diff --git a/src/lv_core/lv_refr.c b/src/lv_core/lv_refr.c
index 2eb432133..a7c30188f 100644
--- a/src/lv_core/lv_refr.c
+++ b/src/lv_core/lv_refr.c
@@ -413,11 +413,11 @@ static void lv_refr_area_part(const lv_area_t * area_p)
  */
 static lv_obj_t * lv_refr_get_top_obj(const lv_area_t * area_p, lv_obj_t * obj)
 {
-    lv_obj_t * i;
     lv_obj_t * found_p = NULL;
 
     /*If this object is fully cover the draw area check the children too */
     if(lv_area_is_in(area_p, &obj->coords) && obj->hidden == 0) {
+        lv_obj_t * i;
         LV_LL_READ(obj->child_ll, i)
         {
             found_p = lv_refr_get_top_obj(area_p, i);
@@ -458,7 +458,6 @@ static void lv_refr_obj_and_children(lv_obj_t * top_p, const lv_area_t * mask_p)
 
     /*Draw the 'younger' sibling objects because they can be on top_obj */
     lv_obj_t * par;
-    lv_obj_t * i;
     lv_obj_t * border_p = top_p;
 
     par = lv_obj_get_parent(top_p);
@@ -466,7 +465,7 @@ static void lv_refr_obj_and_children(lv_obj_t * top_p, const lv_area_t * mask_p)
     /*Do until not reach the screen*/
     while(par != NULL) {
         /*object before border_p has to be redrawn*/
-        i = lv_ll_get_prev(&(par->child_ll), border_p);
+        lv_obj_t * i = lv_ll_get_prev(&(par->child_ll), border_p);
 
         while(i != NULL) {
             /*Refresh the objects*/
diff --git a/src/lv_objx/lv_canvas.c b/src/lv_objx/lv_canvas.c
index 854903f22..19f0750ca 100644
--- a/src/lv_objx/lv_canvas.c
+++ b/src/lv_objx/lv_canvas.c
@@ -146,7 +146,7 @@ void lv_canvas_set_px(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t
 void lv_canvas_set_style(lv_obj_t * canvas, lv_canvas_style_t type, const lv_style_t * style)
 {
     switch(type) {
-        case LV_CANVAS_STYLE_MAIN: lv_img_set_style(canvas, style); break;
+        case LV_CANVAS_STYLE_MAIN: lv_img_set_style(canvas, LV_IMG_STYLE_MAIN, style); break;
     }
 }
 
@@ -193,7 +193,7 @@ const lv_style_t * lv_canvas_get_style(const lv_obj_t * canvas, lv_canvas_style_
     const lv_style_t * style = NULL;
 
     switch(type) {
-        case LV_CANVAS_STYLE_MAIN: style = lv_img_get_style(canvas); break;
+        case LV_CANVAS_STYLE_MAIN: style = lv_img_get_style(canvas, LV_IMG_STYLE_MAIN); break;
         default: style = NULL;
     }
 
diff --git a/src/lv_objx/lv_cb.c b/src/lv_objx/lv_cb.c
index a817caa17..a12518c16 100644
--- a/src/lv_objx/lv_cb.c
+++ b/src/lv_objx/lv_cb.c
@@ -304,7 +304,7 @@ static lv_res_t lv_cb_signal(lv_obj_t * cb, lv_signal_t sign, void * param)
     lv_cb_ext_t * ext = lv_obj_get_ext_attr(cb);
 
     if(sign == LV_SIGNAL_STYLE_CHG) {
-        const lv_style_t * label_style = lv_label_get_style(ext->label);
+        const lv_style_t * label_style = lv_label_get_style(ext->label, LV_LABEL_STYLE_MAIN);
         lv_obj_set_size(ext->bullet, lv_font_get_line_height(label_style->text.font),
                         lv_font_get_line_height(label_style->text.font));
         lv_btn_set_state(ext->bullet, lv_btn_get_state(cb));
diff --git a/src/lv_objx/lv_chart.c b/src/lv_objx/lv_chart.c
index ebc0f5f3f..80d72da5b 100644
--- a/src/lv_objx/lv_chart.c
+++ b/src/lv_objx/lv_chart.c
@@ -112,9 +112,9 @@ lv_obj_t * lv_chart_create(lv_obj_t * par, const lv_obj_t * copy)
         /*Set the default styles*/
         lv_theme_t * th = lv_theme_get_current();
         if(th) {
-            lv_chart_set_style(new_chart, th->style.chart);
+            lv_chart_set_style(new_chart, LV_CHART_STYLE_MAIN, th->style.chart);
         } else {
-            lv_chart_set_style(new_chart, &lv_style_pretty);
+            lv_chart_set_style(new_chart, LV_CHART_STYLE_MAIN, &lv_style_pretty);
         }
 
     } else {
diff --git a/src/lv_objx/lv_chart.h b/src/lv_objx/lv_chart.h
index 3c3b60196..0ef9e645b 100644
--- a/src/lv_objx/lv_chart.h
+++ b/src/lv_objx/lv_chart.h
@@ -97,6 +97,11 @@ typedef struct
     } series;
 } lv_chart_ext_t;
 
+enum {
+    LV_CHART_STYLE_MAIN,
+};
+typedef uint8_t lv_chart_style_t;
+
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
@@ -218,10 +223,12 @@ void lv_chart_set_update_mode(lv_obj_t * chart, lv_chart_update_mode_t update_mo
 /**
  * Set the style of a chart
  * @param chart pointer to a chart object
+ * @param type which style should be set (can be only `LV_CHART_STYLE_MAIN`)
  * @param style pointer to a style
  */
-static inline void lv_chart_set_style(lv_obj_t * chart, const lv_style_t * style)
+static inline void lv_chart_set_style(lv_obj_t * chart, lv_chart_style_t type, const lv_style_t * style)
 {
+    (void) type; /*Unused*/
     lv_obj_set_style(chart, style);
 }
 
@@ -290,10 +297,12 @@ lv_opa_t lv_chart_get_series_darking(const lv_obj_t * chart);
 /**
  * Get the style of an chart object
  * @param chart pointer to an chart object
+ * @param type which style should be get (can be only `LV_CHART_STYLE_MAIN`)
  * @return pointer to the chart's style
  */
-static inline const lv_style_t * lv_chart_get_style(const lv_obj_t * chart)
+static inline const lv_style_t * lv_chart_get_style(const lv_obj_t * chart, lv_chart_style_t type)
 {
+    (void) type; /*Unused*/
     return lv_obj_get_style(chart);
 }
 
diff --git a/src/lv_objx/lv_cont.c b/src/lv_objx/lv_cont.c
index 79443fbf7..07348d5cc 100644
--- a/src/lv_objx/lv_cont.c
+++ b/src/lv_objx/lv_cont.c
@@ -90,9 +90,9 @@ lv_obj_t * lv_cont_create(lv_obj_t * par, const lv_obj_t * copy)
         /*Set the default styles*/
         lv_theme_t * th = lv_theme_get_current();
         if(th) {
-            lv_cont_set_style(new_cont, th->style.cont);
+            lv_cont_set_style(new_cont, LV_CONT_STYLE_MAIN, th->style.cont);
         } else {
-            lv_cont_set_style(new_cont, &lv_style_pretty);
+            lv_cont_set_style(new_cont, LV_CONT_STYLE_MAIN, &lv_style_pretty);
         }
     }
     /*Copy an existing object*/
diff --git a/src/lv_objx/lv_cont.h b/src/lv_objx/lv_cont.h
index a53b50245..22a3a1ff7 100644
--- a/src/lv_objx/lv_cont.h
+++ b/src/lv_objx/lv_cont.h
@@ -66,6 +66,12 @@ typedef struct
     uint8_t fit_bottom : 2; /*A fit type from `lv_fit_t` enum */
 } lv_cont_ext_t;
 
+/*Styles*/
+enum {
+    LV_CONT_STYLE_MAIN,
+};
+typedef uint8_t lv_cont_style_t;
+
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
@@ -126,10 +132,12 @@ static inline void lv_cont_set_fit(lv_obj_t * cont, lv_fit_t fit)
 /**
  * Set the style of a container
  * @param cont pointer to a container object
+ * @param type which style should be set (can be only `LV_CONT_STYLE_MAIN`)
  * @param style pointer to the new style
  */
-static inline void lv_cont_set_style(lv_obj_t * cont, const lv_style_t * style)
+static inline void lv_cont_set_style(lv_obj_t * cont, lv_cont_style_t type, const lv_style_t * style)
 {
+    (void) type;    /*Unused*/
     lv_obj_set_style(cont, style);
 }
 
@@ -175,10 +183,12 @@ lv_fit_t lv_cont_get_fit_bottom(const lv_obj_t * cont);
 /**
  * Get the style of a container
  * @param cont pointer to a container object
+ * @param type which style should be get (can be only `LV_CONT_STYLE_MAIN`)
  * @return pointer to the container's style
  */
-static inline const lv_style_t * lv_cont_get_style(const lv_obj_t * cont)
+static inline const lv_style_t * lv_cont_get_style(const lv_obj_t * cont, lv_cont_style_t type)
 {
+    (void) type;    /*Unused*/
     return lv_obj_get_style(cont);
 }
 
diff --git a/src/lv_objx/lv_gauge.c b/src/lv_objx/lv_gauge.c
index 438eec5ec..cf2eeffd4 100644
--- a/src/lv_objx/lv_gauge.c
+++ b/src/lv_objx/lv_gauge.c
@@ -95,9 +95,9 @@ lv_obj_t * lv_gauge_create(lv_obj_t * par, const lv_obj_t * copy)
         /*Set the default styles*/
         lv_theme_t * th = lv_theme_get_current();
         if(th) {
-            lv_gauge_set_style(new_gauge, th->style.gauge);
+            lv_gauge_set_style(new_gauge, LV_GAUGE_STYLE_MAIN, th->style.gauge);
         } else {
-            lv_gauge_set_style(new_gauge, &lv_style_pretty_color);
+            lv_gauge_set_style(new_gauge, LV_GAUGE_STYLE_MAIN, &lv_style_pretty_color);
         }
     }
     /*Copy an existing gauge*/
@@ -394,7 +394,7 @@ static void lv_gauge_draw_needle(lv_obj_t * gauge, const lv_area_t * mask)
 {
     lv_style_t style_needle;
     lv_gauge_ext_t * ext     = lv_obj_get_ext_attr(gauge);
-    const lv_style_t * style = lv_gauge_get_style(gauge);
+    const lv_style_t * style = lv_gauge_get_style(gauge, LV_GAUGE_STYLE_MAIN);
     lv_opa_t opa_scale       = lv_obj_get_opa_scale(gauge);
 
     lv_coord_t r      = lv_obj_get_width(gauge) / 2 - style->body.padding.left;
diff --git a/src/lv_objx/lv_gauge.h b/src/lv_objx/lv_gauge.h
index 2b91545fd..3d953cfab 100644
--- a/src/lv_objx/lv_gauge.h
+++ b/src/lv_objx/lv_gauge.h
@@ -50,6 +50,12 @@ typedef struct
     uint8_t label_count;              /*Number of labels on the scale*/
 } lv_gauge_ext_t;
 
+/*Styles*/
+enum {
+    LV_GAUGE_STYLE_MAIN,
+};
+typedef uint8_t lv_gauge_style_t;
+
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
@@ -117,11 +123,13 @@ void lv_gauge_set_scale(lv_obj_t * gauge, uint16_t angle, uint8_t line_cnt, uint
 /**
  * Set the styles of a gauge
  * @param gauge pointer to a gauge object
- * @param bg set the style of the gauge
+ * @param type which style should be set (can be only `LV_GAUGE_STYLE_MAIN`)
+ * @param style set the style of the gauge
  *  */
-static inline void lv_gauge_set_style(lv_obj_t * gauge, lv_style_t * bg)
+static inline void lv_gauge_set_style(lv_obj_t * gauge, lv_gauge_style_t type, lv_style_t * style)
 {
-    lv_obj_set_style(gauge, bg);
+    (void) type; /*Unused*/
+    lv_obj_set_style(gauge, style);
 }
 
 /*=====================
@@ -203,10 +211,12 @@ static inline uint16_t lv_gauge_get_scale_angle(const lv_obj_t * gauge)
 /**
  * Get the style of a gauge
  * @param gauge pointer to a gauge object
+ * @param type which style should be get (can be only `LV_GAUGE_STYLE_MAIN`)
  * @return pointer to the gauge's style
  */
-static inline const lv_style_t * lv_gauge_get_style(const lv_obj_t * gauge)
+static inline const lv_style_t * lv_gauge_get_style(const lv_obj_t * gauge, lv_gauge_style_t type)
 {
+    (void) type; /*Unused*/
     return lv_obj_get_style(gauge);
 }
 
diff --git a/src/lv_objx/lv_img.c b/src/lv_objx/lv_img.c
index 92b4a5cc5..091362bfe 100644
--- a/src/lv_objx/lv_img.c
+++ b/src/lv_objx/lv_img.c
@@ -173,7 +173,7 @@ void lv_img_set_src(lv_obj_t * img, const void * src_img)
 
     if(src_type == LV_IMG_SRC_SYMBOL) {
         /*`lv_img_dsc_get_info` couldn't set the with and height of a font so set it here*/
-        const lv_style_t * style = lv_img_get_style(img);
+        const lv_style_t * style = lv_img_get_style(img, LV_IMG_STYLE_MAIN);
         lv_point_t size;
         lv_txt_get_size(&size, src_img, style->text.font, style->text.letter_space, style->text.line_space,
                         LV_COORD_MAX, LV_TXT_FLAG_NONE);
diff --git a/src/lv_objx/lv_img.h b/src/lv_objx/lv_img.h
index 5cfaae13a..968f16bdc 100644
--- a/src/lv_objx/lv_img.h
+++ b/src/lv_objx/lv_img.h
@@ -47,6 +47,12 @@ typedef struct
     uint8_t cf : 5;        /*Color format from `lv_img_color_format_t`*/
 } lv_img_ext_t;
 
+/*Styles*/
+enum {
+    LV_IMG_STYLE_MAIN,
+};
+typedef uint8_t lv_img_style_t;
+
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
@@ -118,24 +124,15 @@ void lv_img_set_offset_y(lv_obj_t * img, lv_coord_t y);
 /**
  * Set the style of an image
  * @param img pointer to an image object
+ * @param type which style should be set (can be only `LV_IMG_STYLE_MAIN`)
  * @param style pointer to a style
  */
-static inline void lv_img_set_style(lv_obj_t * img, const lv_style_t * style)
+static inline void lv_img_set_style(lv_obj_t * img, lv_img_style_t type, const lv_style_t * style)
 {
+    (void)type; /*Unused*/
     lv_obj_set_style(img, style);
 }
 
-/**
- * Obsolete since v5.1. Just for compatibility with v5.0. Will be removed in v6.0
- * @param img -
- * @param upscale -
- */
-static inline void lv_img_set_upscale(lv_obj_t * img, bool upcale)
-{
-    (void)img;
-    (void)upcale;
-}
-
 /*=====================
  * Getter functions
  *====================*/
@@ -178,24 +175,15 @@ lv_coord_t lv_img_get_offset_y(lv_obj_t * img);
 /**
  * Get the style of an image object
  * @param img pointer to an image object
+ * @param type which style should be get (can be only `LV_IMG_STYLE_MAIN`)
  * @return pointer to the image's style
  */
-static inline const lv_style_t * lv_img_get_style(const lv_obj_t * img)
+static inline const lv_style_t * lv_img_get_style(const lv_obj_t * img, lv_img_style_t type)
 {
+    (void)type;     /*Unused*/
     return lv_obj_get_style(img);
 }
 
-/**
- * Obsolete since v5.1. Just for compatibility with v5.0. Will be removed in v6.0
- * @param img -
- * @return false
- */
-static inline bool lv_img_get_upscale(const lv_obj_t * img)
-{
-    (void)img;
-    return false;
-}
-
 /**********************
  *      MACROS
  **********************/
diff --git a/src/lv_objx/lv_label.c b/src/lv_objx/lv_label.c
index 5ffaea4c2..018bfd78b 100644
--- a/src/lv_objx/lv_label.c
+++ b/src/lv_objx/lv_label.c
@@ -110,7 +110,7 @@ lv_obj_t * lv_label_create(lv_obj_t * par, const lv_obj_t * copy)
         lv_obj_set_click(new_label, false);
         lv_label_set_long_mode(new_label, LV_LABEL_LONG_EXPAND);
         lv_label_set_text(new_label, "Text");
-        lv_label_set_style(new_label, NULL); /*Inherit parent's style*/
+        lv_label_set_style(new_label, LV_LABEL_STYLE_MAIN, NULL); /*Inherit parent's style*/
     }
     /*Copy 'copy' if not NULL*/
     else {
@@ -683,8 +683,8 @@ bool lv_label_is_char_under_pos(const lv_obj_t * label, lv_point_t * pos)
 
     uint32_t i         = line_start;
     uint32_t i_current = i;
-    uint32_t letter;
-    uint32_t letter_next;
+    uint32_t letter = '\0';
+    uint32_t letter_next = '\0';
 
     if(new_line_start > 0) {
         while(i <= new_line_start - 1) {
@@ -911,7 +911,7 @@ static lv_res_t lv_label_signal(lv_obj_t * label, lv_signal_t sign, void * param
         }
     } else if(sign == LV_SIGNAL_REFR_EXT_DRAW_PAD) {
         if(ext->body_draw) {
-            const lv_style_t * style = lv_label_get_style(label);
+            const lv_style_t * style = lv_label_get_style(label, LV_LABEL_STYLE_MAIN);
 
             label->ext_draw_pad = LV_MATH_MAX(label->ext_draw_pad, style->body.padding.left);
             label->ext_draw_pad = LV_MATH_MAX(label->ext_draw_pad, style->body.padding.right);
diff --git a/src/lv_objx/lv_label.h b/src/lv_objx/lv_label.h
index 5a445015d..4a7c8c8ad 100644
--- a/src/lv_objx/lv_label.h
+++ b/src/lv_objx/lv_label.h
@@ -91,6 +91,12 @@ typedef struct
                                   characters */
 } lv_label_ext_t;
 
+/*Styles*/
+enum {
+    LV_LABEL_STYLE_MAIN,
+};
+typedef uint8_t lv_label_style_t;
+
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
@@ -171,10 +177,12 @@ void lv_label_set_anim_speed(lv_obj_t * label, uint16_t anim_speed);
 /**
  * Set the style of an label
  * @param label pointer to an label object
+ * @param type which style should be get (can be only `LV_LABEL_STYLE_MAIN`)
  * @param style pointer to a style
  */
-static inline void lv_label_set_style(lv_obj_t * label, const lv_style_t * style)
+static inline void lv_label_set_style(lv_obj_t * label, lv_label_style_t type, const lv_style_t * style)
 {
+    (void) type; /*Unused*/
     lv_obj_set_style(label, style);
 }
 
@@ -267,10 +275,12 @@ bool lv_label_is_char_under_pos(const lv_obj_t * label, lv_point_t * pos);
 /**
  * Get the style of an label object
  * @param label pointer to an label object
+ * @param type which style should be get (can be only `LV_LABEL_STYLE_MAIN`)
  * @return pointer to the label's style
  */
-static inline const lv_style_t * lv_label_get_style(const lv_obj_t * label)
+static inline const lv_style_t * lv_label_get_style(const lv_obj_t * label, lv_label_style_t type)
 {
+    (void) type;    /*Unused*/
     return lv_obj_get_style(label);
 }
 
diff --git a/src/lv_objx/lv_led.c b/src/lv_objx/lv_led.c
index 5cd15bca8..c991b518b 100644
--- a/src/lv_objx/lv_led.c
+++ b/src/lv_objx/lv_led.c
@@ -79,9 +79,9 @@ lv_obj_t * lv_led_create(lv_obj_t * par, const lv_obj_t * copy)
         /*Set the default styles*/
         lv_theme_t * th = lv_theme_get_current();
         if(th) {
-            lv_led_set_style(new_led, th->style.led);
+            lv_led_set_style(new_led, LV_LED_STYLE_MAIN, th->style.led);
         } else {
-            lv_led_set_style(new_led, &lv_style_pretty_color);
+            lv_led_set_style(new_led, LV_LED_STYLE_MAIN, &lv_style_pretty_color);
         }
     }
     /*Copy an existing object*/
diff --git a/src/lv_objx/lv_led.h b/src/lv_objx/lv_led.h
index 957c2ae09..530be5c57 100644
--- a/src/lv_objx/lv_led.h
+++ b/src/lv_objx/lv_led.h
@@ -39,6 +39,12 @@ typedef struct
     uint8_t bright; /*Current brightness of the LED (0..255)*/
 } lv_led_ext_t;
 
+/*Styles*/
+enum {
+    LV_LED_STYLE_MAIN,
+};
+typedef uint8_t lv_led_style_t;
+
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
@@ -79,10 +85,12 @@ void lv_led_toggle(lv_obj_t * led);
 /**
  * Set the style of a led
  * @param led pointer to a led object
+ * @param type which style should be set (can be only `LV_LED_STYLE_MAIN`)
  * @param style pointer to a style
  */
-static inline void lv_led_set_style(lv_obj_t * led, const lv_style_t * style)
+static inline void lv_led_set_style(lv_obj_t * led, lv_led_style_t type,  const lv_style_t * style)
 {
+    (void) type; /*Unused*/
     lv_obj_set_style(led, style);
 }
 
@@ -96,10 +104,12 @@ uint8_t lv_led_get_bright(const lv_obj_t * led);
 /**
  * Get the style of an led object
  * @param led pointer to an led object
+ * @param type which style should be get (can be only `LV_CHART_STYLE_MAIN`)
  * @return pointer to the led's style
  */
-static inline const lv_style_t * lv_led_get_style(const lv_obj_t * led)
+static inline const lv_style_t * lv_led_get_style(const lv_obj_t * led, lv_led_style_t type)
 {
+    (void) type;    /*Unused*/
     return lv_obj_get_style(led);
 }
 
diff --git a/src/lv_objx/lv_line.c b/src/lv_objx/lv_line.c
index abe6f5a96..3831449a0 100644
--- a/src/lv_objx/lv_line.c
+++ b/src/lv_objx/lv_line.c
@@ -120,7 +120,7 @@ void lv_line_set_points(lv_obj_t * line, const lv_point_t point_a[], uint16_t po
             ymax = LV_MATH_MAX(point_a[i].y, ymax);
         }
 
-        const lv_style_t * style = lv_line_get_style(line);
+        const lv_style_t * style = lv_line_get_style(line, LV_LINE_STYLE_MAIN);
         lv_obj_set_size(line, xmax + style->line.width, ymax + style->line.width);
     }
 
@@ -291,7 +291,7 @@ static lv_res_t lv_line_signal(lv_obj_t * line, lv_signal_t sign, void * param)
         }
         buf->type[i] = "lv_line";
     } else if(sign == LV_SIGNAL_REFR_EXT_DRAW_PAD) {
-        const lv_style_t * style = lv_line_get_style(line);
+        const lv_style_t * style = lv_line_get_style(line, LV_LINE_STYLE_MAIN);
         if(line->ext_draw_pad < style->line.width) line->ext_draw_pad = style->line.width;
     }
 
diff --git a/src/lv_objx/lv_line.h b/src/lv_objx/lv_line.h
index 9c89d96bc..ad677c9fb 100644
--- a/src/lv_objx/lv_line.h
+++ b/src/lv_objx/lv_line.h
@@ -41,6 +41,12 @@ typedef struct
     uint8_t y_inv : 1;                                 /*1: y == 0 will be on the bottom*/
 } lv_line_ext_t;
 
+/*Styles*/
+enum {
+    LV_LINE_STYLE_MAIN,
+};
+typedef uint8_t lv_line_style_t;
+
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
@@ -89,23 +95,15 @@ void lv_line_set_y_invert(lv_obj_t * line, bool en);
 /**
  * Set the style of a line
  * @param line pointer to a line object
+ * @param type which style should be set (can be only `LV_LINE_STYLE_MAIN`)
  * @param style pointer to a style
  */
-static inline void lv_line_set_style(lv_obj_t * line, const lv_style_t * style)
+static inline void lv_line_set_style(lv_obj_t * line, lv_line_style_t type, const lv_style_t * style)
 {
+    (void) type;    /*Unused*/
     lv_obj_set_style(line, style);
 }
 
-/**
- * Obsolete since v5.1. Just for compatibility with v5.0. Will be removed in v6.0
- * @param line -
- * @param upscale -
- */
-static inline void lv_line_set_upscale(lv_obj_t * line, bool upcale)
-{
-    (void)line;
-    (void)upcale;
-}
 /*=====================
  * Getter functions
  *====================*/
@@ -127,24 +125,15 @@ bool lv_line_get_y_invert(const lv_obj_t * line);
 /**
  * Get the style of an line object
  * @param line pointer to an line object
+ * @param type which style should be get (can be only `LV_LINE_STYLE_MAIN`)
  * @return pointer to the line's style
  */
-static inline const lv_style_t * lv_line_get_style(const lv_obj_t * line)
+static inline const lv_style_t * lv_line_get_style(const lv_obj_t * line, lv_line_style_t type)
 {
+    (void) type;    /*Unused*/
     return lv_obj_get_style(line);
 }
 
-/**
- * Obsolete since v5.1. Just for compatibility with v5.0. Will be removed in v6.0
- * @param line -
- * @return false
- */
-static inline bool lv_line_get_upscale(const lv_obj_t * line)
-{
-    (void)line;
-    return false;
-}
-
 /**********************
  *      MACROS
  **********************/
diff --git a/src/lv_objx/lv_lmeter.c b/src/lv_objx/lv_lmeter.c
index d414c5cce..78f7a8e61 100644
--- a/src/lv_objx/lv_lmeter.c
+++ b/src/lv_objx/lv_lmeter.c
@@ -85,9 +85,9 @@ lv_obj_t * lv_lmeter_create(lv_obj_t * par, const lv_obj_t * copy)
         /*Set the default styles*/
         lv_theme_t * th = lv_theme_get_current();
         if(th) {
-            lv_lmeter_set_style(new_lmeter, th->style.lmeter);
+            lv_lmeter_set_style(new_lmeter, LV_LMETER_STYLE_MAIN, th->style.lmeter);
         } else {
-            lv_lmeter_set_style(new_lmeter, &lv_style_pretty_color);
+            lv_lmeter_set_style(new_lmeter, LV_LMETER_STYLE_MAIN, &lv_style_pretty_color);
         }
     }
     /*Copy an existing line meter*/
@@ -341,7 +341,7 @@ static lv_res_t lv_lmeter_signal(lv_obj_t * lmeter, lv_signal_t sign, void * par
     } else if(sign == LV_SIGNAL_STYLE_CHG) {
         lv_obj_refresh_ext_draw_pad(lmeter);
     } else if(sign == LV_SIGNAL_REFR_EXT_DRAW_PAD) {
-        const lv_style_t * style = lv_lmeter_get_style(lmeter);
+        const lv_style_t * style = lv_lmeter_get_style(lmeter, LV_LMETER_STYLE_MAIN);
         lmeter->ext_draw_pad     = LV_MATH_MAX(lmeter->ext_draw_pad, style->line.width);
     } else if(sign == LV_SIGNAL_GET_TYPE) {
         lv_obj_type_t * buf = param;
diff --git a/src/lv_objx/lv_lmeter.h b/src/lv_objx/lv_lmeter.h
index 9650985d0..e83ccbfb8 100644
--- a/src/lv_objx/lv_lmeter.h
+++ b/src/lv_objx/lv_lmeter.h
@@ -42,6 +42,12 @@ typedef struct
     int16_t max_value;
 } lv_lmeter_ext_t;
 
+/*Styles*/
+enum {
+    LV_LMETER_STYLE_MAIN,
+};
+typedef uint8_t lv_lmeter_style_t;
+
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
@@ -85,11 +91,13 @@ void lv_lmeter_set_scale(lv_obj_t * lmeter, uint16_t angle, uint8_t line_cnt);
 /**
  * Set the styles of a line meter
  * @param lmeter pointer to a line meter object
- * @param bg set the style of the line meter
+ * @param type which style should be set (can be only `LV_LMETER_STYLE_MAIN`)
+ * @param style set the style of the line meter
  */
-static inline void lv_lmeter_set_style(lv_obj_t * lmeter, lv_style_t * bg)
+static inline void lv_lmeter_set_style(lv_obj_t * lmeter, lv_lmeter_style_t type, lv_style_t * style)
 {
-    lv_obj_set_style(lmeter, bg);
+    (void) type;    /*Unused*/
+    lv_obj_set_style(lmeter, style);
 }
 
 /*=====================
@@ -134,10 +142,12 @@ uint16_t lv_lmeter_get_scale_angle(const lv_obj_t * lmeter);
 /**
  * Get the style of a line meter
  * @param lmeter pointer to a line meter object
+ * @param type which style should be get (can be only `LV_LMETER_STYLE_MAIN`)
  * @return pointer to the line meter's style
  */
-static inline const lv_style_t * lv_lmeter_get_style(const lv_obj_t * lmeter)
+static inline const lv_style_t * lv_lmeter_get_style(const lv_obj_t * lmeter, lv_lmeter_style_t type)
 {
+    (void) type;    /*Unused*/
     return lv_obj_get_style(lmeter);
 }
 
diff --git a/src/lv_objx/lv_ta.c b/src/lv_objx/lv_ta.c
index a1155182b..7f6f112df 100644
--- a/src/lv_objx/lv_ta.c
+++ b/src/lv_objx/lv_ta.c
@@ -791,7 +791,7 @@ void lv_ta_set_style(lv_obj_t * ta, lv_ta_style_t type, const lv_style_t * style
             refr_cursor_area(ta);
             break;
         case LV_TA_STYLE_PLACEHOLDER:
-            if(ext->placeholder) lv_label_set_style(ext->placeholder, style);
+            if(ext->placeholder) lv_label_set_style(ext->placeholder, LV_LABEL_STYLE_MAIN, style);
             break;
     }
 }
@@ -1003,7 +1003,7 @@ const lv_style_t * lv_ta_get_style(const lv_obj_t * ta, lv_ta_style_t type)
         case LV_TA_STYLE_EDGE_FLASH: style = lv_page_get_style(ta, LV_PAGE_STYLE_EDGE_FLASH); break;
         case LV_TA_STYLE_CURSOR: style = ext->cursor.style; break;
         case LV_TA_STYLE_PLACEHOLDER:
-            if(ext->placeholder) style = lv_label_get_style(ext->placeholder);
+            if(ext->placeholder) style = lv_label_get_style(ext->placeholder, LV_LABEL_STYLE_MAIN);
             break;
         default: style = NULL; break;
     }
diff --git a/src/lv_objx/lv_tabview.c b/src/lv_objx/lv_tabview.c
index d4b1a3062..d50a00a79 100644
--- a/src/lv_objx/lv_tabview.c
+++ b/src/lv_objx/lv_tabview.c
@@ -128,7 +128,7 @@ lv_obj_t * lv_tabview_create(lv_obj_t * par, const lv_obj_t * copy)
 
         lv_cont_set_fit2(ext->content, LV_FIT_TIGHT, LV_FIT_NONE);
         lv_cont_set_layout(ext->content, LV_LAYOUT_ROW_T);
-        lv_cont_set_style(ext->content, &lv_style_transp_tight);
+        lv_cont_set_style(ext->content, LV_CONT_STYLE_MAIN, &lv_style_transp_tight);
         lv_obj_set_height(ext->content, lv_obj_get_height(new_tabview) - lv_obj_get_height(ext->btns));
         lv_obj_align(ext->content, ext->btns, LV_ALIGN_OUT_BOTTOM_LEFT, 0, 0);