release v8.3.11

Co-authored-by: Rbb666 <64397326+Rbb666@users.noreply.github.com>

Kconfig

@@ -964,6 +964,17 @@ menu "LVGL configuration"
             default 0
             depends on LV_USE_FS_FATFS
 
+        config LV_USE_FS_LITTLEFS
+            bool "File system on top of LittleFS"
+        config LV_FS_LITTLEFS_LETTER
+            int "Set an upper cased letter on which the drive will accessible (e.g. 'A' i.e. 65)"
+            default 0
+            depends on LV_USE_FS_LITTLEFS
+        config LV_FS_LITTLEFS_CACHE_SIZE
+            int ">0 to cache this number of bytes in lv_fs_read()"
+            default 0
+            depends on LV_USE_FS_LITTLEFS
+
         config LV_USE_PNG
             bool "PNG decoder library"
 
@@ -1000,6 +1011,13 @@ menu "LVGL configuration"
             endmenu
         endif
 
+        config LV_USE_TINY_TTF
+            bool "Tiny TTF library"
+        config LV_TINY_TTF_FILE_SUPPORT
+            bool "Load TTF data from files"
+            depends on LV_USE_TINY_TTF
+            default n
+
         config LV_USE_RLOTTIE
             bool "Lottie library"
 

demos/music/lv_demo_music_main.c

@@ -769,7 +769,7 @@ static void spectrum_draw_event_cb(lv_event_t * e)
         lv_obj_t * obj = lv_event_get_target(e);
         lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
 
-        lv_opa_t opa = lv_obj_get_style_opa(obj, LV_PART_MAIN);
+        lv_opa_t opa = lv_obj_get_style_opa_recursive(obj, LV_PART_MAIN);
         if(opa < LV_OPA_MIN) return;
 
         lv_point_t poly[4];

demos/stress/lv_demo_stress.c

@@ -35,6 +35,8 @@ static lv_obj_t * ta;
 static const char * mbox_btns[] = {"Ok", "Cancel", ""};
 static uint32_t mem_free_start = 0;
 static lv_timer_t * obj_test_timer;
+static int16_t state;
+static lv_timer_t * msgbox_tmr;
 
 /**********************
  *      MACROS
@@ -48,11 +50,18 @@ void lv_demo_stress(void)
 {
     LV_LOG_USER("Starting stress test. (< 100 bytes permanent memory leak is normal due to fragmentation)");
     obj_test_timer = lv_timer_create(obj_test_timer_cb, LV_DEMO_STRESS_TIME_STEP, NULL);
+    state = -1;
 }
 
 void lv_demo_stress_close(void)
 {
     lv_timer_del(obj_test_timer);
+    obj_test_timer = NULL;
+    if(msgbox_tmr) {
+        lv_timer_del(msgbox_tmr);
+        msgbox_tmr = NULL;
+    }
+
     lv_obj_clean(lv_scr_act());
     lv_obj_clean(lv_layer_top());
 }
@@ -64,13 +73,10 @@ void lv_demo_stress_close(void)
 static void obj_test_timer_cb(lv_timer_t * tmr)
 {
     (void) tmr;    /*Unused*/
-    static int16_t state = -1;
 
     lv_anim_t a;
     lv_obj_t * obj;
 
-    //    printf("step start: %d\n", state);
-
     switch(state) {
         case -1: {
                 lv_res_t res = lv_mem_test();
@@ -255,8 +261,7 @@ static void obj_test_timer_cb(lv_timer_t * tmr)
 
         case 14:
             obj = lv_msgbox_create(NULL, "Title", "Some text on the message box with average length", mbox_btns, true);
-
-            lv_timer_t * msgbox_tmr = lv_timer_create(msgbox_del, LV_DEMO_STRESS_TIME_STEP * 5 + 30, obj);
+            msgbox_tmr = lv_timer_create(msgbox_del, LV_DEMO_STRESS_TIME_STEP * 5 + 30, obj);
             lv_timer_set_repeat_count(msgbox_tmr, 1);
             lv_obj_align(obj, LV_ALIGN_RIGHT_MID, -10, 0);
             break;
@@ -448,6 +453,7 @@ static void auto_del(lv_obj_t * obj, uint32_t delay)
 
 static void msgbox_del(lv_timer_t * tmr)
 {
+    msgbox_tmr = NULL;
     lv_msgbox_close(tmr->user_data);
 }
 

docs/CHANGELOG.md

@@ -1,5 +1,86 @@
 # Changelog
 
+## [v8.3.11](https://github.com/lvgl/lvgl/compare/v8.3.11...v8.3.10) 6 December 2023
+
+### New Features
+
+- feat(table): add user_data to table cells [`4767`](https://github.com/lvgl/lvgl/pull/4767)
+- feat(tiny_ttf): backport Tiny TTF to lvgl 8 [`4727`](https://github.com/lvgl/lvgl/pull/4727)
+- feat(littlefs): add lv_fs_littlefs system as a driver [`4677`](https://github.com/lvgl/lvgl/pull/4677)
+
+### Fixes
+
+- fix(obj): readjust scroll after layout when child removed [`4921`](https://github.com/lvgl/lvgl/pull/4921)
+- fix(rt-thread): fix create lvgl thread problem [`4862`](https://github.com/lvgl/lvgl/pull/4862)
+- fix(obj): fix arduino compile warnings [`4807`](https://github.com/lvgl/lvgl/pull/4807)
+- fix(table):fix issue with abnormal string output of 'lv_table_set_cell_value_fmt' [`4804`](https://github.com/lvgl/lvgl/pull/4804)
+- fix(table) user data API functions renamed [`4769`](https://github.com/lvgl/lvgl/pull/4769)
+- fix(ime_pinyin): keep cursor in the textarea when a candidate is pressed [`4731`](https://github.com/lvgl/lvgl/pull/4731)
+- fix(draw_needles): changed needle line draw start point from scale ce… [`4682`](https://github.com/lvgl/lvgl/pull/4682)
+- fix(arc): handle click outside background angle range (#4586) [`4667`](https://github.com/lvgl/lvgl/pull/4667)
+- fix(meter):  fix minor issues [`4657`](https://github.com/lvgl/lvgl/pull/4657)
+- fix(draw): fix compiler error in lv_draw_sw_transform.c #2 [`4612`](https://github.com/lvgl/lvgl/pull/4612)
+- fix(dropdown): avoid partial match in lv_dropdown_get_option_index [`4598`](https://github.com/lvgl/lvgl/pull/4598)
+- fix(dropdown): reset char_i = 0, avoid access overflow [`4589`](https://github.com/lvgl/lvgl/pull/4589)
+- fix(btnmatrix): set LV_BTNMATRIX_BTN_NONE when clicking of disabled button (#4571) [`4578`](https://github.com/lvgl/lvgl/pull/4578)
+- fix(qrcode): use LV_ASSERT instead of assert [`1840dec`](https://github.com/lvgl/lvgl/commit/1840decb4136ba01552fcb7cedb0ff759824e2fd)
+- fix: fix warning in lv_draw_sw_letter.c [`d22cda3`](https://github.com/lvgl/lvgl/commit/d22cda3cdb15cee95763491db95753980846d9f9)
+- fix(arc): fix setting value by click [`20b6199`](https://github.com/lvgl/lvgl/commit/20b6199ba90319942c3cd91f2c727da6cd40cd2d)
+- fix(disp): fix infinite recursive SCREEN_LOADED events [`ef76206`](https://github.com/lvgl/lvgl/commit/ef76206c75ea9de26407534a9ce1079dc8e750e3)
+- fix(keyboard): add '&' character [`d20bd1c`](https://github.com/lvgl/lvgl/commit/d20bd1ca397ff954167dd496cf1a78da8814f602)
+- fix(draw): fix scaling rectangle parts with opa [`7a8fcbf`](https://github.com/lvgl/lvgl/commit/7a8fcbfd3458739cbe64b29767a969ece9542039)
+
+### Docs
+
+- docs(obj): fix wording [`4625`](https://github.com/lvgl/lvgl/pull/4625)
+- docs(label): update text for recoloring [`4606`](https://github.com/lvgl/lvgl/pull/4606)
+- docs: fix typo [`9fbac75`](https://github.com/lvgl/lvgl/commit/9fbac7570bdec18ddbb157b59f5e26a2ebdf5daf)
+
+### Others
+
+- chore(cmsis-pack): prepare for v8.3.11 [`4936`](https://github.com/lvgl/lvgl/pull/4936)
+- chore(cmake): add support for user-specified lv_conf.h path [`4689`](https://github.com/lvgl/lvgl/pull/4689)
+- STM32U5 DMA2D support (8.3) [`4643`](https://github.com/lvgl/lvgl/pull/4643)
+- backport: fix(lv_disp): fix lv_scr_load_anim being called twice quickly [`4629`](https://github.com/lvgl/lvgl/pull/4629)
+- chore(lv_draw_sw_letter.c): Fix print format [`4615`](https://github.com/lvgl/lvgl/pull/4615)
+- chore: fix compile error [`7568df7`](https://github.com/lvgl/lvgl/commit/7568df77d16ecbf2242b2bc290dc8fc0eb29cf5a)
+
+## [v8.3.10](https://github.com/lvgl/lvgl/compare/v8.3.10...v8.3.9) 20 September 2023
+
+### New Features
+
+- feat(disp): add double buffered direct-mode efficient sync algorithm (v8.3) [`4497`](https://github.com/lvgl/lvgl/pull/4497)
+- feat(style): backport opa_layered [`6548ea0`](https://github.com/lvgl/lvgl/commit/6548ea0f291be8a97afb3c4d7dcabbe465ae5a04)
+
+
+### Fixes
+
+- fix: build on Windows (MinGW environment) [`4538`](https://github.com/lvgl/lvgl/pull/4538)
+- fix(docs): dropdown: fix function name in description of static options [`4535`](https://github.com/lvgl/lvgl/pull/4535)
+- fix: do not copy invalid areas if not double buffered mode [`4526`](https://github.com/lvgl/lvgl/pull/4526)
+- fix(sdl): add missing parameter in lv_draw_sdl_composite_texture_obtain [`4490`](https://github.com/lvgl/lvgl/pull/4490)
+- fix(dropdown): position to the selected item in lv_dropdown_set_selected [`f174589`](https://github.com/lvgl/lvgl/commit/f174589240b099a349e54ba09aa9b39c2b347341)
+- fix(vglite): be sure end_angle > start_angle in arc drawing [`01cd1fe`](https://github.com/lvgl/lvgl/commit/01cd1fed9db974aa616a6289a29171b7a971cd89)
+- fix(btnmatrix): fix tapping just outside a button in a buttonmatrix [`8063fac`](https://github.com/lvgl/lvgl/commit/8063fac793b0a09add1e57c1115b734659274e6f)
+
+
+### Docs
+
+- docs(calendar): update according to v8.2 changes [`a296456`](https://github.com/lvgl/lvgl/commit/a296456591f6ff0e3b3ae6cdcdd9ec5b1711c357)
+- docs(simulator): remove SDL support from the Visual Studio project [`bcebafe`](https://github.com/lvgl/lvgl/commit/bcebafe4fb72e336b7dedca89c07e334427eef8d)
+
+### CI and tests
+
+- ci: update screenshot compare from v9 to automatically create missing reference images [`fd21ed0`](https://github.com/lvgl/lvgl/commit/fd21ed0eb82bacb1e482180ab0aaed6a667f000d)
+- ci(dropdown): fix test [`5fc488a`](https://github.com/lvgl/lvgl/commit/5fc488a088639dbfb5eb44f65b05e13b6ba881bf)
+
+### Others
+
+- chore(cmsis-pack): create cmsis-pack for v8.3.10 [`4572`](https://github.com/lvgl/lvgl/pull/4572)
+- Update screen object opacity function documentation [`4505`](https://github.com/lvgl/lvgl/pull/4505)
+- demo(sress): fix issues when the stress test is opened/clsoed multiple times [`1c5df6c`](https://github.com/lvgl/lvgl/commit/1c5df6c665b0d5f6f346d45b13109ff1f6ea78a6)
+- chore: code formatting [`eb87767`](https://github.com/lvgl/lvgl/commit/eb87767cc65fec93f9cc4f87a1f8fb5b32f7e41d)
+
 
 ## [v8.3.9](https://github.com/lvgl/lvgl/compare/v8.3.9...v8.3.8) 6 August 2023
 

docs/get-started/platforms/pc-simulator.md

@@ -15,7 +15,7 @@ The simulator is ported to various IDEs (Integrated Development Environments). C
 
 - [Eclipse with SDL driver](https://github.com/lvgl/lv_sim_eclipse_sdl): Recommended on Linux and Mac
 - [CodeBlocks](https://github.com/lvgl/lv_sim_codeblocks_win): Recommended on Windows
-- [VisualStudio with SDL driver](https://github.com/lvgl/lv_sim_visual_studio_sdl): For Windows
+- [VisualStudio](https://github.com/lvgl/lv_sim_visual_studio_sdl): For Windows
 - [VSCode with SDL driver](https://github.com/lvgl/lv_sim_vscode_sdl): Recommended on Linux and Mac
 - [PlatformIO with SDL driver](https://github.com/lvgl/lv_platformio): Recommended on Linux and Mac
 - [MDK with FastModel](https://github.com/lvgl/lv_port_an547_cm55_sim): For Windows

docs/libs/fsdrv.md

@@ -2,14 +2,38 @@
 # File System Interfaces
 
 LVGL has a [File system](https://docs.lvgl.io/master/overview/file-system.html) module to provide an abstraction layer for various file system drivers.
+You still need to provide the drivers and libraries, this extension provides only the bridge between FATFS, LittleFS, STDIO, POSIX, WIN32 and LVGL.
 
-LVG has built in support for:
-- [FATFS](http://elm-chan.org/fsw/ff/00index_e.html)
-- STDIO (Linux and Windows using C standard function .e.g fopen, fread)
-- POSIX (Linux and Windows using POSIX function .e.g open, read)
-- WIN32 (Windows using Win32 API function .e.g CreateFileA, ReadFile)
+## Built in wrappers
 
-You still need to provide the drivers and libraries, this extension provides only the bridge between FATFS, STDIO, POSIX, WIN32 and LVGL.
+### FATFS
+
+Bridge for [FatFS](http://elm-chan.org/fsw/ff/00index_e.html). FatFS itself is not part of LVGL, but can be added and initialized externally.
+
+
+### LittleFS
+
+Though `lv_fs_littlefs` uses [LittleFS]((https://github.com/littlefs-project/littlefs)) API, the LittleFS library needs other external libraries that handle the mounting of partitions and low-level accesses, according to the given architecture. The functions for the latter are given to the lfs_t structure as pointers by an external low-level library.
+
+There's a convenience function called `lv_fs_littlefs_set_driver(LV_FS_LITTLEFS_LETTER, my_lfs)`, specific to `lv_fs_littlefs`, to attach a `lfs_t` object's pointer to a registered driver-letter. See its comments for more info.
+
+
+[esp_littlefs](https://components.espressif.com/components/joltwallet/littlefs) is a wrapper for LittleFS to be used in Espressif ESP-devices. It handles the mounting and has the low-level `littlefs_api` functions to read/write/erase blocks that LittleFS library needs. On mounting by `esp_littlefs` the `lfs_t` structures are created. You need to get a handle to these to use ESP with `lv_fs_littlefs`, as all functions use that `lfs_t` in LittleFS to identify the mounted partition. 
+
+
+In case you don't find a special function in the `lv_fs_littlefs` wrapper, you can look for it in the `esp_littlefs` API and use it directly, as `lv_fs_littlefs` and the `esp_littlefs` APIs can be used side-by-side. 
+
+### STDIO
+
+Bride to C standard functions on Linux and Windows. For example `fopen`, `fread`, etc.
+
+### POSIX 
+
+Bride to POSIX functions on Linux and Windows. For example `open`, `read`, etc.
+
+### WIN32 
+
+Bride to Win32 API function. For example `CreateFileA`, `ReadFile`, etc.
 
 ## Usage
 

docs/libs/index.md

@@ -12,6 +12,7 @@
    png
    gif
    freetype
+   tiny_ttf
    qrcode
    rlottie
    ffmpeg

docs/libs/tiny_ttf.md

@@ -0,0 +1,35 @@
+# Tiny TTF font engine
+
+## Usage
+
+Use https://github.com/nothings/stb to render TrueType fonts in LVGL.
+
+When enabled in `lv_conf.h` with `LV_USE_TINY_TTF`
+`lv_tiny_ttf_create_data(data, data_size, font_size)` can be used to
+create a TTF font instance at the specified font size. You can then
+use that font anywhere `lv_font_t` is accepted.
+
+By default, the TTF or OTF file must be embedded as an array, either in
+a header, or loaded into RAM in order to function.
+
+However, if `LV_TINY_TTF_FILE_SUPPORT` is enabled,
+`lv_tiny_ttf_create_file(path, font_size)` will also be available,
+allowing tiny_ttf to stream from a file. The file must remain open the
+entire time the font is being used, and streaming on demand may be
+considerably slower.
+
+After a font is created, you can change the font size in pixels by using
+`lv_tiny_ttf_set_size(font, font_size)`.
+
+By default, a font will use up to 4KB of cache to speed up rendering
+glyphs. This maximum can be changed by using
+`lv_tiny_ttf_create_data_ex(data, data_size, font_size, cache_size)`
+or `lv_tiny_ttf_create_file_ex(path, font_size, cache_size)` (when
+available). The cache size is indicated in bytes.
+
+## API
+
+```eval_rst
+.. doxygenfile:: lv_tiny_ttf.h
+  :project: lvgl
+```

docs/overview/display.md

@@ -67,7 +67,7 @@ The Alpha channel of 32-bit colors will be 0 where there are no objects and 255
 
 In summary, to enable transparent screens and displays for OSD menu-like UIs:
 - Enable `LV_COLOR_SCREEN_TRANSP` in `lv_conf.h`
-- Set the screen's opacity to `LV_OPA_TRANSP` e.g. with `lv_obj_set_style_local_bg_opa(lv_scr_act(), LV_OBJMASK_PART_MAIN, LV_STATE_DEFAULT, LV_OPA_TRANSP)`
+- Set the screen's opacity to `LV_OPA_TRANSP` e.g. with `lv_obj_set_style_bg_opa(lv_scr_act(), LV_OPA_TRANSP, LV_PART_MAIN)`
 - Set the display opacity to `LV_OPA_TRANSP` with `lv_disp_set_bg_opa(NULL, LV_OPA_TRANSP);`
 
 ## Features of displays

docs/overview/object.md

@@ -173,7 +173,7 @@ All inputs are disabled during the screen animation.
 Screens are created on the currently selected *default display*.
 The *default display* is the last registered display with `lv_disp_drv_register`. You can also explicitly select a new default display using `lv_disp_set_default(disp)`.
 
-`lv_scr_act()`, `lv_scr_load()` and `lv_scr_load_anim()` operate on the default screen.
+`lv_scr_act()`, `lv_scr_load()` and `lv_scr_load_anim()` operate on the default display.
 
 Visit [Multi-display support](/overview/display) to learn more.
 

docs/overview/style-props.md

@@ -355,7 +355,7 @@ Set the opacity of the border. Value 0, `LV_OPA_0` or `LV_OPA_TRANSP` means full
 </ul>
 
 ### border_width
-Set hte width of the border. Only pixel values can be used.
+Set the width of the border. Only pixel values can be used.
 <ul>
 <li style='display:inline; margin-right: 20px; margin-left: 0px'><strong>Default</strong> 0</li>
 <li style='display:inline; margin-right: 20px; margin-left: 0px'><strong>Inherited</strong> No</li>
@@ -708,6 +708,15 @@ Scale down all opacity values of the object by this factor. Value 0, `LV_OPA_0`
 <li style='display:inline; margin-right: 20px; margin-left: 0px'><strong>Ext. draw</strong> No</li>
 </ul>
 
+### opa_layered
+First draw the object on the layer, then scale down layer opacity factor. Value 0, `LV_OPA_0` or `LV_OPA_TRANSP` means fully transparent, 255, `LV_OPA_100` or `LV_OPA_COVER` means fully covering, other values or LV_OPA_10, LV_OPA_20, etc means semi transparency.
+<ul>
+<li style='display:inline; margin-right: 20px; margin-left: 0px'><strong>Default</strong> `LV_OPA_COVER`</li>
+<li style='display:inline; margin-right: 20px; margin-left: 0px'><strong>Inherited</strong> Yes</li>
+<li style='display:inline; margin-right: 20px; margin-left: 0px'><strong>Layout</strong> No</li>
+<li style='display:inline; margin-right: 20px; margin-left: 0px'><strong>Ext. draw</strong> No</li>
+</ul>
+
 ### color_filter_dsc
 Mix a color to all colors of the object.
 <ul>
@@ -772,7 +781,7 @@ Describes how to blend the colors to the background. The possible values are `LV
 </ul>
 
 ### layout
-Set the layout if the object. The children will be repositioned and resized according to the policies set for the layout. For the possible values see the documentation of the layouts.
+Set the layout of the object. The children will be repositioned and resized according to the policies set for the layout. For the possible values see the documentation of the layouts.
 <ul>
 <li style='display:inline; margin-right: 20px; margin-left: 0px'><strong>Default</strong> 0</li>
 <li style='display:inline; margin-right: 20px; margin-left: 0px'><strong>Inherited</strong> No</li>

docs/widgets/core/dropdown.md

@@ -43,7 +43,7 @@ Options are passed to the drop-down list as a string with `lv_dropdown_set_optio
 
 The `lv_dropdown_add_option(dropdown, "New option", pos)` function inserts a new option to `pos` index.
 
-To save memory the options can set from a static(constant) string too with `lv_dropdown_set_static_options(dropdown, options)`.
+To save memory the options can set from a static(constant) string too with `lv_dropdown_set_options_static(dropdown, options)`.
 In this case the options string should be alive while the drop-down list exists and `lv_dropdown_add_option` can't be used
 
 You can select an option manually with `lv_dropdown_set_selected(dropdown, id)`, where `id` is the index of an option.

docs/widgets/core/label.md

@@ -44,7 +44,9 @@ This is not the case with `lv_label_set_text_static`. The buffer you pass to `lv
 
 ### Text recolor
 In the text, you can use commands to recolor parts of the text. For example: `"Write a #ff0000 red# word"`.
-This feature can be enabled individually for each label by `lv_label_set_recolor()` function.
+This feature can be enabled individually for each label by `lv_label_set_recolor()` function,
+recoloring is only supported when the text wrapped with `##ff0000 ... #`sintax is in one line,
+it is not supported in wrapped text, see example `Line wrap, recoloring and scrolling`.
 
 ### Text selection
 If enabled by `LV_LABEL_TEXT_SELECTION` part of the text can be selected. It's similar to when you use your mouse on a PC to select a text.

docs/widgets/extra/calendar.md

@@ -1,5 +1,7 @@
 # Calendar (lv_calendar)
 
+**From v8.1 the header is added directly into the Calendar widget and the API of the headers has been changed.**
+
 ## Overview
 
 The Calendar object is a classic calendar which can:
@@ -13,13 +15,16 @@ The Calendar is added to the default group (if it is set). Calendar is an editab
 To make the Calendar flexible, by default it doesn't show the current year or month. Instead, there are optional "headers" that can be attached to the calendar.
 
 ## Parts and Styles
-The calendar object uses the [Button matrix](/widgets/core/btnmatrix) object under the hood to arrange the days into a matrix.
-- `LV_PART_MAIN` The background of the calendar. Uses all the background related style properties.
-- `LV_PART_ITEMS` Refers to the dates and day names. Button matrix control flags are set to differentiate the buttons and a custom drawer event is added modify the properties of the buttons as follows:
-   - day names have no border, no background and drawn with a gray color
-   - days of the previous and next month have `LV_BTNMATRIX_CTRL_DISABLED` flag
-   - today has a thicker border with the theme's primary color
-   - highlighted days have some opacity with the theme's primary color.
+The Calendar is composed of 3 widegets
+- Container: A rectangle which is a container for the *Header* and the *Days*. Uses only `LV_PART_MAIN` where all the background related style properties are working.
+- Days: It's a [Button matrix](/widgets/core/btnmatrix) object under the hood to arrange the days into a matrix. `lv_calendar_get_btnmatrix(calendar)` can be used to get it.
+    - `LV_PART_MAIN` The background of the calendar. Uses all the background related style properties.
+    - `LV_PART_ITEMS` Refers to the dates and day names. Button matrix control flags are set to differentiate the buttons and a custom drawer event is added modify the properties of the buttons as follows:
+       - day names have no border, no background and drawn with a gray color
+       - days of the previous and next month have `LV_BTNMATRIX_CTRL_DISABLED` flag
+       - today has a thicker border with the theme's primary color
+       - highlighted days have some opacity with the theme's primary color.
+- Header: Not created by default, the details are up to the given header.
 
 ## Usage
 
@@ -53,8 +58,6 @@ Learn more about [Keys](/overview/indev).
 
 ## Headers
 
-**From v8.1 the header is added directly into the Calendar widget and the API of the headers has been changed.**
-
 ### Arrow buttons
 
 `lv_calendar_header_arrow_create(calendar)` creates a header that contains a left and right arrow on the sides and a text with the current year and month between them.

env_support/cmake/custom.cmake

@@ -63,6 +63,12 @@ install(
   FILES_MATCHING
   PATTERN "*.h")
 
+install(
+  FILES "${LV_CONF_PATH}"
+  DESTINATION "${CMAKE_INSTALL_PREFIX}/${INC_INSTALL_DIR}/../"
+  RENAME "lv_conf.h"
+  OPTIONAL)
+
 set_target_properties(
   lvgl
   PROPERTIES OUTPUT_NAME lvgl

env_support/cmsis-pack/LVGL.lvgl.pdsc

@@ -36,8 +36,19 @@
   <repository type="git">https://github.com/lvgl/lvgl.git</repository>
 
   <releases>
-    <release date="2023-08-04" version="8.3.9" url="https://raw.githubusercontent.com/lvgl/lvgl/master/env_support/cmsis-pack/LVGL.lvgl.8.3.9.pack">
-      - LVGL 8.3.9
+    <release date="2023-12-05" version="8.3.11" url="https://raw.githubusercontent.com/lvgl/lvgl/master/env_support/cmsis-pack/LVGL.lvgl.8.3.11.pack">
+      - LVGL 8.3.11
+      - Add LittleFS Library to LVGL8
+      - Backport Tiny TTF to LVGL8
+      - Some minor fixes
+    </release>
+    <release date="2023-09-19" version="8.3.10" url="https://github.com/lvgl/lvgl/raw/9e388055ec0bcad5179461e66d6dac6823129eee/env_support/cmsis-pack/LVGL.lvgl.8.3.10.pack">
+      - LVGL 8.3.10
+      - Some minor fixes
+    </release>
+    
+    <release date="2023-08-04" version="8.3.9" url="https://github.com/lvgl/lvgl/raw/bdf5bfb88ce107f16cf9128cf75e61394b3219d0/env_support/cmsis-pack/LVGL.lvgl.8.3.9.pack">
+      - LVGL 8.3.10
       - Add snapshot, fragment, imgfont, gridnav, msg and monkey
       - Other minor fixes
     </release>
@@ -299,7 +310,7 @@
   -->
 
     <components>
-        <bundle Cbundle="LVGL" Cclass="LVGL" Cversion="8.3.9">
+        <bundle Cbundle="LVGL" Cclass="LVGL" Cversion="8.3.11">
             <description>LVGL (Light and Versatile Graphics Library) is a free and open-source graphics library providing everything you need to create an embedded GUI with easy-to-use graphical elements, beautiful visual effects and a low memory footprint.</description>
             <doc></doc>
             <component Cgroup="lvgl" Csub="Essential" >
@@ -432,7 +443,7 @@
                 <file category="sourceC"            name="src/widgets/lv_textarea.c" />
 
                 <!-- general -->
-                <file category="preIncludeGlobal"   name="lv_conf_cmsis.h" attr="config" version="1.0.3" />
+                <file category="preIncludeGlobal"   name="lv_conf_cmsis.h" attr="config" version="1.0.4" />
                 <file category="sourceC"            name="lv_cmsis_pack.c" attr="config" version="1.0.0" />
                 <file category="header"             name="lvgl.h" />
                 <file category="doc"                name="README.md"/>
@@ -717,9 +728,26 @@
                 <file category="sourceC"            name="src/extra/libs/fsdrv/lv_fs_fatfs.c" />
                 <file category="sourceC"            name="src/extra/libs/fsdrv/lv_fs_posix.c" />
                 <file category="sourceC"            name="src/extra/libs/fsdrv/lv_fs_stdio.c" />
+                <file category="sourceC"            name="src/extra/libs/fsdrv/lv_fs_littlefs.c" />
               </files>
 
             </component>
+            
+            <component Cgroup="lvgl" Csub="Libs Tiny TTF"  condition="LVGL-Essential">
+              <description>Add Tiny TTF Library</description>
+              <files>
+                <!-- src/extra/libs/tiny_ttf -->
+                <file category="sourceC"            name="src/extra/libs/tiny_ttf/lv_tiny_ttf.c" />
+              </files>
+              
+              <RTE_Components_h>
+
+/*! \brief enable Tiny TTF Library */
+#define LV_USE_TINY_TTF         1
+              </RTE_Components_h>
+              
+            </component>
+
 
             <component Cgroup="lvgl" Csub="Libs RLOTTIE"  condition="LVGL-Essential">
               <description>Add RLOTTIE support, an extra librbary is required.</description>
@@ -731,7 +759,7 @@
               <RTE_Components_h>
 
 /*! \brief enable RLOTTIE support */
-#define LV_USE_RLOTTIE         1
+#define LV_USE_RLOTTIE          1
               </RTE_Components_h>
 
             </component>
@@ -746,7 +774,7 @@
               <RTE_Components_h>
 
 /*! \brief enable ffmpeg support */
-#define LV_USE_FFMPEG         1
+#define LV_USE_FFMPEG           1
               </RTE_Components_h>
 
             </component>
@@ -761,7 +789,7 @@
               <RTE_Components_h>
 
 /*! \brief enable ffmpeg support */
-#define LV_USE_IME_PINYIN         1
+#define LV_USE_IME_PINYIN       1
               </RTE_Components_h>
 
             </component>
@@ -807,7 +835,7 @@
               <RTE_Components_h>
 
 /*! \brief enable the Grid Navigation support*/
-#define LV_USE_GRIDNAV         1
+#define LV_USE_GRIDNAV          1
               </RTE_Components_h>
 
             </component>
@@ -822,7 +850,7 @@
               <RTE_Components_h>
 
 /*! \brief enable the image font support*/
-#define LV_USE_IMGFONT         1
+#define LV_USE_IMGFONT          1
               </RTE_Components_h>
 
             </component>
@@ -837,7 +865,7 @@
               <RTE_Components_h>
 
 /*! \brief enable the monkey service support*/
-#define LV_USE_MONKEY         1
+#define LV_USE_MONKEY           1
               </RTE_Components_h>
 
             </component>
@@ -852,7 +880,7 @@
               <RTE_Components_h>
 
 /*! \brief enable the message service support*/
-#define LV_USE_MSG         1
+#define LV_USE_MSG              1
               </RTE_Components_h>
 
             </component>
@@ -881,7 +909,7 @@
               <RTE_Components_h>
 
 /*! \brief enable demo:bencharmk */
-#define LV_USE_DEMO_BENCHMARK         1
+#define LV_USE_DEMO_BENCHMARK    1
               </RTE_Components_h>
 
             </component>
@@ -901,7 +929,7 @@
               <RTE_Components_h>
 
 /*! \brief enable demo:widgets support */
-#define LV_USE_DEMO_WIDGETS         1
+#define LV_USE_DEMO_WIDGETS     1
               </RTE_Components_h>
 
             </component>

env_support/cmsis-pack/LVGL.pidx

@@ -2,8 +2,8 @@
 <index schemaVersion="1.0.0" xs:noNamespaceSchemaLocation="PackIndex.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance">
   <vendor>LVGL</vendor>
   <url>https://raw.githubusercontent.com/lvgl/lvgl/master/env_support/cmsis-pack/</url>
-  <timestamp>2023-08-04</timestamp>
+  <timestamp>2023-12-09</timestamp>
   <pindex>
-    <pdsc url="https://raw.githubusercontent.com/lvgl/lvgl/release/v8.3/env_support/cmsis-pack/" vendor="LVGL" name="lvgl" version="8.3.9"/>
+    <pdsc url="https://raw.githubusercontent.com/lvgl/lvgl/release/v8.3/env_support/cmsis-pack/" vendor="LVGL" name="lvgl" version="8.3.11"/>
   </pindex>
 </index>

env_support/cmsis-pack/README.md

@@ -46,12 +46,33 @@ remove the misleading guide above this code segment.
    - LV_USE_GPU_SWM341_DMA2D
    - LV_USE_GPU_ARM2D
    - LV_USE_IME_PINYIN
+   - LV_USE_PNG
+   - LV_USE_BMP
+   - LV_USE_SJPG
+   - LV_USE_GIF
+   - LV_USE_QRCODE
+   - LV_USE_FREETYPE
+   - LV_USE_TINY_TTF
+   - LV_USE_RLOTTIE
+   - LV_USE_FFMPEG
+   - LV_USE_SNAPSHOT
+   - LV_USE_MONKEY
+   - LV_USE_GRIDNAV
+   - LV_USE_FRAGMENT
+   - LV_USE_IMGFONT
+   - LV_USE_MSG
+   - LV_USE_IME_PINYIN
 5. Update macro `LV_ATTRIBUTE_MEM_ALIGN` and `LV_ATTRIBUTE_MEM_ALIGN_SIZE`  to force a WORD alignment.
 ```c
 #define LV_ATTRIBUTE_MEM_ALIGN_SIZE     4
 #define LV_ATTRIBUTE_MEM_ALIGN          __attribute__((aligned(4)))
 ```
 Update macro `LV_MEM_SIZE` to `(64*1024U)`.
+
+Update macro `LV_FONT_MONTSERRAT_12` to `1`.
+
+Update macro `LV_FONT_MONTSERRAT_12` to `1`.
+
 6. Update Theme related macros:
 
 ```c
@@ -89,25 +110,41 @@ Update macro `LV_MEM_SIZE` to `(64*1024U)`.
     #define LV_TICK_CUSTOM 1
     #if LV_TICK_CUSTOM
         extern uint32_t SystemCoreClock;
-        #define LV_TICK_CUSTOM_INCLUDE             "perf_counter.h"
-
-        #if __PER_COUNTER_VER__ < 10902ul
-            #define LV_TICK_CUSTOM_SYS_TIME_EXPR    ((uint32_t)get_system_ticks() / (SystemCoreClock / 1000ul))
-        #else
-            #define LV_TICK_CUSTOM_SYS_TIME_EXPR    get_system_ms()
-        #endif
+        #define LV_TICK_CUSTOM_INCLUDE          "perf_counter.h"
+        #define LV_TICK_CUSTOM_SYS_TIME_EXPR    get_system_ms()
     #endif   /*LV_TICK_CUSTOM*/
 #else
     #define LV_TICK_CUSTOM 0
     #if LV_TICK_CUSTOM
         #define LV_TICK_CUSTOM_INCLUDE "Arduino.h"         /*Header for the system time function*/
         #define LV_TICK_CUSTOM_SYS_TIME_EXPR (millis())    /*Expression evaluating to current system time in ms*/
+    /*If using lvgl as ESP32 component*/
+    // #define LV_TICK_CUSTOM_INCLUDE "esp_timer.h"
+    // #define LV_TICK_CUSTOM_SYS_TIME_EXPR ((esp_timer_get_time() / 1000LL))
     #endif   /*LV_TICK_CUSTOM*/
 #endif       /*__PERF_COUNTER__*/
 ```
-9. Thoroughly remove the `DEMO USAGE` section.
-10. Thoroughly remove the '3rd party libraries' section.
-10. rename '**lv_conf_template.h**' to '**lv_conf_cmsis.h**'.
+
+
+9. Remove all content in `DEMO USAGE` section but keep the following:
+
+```c
+/*Show some widget. It might be required to increase `LV_MEM_SIZE` */
+#if LV_USE_DEMO_WIDGETS
+	#define LV_DEMO_WIDGETS_SLIDESHOW 0
+#endif
+
+/*Benchmark your system*/
+#if LV_USE_DEMO_BENCHMARK
+/*Use RGB565A8 images with 16 bit color depth instead of ARGB8565*/
+	#define LV_DEMO_BENCHMARK_RGB565A8 1
+#endif
+```
+
+
+
+10. Thoroughly remove the `3rd party libraries` section.
+11. rename '**lv_conf_template.h**' to '**lv_conf_cmsis.h**'.
 
 
 

env_support/cmsis-pack/lv_conf_cmsis.h

@@ -1,6 +1,6 @@
 /**
  * @file lv_conf.h
- * Configuration file for v8.3.9
+ * Configuration file for v8.3.11
  */
 
 /* clang-format off */
@@ -76,6 +76,7 @@
 /*Input device read period in milliseconds*/
 #define LV_INDEV_DEF_READ_PERIOD 30     /*[ms]*/
 
+
 /*Use a custom tick source that tells the elapsed time in milliseconds.
  *It removes the need to manually update the tick with `lv_tick_inc()`)*/
 #ifdef __PERF_COUNTER__
@@ -90,12 +91,13 @@
     #if LV_TICK_CUSTOM
         #define LV_TICK_CUSTOM_INCLUDE "Arduino.h"         /*Header for the system time function*/
         #define LV_TICK_CUSTOM_SYS_TIME_EXPR (millis())    /*Expression evaluating to current system time in ms*/
-        /*If using lvgl as ESP32 component*/
-        // #define LV_TICK_CUSTOM_INCLUDE "esp_timer.h"
-        // #define LV_TICK_CUSTOM_SYS_TIME_EXPR ((esp_timer_get_time() / 1000LL))
+    /*If using lvgl as ESP32 component*/
+    // #define LV_TICK_CUSTOM_INCLUDE "esp_timer.h"
+    // #define LV_TICK_CUSTOM_SYS_TIME_EXPR ((esp_timer_get_time() / 1000LL))
     #endif   /*LV_TICK_CUSTOM*/
 #endif       /*__PERF_COUNTER__*/
 
+
 /*Default Dot Per Inch. Used to initialize default sizes such as widgets sized, style paddings.
  *(Not so important, you can adjust it to modify default sizes and spaces)*/
 #define LV_DPI_DEF 130     /*[px/inch]*/
@@ -178,6 +180,7 @@
  * GPU
  *-----------*/
 
+
 /*Use STM32's DMA2D (aka Chrom Art) GPU*/
 #if LV_USE_GPU_STM32_DMA2D
     /*Must be defined to include path of CMSIS header of target processor
@@ -185,6 +188,13 @@
     #define LV_GPU_DMA2D_CMSIS_INCLUDE
 #endif
 
+/*Enable RA6M3 G2D GPU*/
+#if LV_USE_GPU_RA6M3_G2D
+    /*include path of target processor
+    e.g. "hal_data.h"*/
+    #define LV_GPU_RA6M3_G2D_INCLUDE "hal_data.h"
+#endif
+
 /*Use SWM341's DMA2D GPU*/
 #if LV_USE_GPU_SWM341_DMA2D
     #define LV_GPU_SWM341_DMA2D_INCLUDE "SWM341.h"
@@ -200,22 +210,6 @@
     #define LV_USE_GPU_NXP_PXP_AUTO_INIT 0
 #endif
 
-#if LV_USE_GPU_RA6M3_G2D
-    /*include path of target processor
-    e.g. "hal_data.h"*/
-    #define LV_GPU_RA6M3_G2D_INCLUDE "hal_data.h"
-#endif
-
-/*Use SDL renderer API*/
-#define LV_USE_GPU_SDL 0
-#if LV_USE_GPU_SDL
-    #define LV_GPU_SDL_INCLUDE_PATH <SDL2/SDL.h>
-    /*Texture cache size, 8MB by default*/
-    #define LV_GPU_SDL_LRU_SIZE (1024 * 1024 * 8)
-    /*Custom blend mode for mask drawing, disable if you need to link with older SDL2 lib*/
-    #define LV_GPU_SDL_CUSTOM_BLEND_MODE (SDL_VERSION_ATLEAST(2, 0, 6))
-#endif
-
 /*-------------
  * Logging
  *-----------*/
@@ -231,11 +225,11 @@
     *LV_LOG_LEVEL_ERROR       Only critical issue, when the system may fail
     *LV_LOG_LEVEL_USER        Only logs added by the user
     *LV_LOG_LEVEL_NONE        Do not log anything*/
-    #define LV_LOG_LEVEL LV_LOG_LEVEL_USER
+    #define LV_LOG_LEVEL LV_LOG_LEVEL_WARN
 
     /*1: Print the log with 'printf';
     *0: User need to register a callback with `lv_log_register_print_cb()`*/
-    #define LV_LOG_PRINTF 1
+    #define LV_LOG_PRINTF 0
 
     /*Enable/disable LV_LOG_TRACE in modules that produces a huge number of logs*/
     #define LV_LOG_TRACE_MEM        1
@@ -588,7 +582,6 @@
     #define LV_USE_THEME_BASIC      0
     #define LV_USE_THEME_MONO       0
 #endif
-
 /*-----------
  * Layouts
  *----------*/
@@ -599,28 +592,86 @@
 /*A layout similar to Grid in CSS.*/
 #define LV_USE_GRID 1
 
+/*---------------------
+ * 3rd party libraries
+ *--------------------*/
+
+/*File system interfaces for common APIs */
+
+/*API for fopen, fread, etc*/
+#define LV_USE_FS_STDIO 0
+#if LV_USE_FS_STDIO
+    #define LV_FS_STDIO_LETTER '\0'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
+    #define LV_FS_STDIO_PATH ""         /*Set the working directory. File/directory paths will be appended to it.*/
+    #define LV_FS_STDIO_CACHE_SIZE 0    /*>0 to cache this number of bytes in lv_fs_read()*/
+#endif
+
+/*API for open, read, etc*/
+#define LV_USE_FS_POSIX 0
+#if LV_USE_FS_POSIX
+    #define LV_FS_POSIX_LETTER '\0'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
+    #define LV_FS_POSIX_PATH ""         /*Set the working directory. File/directory paths will be appended to it.*/
+    #define LV_FS_POSIX_CACHE_SIZE 0    /*>0 to cache this number of bytes in lv_fs_read()*/
+#endif
+
+/*API for CreateFile, ReadFile, etc*/
+#define LV_USE_FS_WIN32 0
+#if LV_USE_FS_WIN32
+    #define LV_FS_WIN32_LETTER '\0'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
+    #define LV_FS_WIN32_PATH ""         /*Set the working directory. File/directory paths will be appended to it.*/
+    #define LV_FS_WIN32_CACHE_SIZE 0    /*>0 to cache this number of bytes in lv_fs_read()*/
+#endif
+
+/*API for FATFS (needs to be added separately). Uses f_open, f_read, etc*/
+#define LV_USE_FS_FATFS 0
+#if LV_USE_FS_FATFS
+    #define LV_FS_FATFS_LETTER '\0'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
+    #define LV_FS_FATFS_CACHE_SIZE 0    /*>0 to cache this number of bytes in lv_fs_read()*/
+#endif
+
+/*API for LittleFS (library needs to be added separately). Uses lfs_file_open, lfs_file_read, etc*/
+#define LV_USE_FS_LITTLEFS 0
+#if LV_USE_FS_LITTLEFS
+    #define LV_FS_LITTLEFS_LETTER '\0'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
+    #define LV_FS_LITTLEFS_CACHE_SIZE 0    /*>0 to cache this number of bytes in lv_fs_read()*/
+#endif
+
+
+
+/*FreeType library*/
+#if LV_USE_FREETYPE
+    /*Memory used by FreeType to cache characters [bytes] (-1: no caching)*/
+    #define LV_FREETYPE_CACHE_SIZE (16 * 1024)
+    #if LV_FREETYPE_CACHE_SIZE >= 0
+        /* 1: bitmap cache use the sbit cache, 0:bitmap cache use the image cache. */
+        /* sbit cache:it is much more memory efficient for small bitmaps(font size < 256) */
+        /* if font size >= 256, must be configured as image cache */
+        #define LV_FREETYPE_SBIT_CACHE 0
+        /* Maximum number of opened FT_Face/FT_Size objects managed by this cache instance. */
+        /* (0:use system defaults) */
+        #define LV_FREETYPE_CACHE_FT_FACES 0
+        #define LV_FREETYPE_CACHE_FT_SIZES 0
+    #endif
+#endif
+
+/*Tiny TTF library*/
+#if LV_USE_TINY_TTF
+    /*Load TTF data from files*/
+    #define LV_TINY_TTF_FILE_SUPPORT 0
+#endif
+
+
+/*FFmpeg library for image decoding and playing videos
+ *Supports all major image formats so do not enable other image decoder with it*/
+#if LV_USE_FFMPEG
+    /*Dump input information to stderr*/
+    #define LV_FFMPEG_DUMP_FORMAT 0
+#endif
+
 /*-----------
  * Others
  *----------*/
 
-/*1: Enable API to take snapshot for object*/
-#define LV_USE_SNAPSHOT 0
-
-/*1: Enable Monkey test*/
-#define LV_USE_MONKEY 0
-
-/*1: Enable grid navigation*/
-#define LV_USE_GRIDNAV 0
-
-/*1: Enable lv_obj fragment*/
-#define LV_USE_FRAGMENT 0
-
-/*1: Support using images as font in label or span widgets */
-#define LV_USE_IMGFONT 0
-
-/*1: Enable a published subscriber based messaging system */
-#define LV_USE_MSG 0
-
 /*1: Enable Pinyin input method*/
 /*Requires: lv_keyboard*/
 #if LV_USE_IME_PINYIN
@@ -645,6 +696,20 @@
 /*Enable the examples to be built with the library*/
 #define LV_BUILD_EXAMPLES 1
 
+/*===================
+ * DEMO USAGE
+ ====================*/
+
+/*Show some widget. It might be required to increase `LV_MEM_SIZE` */
+#if LV_USE_DEMO_WIDGETS
+    #define LV_DEMO_WIDGETS_SLIDESHOW 0
+#endif
+
+/*Benchmark your system*/
+#if LV_USE_DEMO_BENCHMARK
+/*Use RGB565A8 images with 16 bit color depth instead of ARGB8565*/
+    #define LV_DEMO_BENCHMARK_RGB565A8 1
+#endif
 
 /*--END OF LV_CONF_H--*/
 

env_support/rt-thread/lv_rt_thread_port.c

@@ -69,7 +69,7 @@ static int lvgl_thread_init(void)
     rt_err_t err;
 
     err = rt_thread_init(&lvgl_thread, "LVGL", lvgl_thread_entry, RT_NULL,
-           &lvgl_thread_stack[0], sizeof(lvgl_thread_stack), PKG_LVGL_THREAD_PRIO, 0);
+           &lvgl_thread_stack[0], sizeof(lvgl_thread_stack), PKG_LVGL_THREAD_PRIO, 10);
     if(err != RT_EOK)
     {
         LOG_E("Failed to create LVGL thread");

examples/lv_examples.mk

@@ -1 +1 @@
-CSRCS += $(shell find -L $(LVGL_DIR)/$(LVGL_DIR_NAME)/examples -name \*.c)
+CSRCS += $(shell find -L $(LVGL_DIR)/$(LVGL_DIR_NAME)/examples -name "*.c")

library.json

@@ -1,6 +1,6 @@
 {
 	"name": "lvgl",
-	"version": "8.3.9",
+	"version": "8.3.11",
 	"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

@@ -1,5 +1,5 @@
 name=lvgl
-version=8.3.9
+version=8.3.11
 author=kisvegabor
 maintainer=kisvegabor,embeddedt,pete-pjb
 sentence=Full-featured Graphics Library for Embedded Systems

lv_conf_template.h

@@ -1,6 +1,6 @@
 /**
  * @file lv_conf.h
- * Configuration file for v8.3.9
+ * Configuration file for v8.3.11
  */
 
 /*
@@ -639,6 +639,13 @@
     #define LV_FS_FATFS_CACHE_SIZE 0    /*>0 to cache this number of bytes in lv_fs_read()*/
 #endif
 
+/*API for LittleFS (library needs to be added separately). Uses lfs_file_open, lfs_file_read, etc*/
+#define LV_USE_FS_LITTLEFS 0
+#if LV_USE_FS_LITTLEFS
+    #define LV_FS_LITTLEFS_LETTER '\0'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
+    #define LV_FS_LITTLEFS_CACHE_SIZE 0    /*>0 to cache this number of bytes in lv_fs_read()*/
+#endif
+
 /*PNG decoder library*/
 #define LV_USE_PNG 0
 
@@ -672,6 +679,13 @@
     #endif
 #endif
 
+/*Tiny TTF library*/
+#define LV_USE_TINY_TTF 0
+#if LV_USE_TINY_TTF
+    /*Load TTF data from files*/
+    #define LV_TINY_TTF_FILE_SUPPORT 0
+#endif
+
 /*Rlottie library*/
 #define LV_USE_RLOTTIE 0
 

lvgl.h

@@ -15,7 +15,7 @@ extern "C" {
  ***************************/
 #define LVGL_VERSION_MAJOR 8
 #define LVGL_VERSION_MINOR 3
-#define LVGL_VERSION_PATCH 9
+#define LVGL_VERSION_PATCH 11
 #define LVGL_VERSION_INFO ""
 
 /*********************

scripts/style_api_gen.py

@@ -163,7 +163,7 @@ props = [
 
 {'name': 'BORDER_WIDTH',
  'style_type': 'num',   'var_type': 'lv_coord_t' ,  'default':0, 'inherited': 0, 'layout': 1, 'ext_draw': 0,
- 'dsc': "Set hte width of the border. Only pixel values can be used."},
+ 'dsc': "Set the width of the border. Only pixel values can be used."},
 
 {'name': 'BORDER_SIDE',
  'style_type': 'num',   'var_type': 'lv_border_side_t',  'default':'`LV_BORDER_SIDE_NONE`', 'inherited': 0, 'layout': 0, 'ext_draw': 0,
@@ -316,6 +316,10 @@ props = [
  'style_type': 'num',   'var_type': 'lv_opa_t',  'default':'`LV_OPA_COVER`', 'inherited': 1, 'layout': 0, 'ext_draw': 0,
  'dsc': "Scale down all opacity values of the object by this factor. Value 0, `LV_OPA_0` or `LV_OPA_TRANSP` means fully transparent, 255, `LV_OPA_100` or `LV_OPA_COVER` means fully covering, other values or LV_OPA_10, LV_OPA_20, etc means semi transparency." },
 
+{'name': 'OPA_LAYERED',
+ 'style_type': 'num',   'var_type': 'lv_opa_t',  'default':'`LV_OPA_COVER`', 'inherited': 1, 'layout': 0, 'ext_draw': 0,
+ 'dsc': "First draw the object on the layer, then scale down layer opacity factor. Value 0, `LV_OPA_0` or `LV_OPA_TRANSP` means fully transparent, 255, `LV_OPA_100` or `LV_OPA_COVER` means fully covering, other values or LV_OPA_10, LV_OPA_20, etc means semi transparency." },
+
 {'name': 'COLOR_FILTER_DSC',
  'style_type': 'ptr',   'var_type': 'const lv_color_filter_dsc_t *',  'default':'`NULL`', 'inherited': 0, 'layout': 0, 'ext_draw': 0,
  'dsc': "Mix a color to all colors of the object." },
@@ -346,7 +350,7 @@ props = [
 
 {'name': 'LAYOUT',
  'style_type': 'num',   'var_type': 'uint16_t', 'default':0, 'inherited': 0, 'layout': 1, 'ext_draw': 0,
- 'dsc': "Set the layout if the object. The children will be repositioned and resized according to the policies set for the layout. For the possible values see the documentation of the layouts."},
+ 'dsc': "Set the layout of the object. The children will be repositioned and resized according to the policies set for the layout. For the possible values see the documentation of the layouts."},
 
 {'name': 'BASE_DIR',
  'style_type': 'num',   'var_type': 'lv_base_dir_t', 'default':'`LV_BASE_DIR_AUTO`', 'inherited': 1, 'layout': 1, 'ext_draw': 0,

src/core/lv_disp.c

@@ -224,9 +224,13 @@ void lv_scr_load_anim(lv_obj_t * new_scr, lv_scr_load_anim_t anim_type, uint32_t
     lv_disp_t * d = lv_obj_get_disp(new_scr);
     lv_obj_t * act_scr = lv_scr_act();
 
+    if(act_scr == new_scr || d->scr_to_load == new_scr) {
+        return;
+    }
+
     /*If an other screen load animation is in progress
      *make target screen loaded immediately. */
-    if(d->scr_to_load && act_scr != d->scr_to_load) {
+    if(d->scr_to_load) {
         scr_load_internal(d->scr_to_load);
         lv_anim_del(d->scr_to_load, NULL);
         lv_obj_set_pos(d->scr_to_load, 0, 0);
@@ -258,7 +262,6 @@ void lv_scr_load_anim(lv_obj_t * new_scr, lv_scr_load_anim_t anim_type, uint32_t
     lv_obj_remove_local_style_prop(new_scr, LV_STYLE_OPA, 0);
     lv_obj_remove_local_style_prop(lv_scr_act(), LV_STYLE_OPA, 0);
 
-
     /*Shortcut for immediate load*/
     if(time == 0 && delay == 0) {
         scr_load_internal(new_scr);
@@ -478,6 +481,7 @@ static void scr_load_internal(lv_obj_t * scr)
     if(d->act_scr) lv_event_send(scr, LV_EVENT_SCREEN_LOAD_START, NULL);
 
     d->act_scr = scr;
+    d->scr_to_load = NULL;
 
     if(d->act_scr) lv_event_send(scr, LV_EVENT_SCREEN_LOADED, NULL);
     if(d->act_scr) lv_event_send(old_scr, LV_EVENT_SCREEN_UNLOADED, NULL);

src/core/lv_obj.c

@@ -149,9 +149,9 @@ void lv_init(void)
     lv_img_cache_set_size(LV_IMG_CACHE_DEF_SIZE);
 #endif
     /*Test if the IDE has UTF-8 encoding*/
-    char * txt = "Á";
+    const char * txt = "Á";
 
-    uint8_t * txt_u8 = (uint8_t *)txt;
+    const uint8_t * txt_u8 = (uint8_t *)txt;
     if(txt_u8[0] != 0xc3 || txt_u8[1] != 0x81 || txt_u8[2] != 0x00) {
         LV_LOG_WARN("The strings have no UTF-8 encoding. Non-ASCII characters won't be displayed.");
     }
@@ -513,6 +513,11 @@ static void lv_obj_draw(lv_event_t * e)
             return;
         }
 
+        if(lv_obj_get_style_opa(obj, LV_PART_MAIN) < LV_OPA_MAX) {
+            info->res = LV_COVER_RES_NOT_COVER;
+            return;
+        }
+
         info->res = LV_COVER_RES_COVER;
 
     }
@@ -697,7 +702,7 @@ static lv_res_t scrollbar_init_draw_dsc(lv_obj_t * obj, lv_draw_rect_dsc_t * dsc
         }
     }
 
-    lv_opa_t opa = lv_obj_get_style_opa(obj, LV_PART_SCROLLBAR);
+    lv_opa_t opa = lv_obj_get_style_opa_recursive(obj, LV_PART_SCROLLBAR);
     if(opa < LV_OPA_MAX) {
         dsc->bg_opa = (dsc->bg_opa * opa) >> 8;
         dsc->border_opa = (dsc->bg_opa * opa) >> 8;
@@ -857,6 +862,10 @@ static void lv_obj_event(const lv_obj_class_t * class_p, lv_event_t * e)
             lv_obj_mark_layout_as_dirty(obj);
         }
     }
+    else if(code == LV_EVENT_CHILD_DELETED) {
+        obj->readjust_scroll_after_layout = 1;
+        lv_obj_mark_layout_as_dirty(obj);
+    }
     else if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
         lv_coord_t d = lv_obj_calculate_ext_draw_size(obj, LV_PART_MAIN);
         lv_event_set_ext_draw_size(e, d);

src/core/lv_obj.h

@@ -183,6 +183,7 @@ typedef struct _lv_obj_t {
     lv_obj_flag_t flags;
     lv_state_t state;
     uint16_t layout_inv : 1;
+    uint16_t readjust_scroll_after_layout : 1;
     uint16_t scr_layout_inv : 1;
     uint16_t skip_trans : 1;
     uint16_t style_cnt  : 6;

src/core/lv_obj_draw.c

@@ -38,9 +38,8 @@
 
 void lv_obj_init_draw_rect_dsc(lv_obj_t * obj, uint32_t part, lv_draw_rect_dsc_t * draw_dsc)
 {
-    lv_opa_t opa = LV_OPA_COVER;
+    lv_opa_t opa = lv_obj_get_style_opa_recursive(obj, part);
     if(part != LV_PART_MAIN) {
-        opa = lv_obj_get_style_opa(obj, part);
         if(opa <= LV_OPA_MIN) {
             draw_dsc->bg_opa = LV_OPA_TRANSP;
             draw_dsc->bg_img_opa = LV_OPA_TRANSP;
@@ -180,15 +179,12 @@ void lv_obj_init_draw_rect_dsc(lv_obj_t * obj, uint32_t part, lv_draw_rect_dsc_t
         }
     }
 #endif
-
-    if(part != LV_PART_MAIN) {
-        if(opa < LV_OPA_MAX) {
-            draw_dsc->bg_opa = (opa * draw_dsc->shadow_opa) >> 8;
-            draw_dsc->bg_img_opa = (opa * draw_dsc->shadow_opa) >> 8;
-            draw_dsc->border_opa = (opa * draw_dsc->shadow_opa) >> 8;
-            draw_dsc->outline_opa = (opa * draw_dsc->shadow_opa) >> 8;
-            draw_dsc->shadow_opa = (opa * draw_dsc->shadow_opa) >> 8;
-        }
+    if(opa < LV_OPA_MAX) {
+        draw_dsc->bg_opa = (opa * draw_dsc->bg_opa) >> 8;
+        draw_dsc->bg_img_opa = (opa * draw_dsc->bg_img_opa) >> 8;
+        draw_dsc->border_opa = (opa * draw_dsc->border_opa) >> 8;
+        draw_dsc->outline_opa = (opa * draw_dsc->outline_opa) >> 8;
+        draw_dsc->shadow_opa = (opa * draw_dsc->shadow_opa) >> 8;
     }
 }
 
@@ -197,16 +193,15 @@ void lv_obj_init_draw_label_dsc(lv_obj_t * obj, uint32_t part, lv_draw_label_dsc
     draw_dsc->opa = lv_obj_get_style_text_opa(obj, part);
     if(draw_dsc->opa <= LV_OPA_MIN) return;
 
-    if(part != LV_PART_MAIN) {
-        lv_opa_t opa = lv_obj_get_style_opa(obj, part);
-        if(opa <= LV_OPA_MIN) {
-            draw_dsc->opa = LV_OPA_TRANSP;
-            return;
-        }
-        if(opa < LV_OPA_MAX) {
-            draw_dsc->opa = (opa * draw_dsc->opa) >> 8;
-        }
+    lv_opa_t opa = lv_obj_get_style_opa_recursive(obj, part);
+    if(opa <= LV_OPA_MIN) {
+        draw_dsc->opa = LV_OPA_TRANSP;
+        return;
     }
+    if(opa < LV_OPA_MAX) {
+        draw_dsc->opa = (opa * draw_dsc->opa) >> 8;
+    }
+    if(draw_dsc->opa <= LV_OPA_MIN) return;
 
     draw_dsc->color = lv_obj_get_style_text_color_filtered(obj, part);
     draw_dsc->letter_space = lv_obj_get_style_text_letter_space(obj, part);
@@ -230,16 +225,15 @@ void lv_obj_init_draw_img_dsc(lv_obj_t * obj, uint32_t part, lv_draw_img_dsc_t *
     draw_dsc->opa = lv_obj_get_style_img_opa(obj, part);
     if(draw_dsc->opa <= LV_OPA_MIN) return;
 
-    if(part != LV_PART_MAIN) {
-        lv_opa_t opa = lv_obj_get_style_opa(obj, part);
-        if(opa <= LV_OPA_MIN) {
-            draw_dsc->opa = LV_OPA_TRANSP;
-            return;
-        }
-        if(opa < LV_OPA_MAX) {
-            draw_dsc->opa = (opa * draw_dsc->opa) >> 8;
-        }
+    lv_opa_t opa = lv_obj_get_style_opa_recursive(obj, part);
+    if(opa <= LV_OPA_MIN) {
+        draw_dsc->opa = LV_OPA_TRANSP;
+        return;
     }
+    if(opa < LV_OPA_MAX) {
+        draw_dsc->opa = (opa * draw_dsc->opa) >> 8;
+    }
+    if(draw_dsc->opa <= LV_OPA_MIN) return;
 
     draw_dsc->angle = 0;
     draw_dsc->zoom = LV_IMG_ZOOM_NONE;
@@ -260,16 +254,15 @@ void lv_obj_init_draw_line_dsc(lv_obj_t * obj, uint32_t part, lv_draw_line_dsc_t
     draw_dsc->opa = lv_obj_get_style_line_opa(obj, part);
     if(draw_dsc->opa <= LV_OPA_MIN)  return;
 
-    if(part != LV_PART_MAIN) {
-        lv_opa_t opa = lv_obj_get_style_opa(obj, part);
-        if(opa <= LV_OPA_MIN) {
-            draw_dsc->opa = LV_OPA_TRANSP;
-            return;
-        }
-        if(opa < LV_OPA_MAX) {
-            draw_dsc->opa = (opa * draw_dsc->opa) >> 8;
-        }
+    lv_opa_t opa = lv_obj_get_style_opa_recursive(obj, part);
+    if(opa <= LV_OPA_MIN) {
+        draw_dsc->opa = LV_OPA_TRANSP;
+        return;
     }
+    if(opa < LV_OPA_MAX) {
+        draw_dsc->opa = (opa * draw_dsc->opa) >> 8;
+    }
+    if(draw_dsc->opa <= LV_OPA_MIN) return;
 
     draw_dsc->width = lv_obj_get_style_line_width(obj, part);
     if(draw_dsc->width == 0) return;
@@ -297,16 +290,15 @@ void lv_obj_init_draw_arc_dsc(lv_obj_t * obj, uint32_t part, lv_draw_arc_dsc_t *
     draw_dsc->opa = lv_obj_get_style_arc_opa(obj, part);
     if(draw_dsc->opa <= LV_OPA_MIN)  return;
 
-    if(part != LV_PART_MAIN) {
-        lv_opa_t opa = lv_obj_get_style_opa(obj, part);
-        if(opa <= LV_OPA_MIN) {
-            draw_dsc->opa = LV_OPA_TRANSP;
-            return;
-        }
-        if(opa < LV_OPA_MAX) {
-            draw_dsc->opa = (opa * draw_dsc->opa) >> 8;
-        }
+    lv_opa_t opa = lv_obj_get_style_opa_recursive(obj, part);
+    if(opa <= LV_OPA_MIN) {
+        draw_dsc->opa = LV_OPA_TRANSP;
+        return;
     }
+    if(opa < LV_OPA_MAX) {
+        draw_dsc->opa = (opa * draw_dsc->opa) >> 8;
+    }
+    if(draw_dsc->opa <= LV_OPA_MIN) return;
 
     draw_dsc->color = lv_obj_get_style_arc_color_filtered(obj, part);
     draw_dsc->img_src = lv_obj_get_style_arc_img_src(obj, part);

src/core/lv_obj_pos.c

@@ -200,7 +200,7 @@ bool lv_obj_refr_size(lv_obj_t * obj)
     /*Invalidate the new area*/
     lv_obj_invalidate(obj);
 
-    lv_obj_readjust_scroll(obj, LV_ANIM_OFF);
+    obj->readjust_scroll_after_layout = 1;
 
     /*If the object was out of the parent invalidate the new scrollbar area too.
      *If it wasn't out of the parent but out now, also invalidate the scrollbars*/
@@ -1137,20 +1137,24 @@ static void layout_update_core(lv_obj_t * obj)
         layout_update_core(child);
     }
 
-    if(obj->layout_inv == 0) return;
+    if(obj->layout_inv) {
+        obj->layout_inv = 0;
+        lv_obj_refr_size(obj);
+        lv_obj_refr_pos(obj);
 
-    obj->layout_inv = 0;
-
-    lv_obj_refr_size(obj);
-    lv_obj_refr_pos(obj);
-
-    if(child_cnt > 0) {
-        uint32_t layout_id = lv_obj_get_style_layout(obj, LV_PART_MAIN);
-        if(layout_id > 0 && layout_id <= layout_cnt) {
-            void  * user_data = LV_GC_ROOT(_lv_layout_list)[layout_id - 1].user_data;
-            LV_GC_ROOT(_lv_layout_list)[layout_id - 1].cb(obj, user_data);
+        if(child_cnt > 0) {
+            uint32_t layout_id = lv_obj_get_style_layout(obj, LV_PART_MAIN);
+            if(layout_id > 0 && layout_id <= layout_cnt) {
+                void  * user_data = LV_GC_ROOT(_lv_layout_list)[layout_id - 1].user_data;
+                LV_GC_ROOT(_lv_layout_list)[layout_id - 1].cb(obj, user_data);
+            }
         }
     }
+
+    if(obj->readjust_scroll_after_layout) {
+        obj->readjust_scroll_after_layout = 0;
+        lv_obj_readjust_scroll(obj, LV_ANIM_OFF);
+    }
 }
 
 static void transform_point(const lv_obj_t * obj, lv_point_t * p, bool inv)

src/core/lv_obj_scroll.h

@@ -290,7 +290,7 @@ void lv_obj_get_scrollbar_area(struct _lv_obj_t * obj, lv_area_t * hor, lv_area_
 void lv_obj_scrollbar_invalidate(struct _lv_obj_t * obj);
 
 /**
- * Checked if the content is scrolled "in" and adjusts it to a normal position.
+ * Checks if the content is scrolled "in" and adjusts it to a normal position.
  * @param obj       pointer to an object
  * @param anim_en   LV_ANIM_ON/OFF
  */

src/core/lv_obj_style.c

@@ -496,6 +496,40 @@ lv_text_align_t lv_obj_calculate_style_text_align(const struct _lv_obj_t * obj,
     return align;
 }
 
+lv_opa_t lv_obj_get_style_opa_recursive(const lv_obj_t * obj, lv_part_t part)
+{
+
+    lv_opa_t opa_obj = lv_obj_get_style_opa(obj, part);
+    if(opa_obj <= LV_OPA_MIN) return LV_OPA_TRANSP;
+
+    lv_opa_t opa_final = LV_OPA_COVER;
+    if(opa_obj < LV_OPA_MAX) {
+        opa_final = ((uint32_t)opa_final * opa_obj) >> 8;
+    }
+
+    if(part != LV_PART_MAIN) {
+        part = LV_PART_MAIN;
+    }
+    else {
+        obj = lv_obj_get_parent(obj);
+    }
+
+    while(obj) {
+        opa_obj = lv_obj_get_style_opa(obj, part);
+        if(opa_obj <= LV_OPA_MIN) return LV_OPA_TRANSP;
+        if(opa_obj < LV_OPA_MAX) {
+            opa_final = ((uint32_t)opa_final * opa_obj) >> 8;
+        }
+
+        obj = lv_obj_get_parent(obj);
+    }
+
+    if(opa_final <= LV_OPA_MIN) return LV_OPA_TRANSP;
+    if(opa_final >= LV_OPA_MAX) return LV_OPA_COVER;
+    return opa_final;
+}
+
+
 /**********************
  *   STATIC FUNCTIONS
  **********************/
@@ -846,8 +880,7 @@ static lv_layer_type_t calculate_layer_type(lv_obj_t * obj)
 {
     if(lv_obj_get_style_transform_angle(obj, 0) != 0) return LV_LAYER_TYPE_TRANSFORM;
     if(lv_obj_get_style_transform_zoom(obj, 0) != 256) return LV_LAYER_TYPE_TRANSFORM;
-    if(lv_obj_get_style_opa(obj, 0) != LV_OPA_COVER) return LV_LAYER_TYPE_SIMPLE;
-
+    if(lv_obj_get_style_opa_layered(obj, 0) != LV_OPA_COVER) return LV_LAYER_TYPE_SIMPLE;
 #if LV_DRAW_COMPLEX
     if(lv_obj_get_style_blend_mode(obj, 0) != LV_BLEND_MODE_NORMAL) return LV_LAYER_TYPE_SIMPLE;
 #endif

src/core/lv_obj_style.h

@@ -236,6 +236,21 @@ static inline void lv_obj_set_style_size(struct _lv_obj_t * obj, lv_coord_t valu
 
 lv_text_align_t lv_obj_calculate_style_text_align(const struct _lv_obj_t * obj, lv_part_t part, const char * txt);
 
+static inline lv_coord_t lv_obj_get_style_transform_zoom_safe(const struct _lv_obj_t * obj, uint32_t part)
+{
+    int16_t zoom = lv_obj_get_style_transform_zoom(obj, part);
+    return zoom != 0 ? zoom : 1;
+}
+
+
+/**
+ * Get the `opa` style property from all parents and multiply and `>> 8` them.
+ * @param obj       the object whose opacity should be get
+ * @param part      the part whose opacity should be get. Non-MAIN parts will consider the `opa` of teh MAIN part too
+ * @return          the final opacity considering the parents' opacity too
+ */
+lv_opa_t lv_obj_get_style_opa_recursive(const struct _lv_obj_t * obj, lv_part_t part);
+
 
 /**********************
  *      MACROS

src/core/lv_obj_style_gen.c

@@ -600,6 +600,14 @@ void lv_obj_set_style_opa(struct _lv_obj_t * obj, lv_opa_t value, lv_style_selec
     lv_obj_set_local_style_prop(obj, LV_STYLE_OPA, v, selector);
 }
 
+void lv_obj_set_style_opa_layered(struct _lv_obj_t * obj, lv_opa_t value, lv_style_selector_t selector)
+{
+    lv_style_value_t v = {
+        .num = (int32_t)value
+    };
+    lv_obj_set_local_style_prop(obj, LV_STYLE_OPA_LAYERED, v, selector);
+}
+
 void lv_obj_set_style_color_filter_dsc(struct _lv_obj_t * obj, const lv_color_filter_dsc_t * value, lv_style_selector_t selector)
 {
     lv_style_value_t v = {

src/core/lv_obj_style_gen.h

@@ -508,6 +508,12 @@ static inline lv_opa_t lv_obj_get_style_opa(const struct _lv_obj_t * obj, uint32
     return (lv_opa_t)v.num;
 }
 
+static inline lv_opa_t lv_obj_get_style_opa_layered(const struct _lv_obj_t * obj, uint32_t part)
+{
+    lv_style_value_t v = lv_obj_get_style_prop(obj, part, LV_STYLE_OPA_LAYERED);
+    return (lv_opa_t)v.num;
+}
+
 static inline const lv_color_filter_dsc_t * lv_obj_get_style_color_filter_dsc(const struct _lv_obj_t * obj, uint32_t part)
 {
     lv_style_value_t v = lv_obj_get_style_prop(obj, part, LV_STYLE_COLOR_FILTER_DSC);
@@ -637,6 +643,7 @@ void lv_obj_set_style_text_align(struct _lv_obj_t * obj, lv_text_align_t value,
 void lv_obj_set_style_radius(struct _lv_obj_t * obj, lv_coord_t value, lv_style_selector_t selector);
 void lv_obj_set_style_clip_corner(struct _lv_obj_t * obj, bool value, lv_style_selector_t selector);
 void lv_obj_set_style_opa(struct _lv_obj_t * obj, lv_opa_t value, lv_style_selector_t selector);
+void lv_obj_set_style_opa_layered(struct _lv_obj_t * obj, lv_opa_t value, lv_style_selector_t selector);
 void lv_obj_set_style_color_filter_dsc(struct _lv_obj_t * obj, const lv_color_filter_dsc_t * value, lv_style_selector_t selector);
 void lv_obj_set_style_color_filter_opa(struct _lv_obj_t * obj, lv_opa_t value, lv_style_selector_t selector);
 void lv_obj_set_style_anim(struct _lv_obj_t * obj, const lv_anim_t * value, lv_style_selector_t selector);

src/core/lv_obj_tree.c

@@ -49,9 +49,6 @@ void lv_obj_del(lv_obj_t * obj)
     lv_obj_invalidate(obj);
 
     lv_obj_t * par = lv_obj_get_parent(obj);
-    if(par) {
-        lv_obj_scrollbar_invalidate(par);
-    }
 
     lv_disp_t * disp = NULL;
     bool act_scr_del = false;
@@ -65,8 +62,6 @@ void lv_obj_del(lv_obj_t * obj)
 
     /*Call the ancestor's event handler to the parent to notify it about the child delete*/
     if(par) {
-        lv_obj_update_layout(par);
-        lv_obj_readjust_scroll(par, LV_ANIM_OFF);
         lv_obj_scrollbar_invalidate(par);
         lv_event_send(par, LV_EVENT_CHILD_CHANGED, NULL);
         lv_event_send(par, LV_EVENT_CHILD_DELETED, NULL);
@@ -173,7 +168,6 @@ void lv_obj_set_parent(lv_obj_t * obj, lv_obj_t * parent)
     obj->parent = parent;
 
     /*Notify the original parent because one of its children is lost*/
-    lv_obj_readjust_scroll(old_parent, LV_ANIM_OFF);
     lv_obj_scrollbar_invalidate(old_parent);
     lv_event_send(old_parent, LV_EVENT_CHILD_CHANGED, obj);
     lv_event_send(old_parent, LV_EVENT_CHILD_DELETED, NULL);

src/core/lv_refr.c

@@ -53,6 +53,7 @@ typedef struct {
  **********************/
 static void lv_refr_join_area(void);
 static void refr_invalid_areas(void);
+static void refr_sync_areas(void);
 static void refr_area(const lv_area_t * area_p);
 static void refr_area_part(lv_draw_ctx_t * draw_ctx);
 static lv_obj_t * lv_refr_get_top_obj(const lv_area_t * area_p, lv_obj_t * obj);
@@ -320,12 +321,25 @@ void _lv_disp_refr_timer(lv_timer_t * tmr)
     }
 
     lv_refr_join_area();
-
+    refr_sync_areas();
     refr_invalid_areas();
 
     /*If refresh happened ...*/
     if(disp_refr->inv_p != 0) {
 
+        /*Copy invalid areas for sync next refresh in double buffered direct mode*/
+        if(disp_refr->driver->direct_mode && disp_refr->driver->draw_buf->buf2) {
+
+            uint16_t i;
+            for(i = 0; i < disp_refr->inv_p; i++) {
+                if(disp_refr->inv_area_joined[i])
+                    continue;
+
+                lv_area_t * sync_area = _lv_ll_ins_tail(&disp_refr->sync_areas);
+                *sync_area = disp_refr->inv_areas[i];
+            }
+        }
+
         /*Clean up*/
         lv_memset_00(disp_refr->inv_areas, sizeof(disp_refr->inv_areas));
         lv_memset_00(disp_refr->inv_area_joined, sizeof(disp_refr->inv_area_joined));
@@ -495,6 +509,78 @@ static void lv_refr_join_area(void)
     }
 }
 
+/**
+ * Refresh the sync areas
+ */
+static void refr_sync_areas(void)
+{
+    /*Do not sync if not direct mode*/
+    if(!disp_refr->driver->direct_mode) return;
+
+    /*Do not sync if not double buffered*/
+    if(disp_refr->driver->draw_buf->buf2 == NULL) return;
+
+    /*Do not sync if no sync areas*/
+    if(_lv_ll_is_empty(&disp_refr->sync_areas)) return;
+
+    /*The buffers are already swapped.
+     *So the active buffer is the off screen buffer where LVGL will render*/
+    void * buf_off_screen = disp_refr->driver->draw_buf->buf_act;
+    void * buf_on_screen = disp_refr->driver->draw_buf->buf_act == disp_refr->driver->draw_buf->buf1
+                           ? disp_refr->driver->draw_buf->buf2
+                           : disp_refr->driver->draw_buf->buf1;
+
+    /*Get stride for buffer copy*/
+    lv_coord_t stride = lv_disp_get_hor_res(disp_refr);
+
+    /*Iterate through invalidated areas to see if sync area should be copied*/
+    lv_area_t res[4] = {0};
+    int8_t res_c, j;
+    uint32_t i;
+    lv_area_t * sync_area, *new_area, *next_area;
+    for(i = 0; i < disp_refr->inv_p; i++) {
+        /*Skip joined areas*/
+        if(disp_refr->inv_area_joined[i]) continue;
+
+        /*Iterate over sync areas*/
+        sync_area = _lv_ll_get_head(&disp_refr->sync_areas);
+        while(sync_area != NULL) {
+            /*Get next sync area*/
+            next_area = _lv_ll_get_next(&disp_refr->sync_areas, sync_area);
+
+            /*Remove intersect of redraw area from sync area and get remaining areas*/
+            res_c = _lv_area_diff(res, sync_area, &disp_refr->inv_areas[i]);
+
+            /*New sub areas created after removing intersect*/
+            if(res_c != -1) {
+                /*Replace old sync area with new areas*/
+                for(j = 0; j < res_c; j++) {
+                    new_area = _lv_ll_ins_prev(&disp_refr->sync_areas, sync_area);
+                    *new_area = res[j];
+                }
+                _lv_ll_remove(&disp_refr->sync_areas, sync_area);
+                lv_mem_free(sync_area);
+            }
+
+            /*Move on to next sync area*/
+            sync_area = next_area;
+        }
+    }
+
+    /*Copy sync areas (if any remaining)*/
+    for(sync_area = _lv_ll_get_head(&disp_refr->sync_areas); sync_area != NULL;
+        sync_area = _lv_ll_get_next(&disp_refr->sync_areas, sync_area)) {
+        disp_refr->driver->draw_ctx->buffer_copy(
+            disp_refr->driver->draw_ctx,
+            buf_off_screen, stride, sync_area,
+            buf_on_screen, stride, sync_area
+        );
+    }
+
+    /*Clear sync areas*/
+    _lv_ll_clear(&disp_refr->sync_areas);
+}
+
 /**
  * Refresh the joined areas
  */
@@ -888,7 +974,7 @@ void refr_obj(lv_draw_ctx_t * draw_ctx, lv_obj_t * obj)
         lv_obj_redraw(draw_ctx, obj);
     }
     else {
-        lv_opa_t opa = lv_obj_get_style_opa(obj, 0);
+        lv_opa_t opa = lv_obj_get_style_opa_layered(obj, 0);
         if(opa < LV_OPA_MIN) return;
 
         lv_area_t layer_area_full;

src/draw/nxp/vglite/lv_draw_vglite_arc.c

@@ -595,6 +595,8 @@ static void add_split_arc_path(int32_t * arc_path, int * pidx, vg_arc * q_arc, c
 static void add_arc_path(int32_t * arc_path, int * pidx, int32_t radius,
                          int32_t start_angle, int32_t end_angle, const lv_point_t * center, bool cw)
 {
+    if(end_angle < start_angle) end_angle += 360;
+
     /* set number of arcs to draw */
     vg_arc q_arc;
     int32_t start_arc_angle = start_angle % 90;

src/draw/sdl/lv_draw_sdl_composite.c

@@ -101,7 +101,8 @@ bool lv_draw_sdl_composite_begin(lv_draw_sdl_ctx_t * ctx, const lv_area_t * coor
         SDL_RenderFillRect(ctx->renderer, NULL);
         SDL_SetRenderDrawBlendMode(ctx->renderer, SDL_BLENDMODE_BLEND);
 #if LV_GPU_SDL_CUSTOM_BLEND_MODE
-        internals->mask = lv_draw_sdl_composite_texture_obtain(ctx, LV_DRAW_SDL_COMPOSITE_TEXTURE_ID_STREAM0, w, h);
+        internals->mask = lv_draw_sdl_composite_texture_obtain(ctx, LV_DRAW_SDL_COMPOSITE_TEXTURE_ID_STREAM0, w, h,
+                                                               &internals->composition_cached);
         dump_masks(internals->mask, apply_area);
 #endif
     }

src/draw/stm32_dma2d/lv_gpu_stm32_dma2d.c

@@ -34,6 +34,19 @@
     #error "Cannot use DMA2D with LV_COLOR_DEPTH other than 16 or 32"
 #endif
 
+#if defined (__DCACHE_PRESENT) && (__DCACHE_PRESENT == 1U)
+    #define LV_STM32_DMA2D_USE_M7_CACHE
+#endif
+
+#if defined (LV_STM32_DMA2D_USE_M7_CACHE)
+    // Cortex-M7 DCache present
+    #define __lv_gpu_stm32_dma2d_clean_cache(address, offset, width, height, pixel_size) _lv_gpu_stm32_dma2d_clean_cache(address, offset, width, height, pixel_size)
+    #define __lv_gpu_stm32_dma2d_invalidate_cache(address, offset, width, height, pixel_size) _lv_gpu_stm32_dma2d_invalidate_cache(address, offset, width, height, pixel_size)
+#else
+    #define __lv_gpu_stm32_dma2d_clean_cache(address, offset, width, height, pixel_size)
+    #define __lv_gpu_stm32_dma2d_invalidate_cache(address, offset, width, height, pixel_size)
+#endif
+
 /**********************
  *  STATIC PROTOTYPES
  **********************/
@@ -61,13 +74,19 @@ LV_STM32_DMA2D_STATIC void _lv_draw_stm32_dma2d_copy_buffer(const lv_color_t * d
                                                             const lv_area_t * draw_area, const lv_color_t * src_buf, lv_coord_t src_stride, const lv_point_t * src_offset);
 LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dma2d_await_dma_transfer_finish(lv_disp_drv_t * disp_drv);
 LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dma2d_start_dma_transfer(void);
+
+#if defined (LV_STM32_DMA2D_USE_M7_CACHE)
 LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dma2d_invalidate_cache(uint32_t address, lv_coord_t offset,
                                                                 lv_coord_t width, lv_coord_t height, uint8_t pixel_size);
 LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dma2d_clean_cache(uint32_t address, lv_coord_t offset, lv_coord_t width,
                                                            lv_coord_t height, uint8_t pixel_size);
-LV_STM32_DMA2D_STATIC bool _lv_gpu_stm32_dwt_init(void);
-LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dwt_reset(void);
-LV_STM32_DMA2D_STATIC uint32_t _lv_gpu_stm32_dwt_get_us(void);
+#endif
+
+#if defined(LV_STM32_DMA2D_TEST)
+    LV_STM32_DMA2D_STATIC bool _lv_gpu_stm32_dwt_init(void);
+    LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dwt_reset(void);
+    LV_STM32_DMA2D_STATIC uint32_t _lv_gpu_stm32_dwt_get_us(void);
+#endif
 
 static bool isDma2dInProgess = false; // indicates whether DMA2D transfer *initiated here* is in progress
 
@@ -77,21 +96,21 @@ static bool isDma2dInProgess = false; // indicates whether DMA2D transfer *initi
 void lv_draw_stm32_dma2d_init(void)
 {
     // Enable DMA2D clock
-#if defined(STM32F4) || defined(STM32F7)
+#if defined(STM32F4) || defined(STM32F7) || defined(STM32U5)
     RCC->AHB1ENR |= RCC_AHB1ENR_DMA2DEN; // enable DMA2D
+    // wait for hardware access to complete
+    __asm volatile("DSB\n");
+    volatile uint32_t temp = RCC->AHB1ENR;
+    LV_UNUSED(temp);
 #elif defined(STM32H7)
     RCC->AHB3ENR |= RCC_AHB3ENR_DMA2DEN;
+    // wait for hardware access to complete
+    __asm volatile("DSB\n");
+    volatile uint32_t temp = RCC->AHB3ENR;
+    LV_UNUSED(temp);
 #else
 # warning "LVGL can't enable the clock of DMA2D"
 #endif
-
-    // Wait for hardware access to complete
-    __asm volatile("DSB\n");
-
-    // Delay after setting peripheral clock
-    volatile uint32_t temp = RCC->AHB1ENR;
-    LV_UNUSED(temp);
-
     // AHB master timer configuration
     DMA2D->AMTCR = 0; // AHB bus guaranteed dead time disabled
 #if defined(LV_STM32_DMA2D_TEST)
@@ -206,7 +225,7 @@ static void lv_draw_stm32_dma2d_blend(lv_draw_ctx_t * draw_ctx, const lv_draw_sw
             // lv_coord_t draw_width = lv_area_get_width(&draw_area);
             // lv_coord_t draw_height = lv_area_get_height(&draw_area);
             // uint32_t dest_address = (uint32_t)(draw_ctx->buf + (dest_stride * draw_area.y1) + draw_area.x1);
-            // _lv_gpu_stm32_dma2d_clean_cache(dest_address, dest_stride - draw_width, draw_width, draw_height, sizeof(lv_color_t));
+            // __lv_gpu_stm32_dma2d_clean_cache(dest_address, dest_stride - draw_width, draw_width, draw_height, sizeof(lv_color_t));
 #endif
         }
     }
@@ -412,7 +431,7 @@ LV_STM32_DMA2D_STATIC void _lv_draw_stm32_dma2d_blend_fill(const lv_color_t * de
         DMA2D->BGMAR = (uint32_t)(dest_buf + (dest_stride * draw_area->y1) + draw_area->x1);
         DMA2D->BGOR = dest_stride - draw_width;
         DMA2D->BGCOLR = 0;  // used in A4 and A8 modes only
-        _lv_gpu_stm32_dma2d_clean_cache(DMA2D->BGMAR, DMA2D->BGOR, draw_width, draw_height, sizeof(lv_color_t));
+        __lv_gpu_stm32_dma2d_clean_cache(DMA2D->BGMAR, DMA2D->BGOR, draw_width, draw_height, sizeof(lv_color_t));
 
         DMA2D->OPFCCR = LvglColorFormat;
 #if defined(DMA2D_OPFCCR_RBS_Pos)
@@ -500,7 +519,7 @@ LV_STM32_DMA2D_STATIC void _lv_draw_stm32_dma2d_blend_map(const lv_color_t * des
     DMA2D->FGMAR = ((uint32_t)src_buf) + srcBpp * ((src_stride * src_offset->y) + src_offset->x);
     DMA2D->FGOR = src_stride - draw_width;
     DMA2D->FGCOLR = 0;  // used in A4 and A8 modes only
-    _lv_gpu_stm32_dma2d_clean_cache(DMA2D->FGMAR, DMA2D->FGOR, draw_width, draw_height, srcBpp);
+    __lv_gpu_stm32_dma2d_clean_cache(DMA2D->FGMAR, DMA2D->FGOR, draw_width, draw_height, srcBpp);
 
     DMA2D->OPFCCR = LvglColorFormat;
 #if defined(DMA2D_OPFCCR_RBS_Pos)
@@ -519,7 +538,7 @@ LV_STM32_DMA2D_STATIC void _lv_draw_stm32_dma2d_blend_map(const lv_color_t * des
         DMA2D->BGMAR = DMA2D->OMAR;
         DMA2D->BGOR = DMA2D->OOR;
         DMA2D->BGCOLR = 0;  // used in A4 and A8 modes only
-        _lv_gpu_stm32_dma2d_clean_cache(DMA2D->BGMAR, DMA2D->BGOR, draw_width, draw_height, sizeof(lv_color_t));
+        __lv_gpu_stm32_dma2d_clean_cache(DMA2D->BGMAR, DMA2D->BGOR, draw_width, draw_height, sizeof(lv_color_t));
     }
 
     // PL - pixel per lines (14 bit), NL - number of lines (16 bit)
@@ -556,7 +575,7 @@ LV_STM32_DMA2D_STATIC void _lv_draw_stm32_dma2d_blend_paint(const lv_color_t * d
     DMA2D->FGMAR = (uint32_t)(mask_buf + (mask_stride * mask_offset->y) + mask_offset->x);
     DMA2D->FGOR = mask_stride - draw_width;
     DMA2D->FGCOLR = lv_color_to32(color) & 0x00ffffff;  // swap FGCOLR R/B bits if FGPFCCR.RBS (RBS_BIT) bit is set
-    _lv_gpu_stm32_dma2d_clean_cache(DMA2D->FGMAR, DMA2D->FGOR, draw_width, draw_height, sizeof(lv_opa_t));
+    __lv_gpu_stm32_dma2d_clean_cache(DMA2D->FGMAR, DMA2D->FGOR, draw_width, draw_height, sizeof(lv_opa_t));
 
     DMA2D->BGPFCCR = LvglColorFormat;
 #if defined(DMA2D_BGPFCCR_RBS_Pos)
@@ -565,7 +584,7 @@ LV_STM32_DMA2D_STATIC void _lv_draw_stm32_dma2d_blend_paint(const lv_color_t * d
     DMA2D->BGMAR = (uint32_t)(dest_buf + (dest_stride * draw_area->y1) + draw_area->x1);
     DMA2D->BGOR = dest_stride - draw_width;
     DMA2D->BGCOLR = 0;  // used in A4 and A8 modes only
-    _lv_gpu_stm32_dma2d_clean_cache(DMA2D->BGMAR, DMA2D->BGOR, draw_width, draw_height, sizeof(lv_color_t));
+    __lv_gpu_stm32_dma2d_clean_cache(DMA2D->BGMAR, DMA2D->BGOR, draw_width, draw_height, sizeof(lv_color_t));
 
     DMA2D->OPFCCR = LvglColorFormat;
 #if defined(DMA2D_OPFCCR_RBS_Pos)
@@ -602,7 +621,7 @@ LV_STM32_DMA2D_STATIC void _lv_draw_stm32_dma2d_copy_buffer(const lv_color_t * d
     DMA2D->FGMAR = (uint32_t)(src_buf + (src_stride * src_offset->y) + src_offset->x);
     DMA2D->FGOR = src_stride - draw_width;
     DMA2D->FGCOLR = 0;  // used in A4 and A8 modes only
-    _lv_gpu_stm32_dma2d_clean_cache(DMA2D->FGMAR, DMA2D->FGOR, draw_width, draw_height, sizeof(lv_color_t));
+    __lv_gpu_stm32_dma2d_clean_cache(DMA2D->FGMAR, DMA2D->FGOR, draw_width, draw_height, sizeof(lv_color_t));
 
     // Note BG* registers do not need to be set up since BG is not used
 
@@ -627,8 +646,8 @@ LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dma2d_start_dma_transfer(void)
     DMA2D->IFCR = 0x3FU; // trigger ISR flags reset
     // Note: cleaning output buffer cache is needed only when buffer may be misaligned or adjacent area may have been drawn in sw-fashion, e.g. using lv_draw_sw_blend_basic()
 #if LV_COLOR_DEPTH == 16
-    _lv_gpu_stm32_dma2d_clean_cache(DMA2D->OMAR, DMA2D->OOR, (DMA2D->NLR & DMA2D_NLR_PL_Msk) >> DMA2D_NLR_PL_Pos,
-                                    (DMA2D->NLR & DMA2D_NLR_NL_Msk) >> DMA2D_NLR_NL_Pos, sizeof(lv_color_t));
+    __lv_gpu_stm32_dma2d_clean_cache(DMA2D->OMAR, DMA2D->OOR, (DMA2D->NLR & DMA2D_NLR_PL_Msk) >> DMA2D_NLR_PL_Pos,
+                                     (DMA2D->NLR & DMA2D_NLR_NL_Msk) >> DMA2D_NLR_NL_Pos, sizeof(lv_color_t));
 #endif
     DMA2D->CR |= DMA2D_CR_START;
     // Note: for some reason mask buffer gets damaged during transfer if waiting is postponed
@@ -660,15 +679,16 @@ LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dma2d_await_dma_transfer_finish(lv_disp
 
     if(isDma2dInProgess) {
         // invalidate output buffer cached memory ONLY after DMA2D transfer
-        //_lv_gpu_stm32_dma2d_invalidate_cache(DMA2D->OMAR, DMA2D->OOR, (DMA2D->NLR & DMA2D_NLR_PL_Msk) >> DMA2D_NLR_PL_Pos, (DMA2D->NLR & DMA2D_NLR_NL_Msk) >> DMA2D_NLR_NL_Pos, sizeof(lv_color_t));
+        //__lv_gpu_stm32_dma2d_invalidate_cache(DMA2D->OMAR, DMA2D->OOR, (DMA2D->NLR & DMA2D_NLR_PL_Msk) >> DMA2D_NLR_PL_Pos, (DMA2D->NLR & DMA2D_NLR_NL_Msk) >> DMA2D_NLR_NL_Pos, sizeof(lv_color_t));
         isDma2dInProgess = false;
     }
 }
 
+#if defined (LV_STM32_DMA2D_USE_M7_CACHE)
+// Cortex-M7 DCache present
 LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dma2d_invalidate_cache(uint32_t address, lv_coord_t offset, lv_coord_t width,
                                                                 lv_coord_t height, uint8_t pixel_size)
 {
-#if defined (__DCACHE_PRESENT) && (__DCACHE_PRESENT == 1U)
     if(((SCB->CCR) & SCB_CCR_DC_Msk) == 0) return; // L1 data cache is disabled
     uint16_t stride = pixel_size * (width + offset); // in bytes
     uint16_t ll = pixel_size * width; // line length in bytes
@@ -694,13 +714,11 @@ LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dma2d_invalidate_cache(uint32_t address
 
     __DSB();
     __ISB();
-#endif
 }
 
 LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dma2d_clean_cache(uint32_t address, lv_coord_t offset, lv_coord_t width,
                                                            lv_coord_t height, uint8_t pixel_size)
 {
-#if defined (__DCACHE_PRESENT) && (__DCACHE_PRESENT == 1U)
     if(((SCB->CCR) & SCB_CCR_DC_Msk) == 0) return; // L1 data cache is disabled
     uint16_t stride = pixel_size * (width + offset); // in bytes
     uint16_t ll = pixel_size * width; // line length in bytes
@@ -725,9 +743,10 @@ LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dma2d_clean_cache(uint32_t address, lv_
 
     __DSB();
     __ISB();
-#endif
 }
+#endif // LV_STM32_DMA2D_USE_M7_CACHE
 
+#if defined(LV_STM32_DMA2D_TEST)
 // initialize µs timer
 LV_STM32_DMA2D_STATIC bool _lv_gpu_stm32_dwt_init(void)
 {
@@ -773,5 +792,5 @@ LV_STM32_DMA2D_STATIC void _lv_gpu_stm32_dwt_reset(void)
 {
     DWT->CYCCNT = 0;
 }
-
-#endif
+#endif // LV_STM32_DMA2D_TEST
+#endif // LV_USE_GPU_STM32_DMA2D

src/draw/sw/lv_draw_sw_letter.c

@@ -103,7 +103,7 @@ void lv_draw_sw_letter(lv_draw_ctx_t * draw_ctx, const lv_draw_label_dsc_t * dsc
         if(letter >= 0x20 &&
            letter != 0xf8ff && /*LV_SYMBOL_DUMMY*/
            letter != 0x200c) { /*ZERO WIDTH NON-JOINER*/
-            LV_LOG_WARN("lv_draw_letter: glyph dsc. not found for U+%" PRIX32, letter);
+            LV_LOG_WARN("lv_draw_letter: glyph dsc. not found for U+%" LV_PRIX32, letter);
 
 #if LV_USE_FONT_PLACEHOLDER
             /* draw placeholder */

src/draw/sw/lv_draw_sw_transform.c

@@ -273,7 +273,7 @@ static void argb_and_rgb_aa(const uint8_t * src, lv_coord_t src_w, lv_coord_t sr
     int32_t ys_ups_start = ys_ups;
     bool has_alpha;
     int32_t px_size;
-    lv_color_t ck = {0};
+    lv_color_t ck = _LV_COLOR_ZERO_INITIALIZER;
     switch(cf) {
         case LV_IMG_CF_TRUE_COLOR:
             has_alpha = false;

src/extra/libs/fsdrv/lv_fs_littlefs.c

@@ -0,0 +1,332 @@
+/**
+ * @file lv_fs_littlefs.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "../../../lvgl.h"
+
+#if LV_USE_FS_LITTLEFS
+#include "lfs.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+#if LV_FS_LITTLEFS_LETTER == '\0'
+    #error "LV_FS_LITTLEFS_LETTER must be an upper case ASCII letter"
+#endif
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+static void fs_init(void);
+
+static void * fs_open(lv_fs_drv_t * drv, const char * path, lv_fs_mode_t mode);
+static lv_fs_res_t fs_close(lv_fs_drv_t * drv, void * file_p);
+
+static lv_fs_res_t fs_read(lv_fs_drv_t * drv, void * file_p, void * buf, uint32_t btr, uint32_t * br);
+static lv_fs_res_t fs_write(lv_fs_drv_t * drv, void * file_p, const void * buf, uint32_t btw, uint32_t * bw);
+
+static lv_fs_res_t fs_seek(lv_fs_drv_t * drv, void * file_p, uint32_t pos, lv_fs_whence_t whence);
+static lv_fs_res_t fs_tell(lv_fs_drv_t * drv, void * file_p, uint32_t * pos_p);
+
+static void * fs_dir_open(lv_fs_drv_t * drv, const char * path);
+static lv_fs_res_t fs_dir_read(lv_fs_drv_t * drv, void * dir_p, char * fn);
+static lv_fs_res_t fs_dir_close(lv_fs_drv_t * drv, void * dir_p);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+void lv_fs_littlefs_init(void)
+{
+    /*----------------------------------------------------
+     * Initialize your storage device and File System
+     * -------------------------------------------------*/
+    fs_init();
+
+    /*---------------------------------------------------
+     * Register the file system interface in LVGL
+     *--------------------------------------------------*/
+
+    /*Add a simple drive to open images*/
+    static lv_fs_drv_t fs_drv; /*A driver descriptor*/
+    lv_fs_drv_init(&fs_drv);
+
+    /*Set up fields...*/
+    fs_drv.letter = LV_FS_LITTLEFS_LETTER;
+    fs_drv.cache_size = LV_FS_LITTLEFS_CACHE_SIZE;
+
+    fs_drv.open_cb = fs_open;
+    fs_drv.close_cb = fs_close;
+    fs_drv.read_cb = fs_read;
+    fs_drv.write_cb = fs_write;
+    fs_drv.seek_cb = fs_seek;
+    fs_drv.tell_cb = fs_tell;
+
+    fs_drv.dir_open_cb = fs_dir_open;
+    fs_drv.dir_close_cb = fs_dir_close;
+    fs_drv.dir_read_cb = fs_dir_read;
+
+    /*#if LV_USE_USER_DATA*/
+    fs_drv.user_data = NULL;
+    /*#endif*/
+
+    lv_fs_drv_register(&fs_drv);
+}
+
+/**
+ * Convenience function to attach registered driver to lfs_t structure by driver-label
+ * @param label     the label assigned to the driver when it was registered
+ * @param lfs_p     the pointer to the lfs_t structure initialized by external code/library
+ * @return          pointer to a driver descriptor or NULL on error
+ */
+lv_fs_drv_t * lv_fs_littlefs_set_driver(char label, void * lfs_p)
+{
+    lv_fs_drv_t * drv_p = lv_fs_get_drv(label);
+    if(drv_p != NULL) drv_p->user_data = (lfs_t *) lfs_p;
+    return drv_p;
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+/*Initialize your Storage device and File system.*/
+static void fs_init(void)
+{
+    /* Initialize the internal flash or SD-card and LittleFS itself.
+     * Better to do it in your code to keep this library untouched for easy updating */
+}
+
+/**
+ * Open a file
+ * @param drv       pointer to a driver where this function belongs
+ * @param path      path to the file beginning with the driver letter (e.g. S:/folder/file.txt)
+ * @param mode      read: FS_MODE_RD, write: FS_MODE_WR, both: FS_MODE_RD | FS_MODE_WR
+ * @return          pointer to a file descriptor or NULL on error
+ */
+static void * fs_open(lv_fs_drv_t * drv, const char * path, lv_fs_mode_t mode)
+{
+    lfs_t * lfs_p = drv->user_data;
+    uint32_t flags = 0;
+
+    flags = mode == LV_FS_MODE_RD ? LFS_O_RDONLY
+            : mode == LV_FS_MODE_WR ? LFS_O_WRONLY
+            : mode == (LV_FS_MODE_WR | LV_FS_MODE_RD) ? LFS_O_RDWR : 0;
+
+    lfs_file_t * file_p = lv_mem_alloc(sizeof(lfs_file_t));
+    if(file_p == NULL) return NULL;
+
+    int result = lfs_file_open(lfs_p, file_p, path, flags);
+
+    if(result != LFS_ERR_OK) {
+        lv_mem_free(file_p);
+        return NULL;
+    }
+
+    return file_p;
+}
+
+/**
+ * Close an opened file
+ * @param drv       pointer to a driver where this function belongs
+ * @param file_p    pointer to a file_t variable. (opened with fs_open)
+ * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
+ */
+static lv_fs_res_t fs_close(lv_fs_drv_t * drv, void * file_p)
+{
+    lfs_t * lfs_p = drv->user_data;
+
+    int result = lfs_file_close(lfs_p, file_p);
+    lv_mem_free(file_p);
+    /*lv_mem_free( lfs_p );*/ /*allocated and freed by outside-code*/
+
+    if(result != LFS_ERR_OK) return LV_FS_RES_UNKNOWN;
+    return LV_FS_RES_OK;
+}
+
+/**
+ * Read data from an opened file
+ * @param drv       pointer to a driver where this function belongs
+ * @param file_p    pointer to a file_t variable.
+ * @param buf       pointer to a memory block where to store the read data
+ * @param btr       number of Bytes To Read
+ * @param br        the real number of read bytes (Byte Read)
+ * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
+ */
+static lv_fs_res_t fs_read(lv_fs_drv_t * drv, void * file_p, void * buf, uint32_t btr, uint32_t * br)
+{
+    lfs_t * lfs_p = drv->user_data;
+
+    lfs_ssize_t result = lfs_file_read(lfs_p, file_p, buf, btr);
+    if(result < 0) return LV_FS_RES_UNKNOWN;
+
+    *br = (uint32_t) result;
+    return LV_FS_RES_OK;
+}
+
+/**
+ * Write into a file
+ * @param drv       pointer to a driver where this function belongs
+ * @param file_p    pointer to a file_t variable
+ * @param buf       pointer to a buffer with the bytes to write
+ * @param btw       Bytes To Write
+ * @param bw        the number of real written bytes (Bytes Written). NULL if unused.
+ * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
+ */
+static lv_fs_res_t fs_write(lv_fs_drv_t * drv, void * file_p, const void * buf, uint32_t btw, uint32_t * bw)
+{
+#ifndef LFS_READONLY
+    lfs_t * lfs_p = drv->user_data;
+
+    lfs_ssize_t result = lfs_file_write(lfs_p, file_p, buf, btw);
+    if(result < 0 || lfs_file_sync(lfs_p, file_p) < 0) return LV_FS_RES_UNKNOWN;
+
+    *bw = (uint32_t) result;
+    return LV_FS_RES_OK;
+#else
+    return LV_FS_RES_NOT_IMP;
+#endif
+}
+
+/**
+ * Set the read write pointer. Also expand the file size if necessary.
+ * @param drv       pointer to a driver where this function belongs
+ * @param file_p    pointer to a file_t variable. (opened with fs_open )
+ * @param pos       the new position of read write pointer
+ * @param whence    tells from where to interpret the `pos`. See @lv_fs_whence_t
+ * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
+ */
+static lv_fs_res_t fs_seek(lv_fs_drv_t * drv, void * file_p, uint32_t pos, lv_fs_whence_t whence)
+{
+    lfs_t * lfs_p = drv->user_data;
+
+    int lfs_whence = whence == LV_FS_SEEK_SET ? LFS_SEEK_SET
+                     : whence == LV_FS_SEEK_CUR ? LFS_SEEK_CUR
+                     : whence == LV_FS_SEEK_END ? LFS_SEEK_END : 0;
+
+    lfs_soff_t result = lfs_file_seek(lfs_p, file_p, pos, lfs_whence);
+    if(result < 0) return LV_FS_RES_UNKNOWN;
+
+    /*pos = result;*/ /*not supported by lv_fs*/
+    return LV_FS_RES_OK;
+}
+
+/**
+ * Give the position of the read write pointer
+ * @param drv       pointer to a driver where this function belongs
+ * @param file_p    pointer to a file_t variable.
+ * @param pos_p     pointer to where to store the result
+ * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
+ */
+static lv_fs_res_t fs_tell(lv_fs_drv_t * drv, void * file_p, uint32_t * pos_p)
+{
+    lfs_t * lfs_p = drv->user_data;
+
+    lfs_soff_t result = lfs_file_tell(lfs_p, file_p);
+    if(result < 0) return LV_FS_RES_UNKNOWN;
+
+    *pos_p = (uint32_t) result;
+    return LV_FS_RES_OK;
+}
+
+/**
+ * Initialize a 'lv_fs_dir_t' variable for directory reading
+ * @param drv       pointer to a driver where this function belongs
+ * @param path      path to a directory
+ * @return          pointer to the directory read descriptor or NULL on error
+ */
+static void * fs_dir_open(lv_fs_drv_t * drv, const char * path)
+{
+    lfs_t * lfs_p = drv->user_data;
+
+    lfs_dir_t * dir_p = lv_mem_alloc(sizeof(lfs_dir_t));
+    if(dir_p == NULL) return NULL;
+
+    int result = lfs_dir_open(lfs_p, dir_p, path);
+    if(result != LFS_ERR_OK) {
+        lv_mem_free(dir_p);
+        return NULL;
+    }
+
+    return dir_p;
+}
+
+/**
+ * Read the next filename form a directory.
+ * The name of the directories will begin with '/'
+ * @param drv       pointer to a driver where this function belongs
+ * @param rddir_p   pointer to an initialized 'lv_fs_dir_t' variable
+ * @param fn        pointer to a buffer to store the filename
+ * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
+ */
+static lv_fs_res_t fs_dir_read(lv_fs_drv_t * drv, void * rddir_p, char * fn)
+{
+    lfs_t * lfs_p = drv->user_data;
+    struct lfs_info info;
+    int result;
+
+    info.name[0] = '\0';
+
+    do {
+        result = lfs_dir_read(lfs_p, rddir_p, &info);
+        if(result > 0) {
+            if(info.type == LFS_TYPE_DIR) {
+                fn[0] = '/';
+                strcpy(&fn[1], info.name);
+            }
+            else strcpy(fn, info.name);
+        }
+        else if(result == 0) fn[0] = '\0'; /*dir-scan ended*/
+        else return LV_FS_RES_UNKNOWN;
+
+    } while(!strcmp(fn, "/.") || !strcmp(fn, "/.."));
+
+    return LV_FS_RES_OK;
+}
+
+/**
+ * Close the directory reading
+ * @param drv       pointer to a driver where this function belongs
+ * @param rddir_p   pointer to an initialized 'lv_fs_dir_t' variable
+ * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
+ */
+static lv_fs_res_t fs_dir_close(lv_fs_drv_t * drv, void * rddir_p)
+{
+    lfs_t * lfs_p = drv->user_data;
+
+    int result = lfs_dir_close(lfs_p, rddir_p);
+    lv_mem_free(rddir_p);
+
+    if(result != LFS_ERR_OK) return LV_FS_RES_UNKNOWN;
+    return LV_FS_RES_OK;
+}
+
+#else /*LV_USE_FS_LITTLEFS == 0*/
+
+#if defined(LV_FS_LITTLEFS_LETTER) && LV_FS_LITTLEFS_LETTER != '\0'
+    #warning "LV_USE_FS_LITTLEFS is not enabled but LV_FS_LITTLEFS_LETTER is set"
+#endif
+
+#endif /*LV_USE_FS_POSIX*/

src/extra/libs/fsdrv/lv_fsdrv.h

@@ -31,6 +31,11 @@ extern "C" {
 void lv_fs_fatfs_init(void);
 #endif
 
+#if LV_USE_FS_LITTLEFS != '\0'
+void lv_fs_littlefs_init(void);
+lv_fs_drv_t * lv_fs_littlefs_set_driver(char label, void * lfs_p);
+#endif
+
 #if LV_USE_FS_STDIO != '\0'
 void lv_fs_stdio_init(void);
 #endif

src/extra/libs/lv_libs.h

@@ -22,6 +22,7 @@ extern "C" {
 #include "freetype/lv_freetype.h"
 #include "rlottie/lv_rlottie.h"
 #include "ffmpeg/lv_ffmpeg.h"
+#include "tiny_ttf/lv_tiny_ttf.h"
 
 /*********************
  *      DEFINES

src/extra/libs/qrcode/qrcodegen.c

@@ -21,11 +21,11 @@
  *   Software.
  */
 
-#include <assert.h>
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
 #include "qrcodegen.h"
+#include "../../../misc/lv_assert.h"
 
 #ifndef QRCODEGEN_TEST
 	#define testable static  // Keep functions private
@@ -127,12 +127,12 @@ static const int PENALTY_N4 = 10;
 // Public function - see documentation comment in header file.
 bool qrcodegen_encodeText(const char *text, uint8_t tempBuffer[], uint8_t qrcode[],
 		enum qrcodegen_Ecc ecl, int minVersion, int maxVersion, enum qrcodegen_Mask mask, bool boostEcl) {
-	
+
 	size_t textLen = strlen(text);
 	if (textLen == 0)
 		return qrcodegen_encodeSegmentsAdvanced(NULL, 0, ecl, minVersion, maxVersion, mask, boostEcl, tempBuffer, qrcode);
 	size_t bufLen = qrcodegen_BUFFER_LEN_FOR_VERSION(maxVersion);
-	
+
 	struct qrcodegen_Segment seg;
 	if (qrcodegen_isNumeric(text)) {
 		if (qrcodegen_calcSegmentBufferSize(qrcodegen_Mode_NUMERIC, textLen) > bufLen)
@@ -155,7 +155,7 @@ bool qrcodegen_encodeText(const char *text, uint8_t tempBuffer[], uint8_t qrcode
 		seg.data = tempBuffer;
 	}
 	return qrcodegen_encodeSegmentsAdvanced(&seg, 1, ecl, minVersion, maxVersion, mask, boostEcl, tempBuffer, qrcode);
-	
+
 fail:
 	qrcode[0] = 0;  // Set size to invalid value for safety
 	return false;
@@ -165,7 +165,7 @@ fail:
 // Public function - see documentation comment in header file.
 bool qrcodegen_encodeBinary(uint8_t dataAndTemp[], size_t dataLen, uint8_t qrcode[],
 		enum qrcodegen_Ecc ecl, int minVersion, int maxVersion, enum qrcodegen_Mask mask, bool boostEcl) {
-	
+
 	struct qrcodegen_Segment seg;
 	seg.mode = qrcodegen_Mode_BYTE;
 	seg.bitLength = calcSegmentBitLength(seg.mode, dataLen);
@@ -182,7 +182,7 @@ bool qrcodegen_encodeBinary(uint8_t dataAndTemp[], size_t dataLen, uint8_t qrcod
 // Appends the given number of low-order bits of the given value to the given byte-based
 // bit buffer, increasing the bit length. Requires 0 <= numBits <= 16 and val < 2^numBits.
 testable void appendBitsToBuffer(unsigned int val, int numBits, uint8_t buffer[], int *bitLen) {
-	assert(0 <= numBits && numBits <= 16 && (unsigned long)val >> numBits == 0);
+	LV_ASSERT(0 <= numBits && numBits <= 16 && (unsigned long)val >> numBits == 0);
 	for (int i = numBits - 1; i >= 0; i--, (*bitLen)++)
 		buffer[*bitLen >> 3] |= ((val >> i) & 1) << (7 - (*bitLen & 7));
 }
@@ -202,10 +202,10 @@ bool qrcodegen_encodeSegments(const struct qrcodegen_Segment segs[], size_t len,
 // Public function - see documentation comment in header file.
 bool qrcodegen_encodeSegmentsAdvanced(const struct qrcodegen_Segment segs[], size_t len, enum qrcodegen_Ecc ecl,
 		int minVersion, int maxVersion, int mask, bool boostEcl, uint8_t tempBuffer[], uint8_t qrcode[]) {
-	assert(segs != NULL || len == 0);
-	assert(qrcodegen_VERSION_MIN <= minVersion && minVersion <= maxVersion && maxVersion <= qrcodegen_VERSION_MAX);
-	assert(0 <= (int)ecl && (int)ecl <= 3 && -1 <= (int)mask && (int)mask <= 7);
-	
+	LV_ASSERT(segs != NULL || len == 0);
+	LV_ASSERT(qrcodegen_VERSION_MIN <= minVersion && minVersion <= maxVersion && maxVersion <= qrcodegen_VERSION_MAX);
+	LV_ASSERT(0 <= (int)ecl && (int)ecl <= 3 && -1 <= (int)mask && (int)mask <= 7);
+
 	// Find the minimal version number to use
 	int version, dataUsedBits;
 	for (version = minVersion; ; version++) {
@@ -218,14 +218,14 @@ bool qrcodegen_encodeSegmentsAdvanced(const struct qrcodegen_Segment segs[], siz
 			return false;
 		}
 	}
-	assert(dataUsedBits != -1);
-	
+	LV_ASSERT(dataUsedBits != -1);
+
 	// Increase the error correction level while the data still fits in the current version number
 	for (int i = (int)qrcodegen_Ecc_MEDIUM; i <= (int)qrcodegen_Ecc_HIGH; i++) {  // From low to high
 		if (boostEcl && dataUsedBits <= getNumDataCodewords(version, (enum qrcodegen_Ecc)i) * 8)
 			ecl = (enum qrcodegen_Ecc)i;
 	}
-	
+
 	// Concatenate all segments to create the data bit string
 	memset(qrcode, 0, qrcodegen_BUFFER_LEN_FOR_VERSION(version) * sizeof(qrcode[0]));
 	int bitLen = 0;
@@ -236,29 +236,29 @@ bool qrcodegen_encodeSegmentsAdvanced(const struct qrcodegen_Segment segs[], siz
 		for (int j = 0; j < seg->bitLength; j++)
 			appendBitsToBuffer((seg->data[j >> 3] >> (7 - (j & 7))) & 1, 1, qrcode, &bitLen);
 	}
-	assert(bitLen == dataUsedBits);
-	
+	LV_ASSERT(bitLen == dataUsedBits);
+
 	// Add terminator and pad up to a byte if applicable
 	int dataCapacityBits = getNumDataCodewords(version, ecl) * 8;
-	assert(bitLen <= dataCapacityBits);
+	LV_ASSERT(bitLen <= dataCapacityBits);
 	int terminatorBits = dataCapacityBits - bitLen;
 	if (terminatorBits > 4)
 		terminatorBits = 4;
 	appendBitsToBuffer(0, terminatorBits, qrcode, &bitLen);
 	appendBitsToBuffer(0, (8 - bitLen % 8) % 8, qrcode, &bitLen);
-	assert(bitLen % 8 == 0);
-	
+	LV_ASSERT(bitLen % 8 == 0);
+
 	// Pad with alternating bytes until data capacity is reached
 	for (uint8_t padByte = 0xEC; bitLen < dataCapacityBits; padByte ^= 0xEC ^ 0x11)
 		appendBitsToBuffer(padByte, 8, qrcode, &bitLen);
-	
+
 	// Draw function and data codeword modules
 	addEccAndInterleave(qrcode, version, ecl, tempBuffer);
 	initializeFunctionModules(version, qrcode);
 	drawCodewords(tempBuffer, getNumRawDataModules(version) / 8, qrcode);
 	drawWhiteFunctionModules(qrcode, version);
 	initializeFunctionModules(version, tempBuffer);
-	
+
 	// Handle masking
 	if (mask == qrcodegen_Mask_AUTO) {  // Automatically choose best mask
 		long minPenalty = LONG_MAX;
@@ -274,7 +274,7 @@ bool qrcodegen_encodeSegmentsAdvanced(const struct qrcodegen_Segment segs[], siz
 			applyMask(tempBuffer, qrcode, msk);  // Undoes the mask due to XOR
 		}
 	}
-	assert(0 <= (int)mask && (int)mask <= 7);
+	LV_ASSERT(0 <= (int)mask && (int)mask <= 7);
 	applyMask(tempBuffer, qrcode, mask);
 	drawFormatBits(ecl, mask, qrcode);
 	return true;
@@ -290,14 +290,14 @@ bool qrcodegen_encodeSegmentsAdvanced(const struct qrcodegen_Segment segs[], siz
 // be clobbered by this function. The final answer is stored in result[0 : rawCodewords].
 testable void addEccAndInterleave(uint8_t data[], int version, enum qrcodegen_Ecc ecl, uint8_t result[]) {
 	// Calculate parameter numbers
-	assert(0 <= (int)ecl && (int)ecl < 4 && qrcodegen_VERSION_MIN <= version && version <= qrcodegen_VERSION_MAX);
+	LV_ASSERT(0 <= (int)ecl && (int)ecl < 4 && qrcodegen_VERSION_MIN <= version && version <= qrcodegen_VERSION_MAX);
 	int numBlocks = NUM_ERROR_CORRECTION_BLOCKS[(int)ecl][version];
 	int blockEccLen = ECC_CODEWORDS_PER_BLOCK  [(int)ecl][version];
 	int rawCodewords = getNumRawDataModules(version) / 8;
 	int dataLen = getNumDataCodewords(version, ecl);
 	int numShortBlocks = numBlocks - rawCodewords % numBlocks;
 	int shortBlockDataLen = rawCodewords / numBlocks - blockEccLen;
-	
+
 	// Split data into blocks, calculate ECC, and interleave
 	// (not concatenate) the bytes into a single sequence
 	uint8_t generator[qrcodegen_REED_SOLOMON_DEGREE_MAX];
@@ -323,7 +323,7 @@ testable void addEccAndInterleave(uint8_t data[], int version, enum qrcodegen_Ec
 // for the given version number and error correction level. The result is in the range [9, 2956].
 testable int getNumDataCodewords(int version, enum qrcodegen_Ecc ecl) {
 	int v = version, e = (int)ecl;
-	assert(0 <= e && e < 4);
+	LV_ASSERT(0 <= e && e < 4);
 	return getNumRawDataModules(v) / 8
 		- ECC_CODEWORDS_PER_BLOCK    [e][v]
 		* NUM_ERROR_CORRECTION_BLOCKS[e][v];
@@ -334,7 +334,7 @@ testable int getNumDataCodewords(int version, enum qrcodegen_Ecc ecl) {
 // all function modules are excluded. This includes remainder bits, so it might not be a multiple of 8.
 // The result is in the range [208, 29648]. This could be implemented as a 40-entry lookup table.
 testable int getNumRawDataModules(int ver) {
-	assert(qrcodegen_VERSION_MIN <= ver && ver <= qrcodegen_VERSION_MAX);
+	LV_ASSERT(qrcodegen_VERSION_MIN <= ver && ver <= qrcodegen_VERSION_MAX);
 	int result = (16 * ver + 128) * ver + 64;
 	if (ver >= 2) {
 		int numAlign = ver / 7 + 2;
@@ -352,10 +352,10 @@ testable int getNumRawDataModules(int ver) {
 // Calculates the Reed-Solomon generator polynomial of the given degree, storing in result[0 : degree].
 testable void calcReedSolomonGenerator(int degree, uint8_t result[]) {
 	// Start with the monomial x^0
-	assert(1 <= degree && degree <= qrcodegen_REED_SOLOMON_DEGREE_MAX);
+	LV_ASSERT(1 <= degree && degree <= qrcodegen_REED_SOLOMON_DEGREE_MAX);
 	memset(result, 0, degree * sizeof(result[0]));
 	result[degree - 1] = 1;
-	
+
 	// Compute the product polynomial (x - r^0) * (x - r^1) * (x - r^2) * ... * (x - r^{degree-1}),
 	// drop the highest term, and store the rest of the coefficients in order of descending powers.
 	// Note that r = 0x02, which is a generator element of this field GF(2^8/0x11D).
@@ -376,9 +376,9 @@ testable void calcReedSolomonGenerator(int degree, uint8_t result[]) {
 // polynomials are in big endian and the generator has an implicit leading 1 term, storing the result in result[0 : degree].
 testable void calcReedSolomonRemainder(const uint8_t data[], int dataLen,
 		const uint8_t generator[], int degree, uint8_t result[]) {
-	
+
 	// Perform polynomial division
-	assert(1 <= degree && degree <= qrcodegen_REED_SOLOMON_DEGREE_MAX);
+	LV_ASSERT(1 <= degree && degree <= qrcodegen_REED_SOLOMON_DEGREE_MAX);
 	memset(result, 0, degree * sizeof(result[0]));
 	for (int i = 0; i < dataLen; i++) {
 		uint8_t factor = data[i] ^ result[0];
@@ -415,16 +415,16 @@ testable void initializeFunctionModules(int version, uint8_t qrcode[]) {
 	int qrsize = version * 4 + 17;
 	memset(qrcode, 0, ((qrsize * qrsize + 7) / 8 + 1) * sizeof(qrcode[0]));
 	qrcode[0] = (uint8_t)qrsize;
-	
+
 	// Fill horizontal and vertical timing patterns
 	fillRectangle(6, 0, 1, qrsize, qrcode);
 	fillRectangle(0, 6, qrsize, 1, qrcode);
-	
+
 	// Fill 3 finder patterns (all corners except bottom right) and format bits
 	fillRectangle(0, 0, 9, 9, qrcode);
 	fillRectangle(qrsize - 8, 0, 8, 9, qrcode);
 	fillRectangle(0, qrsize - 8, 9, 8, qrcode);
-	
+
 	// Fill numerous alignment patterns
 	uint8_t alignPatPos[7];
 	int numAlign = getAlignmentPatternPositions(version, alignPatPos);
@@ -435,7 +435,7 @@ testable void initializeFunctionModules(int version, uint8_t qrcode[]) {
 				fillRectangle(alignPatPos[i] - 2, alignPatPos[j] - 2, 5, 5, qrcode);
 		}
 	}
-	
+
 	// Fill version blocks
 	if (version >= 7) {
 		fillRectangle(qrsize - 11, 0, 3, 6, qrcode);
@@ -454,7 +454,7 @@ static void drawWhiteFunctionModules(uint8_t qrcode[], int version) {
 		setModule(qrcode, 6, i, false);
 		setModule(qrcode, i, 6, false);
 	}
-	
+
 	// Draw 3 finder patterns (all corners except bottom right; overwrites some timing modules)
 	for (int dy = -4; dy <= 4; dy++) {
 		for (int dx = -4; dx <= 4; dx++) {
@@ -468,7 +468,7 @@ static void drawWhiteFunctionModules(uint8_t qrcode[], int version) {
 			}
 		}
 	}
-	
+
 	// Draw numerous alignment patterns
 	uint8_t alignPatPos[7];
 	int numAlign = getAlignmentPatternPositions(version, alignPatPos);
@@ -482,7 +482,7 @@ static void drawWhiteFunctionModules(uint8_t qrcode[], int version) {
 			}
 		}
 	}
-	
+
 	// Draw version blocks
 	if (version >= 7) {
 		// Calculate error correction code and pack bits
@@ -490,8 +490,8 @@ static void drawWhiteFunctionModules(uint8_t qrcode[], int version) {
 		for (int i = 0; i < 12; i++)
 			rem = (rem << 1) ^ ((rem >> 11) * 0x1F25);
 		long bits = (long)version << 12 | rem;  // uint18
-		assert(bits >> 18 == 0);
-		
+		LV_ASSERT(bits >> 18 == 0);
+
 		// Draw two copies
 		for (int i = 0; i < 6; i++) {
 			for (int j = 0; j < 3; j++) {
@@ -510,15 +510,15 @@ static void drawWhiteFunctionModules(uint8_t qrcode[], int version) {
 // the format bits, unlike drawWhiteFunctionModules() which might skip black modules.
 static void drawFormatBits(enum qrcodegen_Ecc ecl, enum qrcodegen_Mask mask, uint8_t qrcode[]) {
 	// Calculate error correction code and pack bits
-	assert(0 <= (int)mask && (int)mask <= 7);
+	LV_ASSERT(0 <= (int)mask && (int)mask <= 7);
 	static const int table[] = {1, 0, 3, 2};
 	int data = table[(int)ecl] << 3 | (int)mask;  // errCorrLvl is uint2, mask is uint3
 	int rem = data;
 	for (int i = 0; i < 10; i++)
 		rem = (rem << 1) ^ ((rem >> 9) * 0x537);
 	int bits = (data << 10 | rem) ^ 0x5412;  // uint15
-	assert(bits >> 15 == 0);
-	
+	LV_ASSERT(bits >> 15 == 0);
+
 	// Draw first copy
 	for (int i = 0; i <= 5; i++)
 		setModule(qrcode, 8, i, getBit(bits, i));
@@ -527,7 +527,7 @@ static void drawFormatBits(enum qrcodegen_Ecc ecl, enum qrcodegen_Mask mask, uin
 	setModule(qrcode, 7, 8, getBit(bits, 8));
 	for (int i = 9; i < 15; i++)
 		setModule(qrcode, 14 - i, 8, getBit(bits, i));
-	
+
 	// Draw second copy
 	int qrsize = qrcodegen_getSize(qrcode);
 	for (int i = 0; i < 8; i++)
@@ -591,7 +591,7 @@ static void drawCodewords(const uint8_t data[], int dataLen, uint8_t qrcode[]) {
 			}
 		}
 	}
-	assert(i == dataLen * 8);
+	LV_ASSERT(i == dataLen * 8);
 }
 
 
@@ -601,7 +601,7 @@ static void drawCodewords(const uint8_t data[], int dataLen, uint8_t qrcode[]) {
 // the same mask value a second time will undo the mask. A final well-formed
 // QR Code needs exactly one (not zero, two, etc.) mask applied.
 static void applyMask(const uint8_t functionModules[], uint8_t qrcode[], enum qrcodegen_Mask mask) {
-	assert(0 <= (int)mask && (int)mask <= 7);  // Disallows qrcodegen_Mask_AUTO
+	LV_ASSERT(0 <= (int)mask && (int)mask <= 7);  // Disallows qrcodegen_Mask_AUTO
 	int qrsize = qrcodegen_getSize(qrcode);
 	for (int y = 0; y < qrsize; y++) {
 		for (int x = 0; x < qrsize; x++) {
@@ -617,7 +617,7 @@ static void applyMask(const uint8_t functionModules[], uint8_t qrcode[], enum qr
 				case 5:  invert = x * y % 2 + x * y % 3 == 0;          break;
 				case 6:  invert = (x * y % 2 + x * y % 3) % 2 == 0;    break;
 				case 7:  invert = ((x + y) % 2 + x * y % 3) % 2 == 0;  break;
-				default:  assert(false);  return;
+				default:  LV_ASSERT(false);  return;
 			}
 			bool val = getModule(qrcode, x, y);
 			setModule(qrcode, x, y, val ^ invert);
@@ -631,7 +631,7 @@ static void applyMask(const uint8_t functionModules[], uint8_t qrcode[], enum qr
 static long getPenaltyScore(const uint8_t qrcode[]) {
 	int qrsize = qrcodegen_getSize(qrcode);
 	long result = 0;
-	
+
 	// Adjacent modules in row having same color, and finder-like patterns
 	for (int y = 0; y < qrsize; y++) {
 		unsigned char runHistory[7] = {0};
@@ -684,7 +684,7 @@ static long getPenaltyScore(const uint8_t qrcode[]) {
 		if (hasFinderLikePattern(runHistory))
 			result += PENALTY_N3;
 	}
-	
+
 	// 2*2 blocks of modules having same color
 	for (int y = 0; y < qrsize - 1; y++) {
 		for (int x = 0; x < qrsize - 1; x++) {
@@ -695,7 +695,7 @@ static long getPenaltyScore(const uint8_t qrcode[]) {
 				result += PENALTY_N2;
 		}
 	}
-	
+
 	// Balance of black and white modules
 	int black = 0;
 	for (int y = 0; y < qrsize; y++) {
@@ -737,9 +737,9 @@ static bool hasFinderLikePattern(const unsigned char runHistory[7]) {
 
 // Public function - see documentation comment in header file.
 int qrcodegen_getSize(const uint8_t qrcode[]) {
-	assert(qrcode != NULL);
+	LV_ASSERT(qrcode != NULL);
 	int result = qrcode[0];
-	assert((qrcodegen_VERSION_MIN * 4 + 17) <= result
+	LV_ASSERT((qrcodegen_VERSION_MIN * 4 + 17) <= result
 		&& result <= (qrcodegen_VERSION_MAX * 4 + 17));
 	return result;
 }
@@ -747,7 +747,7 @@ int qrcodegen_getSize(const uint8_t qrcode[]) {
 
 // Public function - see documentation comment in header file.
 bool qrcodegen_getModule(const uint8_t qrcode[], int x, int y) {
-	assert(qrcode != NULL);
+	LV_ASSERT(qrcode != NULL);
 	int qrsize = qrcode[0];
 	return (0 <= x && x < qrsize && 0 <= y && y < qrsize) && getModule(qrcode, x, y);
 }
@@ -756,7 +756,7 @@ bool qrcodegen_getModule(const uint8_t qrcode[], int x, int y) {
 // Gets the module at the given coordinates, which must be in bounds.
 testable bool getModule(const uint8_t qrcode[], int x, int y) {
 	int qrsize = qrcode[0];
-	assert(21 <= qrsize && qrsize <= 177 && 0 <= x && x < qrsize && 0 <= y && y < qrsize);
+	LV_ASSERT(21 <= qrsize && qrsize <= 177 && 0 <= x && x < qrsize && 0 <= y && y < qrsize);
 	int index = y * qrsize + x;
 	return getBit(qrcode[(index >> 3) + 1], index & 7);
 }
@@ -765,7 +765,7 @@ testable bool getModule(const uint8_t qrcode[], int x, int y) {
 // Sets the module at the given coordinates, which must be in bounds.
 testable void setModule(uint8_t qrcode[], int x, int y, bool isBlack) {
 	int qrsize = qrcode[0];
-	assert(21 <= qrsize && qrsize <= 177 && 0 <= x && x < qrsize && 0 <= y && y < qrsize);
+	LV_ASSERT(21 <= qrsize && qrsize <= 177 && 0 <= x && x < qrsize && 0 <= y && y < qrsize);
 	int index = y * qrsize + x;
 	int bitIndex = index & 7;
 	int byteIndex = (index >> 3) + 1;
@@ -795,7 +795,7 @@ static bool getBit(int x, int i) {
 
 // Public function - see documentation comment in header file.
 bool qrcodegen_isAlphanumeric(const char *text) {
-	assert(text != NULL);
+	LV_ASSERT(text != NULL);
 	for (; *text != '\0'; text++) {
 		if (strchr(ALPHANUMERIC_CHARSET, *text) == NULL)
 			return false;
@@ -806,7 +806,7 @@ bool qrcodegen_isAlphanumeric(const char *text) {
 
 // Public function - see documentation comment in header file.
 bool qrcodegen_isNumeric(const char *text) {
-	assert(text != NULL);
+	LV_ASSERT(text != NULL);
 	for (; *text != '\0'; text++) {
 		if (*text < '0' || *text > '9')
 			return false;
@@ -820,7 +820,7 @@ size_t qrcodegen_calcSegmentBufferSize(enum qrcodegen_Mode mode, size_t numChars
 	int temp = calcSegmentBitLength(mode, numChars);
 	if (temp == -1)
 		return SIZE_MAX;
-	assert(0 <= temp && temp <= INT16_MAX);
+	LV_ASSERT(0 <= temp && temp <= INT16_MAX);
 	return ((size_t)temp + 7) / 8;
 }
 
@@ -849,10 +849,10 @@ testable int calcSegmentBitLength(enum qrcodegen_Mode mode, size_t numChars) {
 	else if (mode == qrcodegen_Mode_ECI && numChars == 0)
 		result = 3 * 8;
 	else {  // Invalid argument
-		assert(false);
+		LV_ASSERT(false);
 		return -1;
 	}
-	assert(result >= 0);
+	LV_ASSERT(result >= 0);
 	if ((unsigned int)result > (unsigned int)INT16_MAX)
 		return -1;
 	return (int)result;
@@ -861,11 +861,11 @@ testable int calcSegmentBitLength(enum qrcodegen_Mode mode, size_t numChars) {
 
 // Public function - see documentation comment in header file.
 struct qrcodegen_Segment qrcodegen_makeBytes(const uint8_t data[], size_t len, uint8_t buf[]) {
-	assert(data != NULL || len == 0);
+	LV_ASSERT(data != NULL || len == 0);
 	struct qrcodegen_Segment result;
 	result.mode = qrcodegen_Mode_BYTE;
 	result.bitLength = calcSegmentBitLength(result.mode, len);
-	assert(result.bitLength != -1);
+	LV_ASSERT(result.bitLength != -1);
 	result.numChars = (int)len;
 	if (len > 0)
 		memcpy(buf, data, len * sizeof(buf[0]));
@@ -876,22 +876,22 @@ struct qrcodegen_Segment qrcodegen_makeBytes(const uint8_t data[], size_t len, u
 
 // Public function - see documentation comment in header file.
 struct qrcodegen_Segment qrcodegen_makeNumeric(const char *digits, uint8_t buf[]) {
-	assert(digits != NULL);
+	LV_ASSERT(digits != NULL);
 	struct qrcodegen_Segment result;
 	size_t len = strlen(digits);
 	result.mode = qrcodegen_Mode_NUMERIC;
 	int bitLen = calcSegmentBitLength(result.mode, len);
-	assert(bitLen != -1);
+	LV_ASSERT(bitLen != -1);
 	result.numChars = (int)len;
 	if (bitLen > 0)
 		memset(buf, 0, ((size_t)bitLen + 7) / 8 * sizeof(buf[0]));
 	result.bitLength = 0;
-	
+
 	unsigned int accumData = 0;
 	int accumCount = 0;
 	for (; *digits != '\0'; digits++) {
 		char c = *digits;
-		assert('0' <= c && c <= '9');
+		LV_ASSERT('0' <= c && c <= '9');
 		accumData = accumData * 10 + (unsigned int)(c - '0');
 		accumCount++;
 		if (accumCount == 3) {
@@ -902,7 +902,7 @@ struct qrcodegen_Segment qrcodegen_makeNumeric(const char *digits, uint8_t buf[]
 	}
 	if (accumCount > 0)  // 1 or 2 digits remaining
 		appendBitsToBuffer(accumData, accumCount * 3 + 1, buf, &result.bitLength);
-	assert(result.bitLength == bitLen);
+	LV_ASSERT(result.bitLength == bitLen);
 	result.data = buf;
 	return result;
 }
@@ -910,22 +910,22 @@ struct qrcodegen_Segment qrcodegen_makeNumeric(const char *digits, uint8_t buf[]
 
 // Public function - see documentation comment in header file.
 struct qrcodegen_Segment qrcodegen_makeAlphanumeric(const char *text, uint8_t buf[]) {
-	assert(text != NULL);
+	LV_ASSERT(text != NULL);
 	struct qrcodegen_Segment result;
 	size_t len = strlen(text);
 	result.mode = qrcodegen_Mode_ALPHANUMERIC;
 	int bitLen = calcSegmentBitLength(result.mode, len);
-	assert(bitLen != -1);
+	LV_ASSERT(bitLen != -1);
 	result.numChars = (int)len;
 	if (bitLen > 0)
 		memset(buf, 0, ((size_t)bitLen + 7) / 8 * sizeof(buf[0]));
 	result.bitLength = 0;
-	
+
 	unsigned int accumData = 0;
 	int accumCount = 0;
 	for (; *text != '\0'; text++) {
 		const char *temp = strchr(ALPHANUMERIC_CHARSET, *text);
-		assert(temp != NULL);
+		LV_ASSERT(temp != NULL);
 		accumData = accumData * 45 + (unsigned int)(temp - ALPHANUMERIC_CHARSET);
 		accumCount++;
 		if (accumCount == 2) {
@@ -936,7 +936,7 @@ struct qrcodegen_Segment qrcodegen_makeAlphanumeric(const char *text, uint8_t bu
 	}
 	if (accumCount > 0)  // 1 character remaining
 		appendBitsToBuffer(accumData, 6, buf, &result.bitLength);
-	assert(result.bitLength == bitLen);
+	LV_ASSERT(result.bitLength == bitLen);
 	result.data = buf;
 	return result;
 }
@@ -949,7 +949,7 @@ struct qrcodegen_Segment qrcodegen_makeEci(long assignVal, uint8_t buf[]) {
 	result.numChars = 0;
 	result.bitLength = 0;
 	if (assignVal < 0) {
-		assert(false);
+		LV_ASSERT(false);
 	} else if (assignVal < (1 << 7)) {
 		memset(buf, 0, 1 * sizeof(buf[0]));
 		appendBitsToBuffer(assignVal, 8, buf, &result.bitLength);
@@ -963,7 +963,7 @@ struct qrcodegen_Segment qrcodegen_makeEci(long assignVal, uint8_t buf[]) {
 		appendBitsToBuffer(assignVal >> 10, 11, buf, &result.bitLength);
 		appendBitsToBuffer(assignVal & 0x3FF, 10, buf, &result.bitLength);
 	} else {
-		assert(false);
+		LV_ASSERT(false);
 	}
 	result.data = buf;
 	return result;
@@ -974,22 +974,22 @@ struct qrcodegen_Segment qrcodegen_makeEci(long assignVal, uint8_t buf[]) {
 // Returns a non-negative number if successful. Otherwise returns -1 if a segment has too
 // many characters to fit its length field, or the total bits exceeds INT16_MAX.
 testable int getTotalBits(const struct qrcodegen_Segment segs[], size_t len, int version) {
-	assert(segs != NULL || len == 0);
+	LV_ASSERT(segs != NULL || len == 0);
 	long result = 0;
 	for (size_t i = 0; i < len; i++) {
 		int numChars  = segs[i].numChars;
 		int bitLength = segs[i].bitLength;
-		assert(0 <= numChars  && numChars  <= INT16_MAX);
-		assert(0 <= bitLength && bitLength <= INT16_MAX);
+		LV_ASSERT(0 <= numChars  && numChars  <= INT16_MAX);
+		LV_ASSERT(0 <= bitLength && bitLength <= INT16_MAX);
 		int ccbits = numCharCountBits(segs[i].mode, version);
-		assert(0 <= ccbits && ccbits <= 16);
+		LV_ASSERT(0 <= ccbits && ccbits <= 16);
 		if (numChars >= (1L << ccbits))
 			return -1;  // The segment's length doesn't fit the field's bit width
 		result += 4L + ccbits + bitLength;
 		if (result > INT16_MAX)
 			return -1;  // The sum might overflow an int type
 	}
-	assert(0 <= result && result <= INT16_MAX);
+	LV_ASSERT(0 <= result && result <= INT16_MAX);
 	return (int)result;
 }
 
@@ -997,7 +997,7 @@ testable int getTotalBits(const struct qrcodegen_Segment segs[], size_t len, int
 // Returns the bit width of the character count field for a segment in the given mode
 // in a QR Code at the given version number. The result is in the range [0, 16].
 static int numCharCountBits(enum qrcodegen_Mode mode, int version) {
-	assert(qrcodegen_VERSION_MIN <= version && version <= qrcodegen_VERSION_MAX);
+	LV_ASSERT(qrcodegen_VERSION_MIN <= version && version <= qrcodegen_VERSION_MAX);
 	int i = (version + 7) / 17;
 	switch (mode) {
 		case qrcodegen_Mode_NUMERIC     : { static const int temp[] = {10, 12, 14}; return temp[i]; }
@@ -1005,7 +1005,7 @@ static int numCharCountBits(enum qrcodegen_Mode mode, int version) {
 		case qrcodegen_Mode_BYTE        : { static const int temp[] = { 8, 16, 16}; return temp[i]; }
 		case qrcodegen_Mode_KANJI       : { static const int temp[] = { 8, 10, 12}; return temp[i]; }
 		case qrcodegen_Mode_ECI         : return 0;
-		default:  assert(false);  return -1;  // Dummy value
+		default:  LV_ASSERT(false);  return -1;  // Dummy value
 	}
 }
 

src/extra/libs/tiny_ttf/lv_tiny_ttf.c

@@ -0,0 +1,284 @@
+#include "lv_tiny_ttf.h"
+
+#if LV_USE_TINY_TTF
+#include <stdio.h>
+#include "../../../misc/lv_lru.h"
+
+#define STB_RECT_PACK_IMPLEMENTATION
+#define STBRP_STATIC
+#define STBTT_STATIC
+#define STB_TRUETYPE_IMPLEMENTATION
+#define STBTT_HEAP_FACTOR_SIZE_32 50
+#define STBTT_HEAP_FACTOR_SIZE_128 20
+#define STBTT_HEAP_FACTOR_SIZE_DEFAULT 10
+#define STBTT_malloc(x, u) ((void)(u), lv_mem_alloc(x))
+#define STBTT_free(x, u) ((void)(u), lv_mem_free(x))
+#define TTF_MALLOC(x) (lv_mem_alloc(x))
+#define TTF_FREE(x) (lv_mem_free(x))
+
+#if LV_TINY_TTF_FILE_SUPPORT
+/* a hydra stream that can be in memory or from a file*/
+typedef struct ttf_cb_stream {
+    lv_fs_file_t * file;
+    const void * data;
+    size_t size;
+    size_t position;
+} ttf_cb_stream_t;
+
+static void ttf_cb_stream_read(ttf_cb_stream_t * stream, void * data, size_t to_read)
+{
+    if(stream->file != NULL) {
+        uint32_t br;
+        lv_fs_read(stream->file, data, to_read, &br);
+    }
+    else {
+        if(to_read + stream->position >= stream->size) {
+            to_read = stream->size - stream->position;
+        }
+        lv_memcpy(data, ((const unsigned char *)stream->data + stream->position), to_read);
+        stream->position += to_read;
+    }
+}
+static void ttf_cb_stream_seek(ttf_cb_stream_t * stream, size_t position)
+{
+    if(stream->file != NULL) {
+        lv_fs_seek(stream->file, position, LV_FS_SEEK_SET);
+    }
+    else {
+        if(position > stream->size) {
+            stream->position = stream->size;
+        }
+        else {
+            stream->position = position;
+        }
+    }
+}
+
+/* for stream support */
+#define STBTT_STREAM_TYPE ttf_cb_stream_t *
+#define STBTT_STREAM_SEEK(s, x) ttf_cb_stream_seek(s, x);
+#define STBTT_STREAM_READ(s, x, y) ttf_cb_stream_read(s, x, y);
+#endif /*LV_TINY_TTF_FILE_SUPPORT*/
+
+#include "stb_rect_pack.h"
+#include "stb_truetype_htcw.h"
+
+typedef struct ttf_font_desc {
+    lv_fs_file_t file;
+#if LV_TINY_TTF_FILE_SUPPORT
+    ttf_cb_stream_t stream;
+#else
+    const uint8_t * stream;
+#endif
+    stbtt_fontinfo info;
+    float scale;
+    int ascent;
+    int descent;
+    lv_lru_t * bitmap_cache;
+} ttf_font_desc_t;
+
+typedef struct ttf_bitmap_cache_key {
+    uint32_t unicode_letter;
+    lv_coord_t line_height;
+} ttf_bitmap_cache_key_t;
+
+static bool ttf_get_glyph_dsc_cb(const lv_font_t * font, lv_font_glyph_dsc_t * dsc_out, uint32_t unicode_letter,
+                                 uint32_t unicode_letter_next)
+{
+    if(unicode_letter < 0x20 ||
+       unicode_letter == 0xf8ff || /*LV_SYMBOL_DUMMY*/
+       unicode_letter == 0x200c) { /*ZERO WIDTH NON-JOINER*/
+        dsc_out->box_w = 0;
+        dsc_out->adv_w = 0;
+        dsc_out->box_h = 0; /*height of the bitmap in [px]*/
+        dsc_out->ofs_x = 0; /*X offset of the bitmap in [pf]*/
+        dsc_out->ofs_y = 0; /*Y offset of the bitmap in [pf]*/
+        dsc_out->bpp = 0;
+        dsc_out->is_placeholder = false;
+        return true;
+    }
+    ttf_font_desc_t * dsc = (ttf_font_desc_t *)font->dsc;
+    int g1 = stbtt_FindGlyphIndex(&dsc->info, (int)unicode_letter);
+    if(g1 == 0) {
+        /* Glyph not found */
+        return false;
+    }
+    int x1, y1, x2, y2;
+
+    stbtt_GetGlyphBitmapBox(&dsc->info, g1, dsc->scale, dsc->scale, &x1, &y1, &x2, &y2);
+    int g2 = 0;
+    if(unicode_letter_next != 0) {
+        g2 = stbtt_FindGlyphIndex(&dsc->info, (int)unicode_letter_next);
+    }
+    int advw, lsb;
+    stbtt_GetGlyphHMetrics(&dsc->info, g1, &advw, &lsb);
+    int k = stbtt_GetGlyphKernAdvance(&dsc->info, g1, g2);
+    dsc_out->adv_w = (uint16_t)floor((((float)advw + (float)k) * dsc->scale) +
+                                     0.5f); /*Horizontal space required by the glyph in [px]*/
+
+    dsc_out->adv_w = (uint16_t)floor((((float)advw + (float)k) * dsc->scale) +
+                                     0.5f); /*Horizontal space required by the glyph in [px]*/
+    dsc_out->box_w = (x2 - x1 + 1);         /*width of the bitmap in [px]*/
+    dsc_out->box_h = (y2 - y1 + 1);         /*height of the bitmap in [px]*/
+    dsc_out->ofs_x = x1;                    /*X offset of the bitmap in [pf]*/
+    dsc_out->ofs_y = -y2;                   /*Y offset of the bitmap measured from the as line*/
+    dsc_out->bpp = 8;                       /*Bits per pixel: 1/2/4/8*/
+    dsc_out->is_placeholder = false;
+    return true; /*true: glyph found; false: glyph was not found*/
+}
+
+static const uint8_t * ttf_get_glyph_bitmap_cb(const lv_font_t * font, uint32_t unicode_letter)
+{
+    ttf_font_desc_t * dsc = (ttf_font_desc_t *)font->dsc;
+    const stbtt_fontinfo * info = (const stbtt_fontinfo *)&dsc->info;
+    int g1 = stbtt_FindGlyphIndex(info, (int)unicode_letter);
+    if(g1 == 0) {
+        /* Glyph not found */
+        return NULL;
+    }
+    int x1, y1, x2, y2;
+    stbtt_GetGlyphBitmapBox(info, g1, dsc->scale, dsc->scale, &x1, &y1, &x2, &y2);
+    int w, h;
+    w = x2 - x1 + 1;
+    h = y2 - y1 + 1;
+    uint32_t stride = w;
+    /*Try to load from cache*/
+    ttf_bitmap_cache_key_t cache_key;
+    lv_memset(&cache_key, 0, sizeof(cache_key)); /*Zero padding*/
+    cache_key.unicode_letter = unicode_letter;
+    cache_key.line_height = font->line_height;
+    uint8_t * buffer = NULL;
+    lv_lru_get(dsc->bitmap_cache, &cache_key, sizeof(cache_key), (void **)&buffer);
+    if(buffer) {
+        return buffer;
+    }
+    LV_LOG_TRACE("cache miss for letter: %u", unicode_letter);
+    /*Prepare space in cache*/
+    size_t szb = h * stride;
+    buffer = lv_mem_alloc(szb);
+    if(!buffer) {
+        LV_LOG_ERROR("failed to allocate cache value");
+        return NULL;
+    }
+    lv_memset(buffer, 0, szb);
+    if(LV_LRU_OK != lv_lru_set(dsc->bitmap_cache, &cache_key, sizeof(cache_key), buffer, szb)) {
+        LV_LOG_ERROR("failed to add cache value");
+        lv_mem_free(buffer);
+        return NULL;
+    }
+    /*Render into cache*/
+    stbtt_MakeGlyphBitmap(info, buffer, w, h, stride, dsc->scale, dsc->scale, g1);
+    return buffer;
+}
+
+static lv_font_t * lv_tiny_ttf_create(const char * path, const void * data, size_t data_size, lv_coord_t font_size,
+                                      size_t cache_size)
+{
+    if((path == NULL && data == NULL) || 0 >= font_size) {
+        LV_LOG_ERROR("tiny_ttf: invalid argument\n");
+        return NULL;
+    }
+    ttf_font_desc_t * dsc = (ttf_font_desc_t *)TTF_MALLOC(sizeof(ttf_font_desc_t));
+    if(dsc == NULL) {
+        LV_LOG_ERROR("tiny_ttf: out of memory\n");
+        return NULL;
+    }
+#if LV_TINY_TTF_FILE_SUPPORT
+    if(path != NULL) {
+        if(LV_FS_RES_OK != lv_fs_open(&dsc->file, path, LV_FS_MODE_RD)) {
+            LV_LOG_ERROR("tiny_ttf: unable to open %s\n", path);
+            goto err_after_dsc;
+        }
+        dsc->stream.file = &dsc->file;
+    }
+    else {
+        dsc->stream.file = NULL;
+        dsc->stream.data = (const uint8_t *)data;
+        dsc->stream.size = data_size;
+        dsc->stream.position = 0;
+    }
+    if(0 == stbtt_InitFont(&dsc->info, &dsc->stream, stbtt_GetFontOffsetForIndex(&dsc->stream, 0))) {
+        LV_LOG_ERROR("tiny_ttf: init failed\n");
+        goto err_after_dsc;
+    }
+
+#else
+    dsc->stream = (const uint8_t *)data;
+    LV_UNUSED(data_size);
+    if(0 == stbtt_InitFont(&dsc->info, dsc->stream, stbtt_GetFontOffsetForIndex(dsc->stream, 0))) {
+        LV_LOG_ERROR("tiny_ttf: init failed\n");
+        goto err_after_dsc;
+    }
+#endif
+
+    dsc->bitmap_cache = lv_lru_create(cache_size, font_size * font_size, lv_mem_free, lv_mem_free);
+    if(dsc->bitmap_cache == NULL) {
+        LV_LOG_ERROR("failed to create lru cache");
+        goto err_after_dsc;
+    }
+
+    lv_font_t * out_font = (lv_font_t *)TTF_MALLOC(sizeof(lv_font_t));
+    if(out_font == NULL) {
+        LV_LOG_ERROR("tiny_ttf: out of memory\n");
+        goto err_after_bitmap_cache;
+    }
+    lv_memset(out_font, 0, sizeof(lv_font_t));
+    out_font->get_glyph_dsc = ttf_get_glyph_dsc_cb;
+    out_font->get_glyph_bitmap = ttf_get_glyph_bitmap_cb;
+    out_font->dsc = dsc;
+    lv_tiny_ttf_set_size(out_font, font_size);
+    return out_font;
+err_after_bitmap_cache:
+    lv_lru_del(dsc->bitmap_cache);
+err_after_dsc:
+    TTF_FREE(dsc);
+    return NULL;
+}
+#if LV_TINY_TTF_FILE_SUPPORT
+lv_font_t * lv_tiny_ttf_create_file_ex(const char * path, lv_coord_t font_size, size_t cache_size)
+{
+    return lv_tiny_ttf_create(path, NULL, 0, font_size, cache_size);
+}
+lv_font_t * lv_tiny_ttf_create_file(const char * path, lv_coord_t font_size)
+{
+    return lv_tiny_ttf_create_file_ex(path, font_size, 4096);
+}
+#endif /*LV_TINY_TTF_FILE_SUPPORT*/
+lv_font_t * lv_tiny_ttf_create_data_ex(const void * data, size_t data_size, lv_coord_t font_size, size_t cache_size)
+{
+    return lv_tiny_ttf_create(NULL, data, data_size, font_size, cache_size);
+}
+lv_font_t * lv_tiny_ttf_create_data(const void * data, size_t data_size, lv_coord_t font_size)
+{
+    return lv_tiny_ttf_create_data_ex(data, data_size, font_size, 4096);
+}
+void lv_tiny_ttf_set_size(lv_font_t * font, lv_coord_t font_size)
+{
+    if(font_size <= 0) {
+        LV_LOG_ERROR("invalid font size: %"PRIx32, font_size);
+        return;
+    }
+    ttf_font_desc_t * dsc = (ttf_font_desc_t *)font->dsc;
+    dsc->scale = stbtt_ScaleForMappingEmToPixels(&dsc->info, font_size);
+    int line_gap = 0;
+    stbtt_GetFontVMetrics(&dsc->info, &dsc->ascent, &dsc->descent, &line_gap);
+    font->line_height = (lv_coord_t)(dsc->scale * (dsc->ascent - dsc->descent + line_gap));
+    font->base_line = (lv_coord_t)(dsc->scale * (line_gap - dsc->descent));
+}
+void lv_tiny_ttf_destroy(lv_font_t * font)
+{
+    if(font != NULL) {
+        if(font->dsc != NULL) {
+            ttf_font_desc_t * ttf = (ttf_font_desc_t *)font->dsc;
+#if LV_TINY_TTF_FILE_SUPPORT
+            if(ttf->stream.file != NULL) {
+                lv_fs_close(&ttf->file);
+            }
+#endif
+            lv_lru_del(ttf->bitmap_cache);
+            TTF_FREE(ttf);
+        }
+        TTF_FREE(font);
+    }
+}
+#endif /*LV_USE_TINY_TTF*/

src/extra/libs/tiny_ttf/lv_tiny_ttf.h

@@ -0,0 +1,62 @@
+/**
+ * @file lv_tiny_ttf.h
+ *
+ */
+
+#ifndef LV_TINY_TTF_H
+#define LV_TINY_TTF_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#include "../../../lvgl.h"
+
+#if LV_USE_TINY_TTF
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+
+#if LV_TINY_TTF_FILE_SUPPORT
+/* create a font from the specified file or path with the specified line height.*/
+lv_font_t * lv_tiny_ttf_create_file(const char * path, lv_coord_t font_size);
+
+/* create a font from the specified file or path with the specified line height with the specified cache size.*/
+lv_font_t * lv_tiny_ttf_create_file_ex(const char * path, lv_coord_t font_size, size_t cache_size);
+#endif /*LV_TINY_TTF_FILE_SUPPORT*/
+
+/* create a font from the specified data pointer with the specified line height.*/
+lv_font_t * lv_tiny_ttf_create_data(const void * data, size_t data_size, lv_coord_t font_size);
+
+/* create a font from the specified data pointer with the specified line height and the specified cache size.*/
+lv_font_t * lv_tiny_ttf_create_data_ex(const void * data, size_t data_size, lv_coord_t font_size, size_t cache_size);
+
+/* set the size of the font to a new font_size*/
+void lv_tiny_ttf_set_size(lv_font_t * font, lv_coord_t font_size);
+
+/* destroy a font previously created with lv_tiny_ttf_create_xxxx()*/
+void lv_tiny_ttf_destroy(lv_font_t * font);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#endif /*LV_USE_TINY_TTF*/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_TINY_TTF_H*/

src/extra/libs/tiny_ttf/stb_rect_pack.h

@@ -0,0 +1,637 @@
+// stb_rect_pack.h - v1.01 - public domain - rectangle packing
+// Sean Barrett 2014
+//
+// Useful for e.g. packing rectangular textures into an atlas.
+// Does not do rotation.
+//
+// Before #including,
+//
+//    #define STB_RECT_PACK_IMPLEMENTATION
+//
+// in the file that you want to have the implementation.
+//
+// Not necessarily the awesomest packing method, but better than
+// the totally naive one in stb_truetype (which is primarily what
+// this is meant to replace).
+//
+// Has only had a few tests run, may have issues.
+//
+// More docs to come.
+//
+// No memory allocations; uses qsort() and assert() from stdlib.
+// Can override those by defining STBRP_SORT and STBRP_ASSERT.
+//
+// This library currently uses the Skyline Bottom-Left algorithm.
+//
+// Please note: better rectangle packers are welcome! Please
+// implement them to the same API, but with a different init
+// function.
+//
+// Credits
+//
+//  Library
+//    Sean Barrett
+//  Minor features
+//    Martins Mozeiko
+//    github:IntellectualKitty
+//
+//  Bugfixes / warning fixes
+//    Jeremy Jaussaud
+//    Fabian Giesen
+//
+// Version history:
+//
+//     1.01  (2021-07-11)  always use large rect mode, expose STBRP__MAXVAL in public section
+//     1.00  (2019-02-25)  avoid small space waste; gracefully fail too-wide rectangles
+//     0.99  (2019-02-07)  warning fixes
+//     0.11  (2017-03-03)  return packing success/fail result
+//     0.10  (2016-10-25)  remove cast-away-const to avoid warnings
+//     0.09  (2016-08-27)  fix compiler warnings
+//     0.08  (2015-09-13)  really fix bug with empty rects (w=0 or h=0)
+//     0.07  (2015-09-13)  fix bug with empty rects (w=0 or h=0)
+//     0.06  (2015-04-15)  added STBRP_SORT to allow replacing qsort
+//     0.05:  added STBRP_ASSERT to allow replacing assert
+//     0.04:  fixed minor bug in STBRP_LARGE_RECTS support
+//     0.01:  initial release
+//
+// LICENSE
+//
+//   See end of file for license information.
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//       INCLUDE SECTION
+//
+
+#ifndef STB_INCLUDE_STB_RECT_PACK_H
+#define STB_INCLUDE_STB_RECT_PACK_H
+
+#define STB_RECT_PACK_VERSION  1
+
+#ifdef STBRP_STATIC
+    #define STBRP_DEF static
+#else
+    #define STBRP_DEF extern
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/// @cond
+/**
+ *  Tells Doxygen to ignore a duplicate declaration
+ */
+typedef struct stbrp_context stbrp_context;
+typedef struct stbrp_node    stbrp_node;
+typedef struct stbrp_rect    stbrp_rect;
+/// @endcond
+
+typedef int            stbrp_coord;
+
+#define STBRP__MAXVAL  0x7fffffff
+// Mostly for internal use, but this is the maximum supported coordinate value.
+
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+#endif
+
+
+STBRP_DEF int stbrp_pack_rects(stbrp_context * context, stbrp_rect * rects, int num_rects);
+// Assign packed locations to rectangles. The rectangles are of type
+// 'stbrp_rect' defined below, stored in the array 'rects', and there
+// are 'num_rects' many of them.
+//
+// Rectangles which are successfully packed have the 'was_packed' flag
+// set to a non-zero value and 'x' and 'y' store the minimum location
+// on each axis (i.e. bottom-left in cartesian coordinates, top-left
+// if you imagine y increasing downwards). Rectangles which do not fit
+// have the 'was_packed' flag set to 0.
+//
+// You should not try to access the 'rects' array from another thread
+// while this function is running, as the function temporarily reorders
+// the array while it executes.
+//
+// To pack into another rectangle, you need to call stbrp_init_target
+// again. To continue packing into the same rectangle, you can call
+// this function again. Calling this multiple times with multiple rect
+// arrays will probably produce worse packing results than calling it
+// a single time with the full rectangle array, but the option is
+// available.
+//
+// The function returns 1 if all of the rectangles were successfully
+// packed and 0 otherwise.
+
+struct stbrp_rect {
+    // reserved for your use:
+    int            id;
+
+    // input:
+    stbrp_coord    w, h;
+
+    // output:
+    stbrp_coord    x, y;
+    int            was_packed;  // non-zero if valid packing
+
+}; // 16 bytes, nominally
+
+
+STBRP_DEF void stbrp_init_target(stbrp_context * context, int width, int height, stbrp_node * nodes, int num_nodes);
+// Initialize a rectangle packer to:
+//    pack a rectangle that is 'width' by 'height' in dimensions
+//    using temporary storage provided by the array 'nodes', which is 'num_nodes' long
+//
+// You must call this function every time you start packing into a new target.
+//
+// There is no "shutdown" function. The 'nodes' memory must stay valid for
+// the following stbrp_pack_rects() call (or calls), but can be freed after
+// the call (or calls) finish.
+//
+// Note: to guarantee best results, either:
+//       1. make sure 'num_nodes' >= 'width'
+//   or  2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
+//
+// If you don't do either of the above things, widths will be quantized to multiples
+// of small integers to guarantee the algorithm doesn't run out of temporary storage.
+//
+// If you do #2, then the non-quantized algorithm will be used, but the algorithm
+// may run out of temporary storage and be unable to pack some rectangles.
+
+STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context * context, int allow_out_of_mem);
+// Optionally call this function after init but before doing any packing to
+// change the handling of the out-of-temp-memory scenario, described above.
+// If you call init again, this will be reset to the default (false).
+
+
+STBRP_DEF void stbrp_setup_heuristic(stbrp_context * context, int heuristic);
+// Optionally select which packing heuristic the library should use. Different
+// heuristics will produce better/worse results for different data sets.
+// If you call init again, this will be reset to the default.
+
+enum {
+    STBRP_HEURISTIC_Skyline_default = 0,
+    STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default,
+    STBRP_HEURISTIC_Skyline_BF_sortHeight
+};
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// the details of the following structures don't matter to you, but they must
+// be visible so you can handle the memory allocations for them
+
+struct stbrp_node {
+    stbrp_coord  x, y;
+    stbrp_node * next;
+};
+
+struct stbrp_context {
+    int width;
+    int height;
+    int align;
+    int init_mode;
+    int heuristic;
+    int num_nodes;
+    stbrp_node * active_head;
+    stbrp_node * free_head;
+    stbrp_node extra[2]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2'
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//     IMPLEMENTATION SECTION
+//
+
+#ifdef STB_RECT_PACK_IMPLEMENTATION
+#ifndef STBRP_SORT
+    #include <stdlib.h>
+    #define STBRP_SORT qsort
+#endif
+
+#ifndef STBRP_ASSERT
+    #include <assert.h>
+    #define STBRP_ASSERT assert
+#endif
+
+#ifdef _MSC_VER
+    #define STBRP__NOTUSED(v)  (void)(v)
+    #define STBRP__CDECL       __cdecl
+#else
+    #define STBRP__NOTUSED(v)  (void)sizeof(v)
+    #define STBRP__CDECL
+#endif
+
+enum {
+    STBRP__INIT_skyline = 1
+};
+
+STBRP_DEF void stbrp_setup_heuristic(stbrp_context * context, int heuristic)
+{
+    switch(context->init_mode) {
+        case STBRP__INIT_skyline:
+            STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight);
+            context->heuristic = heuristic;
+            break;
+        default:
+            STBRP_ASSERT(0);
+    }
+}
+
+STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context * context, int allow_out_of_mem)
+{
+    if(allow_out_of_mem)
+        // if it's ok to run out of memory, then don't bother aligning them;
+        // this gives better packing, but may fail due to OOM (even though
+        // the rectangles easily fit). @TODO a smarter approach would be to only
+        // quantize once we've hit OOM, then we could get rid of this parameter.
+        context->align = 1;
+    else {
+        // if it's not ok to run out of memory, then quantize the widths
+        // so that num_nodes is always enough nodes.
+        //
+        // I.e. num_nodes * align >= width
+        //                  align >= width / num_nodes
+        //                  align = ceil(width/num_nodes)
+
+        context->align = (context->width + context->num_nodes - 1) / context->num_nodes;
+    }
+}
+
+STBRP_DEF void stbrp_init_target(stbrp_context * context, int width, int height, stbrp_node * nodes, int num_nodes)
+{
+    int i;
+
+    for(i = 0; i < num_nodes - 1; ++i)
+        nodes[i].next = &nodes[i + 1];
+    nodes[i].next = NULL;
+    context->init_mode = STBRP__INIT_skyline;
+    context->heuristic = STBRP_HEURISTIC_Skyline_default;
+    context->free_head = &nodes[0];
+    context->active_head = &context->extra[0];
+    context->width = width;
+    context->height = height;
+    context->num_nodes = num_nodes;
+    stbrp_setup_allow_out_of_mem(context, 0);
+
+    // node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
+    context->extra[0].x = 0;
+    context->extra[0].y = 0;
+    context->extra[0].next = &context->extra[1];
+    context->extra[1].x = (stbrp_coord) width;
+    context->extra[1].y = (1 << 30);
+    context->extra[1].next = NULL;
+}
+
+// find minimum y position if it starts at x1
+static int stbrp__skyline_find_min_y(stbrp_context * c, stbrp_node * first, int x0, int width, int * pwaste)
+{
+    stbrp_node * node = first;
+    int x1 = x0 + width;
+    int min_y, visited_width, waste_area;
+
+    STBRP__NOTUSED(c);
+
+    STBRP_ASSERT(first->x <= x0);
+
+#if 0
+    // skip in case we're past the node
+    while(node->next->x <= x0)
+        ++node;
+#else
+    STBRP_ASSERT(node->next->x > x0); // we ended up handling this in the caller for efficiency
+#endif
+
+    STBRP_ASSERT(node->x <= x0);
+
+    min_y = 0;
+    waste_area = 0;
+    visited_width = 0;
+    while(node->x < x1) {
+        if(node->y > min_y) {
+            // raise min_y higher.
+            // we've accounted for all waste up to min_y,
+            // but we'll now add more waste for everything we've visited
+            waste_area += visited_width * (node->y - min_y);
+            min_y = node->y;
+            // the first time through, visited_width might be reduced
+            if(node->x < x0)
+                visited_width += node->next->x - x0;
+            else
+                visited_width += node->next->x - node->x;
+        }
+        else {
+            // add waste area
+            int under_width = node->next->x - node->x;
+            if(under_width + visited_width > width)
+                under_width = width - visited_width;
+            waste_area += under_width * (min_y - node->y);
+            visited_width += under_width;
+        }
+        node = node->next;
+    }
+
+    *pwaste = waste_area;
+    return min_y;
+}
+
+typedef struct {
+    int x, y;
+    stbrp_node ** prev_link;
+} stbrp__findresult;
+
+static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context * c, int width, int height)
+{
+    int best_waste = (1 << 30), best_x, best_y = (1 << 30);
+    stbrp__findresult fr;
+    stbrp_node ** prev, * node, * tail, ** best = NULL;
+
+    // align to multiple of c->align
+    width = (width + c->align - 1);
+    width -= width % c->align;
+    STBRP_ASSERT(width % c->align == 0);
+
+    // if it can't possibly fit, bail immediately
+    if(width > c->width || height > c->height) {
+        fr.prev_link = NULL;
+        fr.x = fr.y = 0;
+        return fr;
+    }
+
+    node = c->active_head;
+    prev = &c->active_head;
+    while(node->x + width <= c->width) {
+        int y, waste;
+        y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste);
+        if(c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) {  // actually just want to test BL
+            // bottom left
+            if(y < best_y) {
+                best_y = y;
+                best = prev;
+            }
+        }
+        else {
+            // best-fit
+            if(y + height <= c->height) {
+                // can only use it if it first vertically
+                if(y < best_y || (y == best_y && waste < best_waste)) {
+                    best_y = y;
+                    best_waste = waste;
+                    best = prev;
+                }
+            }
+        }
+        prev = &node->next;
+        node = node->next;
+    }
+
+    best_x = (best == NULL) ? 0 : (*best)->x;
+
+    // if doing best-fit (BF), we also have to try aligning right edge to each node position
+    //
+    // e.g, if fitting
+    //
+    //     ____________________
+    //    |____________________|
+    //
+    //            into
+    //
+    //   |                         |
+    //   |             ____________|
+    //   |____________|
+    //
+    // then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
+    //
+    // This makes BF take about 2x the time
+
+    if(c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) {
+        tail = c->active_head;
+        node = c->active_head;
+        prev = &c->active_head;
+        // find first node that's admissible
+        while(tail->x < width)
+            tail = tail->next;
+        while(tail) {
+            int xpos = tail->x - width;
+            int y, waste;
+            STBRP_ASSERT(xpos >= 0);
+            // find the left position that matches this
+            while(node->next->x <= xpos) {
+                prev = &node->next;
+                node = node->next;
+            }
+            STBRP_ASSERT(node->next->x > xpos && node->x <= xpos);
+            y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste);
+            if(y + height <= c->height) {
+                if(y <= best_y) {
+                    if(y < best_y || waste < best_waste || (waste == best_waste && xpos < best_x)) {
+                        best_x = xpos;
+                        STBRP_ASSERT(y <= best_y);
+                        best_y = y;
+                        best_waste = waste;
+                        best = prev;
+                    }
+                }
+            }
+            tail = tail->next;
+        }
+    }
+
+    fr.prev_link = best;
+    fr.x = best_x;
+    fr.y = best_y;
+    return fr;
+}
+
+static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context * context, int width, int height)
+{
+    // find best position according to heuristic
+    stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
+    stbrp_node * node, * cur;
+
+    // bail if:
+    //    1. it failed
+    //    2. the best node doesn't fit (we don't always check this)
+    //    3. we're out of memory
+    if(res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
+        res.prev_link = NULL;
+        return res;
+    }
+
+    // on success, create new node
+    node = context->free_head;
+    node->x = (stbrp_coord) res.x;
+    node->y = (stbrp_coord)(res.y + height);
+
+    context->free_head = node->next;
+
+    // insert the new node into the right starting point, and
+    // let 'cur' point to the remaining nodes needing to be
+    // stiched back in
+
+    cur = *res.prev_link;
+    if(cur->x < res.x) {
+        // preserve the existing one, so start testing with the next one
+        stbrp_node * next = cur->next;
+        cur->next = node;
+        cur = next;
+    }
+    else {
+        *res.prev_link = node;
+    }
+
+    // from here, traverse cur and free the nodes, until we get to one
+    // that shouldn't be freed
+    while(cur->next && cur->next->x <= res.x + width) {
+        stbrp_node * next = cur->next;
+        // move the current node to the free list
+        cur->next = context->free_head;
+        context->free_head = cur;
+        cur = next;
+    }
+
+    // stitch the list back in
+    node->next = cur;
+
+    if(cur->x < res.x + width)
+        cur->x = (stbrp_coord)(res.x + width);
+
+#ifdef _DEBUG
+    cur = context->active_head;
+    while(cur->x < context->width) {
+        STBRP_ASSERT(cur->x < cur->next->x);
+        cur = cur->next;
+    }
+    STBRP_ASSERT(cur->next == NULL);
+
+    {
+        int count = 0;
+        cur = context->active_head;
+        while(cur) {
+            cur = cur->next;
+            ++count;
+        }
+        cur = context->free_head;
+        while(cur) {
+            cur = cur->next;
+            ++count;
+        }
+        STBRP_ASSERT(count == context->num_nodes + 2);
+    }
+#endif
+
+    return res;
+}
+
+static int STBRP__CDECL rect_height_compare(const void * a, const void * b)
+{
+    const stbrp_rect * p = (const stbrp_rect *) a;
+    const stbrp_rect * q = (const stbrp_rect *) b;
+    if(p->h > q->h)
+        return -1;
+    if(p->h < q->h)
+        return  1;
+    return (p->w > q->w) ? -1 : (p->w < q->w);
+}
+
+static int STBRP__CDECL rect_original_order(const void * a, const void * b)
+{
+    const stbrp_rect * p = (const stbrp_rect *) a;
+    const stbrp_rect * q = (const stbrp_rect *) b;
+    return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
+}
+
+STBRP_DEF int stbrp_pack_rects(stbrp_context * context, stbrp_rect * rects, int num_rects)
+{
+    int i, all_rects_packed = 1;
+
+    // we use the 'was_packed' field internally to allow sorting/unsorting
+    for(i = 0; i < num_rects; ++i) {
+        rects[i].was_packed = i;
+    }
+
+    // sort according to heuristic
+    STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
+
+    for(i = 0; i < num_rects; ++i) {
+        if(rects[i].w == 0 || rects[i].h == 0) {
+            rects[i].x = rects[i].y = 0;  // empty rect needs no space
+        }
+        else {
+            stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
+            if(fr.prev_link) {
+                rects[i].x = (stbrp_coord) fr.x;
+                rects[i].y = (stbrp_coord) fr.y;
+            }
+            else {
+                rects[i].x = rects[i].y = STBRP__MAXVAL;
+            }
+        }
+    }
+
+    // unsort
+    STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
+
+    // set was_packed flags and all_rects_packed status
+    for(i = 0; i < num_rects; ++i) {
+        rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
+        if(!rects[i].was_packed)
+            all_rects_packed = 0;
+    }
+
+    // return the all_rects_packed status
+    return all_rects_packed;
+}
+#endif
+
+#if defined(__GNUC__) || defined(__clang__)
+    #pragma GCC diagnostic pop
+#endif
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/

src/extra/lv_extra.c

@@ -50,6 +50,10 @@ void lv_extra_init(void)
     lv_fs_fatfs_init();
 #endif
 
+#if LV_USE_FS_LITTLEFS != '\0'
+    lv_fs_littlefs_init();
+#endif
+
 #if LV_USE_FS_STDIO != '\0'
     lv_fs_stdio_init();
 #endif

src/extra/lv_extra.mk

@@ -1 +1 @@
-CSRCS += $(shell find -L $(LVGL_DIR)/$(LVGL_DIR_NAME)/src/extra -name \*.c)
+CSRCS += $(shell find -L $(LVGL_DIR)/$(LVGL_DIR_NAME)/src/extra -name "*.c")

src/extra/others/ime/lv_ime_pinyin.c

@@ -562,6 +562,8 @@ static void lv_ime_pinyin_constructor(const lv_obj_class_t * class_p, lv_obj_t *
     lv_memset_00(pinyin_ime->py_num, sizeof(pinyin_ime->py_num));
     lv_memset_00(pinyin_ime->py_pos, sizeof(pinyin_ime->py_pos));
 
+    lv_obj_add_flag(obj, LV_OBJ_FLAG_HIDDEN);
+
     lv_obj_set_size(obj, LV_PCT(100), LV_PCT(55));
     lv_obj_align(obj, LV_ALIGN_BOTTOM_MID, 0, 0);
 
@@ -576,6 +578,7 @@ static void lv_ime_pinyin_constructor(const lv_obj_class_t * class_p, lv_obj_t *
     lv_obj_add_flag(pinyin_ime->cand_panel, LV_OBJ_FLAG_HIDDEN);
 
     lv_btnmatrix_set_one_checked(pinyin_ime->cand_panel, true);
+    lv_obj_clear_flag(pinyin_ime->cand_panel, LV_OBJ_FLAG_CLICK_FOCUSABLE);
 
     /* Set cand_panel style*/
     // Default style

src/extra/widgets/keyboard/lv_keyboard.c

@@ -73,7 +73,7 @@ static const lv_btnmatrix_ctrl_t default_kb_ctrl_uc_map[] = {
 };
 
 static const char * const default_kb_map_spec[] = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "0", LV_SYMBOL_BACKSPACE, "\n",
-                                                   "abc", "+", "-", "/", "*", "=", "%", "!", "?", "#", "<", ">", "\n",
+                                                   "abc", "+", "&", "/", "*", "=", "%", "!", "?", "#", "<", ">", "\n",
                                                    "\\",  "@", "$", "(", ")", "{", "}", "[", "]", ";", "\"", "'", "\n",
                                                    LV_SYMBOL_KEYBOARD, LV_SYMBOL_LEFT, " ", LV_SYMBOL_RIGHT, LV_SYMBOL_OK, ""
                                                   };

src/extra/widgets/meter/lv_meter.c

@@ -336,7 +336,7 @@ static void draw_arcs(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx, const lv_area_t
     scale_center.x = scale_area->x1 + r_out;
     scale_center.y = scale_area->y1 + r_out;
 
-    lv_opa_t opa_main = lv_obj_get_style_opa(obj, LV_PART_MAIN);
+    lv_opa_t opa_main = lv_obj_get_style_opa_recursive(obj, LV_PART_MAIN);
     lv_meter_indicator_t * indic;
 
     lv_obj_draw_part_dsc_t part_draw_dsc;
@@ -360,6 +360,8 @@ static void draw_arcs(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx, const lv_area_t
         int32_t end_angle = lv_map(indic->end_value, scale->min, scale->max, scale->rotation,
                                    scale->rotation + scale->angle_range);
 
+        arc_dsc.start_angle = start_angle;
+        arc_dsc.end_angle = end_angle;
         part_draw_dsc.radius = r_out + indic->type_data.arc.r_mod;
         part_draw_dsc.sub_part_ptr = indic;
         part_draw_dsc.p1 = &scale_center;
@@ -511,7 +513,8 @@ static void draw_ticks_and_labels(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx, cons
                 lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
 
                 lv_point_t label_size;
-                lv_txt_get_size(&label_size, part_draw_dsc.text, label_dsc.font, label_dsc.letter_space, label_dsc.line_space,
+                lv_txt_get_size(&label_size, part_draw_dsc.text, label_dsc_tmp.font, label_dsc_tmp.letter_space,
+                                label_dsc_tmp.line_space,
                                 LV_COORD_MAX, LV_TEXT_FLAG_NONE);
 
                 lv_area_t label_cord;
@@ -563,12 +566,13 @@ static void draw_needles(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx, const lv_area
     lv_draw_img_dsc_t img_dsc;
     lv_draw_img_dsc_init(&img_dsc);
     lv_obj_init_draw_img_dsc(obj, LV_PART_ITEMS, &img_dsc);
-    lv_opa_t opa_main = lv_obj_get_style_opa(obj, LV_PART_MAIN);
+    lv_opa_t opa_main = lv_obj_get_style_opa_recursive(obj, LV_PART_MAIN);
 
     lv_obj_draw_part_dsc_t part_draw_dsc;
     lv_obj_draw_dsc_init(&part_draw_dsc, draw_ctx);
     part_draw_dsc.class_p = MY_CLASS;
     part_draw_dsc.p1 = &scale_center;
+    part_draw_dsc.part = LV_PART_INDICATOR;
 
     lv_meter_indicator_t * indic;
     _LV_LL_READ_BACK(&meter->indicator_ll, indic) {
@@ -585,12 +589,12 @@ static void draw_needles(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx, const lv_area
             line_dsc.width = indic->type_data.needle_line.width;
             line_dsc.opa = indic->opa > LV_OPA_MAX ? opa_main : (opa_main * indic->opa) >> 8;
 
-            part_draw_dsc.id = LV_METER_DRAW_PART_NEEDLE_LINE;
+            part_draw_dsc.type = LV_METER_DRAW_PART_NEEDLE_LINE;
             part_draw_dsc.line_dsc = &line_dsc;
             part_draw_dsc.p2 = &p_end;
-
+            part_draw_dsc.p1 = &scale_center;
             lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);
-            lv_draw_line(draw_ctx, &line_dsc, &scale_center, &p_end);
+            lv_draw_line(draw_ctx, &line_dsc, part_draw_dsc.p1, &p_end);
             lv_event_send(obj, LV_EVENT_DRAW_PART_END, &part_draw_dsc);
         }
         else if(indic->type == LV_METER_INDICATOR_TYPE_NEEDLE_IMG) {
@@ -612,7 +616,7 @@ static void draw_needles(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx, const lv_area
             if(angle > 3600) angle -= 3600;
             img_dsc.angle = angle;
 
-            part_draw_dsc.id = LV_METER_DRAW_PART_NEEDLE_IMG;
+            part_draw_dsc.type = LV_METER_DRAW_PART_NEEDLE_IMG;
             part_draw_dsc.img_dsc = &img_dsc;
 
             lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &part_draw_dsc);

src/extra/widgets/meter/lv_meter.h

@@ -42,7 +42,6 @@ typedef struct {
     uint16_t tick_major_width;
 
     int16_t label_gap;
-    int16_t label_color;
 
     int32_t min;
     int32_t max;

src/extra/widgets/span/lv_span.c

@@ -779,7 +779,7 @@ static void lv_draw_span(lv_obj_t * obj, lv_draw_ctx_t * draw_ctx)
     lv_coord_t max_width = lv_area_get_width(&coords);
     lv_coord_t indent = convert_indent_pct(obj, max_width);
     lv_coord_t max_w  = max_width - indent; /* first line need minus indent */
-    lv_opa_t obj_opa = lv_obj_get_style_opa(obj, LV_PART_MAIN);
+    lv_opa_t obj_opa = lv_obj_get_style_opa_recursive(obj, LV_PART_MAIN);
 
     /* coords of draw span-txt */
     lv_point_t txt_pos;

src/hal/lv_hal_disp.c

@@ -186,6 +186,8 @@ lv_disp_t * lv_disp_drv_register(lv_disp_drv_t * driver)
 
     disp->inv_en_cnt = 1;
 
+    _lv_ll_init(&disp->sync_areas, sizeof(lv_area_t));
+
     lv_disp_t * disp_def_tmp = disp_def;
     disp_def                 = disp; /*Temporarily change the default screen to create the default screens on the
                                         new display*/
@@ -316,6 +318,7 @@ void lv_disp_remove(lv_disp_t * disp)
     }
 
     _lv_ll_remove(&LV_GC_ROOT(_lv_disp_ll), disp);
+    _lv_ll_clear(&disp->sync_areas);
     if(disp->refr_timer) lv_timer_del(disp->refr_timer);
     lv_mem_free(disp);
 

src/hal/lv_hal_disp.h

@@ -23,6 +23,7 @@ extern "C" {
 #include "../misc/lv_area.h"
 #include "../misc/lv_ll.h"
 #include "../misc/lv_timer.h"
+#include "../misc/lv_ll.h"
 
 /*********************
  *      DEFINES
@@ -187,6 +188,9 @@ typedef struct _lv_disp_t {
     uint16_t inv_p;
     int32_t inv_en_cnt;
 
+    /** Double buffer sync areas */
+    lv_ll_t sync_areas;
+
     /*Miscellaneous data*/
     uint32_t last_activity_time;        /**< Last time when there was activity on this display*/
 } lv_disp_t;

src/lv_conf_internal.h

@@ -2099,6 +2099,31 @@
     #endif
 #endif
 
+/*API for LittleFS (library needs to be added separately). Uses lfs_file_open, lfs_file_read, etc*/
+#ifndef LV_USE_FS_LITTLEFS
+    #ifdef CONFIG_LV_USE_FS_LITTLEFS
+        #define LV_USE_FS_LITTLEFS CONFIG_LV_USE_FS_LITTLEFS
+    #else
+        #define LV_USE_FS_LITTLEFS 0
+    #endif
+#endif
+#if LV_USE_FS_LITTLEFS
+    #ifndef LV_FS_LITTLEFS_LETTER
+        #ifdef CONFIG_LV_FS_LITTLEFS_LETTER
+            #define LV_FS_LITTLEFS_LETTER CONFIG_LV_FS_LITTLEFS_LETTER
+        #else
+            #define LV_FS_LITTLEFS_LETTER '\0'     /*Set an upper cased letter on which the drive will accessible (e.g. 'A')*/
+        #endif
+    #endif
+    #ifndef LV_FS_LITTLEFS_CACHE_SIZE
+        #ifdef CONFIG_LV_FS_LITTLEFS_CACHE_SIZE
+            #define LV_FS_LITTLEFS_CACHE_SIZE CONFIG_LV_FS_LITTLEFS_CACHE_SIZE
+        #else
+            #define LV_FS_LITTLEFS_CACHE_SIZE 0    /*>0 to cache this number of bytes in lv_fs_read()*/
+        #endif
+    #endif
+#endif
+
 /*PNG decoder library*/
 #ifndef LV_USE_PNG
     #ifdef CONFIG_LV_USE_PNG
@@ -2192,6 +2217,25 @@
     #endif
 #endif
 
+/*Tiny TTF library*/
+#ifndef LV_USE_TINY_TTF
+    #ifdef CONFIG_LV_USE_TINY_TTF
+        #define LV_USE_TINY_TTF CONFIG_LV_USE_TINY_TTF
+    #else
+        #define LV_USE_TINY_TTF 0
+    #endif
+#endif
+#if LV_USE_TINY_TTF
+    /*Load TTF data from files*/
+    #ifndef LV_TINY_TTF_FILE_SUPPORT
+        #ifdef CONFIG_LV_TINY_TTF_FILE_SUPPORT
+            #define LV_TINY_TTF_FILE_SUPPORT CONFIG_LV_TINY_TTF_FILE_SUPPORT
+        #else
+            #define LV_TINY_TTF_FILE_SUPPORT 0
+        #endif
+    #endif
+#endif
+
 /*Rlottie library*/
 #ifndef LV_USE_RLOTTIE
     #ifdef CONFIG_LV_USE_RLOTTIE

src/misc/lv_area.c

@@ -143,6 +143,78 @@ bool _lv_area_intersect(lv_area_t * res_p, const lv_area_t * a1_p, const lv_area
     return union_ok;
 }
 
+/**
+ * Get resulting sub areas after removing the common parts of two areas from the first area
+ * @param res_p pointer to an array of areas with a count of 4, the resulting areas will be stored here
+ * @param a1_p pointer to the first area
+ * @param a2_p pointer to the second area
+ * @return number of results or -1 if no intersect
+ */
+int8_t _lv_area_diff(lv_area_t * res_p, const lv_area_t * a1_p, const lv_area_t * a2_p)
+{
+    /*Areas have no common parts*/
+    if(!_lv_area_is_on(a1_p, a2_p)) return -1;
+
+    /*No remaining areas after removing common parts*/
+    if(_lv_area_is_in(a1_p, a2_p, 0)) return 0;
+
+    /*Result counter*/
+    int8_t res_c = 0;
+
+    /*Get required information*/
+    lv_area_t n;
+    lv_coord_t a1_w = lv_area_get_width(a1_p) - 1;
+    lv_coord_t a1_h = lv_area_get_height(a1_p) - 1;
+
+    /*Compute top rectangle*/
+    lv_coord_t th = a2_p->y1 - a1_p->y1;
+    if(th > 0) {
+        n.x1 = a1_p->x1;
+        n.y1 = a1_p->y1;
+        n.x2 = a1_p->x2;
+        n.y2 = a1_p->y1 + th;
+        res_p[res_c++] = n;
+    }
+
+    /*Compute the bottom rectangle*/
+    lv_coord_t bh = a1_h - (a2_p->y2 - a1_p->y1);
+    if(bh > 0 && a2_p->y2 < a1_p->y2) {
+        n.x1 = a1_p->x1;
+        n.y1 = a2_p->y2;
+        n.x2 = a1_p->x2;
+        n.y2 = a2_p->y2 + bh;
+        res_p[res_c++] = n;
+    }
+
+    /*Compute side height*/
+    lv_coord_t y1 = a2_p->y1 > a1_p->y1 ? a2_p->y1 : a1_p->y1;
+    lv_coord_t y2 = a2_p->y2 < a1_p->y2 ? a2_p->y2 : a1_p->y2;
+    lv_coord_t sh = y2 - y1;
+
+    /*Compute the left rectangle*/
+    lv_coord_t lw = a2_p->x1 - a1_p->x1;
+    if(lw > 0 && sh > 0) {
+        n.x1 = a1_p->x1;
+        n.y1 = y1;
+        n.x2 = a1_p->x1 + lw;
+        n.y2 = y1 + sh;
+        res_p[res_c++] = n;
+    }
+
+    /*Compute the right rectangle*/
+    lv_coord_t rw = a1_w - (a2_p->x2 - a1_p->x1);
+    if(rw > 0) {
+        n.x1 = a2_p->x2;
+        n.y1 = y1;
+        n.x2 = a2_p->x2 + rw;
+        n.y2 = y1 + sh;
+        res_p[res_c++] = n;
+    }
+
+    //Return number of results
+    return res_c;
+}
+
 /**
  * Join two areas into a third which involves the other two
  * @param res_p pointer to an area, the result will be stored here

src/misc/lv_area.h

@@ -177,6 +177,15 @@ void lv_area_move(lv_area_t * area, lv_coord_t x_ofs, lv_coord_t y_ofs);
  */
 bool _lv_area_intersect(lv_area_t * res_p, const lv_area_t * a1_p, const lv_area_t * a2_p);
 
+/**
+ * Get resulting sub areas after removing the common parts of two areas from the first area
+ * @param res_p pointer to an array of areas with a count of 4, the resulting areas will be stored here
+ * @param a1_p pointer to the first area
+ * @param a2_p pointer to the second area
+ * @return number of results (max 4) or -1 if no intersect
+ */
+int8_t _lv_area_diff(lv_area_t * res_p, const lv_area_t * a1_p, const lv_area_t * a2_p);
+
 /**
  * Join two areas into a third which involves the other two
  * @param res_p pointer to an area, the result will be stored here

src/misc/lv_fs.h

@@ -57,7 +57,6 @@ enum {
 };
 typedef uint8_t lv_fs_mode_t;
 
-
 /**
  * Seek modes.
  */

src/misc/lv_printf.h

@@ -40,14 +40,20 @@
         /* platform-specific printf format for int32_t, usually "d" or "ld" */
         #define LV_PRId32 PRId32
         #define LV_PRIu32 PRIu32
+        #define LV_PRIx32 PRIx32
+        #define LV_PRIX32 PRIX32
     #else
         #define LV_PRId32 "d"
         #define LV_PRIu32 "u"
+        #define LV_PRIx32 "x"
+        #define LV_PRIX32 "X"
     #endif
 #else
     /* hope this is correct for ports without __has_include or without inttypes.h */
     #define LV_PRId32 "d"
     #define LV_PRIu32 "u"
+    #define LV_PRIx32 "x"
+    #define LV_PRIX32 "X"
 #endif
 
 #ifdef __cplusplus

src/misc/lv_style.c

@@ -119,7 +119,8 @@ const uint8_t _lv_style_builtin_prop_flag_lookup_table[_LV_STYLE_NUM_BUILT_IN_PR
 
     [LV_STYLE_RADIUS] = 0,
     [LV_STYLE_CLIP_CORNER] = 0,
-    [LV_STYLE_OPA] =                       LV_STYLE_PROP_LAYER_REFR,
+    [LV_STYLE_OPA] =                       0,
+    [LV_STYLE_OPA_LAYERED] =               LV_STYLE_PROP_LAYER_REFR,
     [LV_STYLE_COLOR_FILTER_DSC] =          LV_STYLE_PROP_INHERIT,
     [LV_STYLE_COLOR_FILTER_OPA] =          LV_STYLE_PROP_INHERIT,
     [LV_STYLE_ANIM_TIME] = 0,
@@ -330,6 +331,7 @@ lv_style_value_t lv_style_prop_get_default(lv_style_prop_t prop)
             value.color = lv_color_black();
             break;
         case LV_STYLE_OPA:
+        case LV_STYLE_OPA_LAYERED:
         case LV_STYLE_BORDER_OPA:
         case LV_STYLE_TEXT_OPA:
         case LV_STYLE_IMG_OPA:

src/misc/lv_style.h

@@ -260,23 +260,24 @@ typedef enum {
 
     /*Group 6*/
     LV_STYLE_OPA                    = 96,
-    LV_STYLE_COLOR_FILTER_DSC       = 97,
-    LV_STYLE_COLOR_FILTER_OPA       = 98,
-    LV_STYLE_ANIM                   = 99,
-    LV_STYLE_ANIM_TIME              = 100,
-    LV_STYLE_ANIM_SPEED             = 101,
-    LV_STYLE_TRANSITION             = 102,
-    LV_STYLE_BLEND_MODE             = 103,
-    LV_STYLE_TRANSFORM_WIDTH        = 104,
-    LV_STYLE_TRANSFORM_HEIGHT       = 105,
-    LV_STYLE_TRANSLATE_X            = 106,
-    LV_STYLE_TRANSLATE_Y            = 107,
-    LV_STYLE_TRANSFORM_ZOOM         = 108,
-    LV_STYLE_TRANSFORM_ANGLE        = 109,
-    LV_STYLE_TRANSFORM_PIVOT_X      = 110,
-    LV_STYLE_TRANSFORM_PIVOT_Y      = 111,
+    LV_STYLE_OPA_LAYERED            = 97,
+    LV_STYLE_COLOR_FILTER_DSC       = 98,
+    LV_STYLE_COLOR_FILTER_OPA       = 99,
+    LV_STYLE_ANIM                   = 100,
+    LV_STYLE_ANIM_TIME              = 101,
+    LV_STYLE_ANIM_SPEED             = 102,
+    LV_STYLE_TRANSITION             = 103,
+    LV_STYLE_BLEND_MODE             = 104,
+    LV_STYLE_TRANSFORM_WIDTH        = 105,
+    LV_STYLE_TRANSFORM_HEIGHT       = 106,
+    LV_STYLE_TRANSLATE_X            = 107,
+    LV_STYLE_TRANSLATE_Y            = 108,
+    LV_STYLE_TRANSFORM_ZOOM         = 109,
+    LV_STYLE_TRANSFORM_ANGLE        = 110,
+    LV_STYLE_TRANSFORM_PIVOT_X      = 111,
+    LV_STYLE_TRANSFORM_PIVOT_Y      = 112,
 
-    _LV_STYLE_LAST_BUILT_IN_PROP     = 111,
+    _LV_STYLE_LAST_BUILT_IN_PROP     = 112,
     _LV_STYLE_NUM_BUILT_IN_PROPS     = _LV_STYLE_LAST_BUILT_IN_PROP + 1,
 
     LV_STYLE_PROP_ANY                = 0xFFFF,

src/misc/lv_style_gen.c

@@ -600,6 +600,14 @@ void lv_style_set_opa(lv_style_t * style, lv_opa_t value)
     lv_style_set_prop(style, LV_STYLE_OPA, v);
 }
 
+void lv_style_set_opa_layered(lv_style_t * style, lv_opa_t value)
+{
+    lv_style_value_t v = {
+        .num = (int32_t)value
+    };
+    lv_style_set_prop(style, LV_STYLE_OPA_LAYERED, v);
+}
+
 void lv_style_set_color_filter_dsc(lv_style_t * style, const lv_color_filter_dsc_t * value)
 {
     lv_style_value_t v = {

src/misc/lv_style_gen.h

@@ -73,6 +73,7 @@ void lv_style_set_text_align(lv_style_t * style, lv_text_align_t value);
 void lv_style_set_radius(lv_style_t * style, lv_coord_t value);
 void lv_style_set_clip_corner(lv_style_t * style, bool value);
 void lv_style_set_opa(lv_style_t * style, lv_opa_t value);
+void lv_style_set_opa_layered(lv_style_t * style, lv_opa_t value);
 void lv_style_set_color_filter_dsc(lv_style_t * style, const lv_color_filter_dsc_t * value);
 void lv_style_set_color_filter_opa(lv_style_t * style, lv_opa_t value);
 void lv_style_set_anim(lv_style_t * style, const lv_anim_t * value);
@@ -458,6 +459,11 @@ void lv_style_set_base_dir(lv_style_t * style, lv_base_dir_t value);
         .prop = LV_STYLE_OPA, .value = { .num = (int32_t)val } \
     }
 
+#define LV_STYLE_CONST_OPA_LAYERED(val) \
+    { \
+        .prop = LV_STYLE_OPA_LAYERED, .value = { .num = (int32_t)val } \
+    }
+
 #define LV_STYLE_CONST_COLOR_FILTER_DSC(val) \
     { \
         .prop = LV_STYLE_COLOR_FILTER_DSC, .value = { .ptr = val } \

src/widgets/lv_arc.c

@@ -21,6 +21,10 @@
 #define MY_CLASS &lv_arc_class
 
 #define VALUE_UNSET INT16_MIN
+#define CLICK_OUTSIDE_BG_ANGLES ((uint32_t) 0x00U)
+#define CLICK_INSIDE_BG_ANGLES  ((uint32_t) 0x01U)
+#define CLICK_CLOSER_TO_MAX_END ((uint32_t) 0x00U)
+#define CLICK_CLOSER_TO_MIN_END ((uint32_t) 0x01U)
 
 /**********************
  *      TYPEDEFS
@@ -40,6 +44,7 @@ static lv_coord_t get_angle(const lv_obj_t * obj);
 static void get_knob_area(lv_obj_t * arc, const lv_point_t * center, lv_coord_t r, lv_area_t * knob_area);
 static void value_update(lv_obj_t * arc);
 static lv_coord_t knob_get_extra_size(lv_obj_t * obj);
+static bool lv_arc_angle_within_bg_bounds(lv_obj_t * obj, const uint32_t angle, const uint32_t tolerance_deg);
 
 /**********************
  *  STATIC VARIABLES
@@ -399,6 +404,7 @@ static void lv_arc_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
     arc->chg_rate = 720;
     arc->last_tick = lv_tick_get();
     arc->last_angle = arc->indic_angle_end;
+    arc->in_out = CLICK_OUTSIDE_BG_ANGLES;
 
     lv_obj_add_flag(obj, LV_OBJ_FLAG_CLICKABLE);
     lv_obj_clear_flag(obj, LV_OBJ_FLAG_SCROLL_CHAIN | LV_OBJ_FLAG_SCROLLABLE);
@@ -478,29 +484,54 @@ static void lv_arc_event(const lv_obj_class_t * class_p, lv_event_t * e)
         angle -= arc->rotation;
         angle -= arc->bg_angle_start;  /*Make the angle relative to the start angle*/
 
+        /* If we click near the bg_angle_start the angle will be close to 360° instead of an small angle */
         if(angle < 0) angle += 360;
 
-        int16_t deg_range = bg_end - arc->bg_angle_start;
+        const uint32_t circumference = (uint32_t)((2U * r * 314U) / 100U);  /* Equivalent to: 2r * 3.14, avoiding floats */
+        const uint32_t tolerance_deg = (360U * LV_DPX(50U)) / circumference;
+        const uint32_t min_close_prev = (uint32_t) arc->min_close;
 
+        const bool is_angle_within_bg_bounds = lv_arc_angle_within_bg_bounds(obj, (uint32_t) angle, tolerance_deg);
+        if(!is_angle_within_bg_bounds) {
+            return;
+        }
+
+        int16_t deg_range = bg_end - arc->bg_angle_start;
         int16_t last_angle_rel = arc->last_angle - arc->bg_angle_start;
         int16_t delta_angle = angle - last_angle_rel;
 
-        /*Do not allow big jumps.
+        /*Do not allow big jumps (jumps bigger than 280°).
          *It's mainly to avoid jumping to the opposite end if the "dead" range between min. and max. is crossed.
          *Check which end was closer on the last valid press (arc->min_close) and prefer that end*/
         if(LV_ABS(delta_angle) > 280) {
             if(arc->min_close) angle = 0;
             else angle = deg_range;
         }
-        else {
-            if(angle < deg_range / 2)arc->min_close = 1;
-            else arc->min_close = 0;
+        /* Check if click was outside the background arc start and end angles */
+        else if(CLICK_OUTSIDE_BG_ANGLES == arc->in_out) {
+            if(arc->min_close) angle = -deg_range;
+            else angle = deg_range;
         }
+        else { /* Keep the angle value */ }
+
+        /* Prevent big jumps when the click goes from start to end angle in the invisible
+         * part of the background arc without being released */
+        if(((min_close_prev == CLICK_CLOSER_TO_MIN_END) && (arc->min_close == CLICK_CLOSER_TO_MAX_END))
+           && ((CLICK_OUTSIDE_BG_ANGLES == arc->in_out) && (LV_ABS(delta_angle) > 280))) {
+            angle = 0;
+        }
+        else if(((min_close_prev == CLICK_CLOSER_TO_MAX_END) && (arc->min_close == CLICK_CLOSER_TO_MIN_END))
+                && (CLICK_OUTSIDE_BG_ANGLES == arc->in_out)) {
+            angle = deg_range;
+        }
+        else { /* Keep the angle value */ }
 
         /*Calculate the slew rate limited angle based on change rate (degrees/sec)*/
         delta_angle = angle - last_angle_rel;
+
         uint32_t delta_tick = lv_tick_elaps(arc->last_tick);
-        int16_t delta_angle_max = (arc->chg_rate * delta_tick) / 1000;
+        /* delta_angle_max can never be signed. delta_tick is always signed, same for ch_rate */
+        const uint16_t delta_angle_max = (arc->chg_rate * delta_tick) / 1000;
 
         if(delta_angle > delta_angle_max) {
             delta_angle = delta_angle_max;
@@ -508,6 +539,7 @@ static void lv_arc_event(const lv_obj_class_t * class_p, lv_event_t * e)
         else if(delta_angle < -delta_angle_max) {
             delta_angle = -delta_angle_max;
         }
+        else { /* Nothing to do */ }
 
         angle = last_angle_rel + delta_angle; /*Apply the limited angle change*/
 
@@ -564,7 +596,7 @@ static void lv_arc_event(const lv_obj_class_t * class_p, lv_event_t * e)
         }
     }
     else if(code == LV_EVENT_HIT_TEST) {
-        lv_hit_test_info_t * info = lv_event_get_param(e);;
+        lv_hit_test_info_t * info = lv_event_get_param(e);
 
         lv_point_t p;
         lv_coord_t r;
@@ -868,4 +900,121 @@ static lv_coord_t knob_get_extra_size(lv_obj_t * obj)
     return LV_MAX(knob_shadow_size, knob_outline_size);
 }
 
+/**
+ * Check if angle is within arc background bounds
+ *
+ * In order to avoid unexpected value update of the arc value when the user clicks
+ * outside of the arc background we need to check if the angle (of the clicked point)
+ * is within the bounds of the background.
+ *
+ * A tolerance (extra room) also should be taken into consideration.
+ *
+ * E.g. Arc with start angle of 0° and end angle of 90°, the background is only visible in
+ * that range, from 90° to 360° the background is invisible. Click in 150° should not update
+ * the arc value, click within the arc angle range should.
+ *
+ * IMPORTANT NOTE: angle is always relative to bg_angle_start, e.g. if bg_angle_start is 30
+ * and we click a bit to the left, angle is 10, not the expected 40.
+ *
+ * @param obj   Pointer to lv_arc
+ * @param angle Angle to be checked
+ * @param tolerance_deg Tolerance
+ *
+ * @return true if angle is within arc background bounds, false otherwise
+ */
+static bool lv_arc_angle_within_bg_bounds(lv_obj_t * obj, const uint32_t angle, const uint32_t tolerance_deg)
+{
+    LV_ASSERT_OBJ(obj, MY_CLASS);
+    lv_arc_t * arc = (lv_arc_t *)obj;
+
+    uint32_t smaller_angle = 0;
+    uint32_t bigger_angle = 0;
+
+    /* Determine which background angle is smaller and bigger */
+    if(arc->bg_angle_start < arc->bg_angle_end) {
+        bigger_angle = arc->bg_angle_end;
+        smaller_angle = arc->bg_angle_start;
+    }
+    else {
+        bigger_angle = (360 - arc->bg_angle_start) + arc->bg_angle_end;
+        smaller_angle = 0;
+    }
+
+    /* Angle is between both background angles */
+    if((smaller_angle <= angle) && (angle <= bigger_angle)) {
+
+        if(((bigger_angle - smaller_angle) / 2U) >= angle) {
+            arc->min_close = 1;
+        }
+        else {
+            arc->min_close = 0;
+        }
+
+        arc->in_out = CLICK_INSIDE_BG_ANGLES;
+
+        return true;
+    }
+    /* Distance between background start and end angles is less than tolerance,
+     * consider the click inside the arc */
+    else if(((smaller_angle - tolerance_deg) <= 0U) &&
+            (360U - (bigger_angle + (smaller_angle - tolerance_deg)))) {
+
+        arc->min_close = 1;
+        arc->in_out = CLICK_INSIDE_BG_ANGLES;
+        return true;
+    }
+    else { /* Case handled below */ }
+
+    /* Legends:
+     * 0° = angle 0
+     * 360° = angle 360
+     * T: Tolerance
+     * A: Angle
+     * S: Arc background start angle
+     * E: Arc background end angle
+     *
+     * Start angle is bigger or equal to tolerance */
+    if((smaller_angle >= tolerance_deg)
+       /* (360° - T) --- A --- 360° */
+       && ((angle >= (360U - tolerance_deg)) && (angle <= 360U))) {
+
+        arc->min_close = 1;
+        arc->in_out = CLICK_OUTSIDE_BG_ANGLES;
+        return true;
+    }
+    /* Tolerance is bigger than bg start angle */
+    else if((smaller_angle < tolerance_deg)
+            /* (360° - (T - S)) --- A --- 360° */
+            && (((360U - (tolerance_deg - smaller_angle)) <= angle)) && (angle <= 360U)) {
+
+        arc->min_close = 1;
+        arc->in_out = CLICK_OUTSIDE_BG_ANGLES;
+        return true;
+    }
+    /* 360° is bigger than background end angle + tolerance */
+    else if((360U >= (bigger_angle + tolerance_deg))
+            /* E --- A --- (E + T) */
+            && ((bigger_angle <= (angle + smaller_angle)) &&
+                ((angle + smaller_angle) <= (bigger_angle + tolerance_deg)))) {
+
+        arc->min_close = 0;
+        arc->in_out = CLICK_OUTSIDE_BG_ANGLES;
+        return true;
+    }
+    /* Background end angle + tolerance is bigger than 360° and bg_start_angle + tolerance is not near 0° + ((bg_end_angle + tolerance) - 360°)
+     * Here we can assume background is not near 0° because of the first two initial checks */
+    else if((360U < (bigger_angle + tolerance_deg))
+            && (angle <= 0U + ((bigger_angle + tolerance_deg) - 360U)) && (angle > bigger_angle)) {
+
+        arc->min_close = 0;
+        arc->in_out = CLICK_OUTSIDE_BG_ANGLES;
+        return true;
+    }
+    else {
+        /* Nothing to do */
+    }
+
+    return false;
+}
+
 #endif

src/widgets/lv_arc.h

@@ -44,10 +44,11 @@ typedef struct {
     int16_t 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 min_close   : 1;   /*1: the last pressed angle was closer to minimum end*/
-    uint16_t chg_rate;          /*Drag angle rate of change of the arc (degrees/sec)*/
+    uint32_t dragging    : 1;
+    uint32_t type        : 2;
+    uint32_t min_close   : 1;   /*1: the last pressed angle was closer to minimum end*/
+    uint32_t in_out      : 1;   /* 1: The click was within the background arc angles. 0: Click outside */
+    uint32_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_t;

src/widgets/lv_btnmatrix.c

@@ -440,6 +440,7 @@ static void lv_btnmatrix_event(const lv_obj_class_t * class_p, lv_event_t * e)
             lv_indev_get_point(param, &p);
             btn_pr = get_button_from_point(obj, &p);
             /*Handle the case where there is no button there*/
+            btnm->btn_id_sel = LV_BTNMATRIX_BTN_NONE;
             if(btn_pr != LV_BTNMATRIX_BTN_NONE) {
                 if(button_is_inactive(btnm->ctrl_bits[btn_pr]) == false &&
                    button_is_hidden(btnm->ctrl_bits[btn_pr]) == false) {
@@ -447,6 +448,9 @@ static void lv_btnmatrix_event(const lv_obj_class_t * class_p, lv_event_t * e)
                     invalidate_button_area(obj, btnm->btn_id_sel); /*Invalidate the new area*/
                 }
             }
+            else {
+                btnm->btn_id_sel = LV_BTNMATRIX_BTN_NONE;
+            }
         }
 
         if(btnm->btn_id_sel != LV_BTNMATRIX_BTN_NONE) {

src/widgets/lv_checkbox.c

@@ -74,14 +74,16 @@ void lv_checkbox_set_text(lv_obj_t * obj, const char * txt)
     size_t len = strlen(txt);
 #endif
 
-    if(!cb->static_txt) cb->txt = lv_mem_realloc(cb->txt, len + 1);
-    else  cb->txt = lv_mem_alloc(len + 1);
+    char * _txt = (char *)cb->txt;
+    if(!cb->static_txt) _txt = lv_mem_realloc(_txt, len + 1);
+    else _txt = lv_mem_alloc(len + 1);
 #if LV_USE_ARABIC_PERSIAN_CHARS
-    _lv_txt_ap_proc(txt, cb->txt);
+    _lv_txt_ap_proc(txt, _txt);
 #else
-    strcpy(cb->txt, txt);
+    strcpy(_txt, txt);
 #endif
 
+    cb->txt = _txt;
     cb->static_txt = 0;
 
     lv_obj_refresh_self_size(obj);
@@ -92,7 +94,7 @@ void lv_checkbox_set_text_static(lv_obj_t * obj, const char * txt)
 {
     lv_checkbox_t * cb = (lv_checkbox_t *)obj;
 
-    if(!cb->static_txt) lv_mem_free(cb->txt);
+    if(!cb->static_txt) lv_mem_free((void *)cb->txt);
 
     cb->txt = (char *)txt;
     cb->static_txt = 1;
@@ -138,7 +140,7 @@ static void lv_checkbox_destructor(const lv_obj_class_t * class_p, lv_obj_t * ob
 
     lv_checkbox_t * cb = (lv_checkbox_t *)obj;
     if(!cb->static_txt) {
-        lv_mem_free(cb->txt);
+        lv_mem_free((void *)cb->txt);
         cb->txt = NULL;
     }
     LV_TRACE_OBJ_CREATE("finished");

src/widgets/lv_checkbox.h

@@ -28,7 +28,7 @@ extern "C" {
 
 typedef struct {
     lv_obj_t obj;
-    char * txt;
+    const char * txt;
     uint32_t static_txt : 1;
 } lv_checkbox_t;
 

src/widgets/lv_dropdown.c

@@ -285,6 +285,10 @@ void lv_dropdown_set_selected(lv_obj_t * obj, uint16_t sel_opt)
     dropdown->sel_opt_id      = sel_opt < dropdown->option_cnt ? sel_opt : dropdown->option_cnt - 1;
     dropdown->sel_opt_id_orig = dropdown->sel_opt_id;
 
+    if(dropdown->list) {
+        position_to_selected(obj);
+    }
+
     lv_obj_invalidate(obj);
 }
 
@@ -403,14 +407,19 @@ int32_t lv_dropdown_get_option_index(lv_obj_t * obj, const char * option)
     const char * opts = lv_dropdown_get_options(obj);
     uint32_t char_i = 0;
     uint32_t opt_i = 0;
+    uint32_t option_len = strlen(option);
     const char * start = opts;
 
     while(start[char_i] != '\0') {
         for(char_i = 0; (start[char_i] != '\n') && (start[char_i] != '\0'); char_i++);
 
-        if(memcmp(start, option, LV_MIN(strlen(option), char_i)) == 0) return opt_i;
+        if(option_len == char_i && memcmp(start, option, LV_MIN(option_len, char_i)) == 0) {
+            return opt_i;
+        }
+
         start = &start[char_i];
         if(start[0] == '\n') start++;
+        char_i = 0;
         opt_i++;
     }
 

src/widgets/lv_table.c

@@ -40,7 +40,7 @@ static void refr_size_form_row(lv_obj_t * obj, uint32_t start_row);
 static void refr_cell_size(lv_obj_t * obj, uint32_t row, uint32_t col);
 static lv_res_t get_pressed_cell(lv_obj_t * obj, uint16_t * row, uint16_t * col);
 static size_t get_cell_txt_len(const char * txt);
-static void copy_cell_txt(char * dst, const char * txt);
+static void copy_cell_txt(lv_table_cell_t * dst, const char * txt);
 static void get_cell_area(lv_obj_t * obj, uint16_t row, uint16_t col, lv_area_t * area);
 static void scroll_to_selected_cell(lv_obj_t * obj);
 
@@ -98,7 +98,14 @@ void lv_table_set_cell_value(lv_obj_t * obj, uint16_t row, uint16_t col, const c
     lv_table_cell_ctrl_t ctrl = 0;
 
     /*Save the control byte*/
-    if(table->cell_data[cell]) ctrl = table->cell_data[cell][0];
+    if(table->cell_data[cell]) ctrl = table->cell_data[cell]->ctrl;
+
+#if LV_USE_USER_DATA
+    void * user_data = NULL;
+
+    /*Save the user data*/
+    if(table->cell_data[cell]) user_data = table->cell_data[cell]->user_data;
+#endif
 
     size_t to_allocate = get_cell_txt_len(txt);
 
@@ -108,7 +115,10 @@ void lv_table_set_cell_value(lv_obj_t * obj, uint16_t row, uint16_t col, const c
 
     copy_cell_txt(table->cell_data[cell], txt);
 
-    table->cell_data[cell][0] = ctrl;
+    table->cell_data[cell]->ctrl = ctrl;
+#if LV_USE_USER_DATA
+    table->cell_data[cell]->user_data = user_data;
+#endif
     refr_cell_size(obj, row, col);
 }
 
@@ -131,7 +141,14 @@ void lv_table_set_cell_value_fmt(lv_obj_t * obj, uint16_t row, uint16_t col, con
     lv_table_cell_ctrl_t ctrl = 0;
 
     /*Save the control byte*/
-    if(table->cell_data[cell]) ctrl = table->cell_data[cell][0];
+    if(table->cell_data[cell]) ctrl = table->cell_data[cell]->ctrl;
+
+#if LV_USE_USER_DATA
+    void * user_data = NULL;
+
+    /*Save the user_data*/
+    if(table->cell_data[cell]) user_data = table->cell_data[cell]->user_data;
+#endif
 
     va_list ap, ap2;
     va_start(ap, fmt);
@@ -154,32 +171,35 @@ void lv_table_set_cell_value_fmt(lv_obj_t * obj, uint16_t row, uint16_t col, con
 
     /*Get the size of the Arabic text and process it*/
     size_t len_ap = _lv_txt_ap_calc_bytes_cnt(raw_txt);
-    table->cell_data[cell] = lv_mem_realloc(table->cell_data[cell], len_ap + 1);
+    table->cell_data[cell] = lv_mem_realloc(table->cell_data[cell], sizeof(lv_table_cell_t) + len_ap + 1);
     LV_ASSERT_MALLOC(table->cell_data[cell]);
     if(table->cell_data[cell] == NULL) {
         va_end(ap2);
         return;
     }
-    _lv_txt_ap_proc(raw_txt, &table->cell_data[cell][1]);
+    _lv_txt_ap_proc(raw_txt, table->cell_data[cell]->txt);
 
     lv_mem_buf_release(raw_txt);
 #else
-    table->cell_data[cell] = lv_mem_realloc(table->cell_data[cell], len + 2); /*+1: trailing '\0; +1: format byte*/
+    table->cell_data[cell] = lv_mem_realloc(table->cell_data[cell],
+                                            sizeof(lv_table_cell_t) + len + 1); /*+1: trailing '\0; */
     LV_ASSERT_MALLOC(table->cell_data[cell]);
     if(table->cell_data[cell] == NULL) {
         va_end(ap2);
         return;
     }
 
-    table->cell_data[cell][len + 1] = 0; /*Ensure NULL termination*/
+    table->cell_data[cell]->txt[len] = 0; /*Ensure NULL termination*/
 
-    lv_vsnprintf(&table->cell_data[cell][1], len + 1, fmt, ap2);
+    lv_vsnprintf(table->cell_data[cell]->txt, len + 1, fmt, ap2);
 #endif
 
     va_end(ap2);
 
-    table->cell_data[cell][0] = ctrl;
-
+    table->cell_data[cell]->ctrl = ctrl;
+#if LV_USE_USER_DATA
+    table->cell_data[cell]->user_data = user_data;
+#endif
     refr_cell_size(obj, row, col);
 }
 
@@ -204,11 +224,17 @@ void lv_table_set_row_cnt(lv_obj_t * obj, uint16_t row_cnt)
         uint32_t new_cell_cnt = table->col_cnt * table->row_cnt;
         uint32_t i;
         for(i = new_cell_cnt; i < old_cell_cnt; i++) {
+#if LV_USE_USER_DATA
+            if(table->cell_data[i]->user_data) {
+                lv_mem_free(table->cell_data[i]->user_data);
+                table->cell_data[i]->user_data = NULL;
+            }
+#endif
             lv_mem_free(table->cell_data[i]);
         }
     }
 
-    table->cell_data = lv_mem_realloc(table->cell_data, table->row_cnt * table->col_cnt * sizeof(char *));
+    table->cell_data = lv_mem_realloc(table->cell_data, table->row_cnt * table->col_cnt * sizeof(lv_table_cell_t *));
     LV_ASSERT_MALLOC(table->cell_data);
     if(table->cell_data == NULL) return;
 
@@ -233,7 +259,7 @@ void lv_table_set_col_cnt(lv_obj_t * obj, uint16_t col_cnt)
     uint16_t old_col_cnt = table->col_cnt;
     table->col_cnt         = col_cnt;
 
-    char ** new_cell_data = lv_mem_alloc(table->row_cnt * table->col_cnt * sizeof(char *));
+    lv_table_cell_t ** new_cell_data = lv_mem_alloc(table->row_cnt * table->col_cnt * sizeof(lv_table_cell_t *));
     LV_ASSERT_MALLOC(new_cell_data);
     if(new_cell_data == NULL) return;
     uint32_t new_cell_cnt = table->col_cnt * table->row_cnt;
@@ -256,6 +282,12 @@ void lv_table_set_col_cnt(lv_obj_t * obj, uint16_t col_cnt)
         int32_t i;
         for(i = 0; i < (int32_t)old_col_cnt - col_cnt; i++) {
             uint32_t idx = old_col_start + min_col_cnt + i;
+#if LV_USE_USER_DATA
+            if(table->cell_data[idx]->user_data) {
+                lv_mem_free(table->cell_data[idx]->user_data);
+                table->cell_data[idx]->user_data = NULL;
+            }
+#endif
             lv_mem_free(table->cell_data[idx]);
             table->cell_data[idx] = NULL;
         }
@@ -304,15 +336,18 @@ void lv_table_add_cell_ctrl(lv_obj_t * obj, uint16_t row, uint16_t col, lv_table
     uint32_t cell = row * table->col_cnt + col;
 
     if(is_cell_empty(table->cell_data[cell])) {
-        table->cell_data[cell]    = lv_mem_alloc(2); /*+1: trailing '\0; +1: format byte*/
+        table->cell_data[cell]    = lv_mem_alloc(sizeof(lv_table_cell_t) + 1); /*+1: trailing '\0 */
         LV_ASSERT_MALLOC(table->cell_data[cell]);
         if(table->cell_data[cell] == NULL) return;
 
-        table->cell_data[cell][0] = 0;
-        table->cell_data[cell][1] = '\0';
+        table->cell_data[cell]->ctrl = 0;
+#if LV_USE_USER_DATA
+        table->cell_data[cell]->user_data = NULL;
+#endif
+        table->cell_data[cell]->txt[0] = '\0';
     }
 
-    table->cell_data[cell][0] |= ctrl;
+    table->cell_data[cell]->ctrl |= ctrl;
 }
 
 void lv_table_clear_cell_ctrl(lv_obj_t * obj, uint16_t row, uint16_t col, lv_table_cell_ctrl_t ctrl)
@@ -328,17 +363,51 @@ void lv_table_clear_cell_ctrl(lv_obj_t * obj, uint16_t row, uint16_t col, lv_tab
     uint32_t cell = row * table->col_cnt + col;
 
     if(is_cell_empty(table->cell_data[cell])) {
-        table->cell_data[cell]    = lv_mem_alloc(2); /*+1: trailing '\0; +1: format byte*/
+        table->cell_data[cell]    = lv_mem_alloc(sizeof(lv_table_cell_t) + 1); /*+1: trailing '\0 */
         LV_ASSERT_MALLOC(table->cell_data[cell]);
         if(table->cell_data[cell] == NULL) return;
 
-        table->cell_data[cell][0] = 0;
-        table->cell_data[cell][1] = '\0';
+        table->cell_data[cell]->ctrl = 0;
+#if LV_USE_USER_DATA
+        table->cell_data[cell]->user_data = NULL;
+#endif
+        table->cell_data[cell]->txt[0] = '\0';
     }
 
-    table->cell_data[cell][0] &= (~ctrl);
+    table->cell_data[cell]->ctrl &= (~ctrl);
 }
 
+#if LV_USE_USER_DATA
+void lv_table_set_cell_user_data(lv_obj_t * obj, uint16_t row, uint16_t col, void * user_data)
+{
+    LV_ASSERT_OBJ(obj, MY_CLASS);
+
+    lv_table_t * table = (lv_table_t *)obj;
+
+    /*Auto expand*/
+    if(col >= table->col_cnt) lv_table_set_col_cnt(obj, col + 1);
+    if(row >= table->row_cnt) lv_table_set_row_cnt(obj, row + 1);
+
+    uint32_t cell = row * table->col_cnt + col;
+
+    if(is_cell_empty(table->cell_data[cell])) {
+        table->cell_data[cell]    = lv_mem_alloc(sizeof(lv_table_cell_t) + 1); /*+1: trailing '\0 */
+        LV_ASSERT_MALLOC(table->cell_data[cell]);
+        if(table->cell_data[cell] == NULL) return;
+
+        table->cell_data[cell]->ctrl = 0;
+        table->cell_data[cell]->user_data = NULL;
+        table->cell_data[cell]->txt[0] = '\0';
+    }
+
+    if(table->cell_data[cell]->user_data) {
+        lv_mem_free(table->cell_data[cell]->user_data);
+    }
+
+    table->cell_data[cell]->user_data = user_data;
+}
+#endif
+
 /*=====================
  * Getter functions
  *====================*/
@@ -356,7 +425,7 @@ const char * lv_table_get_cell_value(lv_obj_t * obj, uint16_t row, uint16_t col)
 
     if(is_cell_empty(table->cell_data[cell])) return "";
 
-    return &table->cell_data[cell][1]; /*Skip the format byte*/
+    return table->cell_data[cell]->txt;
 }
 
 uint16_t lv_table_get_row_cnt(lv_obj_t * obj)
@@ -401,7 +470,7 @@ bool lv_table_has_cell_ctrl(lv_obj_t * obj, uint16_t row, uint16_t col, lv_table
     uint32_t cell = row * table->col_cnt + col;
 
     if(is_cell_empty(table->cell_data[cell])) return false;
-    else return (table->cell_data[cell][0] & ctrl) == ctrl;
+    else return (table->cell_data[cell]->ctrl & ctrl) == ctrl;
 }
 
 void lv_table_get_selected_cell(lv_obj_t * obj, uint16_t * row, uint16_t * col)
@@ -411,6 +480,24 @@ void lv_table_get_selected_cell(lv_obj_t * obj, uint16_t * row, uint16_t * col)
     *col = table->col_act;
 }
 
+#if LV_USE_USER_DATA
+void * lv_table_get_cell_user_data(lv_obj_t * obj, uint16_t row, uint16_t col)
+{
+    LV_ASSERT_OBJ(obj, MY_CLASS);
+
+    lv_table_t * table = (lv_table_t *)obj;
+    if(row >= table->row_cnt || col >= table->col_cnt) {
+        LV_LOG_WARN("invalid row or column");
+        return NULL;
+    }
+    uint32_t cell = row * table->col_cnt + col;
+
+    if(is_cell_empty(table->cell_data[cell])) return NULL;
+
+    return table->cell_data[cell]->user_data;
+}
+#endif
+
 /**********************
  *   STATIC FUNCTIONS
  **********************/
@@ -428,7 +515,7 @@ static void lv_table_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
     table->row_h = lv_mem_alloc(table->row_cnt * sizeof(table->row_h[0]));
     table->col_w[0] = LV_DPI_DEF;
     table->row_h[0] = LV_DPI_DEF;
-    table->cell_data = lv_mem_realloc(table->cell_data, table->row_cnt * table->col_cnt * sizeof(char *));
+    table->cell_data = lv_mem_realloc(table->cell_data, table->row_cnt * table->col_cnt * sizeof(lv_table_cell_t *));
     table->cell_data[0] = NULL;
 
     LV_TRACE_OBJ_CREATE("finished");
@@ -442,6 +529,12 @@ static void lv_table_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
     uint16_t i;
     for(i = 0; i < table->col_cnt * table->row_cnt; i++) {
         if(table->cell_data[i]) {
+#if LV_USE_USER_DATA
+            if(table->cell_data[i]->user_data) {
+                lv_mem_free(table->cell_data[i]->user_data);
+                table->cell_data[i]->user_data = NULL;
+            }
+#endif
             lv_mem_free(table->cell_data[i]);
             table->cell_data[i] = NULL;
         }
@@ -639,7 +732,7 @@ static void draw_main(lv_event_t * e)
 
         for(col = 0; col < table->col_cnt; col++) {
             lv_table_cell_ctrl_t ctrl = 0;
-            if(table->cell_data[cell]) ctrl = table->cell_data[cell][0];
+            if(table->cell_data[cell]) ctrl = table->cell_data[cell]->ctrl;
 
             if(rtl) {
                 cell_area.x2 = cell_area.x1 - 1;
@@ -652,11 +745,11 @@ static void draw_main(lv_event_t * e)
 
             uint16_t col_merge = 0;
             for(col_merge = 0; col_merge + col < table->col_cnt - 1; col_merge++) {
-                char * next_cell_data = table->cell_data[cell + col_merge];
+                lv_table_cell_t * next_cell_data = table->cell_data[cell + col_merge];
 
                 if(is_cell_empty(next_cell_data)) break;
 
-                lv_table_cell_ctrl_t merge_ctrl = (lv_table_cell_ctrl_t) next_cell_data[0];
+                lv_table_cell_ctrl_t merge_ctrl = (lv_table_cell_ctrl_t) next_cell_data->ctrl;
                 if(merge_ctrl & LV_TABLE_CELL_CTRL_MERGE_RIGHT) {
                     lv_coord_t offset = table->col_w[col + col_merge + 1];
 
@@ -739,7 +832,7 @@ static void draw_main(lv_event_t * e)
                 bool crop = ctrl & LV_TABLE_CELL_CTRL_TEXT_CROP ? true : false;
                 if(crop) txt_flags = LV_TEXT_FLAG_EXPAND;
 
-                lv_txt_get_size(&txt_size, table->cell_data[cell] + 1, label_dsc_def.font,
+                lv_txt_get_size(&txt_size, table->cell_data[cell]->txt, label_dsc_def.font,
                                 label_dsc_act.letter_space, label_dsc_act.line_space,
                                 lv_area_get_width(&txt_area), txt_flags);
 
@@ -754,7 +847,7 @@ static void draw_main(lv_event_t * e)
                 label_mask_ok = _lv_area_intersect(&label_clip_area, &clip_area, &cell_area);
                 if(label_mask_ok) {
                     draw_ctx->clip_area = &label_clip_area;
-                    lv_draw_label(draw_ctx, &label_dsc_act, &txt_area, table->cell_data[cell] + 1, NULL);
+                    lv_draw_label(draw_ctx, &label_dsc_act, &txt_area, table->cell_data[cell]->txt, NULL);
                     draw_ctx->clip_area = &clip_area;
                 }
             }
@@ -845,7 +938,7 @@ static lv_coord_t get_row_height(lv_obj_t * obj, uint16_t row_id, const lv_font_
     uint16_t cell;
     uint16_t col;
     for(cell = row_start, col = 0; cell < row_start + table->col_cnt; cell++, col++) {
-        char * cell_data = table->cell_data[cell];
+        lv_table_cell_t * cell_data = table->cell_data[cell];
 
         if(is_cell_empty(cell_data)) {
             continue;
@@ -858,11 +951,11 @@ static lv_coord_t get_row_height(lv_obj_t * obj, uint16_t row_id, const lv_font_
          * exit the traversal when the current cell control is not LV_TABLE_CELL_CTRL_MERGE_RIGHT */
         uint16_t col_merge = 0;
         for(col_merge = 0; col_merge + col < table->col_cnt - 1; col_merge++) {
-            char * next_cell_data = table->cell_data[cell + col_merge];
+            lv_table_cell_t * next_cell_data = table->cell_data[cell + col_merge];
 
             if(is_cell_empty(next_cell_data)) break;
 
-            lv_table_cell_ctrl_t ctrl = (lv_table_cell_ctrl_t) next_cell_data[0];
+            lv_table_cell_ctrl_t ctrl = (lv_table_cell_ctrl_t) next_cell_data->ctrl;
             if(ctrl & LV_TABLE_CELL_CTRL_MERGE_RIGHT) {
                 txt_w += table->col_w[col + col_merge + 1];
             }
@@ -871,7 +964,7 @@ static lv_coord_t get_row_height(lv_obj_t * obj, uint16_t row_id, const lv_font_
             }
         }
 
-        lv_table_cell_ctrl_t ctrl = (lv_table_cell_ctrl_t) cell_data[0];
+        lv_table_cell_ctrl_t ctrl = (lv_table_cell_ctrl_t) cell_data->ctrl;
 
         /*When cropping the text we can assume the row height is equal to the line height*/
         if(ctrl & LV_TABLE_CELL_CTRL_TEXT_CROP) {
@@ -883,7 +976,7 @@ static lv_coord_t get_row_height(lv_obj_t * obj, uint16_t row_id, const lv_font_
             lv_point_t txt_size;
             txt_w -= cell_left + cell_right;
 
-            lv_txt_get_size(&txt_size, table->cell_data[cell] + 1, font,
+            lv_txt_get_size(&txt_size, table->cell_data[cell]->txt, font,
                             letter_space, line_space, txt_w, LV_TEXT_FLAG_NONE);
 
             h_max = LV_MAX(txt_size.y + cell_top + cell_bottom, h_max);
@@ -953,23 +1046,21 @@ static size_t get_cell_txt_len(const char * txt)
     size_t retval = 0;
 
 #if LV_USE_ARABIC_PERSIAN_CHARS
-    retval = _lv_txt_ap_calc_bytes_cnt(txt) + 1;
+    retval = sizeof(lv_table_cell_t) + _lv_txt_ap_calc_bytes_cnt(txt) + 1;
 #else
-    /* cell_data layout: [ctrl][txt][trailing '\0' terminator]
-     * +2 because of the trailing '\0' and the ctrl */
-    retval = strlen(txt) + 2;
+    retval = sizeof(lv_table_cell_t) + strlen(txt) + 1;
 #endif
 
     return retval;
 }
 
 /* Copy txt into dst skipping the format byte */
-static void copy_cell_txt(char * dst, const char * txt)
+static void copy_cell_txt(lv_table_cell_t * dst, const char * txt)
 {
 #if LV_USE_ARABIC_PERSIAN_CHARS
-    _lv_txt_ap_proc(txt, &dst[1]);
+    _lv_txt_ap_proc(txt, dst->txt);
 #else
-    strcpy(&dst[1], txt);
+    strcpy(dst->txt, txt);
 #endif
 }
 

src/widgets/lv_table.h

@@ -46,12 +46,21 @@ enum {
 
 typedef uint8_t  lv_table_cell_ctrl_t;
 
+/*Data of cell*/
+typedef struct {
+    lv_table_cell_ctrl_t ctrl;
+#if LV_USE_USER_DATA
+    void * user_data; /**< Custom user data*/
+#endif
+    char txt[];
+} lv_table_cell_t;
+
 /*Data of table*/
 typedef struct {
     lv_obj_t obj;
     uint16_t col_cnt;
     uint16_t row_cnt;
-    char ** cell_data;
+    lv_table_cell_t ** cell_data;
     lv_coord_t * row_h;
     lv_coord_t * col_w;
     uint16_t col_act;
@@ -144,6 +153,17 @@ void lv_table_add_cell_ctrl(lv_obj_t * obj, uint16_t row, uint16_t col, lv_table
  */
 void lv_table_clear_cell_ctrl(lv_obj_t * obj, uint16_t row, uint16_t col, lv_table_cell_ctrl_t ctrl);
 
+#if LV_USE_USER_DATA
+/**
+ * Add custom user data to the cell.
+ * @param obj       pointer to a Table object
+ * @param row       id of the row [0 .. row_cnt -1]
+ * @param col       id of the column [0 .. col_cnt -1]
+ * @param user_data pointer to the new user_data. It must be allocated by user as it will be freed automatically
+ */
+void lv_table_set_cell_user_data(lv_obj_t * obj, uint16_t row, uint16_t col, void * user_data);
+#endif
+
 /*=====================
  * Getter functions
  *====================*/
@@ -197,6 +217,16 @@ bool lv_table_has_cell_ctrl(lv_obj_t * obj, uint16_t row, uint16_t col, lv_table
  */
 void lv_table_get_selected_cell(lv_obj_t * obj, uint16_t * row, uint16_t * col);
 
+#if LV_USE_USER_DATA
+/**
+ * Get custom user data to the cell.
+ * @param obj       pointer to a Table object
+ * @param row       id of the row [0 .. row_cnt -1]
+ * @param col       id of the column [0 .. col_cnt -1]
+ */
+void * lv_table_get_cell_user_data(lv_obj_t * obj, uint16_t row, uint16_t col);
+#endif
+
 /**********************
  *      MACROS
  **********************/

tests/CMakeLists.txt

@@ -334,6 +334,7 @@ add_library(test_common
         src/test_fonts/font_1.c
         src/test_fonts/font_2.c
         src/test_fonts/font_3.c
+        src/test_fonts/ubuntu_font.c
         unity/unity_support.c
         unity/unity.c
 )
@@ -363,7 +364,7 @@ foreach( test_case_fname ${TEST_CASE_FILES} )
         ${test_case_fname}
         ${test_runner_fname}
     )
-    target_link_libraries(${test_name} test_common lvgl_examples lvgl_demos lvgl png ${TEST_LIBS})
+    target_link_libraries(${test_name} test_common lvgl_examples lvgl_demos lvgl png m ${TEST_LIBS})
     target_include_directories(${test_name} PUBLIC ${TEST_INCLUDE_DIRS})
     target_compile_options(${test_name} PUBLIC ${LVGL_TESTFILE_COMPILE_OPTIONS})
 

tests/src/lv_test_conf.h

@@ -20,6 +20,8 @@ extern "C" {
  *      DEFINES
  *********************/
 
+#define LV_USE_TINY_TTF 1
+
 void lv_test_assert_fail(void);
 #define LV_ASSERT_HANDLER lv_test_assert_fail();
 

tests/src/test_cases/test_arc.c

@@ -158,6 +158,53 @@ void test_arc_click_area_with_adv_hittest(void)
     TEST_ASSERT_EQUAL_UINT32(0, event_cnt);
 }
 
+/* Check value doesn't go to max when clicking on the other side of the arc */
+void test_arc_click_sustained_from_start_to_end_does_not_set_value_to_max(void)
+{
+    arc = lv_arc_create(lv_scr_act());
+    lv_arc_set_value(arc, 0);
+
+    lv_obj_set_size(arc, 100, 100);
+    lv_obj_center(arc);
+    lv_obj_add_event_cb(arc, dummy_event_cb, LV_EVENT_PRESSED, NULL);
+    event_cnt = 0;
+
+    /* Click close to start angle */
+    event_cnt = 0;
+    lv_test_mouse_move_to(376, 285);
+    lv_test_mouse_press();
+    lv_test_indev_wait(50);
+    lv_test_mouse_release();
+    lv_test_indev_wait(50);
+
+    TEST_ASSERT_EQUAL_UINT32(1, event_cnt);
+    TEST_ASSERT_EQUAL_UINT32(lv_arc_get_value(arc), lv_arc_get_min_value(arc));
+
+    /* Click close to end angle */
+    event_cnt = 0;
+
+    lv_test_mouse_move_to(376, 285);
+    lv_test_mouse_press();
+    lv_test_indev_wait(50);
+    lv_test_mouse_move_to(415, 281);
+    lv_test_indev_wait(50);
+    lv_test_mouse_release();
+    lv_test_indev_wait(50);
+
+    TEST_ASSERT_EQUAL_UINT32(1, event_cnt);
+    TEST_ASSERT_NOT_EQUAL_UINT32(lv_arc_get_value(arc), lv_arc_get_max_value(arc));
+
+    TEST_ASSERT_EQUAL_SCREENSHOT("arc_2.png");
+}
+
+void test_arc_basic_render(void)
+{
+    arc = lv_arc_create(lv_scr_act());
+    lv_obj_set_size(arc, 100, 100);
+    lv_obj_center(arc);
+    TEST_ASSERT_EQUAL_SCREENSHOT("arc_1.png");
+}
+
 static void dummy_event_cb(lv_event_t * e)
 {
     LV_UNUSED(e);

tests/src/test_cases/test_dropdown.c

@@ -355,10 +355,10 @@ void test_dropdown_render_1(void)
 
     lv_dropdown_set_options(dd3, "a0\na1\na2\na3\na4\na5\na6\na7\na8\na9\na10\na11\na12\na13\na14\na15\na16");
     lv_dropdown_open(dd3);
-    lv_dropdown_set_selected(dd3, 3);
     lv_obj_t * list = lv_dropdown_get_list(dd3);
     lv_obj_set_style_text_line_space(list, 5, 0);
     lv_obj_set_style_bg_color(list, lv_color_hex3(0xf00), LV_PART_SELECTED | LV_STATE_CHECKED);
+    lv_dropdown_set_selected(dd3, 3);
 
 
     TEST_ASSERT_EQUAL_SCREENSHOT("dropdown_1.png");

tests/src/test_cases/test_tiny_ttf.c

@@ -0,0 +1,49 @@
+#if LV_BUILD_TEST
+#include "../lvgl.h"
+
+#include "unity/unity.h"
+
+void setUp(void)
+{
+    /* Function run before every test */
+}
+
+void tearDown(void)
+{
+    /* Function run after every test */
+}
+
+void test_tiny_ttf_rendering_test(void)
+{
+#if LV_USE_TINY_TTF
+    /*Create a font*/
+    extern const uint8_t ubuntu_font[];
+    extern size_t ubuntu_font_size;
+    lv_font_t * font = lv_tiny_ttf_create_data(ubuntu_font, ubuntu_font_size, 30);
+
+    /*Create style with the new font*/
+    static lv_style_t style;
+    lv_style_init(&style);
+    lv_style_set_text_font(&style, font);
+    lv_style_set_text_align(&style, LV_TEXT_ALIGN_CENTER);
+    lv_style_set_bg_opa(&style, LV_OPA_COVER);
+    lv_style_set_bg_color(&style, lv_color_hex(0xffaaaa));
+
+    /*Create a label with the new style*/
+    lv_obj_t * label = lv_label_create(lv_scr_act());
+    lv_obj_add_style(label, &style, 0);
+    lv_label_set_text(label, "Hello world\n"
+                      "I'm a font created with Tiny TTF\n"
+                      "Accents: ÁÉÍÓÖŐÜŰ áéíóöőüű");
+    lv_obj_center(label);
+
+    TEST_ASSERT_EQUAL_SCREENSHOT("tiny_ttf_1.png");
+
+    lv_obj_del(label);
+    lv_tiny_ttf_destroy(font);
+#else
+    TEST_PASS();
+#endif
+}
+
+#endif

tests/unity/unity_support.c

@@ -28,6 +28,8 @@
  *********************/
 //#define REF_IMGS_PATH "lvgl/tests/lv_test_ref_imgs/"
 #define REF_IMGS_PATH "ref_imgs/"
+#define ERR_FILE_NOT_FOUND  -1
+#define ERR_PNG             -2
 
 /**********************
  *      TYPEDEFS
@@ -41,12 +43,13 @@ typedef struct {
     png_infop info_ptr;
     int number_of_passes;
     png_bytep * row_pointers;
-}png_img_t;
+} png_img_t;
 
 /**********************
  *  STATIC PROTOTYPES
  **********************/
-static int read_png_file(png_img_t * p, const char* file_name);
+static int read_png_file(png_img_t * p, const char * file_name);
+static int write_png_file(void * raw_img, uint32_t width, uint32_t height, char * file_name);
 static void png_release(png_img_t * p);
 
 /**********************
@@ -63,95 +66,74 @@ static void png_release(png_img_t * p);
 
 bool lv_test_assert_img_eq(const char * fn_ref)
 {
-  char fn_ref_full[512];
-  sprintf(fn_ref_full, "%s%s", REF_IMGS_PATH, fn_ref);
+    char fn_ref_full[512];
+    sprintf(fn_ref_full, "%s%s", REF_IMGS_PATH, fn_ref);
 
-  png_img_t p;
-  int res = read_png_file(&p, fn_ref_full);
-  if(res < 0) return false;
-  uint8_t * screen_buf;
+    uint8_t * screen_buf;
 
-  lv_obj_invalidate(lv_scr_act());
-  lv_refr_now(NULL);
+    lv_obj_invalidate(lv_scr_act());
+    lv_refr_now(NULL);
 
-  extern lv_color_t test_fb[];
+    extern lv_color32_t test_fb[];
 
-  screen_buf = (uint8_t *)test_fb;
+    screen_buf = (uint8_t *)test_fb;
 
-  uint8_t * ptr_act = NULL;
-  const png_byte* ptr_ref = NULL;
+    png_img_t p;
+    int res = read_png_file(&p, fn_ref_full);
+    if(res == ERR_FILE_NOT_FOUND) {
+        TEST_PRINTF("%s%s", fn_ref_full, " was not found, creating is now from the rendered screen");
+        fflush(stderr);
+        write_png_file(screen_buf, 800, 480, fn_ref_full);
 
-  bool err = false;
-  int x, y, i_buf = 0;
-  for (y = 0; y < p.height; y++) {
-    png_byte* row = p.row_pointers[y];
-
-    for (x = 0; x < p.width; x++) {
-      ptr_ref = &(row[x*3]);
-      ptr_act = &(screen_buf[i_buf*4]);
-
-      uint32_t ref_px = 0;
-      uint32_t act_px = 0;
-      memcpy(&ref_px, ptr_ref, 3);
-      memcpy(&act_px, ptr_act, 3);
-      //printf("0xFF%06x, ", act_px);
-
-      uint8_t act_swap[3] = {ptr_act[2], ptr_act[1], ptr_act[0]};
-
-      if(memcmp(act_swap, ptr_ref, 3) != 0) {
-        err = true;
-        break;
-      }
-      i_buf++;
+        return true;
+    }
+    else if(res == ERR_PNG) {
+        return false;
     }
-    if(err) break;
-  }
 
-  if(err) {
-      uint32_t ref_px = 0;
-      uint32_t act_px = 0;
-      memcpy(&ref_px, ptr_ref, 3);
-      memcpy(&act_px, ptr_act, 3);
+    uint8_t * ptr_act = NULL;
+    const png_byte * ptr_ref = NULL;
 
-      FILE * f = fopen("../test_screenshot_error.h", "w");
+    bool err = false;
+    int x, y, i_buf = 0;
+    for(y = 0; y < p.height; y++) {
+        png_byte * row = p.row_pointers[y];
 
-      fprintf(f, "//Diff in %s at (%d;%d), %x instead of %x)\n\n", fn_ref, x, y, act_px, ref_px);
-      fprintf(f, "static const uint32_t test_screenshot_error_data[] = {\n");
+        for(x = 0; x < p.width; x++) {
+            ptr_ref = &(row[x * 3]);
+            ptr_act = &(screen_buf[i_buf * 4]);
 
-      i_buf = 0;
-      for (y = 0; y < 480; y++) {
-        fprintf(f, "\n");
-        for (x = 0; x < 800; x++) {
-          ptr_act = &(screen_buf[i_buf * 4]);
-          act_px = 0;
-          memcpy(&act_px, ptr_act, 3);
-          fprintf(f, "0xFF%06X, ", act_px);
-          i_buf++;
+            uint32_t ref_px = 0;
+            uint32_t act_px = 0;
+            memcpy(&ref_px, ptr_ref, 3);
+            memcpy(&act_px, ptr_act, 3);
+            //printf("0xFF%06x, ", act_px);
+
+            uint8_t act_swap[3] = {ptr_act[2], ptr_act[1], ptr_act[0]};
+
+            if(memcmp(act_swap, ptr_ref, 3) != 0) {
+                err = true;
+                break;
+            }
+            i_buf++;
         }
-      }
-      fprintf(f, "};\n\n");
+        if(err) break;
+    }
 
-      fprintf(f, "static lv_img_dsc_t test_screenshot_error_dsc = { \n"
-      "  .header.w = 800,\n"
-      "  .header.h = 480,\n"
-      "  .header.always_zero = 0,\n"
-      "  .header.cf = LV_IMG_CF_TRUE_COLOR,\n"
-      "  .data_size = 800 * 480 * 4,\n"
-      "  .data = test_screenshot_error_data};\n\n"
-      "static inline void test_screenshot_error_show(void)\n"
-      "{\n"
-      "  lv_obj_t * img = lv_img_create(lv_scr_act());\n"
-      "  lv_img_set_src(img, &test_screenshot_error_dsc);\n"
-      "}\n");
+    if(err) {
+        char fn_ref_no_ext[64];
+        strcpy(fn_ref_no_ext, fn_ref);
+        fn_ref_no_ext[strlen(fn_ref_no_ext) - 4] = '\0';
 
-      fclose(f);
+        char fn_err_full[512];
+        sprintf(fn_err_full, "%s%s_err.png", REF_IMGS_PATH, fn_ref_no_ext);
 
-  }
+        write_png_file(screen_buf, 800, 480, fn_err_full);
+    }
 
+    png_release(&p);
 
-  png_release(&p);
-
-  return !err;
+    return !err;
 
 }
 
@@ -159,39 +141,39 @@ bool lv_test_assert_img_eq(const char * fn_ref)
  *   STATIC FUNCTIONS
  **********************/
 
-static int read_png_file(png_img_t * p, const char* file_name)
+static int read_png_file(png_img_t * p, const char * file_name)
 {
     char header[8];    // 8 is the maximum size that can be checked
 
     /*open file and test for it being a png*/
-    FILE *fp = fopen(file_name, "rb");
-    if (!fp) {
-       TEST_PRINTF("%s", "PNG file %s could not be opened for reading");
-        return -1;
+    FILE * fp = fopen(file_name, "rb");
+    if(!fp) {
+        TEST_PRINTF("[read_png_file %s] could not be opened for reading", file_name);
+        return ERR_FILE_NOT_FOUND;
     }
 
     size_t rcnt = fread(header, 1, 8, fp);
-    if (rcnt != 8 || png_sig_cmp((png_const_bytep)header, 0, 8)) {
-        TEST_PRINTF("%s is not recognized as a PNG file", file_name);
-        return -1;
+    if(rcnt != 8 || png_sig_cmp((png_const_bytep)header, 0, 8)) {
+        TEST_PRINTF("[read_png_file %s]  not recognized as a PNG file", file_name);
+        return ERR_PNG;
     }
 
     /*initialize stuff*/
     p->png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
 
-    if (!p->png_ptr) {
-        TEST_PRINTF("%s", "png_create_read_struct failed");
-        return -1;
+    if(!p->png_ptr) {
+        TEST_PRINTF("[read_png_file %s] png_create_read_struct failed", file_name);
+        return ERR_PNG;
     }
 
     p->info_ptr = png_create_info_struct(p->png_ptr);
-    if (!p->info_ptr) {
-        TEST_PRINTF("%s", "png_create_info_struct failed");
-        return -1;
+    if(!p->info_ptr) {
+        TEST_PRINTF("[read_png_file %s] png_create_info_struct failed", file_name);
+        return ERR_PNG;
     }
-    if (setjmp(png_jmpbuf(p->png_ptr))) {
-        TEST_PRINTF("%s", "Error during init_io");
-        return -1;
+    if(setjmp(png_jmpbuf(p->png_ptr))) {
+        TEST_PRINTF("[read_png_file %s] Error during init_io", file_name);
+        return ERR_PNG;
     }
     png_init_io(p->png_ptr, fp);
     png_set_sig_bytes(p->png_ptr, 8);
@@ -207,15 +189,15 @@ static int read_png_file(png_img_t * p, const char* file_name)
     png_read_update_info(p->png_ptr, p->info_ptr);
 
     /*read file*/
-    if (setjmp(png_jmpbuf(p->png_ptr))) {
-        TEST_PRINTF("%s", "Error during read_image");
-        return -1;
+    if(setjmp(png_jmpbuf(p->png_ptr))) {
+        TEST_PRINTF("[read_png_file %s] Error during read_image", file_name);
+        return ERR_PNG;
     }
-    p->row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * p->height);
+    p->row_pointers = (png_bytep *) malloc(sizeof(png_bytep) * p->height);
 
     int y;
-    for (y=0; y<p->height; y++)
-        p->row_pointers[y] = (png_byte*) malloc(png_get_rowbytes(p->png_ptr,p->info_ptr));
+    for(y = 0; y < p->height; y++)
+        p->row_pointers[y] = (png_byte *) malloc(png_get_rowbytes(p->png_ptr, p->info_ptr));
 
     png_read_image(p->png_ptr, p->row_pointers);
 
@@ -223,10 +205,98 @@ static int read_png_file(png_img_t * p, const char* file_name)
     return 0;
 }
 
+
+static int write_png_file(void * raw_img, uint32_t width, uint32_t height, char * file_name)
+{
+    png_structp png_ptr;
+    png_infop info_ptr;
+
+    /* create file */
+    FILE * fp = fopen(file_name, "wb");
+    if(!fp) {
+        printf("###### %s\n", file_name);
+        fflush(stdout);
+        TEST_PRINTF("[write_png_file %s] could not be opened for writing", file_name);
+        TEST_PRINTF("%s", file_name);
+        return -1;
+    }
+
+    /* initialize stuff */
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+
+    if(!png_ptr) {
+        TEST_PRINTF("[write_png_file %s] png_create_write_struct failed", file_name);
+        return -1;
+    }
+
+    info_ptr = png_create_info_struct(png_ptr);
+    if(!info_ptr) {
+        TEST_PRINTF("[write_png_file %s] png_create_info_struct failed", file_name);
+        return -1;
+    }
+
+    if(setjmp(png_jmpbuf(png_ptr))) {
+        TEST_PRINTF("[write_png_file %s] Error during init_io", file_name);
+        return -1;
+    }
+
+    png_init_io(png_ptr, fp);
+
+    /* write header */
+    if(setjmp(png_jmpbuf(png_ptr))) {
+        TEST_PRINTF("[write_png_file %s] Error during writing header", file_name);
+        return -1;
+    }
+
+    png_set_IHDR(png_ptr, info_ptr, width, height,
+                 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
+                 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+
+    png_write_info(png_ptr, info_ptr);
+
+
+    /* write bytes */
+    if(setjmp(png_jmpbuf(png_ptr))) {
+        TEST_PRINTF("[write_png_file %s] Error during writing bytes", file_name);
+        return -1;
+    }
+
+    uint8_t * raw_img8 = (uint8_t *)raw_img;
+    png_bytep * row_pointers = (png_bytep *) malloc(sizeof(png_bytep) * height);
+    for(uint32_t y = 0; y < height; y++) {
+        row_pointers[y] = malloc(3 * width);
+        uint8_t * line = raw_img8 + y * width * 4;
+        for(uint32_t x = 0; x < width; x++) {
+            row_pointers[y][x * 3 + 0] = line[x * 4 + 2];
+            row_pointers[y][x * 3 + 1] = line[x * 4 + 1];
+            row_pointers[y][x * 3 + 2] = line[x * 4 + 0];
+        }
+    }
+    png_write_image(png_ptr, row_pointers);
+
+
+    /* end write */
+    if(setjmp(png_jmpbuf(png_ptr))) {
+        TEST_PRINTF("[write_png_file %s] Error during end of write", file_name);
+        return -1;
+    }
+    png_write_end(png_ptr, NULL);
+
+    /* cleanup heap allocation */
+    for(uint32_t y = 0; y < height; y++) free(row_pointers[y]);
+    free(row_pointers);
+
+    png_destroy_write_struct(&png_ptr, &info_ptr);
+
+    fclose(fp);
+    return 0;
+}
+
+
 static void png_release(png_img_t * p)
 {
     int y;
-    for (y=0; y<p->height; y++) free(p->row_pointers[y]);
+    for(y = 0; y < p->height; y++) free(p->row_pointers[y]);
 
     free(p->row_pointers);