_SUBPX_BGR    0
 #endif
+#endif
 
 /*Declare the type of the user data of fonts (can be e.g. `void *`, `int`, `struct`)*/
 
@@ -620,7 +654,10 @@ e.g. "stm32f769xx.h" or "stm32f429xx.h" */
 /* A fast and impressive theme.
  * Flags:
  * LV_THEME_MATERIAL_FLAG_LIGHT: light theme
- * LV_THEME_MATERIAL_FLAG_DARK: dark theme*/
+ * LV_THEME_MATERIAL_FLAG_DARK: dark theme
+ * LV_THEME_MATERIAL_FLAG_NO_TRANSITION: disable transitions (state change animations)
+ * LV_THEME_MATERIAL_FLAG_NO_FOCUS: disable indication of focused state)
+ * */
 #ifndef LV_USE_THEME_MATERIAL
  #define LV_USE_THEME_MATERIAL    1
 #endif
@@ -1010,6 +1047,11 @@ e.g. "stm32f769xx.h" or "stm32f429xx.h" */
 #endif
 #endif
 
+/*Rotary (dependencies: lv_arc, lv_btn)*/
+#ifndef LV_USE_ROTARY
+#define LV_USE_ROTARY     1
+#endif
+
 /*Slider (dependencies: lv_bar)*/
 #ifndef LV_USE_SLIDER
 #define LV_USE_SLIDER    1

src/lv_core/lv_disp.h

@@ -209,7 +209,7 @@ static inline void lv_scr_load(lv_obj_t * scr)
  * 1 dip is 2 px on a 320 DPI screen
  * https://stackoverflow.com/questions/2025282/what-is-the-difference-between-px-dip-dp-and-sp
  */
-#define LV_DPX(n)   LV_MATH_MAX((( lv_disp_get_dpi(NULL) * (n) + 80) / 160), 1) /*+80 for rounding*/
+#define LV_DPX(n)   (n == 0 ? 0 :LV_MATH_MAX((( lv_disp_get_dpi(NULL) * (n) + 80) / 160), 1)) /*+80 for rounding*/
 
 static inline lv_coord_t lv_dpx(lv_coord_t n)
 {

src/lv_core/lv_indev.c

@@ -1490,7 +1490,6 @@ static lv_obj_t * get_dragged_obj(lv_obj_t * obj)
 static void indev_gesture(lv_indev_proc_t * proc)
 {
 
-    if(proc->types.pointer.drag_in_prog) return;
     if(proc->types.pointer.gesture_sent) return;
 
     lv_obj_t * gesture_obj = proc->types.pointer.act_obj;

src/lv_core/lv_obj.c

@@ -87,8 +87,8 @@ static void refresh_children_style(lv_obj_t * obj);
 static void base_dir_refr_children(lv_obj_t * obj);
 static void obj_align_core(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, bool x_set, bool y_set,
                            lv_coord_t x_ofs, lv_coord_t y_ofs);
-static void obj_align_origo_core(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align,  bool x_set, bool y_set,
-                                 lv_coord_t x_ofs, lv_coord_t y_ofs);
+static void obj_align_mid_core(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align,  bool x_set, bool y_set,
+                               lv_coord_t x_ofs, lv_coord_t y_ofs);
 #if LV_USE_ANIMATION
 static lv_style_trans_t * trans_create(lv_obj_t * obj, lv_style_property_t prop, uint8_t part, lv_state_t prev_state,
                                        lv_state_t new_state);
@@ -103,7 +103,9 @@ static void lv_event_mark_deleted(lv_obj_t * obj);
 static bool obj_valid_child(const lv_obj_t * parent, const lv_obj_t * obj_to_find);
 static void lv_obj_del_async_cb(void * obj);
 static void obj_del_core(lv_obj_t * obj);
-
+static void update_style_cache(lv_obj_t * obj, uint8_t part, uint16_t prop);
+static void update_style_cache_children(lv_obj_t * obj);
+static void invalidate_style_cache(lv_obj_t * obj, uint8_t part, lv_style_property_t prop);
 /**********************
  *  STATIC VARIABLES
  **********************/
@@ -503,43 +505,11 @@ void lv_obj_invalidate_area(const lv_obj_t * obj, const lv_area_t * area)
 {
     LV_ASSERT_OBJ(obj, LV_OBJX_NAME);
 
-    if(lv_obj_get_hidden(obj)) return;
+    lv_area_t area_tmp;
+    lv_area_copy(&area_tmp, area);
+    bool visible = lv_obj_area_is_visible(obj, &area_tmp);
 
-    /*Invalidate the object only if it belongs to the curent or previous'*/
-    lv_obj_t * obj_scr = lv_obj_get_screen(obj);
-    lv_disp_t * disp   = lv_obj_get_disp(obj_scr);
-    if(obj_scr == lv_disp_get_scr_act(disp) ||
-       obj_scr == lv_disp_get_scr_prev(disp) ||
-       obj_scr == lv_disp_get_layer_top(disp) ||
-       obj_scr == lv_disp_get_layer_sys(disp)) {
-
-        /*Truncate the area to the object*/
-        lv_area_t obj_coords;
-        lv_coord_t ext_size = obj->ext_draw_pad;
-        lv_area_copy(&obj_coords, &obj->coords);
-        obj_coords.x1 -= ext_size;
-        obj_coords.y1 -= ext_size;
-        obj_coords.x2 += ext_size;
-        obj_coords.y2 += ext_size;
-
-        bool is_common;
-        lv_area_t area_trunc;
-
-        is_common = _lv_area_intersect(&area_trunc, area, &obj_coords);
-        if(is_common == false) return;  /*The area is not on the object*/
-
-        /*Truncate recursively to the parents*/
-        lv_obj_t * par = lv_obj_get_parent(obj);
-        while(par != NULL) {
-            is_common = _lv_area_intersect(&area_trunc, &area_trunc, &par->coords);
-            if(is_common == false) break;       /*If no common parts with parent break;*/
-            if(lv_obj_get_hidden(par)) return; /*If the parent is hidden then the child is hidden and won't be drawn*/
-
-            par = lv_obj_get_parent(par);
-        }
-
-        if(is_common) _lv_inv_area(disp, &area_trunc);
-    }
+    if(visible) _lv_inv_area(lv_obj_get_disp(obj), &area_tmp);
 }
 
 /**
@@ -562,6 +532,74 @@ void lv_obj_invalidate(const lv_obj_t * obj)
     lv_obj_invalidate_area(obj, &obj_coords);
 
 }
+
+/**
+ * Tell whether an area of an object is visible (even partially) now or not
+ * @param obj pointer to an object
+ * @param area the are to check. The visible part of the area will be written back here.
+ * @return true: visible; false: not visible (hidden, out of parent, on other screen, etc)
+ */
+bool lv_obj_area_is_visible(const lv_obj_t * obj, lv_area_t * area)
+{
+    if(lv_obj_get_hidden(obj)) return false;
+
+    /*Invalidate the object only if it belongs to the curent or previous'*/
+    lv_obj_t * obj_scr = lv_obj_get_screen(obj);
+    lv_disp_t * disp   = lv_obj_get_disp(obj_scr);
+    if(obj_scr == lv_disp_get_scr_act(disp) ||
+       obj_scr == lv_disp_get_scr_prev(disp) ||
+       obj_scr == lv_disp_get_layer_top(disp) ||
+       obj_scr == lv_disp_get_layer_sys(disp)) {
+
+        /*Truncate the area to the object*/
+        lv_area_t obj_coords;
+        lv_coord_t ext_size = obj->ext_draw_pad;
+        lv_area_copy(&obj_coords, &obj->coords);
+        obj_coords.x1 -= ext_size;
+        obj_coords.y1 -= ext_size;
+        obj_coords.x2 += ext_size;
+        obj_coords.y2 += ext_size;
+
+        bool is_common;
+
+        is_common = _lv_area_intersect(area, area, &obj_coords);
+        if(is_common == false) return false;  /*The area is not on the object*/
+
+        /*Truncate recursively to the parents*/
+        lv_obj_t * par = lv_obj_get_parent(obj);
+        while(par != NULL) {
+            is_common = _lv_area_intersect(area, area, &par->coords);
+            if(is_common == false) return false;       /*If no common parts with parent break;*/
+            if(lv_obj_get_hidden(par)) return false; /*If the parent is hidden then the child is hidden and won't be drawn*/
+
+            par = lv_obj_get_parent(par);
+        }
+    }
+
+    return true;
+}
+
+/**
+ * Tell whether an object is visible (even partially) now or not
+ * @param obj pointer to an object
+ * @return true: visible; false: not visible (hidden, out of parent, on other screen, etc)
+ */
+bool lv_obj_is_visible(const lv_obj_t * obj)
+{
+    LV_ASSERT_OBJ(obj, LV_OBJX_NAME);
+
+    lv_area_t obj_coords;
+    lv_coord_t ext_size = obj->ext_draw_pad;
+    lv_area_copy(&obj_coords, &obj->coords);
+    obj_coords.x1 -= ext_size;
+    obj_coords.y1 -= ext_size;
+    obj_coords.x2 += ext_size;
+    obj_coords.y2 += ext_size;
+
+    return lv_obj_area_is_visible(obj, &obj_coords);
+
+}
+
 /*=====================
  * Setter functions
  *====================*/
@@ -856,7 +894,7 @@ void lv_obj_set_height_fit(lv_obj_t * obj, lv_coord_t h)
     lv_style_int_t ptop = lv_obj_get_style_pad_top(obj, LV_OBJ_PART_MAIN);
     lv_style_int_t pbottom = lv_obj_get_style_pad_bottom(obj, LV_OBJ_PART_MAIN);
 
-    lv_obj_set_width(obj, h - ptop - pbottom);
+    lv_obj_set_height(obj, h - ptop - pbottom);
 }
 
 /**
@@ -911,7 +949,7 @@ void lv_obj_align(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_co
     obj->realign.xofs        = x_ofs;
     obj->realign.yofs        = y_ofs;
     obj->realign.base        = base;
-    obj->realign.origo_align = 0;
+    obj->realign.mid_align = 0;
 #endif
 }
 
@@ -959,7 +997,7 @@ void lv_obj_align_y(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_
  * @param x_ofs x coordinate offset after alignment
  * @param y_ofs y coordinate offset after alignment
  */
-void lv_obj_align_origo(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t x_ofs, lv_coord_t y_ofs)
+void lv_obj_align_mid(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t x_ofs, lv_coord_t y_ofs)
 {
     LV_ASSERT_OBJ(obj, LV_OBJX_NAME);
 
@@ -970,7 +1008,7 @@ void lv_obj_align_origo(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align,
     LV_ASSERT_OBJ(base, LV_OBJX_NAME);
 
 
-    obj_align_origo_core(obj, base, align, true, true, x_ofs, y_ofs);
+    obj_align_mid_core(obj, base, align, true, true, x_ofs, y_ofs);
 
 #if LV_USE_OBJ_REALIGN
     /*Save the last align parameters to use them in `lv_obj_realign`*/
@@ -978,7 +1016,7 @@ void lv_obj_align_origo(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align,
     obj->realign.xofs        = x_ofs;
     obj->realign.yofs        = y_ofs;
     obj->realign.base        = base;
-    obj->realign.origo_align = 1;
+    obj->realign.mid_align = 1;
 #endif
 }
 
@@ -989,7 +1027,7 @@ void lv_obj_align_origo(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align,
  * @param align type of alignment (see 'lv_align_t' enum)
  * @param x_ofs x coordinate offset after alignment
  */
-void lv_obj_align_origo_x(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t x_ofs)
+void lv_obj_align_mid_x(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t x_ofs)
 {
     LV_ASSERT_OBJ(obj, LV_OBJX_NAME);
 
@@ -1000,7 +1038,7 @@ void lv_obj_align_origo_x(lv_obj_t * obj, const lv_obj_t * base, lv_align_t alig
     LV_ASSERT_OBJ(base, LV_OBJX_NAME);
 
 
-    obj_align_origo_core(obj, base, align, true, false, x_ofs, 0);
+    obj_align_mid_core(obj, base, align, true, false, x_ofs, 0);
 }
 
 
@@ -1011,7 +1049,7 @@ void lv_obj_align_origo_x(lv_obj_t * obj, const lv_obj_t * base, lv_align_t alig
  * @param align type of alignment (see 'lv_align_t' enum)
  * @param y_ofs y coordinate offset after alignment
  */
-void lv_obj_align_origo_y(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t y_ofs)
+void lv_obj_align_mid_y(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t y_ofs)
 {
     LV_ASSERT_OBJ(obj, LV_OBJX_NAME);
 
@@ -1022,7 +1060,7 @@ void lv_obj_align_origo_y(lv_obj_t * obj, const lv_obj_t * base, lv_align_t alig
     LV_ASSERT_OBJ(base, LV_OBJX_NAME);
 
 
-    obj_align_origo_core(obj, base, align, true, false, 0, y_ofs);
+    obj_align_mid_core(obj, base, align, true, false, 0, y_ofs);
 }
 
 /**
@@ -1034,8 +1072,8 @@ void lv_obj_realign(lv_obj_t * obj)
     LV_ASSERT_OBJ(obj, LV_OBJX_NAME);
 
 #if LV_USE_OBJ_REALIGN
-    if(obj->realign.origo_align)
-        lv_obj_align_origo(obj, obj->realign.base, obj->realign.align, obj->realign.xofs, obj->realign.yofs);
+    if(obj->realign.mid_align)
+        lv_obj_align_mid(obj, obj->realign.base, obj->realign.align, obj->realign.xofs, obj->realign.yofs);
     else
         lv_obj_align(obj, obj->realign.base, obj->realign.align, obj->realign.xofs, obj->realign.yofs);
 #else
@@ -1120,7 +1158,7 @@ void lv_obj_add_style(lv_obj_t * obj, uint8_t part, lv_style_t * style)
 #if LV_USE_ANIMATION
     trans_del(obj, part, 0xFF, NULL);
 #endif
-    lv_obj_refresh_style(obj, LV_STYLE_PROP_ALL);
+    lv_obj_refresh_style(obj, part, LV_STYLE_PROP_ALL);
 }
 
 /**
@@ -1144,7 +1182,7 @@ void lv_obj_remove_style(lv_obj_t * obj, uint8_t part, lv_style_t * style)
 #if LV_USE_ANIMATION
     trans_del(obj, part, 0xFF, NULL);
 #endif
-    lv_obj_refresh_style(obj, LV_STYLE_PROP_ALL);
+    lv_obj_refresh_style(obj, part, LV_STYLE_PROP_ALL);
 }
 
 /**
@@ -1181,7 +1219,7 @@ void lv_obj_reset_style_list(lv_obj_t * obj, uint8_t part)
 {
     lv_obj_clean_style_list(obj, part);
 
-    lv_obj_refresh_style(obj, LV_STYLE_PROP_ALL);
+    lv_obj_refresh_style(obj, part, LV_STYLE_PROP_ALL);
 }
 
 /**
@@ -1203,7 +1241,7 @@ void _lv_obj_set_style_local_int(lv_obj_t * obj, uint8_t part, lv_style_property
 #if LV_USE_ANIMATION
     trans_del(obj, part, prop, NULL);
 #endif
-    lv_obj_refresh_style(obj, prop & (~LV_STYLE_STATE_MASK));
+    lv_obj_refresh_style(obj, part, prop & (~LV_STYLE_STATE_MASK));
 }
 
 /**
@@ -1225,7 +1263,7 @@ void _lv_obj_set_style_local_color(lv_obj_t * obj, uint8_t part, lv_style_proper
 #if LV_USE_ANIMATION
     trans_del(obj, part, prop, NULL);
 #endif
-    lv_obj_refresh_style(obj, prop & (~LV_STYLE_STATE_MASK));
+    lv_obj_refresh_style(obj, part, prop & (~LV_STYLE_STATE_MASK));
 }
 
 /**
@@ -1247,7 +1285,7 @@ void _lv_obj_set_style_local_opa(lv_obj_t * obj, uint8_t part, lv_style_property
 #if LV_USE_ANIMATION
     trans_del(obj, part, prop, NULL);
 #endif
-    lv_obj_refresh_style(obj, prop & (~LV_STYLE_STATE_MASK));
+    lv_obj_refresh_style(obj, part, prop & (~LV_STYLE_STATE_MASK));
 }
 
 /**
@@ -1269,7 +1307,7 @@ void _lv_obj_set_style_local_ptr(lv_obj_t * obj, uint8_t part, lv_style_property
 #if LV_USE_ANIMATION
     trans_del(obj, part, prop, NULL);
 #endif
-    lv_obj_refresh_style(obj, prop & (~LV_STYLE_STATE_MASK));
+    lv_obj_refresh_style(obj, part, prop & (~LV_STYLE_STATE_MASK));
 }
 
 /**
@@ -1294,12 +1332,15 @@ bool lv_obj_remove_style_local_prop(lv_obj_t * obj, uint8_t part, lv_style_prope
 /**
  * Notify an object (and its children) about its style is modified
  * @param obj pointer to an object
+ * @param part the part of the object which style property should be refreshed.
  * @param prop `LV_STYLE_PROP_ALL` or an `LV_STYLE_...` property. It is used to optimize what needs to be refreshed.
  */
-void lv_obj_refresh_style(lv_obj_t * obj, lv_style_property_t prop)
+void lv_obj_refresh_style(lv_obj_t * obj, uint8_t part, lv_style_property_t prop)
 {
     LV_ASSERT_OBJ(obj, LV_OBJX_NAME);
 
+    invalidate_style_cache(obj, part, prop);
+
     /*If a real style refresh is required*/
     bool real_refr = false;
     switch(prop) {
@@ -1387,6 +1428,26 @@ void lv_obj_report_style_mod(lv_style_t * style)
     }
 }
 
+/**
+ * Enable/disable the use of style cahche for an object
+ * @param obj pointer to an object
+ * @param dis true: disable; false: enable (re-enable)
+ */
+void _lv_obj_disable_style_caching(lv_obj_t * obj, bool dis)
+{
+    uint8_t part;
+    for(part = 0; part < _LV_OBJ_PART_REAL_FIRST; part++) {
+        lv_style_list_t * list = lv_obj_get_style_list(obj, part);
+        if(list == NULL) break;
+        list->ignore_cache = dis;
+    }
+    for(part = _LV_OBJ_PART_REAL_FIRST; part < 0xFF; part++) {
+        lv_style_list_t * list = lv_obj_get_style_list(obj, part);
+        if(list == NULL) break;
+        list->ignore_cache = dis;
+    }
+}
+
 /*-----------------
  * Attribute set
  *----------------*/
@@ -1609,7 +1670,7 @@ void lv_obj_set_state(lv_obj_t * obj, lv_state_t new_state)
 
 #if LV_USE_ANIMATION == 0
     obj->state = new_state;
-    lv_obj_refresh_style(obj, LV_STYLE_PROP_ALL);
+    lv_obj_refresh_style(obj, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
 #else
     lv_state_t prev_state = obj->state;
     obj->state = new_state;
@@ -1660,10 +1721,10 @@ void lv_obj_set_state(lv_obj_t * obj, lv_state_t new_state)
 
             }
         }
+        lv_obj_refresh_style(obj, part, LV_STYLE_PROP_ALL);
     }
 #endif
 
-    lv_obj_refresh_style(obj, LV_STYLE_PROP_ALL);
 
 }
 
@@ -1753,6 +1814,52 @@ lv_res_t lv_event_send(lv_obj_t * obj, lv_event_t event, const void * data)
     return res;
 }
 
+/**
+ * Send LV_EVENT_REFRESH event to an object
+ * @param obj point to an obejct. (Can NOT be NULL)
+ * @return LV_RES_OK: success, LV_RES_INV: to object become invalid (e.g. deleted) due to this event.
+ */
+lv_res_t lv_event_send_refresh(lv_obj_t * obj)
+{
+    return lv_event_send(obj, LV_EVENT_REFRESH, NULL);
+}
+
+/**
+ * Send LV_EVENT_REFRESH event to an object and all of its children.
+ * @param obj pointer to an object or NULL to refresh all objects of all displays
+ */
+void lv_event_send_refresh_recursive(lv_obj_t * obj)
+{
+    if(obj == NULL) {
+        /*If no obj specified refresh all screen of all displays */
+        lv_disp_t * d = lv_disp_get_next(NULL);
+        while(d) {
+            lv_obj_t * scr = _lv_ll_get_head(&d->scr_ll);
+            while(scr) {
+                lv_event_send_refresh_recursive(scr);
+                scr = _lv_ll_get_next(&d->scr_ll, scr);
+            }
+            lv_event_send_refresh_recursive(d->top_layer);
+            lv_event_send_refresh_recursive(d->sys_layer);
+
+            d = lv_disp_get_next(d);
+        }
+    }
+    else {
+
+        lv_res_t res = lv_event_send_refresh(obj);
+        if(res != LV_RES_OK) return; /*If invalid returned do not check the children*/
+
+        lv_obj_t * child = lv_obj_get_child(obj, NULL);
+        while(child) {
+            lv_event_send_refresh_recursive(child);
+
+            child = lv_obj_get_child(obj, child);
+        }
+    }
+}
+
+
 /**
  * Call an event function with an object, event, and data.
  * @param event_xcb an event callback function. If `NULL` `LV_RES_OK` will return without any actions.
@@ -2403,12 +2510,74 @@ lv_style_int_t _lv_obj_get_style_int(const lv_obj_t * obj, uint8_t part, lv_styl
     lv_res_t res = LV_RES_INV;
     const lv_obj_t * parent = obj;
     while(parent) {
-        lv_style_list_t * dsc = lv_obj_get_style_list(parent, part);
+        lv_style_list_t * list = lv_obj_get_style_list(parent, part);
+        if(!list->ignore_cache && list->style_cnt > 0) {
+            if(!list->valid_cache) update_style_cache((lv_obj_t *)parent, part, prop  & (~LV_STYLE_STATE_MASK));
+
+            bool def = false;
+            switch(prop  & (~LV_STYLE_STATE_MASK)) {
+                case LV_STYLE_BG_GRAD_DIR:
+                    if(list->bg_grad_dir_none) def = true;
+                    break;
+                case LV_STYLE_CLIP_CORNER:
+                    if(list->clip_corner_off) def = true;
+                    break;
+                case LV_STYLE_TEXT_LETTER_SPACE:
+                case LV_STYLE_TEXT_LINE_SPACE:
+                    if(list->text_space_zero) def = true;
+                    break;
+                case LV_STYLE_TRANSFORM_ANGLE:
+                case LV_STYLE_TRANSFORM_WIDTH:
+                case LV_STYLE_TRANSFORM_HEIGHT:
+                case LV_STYLE_TRANSFORM_ZOOM:
+                    if(list->transform_all_zero) def = true;
+                    break;
+                case LV_STYLE_BORDER_WIDTH:
+                    if(list->border_width_zero) def = true;
+                    break;
+                case LV_STYLE_BORDER_SIDE:
+                    if(list->border_side_full) def = true;
+                    break;
+                case LV_STYLE_BORDER_POST:
+                    if(list->border_post_off) def = true;
+                    break;
+                case LV_STYLE_OUTLINE_WIDTH:
+                    if(list->outline_width_zero) def = true;
+                    break;
+                case LV_STYLE_RADIUS:
+                    if(list->radius_zero) def = true;
+                    break;
+                case LV_STYLE_SHADOW_WIDTH:
+                    if(list->shadow_width_zero) def = true;
+                    break;
+                case LV_STYLE_PAD_TOP:
+                case LV_STYLE_PAD_BOTTOM:
+                case LV_STYLE_PAD_LEFT:
+                case LV_STYLE_PAD_RIGHT:
+                    if(list->pad_all_zero) def = true;
+                    break;
+                case LV_STYLE_BG_BLEND_MODE:
+                case LV_STYLE_BORDER_BLEND_MODE:
+                case LV_STYLE_IMAGE_BLEND_MODE:
+                case LV_STYLE_LINE_BLEND_MODE:
+                case LV_STYLE_OUTLINE_BLEND_MODE:
+                case LV_STYLE_PATTERN_BLEND_MODE:
+                case LV_STYLE_SHADOW_BLEND_MODE:
+                case LV_STYLE_TEXT_BLEND_MODE:
+                case LV_STYLE_VALUE_BLEND_MODE:
+                    if(list->blend_mode_all_normal) def = true;
+                    break;
+            }
+
+            if(def) {
+                break;
+            }
+        }
 
         lv_state_t state = lv_obj_get_state(parent, part);
         prop = (uint16_t)prop_ori + ((uint16_t)state << LV_STYLE_STATE_POS);
 
-        res = _lv_style_list_get_int(dsc, prop, &value_act);
+        res = _lv_style_list_get_int(list, prop, &value_act);
         if(res == LV_RES_OK) return value_act;
 
         if(LV_STYLE_ATTR_GET_INHERIT(attr) == 0) break;
@@ -2466,12 +2635,12 @@ lv_color_t _lv_obj_get_style_color(const lv_obj_t * obj, uint8_t part, lv_style_
     lv_res_t res = LV_RES_INV;
     const lv_obj_t * parent = obj;
     while(parent) {
-        lv_style_list_t * dsc = lv_obj_get_style_list(parent, part);
+        lv_style_list_t * list = lv_obj_get_style_list(parent, part);
 
         lv_state_t state = lv_obj_get_state(parent, part);
         prop = (uint16_t)prop_ori + ((uint16_t)state << LV_STYLE_STATE_POS);
 
-        res = _lv_style_list_get_color(dsc, prop, &value_act);
+        res = _lv_style_list_get_color(list, prop, &value_act);
         if(res == LV_RES_OK) return value_act;
 
         if(LV_STYLE_ATTR_GET_INHERIT(attr) == 0) break;
@@ -2522,12 +2691,34 @@ lv_opa_t _lv_obj_get_style_opa(const lv_obj_t * obj, uint8_t part, lv_style_prop
     lv_res_t res = LV_RES_INV;
     const lv_obj_t * parent = obj;
     while(parent) {
-        lv_style_list_t * dsc = lv_obj_get_style_list(parent, part);
+        lv_style_list_t * list = lv_obj_get_style_list(parent, part);
+
+        if(!list->ignore_cache && list->style_cnt > 0) {
+            if(!list->valid_cache) update_style_cache((lv_obj_t *)parent, part, prop  & (~LV_STYLE_STATE_MASK));
+            bool def = false;
+            switch(prop & (~LV_STYLE_STATE_MASK)) {
+                case LV_STYLE_OPA_SCALE:
+                    if(list->opa_scale_cover) def = true;
+                    break;
+                case LV_STYLE_BG_OPA:
+                    if(list->bg_opa_cover) return LV_OPA_COVER;     /*Special case, not the default value is used*/
+                    if(list->bg_opa_transp) def = true;
+                    break;
+                case LV_STYLE_IMAGE_RECOLOR_OPA:
+                    if(list->img_recolor_opa_transp) def = true;
+                    break;
+            }
+
+            if(def) {
+                break;
+            }
+        }
+
 
         lv_state_t state = lv_obj_get_state(parent, part);
         prop = (uint16_t)prop_ori + ((uint16_t)state << LV_STYLE_STATE_POS);
 
-        res = _lv_style_list_get_opa(dsc, prop, &value_act);
+        res = _lv_style_list_get_opa(list, prop, &value_act);
         if(res == LV_RES_OK) return value_act;
 
         if(LV_STYLE_ATTR_GET_INHERIT(attr) == 0) break;
@@ -2579,12 +2770,32 @@ const void * _lv_obj_get_style_ptr(const lv_obj_t * obj, uint8_t part, lv_style_
     lv_res_t res = LV_RES_INV;
     const lv_obj_t * parent = obj;
     while(parent) {
-        lv_style_list_t * dsc = lv_obj_get_style_list(parent, part);
+        lv_style_list_t * list = lv_obj_get_style_list(parent, part);
+
+        if(!list->ignore_cache && list->style_cnt > 0) {
+            if(!list->valid_cache) update_style_cache((lv_obj_t *)parent, part, prop  & (~LV_STYLE_STATE_MASK));
+            bool def = false;
+            switch(prop  & (~LV_STYLE_STATE_MASK)) {
+                case LV_STYLE_VALUE_STR:
+                    if(list->value_txt_str) def = true;
+                    break;
+                case LV_STYLE_PATTERN_IMAGE:
+                    if(list->pattern_img_null) def = true;
+                    break;
+                case LV_STYLE_TEXT_FONT:
+                    if(list->text_font_normal) def = true;
+                    break;
+            }
+
+            if(def) {
+                break;
+            }
+        }
 
         lv_state_t state = lv_obj_get_state(parent, part);
         prop = (uint16_t)prop_ori + ((uint16_t)state << LV_STYLE_STATE_POS);
 
-        res = _lv_style_list_get_ptr(dsc, prop, &value_act);
+        res = _lv_style_list_get_ptr(list, prop, &value_act);
         if(res == LV_RES_OK)  return value_act;
 
         if(LV_STYLE_ATTR_GET_INHERIT(attr) == 0) break;
@@ -3098,9 +3309,9 @@ void lv_obj_init_draw_rect_dsc(lv_obj_t * obj, uint8_t part, lv_draw_rect_dsc_t
         }
     }
 
-    if(draw_dsc->border_opa != LV_OPA_TRANSP) {
-        draw_dsc->border_width = lv_obj_get_style_border_width(obj, part);
-        if(draw_dsc->border_width) {
+    draw_dsc->border_width = lv_obj_get_style_border_width(obj, part);
+    if(draw_dsc->border_width) {
+        if(draw_dsc->border_opa != LV_OPA_TRANSP) {
             draw_dsc->border_opa = lv_obj_get_style_border_opa(obj, part);
             if(draw_dsc->border_opa > LV_OPA_MIN) {
                 draw_dsc->border_side = lv_obj_get_style_border_side(obj, part);
@@ -3112,10 +3323,10 @@ void lv_obj_init_draw_rect_dsc(lv_obj_t * obj, uint8_t part, lv_draw_rect_dsc_t
         }
     }
 
-
-    if(draw_dsc->outline_opa != LV_OPA_TRANSP) {
-        draw_dsc->outline_width = lv_obj_get_style_outline_width(obj, part);
-        if(draw_dsc->outline_width) {
+#if LV_USE_OUTLINE
+    draw_dsc->outline_width = lv_obj_get_style_outline_width(obj, part);
+    if(draw_dsc->outline_width) {
+        if(draw_dsc->outline_opa != LV_OPA_TRANSP) {
             draw_dsc->outline_opa = lv_obj_get_style_outline_opa(obj, part);
             if(draw_dsc->outline_opa > LV_OPA_MIN) {
                 draw_dsc->outline_pad = lv_obj_get_style_outline_pad(obj, part);
@@ -3126,10 +3337,12 @@ void lv_obj_init_draw_rect_dsc(lv_obj_t * obj, uint8_t part, lv_draw_rect_dsc_t
 #endif
         }
     }
+#endif
 
-    if(draw_dsc->pattern_opa != LV_OPA_TRANSP) {
-        draw_dsc->pattern_image = lv_obj_get_style_pattern_image(obj, part);
-        if(draw_dsc->pattern_image) {
+#if LV_USE_PATTERN
+    draw_dsc->pattern_image = lv_obj_get_style_pattern_image(obj, part);
+    if(draw_dsc->pattern_image) {
+        if(draw_dsc->pattern_opa != LV_OPA_TRANSP) {
             draw_dsc->pattern_opa = lv_obj_get_style_pattern_opa(obj, part);
             if(draw_dsc->pattern_opa > LV_OPA_MIN) {
                 draw_dsc->pattern_recolor_opa = lv_obj_get_style_pattern_recolor_opa(obj, part);
@@ -3147,10 +3360,12 @@ void lv_obj_init_draw_rect_dsc(lv_obj_t * obj, uint8_t part, lv_draw_rect_dsc_t
             }
         }
     }
+#endif
+
 #if LV_USE_SHADOW
-    if(draw_dsc->shadow_opa > LV_OPA_MIN) {
-        draw_dsc->shadow_width = lv_obj_get_style_shadow_width(obj, part);
-        if(draw_dsc->shadow_width) {
+    draw_dsc->shadow_width = lv_obj_get_style_shadow_width(obj, part);
+    if(draw_dsc->shadow_width) {
+        if(draw_dsc->shadow_opa > LV_OPA_MIN) {
             draw_dsc->shadow_opa = lv_obj_get_style_shadow_opa(obj, part);
             if(draw_dsc->shadow_opa > LV_OPA_MIN) {
                 draw_dsc->shadow_ofs_x = lv_obj_get_style_shadow_ofs_x(obj, part);
@@ -3165,9 +3380,10 @@ void lv_obj_init_draw_rect_dsc(lv_obj_t * obj, uint8_t part, lv_draw_rect_dsc_t
     }
 #endif
 
-    if(draw_dsc->value_opa > LV_OPA_MIN) {
-        draw_dsc->value_str = lv_obj_get_style_value_str(obj, part);
-        if(draw_dsc->value_str) {
+#if LV_USE_VALUE_STR
+    draw_dsc->value_str = lv_obj_get_style_value_str(obj, part);
+    if(draw_dsc->value_str) {
+        if(draw_dsc->value_opa > LV_OPA_MIN) {
             draw_dsc->value_opa = lv_obj_get_style_value_opa(obj, part);
             if(draw_dsc->value_opa > LV_OPA_MIN) {
                 draw_dsc->value_ofs_x = lv_obj_get_style_value_ofs_x(obj, part);
@@ -3183,6 +3399,7 @@ void lv_obj_init_draw_rect_dsc(lv_obj_t * obj, uint8_t part, lv_draw_rect_dsc_t
             }
         }
     }
+#endif
 
 #if LV_USE_OPA_SCALE
     if(opa_scale < LV_OPA_MAX) {
@@ -3256,6 +3473,9 @@ void lv_obj_init_draw_img_dsc(lv_obj_t * obj, uint8_t part, lv_draw_img_dsc_t *
 
 void lv_obj_init_draw_line_dsc(lv_obj_t * obj, uint8_t part, lv_draw_line_dsc_t * draw_dsc)
 {
+    draw_dsc->width = lv_obj_get_style_line_width(obj, part);
+    if(draw_dsc->width == 0) return;
+
     draw_dsc->opa = lv_obj_get_style_line_opa(obj, part);
     if(draw_dsc->opa <= LV_OPA_MIN)  return;
 
@@ -3267,9 +3487,6 @@ void lv_obj_init_draw_line_dsc(lv_obj_t * obj, uint8_t part, lv_draw_line_dsc_t
     if(draw_dsc->opa <= LV_OPA_MIN)  return;
 #endif
 
-    draw_dsc->width = lv_obj_get_style_line_width(obj, part);
-    if(draw_dsc->width == 0) return;
-
     draw_dsc->color = lv_obj_get_style_line_color(obj, part);
 
     draw_dsc->dash_width = lv_obj_get_style_line_dash_width(obj, part);
@@ -3585,7 +3802,7 @@ static lv_design_res_t lv_obj_design(lv_obj_t * obj, const lv_area_t * clip_area
         lv_draw_rect_dsc_init(&draw_dsc);
         /*If the border is drawn later disable loading its properties*/
         if(lv_obj_get_style_border_post(obj, LV_OBJ_PART_MAIN)) {
-            draw_dsc.border_opa = LV_OPA_TRANSP;
+            draw_dsc.border_post = 1;
         }
 
         lv_obj_init_draw_rect_dsc(obj, LV_OBJ_PART_MAIN, &draw_dsc);
@@ -3624,6 +3841,7 @@ static lv_design_res_t lv_obj_design(lv_obj_t * obj, const lv_area_t * clip_area
             draw_dsc.bg_opa = LV_OPA_TRANSP;
             draw_dsc.pattern_opa = LV_OPA_TRANSP;
             draw_dsc.shadow_opa = LV_OPA_TRANSP;
+            draw_dsc.value_opa = LV_OPA_TRANSP;
             lv_obj_init_draw_rect_dsc(obj, LV_OBJ_PART_MAIN, &draw_dsc);
 
             lv_coord_t w = lv_obj_get_style_transform_width(obj, LV_OBJ_PART_MAIN);
@@ -3764,16 +3982,16 @@ static void refresh_children_position(lv_obj_t * obj, lv_coord_t x_diff, lv_coor
  */
 static void report_style_mod_core(void * style, lv_obj_t * obj)
 {
-    uint8_t part_sub;
-    for(part_sub = 0; part_sub != _LV_OBJ_PART_REAL_LAST; part_sub++) {
-        lv_style_list_t * dsc = lv_obj_get_style_list(obj, part_sub);
-        if(dsc == NULL) break;
+    uint8_t part;
+    for(part = 0; part != _LV_OBJ_PART_REAL_LAST; part++) {
+        lv_style_list_t * list = lv_obj_get_style_list(obj, part);
+        if(list == NULL) break;
 
         uint8_t ci;
-        for(ci = 0; ci < dsc->style_cnt; ci++) {
-            lv_style_t * class = lv_style_list_get_style(dsc, ci);
+        for(ci = 0; ci < list->style_cnt; ci++) {
+            lv_style_t * class = lv_style_list_get_style(list, ci);
             if(class == style || style == NULL) {
-                lv_obj_refresh_style(obj, LV_STYLE_PROP_ALL);
+                lv_obj_refresh_style(obj, part, LV_STYLE_PROP_ALL);
                 break;
             }
         }
@@ -3840,8 +4058,8 @@ static void obj_align_core(lv_obj_t * obj, const lv_obj_t * base, lv_align_t ali
     else if(y_set) lv_obj_set_y(obj, new_pos.y);
 }
 
-static void obj_align_origo_core(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align,  bool x_set, bool y_set,
-                                 lv_coord_t x_ofs, lv_coord_t y_ofs)
+static void obj_align_mid_core(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align,  bool x_set, bool y_set,
+                               lv_coord_t x_ofs, lv_coord_t y_ofs)
 {
     lv_coord_t new_x = lv_obj_get_x(obj);
     lv_coord_t new_y = lv_obj_get_y(obj);
@@ -4154,7 +4372,7 @@ static void trans_anim_cb(lv_style_trans_t * tr, lv_anim_value_t v)
         else x = tr->end_value._ptr;
         _lv_style_set_ptr(style, tr->prop, x);
     }
-    lv_obj_refresh_style(tr->obj, tr->prop);
+    lv_obj_refresh_style(tr->obj, tr->part, tr->prop);
 
 }
 
@@ -4249,3 +4467,202 @@ static bool obj_valid_child(const lv_obj_t * parent, const lv_obj_t * obj_to_fin
 
     return false;
 }
+
+static bool style_prop_is_cacheble(lv_style_property_t prop)
+{
+
+    switch(prop) {
+        case LV_STYLE_PROP_ALL:
+        case LV_STYLE_BG_GRAD_DIR:
+        case LV_STYLE_CLIP_CORNER:
+        case LV_STYLE_TEXT_LETTER_SPACE:
+        case LV_STYLE_TEXT_LINE_SPACE:
+        case LV_STYLE_TEXT_FONT:
+        case LV_STYLE_TRANSFORM_ANGLE:
+        case LV_STYLE_TRANSFORM_WIDTH:
+        case LV_STYLE_TRANSFORM_HEIGHT:
+        case LV_STYLE_TRANSFORM_ZOOM:
+        case LV_STYLE_BORDER_WIDTH:
+        case LV_STYLE_OUTLINE_WIDTH:
+        case LV_STYLE_RADIUS:
+        case LV_STYLE_SHADOW_WIDTH:
+        case LV_STYLE_OPA_SCALE:
+        case LV_STYLE_BG_OPA:
+        case LV_STYLE_BORDER_SIDE:
+        case LV_STYLE_BORDER_POST:
+        case LV_STYLE_IMAGE_RECOLOR_OPA:
+        case LV_STYLE_VALUE_STR:
+        case LV_STYLE_PATTERN_IMAGE:
+        case LV_STYLE_PAD_TOP:
+        case LV_STYLE_PAD_BOTTOM:
+        case LV_STYLE_PAD_LEFT:
+        case LV_STYLE_PAD_RIGHT:
+        case LV_STYLE_BG_BLEND_MODE:
+        case LV_STYLE_BORDER_BLEND_MODE:
+        case LV_STYLE_IMAGE_BLEND_MODE:
+        case LV_STYLE_LINE_BLEND_MODE:
+        case LV_STYLE_OUTLINE_BLEND_MODE:
+        case LV_STYLE_PATTERN_BLEND_MODE:
+        case LV_STYLE_SHADOW_BLEND_MODE:
+        case LV_STYLE_TEXT_BLEND_MODE:
+        case LV_STYLE_VALUE_BLEND_MODE:
+            return true;
+            break;
+        default:
+            return false;
+    }
+}
+
+/**
+ * Update the cache of style list
+ * @param obj pointer to an obejct
+ * @param part the part of the object
+ * @param prop the property which triggered the update
+ */
+static void update_style_cache(lv_obj_t * obj, uint8_t part, uint16_t prop)
+{
+    if(style_prop_is_cacheble(prop) == false) return;
+
+    lv_style_list_t * list = lv_obj_get_style_list(obj, part);
+
+    bool ignore_cache_ori = list->ignore_cache;
+    list->ignore_cache = 1;
+
+#if LV_USE_OPA_SCALE
+    list->opa_scale_cover    = lv_obj_get_style_opa_scale(obj, part) == LV_OPA_COVER ? 1 : 0;
+#else
+    list->opa_scale_cover    = 1;
+#endif
+    list->text_decor_none    = lv_obj_get_style_text_decor(obj, part) == LV_TEXT_DECOR_NONE ? 1 : 0;
+    list->text_font_normal    = lv_obj_get_style_text_font(obj, part) == LV_THEME_DEFAULT_FONT_NORMAL ? 1 : 0;
+
+    list->text_space_zero = 1;
+    if(lv_obj_get_style_text_letter_space(obj, part) != 0 ||
+       lv_obj_get_style_text_line_space(obj, part) != 0) {
+        list->text_space_zero = 0;
+    }
+
+
+    lv_opa_t bg_opa = lv_obj_get_style_bg_opa(obj, part);
+    list->bg_opa_transp    = bg_opa == LV_OPA_TRANSP ? 1 : 0;
+    list->bg_opa_cover     = bg_opa == LV_OPA_COVER ? 1 : 0;
+
+    list->bg_grad_dir_none  = lv_obj_get_style_bg_grad_dir(obj, part) == LV_GRAD_DIR_NONE ? 1 : 0;
+    list->border_width_zero = lv_obj_get_style_border_width(obj, part) == 0 ? 1 : 0;
+    list->border_side_full = lv_obj_get_style_border_side(obj, part) == LV_BORDER_SIDE_FULL ? 1 : 0;
+    list->border_post_off = lv_obj_get_style_border_post(obj, part) == 0 ? 1 : 0;
+    list->clip_corner_off   = lv_obj_get_style_clip_corner(obj, part) == false ? 1 : 0;
+    list->img_recolor_opa_transp    = lv_obj_get_style_image_recolor_opa(obj, part) == LV_OPA_TRANSP ? 1 : 0;
+    list->outline_width_zero    = lv_obj_get_style_outline_width(obj, part) == 0 ? 1 : 0;
+    list->pattern_img_null    = lv_obj_get_style_pattern_image(obj, part) == NULL ? 1 : 0;
+    list->radius_zero    = lv_obj_get_style_radius(obj, part) == 0 ? 1 : 0;
+    list->shadow_width_zero    = lv_obj_get_style_shadow_width(obj, part) == 0 ? 1 : 0;
+    list->value_txt_str    = lv_obj_get_style_value_str(obj, part) == NULL ? 1 : 0;
+
+
+    list->transform_all_zero  = 1;
+    if(lv_obj_get_style_transform_angle(obj, part) != 0 ||
+       lv_obj_get_style_transform_width(obj, part) != 0 ||
+       lv_obj_get_style_transform_height(obj, part) != 0 ||
+       lv_obj_get_style_transform_zoom(obj, part) != LV_IMG_ZOOM_NONE) {
+        list->transform_all_zero  = 0;
+    }
+
+    list->pad_all_zero  = 1;
+    if(lv_obj_get_style_pad_top(obj, part) != 0 ||
+       lv_obj_get_style_pad_bottom(obj, part) != 0 ||
+       lv_obj_get_style_pad_left(obj, part) != 0 ||
+       lv_obj_get_style_pad_right(obj, part) != 0) {
+        list->pad_all_zero  = 0;
+    }
+
+    list->blend_mode_all_normal = 1;
+#if LV_USE_BLEND_MODES
+    if(lv_obj_get_style_bg_blend_mode(obj, part) != LV_BLEND_MODE_NORMAL ||
+       lv_obj_get_style_border_blend_mode(obj, part) != LV_BLEND_MODE_NORMAL ||
+       lv_obj_get_style_pattern_blend_mode(obj, part) != LV_BLEND_MODE_NORMAL ||
+       lv_obj_get_style_outline_blend_mode(obj, part) != LV_BLEND_MODE_NORMAL ||
+       lv_obj_get_style_value_blend_mode(obj, part) != LV_BLEND_MODE_NORMAL ||
+       lv_obj_get_style_text_blend_mode(obj, part) != LV_BLEND_MODE_NORMAL ||
+       lv_obj_get_style_line_blend_mode(obj, part) != LV_BLEND_MODE_NORMAL ||
+       lv_obj_get_style_image_blend_mode(obj, part) != LV_BLEND_MODE_NORMAL ||
+       lv_obj_get_style_shadow_blend_mode(obj, part) != LV_BLEND_MODE_NORMAL) {
+        list->blend_mode_all_normal = 0;
+    }
+#endif
+    list->ignore_cache = ignore_cache_ori;
+    list->valid_cache = 1;
+}
+
+/**
+ * Update the cache of style list
+ * @param obj pointer to an object
+ * @param part the part of the object
+ */
+static void update_style_cache_children(lv_obj_t * obj)
+{
+    uint8_t part;
+    for(part = 0; part != _LV_OBJ_PART_REAL_LAST; part++) {
+        lv_style_list_t * list = lv_obj_get_style_list(obj, part);
+        if(list == NULL) break;
+
+        bool ignore_cache_ori = list->ignore_cache;
+        list->ignore_cache = 1;
+
+        list->opa_scale_cover    = lv_obj_get_style_opa_scale(obj, part) == LV_OPA_COVER ? 1 : 0;
+        list->text_decor_none    = lv_obj_get_style_text_decor(obj, part) == LV_TEXT_DECOR_NONE ? 1 : 0;
+        list->text_font_normal    = lv_obj_get_style_text_font(obj, part) == lv_theme_get_font_normal() ? 1 : 0;
+        list->img_recolor_opa_transp    = lv_obj_get_style_image_recolor_opa(obj, part) == LV_OPA_TRANSP ? 1 : 0;
+
+        list->text_space_zero = 1;
+        if(lv_obj_get_style_text_letter_space(obj, part) != 0 ||
+           lv_obj_get_style_text_line_space(obj, part) != 0) {
+            list->text_space_zero = 0;
+        }
+
+        list->ignore_cache = ignore_cache_ori;
+    }
+
+    lv_obj_t * child = lv_obj_get_child(obj, NULL);
+    while(child) {
+        update_style_cache_children(child);
+        child = lv_obj_get_child(obj, child);
+    }
+
+}
+
+/**
+ * Mark the object and all of it's children's style lists as invalid.
+ * The cache will be updated when a cached property asked nest time
+ * @param obj pointer to an object
+ */
+static void invalidate_style_cache(lv_obj_t * obj, uint8_t part, lv_style_property_t prop)
+{
+    if(style_prop_is_cacheble(prop) == false) return;
+
+    if(part != LV_OBJ_PART_ALL) {
+        lv_style_list_t * list = lv_obj_get_style_list(obj, part);
+        if(list == NULL) return;
+        list->valid_cache = 0;
+    }
+    else {
+
+        for(part = 0; part < _LV_OBJ_PART_REAL_FIRST; part++) {
+            lv_style_list_t * list = lv_obj_get_style_list(obj, part);
+            if(list == NULL) break;
+            list->valid_cache = 0;
+        }
+        for(part = _LV_OBJ_PART_REAL_FIRST; part < 0xFF; part++) {
+            lv_style_list_t * list = lv_obj_get_style_list(obj, part);
+            if(list == NULL) break;
+            list->valid_cache = 0;
+        }
+    }
+
+    lv_obj_t * child = lv_obj_get_child(obj, NULL);
+    while(child) {
+        update_style_cache_children(child);
+        child = lv_obj_get_child(obj, child);
+    }
+}
+

src/lv_core/lv_obj.h

@@ -105,6 +105,7 @@ enum {
     LV_EVENT_APPLY,  /**< "Ok", "Apply" or similar specific button has clicked*/
     LV_EVENT_CANCEL, /**< "Close", "Cancel" or similar specific button has clicked*/
     LV_EVENT_DELETE, /**< Object is being deleted */
+    _LV_EVENT_LAST /** Number of events*/
 };
 typedef uint8_t lv_event_t; /**< Type of event being sent to the object. */
 
@@ -162,7 +163,7 @@ typedef struct {
     lv_coord_t yofs;
     lv_align_t align;
     uint8_t auto_realign : 1;
-    uint8_t origo_align : 1; /**< 1: the origo (center of the object) was aligned with
+    uint8_t mid_align : 1; /**< 1: the origo (center of the object) was aligned with
                                 `lv_obj_align_origo`*/
 } lv_realign_t;
 #endif
@@ -353,6 +354,22 @@ void lv_obj_invalidate_area(const lv_obj_t * obj, const lv_area_t * area);
  */
 void lv_obj_invalidate(const lv_obj_t * obj);
 
+
+/**
+ * Tell whether an area of an object is visible (even partially) now or not
+ * @param obj pointer to an object
+ * @param area the are to check. The visible part of the area will be written back here.
+ * @return true: visible; false: not visible (hidden, out of parent, on other screen, etc)
+ */
+bool lv_obj_area_is_visible(const lv_obj_t * obj, lv_area_t * area);
+
+/**
+ * Tell whether an object is visible (even partially) now or not
+ * @param obj pointer to an object
+ * @return true: visible; false: not visible (hidden, out of parent, on other screen, etc)
+ */
+bool lv_obj_is_visible(const lv_obj_t * obj);
+
 /*=====================
  * Setter functions
  *====================*/
@@ -494,7 +511,7 @@ void lv_obj_align_y(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_
  * @param x_ofs x coordinate offset after alignment
  * @param y_ofs y coordinate offset after alignment
  */
-void lv_obj_align_origo(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t x_ofs, lv_coord_t y_ofs);
+void lv_obj_align_mid(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t x_ofs, lv_coord_t y_ofs);
 
 
 /**
@@ -504,7 +521,7 @@ void lv_obj_align_origo(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align,
  * @param align type of alignment (see 'lv_align_t' enum)
  * @param x_ofs x coordinate offset after alignment
  */
-void lv_obj_align_origo_x(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t x_ofs);
+void lv_obj_align_mid_x(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t x_ofs);
 
 /**
  * Align an object's middle point to an other object vertically.
@@ -513,7 +530,7 @@ void lv_obj_align_origo_x(lv_obj_t * obj, const lv_obj_t * base, lv_align_t alig
  * @param align type of alignment (see 'lv_align_t' enum)
  * @param y_ofs y coordinate offset after alignment
  */
-void lv_obj_align_origo_y(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t y_ofs);
+void lv_obj_align_mid_y(lv_obj_t * obj, const lv_obj_t * base, lv_align_t align, lv_coord_t y_ofs);
 
 /**
  * Realign the object based on the last `lv_obj_align` parameters.
@@ -586,7 +603,7 @@ void lv_obj_reset_style_list(lv_obj_t * obj, uint8_t part);
  * @param obj pointer to an object
  * @param prop `LV_STYLE_PROP_ALL` or an `LV_STYLE_...` property. It is used to optimize what needs to be refreshed.
  */
-void lv_obj_refresh_style(lv_obj_t * obj, lv_style_property_t prop);
+void lv_obj_refresh_style(lv_obj_t * obj, uint8_t part, lv_style_property_t prop);
 
 /**
  * Notify all object if a style is modified
@@ -664,6 +681,13 @@ void _lv_obj_set_style_local_ptr(lv_obj_t * obj, uint8_t type, lv_style_property
  */
 bool lv_obj_remove_style_local_prop(lv_obj_t * obj, uint8_t part, lv_style_property_t prop);
 
+/**
+ * Enable/disable the use of style cahche for an object
+ * @param obj pointer to an object
+ * @param dis true: disable; false: enable (re-enable)
+ */
+void _lv_obj_disable_style_caching(lv_obj_t * obj, bool dis);
+
 /*-----------------
  * Attribute set
  *----------------*/
@@ -823,6 +847,20 @@ void lv_obj_set_event_cb(lv_obj_t * obj, lv_event_cb_t event_cb);
  */
 lv_res_t lv_event_send(lv_obj_t * obj, lv_event_t event, const void * data);
 
+
+/**
+ * Send LV_EVENT_REFRESH event to an object
+ * @param obj point to an obejct. (Can NOT be NULL)
+ * @return LV_RES_OK: success, LV_RES_INV: to object become invalid (e.g. deleted) due to this event.
+ */
+lv_res_t lv_event_send_refresh(lv_obj_t * obj);
+
+/**
+ * Send LV_EVENT_REFRESH event to an object and all of its children
+ * @param obj pointer to an object or NULL to refresh all objects of all displays
+ */
+void lv_event_send_refresh_recursive(lv_obj_t * obj);
+
 /**
  * Call an event function with an object, event, and data.
  * @param event_xcb an event callback function. If `NULL` `LV_RES_OK` will return without any actions.

src/lv_core/lv_refr.c

@@ -572,10 +572,15 @@ static lv_obj_t * lv_refr_get_top_obj(const lv_area_t * area_p, lv_obj_t * obj)
 
     /*If this object is fully cover the draw area check the children too */
     if(_lv_area_is_in(area_p, &obj->coords, 0) && obj->hidden == 0) {
-        lv_design_res_t design_res = obj->design_cb ? obj->design_cb(obj, area_p,
-                                                                     LV_DESIGN_COVER_CHK) : LV_DESIGN_RES_NOT_COVER;
+        lv_design_res_t design_res = obj->design_cb(obj, area_p, LV_DESIGN_COVER_CHK);
         if(design_res == LV_DESIGN_RES_MASKED) return NULL;
 
+#if LV_USE_OPA_SCALE
+        if(design_res == LV_DESIGN_RES_COVER && lv_obj_get_style_opa_scale(obj, LV_OBJ_PART_MAIN) != LV_OPA_COVER) {
+            design_res = LV_DESIGN_RES_NOT_COVER;
+        }
+#endif
+
         lv_obj_t * i;
         _LV_LL_READ(obj->child_ll, i) {
             found_p = lv_refr_get_top_obj(area_p, i);

src/lv_core/lv_style.c

@@ -257,7 +257,7 @@ void _lv_style_list_remove_style(lv_style_list_t * list, lv_style_t * style)
         return;
     }
 
-    lv_style_t ** new_classes = lv_mem_realloc(list->style_list, sizeof(lv_style_t *) * (list->style_cnt - 1));
+    lv_style_t ** new_classes = lv_mem_alloc(sizeof(lv_style_t *) * (list->style_cnt - 1));
     LV_ASSERT_MEM(new_classes);
     if(new_classes == NULL) {
         LV_LOG_WARN("lv_style_list_remove_style: couldn't reallocate class list");
@@ -271,6 +271,8 @@ void _lv_style_list_remove_style(lv_style_list_t * list, lv_style_t * style)
 
     }
 
+    lv_mem_free(list->style_list);
+
     list->style_cnt--;
     list->style_list = new_classes;
 }
@@ -873,7 +875,8 @@ lv_res_t _lv_style_list_get_color(lv_style_list_t * list, lv_style_property_t pr
 
     int16_t weight = -1;
 
-    lv_color_t value_act = { 0 };
+    lv_color_t value_act;
+    value_act.full = 0;
 
     int16_t ci;
     for(ci = 0; ci < list->style_cnt; ci++) {
@@ -1037,7 +1040,6 @@ bool lv_debug_check_style_list(const lv_style_list_t * list)
     return true;
 }
 
-
 /**********************
  *   STATIC FUNCTIONS
  **********************/
@@ -1102,7 +1104,7 @@ static lv_style_t * get_alloc_local_style(lv_style_list_t * list)
 {
     LV_ASSERT_STYLE_LIST(list);
 
-    if(list->has_local) return lv_style_list_get_style(list, 0);
+    if(list->has_local) return lv_style_list_get_style(list, list->has_trans ? 1 : 0);
 
     lv_style_t * local_style = lv_mem_alloc(sizeof(lv_style_t));
     LV_ASSERT_MEM(local_style);

src/lv_core/lv_style.h

@@ -221,11 +221,37 @@ typedef struct {
 #if LV_USE_ASSERT_STYLE
     uint32_t sentinel;
 #endif
-    uint8_t style_cnt;
-    uint8_t has_local    : 1;
-    uint8_t has_trans    : 1;
-    uint8_t skip_trans   : 1;       /*1: Temporally skip the transition style if any*/
-    uint8_t ignore_trans   : 1;     /*1: Mark that this style list shouldn't receive transitions at all*/
+    uint32_t style_cnt     : 6;
+    uint32_t has_local     : 1;
+    uint32_t has_trans     : 1;
+    uint32_t skip_trans    : 1;      /*1: Temporally skip the transition style if any*/
+    uint32_t ignore_trans  : 1;      /*1: Mark that this style list shouldn't receive transitions at all*/
+    uint32_t valid_cache   : 1;      /*1: The cache is valid and can be used*/
+    uint32_t ignore_cache  : 1;      /*1: Ignore cache while getting value of properties*/
+
+    uint32_t radius_zero : 1;
+    uint32_t opa_scale_cover      : 1;
+    uint32_t clip_corner_off       : 1;
+    uint32_t transform_all_zero  : 1;
+    uint32_t pad_all_zero : 1;
+    uint32_t blend_mode_all_normal : 1;
+    uint32_t bg_opa_transp : 1;
+    uint32_t bg_opa_cover : 1;
+    uint32_t bg_grad_dir_none : 1;
+
+    uint32_t border_width_zero : 1;
+    uint32_t border_side_full : 1;
+    uint32_t border_post_off : 1;
+
+    uint32_t outline_width_zero : 1;
+    uint32_t pattern_img_null : 1;
+    uint32_t shadow_width_zero : 1;
+    uint32_t value_txt_str : 1;
+    uint32_t img_recolor_opa_transp : 1;
+
+    uint32_t text_space_zero : 1;
+    uint32_t text_decor_none : 1;
+    uint32_t text_font_normal : 1;
 } lv_style_list_t;
 
 /**********************
@@ -570,7 +596,7 @@ bool lv_debug_check_style_list(const lv_style_list_t * list);
  *     lv_style_init(&my_style);
  *     lv_style_copy(&my_style, &style_to_copy);
  */
-#define LV_STYLE_CREATE(name, copy_p) static lv_style_t name; lv_style_init(&name); lv_style_copy(&name, copy);
+#define LV_STYLE_CREATE(name, copy_p) static lv_style_t name; lv_style_init(&name); lv_style_copy(&name, copy_p);
 
 
 

src/lv_draw/lv_draw_arc.c

@@ -65,17 +65,18 @@ static void get_rounded_area(int16_t angle, lv_coord_t radius, uint8_t tickness,
  * @param mask the arc will be drawn only in this mask
  * @param start_angle the start angle of the arc (0 deg on the bottom, 90 deg on the right)
  * @param end_angle the end angle of the arc
- * @param style style of the arc (`body.thickness`, `body.main_color`, `body.opa` is used)
- * @param opa_scale scale down all opacities by the factor
+ * @param clip_area the arc will be drawn only in this area
+ * @param dsc pointer to an initialized `lv_draw_line_dsc_t` variable
  */
 void lv_draw_arc(lv_coord_t center_x, lv_coord_t center_y, uint16_t radius,  uint16_t start_angle, uint16_t end_angle,
-                 const lv_area_t * clip_area, lv_draw_line_dsc_t * dsc)
+                 const lv_area_t * clip_area, const lv_draw_line_dsc_t * dsc)
 {
     if(dsc->opa <= LV_OPA_MIN) return;
     if(dsc->width == 0) return;
     if(start_angle == end_angle) return;
 
-    if(dsc->width > radius) dsc->width = radius;
+    lv_style_int_t width = dsc->width;
+    if(width > radius) width = radius;
 
     lv_draw_rect_dsc_t cir_dsc;
     lv_draw_rect_dsc_init(&cir_dsc);
@@ -83,7 +84,7 @@ void lv_draw_arc(lv_coord_t center_x, lv_coord_t center_y, uint16_t radius,  uin
     cir_dsc.bg_opa = LV_OPA_TRANSP;
     cir_dsc.border_opa = dsc->opa;
     cir_dsc.border_color = dsc->color;
-    cir_dsc.border_width = dsc->width;
+    cir_dsc.border_width = width;
     cir_dsc.border_blend_mode = dsc->blend_mode;
 
     lv_area_t area;
@@ -123,7 +124,7 @@ void lv_draw_arc(lv_coord_t center_x, lv_coord_t center_y, uint16_t radius,  uin
         q_dsc.end_angle = end_angle;
         q_dsc.start_quarter = (start_angle / 90) & 0x3;
         q_dsc.end_quarter = (end_angle / 90) & 0x3;
-        q_dsc.width = dsc->width;
+        q_dsc.width = width;
         q_dsc.draw_dsc =  &cir_dsc;
         q_dsc.draw_area = &area;
         q_dsc.clip_area = clip_area;
@@ -146,7 +147,7 @@ void lv_draw_arc(lv_coord_t center_x, lv_coord_t center_y, uint16_t radius,  uin
 
         lv_area_t round_area;
         if(dsc->round_start) {
-            get_rounded_area(start_angle, radius, dsc->width, &round_area);
+            get_rounded_area(start_angle, radius, width, &round_area);
             round_area.x1 += center_x;
             round_area.x2 += center_x;
             round_area.y1 += center_y;
@@ -156,7 +157,7 @@ void lv_draw_arc(lv_coord_t center_x, lv_coord_t center_y, uint16_t radius,  uin
         }
 
         if(dsc->round_end) {
-            get_rounded_area(end_angle, radius, dsc->width, &round_area);
+            get_rounded_area(end_angle, radius, width, &round_area);
             round_area.x1 += center_x;
             round_area.x2 += center_x;
             round_area.y1 += center_y;

src/lv_draw/lv_draw_arc.h

@@ -35,11 +35,11 @@ extern "C" {
  * @param mask the arc will be drawn only in this mask
  * @param start_angle the start angle of the arc (0 deg on the bottom, 90 deg on the right)
  * @param end_angle the end angle of the arc
- * @param style style of the arc (`body.thickness`, `body.main_color`, `body.opa` is used)
- * @param opa_scale scale down all opacities by the factor
+ * @param clip_area the arc will be drawn only in this area
+ * @param dsc pointer to an initialized `lv_draw_line_dsc_t` variable
  */
 void lv_draw_arc(lv_coord_t center_x, lv_coord_t center_y, uint16_t radius,  uint16_t start_angle, uint16_t end_angle,
-                 const lv_area_t * clip_area, lv_draw_line_dsc_t * dsc);
+                 const lv_area_t * clip_area, const lv_draw_line_dsc_t * dsc);
 
 /**********************
  *      MACROS

src/lv_draw/lv_draw_blend.c

@@ -36,9 +36,11 @@ LV_ATTRIBUTE_FAST_MEM static void fill_normal(const lv_area_t * disp_area, lv_co
                                               lv_color_t color, lv_opa_t opa,
                                               const lv_opa_t * mask, lv_draw_mask_res_t mask_res);
 
+#if LV_USE_BLEND_MODES
 static void fill_blended(const lv_area_t * disp_area, lv_color_t * disp_buf,  const lv_area_t * draw_area,
                          lv_color_t color, lv_opa_t opa,
                          const lv_opa_t * mask, lv_draw_mask_res_t mask_res, lv_blend_mode_t mode);
+#endif
 
 static void map_set_px(const lv_area_t * disp_area, lv_color_t * disp_buf,  const lv_area_t * draw_area,
                        const lv_area_t * map_area, const lv_color_t * map_buf, lv_opa_t opa,
@@ -49,12 +51,14 @@ LV_ATTRIBUTE_FAST_MEM static void map_normal(const lv_area_t * disp_area, lv_col
                                              const lv_area_t * map_area, const lv_color_t * map_buf, lv_opa_t opa,
                                              const lv_opa_t * mask, lv_draw_mask_res_t mask_res);
 
+#if LV_USE_BLEND_MODES
 static void map_blended(const lv_area_t * disp_area, lv_color_t * disp_buf,  const lv_area_t * draw_area,
                         const lv_area_t * map_area, const lv_color_t * map_buf, lv_opa_t opa,
                         const lv_opa_t * mask, lv_draw_mask_res_t mask_res, lv_blend_mode_t mode);
 
 static inline lv_color_t color_blend_true_color_additive(lv_color_t fg, lv_color_t bg, lv_opa_t opa);
 static inline lv_color_t color_blend_true_color_subtractive(lv_color_t fg, lv_color_t bg, lv_opa_t opa);
+#endif
 
 /**********************
  *  STATIC VARIABLES
@@ -167,9 +171,11 @@ LV_ATTRIBUTE_FAST_MEM void _lv_blend_fill(const lv_area_t * clip_area, const lv_
     else if(mode == LV_BLEND_MODE_NORMAL) {
         fill_normal(disp_area, disp_buf, &draw_area, color, opa, mask, mask_res);
     }
+#if LV_USE_BLEND_MODES
     else {
         fill_blended(disp_area, disp_buf, &draw_area, color, opa, mask, mask_res, mode);
     }
+#endif
 }
 
 /**
@@ -230,9 +236,11 @@ LV_ATTRIBUTE_FAST_MEM void _lv_blend_map(const lv_area_t * clip_area, const lv_a
     else if(mode == LV_BLEND_MODE_NORMAL) {
         map_normal(disp_area, disp_buf, &draw_area, map_area, map_buf, opa, mask, mask_res);
     }
+#if LV_USE_BLEND_MODES
     else {
         map_blended(disp_area, disp_buf, &draw_area, map_area, map_buf, opa, mask, mask_res, mode);
     }
+#endif
 }
 
 
@@ -515,7 +523,7 @@ LV_ATTRIBUTE_FAST_MEM static void fill_normal(const lv_area_t * disp_area, lv_co
     }
 }
 
-
+#if LV_USE_BLEND_MODES
 /**
  * Fill an area with a color but apply blending algorithms
  * @param disp_area the current display area (destination area)
@@ -606,6 +614,7 @@ static void fill_blended(const lv_area_t * disp_area, lv_color_t * disp_buf,  co
         }
     }
 }
+#endif
 
 static void map_set_px(const lv_area_t * disp_area, lv_color_t * disp_buf,  const lv_area_t * draw_area,
                        const lv_area_t * map_area, const lv_color_t * map_buf, lv_opa_t opa,
@@ -845,7 +854,7 @@ LV_ATTRIBUTE_FAST_MEM static void map_normal(const lv_area_t * disp_area, lv_col
         }
     }
 }
-
+#if LV_USE_BLEND_MODES
 static void map_blended(const lv_area_t * disp_area, lv_color_t * disp_buf,  const lv_area_t * draw_area,
                         const lv_area_t * map_area, const lv_color_t * map_buf, lv_opa_t opa,
                         const lv_opa_t * mask, lv_draw_mask_res_t mask_res, lv_blend_mode_t mode)
@@ -996,3 +1005,4 @@ static inline lv_color_t color_blend_true_color_subtractive(lv_color_t fg, lv_co
 
     return lv_color_mix(fg, bg, opa);
 }
+#endif

src/lv_draw/lv_draw_blend.h

@@ -26,8 +26,10 @@ extern "C" {
  **********************/
 enum {
     LV_BLEND_MODE_NORMAL,
+#if LV_USE_BLEND_MODES
     LV_BLEND_MODE_ADDITIVE,
     LV_BLEND_MODE_SUBTRACTIVE,
+#endif
 };
 
 typedef uint8_t lv_blend_mode_t;

src/lv_draw/lv_draw_img.c

@@ -29,11 +29,11 @@
  **********************/
 LV_ATTRIBUTE_FAST_MEM static lv_res_t lv_img_draw_core(const lv_area_t * coords, const lv_area_t * clip_area,
                                                        const void * src,
-                                                       lv_draw_img_dsc_t * draw_dsc);
+                                                       const lv_draw_img_dsc_t * draw_dsc);
 
 LV_ATTRIBUTE_FAST_MEM static void lv_draw_map(const lv_area_t * map_area, const lv_area_t * clip_area,
                                               const uint8_t * map_p,
-                                              lv_draw_img_dsc_t * draw_dsc,
+                                              const lv_draw_img_dsc_t * draw_dsc,
                                               bool chroma_key, bool alpha_byte);
 
 static void show_error(const lv_area_t * coords, const lv_area_t * clip_area, const char * msg);
@@ -65,13 +65,9 @@ void lv_draw_img_dsc_init(lv_draw_img_dsc_t * dsc)
  * @param coords the coordinates of the image
  * @param mask the image will be drawn only in this area
  * @param src pointer to a lv_color_t array which contains the pixels of the image
- * @param style style of the image
- * @param angle rotation angle of the image
- * @param center rotation center of the image
- * @param antialias anti-alias transformations (rotate, zoom) or not
- * @param opa_scale scale down all opacities by the factor
+ * @param dsc pointer to an initialized `lv_draw_img_dsc_t` variable
  */
-void lv_draw_img(const lv_area_t * coords, const lv_area_t * mask, const void * src, lv_draw_img_dsc_t * dsc)
+void lv_draw_img(const lv_area_t * coords, const lv_area_t * mask, const void * src, const lv_draw_img_dsc_t * dsc)
 {
     if(src == NULL) {
         LV_LOG_WARN("Image draw: src is NULL");
@@ -232,7 +228,7 @@ lv_img_src_t lv_img_src_get_type(const void * src)
 
 LV_ATTRIBUTE_FAST_MEM static lv_res_t lv_img_draw_core(const lv_area_t * coords, const lv_area_t * clip_area,
                                                        const void * src,
-                                                       lv_draw_img_dsc_t * draw_dsc)
+                                                       const lv_draw_img_dsc_t * draw_dsc)
 {
     if(draw_dsc->opa <= LV_OPA_MIN) return LV_RES_OK;
 
@@ -327,18 +323,14 @@ LV_ATTRIBUTE_FAST_MEM static lv_res_t lv_img_draw_core(const lv_area_t * coords,
  * @param cords_p coordinates the color map
  * @param mask_p the map will drawn only on this area  (truncated to VDB area)
  * @param map_p pointer to a lv_color_t array
- * @param opa opacity of the map
+ * @param draw_dsc pointer to an initialized `lv_draw_img_dsc_t` variable
  * @param chroma_keyed true: enable transparency of LV_IMG_LV_COLOR_TRANSP color pixels
  * @param alpha_byte true: extra alpha byte is inserted for every pixel
- * @param style style of the image
- * @param angle angle in degree
- * @param pivot center of rotation
- * @param zoom zoom factor
- * @param antialias anti-alias transformations (rotate, zoom) or not
  */
 LV_ATTRIBUTE_FAST_MEM static void lv_draw_map(const lv_area_t * map_area, const lv_area_t * clip_area,
                                               const uint8_t * map_p,
-                                              lv_draw_img_dsc_t * draw_dsc, bool chroma_key, bool alpha_byte)
+                                              const lv_draw_img_dsc_t * draw_dsc,
+                                              bool chroma_key, bool alpha_byte)
 {
     /* Use the clip area as draw area*/
     lv_area_t draw_area;

src/lv_draw/lv_draw_img.h

@@ -53,13 +53,9 @@ void lv_draw_img_dsc_init(lv_draw_img_dsc_t * dsc);
  * @param coords the coordinates of the image
  * @param mask the image will be drawn only in this area
  * @param src pointer to a lv_color_t array which contains the pixels of the image
- * @param style style of the image
- * @param angle rotation angle of the image
- * @param center rotation center of the image
- * @param antialias anti-alias transformations (rotate, zoom) or not
- * @param opa_scale scale down all opacities by the factor
+ * @param dsc pointer to an initialized `lv_draw_img_dsc_t` variable
  */
-void lv_draw_img(const lv_area_t * coords, const lv_area_t * mask, const void * src, lv_draw_img_dsc_t * dsc);
+void lv_draw_img(const lv_area_t * coords, const lv_area_t * mask, const void * src, const lv_draw_img_dsc_t * dsc);
 
 /**
  * Get the type of an image source

src/lv_draw/lv_draw_label.c

@@ -111,8 +111,10 @@ LV_ATTRIBUTE_FAST_MEM void lv_draw_label_dsc_init(lv_draw_label_dsc_t * dsc)
  * @param hint pointer to a `lv_draw_label_hint_t` variable.
  * It is managed by the drawer to speed up the drawing of very long texts (thousands of lines).
  */
-LV_ATTRIBUTE_FAST_MEM void lv_draw_label(const lv_area_t * coords, const lv_area_t * mask, lv_draw_label_dsc_t * dsc,
-                                         const char * txt, lv_draw_label_hint_t * hint)
+LV_ATTRIBUTE_FAST_MEM void lv_draw_label(const lv_area_t * coords, const lv_area_t * mask,
+                                         const lv_draw_label_dsc_t * dsc,
+                                         const char * txt,
+                                         lv_draw_label_hint_t * hint)
 {
 
     if(dsc->opa <= LV_OPA_MIN) return;
@@ -213,12 +215,12 @@ LV_ATTRIBUTE_FAST_MEM void lv_draw_label(const lv_area_t * coords, const lv_area
         sel_start = sel_end;
         sel_end = tmp;
     }
-
     lv_draw_line_dsc_t line_dsc;
+
     if((dsc->decor & LV_TEXT_DECOR_UNDERLINE) || (dsc->decor & LV_TEXT_DECOR_STRIKETHROUGH)) {
         lv_draw_line_dsc_init(&line_dsc);
         line_dsc.color = dsc->color;
-        line_dsc.width = (dsc->font->line_height + 5) / 10;    /*+5 for rounding*/
+        line_dsc.width = font->underline_thickness ? font->underline_thickness : LV_MATH_MAX(font->line_height / 10, 1);
         line_dsc.opa = dsc->opa;
         line_dsc.blend_mode = dsc->blend_mode;
     }
@@ -342,7 +344,7 @@ LV_ATTRIBUTE_FAST_MEM void lv_draw_label(const lv_area_t * coords, const lv_area
             lv_point_t p1;
             lv_point_t p2;
             p1.x = pos_x_start;
-            p1.y = pos.y + dsc->font->line_height - dsc->font->base_line + line_dsc.width / 2 + 1;
+            p1.y = pos.y + dsc->font->line_height - dsc->font->base_line - font->underline_position;
             p2.x = pos.x;
             p2.y = p1.y;
             lv_draw_line(&p1, &p2, mask, &line_dsc);
@@ -420,7 +422,7 @@ LV_ATTRIBUTE_FAST_MEM static void lv_draw_letter(const lv_point_t * pos_p, const
     }
 
     /* Don't draw anything if the character is empty. E.g. space */
-    if((g.box_h == 0) && (g.box_w == 0)) return;
+    if((g.box_h == 0) || (g.box_w == 0)) return;
 
     int32_t pos_x = pos_p->x + g.ofs_x;
     int32_t pos_y = pos_p->y + (font_p->line_height - font_p->base_line) - g.box_h - g.ofs_y;
@@ -607,6 +609,7 @@ LV_ATTRIBUTE_FAST_MEM static void draw_letter_normal(lv_coord_t pos_x, lv_coord_
 static void draw_letter_subpx(lv_coord_t pos_x, lv_coord_t pos_y, lv_font_glyph_dsc_t * g, const lv_area_t * clip_area,
                               const uint8_t * map_p, lv_color_t color, lv_opa_t opa, lv_blend_mode_t blend_mode)
 {
+#if LV_USE_FONT_SUBPX
     const uint8_t * bpp_opa_table;
     uint32_t bitmask_init;
     uint32_t bitmask;
@@ -806,6 +809,9 @@ static void draw_letter_subpx(lv_coord_t pos_x, lv_coord_t pos_y, lv_font_glyph_
 
     _lv_mem_buf_release(mask_buf);
     _lv_mem_buf_release(color_buf);
+#else
+    LV_LOG_WARN("Can't draw sub-pixel rendered letter because LV_USE_FONT_SUBPX == 0 in lv_conf.h");
+#endif
 }
 
 

src/lv_draw/lv_draw_label.h

@@ -77,7 +77,8 @@ LV_ATTRIBUTE_FAST_MEM void lv_draw_label_dsc_init(lv_draw_label_dsc_t * dsc);
  * @param hint pointer to a `lv_draw_label_hint_t` variable.
  * It is managed by the drawer to speed up the drawing of very long texts (thousands of lines).
  */
-LV_ATTRIBUTE_FAST_MEM void lv_draw_label(const lv_area_t * coords, const lv_area_t * mask, lv_draw_label_dsc_t * dsc,
+LV_ATTRIBUTE_FAST_MEM void lv_draw_label(const lv_area_t * coords, const lv_area_t * mask,
+                                         const lv_draw_label_dsc_t * dsc,
                                          const char * txt, lv_draw_label_hint_t * hint);
 
 //! @endcond

src/lv_draw/lv_draw_line.c

@@ -26,13 +26,13 @@
  **********************/
 LV_ATTRIBUTE_FAST_MEM static void draw_line_skew(const lv_point_t * point1, const lv_point_t * point2,
                                                  const lv_area_t * clip,
-                                                 lv_draw_line_dsc_t * dsc);
+                                                 const lv_draw_line_dsc_t * dsc);
 LV_ATTRIBUTE_FAST_MEM static void draw_line_hor(const lv_point_t * point1, const lv_point_t * point2,
                                                 const lv_area_t * clip,
-                                                lv_draw_line_dsc_t * dsc);
+                                                const lv_draw_line_dsc_t * dsc);
 LV_ATTRIBUTE_FAST_MEM static void draw_line_ver(const lv_point_t * point1, const lv_point_t * point2,
                                                 const lv_area_t * clip,
-                                                lv_draw_line_dsc_t * dsc);
+                                                const lv_draw_line_dsc_t * dsc);
 
 /**********************
  *  STATIC VARIABLES
@@ -58,12 +58,11 @@ LV_ATTRIBUTE_FAST_MEM void lv_draw_line_dsc_init(lv_draw_line_dsc_t * dsc)
  * Draw a line
  * @param point1 first point of the line
  * @param point2 second point of the line
- * @param mask the line will be drawn only on this area
- * @param style pointer to a line's style
- * @param opa_scale scale down all opacities by the factor
+ * @param clip the line will be drawn only in this area
+ * @param dsc pointer to an initialized `lv_draw_line_dsc_t` variable
  */
 LV_ATTRIBUTE_FAST_MEM void lv_draw_line(const lv_point_t * point1, const lv_point_t * point2, const lv_area_t * clip,
-                                        lv_draw_line_dsc_t * dsc)
+                                        const lv_draw_line_dsc_t * dsc)
 {
     if(dsc->width == 0) return;
     if(dsc->opa <= LV_OPA_MIN) return;
@@ -120,7 +119,7 @@ LV_ATTRIBUTE_FAST_MEM void lv_draw_line(const lv_point_t * point1, const lv_poin
 
 LV_ATTRIBUTE_FAST_MEM static void draw_line_hor(const lv_point_t * point1, const lv_point_t * point2,
                                                 const lv_area_t * clip,
-                                                lv_draw_line_dsc_t * dsc)
+                                                const lv_draw_line_dsc_t * dsc)
 {
     lv_opa_t opa = dsc->opa;
 
@@ -221,7 +220,7 @@ LV_ATTRIBUTE_FAST_MEM static void draw_line_hor(const lv_point_t * point1, const
 
 LV_ATTRIBUTE_FAST_MEM static void draw_line_ver(const lv_point_t * point1, const lv_point_t * point2,
                                                 const lv_area_t * clip,
-                                                lv_draw_line_dsc_t * dsc)
+                                                const lv_draw_line_dsc_t * dsc)
 {
     lv_opa_t opa = dsc->opa;
 
@@ -316,7 +315,7 @@ LV_ATTRIBUTE_FAST_MEM static void draw_line_ver(const lv_point_t * point1, const
 
 LV_ATTRIBUTE_FAST_MEM static void draw_line_skew(const lv_point_t * point1, const lv_point_t * point2,
                                                  const lv_area_t * clip,
-                                                 lv_draw_line_dsc_t * dsc)
+                                                 const lv_draw_line_dsc_t * dsc)
 {
     /*Keep the great y in p1*/
     lv_point_t p1;

src/lv_draw/lv_draw_line.h

@@ -43,12 +43,11 @@ typedef struct {
  * Draw a line
  * @param point1 first point of the line
  * @param point2 second point of the line
- * @param mask the line will be drawn only on this area
- * @param style pointer to a line's style
- * @param opa_scale scale down all opacities by the factor
+ * @param clip the line will be drawn only in this area
+ * @param dsc pointer to an initialized `lv_draw_line_dsc_t` variable
  */
-LV_ATTRIBUTE_FAST_MEM void lv_draw_line(const lv_point_t * point1, const lv_point_t * point2, const lv_area_t * mask,
-                                        lv_draw_line_dsc_t * dsc);
+LV_ATTRIBUTE_FAST_MEM void lv_draw_line(const lv_point_t * point1, const lv_point_t * point2, const lv_area_t * clip,
+                                        const lv_draw_line_dsc_t * dsc);
 
 LV_ATTRIBUTE_FAST_MEM void lv_draw_line_dsc_init(lv_draw_line_dsc_t * dsc);
 

src/lv_draw/lv_draw_rect.c

@@ -27,20 +27,32 @@
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-LV_ATTRIBUTE_FAST_MEM static void draw_bg(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect_dsc_t * dsc);
+LV_ATTRIBUTE_FAST_MEM static void draw_bg(const lv_area_t * coords, const lv_area_t * clip,
+                                          const lv_draw_rect_dsc_t * dsc);
 LV_ATTRIBUTE_FAST_MEM static void draw_border(const lv_area_t * coords, const lv_area_t * clip,
-                                              lv_draw_rect_dsc_t * dsc);
-static void draw_outline(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect_dsc_t * dsc);
-LV_ATTRIBUTE_FAST_MEM static inline lv_color_t grad_get(lv_draw_rect_dsc_t * dsc, lv_coord_t s, lv_coord_t i);
+                                              const lv_draw_rect_dsc_t * dsc);
+
+#if LV_USE_OUTLINE
+    static void draw_outline(const lv_area_t * coords, const lv_area_t * clip, const lv_draw_rect_dsc_t * dsc);
+#endif
 #if LV_USE_SHADOW
 LV_ATTRIBUTE_FAST_MEM static void draw_shadow(const lv_area_t * coords, const lv_area_t * clip,
-                                              lv_draw_rect_dsc_t * dsc);
+                                              const lv_draw_rect_dsc_t * dsc);
 LV_ATTRIBUTE_FAST_MEM static void shadow_draw_corner_buf(const lv_area_t * coords,  uint16_t * sh_buf, lv_coord_t s,
                                                          lv_coord_t r);
 LV_ATTRIBUTE_FAST_MEM static void shadow_blur_corner(lv_coord_t size, lv_coord_t sw, uint16_t * sh_ups_buf);
 #endif
-static void draw_pattern(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect_dsc_t * dsc);
-static void draw_value(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect_dsc_t * dsc);
+
+#if LV_USE_PATTERN
+    static void draw_pattern(const lv_area_t * coords, const lv_area_t * clip, const lv_draw_rect_dsc_t * dsc);
+#endif
+
+#if LV_USE_VALUE_STR
+    static void draw_value_str(const lv_area_t * coords, const lv_area_t * clip, const lv_draw_rect_dsc_t * dsc);
+#endif
+static void draw_full_border(const lv_area_t * area_inner, const lv_area_t * area_outer, const lv_area_t * clip,
+                             lv_coord_t radius, lv_color_t color, lv_opa_t opa, lv_blend_mode_t blend_mode);
+LV_ATTRIBUTE_FAST_MEM static inline lv_color_t grad_get(const lv_draw_rect_dsc_t * dsc, lv_coord_t s, lv_coord_t i);
 
 /**********************
  *  STATIC VARIABLES
@@ -85,9 +97,9 @@ LV_ATTRIBUTE_FAST_MEM void lv_draw_rect_dsc_init(lv_draw_rect_dsc_t * dsc)
  * Draw a rectangle
  * @param coords the coordinates of the rectangle
  * @param mask the rectangle will be drawn only in this mask
- * @param style pointer to a style
+ * @param dsc pointer to an initialized `lv_draw_rect_dsc_t` variable
  */
-void lv_draw_rect(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect_dsc_t * dsc)
+void lv_draw_rect(const lv_area_t * coords, const lv_area_t * clip, const lv_draw_rect_dsc_t * dsc)
 {
     if(lv_area_get_height(coords) < 1 || lv_area_get_width(coords) < 1) return;
 #if LV_USE_SHADOW
@@ -95,10 +107,19 @@ void lv_draw_rect(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect
 #endif
 
     draw_bg(coords, clip, dsc);
+
+#if LV_USE_PATTERN
     draw_pattern(coords, clip, dsc);
+#endif
     draw_border(coords, clip, dsc);
-    draw_value(coords, clip, dsc);
+
+#if LV_USE_VALUE_STR
+    draw_value_str(coords, clip, dsc);
+#endif
+
+#if LV_USE_OUTLINE
     draw_outline(coords, clip, dsc);
+#endif
 
     LV_ASSERT_MEM_INTEGRITY();
 }
@@ -142,7 +163,8 @@ void lv_draw_px(const lv_point_t * point, const lv_area_t * clip_area, const lv_
  *   STATIC FUNCTIONS
  **********************/
 
-LV_ATTRIBUTE_FAST_MEM static void draw_bg(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect_dsc_t * dsc)
+LV_ATTRIBUTE_FAST_MEM static void draw_bg(const lv_area_t * coords, const lv_area_t * clip,
+                                          const lv_draw_rect_dsc_t * dsc)
 {
     if(dsc->bg_opa <= LV_OPA_MIN) return;
 
@@ -364,46 +386,12 @@ LV_ATTRIBUTE_FAST_MEM static void draw_bg(const lv_area_t * coords, const lv_are
 }
 
 LV_ATTRIBUTE_FAST_MEM static void draw_border(const lv_area_t * coords, const lv_area_t * clip,
-                                              lv_draw_rect_dsc_t * dsc)
+                                              const lv_draw_rect_dsc_t * dsc)
 {
     if(dsc->border_opa <= LV_OPA_MIN) return;
     if(dsc->border_width == 0) return;
     if(dsc->border_side == LV_BORDER_SIDE_NONE) return;
-
-    lv_opa_t opa = dsc->border_opa;
-
-    if(opa > LV_OPA_MAX) opa = LV_OPA_COVER;
-
-    lv_disp_t * disp    = _lv_refr_get_disp_refreshing();
-    lv_disp_buf_t * vdb = lv_disp_get_buf(disp);
-
-    /* Get clipped fill area which is the real draw area.
-     * It is always the same or inside `fill_area` */
-    lv_area_t draw_area;
-    bool is_common;
-    is_common = _lv_area_intersect(&draw_area, coords, clip);
-    if(is_common == false) return;
-
-    const lv_area_t * disp_area = &vdb->area;
-
-    /* Now `draw_area` has absolute coordinates.
-     * Make it relative to `disp_area` to simplify draw to `disp_buf`*/
-    draw_area.x1 -= disp_area->x1;
-    draw_area.y1 -= disp_area->y1;
-    draw_area.x2 -= disp_area->x1;
-    draw_area.y2 -= disp_area->y1;
-
-    int32_t draw_area_w = lv_area_get_width(&draw_area);
-
-    /*Create a mask if there is a radius*/
-    lv_opa_t * mask_buf = _lv_mem_buf_get(draw_area_w);
-
-    uint8_t other_mask_cnt = lv_draw_mask_get_cnt();
-    bool simple_mode = true;
-    if(other_mask_cnt) simple_mode = false;
-    else if(dsc->border_side != LV_BORDER_SIDE_FULL) simple_mode = false;
-
-    int16_t mask_rout_id = LV_MASK_ID_INV;
+    if(dsc->border_post) return;
 
     int32_t coords_w = lv_area_get_width(coords);
     int32_t coords_h = lv_area_get_height(coords);
@@ -413,133 +401,69 @@ LV_ATTRIBUTE_FAST_MEM static void draw_border(const lv_area_t * coords, const lv
     int32_t short_side = LV_MATH_MIN(coords_w, coords_h);
     if(rout > short_side >> 1) rout = short_side >> 1;
 
-    /*Get the outer area*/
-    lv_draw_mask_radius_param_t mask_rout_param;
-    if(rout > 0) {
-        lv_draw_mask_radius_init(&mask_rout_param, coords, rout, false);
-        mask_rout_id = lv_draw_mask_add(&mask_rout_param, NULL);
-    }
-
-    /*Get the inner radius*/
-    int32_t rin = rout - dsc->border_width;
-    if(rin < 0) rin = 0;
-
     /*Get the inner area*/
-    lv_area_t area_small;
-    lv_area_copy(&area_small, coords);
-    area_small.x1 += ((dsc->border_side & LV_BORDER_SIDE_LEFT) ? dsc->border_width : - (dsc->border_width + rout));
-    area_small.x2 -= ((dsc->border_side & LV_BORDER_SIDE_RIGHT) ? dsc->border_width : - (dsc->border_width + rout));
-    area_small.y1 += ((dsc->border_side & LV_BORDER_SIDE_TOP) ? dsc->border_width : - (dsc->border_width + rout));
-    area_small.y2 -= ((dsc->border_side & LV_BORDER_SIDE_BOTTOM) ? dsc->border_width : - (dsc->border_width + rout));
+    lv_area_t area_inner;
+    lv_area_copy(&area_inner, coords);
+    area_inner.x1 += ((dsc->border_side & LV_BORDER_SIDE_LEFT) ? dsc->border_width : - (dsc->border_width + rout));
+    area_inner.x2 -= ((dsc->border_side & LV_BORDER_SIDE_RIGHT) ? dsc->border_width : - (dsc->border_width + rout));
+    area_inner.y1 += ((dsc->border_side & LV_BORDER_SIDE_TOP) ? dsc->border_width : - (dsc->border_width + rout));
+    area_inner.y2 -= ((dsc->border_side & LV_BORDER_SIDE_BOTTOM) ? dsc->border_width : - (dsc->border_width + rout));
 
-    /*Create inner the mask*/
-    lv_draw_mask_radius_param_t mask_rin_param;
-    lv_draw_mask_radius_init(&mask_rin_param, &area_small, rout - dsc->border_width, true);
-    int16_t mask_rin_id = lv_draw_mask_add(&mask_rin_param, NULL);
-
-    int32_t corner_size = LV_MATH_MAX(rout, dsc->border_width - 1);
-
-    int32_t h;
-    lv_draw_mask_res_t mask_res;
-    lv_area_t fill_area;
-
-    lv_color_t color = dsc->border_color;
-    lv_blend_mode_t blend_mode = dsc->border_blend_mode;
-
-    /*Apply some optimization if there is no other mask*/
-    if(simple_mode) {
-        /*Draw the upper corner area*/
-        int32_t upper_corner_end = coords->y1 - disp_area->y1 + corner_size;
-        upper_corner_end = LV_MATH_MIN(upper_corner_end, draw_area.y2);
-        fill_area.x1 = coords->x1;
-        fill_area.x2 = coords->x2;
-        fill_area.y1 = disp_area->y1 + draw_area.y1;
-        fill_area.y2 = fill_area.y1;
-        for(h = draw_area.y1; h <= upper_corner_end; h++) {
-            _lv_memset_ff(mask_buf, draw_area_w);
-            mask_res = lv_draw_mask_apply(mask_buf, vdb->area.x1 + draw_area.x1, vdb->area.y1 + h, draw_area_w);
-
-            lv_area_t fill_area2;
-            fill_area2.y1 = fill_area.y1;
-            fill_area2.y2 = fill_area.y2;
-
-            fill_area2.x1 = coords->x1;
-            fill_area2.x2 = coords->x1 + rout - 1;
-
-            _lv_blend_fill(clip, &fill_area2, color, mask_buf, mask_res, opa, blend_mode);
-
-            /*Draw the top horizontal line*/
-            if(fill_area2.y2 < coords->y1 + dsc->border_width) {
-                fill_area2.x1 = coords->x1 + rout;
-                fill_area2.x2 = coords->x2 - rout;
-
-                _lv_blend_fill(clip, &fill_area2, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
-            }
-
-            fill_area2.x1 = coords->x2 - rout + 1;
-            fill_area2.x2 = coords->x2;
-
-            int32_t mask_ofs = (coords->x2 - rout + 1) - (vdb->area.x1 + draw_area.x1);
-            if(mask_ofs < 0) mask_ofs = 0;
-            _lv_blend_fill(clip, &fill_area2, color, mask_buf + mask_ofs, mask_res, opa, blend_mode);
-
-            fill_area.y1++;
-            fill_area.y2++;
-        }
-
-        /*Draw the lower corner area */
-        int32_t lower_corner_end = coords->y2 - disp_area->y1 - corner_size;
-        lower_corner_end = LV_MATH_MAX(lower_corner_end, draw_area.y1);
-        if(lower_corner_end <= upper_corner_end) lower_corner_end = upper_corner_end + 1;
-        fill_area.y1 = disp_area->y1 + lower_corner_end;
-        fill_area.y2 = fill_area.y1;
-        for(h = lower_corner_end; h <= draw_area.y2; h++) {
-            _lv_memset_ff(mask_buf, draw_area_w);
-            mask_res = lv_draw_mask_apply(mask_buf, vdb->area.x1 + draw_area.x1, vdb->area.y1 + h, draw_area_w);
-
-            lv_area_t fill_area2;
-            fill_area2.x1 = coords->x1;
-            fill_area2.x2 = coords->x1 + rout - 1;
-            fill_area2.y1 = fill_area.y1;
-            fill_area2.y2 = fill_area.y2;
-
-            _lv_blend_fill(clip, &fill_area2, color, mask_buf, mask_res, opa, blend_mode);
-
-            /*Draw the bottom horizontal line*/
-            if(fill_area2.y2 > coords->y2 - dsc->border_width) {
-                fill_area2.x1 = coords->x1 + rout;
-                fill_area2.x2 = coords->x2 - rout;
-
-                _lv_blend_fill(clip, &fill_area2, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
-            }
-            fill_area2.x1 = coords->x2 - rout + 1;
-            fill_area2.x2 = coords->x2;
-
-            int32_t mask_ofs = (coords->x2 - rout + 1) - (vdb->area.x1 + draw_area.x1);
-            if(mask_ofs < 0) mask_ofs = 0;
-            _lv_blend_fill(clip, &fill_area2, color, mask_buf + mask_ofs, mask_res, opa, blend_mode);
-
-
-            fill_area.y1++;
-            fill_area.y2++;
-        }
-
-        /*Draw the left vertical border part*/
-        fill_area.y1 = coords->y1 + corner_size + 1;
-        fill_area.y2 = coords->y2 - corner_size - 1;
-
-        fill_area.x1 = coords->x1;
-        fill_area.x2 = coords->x1 + dsc->border_width - 1;
-        _lv_blend_fill(clip, &fill_area, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
-
-        /*Draw the right vertical border*/
-        fill_area.x1 = coords->x2 - dsc->border_width + 1;
-        fill_area.x2 = coords->x2;
-
-        _lv_blend_fill(clip, &fill_area, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
+    if(dsc->border_side == LV_BORDER_SIDE_FULL) {
+        draw_full_border(&area_inner, coords, clip, dsc->radius, dsc->border_color, dsc->border_opa, dsc->border_blend_mode);
     }
-    /*Process line by line if there is other mask too*/
     else {
+        lv_opa_t opa = dsc->border_opa;
+        if(opa > LV_OPA_MAX) opa = LV_OPA_COVER;
+
+        lv_disp_t * disp    = _lv_refr_get_disp_refreshing();
+        lv_disp_buf_t * vdb = lv_disp_get_buf(disp);
+
+        /* Get clipped fill area which is the real draw area.
+         * It is always the same or inside `fill_area` */
+        lv_area_t draw_area;
+        bool is_common;
+        is_common = _lv_area_intersect(&draw_area, coords, clip);
+        if(is_common == false) return;
+
+        const lv_area_t * disp_area = &vdb->area;
+
+        /* Now `draw_area` has absolute coordinates.
+         * Make it relative to `disp_area` to simplify draw to `disp_buf`*/
+        draw_area.x1 -= disp_area->x1;
+        draw_area.y1 -= disp_area->y1;
+        draw_area.x2 -= disp_area->x1;
+        draw_area.y2 -= disp_area->y1;
+
+        int32_t draw_area_w = lv_area_get_width(&draw_area);
+
+        /*Create a mask if there is a radius*/
+        lv_opa_t * mask_buf = _lv_mem_buf_get(draw_area_w);
+
+        /*Create mask for the outer area*/
+        int16_t mask_rout_id = LV_MASK_ID_INV;
+        lv_draw_mask_radius_param_t mask_rout_param;
+        if(rout > 0) {
+            lv_draw_mask_radius_init(&mask_rout_param, coords, rout, false);
+            mask_rout_id = lv_draw_mask_add(&mask_rout_param, NULL);
+        }
+
+        /*Create mask for the inner mask*/
+        int32_t rin = rout - dsc->border_width;
+        if(rin < 0) rin = 0;
+        lv_draw_mask_radius_param_t mask_rin_param;
+        lv_draw_mask_radius_init(&mask_rin_param, &area_inner, rout - dsc->border_width, true);
+        int16_t mask_rin_id = lv_draw_mask_add(&mask_rin_param, NULL);
+
+        int32_t corner_size = LV_MATH_MAX(rout, dsc->border_width - 1);
+
+        int32_t h;
+        lv_draw_mask_res_t mask_res;
+        lv_area_t fill_area;
+
+        lv_color_t color = dsc->border_color;
+        lv_blend_mode_t blend_mode = dsc->border_blend_mode;
+
         fill_area.x1 = coords->x1;
         fill_area.x2 = coords->x2;
         fill_area.y1 = disp_area->y1 + draw_area.y1;
@@ -575,13 +499,13 @@ LV_ATTRIBUTE_FAST_MEM static void draw_border(const lv_area_t * coords, const lv
             fill_area.y2++;
 
         }
+        lv_draw_mask_remove_id(mask_rin_id);
+        lv_draw_mask_remove_id(mask_rout_id);
+        _lv_mem_buf_release(mask_buf);
     }
-    lv_draw_mask_remove_id(mask_rin_id);
-    lv_draw_mask_remove_id(mask_rout_id);
-    _lv_mem_buf_release(mask_buf);
 }
 
-LV_ATTRIBUTE_FAST_MEM static inline lv_color_t grad_get(lv_draw_rect_dsc_t * dsc, lv_coord_t s, lv_coord_t i)
+LV_ATTRIBUTE_FAST_MEM static inline lv_color_t grad_get(const lv_draw_rect_dsc_t * dsc, lv_coord_t s, lv_coord_t i)
 {
     int32_t min = (dsc->bg_main_color_stop * s) >> 8;
     if(i <= min) return dsc->bg_color;
@@ -598,7 +522,7 @@ LV_ATTRIBUTE_FAST_MEM static inline lv_color_t grad_get(lv_draw_rect_dsc_t * dsc
 
 #if LV_USE_SHADOW
 LV_ATTRIBUTE_FAST_MEM static void draw_shadow(const lv_area_t * coords, const lv_area_t * clip,
-                                              lv_draw_rect_dsc_t * dsc)
+                                              const lv_draw_rect_dsc_t * dsc)
 {
     /*Check whether the shadow is visible*/
     if(dsc->shadow_width == 0) return;
@@ -1226,7 +1150,8 @@ LV_ATTRIBUTE_FAST_MEM static void shadow_blur_corner(lv_coord_t size, lv_coord_t
 
 #endif
 
-static void draw_outline(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect_dsc_t * dsc)
+#if LV_USE_OUTLINE
+static void draw_outline(const lv_area_t * coords, const lv_area_t * clip, const lv_draw_rect_dsc_t * dsc)
 {
     if(dsc->outline_opa <= LV_OPA_MIN) return;
     if(dsc->outline_width == 0) return;
@@ -1235,10 +1160,6 @@ static void draw_outline(const lv_area_t * coords, const lv_area_t * clip, lv_dr
 
     if(opa > LV_OPA_MAX) opa = LV_OPA_COVER;
 
-    uint8_t other_mask_cnt = lv_draw_mask_get_cnt();
-    bool simple_mode = true;
-    if(other_mask_cnt) simple_mode = false;
-
     /*Get the inner radius*/
     lv_area_t area_inner;
     lv_area_copy(&area_inner, coords);
@@ -1247,16 +1168,6 @@ static void draw_outline(const lv_area_t * coords, const lv_area_t * clip, lv_dr
     area_inner.x2 += dsc->outline_pad;
     area_inner.y2 += dsc->outline_pad;
 
-    int32_t inner_w = lv_area_get_width(&area_inner);
-    int32_t inner_h = lv_area_get_height(&area_inner);
-
-    int32_t rin = dsc->radius;
-    int32_t short_side = LV_MATH_MIN(inner_w, inner_h);
-    if(rin > short_side >> 1) rin = short_side >> 1;
-
-    /*Get the outer area*/
-    int32_t rout = rin + dsc->outline_width;
-
     lv_area_t area_outer;
     lv_area_copy(&area_outer, &area_inner);
 
@@ -1265,166 +1176,13 @@ static void draw_outline(const lv_area_t * coords, const lv_area_t * clip, lv_dr
     area_outer.y1 -= dsc->outline_width;
     area_outer.y2 += dsc->outline_width;
 
-    int32_t coords_out_w = lv_area_get_width(&area_outer);
-    int32_t coords_out_h = lv_area_get_height(&area_outer);
-    short_side = LV_MATH_MIN(coords_out_w, coords_out_h);
-    if(rout > short_side >> 1) rout = short_side >> 1;
-
-    lv_disp_t * disp    = _lv_refr_get_disp_refreshing();
-    lv_disp_buf_t * vdb = lv_disp_get_buf(disp);
-
-    /* Get clipped fill area which is the real draw area.
-     * It is always the same or inside `fill_area` */
-    lv_area_t draw_area;
-    bool is_common;
-    is_common = _lv_area_intersect(&draw_area, &area_outer, clip);
-    if(is_common == false) return;
-
-    const lv_area_t * disp_area = &vdb->area;
-
-    /* Now `draw_area` has absolute coordinates.
-     * Make it relative to `disp_area` to simplify draw to `disp_buf`*/
-    draw_area.x1 -= disp_area->x1;
-    draw_area.y1 -= disp_area->y1;
-    draw_area.x2 -= disp_area->x1;
-    draw_area.y2 -= disp_area->y1;
-
-    int32_t draw_area_w = lv_area_get_width(&draw_area);
-
-    /*Create inner the mask*/
-    lv_draw_mask_radius_param_t mask_rin_param;
-    lv_draw_mask_radius_init(&mask_rin_param, &area_inner, rin, true);
-    int16_t mask_rin_id = lv_draw_mask_add(&mask_rin_param, NULL);
-
-    lv_draw_mask_radius_param_t mask_rout_param;
-    lv_draw_mask_radius_init(&mask_rout_param, &area_outer, rout, false);
-    int16_t mask_rout_id = lv_draw_mask_add(&mask_rout_param, NULL);
-
-    lv_opa_t * mask_buf = _lv_mem_buf_get(draw_area_w);
-
-    int32_t corner_size = LV_MATH_MAX(rout, dsc->outline_width - 1);
-
-    int32_t h;
-    lv_draw_mask_res_t mask_res;
-    lv_area_t fill_area;
-
-    lv_color_t color = dsc->outline_color;
-    lv_blend_mode_t blend_mode = dsc->outline_blend_mode;
-
-    /*Apply some optimization if there is no other mask*/
-    if(simple_mode) {
-        /*Draw the upper corner area*/
-        int32_t upper_corner_end = area_outer.y1 - disp_area->y1 + corner_size;
-
-        fill_area.x1 = area_outer.x1;
-        fill_area.x2 = area_outer.x2;
-        fill_area.y1 = disp_area->y1 + draw_area.y1;
-        fill_area.y2 = fill_area.y1;
-        for(h = draw_area.y1; h <= upper_corner_end; h++) {
-            _lv_memset_ff(mask_buf, draw_area_w);
-            mask_res = lv_draw_mask_apply(mask_buf, vdb->area.x1 + draw_area.x1, vdb->area.y1 + h, draw_area_w);
-
-            lv_area_t fill_area2;
-            fill_area2.y1 = fill_area.y1;
-            fill_area2.y2 = fill_area.y2;
-
-            fill_area2.x1 = area_outer.x1;
-            fill_area2.x2 = area_outer.x1 + rout - 1;
-
-            _lv_blend_fill(clip, &fill_area2, color, mask_buf, mask_res, opa, blend_mode);
-
-            /*Draw the top horizontal line*/
-            if(fill_area2.y2 < area_outer.y1 + dsc->outline_width) {
-                fill_area2.x1 = area_outer.x1 + rout;
-                fill_area2.x2 = area_outer.x2 - rout;
-
-                _lv_blend_fill(clip, &fill_area2, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
-            }
-
-            fill_area2.x1 = area_outer.x2 - rout + 1;
-            fill_area2.x2 = area_outer.x2;
-
-            int32_t mask_ofs = (area_outer.x2 - rout + 1) - (vdb->area.x1 + draw_area.x1);
-            if(mask_ofs < 0) mask_ofs = 0;
-            _lv_blend_fill(clip, &fill_area2, color, mask_buf + mask_ofs, mask_res, opa, blend_mode);
-
-            fill_area.y1++;
-            fill_area.y2++;
-        }
-
-        /*Draw the lower corner area */
-        int32_t lower_corner_end = area_outer.y2 - disp_area->y1 - corner_size;
-        if(lower_corner_end <= upper_corner_end) lower_corner_end = upper_corner_end + 1;
-        fill_area.y1 = disp_area->y1 + lower_corner_end;
-        fill_area.y2 = fill_area.y1;
-        for(h = lower_corner_end; h <= draw_area.y2; h++) {
-            _lv_memset_ff(mask_buf, draw_area_w);
-            mask_res = lv_draw_mask_apply(mask_buf, vdb->area.x1 + draw_area.x1, vdb->area.y1 + h, draw_area_w);
-
-            lv_area_t fill_area2;
-            fill_area2.x1 = area_outer.x1;
-            fill_area2.x2 = area_outer.x1 + rout - 1;
-            fill_area2.y1 = fill_area.y1;
-            fill_area2.y2 = fill_area.y2;
-
-            _lv_blend_fill(clip, &fill_area2, color, mask_buf, mask_res, opa, blend_mode);
-
-            /*Draw the bottom horizontal line*/
-            if(fill_area2.y2 > area_outer.y2 - dsc->outline_width) {
-                fill_area2.x1 = area_outer.x1 + rout;
-                fill_area2.x2 = area_outer.x2 - rout;
-
-                _lv_blend_fill(clip, &fill_area2, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
-            }
-            fill_area2.x1 = area_outer.x2 - rout + 1;
-            fill_area2.x2 = area_outer.x2;
-
-            int32_t mask_ofs = (area_outer.x2 - rout + 1) - (vdb->area.x1 + draw_area.x1);
-            if(mask_ofs < 0) mask_ofs = 0;
-            _lv_blend_fill(clip, &fill_area2, color, mask_buf + mask_ofs, mask_res, opa, blend_mode);
-
-
-            fill_area.y1++;
-            fill_area.y2++;
-        }
-
-        /*Draw the left vertical part*/
-        fill_area.y1 = area_outer.y1 + corner_size + 1;
-        fill_area.y2 = area_outer.y2 - corner_size - 1;
-
-        fill_area.x1 = area_outer.x1;
-        fill_area.x2 = area_outer.x1 + dsc->outline_width - 1;
-        _lv_blend_fill(clip, &fill_area, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
-
-        /*Draw the right vertical border*/
-        fill_area.x1 = area_outer.x2 - dsc->outline_width + 1;
-        fill_area.x2 = area_outer.x2;
-
-        _lv_blend_fill(clip, &fill_area, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
-    }
-    /*Process line by line if there is other mask too*/
-    else {
-        fill_area.x1 = area_outer.x1;
-        fill_area.x2 = area_outer.x2;
-        fill_area.y1 = disp_area->y1 + draw_area.y1;
-        fill_area.y2 = fill_area.y1;
-
-        for(h = draw_area.y1; h <= draw_area.y2; h++) {
-            _lv_memset_ff(mask_buf, draw_area_w);
-            mask_res = lv_draw_mask_apply(mask_buf, vdb->area.x1 + draw_area.x1, vdb->area.y1 + h, draw_area_w);
-
-            _lv_blend_fill(clip, &fill_area, color, mask_buf, mask_res, opa, blend_mode);
-            fill_area.y1++;
-            fill_area.y2++;
-
-        }
-    }
-    lv_draw_mask_remove_id(mask_rin_id);
-    lv_draw_mask_remove_id(mask_rout_id);
-    _lv_mem_buf_release(mask_buf);
+    draw_full_border(&area_inner, &area_outer, clip, dsc->radius, dsc->outline_color, dsc->outline_opa,
+                     dsc->outline_blend_mode);
 }
+#endif
 
-static void draw_pattern(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect_dsc_t * dsc)
+#if LV_USE_PATTERN
+static void draw_pattern(const lv_area_t * coords, const lv_area_t * clip, const lv_draw_rect_dsc_t * dsc)
 {
     if(dsc->pattern_image == NULL) return;
     if(dsc->pattern_opa <= LV_OPA_MIN) return;
@@ -1524,9 +1282,11 @@ static void draw_pattern(const lv_area_t * coords, const lv_area_t * clip, lv_dr
         lv_draw_mask_remove_id(radius_mask_id);
     }
 }
+#endif
 
 
-static void draw_value(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect_dsc_t * dsc)
+#if LV_USE_VALUE_STR
+static void draw_value_str(const lv_area_t * coords, const lv_area_t * clip, const lv_draw_rect_dsc_t * dsc)
 {
     if(dsc->value_str == NULL) return;
     if(dsc->value_opa <= LV_OPA_MIN) return;
@@ -1559,3 +1319,179 @@ static void draw_value(const lv_area_t * coords, const lv_area_t * clip, lv_draw
 
     lv_draw_label(&value_area, clip, &label_dsc, dsc->value_str, NULL);
 }
+#endif
+
+static void draw_full_border(const lv_area_t * area_inner, const lv_area_t * area_outer, const lv_area_t * clip,
+                             lv_coord_t radius, lv_color_t color, lv_opa_t opa, lv_blend_mode_t blend_mode)
+{
+    uint8_t other_mask_cnt = lv_draw_mask_get_cnt();
+    bool simple_mode = true;
+    if(other_mask_cnt) simple_mode = false;
+
+    int32_t inner_w = lv_area_get_width(area_inner);
+    int32_t inner_h = lv_area_get_height(area_inner);
+    lv_coord_t border_width = area_outer->x2 - area_inner->x2;
+    int32_t rin = radius;
+
+    int32_t short_side = LV_MATH_MIN(inner_w, inner_h);
+    if(rin > short_side >> 1) rin = short_side >> 1;
+
+    /*Get the outer area*/
+    int32_t rout = rin + border_width;
+
+    int32_t coords_out_w = lv_area_get_width(area_outer);
+    int32_t coords_out_h = lv_area_get_height(area_outer);
+    short_side = LV_MATH_MIN(coords_out_w, coords_out_h);
+    if(rout > short_side >> 1) rout = short_side >> 1;
+
+    lv_disp_t * disp    = _lv_refr_get_disp_refreshing();
+    lv_disp_buf_t * vdb = lv_disp_get_buf(disp);
+
+    /* Get clipped fill area which is the real draw area.
+     * It is always the same or inside `fill_area` */
+    lv_area_t draw_area;
+    bool is_common;
+    is_common = _lv_area_intersect(&draw_area, area_outer, clip);
+    if(is_common == false) return;
+
+    const lv_area_t * disp_area = &vdb->area;
+
+    /* Now `draw_area` has absolute coordinates.
+     * Make it relative to `disp_area` to simplify draw to `disp_buf`*/
+    draw_area.x1 -= disp_area->x1;
+    draw_area.y1 -= disp_area->y1;
+    draw_area.x2 -= disp_area->x1;
+    draw_area.y2 -= disp_area->y1;
+
+    int32_t draw_area_w = lv_area_get_width(&draw_area);
+
+    /*Create inner the mask*/
+    lv_draw_mask_radius_param_t mask_rin_param;
+    lv_draw_mask_radius_init(&mask_rin_param, area_inner, rin, true);
+    int16_t mask_rin_id = lv_draw_mask_add(&mask_rin_param, NULL);
+
+    lv_draw_mask_radius_param_t mask_rout_param;
+    lv_draw_mask_radius_init(&mask_rout_param, area_outer, rout, false);
+    int16_t mask_rout_id = lv_draw_mask_add(&mask_rout_param, NULL);
+
+    lv_opa_t * mask_buf = _lv_mem_buf_get(draw_area_w);
+
+    int32_t corner_size = LV_MATH_MAX(rout, border_width - 1);
+
+    int32_t h;
+    lv_draw_mask_res_t mask_res;
+    lv_area_t fill_area;
+
+    /*Apply some optimization if there is no other mask*/
+    if(simple_mode) {
+        /*Draw the upper corner area*/
+        int32_t upper_corner_end = area_outer->y1 - disp_area->y1 + corner_size;
+
+        fill_area.x1 = area_outer->x1;
+        fill_area.x2 = area_outer->x2;
+        fill_area.y1 = disp_area->y1 + draw_area.y1;
+        fill_area.y2 = fill_area.y1;
+        for(h = draw_area.y1; h <= upper_corner_end; h++) {
+            _lv_memset_ff(mask_buf, draw_area_w);
+            mask_res = lv_draw_mask_apply(mask_buf, vdb->area.x1 + draw_area.x1, vdb->area.y1 + h, draw_area_w);
+
+            lv_area_t fill_area2;
+            fill_area2.y1 = fill_area.y1;
+            fill_area2.y2 = fill_area.y2;
+
+            fill_area2.x1 = area_outer->x1;
+            fill_area2.x2 = area_outer->x1 + rout - 1;
+
+            _lv_blend_fill(clip, &fill_area2, color, mask_buf, mask_res, opa, blend_mode);
+
+            /*Draw the top horizontal line*/
+            if(fill_area2.y2 < area_outer->y1 + border_width) {
+                fill_area2.x1 = area_outer->x1 + rout;
+                fill_area2.x2 = area_outer->x2 - rout;
+
+                _lv_blend_fill(clip, &fill_area2, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
+            }
+
+            fill_area2.x1 = area_outer->x2 - rout + 1;
+            fill_area2.x2 = area_outer->x2;
+
+            int32_t mask_ofs = (area_outer->x2 - rout + 1) - (vdb->area.x1 + draw_area.x1);
+            if(mask_ofs < 0) mask_ofs = 0;
+            _lv_blend_fill(clip, &fill_area2, color, mask_buf + mask_ofs, mask_res, opa, blend_mode);
+
+            fill_area.y1++;
+            fill_area.y2++;
+        }
+
+        /*Draw the lower corner area */
+        int32_t lower_corner_end = area_outer->y2 - disp_area->y1 - corner_size;
+        if(lower_corner_end <= upper_corner_end) lower_corner_end = upper_corner_end + 1;
+        fill_area.y1 = disp_area->y1 + lower_corner_end;
+        fill_area.y2 = fill_area.y1;
+        for(h = lower_corner_end; h <= draw_area.y2; h++) {
+            _lv_memset_ff(mask_buf, draw_area_w);
+            mask_res = lv_draw_mask_apply(mask_buf, vdb->area.x1 + draw_area.x1, vdb->area.y1 + h, draw_area_w);
+
+            lv_area_t fill_area2;
+            fill_area2.x1 = area_outer->x1;
+            fill_area2.x2 = area_outer->x1 + rout - 1;
+            fill_area2.y1 = fill_area.y1;
+            fill_area2.y2 = fill_area.y2;
+
+            _lv_blend_fill(clip, &fill_area2, color, mask_buf, mask_res, opa, blend_mode);
+
+            /*Draw the bottom horizontal line*/
+            if(fill_area2.y2 > area_outer->y2 - border_width) {
+                fill_area2.x1 = area_outer->x1 + rout;
+                fill_area2.x2 = area_outer->x2 - rout;
+
+                _lv_blend_fill(clip, &fill_area2, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
+            }
+            fill_area2.x1 = area_outer->x2 - rout + 1;
+            fill_area2.x2 = area_outer->x2;
+
+            int32_t mask_ofs = (area_outer->x2 - rout + 1) - (vdb->area.x1 + draw_area.x1);
+            if(mask_ofs < 0) mask_ofs = 0;
+            _lv_blend_fill(clip, &fill_area2, color, mask_buf + mask_ofs, mask_res, opa, blend_mode);
+
+
+            fill_area.y1++;
+            fill_area.y2++;
+        }
+
+        /*Draw the left vertical part*/
+        fill_area.y1 = area_outer->y1 + corner_size + 1;
+        fill_area.y2 = area_outer->y2 - corner_size - 1;
+
+        fill_area.x1 = area_outer->x1;
+        fill_area.x2 = area_outer->x1 + border_width - 1;
+        _lv_blend_fill(clip, &fill_area, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
+
+        /*Draw the right vertical border*/
+        fill_area.x1 = area_outer->x2 - border_width + 1;
+        fill_area.x2 = area_outer->x2;
+
+        _lv_blend_fill(clip, &fill_area, color, NULL, LV_DRAW_MASK_RES_FULL_COVER, opa, blend_mode);
+    }
+    /*Process line by line if there is other mask too*/
+    else {
+        fill_area.x1 = area_outer->x1;
+        fill_area.x2 = area_outer->x2;
+        fill_area.y1 = disp_area->y1 + draw_area.y1;
+        fill_area.y2 = fill_area.y1;
+
+        for(h = draw_area.y1; h <= draw_area.y2; h++) {
+            _lv_memset_ff(mask_buf, draw_area_w);
+            mask_res = lv_draw_mask_apply(mask_buf, vdb->area.x1 + draw_area.x1, vdb->area.y1 + h, draw_area_w);
+
+            _lv_blend_fill(clip, &fill_area, color, mask_buf, mask_res, opa, blend_mode);
+            fill_area.y1++;
+            fill_area.y2++;
+
+        }
+    }
+    lv_draw_mask_remove_id(mask_rin_id);
+    lv_draw_mask_remove_id(mask_rout_id);
+    _lv_mem_buf_release(mask_buf);
+}
+

src/lv_draw/lv_draw_rect.h

@@ -41,6 +41,7 @@ typedef struct {
     lv_style_int_t border_side;
     lv_opa_t border_opa;
     lv_blend_mode_t border_blend_mode;
+    uint8_t border_post : 1;        /*There is a border it will be drawn later. */
 
     /*Outline*/
     lv_color_t outline_color;
@@ -92,9 +93,9 @@ LV_ATTRIBUTE_FAST_MEM void lv_draw_rect_dsc_init(lv_draw_rect_dsc_t * dsc);
  * Draw a rectangle
  * @param coords the coordinates of the rectangle
  * @param mask the rectangle will be drawn only in this mask
- * @param style pointer to a style
+ * @param dsc pointer to an initialized `lv_draw_rect_dsc_t` variable
  */
-void lv_draw_rect(const lv_area_t * coords, const lv_area_t * mask, lv_draw_rect_dsc_t * dsc);
+void lv_draw_rect(const lv_area_t * coords, const lv_area_t * mask, const lv_draw_rect_dsc_t * dsc);
 
 /**
  * Draw a pixel

src/lv_draw/lv_draw_triangle.c

@@ -40,7 +40,7 @@
  * @param clip_area the triangle will be drawn only in this area
  * @param draw_dsc pointer to an initialized `lv_draw_rect_dsc_t` variable
  */
-void lv_draw_triangle(const lv_point_t points[], const lv_area_t * clip_area, lv_draw_rect_dsc_t * draw_dsc)
+void lv_draw_triangle(const lv_point_t points[], const lv_area_t * clip_area, const lv_draw_rect_dsc_t * draw_dsc)
 {
     lv_draw_polygon(points, 3, clip_area, draw_dsc);
 }
@@ -53,7 +53,7 @@ void lv_draw_triangle(const lv_point_t points[], const lv_area_t * clip_area, lv
  * @param draw_dsc pointer to an initialized `lv_draw_rect_dsc_t` variable
  */
 void lv_draw_polygon(const lv_point_t points[], uint16_t point_cnt, const lv_area_t * clip_area,
-                     lv_draw_rect_dsc_t * draw_dsc)
+                     const lv_draw_rect_dsc_t * draw_dsc)
 {
     if(point_cnt < 3) return;
     if(points == NULL) return;

src/lv_draw/lv_draw_triangle.h

@@ -33,7 +33,7 @@ extern "C" {
  * @param clip_area the triangle will be drawn only in this area
  * @param draw_dsc pointer to an initialized `lv_draw_rect_dsc_t` variable
  */
-void lv_draw_triangle(const lv_point_t points[], const lv_area_t * clip, lv_draw_rect_dsc_t * draw_dsc);
+void lv_draw_triangle(const lv_point_t points[], const lv_area_t * clip, const lv_draw_rect_dsc_t * draw_dsc);
 
 /**
  * Draw a polygon. Only convex polygons are supported.
@@ -43,7 +43,7 @@ void lv_draw_triangle(const lv_point_t points[], const lv_area_t * clip, lv_draw
  * @param draw_dsc pointer to an initialized `lv_draw_rect_dsc_t` variable
  */
 void lv_draw_polygon(const lv_point_t points[], uint16_t point_cnt, const lv_area_t * mask,
-                     lv_draw_rect_dsc_t * draw_dsc);
+                     const lv_draw_rect_dsc_t * draw_dsc);
 
 /**********************
  *      MACROS

src/lv_draw/lv_img_buf.c

@@ -435,6 +435,10 @@ void _lv_img_buf_transform_init(lv_img_transform_dsc_t * dsc)
     dsc->tmp.sinma = (s1 * (10 - angle_rem) + s2 * angle_rem) / 10;
     dsc->tmp.cosma = (c1 * (10 - angle_rem) + c2 * angle_rem) / 10;
 
+    /*Use smaller value to avoid overflow*/
+    dsc->tmp.sinma = dsc->tmp.sinma >> (LV_TRIGO_SHIFT - _LV_TRANSFORM_TRIGO_SHIFT);
+    dsc->tmp.cosma = dsc->tmp.cosma >> (LV_TRIGO_SHIFT - _LV_TRANSFORM_TRIGO_SHIFT);
+
     dsc->tmp.chroma_keyed = lv_img_cf_is_chroma_keyed(dsc->cfg.cf) ? 1 : 0;
     dsc->tmp.has_alpha = lv_img_cf_has_alpha(dsc->cfg.cf) ? 1 : 0;
     if(dsc->cfg.cf == LV_IMG_CF_TRUE_COLOR || dsc->cfg.cf == LV_IMG_CF_TRUE_COLOR_ALPHA ||
@@ -451,7 +455,9 @@ void _lv_img_buf_transform_init(lv_img_transform_dsc_t * dsc)
     dsc->tmp.img_dsc.header.w = dsc->cfg.src_w;
     dsc->tmp.img_dsc.header.h = dsc->cfg.src_h;
 
-    dsc->tmp.zoom_inv = (256 * 256) / dsc->cfg.zoom;
+    /* The inverse of the zoom will be sued during the transformation
+     *  + dsc->cfg.zoom / 2 for rounding*/
+    dsc->tmp.zoom_inv = (((256 * 256) << _LV_ZOOM_INV_UPSCALE) + dsc->cfg.zoom / 2) / dsc->cfg.zoom;
 
     dsc->res.opa = LV_OPA_COVER;
     dsc->res.color = dsc->cfg.color;
@@ -468,7 +474,7 @@ void _lv_img_buf_transform_init(lv_img_transform_dsc_t * dsc)
  * @param pivot x,y pivot coordinates of rotation
  */
 void _lv_img_buf_get_transformed_area(lv_area_t * res, lv_coord_t w, lv_coord_t h, int16_t angle, uint16_t zoom,
-                                      lv_point_t * pivot)
+                                      const lv_point_t * pivot)
 {
 #if LV_USE_IMG_TRANSFORM
     if(angle == 0 && zoom == LV_IMG_ZOOM_NONE) {
@@ -477,7 +483,20 @@ void _lv_img_buf_get_transformed_area(lv_area_t * res, lv_coord_t w, lv_coord_t
         res->x2 = w - 1;
         res->y2 = h - 1;
         return;
+    }
 
+
+    res->x1 = (((-pivot->x) * zoom) >> 8) - 1;
+    res->y1 = (((-pivot->y) * zoom) >> 8) - 1;
+    res->x2 = (((w - pivot->x) * zoom) >> 8) + 2;
+    res->y2 = (((h - pivot->y) * zoom) >> 8) + 2;
+
+    if(angle == 0) {
+        res->x1 += pivot->x;
+        res->y1 += pivot->y;
+        res->x2 += pivot->x;
+        res->y2 += pivot->y;
+        return;
     }
 
     int32_t angle_low = angle / 10;
@@ -493,6 +512,10 @@ void _lv_img_buf_get_transformed_area(lv_area_t * res, lv_coord_t w, lv_coord_t
     int32_t sinma = (s1 * (10 - angle_rem) + s2 * angle_rem) / 10;
     int32_t cosma = (c1 * (10 - angle_rem) + c2 * angle_rem) / 10;
 
+    /*Use smaller value to avoid overflow*/
+    sinma = sinma >> (LV_TRIGO_SHIFT - _LV_TRANSFORM_TRIGO_SHIFT);
+    cosma = cosma >> (LV_TRIGO_SHIFT - _LV_TRANSFORM_TRIGO_SHIFT);
+
     lv_point_t lt;
     lv_point_t rt;
     lv_point_t lb;
@@ -501,31 +524,25 @@ void _lv_img_buf_get_transformed_area(lv_area_t * res, lv_coord_t w, lv_coord_t
     lv_coord_t xt;
     lv_coord_t yt;
 
-    lv_area_t a;
-    a.x1 = ((-pivot->x) * zoom) >> 8;
-    a.y1 = ((-pivot->y) * zoom) >> 8;
-    a.x2 = ((w - pivot->x) * zoom) >> 8;
-    a.y2 = ((h - pivot->y) * zoom) >> 8;
+    xt = res->x1;
+    yt = res->y1;
+    lt.x = ((cosma * xt - sinma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->x;
+    lt.y = ((sinma * xt + cosma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->y;
 
-    xt = a.x1;
-    yt = a.y1;
-    lt.x = ((cosma * xt - sinma * yt) >> LV_TRIGO_SHIFT) + pivot->x;
-    lt.y = ((sinma * xt + cosma * yt) >> LV_TRIGO_SHIFT) + pivot->y;
+    xt = res->x2;
+    yt = res->y1;
+    rt.x = ((cosma * xt - sinma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->x;
+    rt.y = ((sinma * xt + cosma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->y;
 
-    xt = a.x2;
-    yt = a.y1;
-    rt.x = ((cosma * xt - sinma * yt) >> LV_TRIGO_SHIFT) + pivot->x;
-    rt.y = ((sinma * xt + cosma * yt) >> LV_TRIGO_SHIFT) + pivot->y;
+    xt = res->x1;
+    yt = res->y2;
+    lb.x = ((cosma * xt - sinma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->x;
+    lb.y = ((sinma * xt + cosma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->y;
 
-    xt = a.x1;
-    yt = a.y2;
-    lb.x = ((cosma * xt - sinma * yt) >> LV_TRIGO_SHIFT) + pivot->x;
-    lb.y = ((sinma * xt + cosma * yt) >> LV_TRIGO_SHIFT) + pivot->y;
-
-    xt = a.x2;
-    yt = a.y2;
-    rb.x = ((cosma * xt - sinma * yt) >> LV_TRIGO_SHIFT) + pivot->x;
-    rb.y = ((sinma * xt + cosma * yt) >> LV_TRIGO_SHIFT) + pivot->y;
+    xt = res->x2;
+    yt = res->y2;
+    rb.x = ((cosma * xt - sinma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->x;
+    rb.y = ((sinma * xt + cosma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->y;
 
     res->x1 = LV_MATH_MIN4(lb.x, lt.x, rb.x, rt.x);
     res->x2 = LV_MATH_MAX4(lb.x, lt.x, rb.x, rt.x);

src/lv_draw/lv_img_buf.h

@@ -48,6 +48,9 @@ extern "C" {
 
 #define LV_IMG_ZOOM_NONE   256
 
+#define _LV_TRANSFORM_TRIGO_SHIFT 10
+#define _LV_ZOOM_INV_UPSCALE 5
+
 /**********************
  *      TYPEDEFS
  **********************/
@@ -172,7 +175,7 @@ typedef struct {
         uint8_t has_alpha : 1;
         uint8_t native_color : 1;
 
-        uint16_t zoom_inv;
+        uint32_t zoom_inv;
 
         /*Runtime data*/
         lv_coord_t xs;
@@ -301,20 +304,20 @@ static inline bool _lv_img_buf_transform(lv_img_transform_dsc_t * dsc, lv_coord_
     int32_t ys;
     if(dsc->cfg.zoom == LV_IMG_ZOOM_NONE) {
         /*Get the source pixel from the upscaled image*/
-        xs = ((dsc->tmp.cosma * xt - dsc->tmp.sinma * yt) >> (LV_TRIGO_SHIFT - 8)) + dsc->tmp.pivot_x_256;
-        ys = ((dsc->tmp.sinma * xt + dsc->tmp.cosma * yt) >> (LV_TRIGO_SHIFT - 8)) + dsc->tmp.pivot_y_256;
+        xs = ((dsc->tmp.cosma * xt - dsc->tmp.sinma * yt) >> (_LV_TRANSFORM_TRIGO_SHIFT - 8)) + dsc->tmp.pivot_x_256;
+        ys = ((dsc->tmp.sinma * xt + dsc->tmp.cosma * yt) >> (_LV_TRANSFORM_TRIGO_SHIFT - 8)) + dsc->tmp.pivot_y_256;
     }
     else if(dsc->cfg.angle == 0) {
-        xt *= dsc->tmp.zoom_inv;
-        yt *= dsc->tmp.zoom_inv;
+        xt = (int32_t)((int32_t)xt * dsc->tmp.zoom_inv) >> _LV_ZOOM_INV_UPSCALE;
+        yt = (int32_t)((int32_t)yt * dsc->tmp.zoom_inv) >> _LV_ZOOM_INV_UPSCALE;
         xs = xt + dsc->tmp.pivot_x_256;
         ys = yt + dsc->tmp.pivot_y_256;
     }
     else {
-        xt *= dsc->tmp.zoom_inv;
-        yt *= dsc->tmp.zoom_inv;
-        xs = ((dsc->tmp.cosma * xt - dsc->tmp.sinma * yt) >> (LV_TRIGO_SHIFT)) + dsc->tmp.pivot_x_256;
-        ys = ((dsc->tmp.sinma * xt + dsc->tmp.cosma * yt) >> (LV_TRIGO_SHIFT)) + dsc->tmp.pivot_y_256;
+        xt = (int32_t)((int32_t)xt * dsc->tmp.zoom_inv) >> _LV_ZOOM_INV_UPSCALE;
+        yt = (int32_t)((int32_t)yt * dsc->tmp.zoom_inv) >> _LV_ZOOM_INV_UPSCALE;
+        xs = ((dsc->tmp.cosma * xt - dsc->tmp.sinma * yt) >> (_LV_TRANSFORM_TRIGO_SHIFT)) + dsc->tmp.pivot_x_256;
+        ys = ((dsc->tmp.sinma * xt + dsc->tmp.cosma * yt) >> (_LV_TRANSFORM_TRIGO_SHIFT)) + dsc->tmp.pivot_y_256;
     }
 
     /*Get the integer part of the source pixel*/
@@ -380,7 +383,7 @@ static inline bool _lv_img_buf_transform(lv_img_transform_dsc_t * dsc, lv_coord_
  * @param pivot x,y pivot coordinates of rotation
  */
 void _lv_img_buf_get_transformed_area(lv_area_t * res, lv_coord_t w, lv_coord_t h, int16_t angle, uint16_t zoom,
-                                      lv_point_t * pivot);
+                                      const lv_point_t * pivot);
 
 /**********************
  *      MACROS

src/lv_draw/lv_img_cache.c

@@ -59,7 +59,7 @@ static uint16_t entry_cnt;
  * The image will be left open meaning if the image decoder open callback allocated memory then it will remain.
  * The image is closed if a new image is opened and the new image takes its place in the cache.
  * @param src source of the image. Path to file or pointer to an `lv_img_dsc_t` variable
- * @param style style of the image
+ * @param color color The color of the image with `LV_IMG_CF_ALPHA_...`
  * @return pointer to the cache entry or NULL if can open the image
  */
 lv_img_cache_entry_t * _lv_img_cache_open(const void * src, lv_color_t color)

src/lv_draw/lv_img_cache.h

@@ -46,7 +46,7 @@ typedef struct {
  * The image will be left open meaning if the image decoder open callback allocated memory then it will remain.
  * The image is closed if a new image is opened and the new image takes its place in the cache.
  * @param src source of the image. Path to file or pointer to an `lv_img_dsc_t` variable
- * @param style style of the image
+ * @param color The color of the image with `LV_IMG_CF_ALPHA_...`
  * @return pointer to the cache entry or NULL if can open the image
  */
 lv_img_cache_entry_t * _lv_img_cache_open(const void * src, lv_color_t color);

src/lv_draw/lv_img_decoder.c

@@ -114,7 +114,7 @@ lv_res_t lv_img_decoder_get_info(const char * src, lv_img_header_t * header)
  *  1) File name: E.g. "S:folder/img1.png" (The drivers needs to registered via `lv_fs_add_drv()`)
  *  2) Variable: Pointer to an `lv_img_dsc_t` variable
  *  3) Symbol: E.g. `LV_SYMBOL_OK`
- * @param style the style of the image
+ * @param color The color of the image with `LV_IMG_CF_ALPHA_...`
  * @return LV_RES_OK: opened the image. `dsc->img_data` and `dsc->header` are set.
  *         LV_RES_INV: none of the registered image decoders were able to open the image.
  */
@@ -559,7 +559,7 @@ static lv_res_t lv_img_decoder_built_in_line_true_color(lv_img_decoder_dsc_t * d
     }
     uint32_t btr = len * (px_size >> 3);
     uint32_t br  = 0;
-    lv_fs_read(user_data->f, buf, btr, &br);
+    res = lv_fs_read(user_data->f, buf, btr, &br);
     if(res != LV_FS_RES_OK || btr != br) {
         LV_LOG_WARN("Built-in image decoder read failed");
         return LV_RES_INV;

src/lv_draw/lv_img_decoder.h

@@ -157,7 +157,7 @@ lv_res_t lv_img_decoder_get_info(const char * src, lv_img_header_t * header);
  *  1) File name: E.g. "S:folder/img1.png" (The drivers needs to registered via `lv_fs_add_drv()`)
  *  2) Variable: Pointer to an `lv_img_dsc_t` variable
  *  3) Symbol: E.g. `LV_SYMBOL_OK`
- * @param style the style of the image
+ * @param color The color of the image with `LV_IMG_CF_ALPHA_...`
  * @return LV_RES_OK: opened the image. `dsc->img_data` and `dsc->header` are set.
  *         LV_RES_INV: none of the registered image decoders were able to open the image.
  */

src/lv_font/lv_font.h

@@ -71,6 +71,10 @@ typedef struct _lv_font_struct {
     lv_coord_t line_height;         /**< The real line height where any text fits*/
     lv_coord_t base_line;           /**< Base line measured from the top of the line_height*/
     uint8_t subpx  : 2;             /**< An element of `lv_font_subpx_t`*/
+
+    int8_t underline_position;      /**< Distance between the top of the underline and base line (< 0 means below the base line)*/
+    int8_t  underline_thickness;     /**< Thickness of the underline*/
+
     void * dsc;                     /**< Store implementation specific or run_time data or caching here*/
 #if LV_USE_USER_DATA
     lv_font_user_data_t user_data;  /**< Custom user data for font. */

src/lv_font/lv_font.mk

@@ -1,5 +1,6 @@
 CSRCS += lv_font.c
 CSRCS += lv_font_fmt_txt.c
+CSRCS += lv_font_loader.c
 CSRCS += lv_font_montserrat_12.c
 CSRCS += lv_font_montserrat_14.c
 CSRCS += lv_font_montserrat_16.c

src/lv_font/lv_font_fmt_txt.c

@@ -88,6 +88,7 @@ const uint8_t * lv_font_get_bitmap_fmt_txt(const lv_font_t * font, uint32_t unic
     }
     /*Handle compressed bitmap*/
     else {
+#if LV_USE_FONT_COMPRESSED
         uint32_t gsize = gdsc->box_w * gdsc->box_h;
         if(gsize == 0) return NULL;
 
@@ -118,6 +119,9 @@ const uint8_t * lv_font_get_bitmap_fmt_txt(const lv_font_t * font, uint32_t unic
         decompress(&fdsc->glyph_bitmap[gdsc->bitmap_index], decompr_buf, gdsc->box_w, gdsc->box_h, (uint8_t)fdsc->bpp,
                    prefilter);
         return decompr_buf;
+#else /* !LV_USE_FONT_COMPRESSED */
+        return NULL;
+#endif
     }
 
     /*If not returned earlier then the letter is not found in this font*/

src/lv_font/lv_font_loader.c

@@ -0,0 +1,694 @@
+/**
+ * @file lv_font_loader.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "../lvgl.h"
+#include "../lv_misc/lv_fs.h"
+#include "lv_font_loader.h"
+
+#if LV_USE_FILESYSTEM
+
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+typedef struct {
+    lv_fs_file_t * fp;
+    int8_t bit_pos;
+    uint8_t byte_value;
+} bit_iterator_t;
+
+typedef struct font_header_bin {
+    uint32_t version;
+    uint16_t tables_count;
+    uint16_t font_size;
+    uint16_t ascent;
+    int16_t descent;
+    uint16_t typo_ascent;
+    int16_t typo_descent;
+    uint16_t typo_line_gap;
+    int16_t min_y;
+    int16_t max_y;
+    uint16_t default_advance_width;
+    uint16_t kerning_scale;
+    uint8_t index_to_loc_format;
+    uint8_t glyph_id_format;
+    uint8_t advance_width_format;
+    uint8_t bits_per_pixel;
+    uint8_t xy_bits;
+    uint8_t wh_bits;
+    uint8_t advance_width_bits;
+    uint8_t compression_id;
+    uint8_t subpixels_mode;
+    uint8_t padding;
+} font_header_bin_t;
+
+typedef struct cmap_table_bin {
+    uint32_t data_offset;
+    uint32_t range_start;
+    uint16_t range_length;
+    uint16_t glyph_id_start;
+    uint16_t data_entries_count;
+    uint8_t format_type;
+    uint8_t padding;
+} cmap_table_bin_t;
+
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static bit_iterator_t init_bit_iterator(lv_fs_file_t * fp);
+static bool lvgl_load_font(lv_fs_file_t * fp, lv_font_t * font);
+int32_t load_kern(lv_fs_file_t * fp, lv_font_fmt_txt_dsc_t * font_dsc, uint8_t format, uint32_t start);
+
+static int read_bits_signed(bit_iterator_t * it, int n_bits, lv_fs_res_t * res);
+static int read_bits(bit_iterator_t * it, int n_bits, lv_fs_res_t * res);
+
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Loads a `lv_font_t` object from a binary font file
+ * @param font_name filename where the font file is located
+ * @return a pointer to the font or NULL in case of error
+ */
+lv_font_t * lv_font_load(const char * font_name)
+{
+    bool success = false;
+
+    lv_font_t * font = lv_mem_alloc(sizeof(lv_font_t));
+    memset(font, 0, sizeof(lv_font_t));
+
+    lv_fs_file_t file;
+    lv_fs_res_t res = lv_fs_open(&file, font_name, LV_FS_MODE_RD);
+
+    if(res == LV_FS_RES_OK) {
+        success = lvgl_load_font(&file, font);
+    }
+
+    if(!success) {
+        LV_LOG_WARN("Error loading font file: %s\n", font_name);
+        /*
+         * When `lvgl_load_font` fails it can leak some pointers.
+         * All non-null pointers can be assumed as allocated and
+         * `lv_font_free` should free them correctly.
+         */
+        lv_font_free(font);
+        font = NULL;
+    }
+
+    lv_fs_close(&file);
+
+    return font;
+}
+
+
+/**
+ * Frees the memory allocated by the `lv_font_load()` function
+ * @param font lv_font_t object created by the lv_font_load function
+ */
+void lv_font_free(lv_font_t * font)
+{
+    if(NULL != font) {
+        lv_font_fmt_txt_dsc_t * dsc = (lv_font_fmt_txt_dsc_t *) font->dsc;
+
+        if(NULL != dsc) {
+
+            if(dsc->kern_classes == 0) {
+                lv_font_fmt_txt_kern_pair_t * kern_dsc =
+                    (lv_font_fmt_txt_kern_pair_t *) dsc->kern_dsc;
+
+                if(NULL != kern_dsc) {
+                    if(kern_dsc->glyph_ids)
+                        lv_mem_free((void *) kern_dsc->glyph_ids);
+
+                    if(kern_dsc->values)
+                        lv_mem_free((void *) kern_dsc->values);
+
+                    lv_mem_free((void *) kern_dsc);
+                }
+            }
+            else {
+                lv_font_fmt_txt_kern_classes_t * kern_dsc =
+                    (lv_font_fmt_txt_kern_classes_t *) dsc->kern_dsc;
+
+                if(NULL != kern_dsc) {
+                    if(kern_dsc->class_pair_values)
+                        lv_mem_free((void *) kern_dsc->class_pair_values);
+
+                    if(kern_dsc->left_class_mapping)
+                        lv_mem_free((void *) kern_dsc->left_class_mapping);
+
+                    if(kern_dsc->right_class_mapping)
+                        lv_mem_free((void *) kern_dsc->right_class_mapping);
+
+                    lv_mem_free((void *) kern_dsc);
+                }
+            }
+
+            lv_font_fmt_txt_cmap_t * cmaps =
+                (lv_font_fmt_txt_cmap_t *) dsc->cmaps;
+
+            if(NULL != cmaps) {
+                for(int i = 0; i < dsc->cmap_num; ++i) {
+                    if(NULL != cmaps[i].glyph_id_ofs_list)
+                        lv_mem_free((void *) cmaps[i].glyph_id_ofs_list);
+                    if(NULL != cmaps[i].unicode_list)
+                        lv_mem_free((void *) cmaps[i].unicode_list);
+                }
+                lv_mem_free(cmaps);
+            }
+
+            if(NULL != dsc->glyph_bitmap) {
+                lv_mem_free((void *) dsc->glyph_bitmap);
+            }
+            if(NULL != dsc->glyph_dsc) {
+                lv_mem_free((void *) dsc->glyph_dsc);
+            }
+            lv_mem_free(dsc);
+        }
+        lv_mem_free(font);
+    }
+}
+
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+static bit_iterator_t init_bit_iterator(lv_fs_file_t * fp)
+{
+    bit_iterator_t it;
+    it.fp = fp;
+    it.bit_pos = -1;
+    it.byte_value = 0;
+    return it;
+}
+
+static int read_bits(bit_iterator_t * it, int n_bits, lv_fs_res_t * res)
+{
+    int value = 0;
+    while(n_bits--) {
+        it->byte_value = it->byte_value << 1;
+        it->bit_pos--;
+
+        if(it->bit_pos < 0) {
+            it->bit_pos = 7;
+            *res = lv_fs_read(it->fp, &(it->byte_value), 1, NULL);
+            if(*res != LV_FS_RES_OK) {
+                return -1;
+            }
+        }
+        int8_t bit = (it->byte_value & 0x80) ? 1 : 0;
+
+        value |= (bit << n_bits);
+    }
+    *res = LV_FS_RES_OK;
+    return value;
+}
+
+static int read_bits_signed(bit_iterator_t * it, int n_bits, lv_fs_res_t * res)
+{
+    int value = read_bits(it, n_bits, res);
+    if(value & (1 << (n_bits - 1))) {
+        for(int bit = n_bits; bit < 8; ++bit) {
+            value |= (1 << bit);
+        }
+    }
+    return value;
+}
+
+static int read_label(lv_fs_file_t * fp, int start, const char * label)
+{
+    lv_fs_seek(fp, start);
+
+    uint32_t length;
+    char buf[4];
+
+    if(lv_fs_read(fp, &length, 4, NULL) != LV_FS_RES_OK
+       || lv_fs_read(fp, buf, 4, NULL) != LV_FS_RES_OK
+       || memcmp(label, buf, 4) != 0) {
+        LV_LOG_WARN("Error reading '%s' label.", label);
+        return -1;
+    }
+
+    return length;
+}
+
+static bool load_cmaps_tables(lv_fs_file_t * fp, lv_font_fmt_txt_dsc_t * font_dsc,
+                              uint32_t cmaps_start, cmap_table_bin_t * cmap_table)
+{
+    for(unsigned int i = 0; i < font_dsc->cmap_num; ++i) {
+        if(lv_fs_read(fp, &cmap_table[i], sizeof(cmap_table_bin_t), NULL) != LV_FS_RES_OK) {
+            return false;
+        }
+
+        lv_font_fmt_txt_cmap_t * cmap = (lv_font_fmt_txt_cmap_t *) & (font_dsc->cmaps[i]);
+
+        cmap->range_start = cmap_table[i].range_start;
+        cmap->range_length = cmap_table[i].range_length;
+        cmap->glyph_id_start = cmap_table[i].glyph_id_start;
+    }
+
+    for(unsigned int i = 0; i < font_dsc->cmap_num; ++i) {
+        lv_fs_res_t res = lv_fs_seek(fp, cmaps_start + cmap_table[i].data_offset);
+        if(res != LV_FS_RES_OK) {
+            return false;
+        }
+
+        lv_font_fmt_txt_cmap_t * cmap = (lv_font_fmt_txt_cmap_t *) & (font_dsc->cmaps[i]);
+
+        switch(cmap_table[i].format_type) {
+            case 0: {
+                    uint8_t ids_size = sizeof(uint8_t) * cmap_table[i].data_entries_count;
+                    uint8_t * glyph_id_ofs_list = lv_mem_alloc(ids_size);
+
+                    cmap->glyph_id_ofs_list = glyph_id_ofs_list;
+
+                    if(lv_fs_read(fp, glyph_id_ofs_list, ids_size, NULL) != LV_FS_RES_OK) {
+                        return false;
+                    }
+
+                    cmap->type = LV_FONT_FMT_TXT_CMAP_FORMAT0_FULL;
+                    cmap->list_length = cmap->range_length;
+                    cmap->unicode_list = NULL;
+                    break;
+                }
+            case 2:
+                cmap->type = LV_FONT_FMT_TXT_CMAP_FORMAT0_TINY;
+                cmap->list_length = 0;
+                cmap->unicode_list = NULL;
+                cmap->glyph_id_ofs_list = NULL;
+                break;
+            case 1:
+            case 3: {
+                    uint32_t list_size = sizeof(uint16_t) * cmap_table[i].data_entries_count;
+                    uint16_t * unicode_list = (uint16_t *) lv_mem_alloc(list_size);
+
+                    cmap->unicode_list = unicode_list;
+                    cmap->list_length = cmap_table[i].data_entries_count;
+
+                    if(lv_fs_read(fp, unicode_list, list_size, NULL) != LV_FS_RES_OK) {
+                        return false;
+                    }
+
+                    if(cmap_table[i].format_type == 1) {
+                        uint16_t * buf = lv_mem_alloc(sizeof(uint16_t) * cmap->list_length);
+
+                        cmap->type = LV_FONT_FMT_TXT_CMAP_SPARSE_FULL;
+                        cmap->glyph_id_ofs_list = buf;
+
+                        if(lv_fs_read(fp, buf, sizeof(uint16_t) * cmap->list_length, NULL) != LV_FS_RES_OK) {
+                            return false;
+                        }
+                    }
+                    else {
+                        cmap->type = LV_FONT_FMT_TXT_CMAP_SPARSE_TINY;
+                        cmap->glyph_id_ofs_list = NULL;
+                    }
+                    break;
+                }
+            default:
+                LV_LOG_WARN("Unknown cmaps format type %d.", cmap_table[i].format_type);
+                return false;
+        }
+    }
+    return true;
+}
+
+static int32_t load_cmaps(lv_fs_file_t * fp, lv_font_fmt_txt_dsc_t * font_dsc, uint32_t cmaps_start)
+{
+    int32_t cmaps_length = read_label(fp, cmaps_start, "cmap");
+    if(cmaps_length < 0) {
+        return -1;
+    }
+
+    uint32_t cmaps_subtables_count;
+    if(lv_fs_read(fp, &cmaps_subtables_count, sizeof(uint32_t), NULL) != LV_FS_RES_OK) {
+        return -1;
+    }
+
+    lv_font_fmt_txt_cmap_t * cmaps =
+        lv_mem_alloc(cmaps_subtables_count * sizeof(lv_font_fmt_txt_cmap_t));
+
+    memset(cmaps, 0, cmaps_subtables_count * sizeof(lv_font_fmt_txt_cmap_t));
+
+    font_dsc->cmaps = cmaps;
+    font_dsc->cmap_num = cmaps_subtables_count;
+
+    cmap_table_bin_t * cmaps_tables = lv_mem_alloc(sizeof(cmap_table_bin_t) * font_dsc->cmap_num);
+
+    bool success = load_cmaps_tables(fp, font_dsc, cmaps_start, cmaps_tables);
+
+    lv_mem_free(cmaps_tables);
+
+    return success ? cmaps_length : -1;
+}
+
+static int32_t load_glyph(lv_fs_file_t * fp, lv_font_fmt_txt_dsc_t * font_dsc,
+                          uint32_t start, uint32_t * glyph_offset, uint32_t loca_count, font_header_bin_t * header)
+{
+    int32_t glyph_length = read_label(fp, start, "glyf");
+    if(glyph_length < 0) {
+        return -1;
+    }
+
+    lv_font_fmt_txt_glyph_dsc_t * glyph_dsc = (lv_font_fmt_txt_glyph_dsc_t *)
+                                              lv_mem_alloc(loca_count * sizeof(lv_font_fmt_txt_glyph_dsc_t));
+
+    memset(glyph_dsc, 0, loca_count * sizeof(lv_font_fmt_txt_glyph_dsc_t));
+
+    font_dsc->glyph_dsc = glyph_dsc;
+
+    int cur_bmp_size = 0;
+
+    for(unsigned int i = 0; i < loca_count; ++i) {
+        lv_font_fmt_txt_glyph_dsc_t * gdsc = &glyph_dsc[i];
+
+        lv_fs_res_t res = lv_fs_seek(fp, start + glyph_offset[i]);
+        if(res != LV_FS_RES_OK) {
+            return -1;
+        }
+
+        bit_iterator_t bit_it = init_bit_iterator(fp);
+
+        if(header->advance_width_bits == 0) {
+            gdsc->adv_w = header->default_advance_width;
+        }
+        else {
+            gdsc->adv_w = read_bits(&bit_it, header->advance_width_bits, &res);
+            if(res != LV_FS_RES_OK) {
+                return -1;
+            }
+        }
+
+        if(header->advance_width_format == 0) {
+            gdsc->adv_w *= 16;
+        }
+
+        gdsc->ofs_x = read_bits_signed(&bit_it, header->xy_bits, &res);
+        if(res != LV_FS_RES_OK) {
+            return -1;
+        }
+
+        gdsc->ofs_y = read_bits_signed(&bit_it, header->xy_bits, &res);
+        if(res != LV_FS_RES_OK) {
+            return -1;
+        }
+
+        gdsc->box_w = read_bits(&bit_it, header->wh_bits, &res);
+        if(res != LV_FS_RES_OK) {
+            return -1;
+        }
+
+        gdsc->box_h = read_bits(&bit_it, header->wh_bits, &res);
+        if(res != LV_FS_RES_OK) {
+            return -1;
+        }
+
+        int nbits = header->advance_width_bits + 2 * header->xy_bits + 2 * header->wh_bits;
+        int next_offset = (i < loca_count - 1) ? glyph_offset[i + 1] : (uint32_t)(glyph_length - 1);
+        int bmp_size = next_offset - glyph_offset[i] - nbits / 8;
+
+        if(i == 0) {
+            gdsc->adv_w = 0;
+            gdsc->box_w = 0;
+            gdsc->box_h = 0;
+            gdsc->ofs_x = 0;
+            gdsc->ofs_y = 0;
+        }
+
+        gdsc->bitmap_index = cur_bmp_size;
+        if(gdsc->box_w * gdsc->box_h != 0) {
+            cur_bmp_size += bmp_size;
+        }
+    }
+
+    uint8_t * glyph_bmp = (uint8_t *) lv_mem_alloc(sizeof(uint8_t) * cur_bmp_size);
+
+    font_dsc->glyph_bitmap = glyph_bmp;
+
+    cur_bmp_size = 0;
+
+    for(unsigned int i = 1; i < loca_count; ++i) {
+        lv_fs_res_t res = lv_fs_seek(fp, start + glyph_offset[i]);
+        if(res != LV_FS_RES_OK) {
+            return -1;
+        }
+        bit_iterator_t bit_it = init_bit_iterator(fp);
+
+        int nbits = header->advance_width_bits + 2 * header->xy_bits + 2 * header->wh_bits;
+
+        read_bits(&bit_it, nbits, &res);
+        if(res != LV_FS_RES_OK) {
+            return -1;
+        }
+
+        if(glyph_dsc[i].box_w * glyph_dsc[i].box_h == 0) {
+            continue;
+        }
+
+        int next_offset = (i < loca_count - 1) ? glyph_offset[i + 1] : (uint32_t)(glyph_length - 1);
+        int bmp_size = next_offset - glyph_offset[i] - nbits / 8;
+
+        for(int k = 0; k < bmp_size; ++k) {
+            glyph_bmp[cur_bmp_size + k] = read_bits(&bit_it, 8, &res);
+            if(res != LV_FS_RES_OK) {
+                return -1;
+            }
+        }
+        cur_bmp_size += bmp_size;
+    }
+    return glyph_length;
+}
+
+/*
+ * Loads a `lv_font_t` from a binary file, given a `lv_fs_file_t`.
+ *
+ * Memory allocations on `lvgl_load_font` should be immediately zeroed and
+ * the pointer should be set on the `lv_font_t` data before any possible return.
+ *
+ * When something fails, it returns `false` and the memory on the `lv_font_t`
+ * still needs to be freed using `lv_font_free`.
+ *
+ * `lv_font_free` will assume that all non-null pointers are allocated and
+ * should be freed.
+ */
+static bool lvgl_load_font(lv_fs_file_t * fp, lv_font_t * font)
+{
+    lv_font_fmt_txt_dsc_t * font_dsc = (lv_font_fmt_txt_dsc_t *)
+                                       lv_mem_alloc(sizeof(lv_font_fmt_txt_dsc_t));
+
+    memset(font_dsc, 0, sizeof(lv_font_fmt_txt_dsc_t));
+
+    font->dsc = font_dsc;
+
+    /* header */
+    int32_t header_length = read_label(fp, 0, "head");
+    if(header_length < 0) {
+        return false;
+    }
+
+    font_header_bin_t font_header;
+    if(lv_fs_read(fp, &font_header, sizeof(font_header_bin_t), NULL) != LV_FS_RES_OK) {
+        return false;
+    }
+
+    font->base_line = -font_header.descent;
+    font->line_height = font_header.ascent - font_header.descent;
+    font->get_glyph_dsc = lv_font_get_glyph_dsc_fmt_txt;
+    font->get_glyph_bitmap = lv_font_get_bitmap_fmt_txt;
+    font->subpx = LV_FONT_SUBPX_NONE;
+
+    font_dsc->bpp = font_header.bits_per_pixel;
+    font_dsc->kern_scale = font_header.kerning_scale;
+    font_dsc->bitmap_format = font_header.compression_id;
+
+    /* cmaps */
+    uint32_t cmaps_start = header_length;
+    int32_t cmaps_length = load_cmaps(fp, font_dsc, cmaps_start);
+    if(cmaps_length < 0) {
+        return false;
+    }
+
+    /* loca */
+    uint32_t loca_start = cmaps_start + cmaps_length;
+    int32_t loca_length = read_label(fp, loca_start, "loca");
+    if(loca_length < 0) {
+        return false;
+    }
+
+    uint32_t loca_count;
+    if(lv_fs_read(fp, &loca_count, sizeof(uint32_t), NULL) != LV_FS_RES_OK) {
+        return false;
+    }
+
+    bool failed = false;
+    uint32_t * glyph_offset = lv_mem_alloc(sizeof(uint32_t) * (loca_count + 1));
+
+    for(unsigned int i = 0; i < loca_count; ++i) {
+        if(font_header.index_to_loc_format == 0) {
+            uint16_t offset;
+            if(lv_fs_read(fp, &offset, sizeof(uint16_t), NULL) != LV_FS_RES_OK) {
+                failed = true;
+                break;
+            }
+            glyph_offset[i] = offset;
+        }
+        else if(font_header.index_to_loc_format == 1) {
+            uint32_t offset;
+            if(lv_fs_read(fp, &offset, sizeof(uint32_t), NULL) != LV_FS_RES_OK) {
+                failed = true;
+                break;
+            }
+            glyph_offset[i] = offset;
+        }
+        else {
+            LV_LOG_WARN("Unknown index_to_loc_format: %d.", font_header.index_to_loc_format);
+            failed = true;
+            break;
+        }
+    }
+
+    if(failed) {
+        lv_mem_free(glyph_offset);
+        return false;
+    }
+
+    /* glyph */
+    uint32_t glyph_start = loca_start + loca_length;
+    int32_t glyph_length = load_glyph(
+                               fp, font_dsc, glyph_start, glyph_offset, loca_count, &font_header);
+
+    lv_mem_free(glyph_offset);
+
+    if(glyph_length < 0) {
+        return false;
+    }
+
+    if(font_header.tables_count < 4) {
+        font_dsc->kern_dsc = NULL;
+        font_dsc->kern_classes = 0;
+        font_dsc->kern_scale = 0;
+        return true;
+    }
+
+    uint32_t kern_start = glyph_start + glyph_length;
+
+    int32_t kern_length = load_kern(fp, font_dsc, font_header.glyph_id_format, kern_start);
+
+    return kern_length >= 0;
+}
+
+int32_t load_kern(lv_fs_file_t * fp, lv_font_fmt_txt_dsc_t * font_dsc, uint8_t format, uint32_t start)
+{
+    int32_t kern_length = read_label(fp, start, "kern");
+    if(kern_length < 0) {
+        return -1;
+    }
+
+    uint8_t kern_format_type;
+    int32_t padding;
+    if(lv_fs_read(fp, &kern_format_type, sizeof(uint8_t), NULL) != LV_FS_RES_OK ||
+       lv_fs_read(fp, &padding, 3 * sizeof(uint8_t), NULL) != LV_FS_RES_OK) {
+        return -1;
+    }
+
+    if(0 == kern_format_type) { /* sorted pairs */
+        lv_font_fmt_txt_kern_pair_t * kern_pair = lv_mem_alloc(sizeof(lv_font_fmt_txt_kern_pair_t));
+
+        memset(kern_pair, 0, sizeof(lv_font_fmt_txt_kern_pair_t));
+
+        font_dsc->kern_dsc = kern_pair;
+        font_dsc->kern_classes = 0;
+
+        uint32_t glyph_entries;
+        if(lv_fs_read(fp, &glyph_entries, sizeof(uint32_t), NULL) != LV_FS_RES_OK) {
+            return -1;
+        }
+
+        int ids_size;
+        if(format == 0) {
+            ids_size = sizeof(int8_t) * 2 * glyph_entries;
+        }
+        else {
+            ids_size = sizeof(int16_t) * 2 * glyph_entries;
+        }
+
+        uint8_t * glyph_ids = lv_mem_alloc(ids_size);
+        int8_t * values = lv_mem_alloc(glyph_entries);
+
+        kern_pair->glyph_ids_size = format;
+        kern_pair->pair_cnt = glyph_entries;
+        kern_pair->glyph_ids = glyph_ids;
+        kern_pair->values = values;
+
+        if(lv_fs_read(fp, glyph_ids, ids_size, NULL) != LV_FS_RES_OK) {
+            return -1;
+        }
+
+        if(lv_fs_read(fp, values, glyph_entries, NULL) != LV_FS_RES_OK) {
+            return -1;
+        }
+    }
+    else if(3 == kern_format_type) { /* array M*N of classes */
+
+        lv_font_fmt_txt_kern_classes_t * kern_classes = lv_mem_alloc(sizeof(lv_font_fmt_txt_kern_classes_t));
+
+        memset(kern_classes, 0, sizeof(lv_font_fmt_txt_kern_classes_t));
+
+        font_dsc->kern_dsc = kern_classes;
+        font_dsc->kern_classes = 1;
+
+        uint16_t kern_class_mapping_length;
+        uint8_t kern_table_rows;
+        uint8_t kern_table_cols;
+
+        if(lv_fs_read(fp, &kern_class_mapping_length, sizeof(uint16_t), NULL) != LV_FS_RES_OK ||
+           lv_fs_read(fp, &kern_table_rows, sizeof(uint8_t), NULL) != LV_FS_RES_OK ||
+           lv_fs_read(fp, &kern_table_cols, sizeof(uint8_t), NULL) != LV_FS_RES_OK) {
+            return -1;
+        }
+
+        int kern_values_length = sizeof(int8_t) * kern_table_rows * kern_table_cols;
+
+        uint8_t * kern_left = lv_mem_alloc(kern_class_mapping_length);
+        uint8_t * kern_right = lv_mem_alloc(kern_class_mapping_length);
+        int8_t * kern_values = lv_mem_alloc(kern_values_length);
+
+        kern_classes->left_class_mapping  = kern_left;
+        kern_classes->right_class_mapping = kern_right;
+        kern_classes->left_class_cnt = kern_table_rows;
+        kern_classes->right_class_cnt = kern_table_cols;
+        kern_classes->class_pair_values = kern_values;
+
+        if(lv_fs_read(fp, kern_left, kern_class_mapping_length, NULL) != LV_FS_RES_OK ||
+           lv_fs_read(fp, kern_right, kern_class_mapping_length, NULL) != LV_FS_RES_OK ||
+           lv_fs_read(fp, kern_values, kern_values_length, NULL) != LV_FS_RES_OK) {
+            return -1;
+        }
+    }
+    else {
+        LV_LOG_WARN("Unknown kern_format_type: %d", kern_format_type);
+        return -1;
+    }
+
+    return kern_length;
+}
+
+#endif /*LV_USE_FILESYSTEM*/
+

src/lv_font/lv_font_loader.h

@@ -0,0 +1,44 @@
+/**
+ * @file lv_font_loader.h
+ *
+ */
+
+#ifndef LV_FONT_LOADER_H
+#define LV_FONT_LOADER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+#if LV_USE_FILESYSTEM
+
+lv_font_t * lv_font_load(const char * fontName);
+void lv_font_free(lv_font_t * font);
+
+#endif
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /*LV_FONT_LOADER_H*/

src/lv_misc/lv_anim.c

@@ -475,8 +475,11 @@ static void anim_task(lv_task_t * param)
                 if(a->path.cb) new_value = a->path.cb(&a->path, a);
                 else new_value = lv_anim_path_linear(&a->path, a);
 
-                /*Apply the calculated value*/
-                if(a->exec_cb) a->exec_cb(a->var, new_value);
+                if(new_value != a->current) {
+                    a->current = new_value;
+                    /*Apply the calculated value*/
+                    if(a->exec_cb) a->exec_cb(a->var, new_value);
+                }
 
                 /*If the time is elapsed the animation is ready*/
                 if(a->act_time >= a->time) {

src/lv_misc/lv_anim.h

@@ -82,6 +82,7 @@ typedef struct _lv_anim_t {
     lv_anim_ready_cb_t ready_cb; /**< Call it when the animation is ready*/
     lv_anim_path_t path;         /**< Describe the path (curve) of animations*/
     int32_t start;               /**< Start value*/
+    int32_t current;             /**< Current value */
     int32_t end;                 /**< End value*/
     int32_t time;               /**< Animation time in ms*/
     int32_t act_time;            /**< Current time in animation. Set to negative to make delay.*/
@@ -171,6 +172,7 @@ static inline void lv_anim_set_delay(lv_anim_t * a, uint32_t delay)
 static inline void lv_anim_set_values(lv_anim_t * a, lv_anim_value_t start, lv_anim_value_t end)
 {
     a->start = start;
+    a->current = start;
     a->end   = end;
 }
 

src/lv_misc/lv_color.h

@@ -596,19 +596,26 @@ static inline uint8_t lv_color_brightness(lv_color_t color)
     return (uint8_t)(bright >> 3);
 }
 
+#ifdef __cplusplus
+/* Fix of msvc 2019 compiler error C4576 inside C++ code */
+#define _LV_COLOR_MAKE_TYPE_HELPER lv_color_t
+#else
+#define _LV_COLOR_MAKE_TYPE_HELPER (lv_color_t)
+#endif
+
 /* The most simple macro to create a color from R,G and B values */
 #if LV_COLOR_DEPTH == 1
-#define LV_COLOR_MAKE(r8, g8, b8) ((lv_color_t){.full = (uint8_t)((b8 >> 7) | (g8 >> 7) | (r8 >> 7))})
+#define LV_COLOR_MAKE(r8, g8, b8) (_LV_COLOR_MAKE_TYPE_HELPER{.full = (uint8_t)((b8 >> 7) | (g8 >> 7) | (r8 >> 7))})
 #elif LV_COLOR_DEPTH == 8
-#define LV_COLOR_MAKE(r8, g8, b8) ((lv_color_t){{(uint8_t)((b8 >> 6) & 0x3U), (uint8_t)((g8 >> 5) & 0x7U), (uint8_t)((r8 >> 5) & 0x7U)}})
+#define LV_COLOR_MAKE(r8, g8, b8) (_LV_COLOR_MAKE_TYPE_HELPER{{(uint8_t)((b8 >> 6) & 0x3U), (uint8_t)((g8 >> 5) & 0x7U), (uint8_t)((r8 >> 5) & 0x7U)}})
 #elif LV_COLOR_DEPTH == 16
 #if LV_COLOR_16_SWAP == 0
-#define LV_COLOR_MAKE(r8, g8, b8) ((lv_color_t){{(uint16_t)((b8 >> 3) & 0x1FU), (uint16_t)((g8 >> 2) & 0x3FU), (uint16_t)((r8 >> 3) & 0x1FU)}})
+#define LV_COLOR_MAKE(r8, g8, b8) (_LV_COLOR_MAKE_TYPE_HELPER{{(uint16_t)((b8 >> 3) & 0x1FU), (uint16_t)((g8 >> 2) & 0x3FU), (uint16_t)((r8 >> 3) & 0x1FU)}})
 #else
-#define LV_COLOR_MAKE(r8, g8, b8) ((lv_color_t){{(uint16_t)((g8 >> 5) & 0x7U), (uint16_t)((r8 >> 3) & 0x1FU), (uint16_t)((b8 >> 3) & 0x1FU), (uint16_t)((g8 >> 2) & 0x7U)}})
+#define LV_COLOR_MAKE(r8, g8, b8) (_LV_COLOR_MAKE_TYPE_HELPER{{(uint16_t)((g8 >> 5) & 0x7U), (uint16_t)((r8 >> 3) & 0x1FU), (uint16_t)((b8 >> 3) & 0x1FU), (uint16_t)((g8 >> 2) & 0x7U)}})
 #endif
 #elif LV_COLOR_DEPTH == 32
-#define LV_COLOR_MAKE(r8, g8, b8) ((lv_color_t){{b8, g8, r8, 0xff}}) /*Fix 0xff alpha*/
+#define LV_COLOR_MAKE(r8, g8, b8) (_LV_COLOR_MAKE_TYPE_HELPER{{b8, g8, r8, 0xff}}) /*Fix 0xff alpha*/
 #endif
 
 static inline lv_color_t lv_color_make(uint8_t r, uint8_t g, uint8_t b)

src/lv_misc/lv_math.c

@@ -128,7 +128,6 @@ LV_ATTRIBUTE_FAST_MEM void _lv_sqrt(uint32_t x, lv_sqrt_res_t * q, uint32_t mask
     q->f = (uint32_t)(root & 0xf) << 4;
 }
 
-
 /**
  * Calculate the atan2 of a vector.
  * @param x
@@ -232,6 +231,32 @@ int64_t _lv_pow(int64_t base, int8_t exp)
     return result;
 }
 
+/**
+ * Get the mapped of a number given an input and output range
+ * @param x integer which mapped value should be calculated
+ * @param min_in min input range
+ * @param max_in max input range
+ * @param min_out max output range
+ * @param max_out max output range
+ * @return the mapped number
+ */
+int16_t _lv_map(int32_t x, int32_t min_in, int32_t max_in, int32_t min_out, int32_t max_out)
+{
+    if(x <= min_in) return min_out;
+    if(x >= max_in) return max_out;
+
+    /* The equation should be:
+     *   ((x - min_in) / delta in) * delta_out + min_out
+     * To avoid rounding error reorder the operations:
+     *   (((x - min_in) * delta_out) / delta in) + min_out
+     */
+
+    int32_t delta_in = max_in - min_in;
+    int32_t delta_out = max_out - min_out;
+
+    return ((x - min_in) * delta_out) / delta_in + min_out;
+}
+
 /**********************
  *   STATIC FUNCTIONS
  **********************/

src/lv_misc/lv_math.h

@@ -112,6 +112,17 @@ LV_ATTRIBUTE_FAST_MEM void _lv_sqrt(uint32_t x, lv_sqrt_res_t * q, uint32_t mask
  */
 int64_t _lv_pow(int64_t base, int8_t exp);
 
+/**
+ * Get the mapped of a number given an input and output range
+ * @param x integer which mapped value should be calculated
+ * @param min_in min input range
+ * @param max_in max input range
+ * @param min_out max output range
+ * @param max_out max output range
+ * @return the mapped number
+ */
+int16_t _lv_map(int32_t x, int32_t min_in, int32_t max_in, int32_t min, int32_t max);
+
 /**********************
  *      MACROS
  **********************/

src/lv_misc/lv_mem.c

@@ -586,6 +586,7 @@ void _lv_mem_buf_free_all(void)
     }
 }
 
+#if LV_MEMCPY_MEMSET_STD == 0
 /**
  * Same as `memcpy` but optimized for 4 byte operation.
  * @param dst pointer to the destination buffer
@@ -652,7 +653,6 @@ LV_ATTRIBUTE_FAST_MEM void * _lv_memcpy(void * dst, const void * src, size_t len
 
 /**
  * Same as `memset` but optimized for 4 byte operation.
- * `dst` should be word aligned else normal `memcpy` will be used
  * @param dst pointer to the destination buffer
  * @param v value to set [0..255]
  * @param len number of byte to set
@@ -707,7 +707,6 @@ LV_ATTRIBUTE_FAST_MEM void _lv_memset(void * dst, uint8_t v, size_t len)
 
 /**
  * Same as `memset(dst, 0x00, len)` but optimized for 4 byte operation.
- * `dst` should be word aligned else normal `memcpy` will be used
  * @param dst pointer to the destination buffer
  * @param len number of byte to set
  */
@@ -757,7 +756,6 @@ LV_ATTRIBUTE_FAST_MEM void _lv_memset_00(void * dst, size_t len)
 
 /**
  * Same as `memset(dst, 0xFF, len)` but optimized for 4 byte operation.
- * `dst` should be word aligned else normal `memcpy` will be used
  * @param dst pointer to the destination buffer
  * @param len number of byte to set
  */
@@ -805,6 +803,7 @@ LV_ATTRIBUTE_FAST_MEM void _lv_memset_ff(void * dst, size_t len)
     }
 }
 
+#endif /*LV_MEMCPY_MEMSET_STD*/
 
 /**********************
  *   STATIC FUNCTIONS

src/lv_misc/lv_mem.h

@@ -20,6 +20,10 @@ extern "C" {
 #include "lv_log.h"
 #include "lv_types.h"
 
+#if LV_MEMCPY_MEMSET_STD
+#include <string.h>
+#endif
+
 /*********************
  *      DEFINES
  *********************/
@@ -137,6 +141,62 @@ void _lv_mem_buf_free_all(void);
 
 //! @cond Doxygen_Suppress
 
+#if LV_MEMCPY_MEMSET_STD
+
+/**
+ * Wrapper for the standard memcpy
+ * @param dst pointer to the destination buffer
+ * @param src pointer to the source buffer
+ * @param len number of byte to copy
+ */
+static inline void * _lv_memcpy(void * dst, const void * src, size_t len)
+{
+    return memcpy(dst, src, len);
+}
+
+/**
+ * Wrapper for the standard memcpy
+ * @param dst pointer to the destination buffer
+ * @param src pointer to the source buffer
+ * @param len number of byte to copy
+ */
+static inline void * _lv_memcpy_small(void * dst, const void * src, size_t len)
+{
+    return memcpy(dst, src, len);
+}
+
+/**
+ * Wrapper for the standard memset
+ * @param dst pointer to the destination buffer
+ * @param v value to set [0..255]
+ * @param len number of byte to set
+ */
+static inline void _lv_memset(void * dst, uint8_t v, size_t len)
+{
+    memset(dst, v, len);
+}
+
+/**
+ * Wrapper for the standard memset with fixed 0x00 value
+ * @param dst pointer to the destination buffer
+ * @param len number of byte to set
+ */
+static inline void _lv_memset_00(void * dst, size_t len)
+{
+    memset(dst, 0x00, len);
+}
+
+/**
+ * Wrapper for the standard memset with fixed 0xFF value
+ * @param dst pointer to the destination buffer
+ * @param len number of byte to set
+ */
+static inline void _lv_memset_ff(void * dst, size_t len)
+{
+    memset(dst, 0xFF, len);
+}
+
+#else
 /**
  * Same as `memcpy` but optimized for 4 byte operation.
  * @param dst pointer to the destination buffer
@@ -168,7 +228,6 @@ LV_ATTRIBUTE_FAST_MEM static inline void * _lv_memcpy_small(void * dst, const vo
 
 /**
  * Same as `memset` but optimized for 4 byte operation.
- * `dst` should be word aligned else normal `memcpy` will be used
  * @param dst pointer to the destination buffer
  * @param v value to set [0..255]
  * @param len number of byte to set
@@ -177,7 +236,6 @@ LV_ATTRIBUTE_FAST_MEM void _lv_memset(void * dst, uint8_t v, size_t len);
 
 /**
  * Same as `memset(dst, 0x00, len)` but optimized for 4 byte operation.
- * `dst` should be word aligned else normal `memcpy` will be used
  * @param dst pointer to the destination buffer
  * @param len number of byte to set
  */
@@ -185,7 +243,6 @@ LV_ATTRIBUTE_FAST_MEM void _lv_memset_00(void * dst, size_t len);
 
 /**
  * Same as `memset(dst, 0xFF, len)` but optimized for 4 byte operation.
- * `dst` should be word aligned else normal `memcpy` will be used
  * @param dst pointer to the destination buffer
  * @param len number of byte to set
  */
@@ -193,6 +250,9 @@ LV_ATTRIBUTE_FAST_MEM void _lv_memset_ff(void * dst, size_t len);
 
 //! @endcond
 
+#endif
+
+
 /**********************
  *      MACROS
  **********************/

src/lv_misc/lv_task.c

@@ -378,6 +378,17 @@ uint8_t lv_task_get_idle(void)
     return idle_last;
 }
 
+/**
+ * Iterate through the tasks
+ * @param task NULL to start iteration or the previous return value to get the next task
+ * @return the next task or NULL if there is no more task
+ */
+lv_task_t * lv_task_get_next(lv_task_t * task)
+{
+    if(task == NULL) return _lv_ll_get_head(&LV_GC_ROOT(_lv_task_ll));
+    else return _lv_ll_get_next(&LV_GC_ROOT(_lv_task_ll), task);
+}
+
 /**********************
  *   STATIC FUNCTIONS
  **********************/

src/lv_misc/lv_task.h

@@ -165,6 +165,13 @@ void lv_task_enable(bool en);
  */
 uint8_t lv_task_get_idle(void);
 
+/**
+ * Iterate through the tasks
+ * @param task NULL to start iteration or the previous return value to get the next task
+ * @return the next task or NULL if there is no more task
+ */
+lv_task_t * lv_task_get_next(lv_task_t * task);
+
 /**********************
  *      MACROS
  **********************/

src/lv_misc/lv_txt.c

@@ -436,6 +436,8 @@ void _lv_txt_ins(char * txt_buf, uint32_t pos, const char * ins_txt)
 {
     size_t old_len = strlen(txt_buf);
     size_t ins_len = strlen(ins_txt);
+    if(ins_len == 0) return;
+
     size_t new_len = ins_len + old_len;
     pos              = _lv_txt_encoded_get_byte_id(txt_buf, pos); /*Convert to byte index instead of letter index*/
 

src/lv_themes/lv_theme.h

@@ -109,6 +109,9 @@ typedef enum {
 #if LV_USE_ROLLER
     LV_THEME_ROLLER,
 #endif
+#if LV_USE_ROTARY
+    LV_THEME_ROTARY,
+#endif
 #if LV_USE_SLIDER
     LV_THEME_SLIDER,
 #endif

src/lv_themes/lv_theme_empty.c

@@ -95,7 +95,7 @@ lv_theme_t * lv_theme_empty_init(lv_color_t color_primary, lv_color_t color_seco
 }
 
 
-void theme_apply(lv_theme_t * th, lv_obj_t * obj, lv_theme_style_t name)
+static void theme_apply(lv_theme_t * th, lv_obj_t * obj, lv_theme_style_t name)
 {
     LV_UNUSED(th);
     if(name == LV_THEME_SCR) {

src/lv_themes/lv_theme_material.c

@@ -64,8 +64,9 @@
 #define COLOR_BG_SEC_TEXT       (IS_LIGHT ? lv_color_hex(0x31404f) : lv_color_hex(0xa5a8ad))
 #define COLOR_BG_SEC_TEXT_DIS   (IS_LIGHT ? lv_color_hex(0xaaaaaa) : lv_color_hex(0xa5a8ad))
 
-#define TRANSITION_TIME         150
+#define TRANSITION_TIME         ((theme.flags & LV_THEME_MATERIAL_FLAG_NO_TRANSITION) ? 0 : 150)
 #define BORDER_WIDTH            LV_DPX(2)
+#define OUTLINE_WIDTH           ((theme.flags & LV_THEME_MATERIAL_FLAG_NO_FOCUS) ? 0 : LV_DPX(2))
 #define IS_LIGHT (theme.flags & LV_THEME_MATERIAL_FLAG_LIGHT)
 
 #define PAD_DEF (lv_disp_get_size_category(NULL) <= LV_DISP_SIZE_MEDIUM ? LV_DPX(15) : (LV_DPX(30)))
@@ -85,6 +86,7 @@ typedef struct {
 #if LV_USE_ARC
     lv_style_t arc_indic;
     lv_style_t arc_bg;
+    lv_style_t arc_knob;
 #endif
 
 #if LV_USE_BAR
@@ -210,7 +212,8 @@ static void basic_init(void)
     lv_style_set_bg_opa(&styles->bg, LV_STATE_DEFAULT, LV_OPA_COVER);
     lv_style_set_bg_color(&styles->bg, LV_STATE_DEFAULT, COLOR_BG);
     lv_style_set_border_color(&styles->bg, LV_STATE_DEFAULT, COLOR_BG_BORDER);
-    lv_style_set_border_color(&styles->bg, LV_STATE_FOCUSED, theme.color_primary);
+    if((theme.flags & LV_THEME_MATERIAL_FLAG_NO_FOCUS) == 0)lv_style_set_border_color(&styles->bg, LV_STATE_FOCUSED,
+                                                                                          theme.color_primary);
     lv_style_set_border_color(&styles->bg, LV_STATE_EDITED, theme.color_secondary);
     lv_style_set_border_width(&styles->bg, LV_STATE_DEFAULT, BORDER_WIDTH);
     lv_style_set_border_post(&styles->bg, LV_STATE_DEFAULT, true);
@@ -298,7 +301,7 @@ static void basic_init(void)
     lv_style_set_pad_top(&styles->btn, LV_STATE_DEFAULT, LV_DPX(15));
     lv_style_set_pad_bottom(&styles->btn, LV_STATE_DEFAULT, LV_DPX(15));
     lv_style_set_pad_inner(&styles->btn, LV_STATE_DEFAULT, LV_DPX(20));
-    lv_style_set_outline_width(&styles->btn, LV_STATE_DEFAULT, 3);
+    lv_style_set_outline_width(&styles->btn, LV_STATE_DEFAULT, OUTLINE_WIDTH);
     lv_style_set_outline_opa(&styles->btn, LV_STATE_DEFAULT, LV_OPA_0);
     lv_style_set_outline_opa(&styles->btn, LV_STATE_FOCUSED, LV_OPA_50);
     lv_style_set_outline_color(&styles->btn, LV_STATE_DEFAULT, theme.color_primary);
@@ -357,7 +360,7 @@ static void bar_init(void)
     lv_style_set_outline_color(&styles->bar_bg, LV_STATE_EDITED, theme.color_secondary);
     lv_style_set_outline_opa(&styles->bar_bg, LV_STATE_DEFAULT, LV_OPA_TRANSP);
     lv_style_set_outline_opa(&styles->bar_bg, LV_STATE_FOCUSED, LV_OPA_50);
-    lv_style_set_outline_width(&styles->bar_bg, LV_STATE_DEFAULT, 3);
+    lv_style_set_outline_width(&styles->bar_bg, LV_STATE_DEFAULT, OUTLINE_WIDTH);
     lv_style_set_transition_time(&styles->bar_bg, LV_STATE_DEFAULT, TRANSITION_TIME);
     lv_style_set_transition_prop_6(&styles->bar_bg, LV_STATE_DEFAULT, LV_STYLE_OUTLINE_OPA);
 
@@ -503,6 +506,14 @@ static void arc_init(void)
     lv_style_set_line_color(&styles->arc_bg, LV_STATE_DEFAULT, COLOR_BG_SEC);
     lv_style_set_line_width(&styles->arc_bg, LV_STATE_DEFAULT, LV_DPX(25));
     lv_style_set_line_rounded(&styles->arc_bg, LV_STATE_DEFAULT, true);
+
+    style_init_reset(&styles->arc_knob);
+    lv_style_set_radius(&styles->arc_knob, LV_STATE_DEFAULT,   LV_RADIUS_CIRCLE);
+    lv_style_set_pad_top(&styles->arc_knob, LV_STATE_DEFAULT,  LV_DPX(0));
+    lv_style_set_pad_bottom(&styles->arc_knob, LV_STATE_DEFAULT,  LV_DPX(0));
+    lv_style_set_pad_left(&styles->arc_knob, LV_STATE_DEFAULT,    LV_DPX(0));
+    lv_style_set_pad_right(&styles->arc_knob, LV_STATE_DEFAULT,   LV_DPX(0));
+
 #endif
 }
 
@@ -555,7 +566,7 @@ static void calendar_init(void)
     lv_style_set_radius(&styles->calendar_date_nums, LV_STATE_DEFAULT, LV_DPX(4));
     lv_style_set_text_color(&styles->calendar_date_nums, LV_STATE_CHECKED,
                             IS_LIGHT ? lv_color_hex(0x31404f) : LV_COLOR_WHITE);
-
+    lv_style_set_text_color(&styles->calendar_date_nums, LV_STATE_DISABLED, LV_COLOR_GRAY);
     lv_style_set_bg_opa(&styles->calendar_date_nums, LV_STATE_CHECKED, IS_LIGHT ? LV_OPA_20 : LV_OPA_40);
     lv_style_set_bg_opa(&styles->calendar_date_nums, LV_STATE_PRESSED, LV_OPA_20);
     lv_style_set_bg_opa(&styles->calendar_date_nums, LV_STATE_FOCUSED, LV_OPA_COVER);
@@ -608,7 +619,7 @@ static void checkbox_init(void)
     lv_style_set_outline_color(&styles->cb_bg, LV_STATE_DEFAULT, theme.color_primary);
     lv_style_set_outline_opa(&styles->cb_bg, LV_STATE_DEFAULT, LV_OPA_TRANSP);
     lv_style_set_outline_opa(&styles->cb_bg, LV_STATE_FOCUSED, LV_OPA_50);
-    lv_style_set_outline_width(&styles->cb_bg, LV_STATE_DEFAULT, LV_DPX(3));
+    lv_style_set_outline_width(&styles->cb_bg, LV_STATE_DEFAULT, OUTLINE_WIDTH);
     lv_style_set_outline_pad(&styles->cb_bg, LV_STATE_DEFAULT, LV_DPX(10));
     lv_style_set_transition_time(&styles->cb_bg, LV_STATE_DEFAULT, TRANSITION_TIME);
     lv_style_set_transition_prop_6(&styles->cb_bg, LV_STATE_DEFAULT, LV_STYLE_OUTLINE_OPA);
@@ -618,6 +629,9 @@ static void checkbox_init(void)
     lv_style_set_radius(&styles->cb_bullet, LV_STATE_DEFAULT, LV_DPX(4));
     lv_style_set_pattern_image(&styles->cb_bullet, LV_STATE_CHECKED, LV_SYMBOL_OK);
     lv_style_set_pattern_recolor(&styles->cb_bullet, LV_STATE_CHECKED, LV_COLOR_WHITE);
+    lv_style_set_pattern_opa(&styles->cb_bullet, LV_STATE_DEFAULT, LV_OPA_TRANSP);
+    lv_style_set_pattern_opa(&styles->cb_bullet, LV_STATE_CHECKED, LV_OPA_COVER);
+    lv_style_set_transition_prop_3(&styles->cb_bullet, LV_STATE_DEFAULT, LV_STYLE_PATTERN_OPA);
     lv_style_set_text_font(&styles->cb_bullet, LV_STATE_CHECKED, theme.font_small);
     lv_style_set_pad_left(&styles->cb_bullet, LV_STATE_DEFAULT, LV_DPX(3));
     lv_style_set_pad_right(&styles->cb_bullet, LV_STATE_DEFAULT, LV_DPX(3));
@@ -738,7 +752,7 @@ static void list_init(void)
     lv_style_set_border_width(&styles->list_btn, LV_STATE_DEFAULT, 1);
 
     lv_style_set_outline_color(&styles->list_btn, LV_STATE_FOCUSED, theme.color_secondary);
-    lv_style_set_outline_width(&styles->list_btn, LV_STATE_FOCUSED, BORDER_WIDTH);
+    lv_style_set_outline_width(&styles->list_btn, LV_STATE_FOCUSED, OUTLINE_WIDTH);
     lv_style_set_outline_pad(&styles->list_btn, LV_STATE_FOCUSED, -BORDER_WIDTH);
 
     lv_style_set_pad_left(&styles->list_btn, LV_STATE_DEFAULT, PAD_DEF);
@@ -1057,6 +1071,11 @@ static void theme_apply(lv_theme_t * th, lv_obj_t * obj, lv_theme_style_t name)
 
             list = lv_obj_get_style_list(obj, LV_ARC_PART_INDIC);
             _lv_style_list_add_style(list, &styles->arc_indic);
+
+            list = lv_obj_get_style_list(obj, LV_ARC_PART_KNOB);
+            _lv_style_list_add_style(list, &styles->bg);
+            _lv_style_list_add_style(list, &styles->bg_click);
+            _lv_style_list_add_style(list, &styles->arc_knob);
             break;
 #endif
 
@@ -1183,7 +1202,6 @@ static void theme_apply(lv_theme_t * th, lv_obj_t * obj, lv_theme_style_t name)
             break;
 #endif
 
-
 #if LV_USE_OBJMASK
         case LV_THEME_OBJMASK:
             list = lv_obj_get_style_list(obj, LV_OBJMASK_PART_MAIN);
@@ -1366,7 +1384,7 @@ static void theme_apply(lv_theme_t * th, lv_obj_t * obj, lv_theme_style_t name)
             break;
     }
 
-    lv_obj_refresh_style(obj, LV_STYLE_PROP_ALL);
+    lv_obj_refresh_style(obj, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
 }
 
 /**********************

src/lv_themes/lv_theme_material.h

@@ -24,6 +24,7 @@ typedef enum {
     LV_THEME_MATERIAL_FLAG_DARK =  0x01,
     LV_THEME_MATERIAL_FLAG_LIGHT = 0x02,
     LV_THEME_MATERIAL_FLAG_NO_TRANSITION  = 0x10,
+    LV_THEME_MATERIAL_FLAG_NO_FOCUS  = 0x20,
 } lv_theme_material_flag_t;
 
 /**********************

src/lv_themes/lv_theme_mono.c

@@ -1023,7 +1023,7 @@ static void theme_apply(lv_theme_t * th, lv_obj_t * obj, lv_theme_style_t name)
     }
 
 
-    lv_obj_refresh_style(obj, LV_STYLE_PROP_ALL);
+    lv_obj_refresh_style(obj, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
 
 
 }

src/lv_themes/lv_theme_template.c

@@ -855,7 +855,7 @@ void theme_apply(lv_theme_t * th, lv_obj_t * obj, lv_theme_style_t name)
             break;
     }
 
-    lv_obj_refresh_style(obj, LV_STYLE_PROP_ALL);
+    lv_obj_refresh_style(obj, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
 }
 
 /**********************

src/lv_widgets/lv_arc.c

@@ -9,6 +9,8 @@
 #include "lv_arc.h"
 #if LV_USE_ARC != 0
 
+#include "../lv_core/lv_group.h"
+#include "../lv_core/lv_indev.h"
 #include "../lv_misc/lv_debug.h"
 #include "../lv_misc/lv_math.h"
 #include "../lv_draw/lv_draw_arc.h"
@@ -29,7 +31,9 @@
 static lv_design_res_t lv_arc_design(lv_obj_t * arc, const lv_area_t * clip_area, lv_design_mode_t mode);
 static lv_res_t lv_arc_signal(lv_obj_t * arc, lv_signal_t sign, void * param);
 static lv_style_list_t * lv_arc_get_style(lv_obj_t * arc, uint8_t part);
-static void inv_arc_area(lv_obj_t * arc, uint16_t start_angle, uint16_t end_angle);
+static void inv_arc_area(lv_obj_t * arc, uint16_t start_angle, uint16_t end_angle, lv_arc_part_t part);
+static void get_center(lv_obj_t * arc, lv_point_t * center, lv_coord_t * arc_r);
+static void get_knob_area(lv_obj_t * arc, const lv_point_t * center, lv_coord_t r, lv_area_t * knob_area);
 
 /**********************
  *  STATIC VARIABLES
@@ -78,7 +82,16 @@ lv_obj_t * lv_arc_create(lv_obj_t * par, const lv_obj_t * copy)
     ext->bg_angle_end   = 45;
     ext->arc_angle_start = 135;
     ext->arc_angle_end   = 270;
+    ext->type = LV_ARC_TYPE_NORMAL;
+    ext->cur_value = -1;
+    ext->min_value = 0;
+    ext->max_value = 100;
+    ext->dragging = false;
+    ext->chg_rate = 540;
+    ext->last_tick = lv_tick_get();
+    ext->last_angle = ext->arc_angle_end;
     lv_style_list_init(&ext->style_arc);
+    lv_style_list_init(&ext->style_knob);
 
     lv_obj_set_size(arc, LV_DPI, LV_DPI);
 
@@ -88,6 +101,10 @@ lv_obj_t * lv_arc_create(lv_obj_t * par, const lv_obj_t * copy)
 
     /*Init the new arc arc*/
     if(copy == NULL) {
+        lv_obj_set_click(arc, true);
+        lv_obj_add_protect(arc, LV_PROTECT_PRESS_LOST);
+        lv_obj_set_ext_click_area(arc, LV_DPI / 10, LV_DPI / 10, LV_DPI / 10, LV_DPI / 10);
+        lv_arc_set_value(arc, ext->min_value);
         lv_theme_apply(arc, LV_THEME_ARC);
     }
     /*Copy an existing arc*/
@@ -97,11 +114,19 @@ lv_obj_t * lv_arc_create(lv_obj_t * par, const lv_obj_t * copy)
         ext->arc_angle_end   = copy_ext->arc_angle_end;
         ext->bg_angle_start  = copy_ext->bg_angle_start;
         ext->bg_angle_end    = copy_ext->bg_angle_end;
-
+        ext->type = copy_ext->type;
+        ext->cur_value = copy_ext->cur_value;
+        ext->min_value = copy_ext->min_value;
+        ext->max_value = copy_ext->max_value;
+        ext->dragging = copy_ext->dragging;
+        ext->chg_rate = copy_ext->chg_rate;
+        ext->last_tick = copy_ext->last_tick;
+        ext->last_angle = copy_ext->last_angle;
+        lv_style_list_copy(&ext->style_knob, &copy_ext->style_knob);
         lv_style_list_copy(&ext->style_arc, &copy_ext->style_arc);
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(arc, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(arc, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("arc created");
@@ -140,11 +165,13 @@ void lv_arc_set_start_angle(lv_obj_t * arc, uint16_t start)
     }
     /*Only a smaller incremental move*/
     else if(ext->arc_angle_start > ext->arc_angle_end && start > ext->arc_angle_end) {
-        inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_start, start), LV_MATH_MAX(ext->arc_angle_start, start));
+        inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_start, start), LV_MATH_MAX(ext->arc_angle_start, start),
+                     LV_ARC_PART_INDIC);
     }
     /*Only a smaller incremental move*/
     else  if(ext->arc_angle_start < ext->arc_angle_end && start < ext->arc_angle_end) {
-        inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_start, start), LV_MATH_MAX(ext->arc_angle_start, start));
+        inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_start, start), LV_MATH_MAX(ext->arc_angle_start, start),
+                     LV_ARC_PART_INDIC);
     }
     /*Crossing the start angle makes the whole arc change*/
     else {
@@ -173,11 +200,11 @@ void lv_arc_set_end_angle(lv_obj_t * arc, uint16_t end)
     }
     /*Only a smaller incremental move*/
     else if(ext->arc_angle_end > ext->arc_angle_start && end > ext->arc_angle_start) {
-        inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_end, end), LV_MATH_MAX(ext->arc_angle_end, end));
+        inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_end, end), LV_MATH_MAX(ext->arc_angle_end, end), LV_ARC_PART_INDIC);
     }
     /*Only a smaller incremental move*/
     else  if(ext->arc_angle_end < ext->arc_angle_start && end < ext->arc_angle_start) {
-        inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_end, end), LV_MATH_MAX(ext->arc_angle_end, end));
+        inv_arc_area(arc, LV_MATH_MIN(ext->arc_angle_end, end), LV_MATH_MAX(ext->arc_angle_end, end), LV_ARC_PART_INDIC);
     }
     /*Crossing the end angle makes the whole arc change*/
     else {
@@ -203,12 +230,12 @@ void lv_arc_set_angles(lv_obj_t * arc, uint16_t start, uint16_t end)
     if(start > 360) start -= 360;
     if(end > (start + 360)) end = start + 360;
 
-    inv_arc_area(arc, ext->arc_angle_start, ext->arc_angle_end);
+    inv_arc_area(arc, ext->arc_angle_start, ext->arc_angle_end, LV_ARC_PART_INDIC);
 
     ext->arc_angle_start = start;
     ext->arc_angle_end = end;
 
-    inv_arc_area(arc, ext->arc_angle_start, ext->arc_angle_end);
+    inv_arc_area(arc, ext->arc_angle_start, ext->arc_angle_end, LV_ARC_PART_INDIC);
 }
 
 /**
@@ -230,11 +257,11 @@ void lv_arc_set_bg_start_angle(lv_obj_t * arc, uint16_t start)
     }
     /*Only a smaller incremental move*/
     else if(ext->bg_angle_start > ext->bg_angle_end && start > ext->bg_angle_end) {
-        inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_start, start), LV_MATH_MAX(ext->bg_angle_start, start));
+        inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_start, start), LV_MATH_MAX(ext->bg_angle_start, start), LV_ARC_PART_BG);
     }
     /*Only a smaller incremental move*/
     else  if(ext->bg_angle_start < ext->bg_angle_end && start < ext->bg_angle_end) {
-        inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_start, start), LV_MATH_MAX(ext->bg_angle_start, start));
+        inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_start, start), LV_MATH_MAX(ext->bg_angle_start, start), LV_ARC_PART_BG);
     }
     /*Crossing the start angle makes the whole arc change*/
     else {
@@ -263,11 +290,11 @@ void lv_arc_set_bg_end_angle(lv_obj_t * arc, uint16_t end)
     }
     /*Only a smaller incremental move*/
     else if(ext->bg_angle_end > ext->bg_angle_start && end > ext->bg_angle_start) {
-        inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_end, end), LV_MATH_MAX(ext->bg_angle_end, end));
+        inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_end, end), LV_MATH_MAX(ext->bg_angle_end, end), LV_ARC_PART_BG);
     }
     /*Only a smaller incremental move*/
     else  if(ext->bg_angle_end < ext->bg_angle_start && end < ext->bg_angle_start) {
-        inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_end, end), LV_MATH_MAX(ext->bg_angle_end, end));
+        inv_arc_area(arc, LV_MATH_MIN(ext->bg_angle_end, end), LV_MATH_MAX(ext->bg_angle_end, end), LV_ARC_PART_BG);
     }
     /*Crossing the end angle makes the whole arc change*/
     else {
@@ -292,12 +319,12 @@ void lv_arc_set_bg_angles(lv_obj_t * arc, uint16_t start, uint16_t end)
     if(start > 360) start -= 360;
     if(end > (start + 360)) end = start + 360;
 
-    inv_arc_area(arc, ext->bg_angle_start, ext->bg_angle_end);
+    inv_arc_area(arc, ext->bg_angle_start, ext->bg_angle_end, LV_ARC_PART_BG);
 
     ext->bg_angle_start = start;
     ext->bg_angle_end = end;
 
-    inv_arc_area(arc, ext->bg_angle_start, ext->bg_angle_end);
+    inv_arc_area(arc, ext->bg_angle_start, ext->bg_angle_end, LV_ARC_PART_BG);
 }
 
 /**
@@ -316,6 +343,133 @@ void lv_arc_set_rotation(lv_obj_t * arc, uint16_t rotation_angle)
     lv_obj_invalidate(arc);
 }
 
+
+/**
+ * Set the type of arc.
+ * @param arc pointer to arc object
+ * @param type arc type
+ */
+void lv_arc_set_type(lv_obj_t * arc, lv_arc_type_t type)
+{
+    LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
+
+    lv_arc_ext_t * ext = (lv_arc_ext_t *)lv_obj_get_ext_attr(arc);
+    int16_t val = ext->cur_value;
+
+    ext->type = type;
+    ext->cur_value = -1; /** Force set_value handling*/
+
+    int16_t bg_midpoint, bg_end = ext->bg_angle_end;
+    if(ext->bg_angle_end < ext->bg_angle_start) bg_end = ext->bg_angle_end + 360;
+
+    switch(ext->type) {
+        case LV_ARC_TYPE_SYMMETRIC:
+            bg_midpoint = (ext->bg_angle_start + bg_end) / 2;
+            lv_arc_set_start_angle(arc, bg_midpoint);
+            lv_arc_set_end_angle(arc, bg_midpoint);
+            break;
+        case LV_ARC_TYPE_REVERSE:
+            lv_arc_set_end_angle(arc, ext->bg_angle_end);
+            break;
+        default: /** LV_ARC_TYPE_NORMAL*/
+            lv_arc_set_start_angle(arc, ext->bg_angle_start);
+    }
+
+    lv_arc_set_value(arc, val);
+}
+
+/**
+ * Set a new value on the arc
+ * @param arc pointer to a arc object
+ * @param value new value
+ */
+void lv_arc_set_value(lv_obj_t * arc, int16_t value)
+{
+    LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
+
+    lv_arc_ext_t * ext = (lv_arc_ext_t *)lv_obj_get_ext_attr(arc);
+    if(ext->cur_value == value) return;
+
+    int16_t new_value;
+    new_value = value > ext->max_value ? ext->max_value : value;
+    new_value = new_value < ext->min_value ? ext->min_value : new_value;
+
+    if(ext->cur_value == new_value) return;
+    ext->cur_value = new_value;
+
+    int16_t bg_midpoint, range_midpoint, bg_end = ext->bg_angle_end;
+    if(ext->bg_angle_end < ext->bg_angle_start) bg_end = ext->bg_angle_end + 360;
+
+    int16_t angle;
+    switch(ext->type) {
+        case LV_ARC_TYPE_SYMMETRIC:
+            bg_midpoint = (ext->bg_angle_start + bg_end) / 2;
+            range_midpoint = (int32_t)(ext->min_value + ext->max_value) / 2;
+
+            if(ext->cur_value < range_midpoint) {
+                angle = _lv_map(ext->cur_value, ext->min_value, range_midpoint, ext->bg_angle_start, bg_midpoint);
+                lv_arc_set_start_angle(arc, angle);
+                lv_arc_set_end_angle(arc, bg_midpoint);
+            }
+            else {
+                angle = _lv_map(ext->cur_value, range_midpoint, ext->max_value, bg_midpoint, bg_end);
+                lv_arc_set_start_angle(arc, bg_midpoint);
+                lv_arc_set_end_angle(arc, angle);
+            }
+            break;
+        case LV_ARC_TYPE_REVERSE:
+            angle = _lv_map(ext->cur_value, ext->min_value, ext->max_value, ext->bg_angle_start, bg_end);
+            lv_arc_set_start_angle(arc, angle);
+            break;
+        default: /** LV_ARC_TYPE_NORMAL*/
+            angle = _lv_map(ext->cur_value, ext->min_value, ext->max_value, ext->bg_angle_start, bg_end);
+            lv_arc_set_start_angle(arc, ext->bg_angle_start);
+            lv_arc_set_end_angle(arc, angle);
+    }
+    ext->last_angle = angle; /*Cache angle for slew rate limiting*/
+}
+
+/**
+ * Set minimum and the maximum values of a arc
+ * @param arc pointer to the arc object
+ * @param min minimum value
+ * @param max maximum value
+ */
+void lv_arc_set_range(lv_obj_t * arc, int16_t min, int16_t max)
+{
+    LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
+
+    lv_arc_ext_t * ext = (lv_arc_ext_t *)lv_obj_get_ext_attr(arc);
+    if(ext->min_value == min && ext->max_value == max) return;
+
+    ext->min_value = min;
+    ext->max_value = max;
+
+    if(ext->cur_value < min) {
+        ext->cur_value = min;
+    }
+    if(ext->cur_value > max) {
+        ext->cur_value = max;
+    }
+
+    lv_arc_set_value(arc, ext->cur_value);
+}
+
+/**
+ * Set the threshold of arc knob increments
+ * position.
+ * @param arc pointer to a arc object
+ * @param threshold increment threshold
+ */
+void lv_arc_set_chg_rate(lv_obj_t * arc, uint16_t rate)
+{
+    LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
+
+    lv_arc_ext_t * ext = (lv_arc_ext_t *)lv_obj_get_ext_attr(arc);
+    ext->chg_rate = rate;
+}
+
+
 /*=====================
  * Getter functions
  *====================*/
@@ -376,6 +530,72 @@ uint16_t lv_arc_get_bg_angle_end(lv_obj_t * arc)
     return ext->bg_angle_end;
 }
 
+
+/**
+ * Get the value of a arc
+ * @param arc pointer to a arc object
+ * @return the value of the arc
+ */
+int16_t lv_arc_get_value(const lv_obj_t * arc)
+{
+    LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
+
+    lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
+    return ext->cur_value;
+}
+
+/**
+ * Get the minimum value of a arc
+ * @param arc pointer to a arc object
+ * @return the minimum value of the arc
+ */
+int16_t lv_arc_get_min_value(const lv_obj_t * arc)
+{
+    LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
+
+    lv_arc_ext_t * ext = (lv_arc_ext_t *)lv_obj_get_ext_attr(arc);
+    return ext->min_value;
+}
+
+/**
+ * Get the maximum value of a arc
+ * @param arc pointer to a arc object
+ * @return the maximum value of the arc
+ */
+int16_t lv_arc_get_max_value(const lv_obj_t * arc)
+{
+    LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
+
+    lv_arc_ext_t * ext = (lv_arc_ext_t *)lv_obj_get_ext_attr(arc);
+    return ext->max_value;
+}
+
+/**
+ * Give the arc is being dragged or not
+ * @param arc pointer to a arc object
+ * @return true: drag in progress false: not dragged
+ */
+bool lv_arc_is_dragged(const lv_obj_t * arc)
+{
+    LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
+
+    lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
+    return ext->dragging;
+}
+
+/**
+ * Get whether the arc is type or not.
+ * @param arc pointer to a arc object
+ * @return arc type
+ */
+lv_arc_type_t lv_arc_get_type(const lv_obj_t * arc)
+{
+    LV_ASSERT_OBJ(arc, LV_OBJX_NAME);
+
+    lv_arc_ext_t * ext = (lv_arc_ext_t *)lv_obj_get_ext_attr(arc);
+    return ext->type;
+}
+
 /*=====================
  * Other functions
  *====================*/
@@ -414,21 +634,18 @@ static lv_design_res_t lv_arc_design(lv_obj_t * arc, const lv_area_t * clip_area
 
         lv_draw_rect(&arc->coords, clip_area, &bg_dsc);
 
-        lv_coord_t left_bg = lv_obj_get_style_pad_left(arc, LV_ARC_PART_BG);
-        lv_coord_t right_bg = lv_obj_get_style_pad_right(arc, LV_ARC_PART_BG);
-        lv_coord_t top_bg = lv_obj_get_style_pad_top(arc, LV_ARC_PART_BG);
-        lv_coord_t bottom_bg = lv_obj_get_style_pad_bottom(arc, LV_ARC_PART_BG);
-        lv_coord_t r       = (LV_MATH_MIN(lv_obj_get_width(arc) - left_bg - right_bg,
-                                          lv_obj_get_height(arc) - top_bg - bottom_bg)) / 2;
-        lv_draw_line_dsc_t arc_dsc;
-        lv_coord_t x       = arc->coords.x1 + r + left_bg;
-        lv_coord_t y       = arc->coords.y1 + r + top_bg;
+        lv_point_t center;
+        lv_coord_t arc_r;
+        get_center(arc, &center, &arc_r);
 
-        if(r > 0) {
+        /*Draw the background arc*/
+        lv_draw_line_dsc_t arc_dsc;
+        if(arc_r > 0) {
             lv_draw_line_dsc_init(&arc_dsc);
             lv_obj_init_draw_line_dsc(arc, LV_ARC_PART_BG, &arc_dsc);
 
-            lv_draw_arc(x, y, r, ext->bg_angle_start + ext->rotation_angle, ext->bg_angle_end + ext->rotation_angle, clip_area,
+            lv_draw_arc(center.x, center.y, arc_r, ext->bg_angle_start + ext->rotation_angle,
+                        ext->bg_angle_end + ext->rotation_angle, clip_area,
                         &arc_dsc);
         }
 
@@ -438,15 +655,26 @@ static lv_design_res_t lv_arc_design(lv_obj_t * arc, const lv_area_t * clip_area
         lv_coord_t right_indic = lv_obj_get_style_pad_right(arc, LV_ARC_PART_INDIC);
         lv_coord_t top_indic = lv_obj_get_style_pad_top(arc, LV_ARC_PART_INDIC);
         lv_coord_t bottom_indic = lv_obj_get_style_pad_bottom(arc, LV_ARC_PART_INDIC);
-        r -= LV_MATH_MAX4(left_indic, right_indic, top_indic, bottom_indic);
+        lv_coord_t indic_r = arc_r - LV_MATH_MAX4(left_indic, right_indic, top_indic, bottom_indic);
 
-        if(r > 0) {
+        if(indic_r > 0) {
             lv_draw_line_dsc_init(&arc_dsc);
             lv_obj_init_draw_line_dsc(arc, LV_ARC_PART_INDIC, &arc_dsc);
 
-            lv_draw_arc(x, y, r, ext->arc_angle_start + ext->rotation_angle, ext->arc_angle_end + ext->rotation_angle, clip_area,
+            lv_draw_arc(center.x, center.y, indic_r, ext->arc_angle_start + ext->rotation_angle,
+                        ext->arc_angle_end + ext->rotation_angle, clip_area,
                         &arc_dsc);
         }
+
+        lv_area_t knob_area;
+        get_knob_area(arc, &center, arc_r, &knob_area);
+
+        lv_draw_rect_dsc_t knob_rect_dsc;
+        lv_draw_rect_dsc_init(&knob_rect_dsc);
+        lv_obj_init_draw_rect_dsc(arc, LV_ARC_PART_KNOB, &knob_rect_dsc);
+
+        lv_draw_rect(&knob_area, clip_area, &knob_rect_dsc);
+
     }
     /*Post draw when the children are drawn*/
     else if(mode == LV_DESIGN_DRAW_POST) {
@@ -478,7 +706,121 @@ static lv_res_t lv_arc_signal(lv_obj_t * arc, lv_signal_t sign, void * param)
 
     if(sign == LV_SIGNAL_GET_TYPE) return lv_obj_handle_get_type_signal(param, LV_OBJX_NAME);
 
-    if(sign == LV_SIGNAL_CLEANUP) {
+    lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
+
+    if(sign == LV_SIGNAL_PRESSING) {
+        lv_indev_t * indev = lv_indev_get_act();
+        if(indev == NULL) return res;
+
+        /*Handle only pointers here*/
+        lv_indev_type_t indev_type = lv_indev_get_type(indev);
+        if(indev_type != LV_INDEV_TYPE_POINTER) return res;
+
+        lv_point_t p;
+        lv_indev_get_point(indev, &p);
+
+        /*Make point relative to the arc's center*/
+        lv_point_t center;
+        lv_coord_t r;
+        get_center(arc, &center, &r);
+
+        p.x -=  center.x;
+        p.y -=  center.y;
+
+        /*Enter dragging mode if pressed out of the knob*/
+        if(ext->dragging == false) {
+            lv_coord_t indic_width = lv_obj_get_style_line_width(arc, LV_ARC_PART_INDIC);
+            r -=  indic_width;
+            r -= r / 2; /*Add some more sensitive area*/
+            if(p.x * p.x + p.y * p.y > r * r) {
+                ext->dragging = true;
+                ext->last_tick = lv_tick_get(); /*Capture timestamp at dragging start*/
+            }
+        }
+
+        /*It must be in "dragging" mode to turn the arc*/
+        if(ext->dragging == false) return res;
+
+        /*Calculate the angle of the pressed point*/
+        int16_t angle;
+        int16_t bg_end = ext->bg_angle_end;
+        if(ext->bg_angle_end < ext->bg_angle_start) {
+            bg_end = ext->bg_angle_end + 360;
+        }
+
+        angle = 360 - _lv_atan2(p.x, p.y) + 90; /*Some transformation is required*/
+        angle -= ext->rotation_angle;
+        if(angle < ext->bg_angle_start) angle = ext->bg_angle_start;
+        if(angle > bg_end) angle = bg_end;
+
+        /*Calculate the slew rate limited angle based on change rate (degrees/sec)*/
+        int16_t delta_angle = angle - ext->last_angle;
+        uint32_t delta_tick = lv_tick_elaps(ext->last_tick);
+        int16_t delta_angle_max = (ext->chg_rate * delta_tick) / 1000;
+
+        if(delta_angle > delta_angle_max) {
+            delta_angle = delta_angle_max;
+        }
+        else if(delta_angle < -delta_angle_max) {
+            delta_angle = -delta_angle_max;
+        }
+
+        angle = ext->last_angle + delta_angle; /*Apply the limited angle change*/
+
+        /*Rounding for symmetry*/
+        int32_t round = ((bg_end - ext->bg_angle_start) * 8) / (ext->max_value - ext->min_value);
+        round = (round + 4) >> 4;
+        angle += round;
+
+        /*Set the new value*/
+        int16_t old_value = ext->cur_value;
+        int16_t new_value = _lv_map(angle, ext->bg_angle_start, bg_end, ext->min_value, ext->max_value);
+        if(new_value != lv_arc_get_value(arc)) {
+            ext->last_tick = lv_tick_get(); /*Cache timestamp for the next iteration*/
+            lv_arc_set_value(arc, new_value); /*set_value caches the last_angle for the next iteration*/
+            if(new_value != old_value) {
+                res = lv_event_send(arc, LV_EVENT_VALUE_CHANGED, NULL);
+                if(res != LV_RES_OK) return res;
+            }
+        }
+
+        /*Don1't let the elapsed time to big while sitting on an end point*/
+        if(new_value == ext->min_value || new_value == ext->max_value) {
+            ext->last_tick = lv_tick_get(); /*Cache timestamp for the next iteration*/
+        }
+    }
+    else if(sign == LV_SIGNAL_RELEASED || sign == LV_SIGNAL_PRESS_LOST) {
+        ext->dragging = false;
+
+#if LV_USE_GROUP
+        /*Leave edit mode if released. (No need to wait for LONG_PRESS) */
+        lv_group_t * g             = lv_obj_get_group(arc);
+        bool editing               = lv_group_get_editing(g);
+        lv_indev_type_t indev_type = lv_indev_get_type(lv_indev_get_act());
+        if(indev_type == LV_INDEV_TYPE_ENCODER) {
+            if(editing) lv_group_set_editing(g, false);
+        }
+#endif
+
+    }
+    else if(sign == LV_SIGNAL_CONTROL) {
+        char c = *((char *)param);
+
+        int16_t old_value = ext->cur_value;
+        if(c == LV_KEY_RIGHT || c == LV_KEY_UP) {
+            lv_arc_set_value(arc, lv_arc_get_value(arc) + 1);
+        }
+        else if(c == LV_KEY_LEFT || c == LV_KEY_DOWN) {
+            lv_arc_set_value(arc, lv_arc_get_value(arc) - 1);
+        }
+
+        if(old_value != ext->cur_value) {
+            res = lv_event_send(arc, LV_EVENT_VALUE_CHANGED, NULL);
+            if(res != LV_RES_OK) return res;
+        }
+    }
+    else if(sign == LV_SIGNAL_CLEANUP) {
+        lv_obj_clean_style_list(arc, LV_ARC_PART_KNOB);
         lv_obj_clean_style_list(arc, LV_ARC_PART_INDIC);
     }
 
@@ -506,6 +848,9 @@ static lv_style_list_t * lv_arc_get_style(lv_obj_t * arc, uint8_t part)
         case LV_ARC_PART_INDIC:
             style_dsc_p = &ext->style_arc;
             break;
+        case LV_ARC_PART_KNOB:
+            style_dsc_p = &ext->style_knob;
+            break;
         default:
             style_dsc_p = NULL;
     }
@@ -513,8 +858,11 @@ static lv_style_list_t * lv_arc_get_style(lv_obj_t * arc, uint8_t part)
     return style_dsc_p;
 }
 
-static void inv_arc_area(lv_obj_t * arc, uint16_t start_angle, uint16_t end_angle)
+static void inv_arc_area(lv_obj_t * arc, uint16_t start_angle, uint16_t end_angle, lv_arc_part_t part)
 {
+    /*Skip this complicated invalidation if the arc is not visible*/
+    if(lv_obj_is_visible(arc) == false) return;
+
     lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
 
     start_angle += ext->rotation_angle;
@@ -533,10 +881,26 @@ static void inv_arc_area(lv_obj_t * arc, uint16_t start_angle, uint16_t end_angl
     lv_coord_t rout       = (LV_MATH_MIN(lv_obj_get_width(arc) - left - right, lv_obj_get_height(arc) - top - bottom)) / 2;
     lv_coord_t x       = arc->coords.x1 + rout + left;
     lv_coord_t y       = arc->coords.y1 + rout + top;
-    lv_style_int_t w = lv_obj_get_style_line_width(arc, LV_ARC_PART_INDIC);
-    lv_style_int_t rounded = lv_obj_get_style_line_rounded(arc, LV_ARC_PART_INDIC);
+    lv_style_int_t w = lv_obj_get_style_line_width(arc, part);
+    lv_style_int_t rounded = lv_obj_get_style_line_rounded(arc, part);
     lv_coord_t rin       = rout - w;
-    lv_coord_t extra_area = rounded ? w / 2 + 2 : 0;
+    lv_coord_t extra_area = 0;
+
+    extra_area = rounded ? w / 2 + 2 : 0;
+
+    if(part == LV_ARC_PART_INDIC && lv_style_list_get_style(&ext->style_knob, 0) != NULL) {
+        lv_coord_t knob_extra_size = lv_obj_get_draw_rect_ext_pad_size(arc, LV_ARC_PART_KNOB);
+
+        lv_coord_t knob_left = lv_obj_get_style_pad_left(arc, LV_ARC_PART_KNOB);
+        lv_coord_t knob_right = lv_obj_get_style_pad_right(arc, LV_ARC_PART_KNOB);
+        lv_coord_t knob_top = lv_obj_get_style_pad_top(arc, LV_ARC_PART_KNOB);
+        lv_coord_t knob_bottom = lv_obj_get_style_pad_bottom(arc, LV_ARC_PART_KNOB);
+
+        knob_extra_size += LV_MATH_MAX4(knob_left, knob_right, knob_top, knob_bottom);
+
+        extra_area = LV_MATH_MAX(extra_area, w / 2 + 2 + knob_extra_size);
+
+    }
 
     lv_area_t inv_area;
 
@@ -617,4 +981,58 @@ static void inv_arc_area(lv_obj_t * arc, uint16_t start_angle, uint16_t end_angl
         lv_obj_invalidate(arc);
     }
 }
+
+static void get_center(lv_obj_t * arc, lv_point_t * center, lv_coord_t * arc_r)
+{
+    lv_coord_t left_bg = lv_obj_get_style_pad_left(arc, LV_ARC_PART_BG);
+    lv_coord_t right_bg = lv_obj_get_style_pad_right(arc, LV_ARC_PART_BG);
+    lv_coord_t top_bg = lv_obj_get_style_pad_top(arc, LV_ARC_PART_BG);
+    lv_coord_t bottom_bg = lv_obj_get_style_pad_bottom(arc, LV_ARC_PART_BG);
+
+    lv_coord_t r = (LV_MATH_MIN(lv_obj_get_width(arc) - left_bg - right_bg,
+                                lv_obj_get_height(arc) - top_bg - bottom_bg)) / 2;
+
+    *arc_r = r;
+    center->x = arc->coords.x1 + r + left_bg;
+    center->y = arc->coords.y1 + r + top_bg;
+
+
+    lv_coord_t indic_width = lv_obj_get_style_line_width(arc, LV_ARC_PART_INDIC);
+    r -= indic_width;
+}
+
+static void get_knob_area(lv_obj_t * arc, const lv_point_t * center, lv_coord_t r, lv_area_t * knob_area)
+{
+    lv_arc_ext_t * ext = lv_obj_get_ext_attr(arc);
+
+    lv_coord_t indic_width = lv_obj_get_style_line_width(arc, LV_ARC_PART_INDIC);
+    lv_coord_t indic_width_half = indic_width / 2;
+    r -= indic_width_half;
+
+    uint16_t angle = ext->rotation_angle;
+    if(ext->type == LV_ARC_TYPE_NORMAL) {
+        angle += ext->arc_angle_end;
+    }
+    else if(ext->type == LV_ARC_TYPE_REVERSE) {
+        angle += ext->arc_angle_start;
+    }
+    else if(ext->type == LV_ARC_TYPE_SYMMETRIC) {
+        int32_t range_midpoint = (int32_t)(ext->min_value + ext->max_value) / 2;
+        if(ext->cur_value < range_midpoint) angle += ext->arc_angle_start;
+        else angle += ext->arc_angle_end;
+    }
+    lv_coord_t knob_x = (r * _lv_trigo_sin(angle + 90)) >> LV_TRIGO_SHIFT;
+    lv_coord_t knob_y = (r * _lv_trigo_sin(angle)) >> LV_TRIGO_SHIFT;
+
+    lv_coord_t left_knob = lv_obj_get_style_pad_left(arc, LV_ARC_PART_KNOB);
+    lv_coord_t right_knob = lv_obj_get_style_pad_right(arc, LV_ARC_PART_KNOB);
+    lv_coord_t top_knob = lv_obj_get_style_pad_top(arc, LV_ARC_PART_KNOB);
+    lv_coord_t bottom_knob = lv_obj_get_style_pad_bottom(arc, LV_ARC_PART_KNOB);
+
+    knob_area->x1 = center->x + knob_x - left_knob - indic_width_half;
+    knob_area->x2 = center->x + knob_x + right_knob + indic_width_half;
+    knob_area->y1 = center->y + knob_y - top_knob - indic_width_half;
+    knob_area->y2 = center->y + knob_y + bottom_knob + indic_width_half;
+}
+
 #endif

src/lv_widgets/lv_arc.h

@@ -26,6 +26,14 @@ extern "C" {
 /**********************
  *      TYPEDEFS
  **********************/
+
+enum {
+    LV_ARC_TYPE_NORMAL,
+    LV_ARC_TYPE_SYMMETRIC,
+    LV_ARC_TYPE_REVERSE
+};
+typedef uint8_t lv_arc_type_t;
+
 /*Data of arc*/
 typedef struct {
     /*New data for this type */
@@ -35,14 +43,24 @@ typedef struct {
     uint16_t bg_angle_start;
     uint16_t bg_angle_end;
     lv_style_list_t style_arc;
+    lv_style_list_t style_knob; /* Style of the knob */
+
+    int16_t cur_value; /*Current value of the arc*/
+    int16_t min_value; /*Minimum value of the arc*/
+    int16_t max_value; /*Maximum value of the arc*/
+    uint16_t dragging    : 1;
+    uint16_t type        : 2;
+    uint16_t chg_rate; /*Drag angle rate of change of the arc (degrees/sec)*/
+    uint32_t last_tick; /*Last dragging event timestamp of the arc*/
+    int16_t last_angle; /*Last dragging angle of the arc*/
 } lv_arc_ext_t;
 
 /*Parts of the arc*/
 enum {
     LV_ARC_PART_BG = LV_OBJ_PART_MAIN,
     LV_ARC_PART_INDIC,
+    LV_ARC_PART_KNOB,
     _LV_ARC_PART_VIRTUAL_LAST,
-
     _LV_ARC_PART_REAL_LAST = _LV_OBJ_PART_REAL_LAST,
 };
 typedef uint8_t lv_arc_part_t;
@@ -118,6 +136,37 @@ void lv_arc_set_bg_angles(lv_obj_t * arc, uint16_t start, uint16_t end);
  */
 void lv_arc_set_rotation(lv_obj_t * arc, uint16_t rotation_angle);
 
+
+/**
+ * Set the type of arc.
+ * @param arc pointer to arc object
+ * @param type arc type
+ */
+void lv_arc_set_type(lv_obj_t * arc, lv_arc_type_t type);
+
+/**
+ * Set a new value on the arc
+ * @param arc pointer to a arc object
+ * @param value new value
+ */
+void lv_arc_set_value(lv_obj_t * arc, int16_t value);
+
+/**
+ * Set minimum and the maximum values of a arc
+ * @param arc pointer to the arc object
+ * @param min minimum value
+ * @param max maximum value
+ */
+void lv_arc_set_range(lv_obj_t * arc, int16_t min, int16_t max);
+
+/**
+ * Set the threshold of arc knob increments
+ * position.
+ * @param arc pointer to a arc object
+ * @param threshold increment threshold
+ */
+void lv_arc_set_chg_rate(lv_obj_t * arc, uint16_t threshold);
+
 /*=====================
  * Getter functions
  *====================*/
@@ -150,6 +199,41 @@ uint16_t lv_arc_get_bg_angle_start(lv_obj_t * arc);
  */
 uint16_t lv_arc_get_bg_angle_end(lv_obj_t * arc);
 
+/**
+ * Get whether the arc is type or not.
+ * @param arc pointer to a arc object
+ * @return arc type
+ */
+lv_arc_type_t lv_arc_get_type(const lv_obj_t * arc);
+
+/**
+ * Get the value of the of a arc
+ * @param arc pointer to a arc object
+ * @return the value of the of the arc
+ */
+int16_t lv_arc_get_value(const lv_obj_t * arc);
+
+/**
+ * Get the minimum value of a arc
+ * @param arc pointer to a arc object
+ * @return the minimum value of the arc
+ */
+int16_t lv_arc_get_min_value(const lv_obj_t * arc);
+
+/**
+ * Get the maximum value of a arc
+ * @param arc pointer to a arc object
+ * @return the maximum value of the arc
+ */
+int16_t lv_arc_get_max_value(const lv_obj_t * arc);
+
+/**
+ * Give the arc is being dragged or not
+ * @param arc pointer to a arc object
+ * @return true: drag in progress false: not dragged
+ */
+bool lv_arc_is_dragged(const lv_obj_t * arc);
+
 /*=====================
  * Other functions
  *====================*/

src/lv_widgets/lv_bar.c

@@ -130,7 +130,7 @@ lv_obj_t * lv_bar_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_style_list_copy(&ext->style_indic, &ext_copy->style_indic);
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(bar, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(bar, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
 
         lv_bar_set_value(bar, ext->cur_value, LV_ANIM_OFF);
     }
@@ -395,7 +395,9 @@ static lv_design_res_t lv_bar_design(lv_obj_t * bar, const lv_area_t * clip_area
             lv_draw_rect_dsc_init(&draw_dsc);
             draw_dsc.bg_opa = LV_OPA_TRANSP;
             draw_dsc.pattern_opa = LV_OPA_TRANSP;
+            draw_dsc.outline_opa = LV_OPA_TRANSP;
             draw_dsc.shadow_opa = LV_OPA_TRANSP;
+            draw_dsc.value_opa = LV_OPA_TRANSP;
             lv_obj_init_draw_rect_dsc(bar, LV_OBJ_PART_MAIN, &draw_dsc);
 
             lv_draw_rect(&bar->coords, clip_area, &draw_dsc);
@@ -414,6 +416,8 @@ static void draw_bg(lv_obj_t * bar, const lv_area_t * clip_area)
         draw_dsc.border_opa = LV_OPA_TRANSP;
     }
 
+    /*value will be drawn later*/
+    draw_dsc.value_opa = LV_OPA_TRANSP;
     lv_obj_init_draw_rect_dsc(bar, LV_BAR_PART_BG, &draw_dsc);
     lv_draw_rect(&bar->coords, clip_area, &draw_dsc);
 

src/lv_widgets/lv_btn.c

@@ -100,7 +100,7 @@ lv_obj_t * lv_btn_create(lv_obj_t * par, const lv_obj_t * copy)
         ext->checkable             = copy_ext->checkable;
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(btn, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(btn, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("button created");

src/lv_widgets/lv_btnmatrix.c

@@ -20,6 +20,7 @@
  *      DEFINES
  *********************/
 #define LV_OBJX_NAME "lv_btnmatrix"
+#define BTN_EXTRA_CLICK_AREA_MAX (LV_DPI / 4)
 
 /**********************
  *      TYPEDEFS
@@ -658,8 +659,8 @@ static lv_design_res_t lv_btnmatrix_design(lv_obj_t * btnm, const lv_area_t * cl
         lv_draw_rect_dsc_t draw_rect_tmp_dsc;
         lv_draw_label_dsc_t draw_label_tmp_dsc;
 
-        /*The state changes without re-caching the styles, disable the use of cache*/
         lv_state_t state_ori = btnm->state;
+        _lv_obj_disable_style_caching(btnm, true);
         btnm->state = LV_STATE_DEFAULT;
         lv_draw_rect_dsc_init(&draw_rect_rel_dsc);
         lv_draw_label_dsc_init(&draw_label_rel_dsc);
@@ -667,6 +668,7 @@ static lv_design_res_t lv_btnmatrix_design(lv_obj_t * btnm, const lv_area_t * cl
         lv_obj_init_draw_label_dsc(btnm, LV_BTNMATRIX_PART_BTN, &draw_label_rel_dsc);
         draw_label_rel_dsc.flag = txt_flag;
         btnm->state = state_ori;
+        _lv_obj_disable_style_caching(btnm, false);
 
         bool chk_inited = false;
         bool disabled_inited = false;
@@ -695,50 +697,55 @@ static lv_design_res_t lv_btnmatrix_design(lv_obj_t * btnm, const lv_area_t * cl
             /*Choose the style*/
             lv_draw_rect_dsc_t * draw_rect_dsc_act;
             lv_draw_label_dsc_t * draw_label_dsc_act;
-            bool tgl_state = button_get_tgl_state(ext->ctrl_bits[btn_i]);
+            lv_state_t btn_state = LV_STATE_DEFAULT;
+            if(button_get_tgl_state(ext->ctrl_bits[btn_i])) btn_state |= LV_STATE_CHECKED;
+            if(button_is_inactive(ext->ctrl_bits[btn_i])) btn_state |= LV_STATE_DISABLED;
+            if(btn_i == ext->btn_id_pr) btn_state |= LV_STATE_PRESSED;
+            if(btn_i == ext->btn_id_focused) {
+                btn_state |= LV_STATE_FOCUSED;
+                if(state_ori & LV_STATE_EDITED) btn_state |= LV_STATE_EDITED;
+            }
 
-            if(tgl_state) {
+            if(btn_state == LV_STATE_DEFAULT) {
+                draw_rect_dsc_act = &draw_rect_rel_dsc;
+                draw_label_dsc_act = &draw_label_rel_dsc;
+            }
+            else if(btn_state == LV_STATE_CHECKED) {
                 if(!chk_inited) {
                     btnm->state = LV_STATE_CHECKED;
+                    _lv_obj_disable_style_caching(btnm, true);
                     lv_draw_rect_dsc_init(&draw_rect_chk_dsc);
                     lv_draw_label_dsc_init(&draw_label_chk_dsc);
                     lv_obj_init_draw_rect_dsc(btnm, LV_BTNMATRIX_PART_BTN, &draw_rect_chk_dsc);
                     lv_obj_init_draw_label_dsc(btnm, LV_BTNMATRIX_PART_BTN, &draw_label_chk_dsc);
                     draw_label_chk_dsc.flag = txt_flag;
                     btnm->state = state_ori;
+                    _lv_obj_disable_style_caching(btnm, false);
                     chk_inited = true;
                 }
+                draw_rect_dsc_act = &draw_rect_chk_dsc;
+                draw_label_dsc_act = &draw_label_chk_dsc;
             }
-
-            if(button_is_inactive(ext->ctrl_bits[btn_i])) {
+            else if(btn_state == LV_STATE_DISABLED) {
                 if(!disabled_inited) {
                     btnm->state = LV_STATE_DISABLED;
+                    _lv_obj_disable_style_caching(btnm, true);
                     lv_draw_rect_dsc_init(&draw_rect_ina_dsc);
                     lv_draw_label_dsc_init(&draw_label_ina_dsc);
                     lv_obj_init_draw_rect_dsc(btnm, LV_BTNMATRIX_PART_BTN, &draw_rect_ina_dsc);
                     lv_obj_init_draw_label_dsc(btnm, LV_BTNMATRIX_PART_BTN, &draw_label_ina_dsc);
                     draw_label_ina_dsc.flag = txt_flag;
                     btnm->state = state_ori;
+                    _lv_obj_disable_style_caching(btnm, false);
                     disabled_inited = true;
                 }
                 draw_rect_dsc_act = &draw_rect_ina_dsc;
                 draw_label_dsc_act = &draw_label_ina_dsc;
             }
-            /*Simple released or checked buttons button*/
-            else if(btn_i != ext->btn_id_pr && btn_i != ext->btn_id_focused) {
-                draw_rect_dsc_act = tgl_state ? &draw_rect_chk_dsc : &draw_rect_rel_dsc;
-                draw_label_dsc_act = tgl_state ? &draw_label_chk_dsc : &draw_label_rel_dsc;
-            }
-            /*Focused and/or pressed + checked or released button*/
+            /*In other cases get the styles directly without caching them*/
             else {
-                btnm->state = LV_STATE_DEFAULT;
-                if(tgl_state) btnm->state = LV_STATE_CHECKED;
-                if(ext->btn_id_pr == btn_i) btnm->state |= LV_STATE_PRESSED;
-                if(ext->btn_id_focused == btn_i) {
-                    btnm->state |= LV_STATE_FOCUSED;
-                    if(state_ori & LV_STATE_EDITED) btnm->state |= LV_STATE_EDITED;
-                }
-
+                btnm->state = btn_state;
+                _lv_obj_disable_style_caching(btnm, true);
                 lv_draw_rect_dsc_init(&draw_rect_tmp_dsc);
                 lv_draw_label_dsc_init(&draw_label_tmp_dsc);
                 lv_obj_init_draw_rect_dsc(btnm, LV_BTNMATRIX_PART_BTN, &draw_rect_tmp_dsc);
@@ -746,8 +753,8 @@ static lv_design_res_t lv_btnmatrix_design(lv_obj_t * btnm, const lv_area_t * cl
                 draw_label_tmp_dsc.flag = txt_flag;
                 draw_rect_dsc_act = &draw_rect_tmp_dsc;
                 draw_label_dsc_act = &draw_label_tmp_dsc;
-
                 btnm->state = state_ori;
+                _lv_obj_disable_style_caching(btnm, false);
             }
 
             lv_style_int_t border_part_ori = draw_rect_dsc_act->border_side;
@@ -898,11 +905,11 @@ static lv_res_t lv_btnmatrix_signal(lv_obj_t * btnm, lv_signal_t sign, void * pa
             if(btn_pr != LV_BTNMATRIX_BTN_NONE &&
                button_is_inactive(ext->ctrl_bits[btn_pr]) == false &&
                button_is_hidden(ext->ctrl_bits[btn_pr]) == false) {
+                invalidate_button_area(btnm, btn_pr);
                 /* Send VALUE_CHANGED for the newly pressed button */
-                uint32_t b = btn_pr;
-                res        = lv_event_send(btnm, LV_EVENT_VALUE_CHANGED, &b);
-                if(res == LV_RES_OK) {
-                    invalidate_button_area(btnm, btn_pr);
+                if(button_is_click_trig(ext->ctrl_bits[btn_pr]) == false) {
+                    uint32_t b = btn_pr;
+                    lv_event_send(btnm, LV_EVENT_VALUE_CHANGED, &b);
                 }
             }
         }
@@ -912,7 +919,7 @@ static lv_res_t lv_btnmatrix_signal(lv_obj_t * btnm, lv_signal_t sign, void * pa
             /*Toggle the button if enabled*/
             if(button_is_tgl_enabled(ext->ctrl_bits[ext->btn_id_pr]) &&
                !button_is_inactive(ext->ctrl_bits[ext->btn_id_pr])) {
-                if(button_get_tgl_state(ext->ctrl_bits[ext->btn_id_pr])) {
+                if(button_get_tgl_state(ext->ctrl_bits[ext->btn_id_pr]) && !ext->one_check) {
                     ext->ctrl_bits[ext->btn_id_pr] &= (~LV_BTNMATRIX_CTRL_CHECK_STATE);
                 }
                 else {
@@ -1204,18 +1211,25 @@ static uint16_t get_button_from_point(lv_obj_t * btnm, lv_point_t * p)
     /*Get the half inner padding. Button look larger with this value. (+1 for rounding error)*/
     pinner = (pinner / 2) + 1 + (pinner & 1);
 
+    pinner = LV_MATH_MIN(pinner, BTN_EXTRA_CLICK_AREA_MAX);
+    pright = LV_MATH_MIN(pright, BTN_EXTRA_CLICK_AREA_MAX);
+    ptop = LV_MATH_MIN(ptop, BTN_EXTRA_CLICK_AREA_MAX);
+    pbottom = LV_MATH_MIN(pbottom, BTN_EXTRA_CLICK_AREA_MAX);
+
     for(i = 0; i < ext->btn_cnt; i++) {
         lv_area_copy(&btn_area, &ext->button_areas[i]);
-        if(btn_area.x1 <= pleft) btn_area.x1 = btnm_cords.x1;
+        if(btn_area.x1 <= pleft) btn_area.x1 += btnm_cords.x1 - LV_MATH_MIN(pleft, BTN_EXTRA_CLICK_AREA_MAX);
         else btn_area.x1 += btnm_cords.x1 - pinner;
 
-        if(btn_area.y1 <= ptop) btn_area.y1 = btnm_cords.y1;
+        if(btn_area.y1 <= ptop) btn_area.y1 += btnm_cords.y1 - LV_MATH_MIN(ptop, BTN_EXTRA_CLICK_AREA_MAX);
         else btn_area.y1 += btnm_cords.y1 - pinner;
 
-        if(btn_area.x2 >= w - pright - 2) btn_area.x2 = btnm_cords.x2;  /*-2 for rounding error*/
+        if(btn_area.x2 >= w - pright - 2) btn_area.x2 += btnm_cords.x1 + LV_MATH_MIN(pright,
+                                                                                         BTN_EXTRA_CLICK_AREA_MAX);  /*-2 for rounding error*/
         else btn_area.x2 += btnm_cords.x1 + pinner;
 
-        if(btn_area.y2 >= h - pbottom - 2) btn_area.y2 = btnm_cords.y2; /*-2 for rounding error*/
+        if(btn_area.y2 >= h - pbottom - 2) btn_area.y2 += btnm_cords.y1 + LV_MATH_MIN(pbottom,
+                                                                                          BTN_EXTRA_CLICK_AREA_MAX); /*-2 for rounding error*/
         else btn_area.y2 += btnm_cords.y1 + pinner;
 
         if(_lv_area_is_point_on(&btn_area, p, 0) != false) {

src/lv_widgets/lv_calendar.c

@@ -705,6 +705,7 @@ static void draw_header(lv_obj_t * calendar, const lv_area_t * mask)
     strcpy(&txt_buf[5], get_month_name(calendar, ext->showed_date.month));
 
     calendar->state = LV_STATE_DEFAULT;
+    _lv_obj_disable_style_caching(calendar, true);
 
     lv_draw_label_dsc_t label_dsc;
     lv_draw_label_dsc_init(&label_dsc);
@@ -738,6 +739,7 @@ static void draw_header(lv_obj_t * calendar, const lv_area_t * mask)
     lv_draw_label(&header_area, mask, &label_dsc, LV_SYMBOL_RIGHT, NULL);
 
     calendar->state = state_ori;    /*Restore the state*/
+    _lv_obj_disable_style_caching(calendar, false);
 }
 
 /**
@@ -810,6 +812,7 @@ static void draw_dates(lv_obj_t * calendar, const lv_area_t * clip_area)
     /*The state changes without re-caching the styles, disable the use of cache*/
     lv_state_t state_ori = calendar->state;
     calendar->state = LV_STATE_DEFAULT;
+    _lv_obj_disable_style_caching(calendar, true);
 
     lv_state_t month_state = LV_STATE_DISABLED;
 
@@ -856,6 +859,7 @@ static void draw_dates(lv_obj_t * calendar, const lv_area_t * clip_area)
 
         if(box_area.y1 > clip_area->y2) {
             calendar->state = state_ori;
+            _lv_obj_disable_style_caching(calendar, false);
             return;
         }
 
@@ -926,6 +930,7 @@ static void draw_dates(lv_obj_t * calendar, const lv_area_t * clip_area)
         }
     }
     calendar->state = state_ori;
+    _lv_obj_disable_style_caching(calendar, false);
 
 
 }

src/lv_widgets/lv_canvas.c

@@ -657,6 +657,7 @@ void lv_canvas_blur_ver(lv_obj_t * canvas, const lv_area_t * area, uint16_t r)
  * Fill the canvas with color
  * @param canvas pointer to a canvas
  * @param color the background color
+ * @param opa the desired opacity
  */
 void lv_canvas_fill_bg(lv_obj_t * canvas, lv_color_t color, lv_opa_t opa)
 {
@@ -694,10 +695,10 @@ void lv_canvas_fill_bg(lv_obj_t * canvas, lv_color_t color, lv_opa_t opa)
  * @param y top coordinate of the rectangle
  * @param w width of the rectangle
  * @param h height of the rectangle
- * @param style style of the rectangle (`body` properties are used except `padding`)
+ * @param rect_dsc descriptor of the rectangle
  */
 void lv_canvas_draw_rect(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord_t w, lv_coord_t h,
-                         lv_draw_rect_dsc_t * rect_dsc)
+                         const lv_draw_rect_dsc_t * rect_dsc)
 {
     LV_ASSERT_OBJ(canvas, LV_OBJX_NAME);
 
@@ -763,7 +764,7 @@ void lv_canvas_draw_rect(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord
  * @param x left coordinate of the text
  * @param y top coordinate of the text
  * @param max_w max width of the text. The text will be wrapped to fit into this size
- * @param style style of the text (`text` properties are used)
+ * @param label_draw_dsc pointer to a valid label descriptor `lv_draw_label_dsc_t`
  * @param txt text to display
  * @param align align of the text (`LV_LABEL_ALIGN_LEFT/RIGHT/CENTER`)
  */
@@ -841,10 +842,10 @@ void lv_canvas_draw_text(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord
  * Draw an image on the canvas
  * @param canvas pointer to a canvas object
  * @param src image source. Can be a pointer an `lv_img_dsc_t` variable or a path an image.
- * @param style style of the image (`image` properties are used)
+ * @param img_draw_dsc pointer to a valid label descriptor `lv_draw_img_dsc_t`
  */
 void lv_canvas_draw_img(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, const void * src,
-                        lv_draw_img_dsc_t * img_draw_dsc)
+                        const lv_draw_img_dsc_t * img_draw_dsc)
 {
     LV_ASSERT_OBJ(canvas, LV_OBJX_NAME);
 
@@ -906,10 +907,10 @@ void lv_canvas_draw_img(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, const voi
  * @param canvas pointer to a canvas object
  * @param points point of the line
  * @param point_cnt number of points
- * @param style style of the line (`line` properties are used)
+ * @param line_draw_dsc pointer to an initialized `lv_draw_line_dsc_t` variable
  */
 void lv_canvas_draw_line(lv_obj_t * canvas, const lv_point_t points[], uint32_t point_cnt,
-                         lv_draw_line_dsc_t * line_draw_dsc)
+                         const lv_draw_line_dsc_t * line_draw_dsc)
 {
     LV_ASSERT_OBJ(canvas, LV_OBJX_NAME);
 
@@ -969,10 +970,10 @@ void lv_canvas_draw_line(lv_obj_t * canvas, const lv_point_t points[], uint32_t
  * @param canvas pointer to a canvas object
  * @param points point of the polygon
  * @param point_cnt number of points
- * @param style style of the polygon (`body.main_color` and `body.opa` is used)
+ * @param poly_draw_dsc pointer to an initialized `lv_draw_rect_dsc_t` variable
  */
 void lv_canvas_draw_polygon(lv_obj_t * canvas, const lv_point_t points[], uint32_t point_cnt,
-                            lv_draw_rect_dsc_t * poly_draw_dsc)
+                            const lv_draw_rect_dsc_t * poly_draw_dsc)
 {
     LV_ASSERT_OBJ(canvas, LV_OBJX_NAME);
 
@@ -1033,10 +1034,10 @@ void lv_canvas_draw_polygon(lv_obj_t * canvas, const lv_point_t points[], uint32
  * @param r radius of the arc
  * @param start_angle start angle in degrees
  * @param end_angle end angle in degrees
- * @param style style of the polygon (`body.main_color` and `body.opa` is used)
+ * @param arc_draw_dsc pointer to an initialized `lv_draw_line_dsc_t` variable
  */
 void lv_canvas_draw_arc(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord_t r, int32_t start_angle,
-                        int32_t end_angle, lv_draw_line_dsc_t * arc_draw_dsc)
+                        int32_t end_angle, const lv_draw_line_dsc_t * arc_draw_dsc)
 {
     LV_ASSERT_OBJ(canvas, LV_OBJX_NAME);
 

src/lv_widgets/lv_canvas.h

@@ -153,6 +153,7 @@ void lv_canvas_transform(lv_obj_t * canvas, lv_img_dsc_t * img, int16_t angle, u
 /**
  * Apply horizontal blur on the canvas
  * @param canvas pointer to a canvas object
+ * @param area the area to blur. If `NULL` the whole canvas will be blurred.
  * @param r radius of the blur
  */
 void lv_canvas_blur_hor(lv_obj_t * canvas, const lv_area_t * area, uint16_t r);
@@ -169,6 +170,7 @@ void lv_canvas_blur_ver(lv_obj_t * canvas, const lv_area_t * area, uint16_t r);
  * Fill the canvas with color
  * @param canvas pointer to a canvas
  * @param color the background color
+ * @param opa the desired opacity
  */
 void lv_canvas_fill_bg(lv_obj_t * canvas, lv_color_t color, lv_opa_t opa);
 
@@ -179,10 +181,10 @@ void lv_canvas_fill_bg(lv_obj_t * canvas, lv_color_t color, lv_opa_t opa);
  * @param y top coordinate of the rectangle
  * @param w width of the rectangle
  * @param h height of the rectangle
- * @param style style of the rectangle (`body` properties are used except `padding`)
+ * @param rect_dsc descriptor of the rectangle
  */
 void lv_canvas_draw_rect(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord_t w, lv_coord_t h,
-                         lv_draw_rect_dsc_t * rect_dsc);
+                         const lv_draw_rect_dsc_t * rect_dsc);
 
 /**
  * Draw a text on the canvas.
@@ -190,7 +192,7 @@ void lv_canvas_draw_rect(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord
  * @param x left coordinate of the text
  * @param y top coordinate of the text
  * @param max_w max width of the text. The text will be wrapped to fit into this size
- * @param style style of the text (`text` properties are used)
+ * @param label_draw_dsc pointer to a valid label descriptor `lv_draw_label_dsc_t`
  * @param txt text to display
  * @param align align of the text (`LV_LABEL_ALIGN_LEFT/RIGHT/CENTER`)
  */
@@ -201,31 +203,33 @@ void lv_canvas_draw_text(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord
 /**
  * Draw an image on the canvas
  * @param canvas pointer to a canvas object
+ * @param x left coordinate of the image
+ * @param y top coordinate of the image
  * @param src image source. Can be a pointer an `lv_img_dsc_t` variable or a path an image.
- * @param style style of the image (`image` properties are used)
+ * @param img_draw_dsc pointer to a valid label descriptor `lv_draw_img_dsc_t`
  */
 void lv_canvas_draw_img(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, const void * src,
-                        lv_draw_img_dsc_t * img_draw_dsc);
+                        const lv_draw_img_dsc_t * img_draw_dsc);
 
 /**
  * Draw a line on the canvas
  * @param canvas pointer to a canvas object
  * @param points point of the line
  * @param point_cnt number of points
- * @param style style of the line (`line` properties are used)
+ * @param line_draw_dsc pointer to an initialized `lv_draw_line_dsc_t` variable
  */
 void lv_canvas_draw_line(lv_obj_t * canvas, const lv_point_t points[], uint32_t point_cnt,
-                         lv_draw_line_dsc_t * line_draw_dsc);
+                         const lv_draw_line_dsc_t * line_draw_dsc);
 
 /**
  * Draw a polygon on the canvas
  * @param canvas pointer to a canvas object
  * @param points point of the polygon
  * @param point_cnt number of points
- * @param style style of the polygon (`body.main_color` and `body.opa` is used)
+ * @param poly_draw_dsc pointer to an initialized `lv_draw_rect_dsc_t` variable
  */
 void lv_canvas_draw_polygon(lv_obj_t * canvas, const lv_point_t points[], uint32_t point_cnt,
-                            lv_draw_rect_dsc_t * poly_draw_dsc);
+                            const lv_draw_rect_dsc_t * poly_draw_dsc);
 
 /**
  * Draw an arc on the canvas
@@ -235,10 +239,10 @@ void lv_canvas_draw_polygon(lv_obj_t * canvas, const lv_point_t points[], uint32
  * @param r radius of the arc
  * @param start_angle start angle in degrees
  * @param end_angle end angle in degrees
- * @param style style of the polygon (`body.main_color` and `body.opa` is used)
+ * @param arc_draw_dsc pointer to an initialized `lv_draw_line_dsc_t` variable
  */
 void lv_canvas_draw_arc(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord_t r, int32_t start_angle,
-                        int32_t end_angle, lv_draw_line_dsc_t * arc_draw_dsc);
+                        int32_t end_angle, const lv_draw_line_dsc_t * arc_draw_dsc);
 
 /**********************
  *      MACROS

src/lv_widgets/lv_chart.c

@@ -152,7 +152,7 @@ lv_obj_t * lv_chart_create(lv_obj_t * par, const lv_obj_t * copy)
         _lv_memcpy(&ext->secondary_y_axis, &ext_copy->secondary_y_axis, sizeof(lv_chart_axis_cfg_t));
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(chart, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(chart, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("chart created");
@@ -207,23 +207,23 @@ lv_chart_series_t * lv_chart_add_series(lv_obj_t * chart, lv_color_t color)
 /**
  * Clear the point of a series
  * @param chart pointer to a chart object
- * @param serie pointer to the chart's series to clear
+ * @param series pointer to the chart's series to clear
  */
-void lv_chart_clear_serie(lv_obj_t * chart, lv_chart_series_t * serie)
+void lv_chart_clear_series(lv_obj_t * chart, lv_chart_series_t * series)
 {
     LV_ASSERT_OBJ(chart, LV_OBJX_NAME);
-    LV_ASSERT_NULL(serie);
+    LV_ASSERT_NULL(series);
 
-    if(chart == NULL || serie == NULL) return;
+    if(chart == NULL || series == NULL) return;
     lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
     if(ext == NULL) return;
 
     uint32_t i;
     for(i = 0; i < ext->point_cnt; i++) {
-        serie->points[i] = LV_CHART_POINT_DEF;
+        series->points[i] = LV_CHART_POINT_DEF;
     }
 
-    serie->start_point = 0;
+    series->start_point = 0;
 }
 
 /*=====================

src/lv_widgets/lv_chart.h

@@ -139,9 +139,9 @@ lv_chart_series_t * lv_chart_add_series(lv_obj_t * chart, lv_color_t color);
 /**
  * Clear the point of a series
  * @param chart pointer to a chart object
- * @param serie pointer to the chart's series to clear
+ * @param series pointer to the chart's series to clear
  */
-void lv_chart_clear_serie(lv_obj_t * chart, lv_chart_series_t * serie);
+void lv_chart_clear_series(lv_obj_t * chart, lv_chart_series_t * series);
 
 /*=====================
  * Setter functions

src/lv_widgets/lv_cont.c

@@ -112,7 +112,7 @@ lv_obj_t * lv_cont_create(lv_obj_t * par, const lv_obj_t * copy)
         ext->layout              = copy_ext->layout;
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(cont, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(cont, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("container created");

src/lv_widgets/lv_cpicker.c

@@ -48,6 +48,13 @@
 
 #define TRI_OFFSET 2
 
+/* The OUTER_MASK_WIDTH define is required to assist with the placing of a mask over the outer ring of the widget as when the
+ * multicoloured radial lines are calculated for the outer ring of the widget their lengths are jittering because of the
+ * integer based arithmetic. From tests the maximum delta was found to be 2 so the current value is set to 3 to achieve
+ * appropriate masking.
+ */
+#define OUTER_MASK_WIDTH 3
+
 /**********************
  *      TYPEDEFS
  **********************/
@@ -144,7 +151,7 @@ lv_obj_t * lv_cpicker_create(lv_obj_t * par, const lv_obj_t * copy)
 
         lv_style_list_copy(&ext->knob.style_list, &copy_ext->knob.style_list);
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(cpicker, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(cpicker, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
     refr_knob_pos(cpicker);
 
@@ -237,9 +244,7 @@ bool lv_cpicker_set_hsv(lv_obj_t * cpicker, lv_color_hsv_t hsv)
 
     refr_knob_pos(cpicker);
 
-    if(ext->type == LV_CPICKER_TYPE_DISC) {
-        lv_obj_invalidate(cpicker);
-    }
+    lv_obj_invalidate(cpicker);
 
     return true;
 }
@@ -483,6 +488,17 @@ static void draw_disc_grad(lv_obj_t * cpicker, const lv_area_t * mask)
     uint16_t i;
     lv_coord_t cir_w = lv_obj_get_style_scale_width(cpicker, LV_CPICKER_PART_MAIN);
 
+    /* Mask outer ring of widget to tidy up ragged edges of lines while drawing outer ring */
+    lv_area_t mask_area_out;
+    lv_area_copy(&mask_area_out, &cpicker->coords);
+    mask_area_out.x1 += OUTER_MASK_WIDTH;
+    mask_area_out.x2 -= OUTER_MASK_WIDTH;
+    mask_area_out.y1 += OUTER_MASK_WIDTH;
+    mask_area_out.y2 -= OUTER_MASK_WIDTH;
+    lv_draw_mask_radius_param_t mask_out_param;
+    lv_draw_mask_radius_init(&mask_out_param, &mask_area_out, LV_RADIUS_CIRCLE, false);
+    int16_t mask_out_id = lv_draw_mask_add(&mask_out_param, 0);
+
     /* The inner line ends will be masked out.
      * So make lines a little bit longer because the masking makes a more even result */
     lv_coord_t cir_w_extra = cir_w + line_dsc.width;
@@ -498,7 +514,8 @@ static void draw_disc_grad(lv_obj_t * cpicker, const lv_area_t * mask)
 
         lv_draw_line(&p[0], &p[1], mask, &line_dsc);
     }
-
+    /* Now remove mask to continue with inner part */
+    lv_draw_mask_remove_id(mask_out_id);
 
     /*Mask out the inner area*/
     lv_draw_rect_dsc_t bg_dsc;

src/lv_widgets/lv_dropdown.c

@@ -609,7 +609,7 @@ void lv_dropdown_open(lv_obj_t * ddlist)
     lv_style_list_copy(lv_obj_get_style_list(ext->page, LV_PAGE_PART_BG), &ext->style_page);
     lv_style_list_copy(lv_obj_get_style_list(ext->page, LV_PAGE_PART_SCROLLBAR), &ext->style_scrlbar);
     lv_obj_clean_style_list(ext->page, LV_PAGE_PART_SCROLLABLE);
-    lv_obj_refresh_style(ext->page, LV_STYLE_PROP_ALL);
+    lv_obj_refresh_style(ext->page, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
 
     lv_obj_t * label = lv_label_create(ext->page, NULL);
     lv_label_set_text_static(label, ext->options);
@@ -965,7 +965,7 @@ static lv_res_t lv_dropdown_signal(lv_obj_t * ddlist, lv_signal_t sign, void * p
         const lv_font_t * font = lv_obj_get_style_text_font(ddlist, LV_DROPDOWN_PART_MAIN);
         lv_obj_set_height(ddlist, top + bottom + lv_font_get_line_height(font));
 
-        if(ext->page) lv_obj_refresh_style(ext->page, LV_STYLE_PROP_ALL);
+        if(ext->page) lv_obj_refresh_style(ext->page, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
     else if(sign == LV_SIGNAL_CONTROL) {
 #if LV_USE_GROUP
@@ -1134,8 +1134,10 @@ static void draw_box(lv_obj_t * ddlist, const lv_area_t * clip_area, uint16_t id
     lv_obj_t * page = ext->page;
     lv_state_t state_orig = page->state;
 
-    page->state = LV_STATE_DEFAULT;
-    page->state |= state;
+    if(state != page->state) {
+        _lv_obj_disable_style_caching(ddlist, true);
+        page->state = state;
+    }
 
     /*Draw a rectangle under the selected item*/
     const lv_font_t * font    = lv_obj_get_style_text_font(ddlist, LV_DROPDOWN_PART_LIST);
@@ -1159,6 +1161,7 @@ static void draw_box(lv_obj_t * ddlist, const lv_area_t * clip_area, uint16_t id
     lv_draw_rect(&rect_area, clip_area, &sel_rect);
 
     page->state = state_orig;
+    _lv_obj_disable_style_caching(ddlist, false);
 }
 
 
@@ -1169,8 +1172,10 @@ static void draw_box_label(lv_obj_t * ddlist, const lv_area_t * clip_area, uint1
     lv_obj_t * page = ext->page;
     lv_state_t state_orig = page->state;
 
-    page->state = LV_STATE_DEFAULT;
-    page->state |= state;
+    if(state != page->state) {
+        page->state =  state;
+        _lv_obj_disable_style_caching(ddlist, true);
+    }
 
     lv_draw_label_dsc_t label_dsc;
     lv_draw_label_dsc_init(&label_dsc);
@@ -1204,6 +1209,7 @@ static void draw_box_label(lv_obj_t * ddlist, const lv_area_t * clip_area, uint1
         lv_draw_label(&label->coords, &mask_sel, &label_dsc, lv_label_get_text(label), NULL);
     }
     page->state = state_orig;
+    _lv_obj_disable_style_caching(ddlist, false);
 }
 
 /**

src/lv_widgets/lv_gauge.c

@@ -124,7 +124,7 @@ lv_obj_t * lv_gauge_create(lv_obj_t * par, const lv_obj_t * copy)
         ext->format_cb   = copy_ext->format_cb;
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(gauge, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(gauge, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("gauge created");
@@ -589,15 +589,6 @@ static void lv_gauge_draw_needle(lv_obj_t * gauge, const lv_area_t * clip_area)
     lv_draw_line_dsc_init(&line_dsc);
     lv_obj_init_draw_line_dsc(gauge, LV_GAUGE_PART_NEEDLE, &line_dsc);
 
-    lv_draw_img_dsc_t img_dsc;
-    if(ext->needle_img == NULL) {
-        lv_draw_img_dsc_init(&img_dsc);
-        lv_obj_init_draw_img_dsc(gauge, LV_GAUGE_PART_MAIN, &img_dsc);
-        img_dsc.recolor_opa = LV_OPA_COVER;
-        img_dsc.pivot.x = ext->needle_img_pivot.x;
-        img_dsc.pivot.y = ext->needle_img_pivot.y;
-    }
-
     p_mid.x = x_ofs;
     p_mid.y = y_ofs;
     for(i = 0; i < ext->needle_count; i++) {
@@ -625,10 +616,17 @@ static void lv_gauge_draw_needle(lv_obj_t * gauge, const lv_area_t * clip_area)
             a.y1 = gauge->coords.y1 + lv_area_get_height(&gauge->coords) / 2  - ext->needle_img_pivot.y;
             a.x2 = a.x1 + info.w - 1;
             a.y2 = a.y1 + info.h - 1;
+            lv_draw_img_dsc_t img_dsc;
+            lv_draw_img_dsc_init(&img_dsc);
+            lv_obj_init_draw_img_dsc(gauge, LV_GAUGE_PART_MAIN, &img_dsc);
+            img_dsc.pivot.x = ext->needle_img_pivot.x;
+            img_dsc.pivot.y = ext->needle_img_pivot.y;
 
             if(ext->needle_colors != NULL)
                 img_dsc.recolor = ext->needle_colors[i];
 
+            needle_angle = (needle_angle * 10);
+            if(needle_angle > 3600) needle_angle -= 3600;
             img_dsc.angle = needle_angle;
             lv_draw_img(&a, clip_area, ext->needle_img, &img_dsc);
         }

src/lv_widgets/lv_img.c

@@ -121,7 +121,7 @@ lv_obj_t * lv_img_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_img_set_src(img, copy_ext->src);
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(img, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(img, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("image created");
@@ -303,8 +303,10 @@ void lv_img_set_pivot(lv_obj_t * img, lv_coord_t pivot_x, lv_coord_t pivot_y)
     lv_style_int_t transf_angle = lv_obj_get_style_transform_angle(img, LV_IMG_PART_MAIN);
     transf_angle += ext->angle;
 
+    lv_coord_t w = lv_obj_get_width(img);
+    lv_coord_t h = lv_obj_get_height(img);
     lv_area_t a;
-    _lv_img_buf_get_transformed_area(&a, ext->w, ext->h, transf_angle, transf_zoom, &ext->pivot);
+    _lv_img_buf_get_transformed_area(&a, w, h, transf_angle, transf_zoom, &ext->pivot);
     a.x1 += img->coords.x1;
     a.y1 += img->coords.y1;
     a.x2 += img->coords.x1;
@@ -315,7 +317,7 @@ void lv_img_set_pivot(lv_obj_t * img, lv_coord_t pivot_x, lv_coord_t pivot_y)
     ext->pivot.y = pivot_y;
     lv_obj_refresh_ext_draw_pad(img);
 
-    _lv_img_buf_get_transformed_area(&a, ext->w, ext->h, transf_angle, transf_zoom, &ext->pivot);
+    _lv_img_buf_get_transformed_area(&a, w, h, transf_angle, transf_zoom, &ext->pivot);
     a.x1 += img->coords.x1;
     a.y1 += img->coords.y1;
     a.x2 += img->coords.x1;
@@ -341,8 +343,10 @@ void lv_img_set_angle(lv_obj_t * img, int16_t angle)
 
     lv_style_int_t transf_angle = lv_obj_get_style_transform_angle(img, LV_IMG_PART_MAIN);
 
+    lv_coord_t w = lv_obj_get_width(img);
+    lv_coord_t h = lv_obj_get_height(img);
     lv_area_t a;
-    _lv_img_buf_get_transformed_area(&a, ext->w, ext->h, transf_angle + ext->angle, transf_zoom, &ext->pivot);
+    _lv_img_buf_get_transformed_area(&a, w, h, transf_angle + ext->angle, transf_zoom, &ext->pivot);
     a.x1 += img->coords.x1;
     a.y1 += img->coords.y1;
     a.x2 += img->coords.x1;
@@ -352,7 +356,7 @@ void lv_img_set_angle(lv_obj_t * img, int16_t angle)
     ext->angle = angle;
     lv_obj_refresh_ext_draw_pad(img);
 
-    _lv_img_buf_get_transformed_area(&a, ext->w, ext->h, transf_angle + ext->angle, transf_zoom, &ext->pivot);
+    _lv_img_buf_get_transformed_area(&a, w, h, transf_angle + ext->angle, transf_zoom, &ext->pivot);
     a.x1 += img->coords.x1;
     a.y1 += img->coords.y1;
     a.x2 += img->coords.x1;
@@ -382,8 +386,10 @@ void lv_img_set_zoom(lv_obj_t * img, uint16_t zoom)
     lv_style_int_t transf_angle = lv_obj_get_style_transform_angle(img, LV_IMG_PART_MAIN);
     transf_angle += ext->angle;
 
+    lv_coord_t w = lv_obj_get_width(img);
+    lv_coord_t h = lv_obj_get_height(img);
     lv_area_t a;
-    _lv_img_buf_get_transformed_area(&a, ext->w, ext->h, transf_angle, (transf_zoom * ext->zoom) >> 8, &ext->pivot);
+    _lv_img_buf_get_transformed_area(&a, w, h, transf_angle, (transf_zoom * ext->zoom) >> 8, &ext->pivot);
     a.x1 += img->coords.x1;
     a.y1 += img->coords.y1;
     a.x2 += img->coords.x1;
@@ -393,7 +399,7 @@ void lv_img_set_zoom(lv_obj_t * img, uint16_t zoom)
     ext->zoom = zoom;
     lv_obj_refresh_ext_draw_pad(img);
 
-    _lv_img_buf_get_transformed_area(&a, ext->w, ext->h, transf_angle, (transf_zoom * ext->zoom) >> 8, &ext->pivot);
+    _lv_img_buf_get_transformed_area(&a, w, h, transf_angle, (transf_zoom * ext->zoom) >> 8, &ext->pivot);
     a.x1 += img->coords.x1;
     a.y1 += img->coords.y1;
     a.x2 += img->coords.x1;
@@ -567,7 +573,6 @@ static lv_design_res_t lv_img_design(lv_obj_t * img, const lv_area_t * clip_area
     lv_img_ext_t * ext       = lv_obj_get_ext_attr(img);
 
     if(mode == LV_DESIGN_COVER_CHK) {
-
         if(lv_obj_get_style_clip_corner(img, LV_IMG_PART_MAIN)) return LV_DESIGN_RES_MASKED;
 
         if(ext->src_type == LV_IMG_SRC_UNKNOWN || ext->src_type == LV_IMG_SRC_SYMBOL) return LV_DESIGN_RES_NOT_COVER;
@@ -575,15 +580,18 @@ static lv_design_res_t lv_img_design(lv_obj_t * img, const lv_area_t * clip_area
         /*Non true color format might have "holes"*/
         if(ext->cf != LV_IMG_CF_TRUE_COLOR && ext->cf != LV_IMG_CF_RAW) return LV_DESIGN_RES_NOT_COVER;
 
+        /*With not LV_OPA_COVER images acn't cover an area */
+        if(lv_obj_get_style_image_opa(img, LV_IMG_PART_MAIN) != LV_OPA_COVER) return LV_DESIGN_RES_NOT_COVER;
+
         int32_t angle_final = lv_obj_get_style_transform_angle(img, LV_IMG_PART_MAIN);
         angle_final += ext->angle;
 
-        if(angle_final == 0) return LV_DESIGN_RES_NOT_COVER;
+        if(angle_final != 0) return LV_DESIGN_RES_NOT_COVER;
 
         int32_t zoom_final = lv_obj_get_style_transform_zoom(img, LV_IMG_PART_MAIN);
         zoom_final = (zoom_final * ext->zoom) >> 8;
 
-        if(zoom_final != LV_IMG_ZOOM_NONE) {
+        if(zoom_final == LV_IMG_ZOOM_NONE) {
             if(_lv_area_is_in(clip_area, &img->coords, 0) == false) return LV_DESIGN_RES_NOT_COVER;
         }
         else {
@@ -597,15 +605,15 @@ static lv_design_res_t lv_img_design(lv_obj_t * img, const lv_area_t * clip_area
             if(_lv_area_is_in(clip_area, &a, 0) == false) return LV_DESIGN_RES_NOT_COVER;
         }
 
-        if(lv_obj_get_style_image_opa(img, LV_IMG_PART_MAIN) != LV_OPA_COVER) return LV_DESIGN_RES_NOT_COVER;
+#if LV_USE_BLEND_MODES
+        if(lv_obj_get_style_bg_blend_mode(img, LV_IMG_PART_MAIN) != LV_BLEND_MODE_NORMAL) return LV_DESIGN_RES_NOT_COVER;
+        if(lv_obj_get_style_image_blend_mode(img, LV_IMG_PART_MAIN) != LV_BLEND_MODE_NORMAL) return LV_DESIGN_RES_NOT_COVER;
+#endif
 
         return LV_DESIGN_RES_COVER;
     }
     else if(mode == LV_DESIGN_DRAW_MAIN) {
         if(ext->h == 0 || ext->w == 0) return true;
-        lv_area_t img_coords;
-
-        lv_obj_get_coords(img, &img_coords);
 
         lv_draw_rect_dsc_t bg_dsc;
         lv_draw_rect_dsc_init(&bg_dsc);
@@ -620,18 +628,19 @@ static lv_design_res_t lv_img_design(lv_obj_t * img, const lv_area_t * clip_area
         int32_t zoom_final = lv_obj_get_style_transform_zoom(img, LV_IMG_PART_MAIN);
         zoom_final = (zoom_final * ext->zoom) >> 8;
 
-        if(zoom_final == 0) return LV_DESIGN_RES_OK;
-
         int32_t angle_final = lv_obj_get_style_transform_angle(img, LV_IMG_PART_MAIN);
         angle_final += ext->angle;
 
+        lv_coord_t obj_w = lv_obj_get_width(img);
+        lv_coord_t obj_h = lv_obj_get_height(img);
+
         lv_area_t bg_coords;
-        _lv_img_buf_get_transformed_area(&bg_coords, lv_area_get_width(&img_coords), lv_area_get_height(&img_coords),
+        _lv_img_buf_get_transformed_area(&bg_coords, obj_w, obj_h,
                                          angle_final, zoom_final, &ext->pivot);
-        bg_coords.x1 += img_coords.x1;
-        bg_coords.y1 += img_coords.y1;
-        bg_coords.x2 += img_coords.x1;
-        bg_coords.y2 += img_coords.y1;
+        bg_coords.x1 += img->coords.x1;
+        bg_coords.y1 += img->coords.y1;
+        bg_coords.x2 += img->coords.x1;
+        bg_coords.y2 += img->coords.y1;
         bg_coords.x1 -= lv_obj_get_style_pad_left(img, LV_IMG_PART_MAIN);
         bg_coords.x2 += lv_obj_get_style_pad_right(img, LV_IMG_PART_MAIN);
         bg_coords.y1 -= lv_obj_get_style_pad_top(img, LV_IMG_PART_MAIN);
@@ -639,6 +648,8 @@ static lv_design_res_t lv_img_design(lv_obj_t * img, const lv_area_t * clip_area
 
         lv_draw_rect(&bg_coords, clip_area, &bg_dsc);
 
+        if(zoom_final == 0) return LV_DESIGN_RES_OK;
+
         if(lv_obj_get_style_clip_corner(img, LV_OBJ_PART_MAIN)) {
             lv_draw_mask_radius_param_t * mp = _lv_mem_buf_get(sizeof(lv_draw_mask_radius_param_t));
 
@@ -650,12 +661,6 @@ static lv_design_res_t lv_img_design(lv_obj_t * img, const lv_area_t * clip_area
         }
 
         if(ext->src_type == LV_IMG_SRC_FILE || ext->src_type == LV_IMG_SRC_VARIABLE) {
-            img_coords.x1 += ext->offset.x;
-            img_coords.y1 += ext->offset.y;
-
-            if(img_coords.x1 > img->coords.x1) img_coords.x1 -= ext->w;
-            if(img_coords.y1 > img->coords.y1) img_coords.y1 -= ext->h;
-
             LV_LOG_TRACE("lv_img_design: start to draw image");
 
             lv_draw_img_dsc_t img_dsc;
@@ -672,15 +677,40 @@ static lv_design_res_t lv_img_design(lv_obj_t * img, const lv_area_t * clip_area
             img_dsc.pivot.y = ext->pivot.y;
             img_dsc.antialias = ext->antialias;
 
-            lv_area_t cords_tmp;
-            cords_tmp.y1 = img_coords.y1;
-            cords_tmp.y2 = img_coords.y1 + ext->h - 1;
+            lv_coord_t zoomed_src_w = (int32_t)((int32_t)ext->w * zoom_final) >> 8;
+            if(zoomed_src_w <= 0) return LV_DESIGN_RES_OK;
+            lv_coord_t zoomed_src_h = (int32_t)((int32_t)ext->h * zoom_final) >> 8;
+            if(zoomed_src_h <= 0) return LV_DESIGN_RES_OK;
+            lv_area_t zommed_coords;
+            lv_obj_get_coords(img, &zommed_coords);
 
-            for(; cords_tmp.y1 <= img_coords.y2; cords_tmp.y1 += ext->h, cords_tmp.y2 += ext->h) {
-                cords_tmp.x1 = img_coords.x1;
-                cords_tmp.x2 = img_coords.x1 + ext->w - 1;
-                for(; cords_tmp.x1 <= img_coords.x2; cords_tmp.x1 += ext->w, cords_tmp.x2 += ext->w) {
-                    lv_draw_img(&cords_tmp, clip_area, ext->src, &img_dsc);
+            zommed_coords.x1 += (int32_t)((int32_t)ext->offset.x * zoom_final) >> 8;
+            zommed_coords.y1 += (int32_t)((int32_t)ext->offset.y * zoom_final) >> 8;
+            zommed_coords.x2 = zommed_coords.x1 + ((int32_t)((int32_t)(obj_w - 1) * zoom_final) >> 8);
+            zommed_coords.y2 = zommed_coords.y1 + ((int32_t)((int32_t)(obj_h - 1) * zoom_final) >> 8);
+
+            if(zommed_coords.x1 > img->coords.x1) zommed_coords.x1 -= ext->w;
+            if(zommed_coords.y1 > img->coords.y1) zommed_coords.y1 -= ext->h;
+
+            lv_area_t clip_real;
+            _lv_img_buf_get_transformed_area(&clip_real, lv_obj_get_width(img), lv_obj_get_height(img), angle_final, zoom_final,
+                                             &ext->pivot);
+            clip_real.x1 += img->coords.x1;
+            clip_real.x2 += img->coords.x1;
+            clip_real.y1 += img->coords.y1;
+            clip_real.y2 += img->coords.y1;
+
+            if(_lv_area_intersect(&clip_real, &clip_real, clip_area) == false) return LV_DESIGN_RES_OK;
+
+            lv_area_t coords_tmp;
+            coords_tmp.y1 = zommed_coords.y1;
+            coords_tmp.y2 = zommed_coords.y1 + ext->h - 1;
+
+            for(; coords_tmp.y1 < zommed_coords.y2; coords_tmp.y1 += zoomed_src_h, coords_tmp.y2 += zoomed_src_h) {
+                coords_tmp.x1 = zommed_coords.x1;
+                coords_tmp.x2 = zommed_coords.x1 + ext->w - 1;
+                for(; coords_tmp.x1 < zommed_coords.x2; coords_tmp.x1 += zoomed_src_w, coords_tmp.x2 += zoomed_src_w) {
+                    lv_draw_img(&coords_tmp, &clip_real, ext->src, &img_dsc);
                 }
             }
         }
@@ -691,7 +721,7 @@ static lv_design_res_t lv_img_design(lv_obj_t * img, const lv_area_t * clip_area
             lv_obj_init_draw_label_dsc(img, LV_IMG_PART_MAIN, &label_dsc);
 
             label_dsc.color = lv_obj_get_style_image_recolor(img, LV_IMG_PART_MAIN);
-            lv_draw_label(&img_coords, clip_area, &label_dsc, ext->src, NULL);
+            lv_draw_label(&img->coords, clip_area, &label_dsc, ext->src, NULL);
         }
         else {
             /*Trigger the error handler of image drawer*/
@@ -705,15 +735,33 @@ static lv_design_res_t lv_img_design(lv_obj_t * img, const lv_area_t * clip_area
             _lv_mem_buf_release(param);
         }
 
-        lv_draw_rect_dsc_t draw_dsc;
-        lv_draw_rect_dsc_init(&draw_dsc);
-
         /*If the border is drawn later disable loading other properties*/
         if(lv_obj_get_style_border_post(img, LV_OBJ_PART_MAIN)) {
+            lv_draw_rect_dsc_t draw_dsc;
+            lv_draw_rect_dsc_init(&draw_dsc);
             draw_dsc.bg_opa = LV_OPA_TRANSP;
             draw_dsc.pattern_opa = LV_OPA_TRANSP;
             draw_dsc.shadow_opa = LV_OPA_TRANSP;
             lv_obj_init_draw_rect_dsc(img, LV_OBJ_PART_MAIN, &draw_dsc);
+
+            int32_t zoom_final = lv_obj_get_style_transform_zoom(img, LV_IMG_PART_MAIN);
+            zoom_final = (zoom_final * ext->zoom) >> 8;
+
+            int32_t angle_final = lv_obj_get_style_transform_angle(img, LV_IMG_PART_MAIN);
+            angle_final += ext->angle;
+
+            lv_area_t bg_coords;
+            _lv_img_buf_get_transformed_area(&bg_coords, lv_area_get_width(&img->coords), lv_area_get_height(&img->coords),
+                                             angle_final, zoom_final, &ext->pivot);
+            bg_coords.x1 += img->coords.x1;
+            bg_coords.y1 += img->coords.y1;
+            bg_coords.x2 += img->coords.x1;
+            bg_coords.y2 += img->coords.y1;
+            bg_coords.x1 -= lv_obj_get_style_pad_left(img, LV_IMG_PART_MAIN);
+            bg_coords.x2 += lv_obj_get_style_pad_right(img, LV_IMG_PART_MAIN);
+            bg_coords.y1 -= lv_obj_get_style_pad_top(img, LV_IMG_PART_MAIN);
+            bg_coords.y2 += lv_obj_get_style_pad_bottom(img, LV_IMG_PART_MAIN);
+
             lv_draw_rect(&img->coords, clip_area, &draw_dsc);
         }
     }
@@ -770,12 +818,14 @@ static lv_res_t lv_img_signal(lv_obj_t * img, lv_signal_t sign, void * param)
         /*If the image has angle provide enough room for the rotated corners */
         if(transf_angle || transf_zoom != LV_IMG_ZOOM_NONE) {
             lv_area_t a;
-            _lv_img_buf_get_transformed_area(&a, ext->w, ext->h, transf_angle, transf_zoom, &ext->pivot);
+            lv_coord_t w = lv_obj_get_width(img);
+            lv_coord_t h = lv_obj_get_height(img);
+            _lv_img_buf_get_transformed_area(&a, w, h, transf_angle, transf_zoom, &ext->pivot);
             lv_coord_t pad_ori = img->ext_draw_pad;
             img->ext_draw_pad = LV_MATH_MAX(img->ext_draw_pad, pad_ori - a.x1);
             img->ext_draw_pad = LV_MATH_MAX(img->ext_draw_pad, pad_ori - a.y1);
-            img->ext_draw_pad = LV_MATH_MAX(img->ext_draw_pad, pad_ori + a.x2 - ext->w);
-            img->ext_draw_pad = LV_MATH_MAX(img->ext_draw_pad, pad_ori + a.y2 - ext->h);
+            img->ext_draw_pad = LV_MATH_MAX(img->ext_draw_pad, pad_ori + a.x2 - w);
+            img->ext_draw_pad = LV_MATH_MAX(img->ext_draw_pad, pad_ori + a.y2 - h);
         }
 
         /*Handle the padding of the background*/
@@ -804,8 +854,10 @@ static lv_res_t lv_img_signal(lv_obj_t * img, lv_signal_t sign, void * param)
         if(ext->w == lv_obj_get_width(img) && ext->h == lv_obj_get_height(img) &&
            (zoom != LV_IMG_ZOOM_NONE || angle != 0 || ext->pivot.x != ext->w / 2 || ext->pivot.y != ext->h / 2)) {
 
+            lv_coord_t w = lv_obj_get_width(img);
+            lv_coord_t h = lv_obj_get_height(img);
             lv_area_t coords;
-            _lv_img_buf_get_transformed_area(&coords, ext->w, ext->h, angle, zoom, &ext->pivot);
+            _lv_img_buf_get_transformed_area(&coords, w, h, angle, zoom, &ext->pivot);
             coords.x1 += img->coords.x1;
             coords.y1 += img->coords.y1;
             coords.x2 += img->coords.x1;

src/lv_widgets/lv_imgbtn.c

@@ -100,7 +100,7 @@ lv_obj_t * lv_imgbtn_create(lv_obj_t * par, const lv_obj_t * copy)
 #endif
         ext->tiled = copy_ext->tiled;
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(imgbtn, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(imgbtn, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("image button created");
@@ -273,7 +273,38 @@ static lv_design_res_t lv_imgbtn_design(lv_obj_t * imgbtn, const lv_area_t * cli
     }
     /*Draw the object*/
     else if(mode == LV_DESIGN_DRAW_MAIN) {
-        ancestor_design(imgbtn, clip_area, mode);
+        lv_area_t img_coords;
+
+        lv_obj_get_coords(imgbtn, &img_coords);
+
+        lv_draw_rect_dsc_t bg_dsc;
+        lv_draw_rect_dsc_init(&bg_dsc);
+        lv_obj_init_draw_rect_dsc(imgbtn, LV_IMGBTN_PART_MAIN, &bg_dsc);
+
+        /*If the border is drawn later disable loading its properties*/
+        if(lv_obj_get_style_border_post(imgbtn, LV_OBJ_PART_MAIN)) {
+            bg_dsc.border_opa = LV_OPA_TRANSP;
+        }
+
+        lv_area_t bg_coords;
+        lv_area_copy(&bg_coords, &img_coords);
+        bg_coords.x1 -= lv_obj_get_style_pad_left(imgbtn, LV_IMGBTN_PART_MAIN);
+        bg_coords.x2 += lv_obj_get_style_pad_right(imgbtn, LV_IMGBTN_PART_MAIN);
+        bg_coords.y1 -= lv_obj_get_style_pad_top(imgbtn, LV_IMGBTN_PART_MAIN);
+        bg_coords.y2 += lv_obj_get_style_pad_bottom(imgbtn, LV_IMGBTN_PART_MAIN);
+
+        lv_draw_rect(&bg_coords, clip_area, &bg_dsc);
+
+        if(lv_obj_get_style_clip_corner(imgbtn, LV_OBJ_PART_MAIN)) {
+            lv_draw_mask_radius_param_t * mp = _lv_mem_buf_get(sizeof(lv_draw_mask_radius_param_t));
+
+            lv_coord_t r = lv_obj_get_style_radius(imgbtn, LV_OBJ_PART_MAIN);
+
+            lv_draw_mask_radius_init(mp, &bg_coords, r, false);
+            /*Add the mask and use `img+8` as custom id. Don't use `obj` directly because it might be used by the user*/
+            lv_draw_mask_add(mp, imgbtn + 8);
+        }
+
         /*Just draw an image*/
         lv_imgbtn_ext_t * ext    = lv_obj_get_ext_attr(imgbtn);
         lv_btn_state_t state     = lv_imgbtn_get_state(imgbtn);
@@ -374,6 +405,31 @@ static lv_design_res_t lv_imgbtn_design(lv_obj_t * imgbtn, const lv_area_t * cli
     }
     /*Post draw when the children are drawn*/
     else if(mode == LV_DESIGN_DRAW_POST) {
+        if(lv_obj_get_style_clip_corner(imgbtn, LV_OBJ_PART_MAIN)) {
+            lv_draw_mask_radius_param_t * param = lv_draw_mask_remove_custom(imgbtn + 8);
+            _lv_mem_buf_release(param);
+        }
+
+        lv_draw_rect_dsc_t draw_dsc;
+        lv_draw_rect_dsc_init(&draw_dsc);
+
+        /*If the border is drawn later disable loading other properties*/
+        if(lv_obj_get_style_border_post(imgbtn, LV_OBJ_PART_MAIN)) {
+            draw_dsc.bg_opa = LV_OPA_TRANSP;
+            draw_dsc.pattern_opa = LV_OPA_TRANSP;
+            draw_dsc.shadow_opa = LV_OPA_TRANSP;
+            lv_obj_init_draw_rect_dsc(imgbtn, LV_OBJ_PART_MAIN, &draw_dsc);
+
+
+            lv_area_t bg_coords;
+            lv_area_copy(&bg_coords, &imgbtn->coords);
+            bg_coords.x1 -= lv_obj_get_style_pad_left(imgbtn, LV_IMGBTN_PART_MAIN);
+            bg_coords.x2 += lv_obj_get_style_pad_right(imgbtn, LV_IMGBTN_PART_MAIN);
+            bg_coords.y1 -= lv_obj_get_style_pad_top(imgbtn, LV_IMGBTN_PART_MAIN);
+            bg_coords.y2 += lv_obj_get_style_pad_bottom(imgbtn, LV_IMGBTN_PART_MAIN);
+
+            lv_draw_rect(&bg_coords, clip_area, &draw_dsc);
+        }
     }
 
     return LV_DESIGN_RES_OK;
@@ -400,6 +456,18 @@ static lv_res_t lv_imgbtn_signal(lv_obj_t * imgbtn, lv_signal_t sign, void * par
          * changed as well Set the new image for the new state.*/
         refr_img(imgbtn);
     }
+    else if(sign == LV_SIGNAL_REFR_EXT_DRAW_PAD) {
+        /*Handle the padding of the background*/
+        lv_style_int_t left = lv_obj_get_style_pad_left(imgbtn, LV_IMGBTN_PART_MAIN);
+        lv_style_int_t right = lv_obj_get_style_pad_right(imgbtn, LV_IMGBTN_PART_MAIN);
+        lv_style_int_t top = lv_obj_get_style_pad_top(imgbtn, LV_IMGBTN_PART_MAIN);
+        lv_style_int_t bottom = lv_obj_get_style_pad_bottom(imgbtn, LV_IMGBTN_PART_MAIN);
+
+        imgbtn->ext_draw_pad = LV_MATH_MAX(imgbtn->ext_draw_pad, left);
+        imgbtn->ext_draw_pad = LV_MATH_MAX(imgbtn->ext_draw_pad, right);
+        imgbtn->ext_draw_pad = LV_MATH_MAX(imgbtn->ext_draw_pad, top);
+        imgbtn->ext_draw_pad = LV_MATH_MAX(imgbtn->ext_draw_pad, bottom);
+    }
     else if(sign == LV_SIGNAL_CLEANUP) {
         /*Nothing to cleanup. (No dynamically allocated memory in 'ext')*/
     }

src/lv_widgets/lv_label.c

@@ -161,7 +161,7 @@ lv_obj_t * lv_label_create(lv_obj_t * par, const lv_obj_t * copy)
         ext->dot_end       = copy_ext->dot_end;
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(new_label, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(new_label, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("label created");

src/lv_widgets/lv_led.c

@@ -88,7 +88,7 @@ lv_obj_t * lv_led_create(lv_obj_t * par, const lv_obj_t * copy)
         ext->bright             = copy_ext->bright;
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(led, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(led, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("led created");

src/lv_widgets/lv_line.c

@@ -95,7 +95,7 @@ lv_obj_t * lv_line_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_line_set_points(line, copy_ext->point_array, copy_ext->point_num);
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(line, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(line, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("line created");

src/lv_widgets/lv_linemeter.c

@@ -96,7 +96,7 @@ lv_obj_t * lv_linemeter_create(lv_obj_t * par, const lv_obj_t * copy)
         ext->cur_value             = copy_ext->cur_value;
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(linemeter, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(linemeter, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("line meter created");
@@ -392,15 +392,15 @@ void lv_linemeter_draw_scale(lv_obj_t * lmeter, const lv_area_t * clip_area, uin
     lv_coord_t x_ofs  = lmeter->coords.x1 + r_out + left;
     lv_coord_t y_ofs  = lmeter->coords.y1 + r_out + top;
     int16_t angle_ofs = ext->angle_ofs + 90 + (360 - ext->scale_angle) / 2;
-    int16_t level =
-        (int32_t)((int32_t)(ext->cur_value - ext->min_value) * (ext->line_cnt - 1)) / (ext->max_value - ext->min_value);
+    int16_t level = ext->mirrored ?
+                    (int32_t)((int32_t)(ext->max_value - ext->cur_value) * (ext->line_cnt - 1)) / (ext->max_value - ext->min_value) :
+                    (int32_t)((int32_t)(ext->cur_value - ext->min_value) * (ext->line_cnt - 1)) / (ext->max_value - ext->min_value);
     uint8_t i;
 
     lv_color_t main_color = lv_obj_get_style_line_color(lmeter, part);
     lv_color_t grad_color = lv_obj_get_style_scale_grad_color(lmeter, part);
     lv_color_t end_color = lv_obj_get_style_scale_end_color(lmeter, part);
 
-
     lv_draw_line_dsc_t line_dsc;
     lv_draw_line_dsc_init(&line_dsc);
     lv_obj_init_draw_line_dsc(lmeter, part, &line_dsc);
@@ -520,7 +520,7 @@ void lv_linemeter_draw_scale(lv_obj_t * lmeter, const lv_area_t * clip_area, uin
         p1.y = y_out_extra;
 
         /* Set the color of the lines */
-        if(i > level) {
+        if((!ext->mirrored && i >= level) || (ext->mirrored && i <= level)) {
             line_dsc.color = end_color;
             line_dsc.width = end_line_width;
         }

src/lv_widgets/lv_list.c

@@ -115,7 +115,7 @@ lv_obj_t * lv_list_create(lv_obj_t * par, const lv_obj_t * copy)
         }
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(list, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(list, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("list created");
@@ -365,11 +365,11 @@ lv_obj_t * lv_list_get_btn_label(const lv_obj_t * btn)
 {
     LV_ASSERT_OBJ(btn, "lv_btn");
 
-    lv_obj_t * label = lv_obj_get_child(btn, NULL);
+    lv_obj_t * label = lv_obj_get_child_back(btn, NULL);
     if(label == NULL) return NULL;
 
     while(lv_list_is_list_label(label) == false) {
-        label = lv_obj_get_child(btn, label);
+        label = lv_obj_get_child_back(btn, label);
         if(label == NULL) break;
     }
 
@@ -386,11 +386,11 @@ lv_obj_t * lv_list_get_btn_img(const lv_obj_t * btn)
     LV_ASSERT_OBJ(btn, "lv_btn");
 
 #if LV_USE_IMG != 0
-    lv_obj_t * img = lv_obj_get_child(btn, NULL);
+    lv_obj_t * img = lv_obj_get_child_back(btn, NULL);
     if(img == NULL) return NULL;
 
     while(lv_list_is_list_img(img) == false) {
-        img = lv_obj_get_child(btn, img);
+        img = lv_obj_get_child_back(btn, img);
         if(img == NULL) break;
     }
 
@@ -495,7 +495,7 @@ uint16_t lv_list_get_size(const lv_obj_t * list)
     lv_obj_t * btn = lv_list_get_next_btn(list, NULL);
     while(btn) {
         size++;
-        btn = lv_list_get_next_btn(list, NULL);
+        btn = lv_list_get_next_btn(list, btn);
     }
     return size;
 }

src/lv_widgets/lv_msgbox.c

@@ -127,7 +127,7 @@ lv_obj_t * lv_msgbox_create(lv_obj_t * par, const lv_obj_t * copy)
         if(copy_ext->btnm) ext->btnm = lv_btnmatrix_create(mbox, copy_ext->btnm);
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(mbox, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(mbox, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("message box created");

src/lv_widgets/lv_objmask.c

@@ -86,7 +86,7 @@ lv_obj_t * lv_objmask_create(lv_obj_t * par, const lv_obj_t * copy)
         /* lv_objmask_ext_t * copy_ext = lv_obj_get_ext_attr(copy); */
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(objmask, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(objmask, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("object mask created");

src/lv_widgets/lv_page.c

@@ -495,14 +495,14 @@ void lv_page_focus(lv_obj_t * page, const lv_obj_t * obj, lv_anim_enable_t anim_
     lv_coord_t scrlable_y = lv_obj_get_y(ext->scrl);
     lv_coord_t page_h     = lv_obj_get_height(page);
 
-    lv_coord_t top_err = -(scrlable_y + obj_y);
-    lv_coord_t bot_err = scrlable_y + obj_y + obj_h - page_h;
-
     lv_style_int_t bg_top = lv_obj_get_style_pad_top(page, LV_PAGE_PART_BG);
     lv_style_int_t bg_bottom = lv_obj_get_style_pad_bottom(page, LV_PAGE_PART_BG);
     lv_style_int_t scrl_top = lv_obj_get_style_pad_top(ext->scrl, LV_CONT_PART_MAIN);
     lv_style_int_t scrl_bottom = lv_obj_get_style_pad_bottom(ext->scrl, LV_CONT_PART_MAIN);
 
+    lv_coord_t top_err = -((scrlable_y + obj_y) - bg_top);
+    lv_coord_t bot_err = scrlable_y + obj_y + obj_h - (page_h - bg_bottom);
+
     /*Out of the page on the top*/
     if((obj_h <= page_h && top_err > 0) || (obj_h > page_h && top_err < bot_err)) {
         /*Calculate a new position and let some space above*/
@@ -524,14 +524,14 @@ void lv_page_focus(lv_obj_t * page, const lv_obj_t * obj, lv_anim_enable_t anim_
     lv_coord_t scrlable_x = lv_obj_get_x(ext->scrl);
     lv_coord_t page_w     = lv_obj_get_width(page);
 
-    lv_coord_t left_err  = -(scrlable_x + obj_x);
-    lv_coord_t right_err = scrlable_x + obj_x + obj_w - page_w;
-
     lv_style_int_t bg_left = lv_obj_get_style_pad_left(page, LV_PAGE_PART_BG);
     lv_style_int_t bg_right = lv_obj_get_style_pad_right(page, LV_PAGE_PART_BG);
     lv_style_int_t scrl_left = lv_obj_get_style_pad_top(ext->scrl, LV_CONT_PART_MAIN);
     lv_style_int_t scrl_right = lv_obj_get_style_pad_bottom(ext->scrl, LV_CONT_PART_MAIN);
 
+    lv_coord_t left_err  = -((scrlable_x + obj_x) - bg_left);
+    lv_coord_t right_err = scrlable_x + obj_x + obj_w - (page_w - bg_right);
+
     /*Out of the page on the left*/
     if((obj_w <= page_w && left_err > 0) || (obj_w > page_w && left_err < right_err)) {
         /*Calculate a new position and let some space on the side*/

src/lv_widgets/lv_page.h

@@ -41,7 +41,7 @@ enum {
     LV_SCROLLBAR_MODE_DRAG   = 0x2, /**< Show scroll bars when page is being dragged*/
     LV_SCROLLBAR_MODE_AUTO   = 0x3, /**< Show scroll bars when the scrollable container is large enough to be scrolled*/
     LV_SCROLLBAR_MODE_HIDE   = 0x4, /**< Hide the scroll bar temporally*/
-    LV_SCROLLBAR_MODE_UNHIDE = 0x5, /**< Unhide the previously hidden scroll bar. Recover original mode too*/
+    LV_SCROLLBAR_MODE_UNHIDE = 0x8, /**< Unhide the previously hidden scroll bar. Recover original mode too*/
 };
 typedef uint8_t lv_scrollbar_mode_t;
 

src/lv_widgets/lv_roller.c

@@ -135,7 +135,7 @@ lv_obj_t * lv_roller_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_obj_set_signal_cb(scrl, lv_roller_scrl_signal);
 
         lv_style_list_copy(&ext->style_sel, &copy_ext->style_sel);
-        lv_obj_refresh_style(roller, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(roller, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("roller created");
@@ -585,10 +585,8 @@ static lv_res_t lv_roller_signal(lv_obj_t * roller, lv_signal_t sign, void * par
 
     /* Include the ancient signal function */
     if(sign != LV_SIGNAL_CONTROL) { /*Don't let the page to scroll on keys*/
-#if LV_USE_GROUP
         res = ancestor_signal(roller, sign, param);
         if(res != LV_RES_OK) return res;
-#endif
     }
 
     if(sign == LV_SIGNAL_GET_TYPE) return lv_obj_handle_get_type_signal(param, LV_OBJX_NAME);
@@ -966,6 +964,18 @@ static void refr_width(lv_obj_t * roller)
     lv_style_int_t left = lv_obj_get_style_pad_left(roller, LV_ROLLER_PART_BG);
     lv_style_int_t right = lv_obj_get_style_pad_right(roller, LV_ROLLER_PART_BG);
 
+    const lv_font_t * base_font = lv_obj_get_style_text_font(roller, LV_ROLLER_PART_BG);
+    const lv_font_t * sel_font = lv_obj_get_style_text_font(roller, LV_ROLLER_PART_SELECTED);
+
+    /*The selected text might be larger to get its size*/
+    if(base_font != sel_font) {
+        lv_coord_t letter_sp = lv_obj_get_style_text_letter_space(roller, LV_ROLLER_PART_SELECTED);
+        lv_coord_t line_sp = lv_obj_get_style_text_line_space(roller, LV_ROLLER_PART_SELECTED);
+        lv_point_t p;
+        _lv_txt_get_size(&p, lv_label_get_text(label), sel_font, letter_sp, line_sp, LV_COORD_MAX, LV_TXT_FLAG_NONE);
+        if(label_w < p.x)label_w = p.x;
+    }
+
     lv_obj_set_width(roller, label_w + left + right);
 }
 

src/lv_widgets/lv_slider.c

@@ -103,7 +103,7 @@ lv_obj_t * lv_slider_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_area_copy(&ext->left_knob_area, &copy_ext->left_knob_area);
         lv_area_copy(&ext->right_knob_area, &copy_ext->right_knob_area);
 
-        lv_obj_refresh_style(slider, LV_OBJ_PART_ALL);
+        lv_obj_refresh_style(slider, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("slider created");

src/lv_widgets/lv_spinbox.c

@@ -106,7 +106,7 @@ lv_obj_t * lv_spinbox_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_spinbox_set_rollover(spinbox, copy_ext->rollover);
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(spinbox, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(spinbox, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     lv_spinbox_updatevalue(spinbox);
@@ -390,10 +390,8 @@ static lv_res_t lv_spinbox_signal(lv_obj_t * spinbox, lv_signal_t sign, void * p
 
     /* Include the ancient signal function */
     if(sign != LV_SIGNAL_CONTROL) {
-#if LV_USE_GROUP
         res = ancestor_signal(spinbox, sign, param);
         if(res != LV_RES_OK) return res;
-#endif
     }
     if(sign == LV_SIGNAL_GET_TYPE) return lv_obj_handle_get_type_signal(param, LV_OBJX_NAME);
 

src/lv_widgets/lv_spinner.c

@@ -106,7 +106,7 @@ lv_obj_t * lv_spinner_create(lv_obj_t * par, const lv_obj_t * copy)
         ext->time                   = copy_ext->time;
         ext->anim_dir               = copy_ext->anim_dir;
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(spinner, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(spinner, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     lv_spinner_set_type(spinner, ext->anim_type);

src/lv_widgets/lv_switch.c

@@ -100,7 +100,7 @@ lv_obj_t * lv_switch_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_switch_ext_t * copy_ext = lv_obj_get_ext_attr(copy);
 
         lv_style_list_copy(&ext->style_knob, &copy_ext->style_knob);
-        lv_obj_refresh_style(sw, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(sw, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     /*Refresh the style with new signal function*/

src/lv_widgets/lv_table.c

@@ -105,12 +105,12 @@ lv_obj_t * lv_table_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_table_ext_t * copy_ext = lv_obj_get_ext_attr(copy);
         for(i = 0; i < LV_TABLE_CELL_STYLE_CNT; i++) {
             lv_style_list_copy(&ext->cell_style[i], &copy_ext->cell_style[i]);
-            lv_table_set_row_cnt(table, copy_ext->row_cnt);
-            lv_table_set_col_cnt(table, copy_ext->col_cnt);
         }
+        lv_table_set_row_cnt(table, copy_ext->row_cnt);
+        lv_table_set_col_cnt(table, copy_ext->col_cnt);
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(table, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(table, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("table created");
@@ -192,6 +192,16 @@ void lv_table_set_row_cnt(lv_obj_t * table, uint16_t row_cnt)
     uint16_t old_row_cnt = ext->row_cnt;
     ext->row_cnt         = row_cnt;
 
+    if(ext->row_cnt > 0) {
+        ext->row_h = lv_mem_realloc(ext->row_h, ext->row_cnt * sizeof(ext->row_h[0]));
+        LV_ASSERT_MEM(ext->row_h);
+        if(ext->row_h == NULL) return;
+    }
+    else {
+        lv_mem_free(ext->row_h);
+        ext->row_h = NULL;
+    }
+
     if(ext->row_cnt > 0 && ext->col_cnt > 0) {
         ext->cell_data = lv_mem_realloc(ext->cell_data, ext->row_cnt * ext->col_cnt * sizeof(char *));
         LV_ASSERT_MEM(ext->cell_data);
@@ -203,10 +213,6 @@ void lv_table_set_row_cnt(lv_obj_t * table, uint16_t row_cnt)
             uint32_t new_cell_cnt = ext->col_cnt * ext->row_cnt;
             _lv_memset_00(&ext->cell_data[old_cell_cnt], (new_cell_cnt - old_cell_cnt) * sizeof(ext->cell_data[0]));
         }
-
-        ext->row_h = lv_mem_realloc(ext->row_h, ext->row_cnt * sizeof(ext->row_h[0]));
-        LV_ASSERT_MEM(ext->cell_data);
-        if(ext->cell_data == NULL) return;
     }
     else {
         lv_mem_free(ext->cell_data);
@@ -968,10 +974,15 @@ static lv_style_list_t * lv_table_get_style(lv_obj_t * table, uint8_t part)
 
 static void refr_size(lv_obj_t * table)
 {
+
     lv_coord_t h = 0;
     lv_coord_t w = 0;
 
     lv_table_ext_t * ext = lv_obj_get_ext_attr(table);
+    if(ext->row_cnt == 0 || ext->col_cnt == 0) {
+        lv_obj_set_size(table, w, h);
+        return;
+    }
 
     uint16_t i;
     for(i = 0; i < ext->col_cnt; i++) {

src/lv_widgets/lv_tabview.c

@@ -180,11 +180,11 @@ lv_obj_t * lv_tabview_create(lv_obj_t * par, const lv_obj_t * copy)
                                                                                                               LV_PAGE_PART_SCROLLABLE));
             lv_style_list_copy(lv_obj_get_style_list(new_tab, LV_PAGE_PART_SCROLLBAR), lv_obj_get_style_list(copy_tab,
                                                                                                              LV_PAGE_PART_SCROLLBAR));
-            lv_obj_refresh_style(new_tab, LV_STYLE_PROP_ALL);
+            lv_obj_refresh_style(new_tab, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
         }
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(tabview, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(tabview, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     tabview_realign(tabview);
@@ -230,20 +230,6 @@ lv_obj_t * lv_tabview_add_tab(lv_obj_t * tabview, const char * name)
 
     ext->tab_cnt++;
 
-    switch(ext->btns_pos) {
-        case LV_TABVIEW_TAB_POS_TOP:
-        case LV_TABVIEW_TAB_POS_BOTTOM:
-            ext->tab_name_ptr = lv_mem_realloc((void *)ext->tab_name_ptr, sizeof(char *) * (ext->tab_cnt + 1));
-            break;
-        case LV_TABVIEW_TAB_POS_LEFT:
-        case LV_TABVIEW_TAB_POS_RIGHT:
-            ext->tab_name_ptr = lv_mem_realloc((void *)ext->tab_name_ptr, sizeof(char *) * (ext->tab_cnt * 2));
-            break;
-    }
-
-    LV_ASSERT_MEM(ext->tab_name_ptr);
-    if(ext->tab_name_ptr == NULL) return NULL;
-
     /* FIXME: It is not possible yet to switch tab button position from/to top/bottom from/to left/right at runtime.
      * Method: clean extra \n when switch from LV_TABVIEW_BTNS_POS_LEFT or LV_TABVIEW_BTNS_POS_RIGHT
      * to LV_TABVIEW_BTNS_POS_TOP or LV_TABVIEW_BTNS_POS_BOTTOM.
@@ -448,6 +434,35 @@ void lv_tabview_set_tab_act(lv_obj_t * tabview, uint16_t id, lv_anim_enable_t an
     lv_btnmatrix_set_btn_ctrl(ext->btns, ext->tab_cur, LV_BTNMATRIX_CTRL_CHECK_STATE);
 }
 
+/**
+ * Set the name of a tab.
+ * @param tabview pointer to Tab view object
+ * @param id index of the tab the name should be set
+ * @param name new tab name
+ */
+void lv_tabview_set_tab_name(lv_obj_t * tabview, uint16_t id, char * name)
+{
+    LV_ASSERT_OBJ(tabview, LV_OBJX_NAME);
+
+    /* get tabview's ext pointer which contains the tab name pointer list */
+    lv_tabview_ext_t * ext = lv_obj_get_ext_attr(tabview);
+
+    /* check for valid tab index */
+    if(ext->tab_cnt > id) {
+        /* reallocate memory for new tab name (use reallocate due to mostly the size didn't change much) */
+        char * str = lv_mem_realloc((void *)ext->tab_name_ptr[id], strlen(name) + 1);
+        LV_ASSERT_MEM(str);
+
+        /* store new tab name at allocated memory */
+        strcpy(str, name);
+        /* update pointer  */
+        ext->tab_name_ptr[id] = str;
+
+        /* force redrawing of the tab headers */
+        lv_obj_invalidate(ext->btns);
+    }
+}
+
 /**
  * Set the animation time of tab view when a new tab is loaded
  * @param tabview pointer to Tab view object
@@ -613,7 +628,7 @@ static lv_res_t lv_tabview_signal(lv_obj_t * tabview, lv_signal_t sign, void * p
     lv_tabview_ext_t * ext = lv_obj_get_ext_attr(tabview);
     if(sign == LV_SIGNAL_CLEANUP) {
         uint8_t i;
-        for(i = 0; ext->tab_name_ptr[i][0] != '\0'; i++) lv_mem_free(ext->tab_name_ptr[i]);
+        for(i = 0; ext->tab_name_ptr[i][0] != '\0' && ext->tab_name_ptr[i][0] != '\n'; i++) lv_mem_free(ext->tab_name_ptr[i]);
 
         lv_mem_free(ext->tab_name_ptr);
         ext->tab_name_ptr = NULL;

src/lv_widgets/lv_tabview.h

@@ -119,6 +119,14 @@ void lv_tabview_clean_tab(lv_obj_t * tab);
  */
 void lv_tabview_set_tab_act(lv_obj_t * tabview, uint16_t id, lv_anim_enable_t anim);
 
+/**
+ * Set the name of a tab.
+ * @param tabview pointer to Tab view object
+ * @param id index of the tab the name should be set
+ * @param name new tab name
+ */
+void lv_tabview_set_tab_name(lv_obj_t * tabview, uint16_t id, char * name);
+
 /**
  * Set the animation time of tab view when a new tab is loaded
  * @param tabview pointer to Tab view object

src/lv_widgets/lv_textarea.c

@@ -60,6 +60,7 @@ static void pwd_char_hider(lv_obj_t * ta);
 static bool char_is_accepted(lv_obj_t * ta, uint32_t c);
 static void refr_cursor_area(lv_obj_t * ta);
 static void update_cursor_position_on_click(lv_obj_t * ta, lv_signal_t sign, lv_indev_t * click_source);
+static lv_res_t insert_handler(lv_obj_t * ta, const char * txt);
 
 /**********************
  *  STATIC VARIABLES
@@ -148,7 +149,7 @@ lv_obj_t * lv_textarea_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_label_set_text(ext->label, "Text area");
         lv_obj_set_click(ext->label, false);
         lv_obj_set_size(ta, LV_TEXTAREA_DEF_WIDTH, LV_TEXTAREA_DEF_HEIGHT);
-        lv_textarea_set_sscrollbar_mode(ta, LV_SCROLLBAR_MODE_DRAG);
+        lv_textarea_set_scrollbar_mode(ta, LV_SCROLLBAR_MODE_DRAG);
 
         lv_obj_reset_style_list(ta, LV_PAGE_PART_SCROLLABLE);
         lv_theme_apply(ta, LV_THEME_TEXTAREA);
@@ -187,7 +188,7 @@ lv_obj_t * lv_textarea_create(lv_obj_t * par, const lv_obj_t * copy)
         if(copy_ext->one_line) lv_textarea_set_one_line(ta, true);
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(ta, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(ta, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
 #if LV_USE_ANIMATION
@@ -243,17 +244,8 @@ void lv_textarea_add_char(lv_obj_t * ta, uint32_t c)
     if(c != 0) while(*letter_buf == 0) ++letter_buf;
 #endif
 
-    ta_insert_replace = NULL;
-    lv_event_send(ta, LV_EVENT_INSERT, letter_buf);
-    if(ta_insert_replace) {
-        if(ta_insert_replace[0] == '\0') return; /*Drop this text*/
-
-        /*Add the replaced text directly it's different from the original*/
-        if(strcmp(ta_insert_replace, letter_buf)) {
-            lv_textarea_add_text(ta, ta_insert_replace);
-            return;
-        }
-    }
+    lv_res_t res = insert_handler(ta, letter_buf);
+    if(res != LV_RES_OK) return;
 
     if(ext->one_line && (c == '\n' || c == '\r')) {
         LV_LOG_INFO("Text area: line break ignored in one-line mode");
@@ -268,6 +260,7 @@ void lv_textarea_add_char(lv_obj_t * ta, uint32_t c)
         return;
     }
 
+
     /*If a new line was added it shouldn't show edge flash effect*/
     bool edge_flash_en = lv_textarea_get_edge_flash(ta);
     lv_textarea_set_edge_flash(ta, false);
@@ -333,18 +326,6 @@ void lv_textarea_add_text(lv_obj_t * ta, const char * txt)
 
     lv_textarea_ext_t * ext = lv_obj_get_ext_attr(ta);
 
-    ta_insert_replace = NULL;
-    lv_event_send(ta, LV_EVENT_INSERT, txt);
-    if(ta_insert_replace) {
-        if(ta_insert_replace[0] == '\0') return; /*Drop this text*/
-
-        /*Add the replaced text directly it's different from the original*/
-        if(strcmp(ta_insert_replace, txt)) {
-            lv_textarea_add_text(ta, ta_insert_replace);
-            return;
-        }
-    }
-
     if(ext->pwd_mode != 0) pwd_char_hider(ta); /*Make sure all the current text contains only '*'*/
 
     /*Add the character one-by-one if not all characters are accepted or there is character limit.*/
@@ -357,6 +338,9 @@ void lv_textarea_add_text(lv_obj_t * ta, const char * txt)
         return;
     }
 
+    lv_res_t res = insert_handler(ta, txt);
+    if(res != LV_RES_OK) return;
+
     /*If a new line was added it shouldn't show edge flash effect*/
     bool edge_flash_en = lv_textarea_get_edge_flash(ta);
     lv_textarea_set_edge_flash(ta, false);
@@ -419,18 +403,10 @@ void lv_textarea_del_char(lv_obj_t * ta)
 
     if(cur_pos == 0) return;
 
-    ta_insert_replace = NULL;
     char del_buf[2]   = {LV_KEY_DEL, '\0'};
-    lv_event_send(ta, LV_EVENT_INSERT, del_buf);
-    if(ta_insert_replace) {
-        if(ta_insert_replace[0] == '\0') return; /*Drop this text*/
 
-        /*Add the replaced text directly it's different from the original*/
-        if(strcmp(ta_insert_replace, del_buf)) {
-            lv_textarea_add_text(ta, ta_insert_replace);
-            return;
-        }
-    }
+    lv_res_t res = insert_handler(ta, del_buf);
+    if(res != LV_RES_OK) return;
 
     char * label_txt = lv_label_get_text(ext->label);
 
@@ -1915,4 +1891,21 @@ static void update_cursor_position_on_click(lv_obj_t * ta, lv_signal_t sign, lv_
 #endif
 }
 
+static lv_res_t insert_handler(lv_obj_t * ta, const char * txt)
+{
+    ta_insert_replace = NULL;
+    lv_event_send(ta, LV_EVENT_INSERT, txt);
+    if(ta_insert_replace) {
+        if(ta_insert_replace[0] == '\0') return LV_RES_INV; /*Drop this text*/
+
+        /*Add the replaced text directly it's different from the original*/
+        if(strcmp(ta_insert_replace, txt)) {
+            lv_textarea_add_text(ta, ta_insert_replace);
+            return LV_RES_INV;
+        }
+    }
+
+    return LV_RES_OK;
+}
+
 #endif

src/lv_widgets/lv_textarea.h

@@ -224,7 +224,7 @@ void lv_textarea_set_insert_replace(lv_obj_t * ta, const char * txt);
  * @param ta pointer to a text area object
  * @param sb_mode the new mode from 'lv_scrollbar_mode_t' enum
  */
-static inline void lv_textarea_set_sscrollbar_mode(lv_obj_t * ta, lv_scrollbar_mode_t mode)
+static inline void lv_textarea_set_scrollbar_mode(lv_obj_t * ta, lv_scrollbar_mode_t mode)
 {
     lv_page_set_scrollbar_mode(ta, mode);
 }

src/lv_widgets/lv_tileview.c

@@ -133,7 +133,7 @@ lv_obj_t * lv_tileview_create(lv_obj_t * par, const lv_obj_t * copy)
 #endif
 
         /*Refresh the style with new signal function*/
-        lv_obj_refresh_style(new_tileview, LV_STYLE_PROP_ALL);
+        lv_obj_refresh_style(new_tileview, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
     }
 
     LV_LOG_INFO("tileview created");

src/lv_widgets/lv_win.c

@@ -156,7 +156,7 @@ lv_obj_t * lv_win_create(lv_obj_t * par, const lv_obj_t * copy)
     }
 
     /*Refresh the style with new signal function*/
-    lv_obj_refresh_style(new_win, LV_STYLE_PROP_ALL);
+    lv_obj_refresh_style(new_win, LV_OBJ_PART_ALL, LV_STYLE_PROP_ALL);
 
     lv_win_realign(new_win);
 

tests/Makefile

@@ -30,6 +30,11 @@ CSRCS += lv_test_assert.c
 CSRCS += lv_test_core/lv_test_core.c
 CSRCS += lv_test_core/lv_test_obj.c
 CSRCS += lv_test_core/lv_test_style.c
+CSRCS += lv_test_core/lv_test_font_loader.c
+CSRCS += lv_test_widgets/lv_test_label.c
+CSRCS += lv_test_fonts/font_1.c
+CSRCS += lv_test_fonts/font_2.c
+CSRCS += lv_test_fonts/font_3.c
 
 OBJEXT ?= .o