diff --git a/porting/lv_port_disp_template.c b/porting/lv_port_disp_template.c
index 1f4502720..ebd044e68 100644
--- a/porting/lv_port_disp_template.c
+++ b/porting/lv_port_disp_template.c
@@ -160,7 +160,7 @@ static void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_colo
 
 /* If your MCU has hardware accelerator (GPU) then you can use it to blend to memories using opacity
  * It can be used only in buffered mode (LV_VDB_SIZE != 0 in lv_conf.h)*/
-static void mem_blend(lv_color_t * dest, const lv_color_t * src, uint32_t length, lv_opa_t opa)
+static void mem_blend(lv_disp_drv_t * disp_drv, lv_color_t * dest, const lv_color_t * src, uint32_t length, lv_opa_t opa)
 {
     /*It's an example code which should be done by your GPU*/
 
@@ -172,7 +172,8 @@ static void mem_blend(lv_color_t * dest, const lv_color_t * src, uint32_t length
 
 /* If your MCU has hardware accelerator (GPU) then you can use it to fill a memory with a color
  * It can be used only in buffered mode (LV_VDB_SIZE != 0 in lv_conf.h)*/
-static void mem_fill(lv_color_t * dest, uint32_t length, lv_color_t color)
+static void mem_fill(lv_disp_drv_t * disp_drv, lv_color_t * dest_buf, const lv_area_t * dest_area,
+                      const lv_area_t * fill_area, lv_color_t color);
 {
     /*It's an example code which should be done by your GPU*/
 
diff --git a/src/lv_core/lv_group.c b/src/lv_core/lv_group.c
index e945d5375..5b173b149 100644
--- a/src/lv_core/lv_group.c
+++ b/src/lv_core/lv_group.c
@@ -618,8 +618,8 @@ static void refresh_theme(lv_group_t * g, lv_theme_t * th)
     g->style_mod_cb      = style_mod_def;
     g->style_mod_edit_cb = style_mod_edit_def;
     if(th) {
-        if(th->group.style_mod_cb) g->style_mod_cb = th->group.style_mod_cb;
-        if(th->group.style_mod_edit_cb) g->style_mod_edit_cb = th->group.style_mod_edit_cb;
+        if(th->group.style_mod_xcb) g->style_mod_cb = th->group.style_mod_xcb;
+        if(th->group.style_mod_edit_xcb) g->style_mod_edit_cb = th->group.style_mod_edit_xcb;
     }
 }
 
diff --git a/src/lv_core/lv_obj.c b/src/lv_core/lv_obj.c
index abc68354b..ec5b9a370 100644
--- a/src/lv_core/lv_obj.c
+++ b/src/lv_core/lv_obj.c
@@ -1323,13 +1323,15 @@ lv_res_t lv_event_send(lv_obj_t * obj, lv_event_t event, const void * data)
 
 /**
  * Call an event function with an object, event, and data.
- * @param event_cb an event callback function. If `NULL` `LV_RES_OK` will return without any actions.
+ * @param event_xcb an event callback function. If `NULL` `LV_RES_OK` will return without any actions.
+ *        (the 'x' in the argument name indicates that its not a fully generic function because it not follows
+ *         the `func_name(object, callback, ...)` convention)
  * @param obj pointer to an object to associate with the event (can be `NULL` to simply call the `event_cb`)
  * @param event an event
  * @param data pointer to a custom data
  * @return LV_RES_OK: `obj` was not deleted in the event; LV_RES_INV: `obj` was deleted in the event
  */
-lv_res_t lv_event_send_func(lv_event_cb_t event_cb, lv_obj_t * obj, lv_event_t event, const void * data)
+lv_res_t lv_event_send_func(lv_event_cb_t event_xcb, lv_obj_t * obj, lv_event_t event, const void * data)
 {
     /* Build a simple linked list from the objects used in the events
      * It's important to know if an this object was deleted by a nested event
@@ -1354,7 +1356,7 @@ lv_res_t lv_event_send_func(lv_event_cb_t event_cb, lv_obj_t * obj, lv_event_t e
     }
 
     /*Call the event callback itself*/
-    if(event_cb) event_cb(obj, event);
+    if(event_xcb) event_xcb(obj, event);
 
     /*Restore the event data*/
     event_act_data = event_act_data_save;
diff --git a/src/lv_core/lv_style.c b/src/lv_core/lv_style.c
index 160032144..24d4d2ffc 100644
--- a/src/lv_core/lv_style.c
+++ b/src/lv_core/lv_style.c
@@ -281,7 +281,7 @@ void lv_style_anim_init(lv_anim_t * a)
     lv_anim_init(a);
     a->start    = 0;
     a->end      = STYLE_MIX_MAX;
-    a->exec_cb  = (lv_anim_exec_cb_t)style_animator;
+    a->exec_cb  = (lv_anim_exec_xcb_t)style_animator;
     a->path_cb  = lv_anim_path_linear;
     a->ready_cb = style_animation_common_end_cb;
 
diff --git a/src/lv_misc/lv_anim.c b/src/lv_misc/lv_anim.c
index 6961a4927..88ee70057 100644
--- a/src/lv_misc/lv_anim.c
+++ b/src/lv_misc/lv_anim.c
@@ -111,7 +111,7 @@ void lv_anim_create(lv_anim_t * a)
  *           or NULL to delete all the animations of 'var'
  * @return true: at least 1 animation is deleted, false: no animation is deleted
  */
-bool lv_anim_del(void * var, lv_anim_exec_cb_t exec_cb)
+bool lv_anim_del(void * var, lv_anim_exec_xcb_t exec_cb)
 {
     lv_anim_t * a;
     lv_anim_t * a_next;
diff --git a/src/lv_misc/lv_anim.h b/src/lv_misc/lv_anim.h
index bba9d25b4..dae12fd37 100644
--- a/src/lv_misc/lv_anim.h
+++ b/src/lv_misc/lv_anim.h
@@ -41,8 +41,10 @@ typedef int16_t lv_anim_value_t;
 /* Generic prototype of "animator" functions.
  * First parameter is the variable to animate.
  * Second parameter is the value to set.
- * Compatible with `lv_xxx_set_yyy(obj, value)` functions*/
-typedef void (*lv_anim_exec_cb_t)(void *, lv_anim_value_t);
+ * Compatible with `lv_xxx_set_yyy(obj, value)` functions
+ * The `x` in `_xcb_t` means its not a fully generic prototype because
+ * it doesn't receive `lv_anim_t *` as its first argument*/
+typedef void (*lv_anim_exec_xcb_t)(void *, lv_anim_value_t);
 
 /* Same as `lv_anim_exec_cb_t` but receives `lv_anim_t *` as the first parameter.
  * It's more consistent but less convenient. Might be used by binding generator functions.*/
@@ -58,7 +60,7 @@ typedef void (*lv_anim_ready_cb_t)(struct _lv_anim_t *);
 typedef struct _lv_anim_t
 {
     void * var;                  /*Variable to animate*/
-    lv_anim_exec_cb_t exec_cb;   /*Function to execute to animate*/
+    lv_anim_exec_xcb_t exec_cb;   /*Function to execute to animate*/
     lv_anim_path_cb_t path_cb;   /*An array with the steps of animations*/
     lv_anim_ready_cb_t ready_cb; /*Call it when the animation is ready*/
     int32_t start;               /*Start value*/
@@ -114,7 +116,7 @@ void lv_anim_init(lv_anim_t * a);
  *                LittelvGL's built-in functions can be used.
  *                E.g. lv_obj_set_x
  */
-static inline void lv_anim_set_exec_cb(lv_anim_t * a, void * var, lv_anim_exec_cb_t exec_cb)
+static inline void lv_anim_set_exec_cb(lv_anim_t * a, void * var, lv_anim_exec_xcb_t exec_cb)
 {
     a->var     = var;
     a->exec_cb = exec_cb;
@@ -155,7 +157,7 @@ static inline void lv_anim_set_values(lv_anim_t * a, lv_anim_value_t start, lv_a
 static inline void lv_anim_set_custom_exec_cb(lv_anim_t * a, lv_anim_custom_exec_cb_t exec_cb)
 {
     a->var     = a;
-    a->exec_cb = (lv_anim_exec_cb_t)exec_cb;
+    a->exec_cb = (lv_anim_exec_xcb_t)exec_cb;
 }
 
 /**
@@ -262,7 +264,7 @@ void lv_anim_create(lv_anim_t * a);
  *           or NULL to ignore it and delete all the animations of 'var
  * @return true: at least 1 animation is deleted, false: no animation is deleted
  */
-bool lv_anim_del(void * var, lv_anim_exec_cb_t exec_cb);
+bool lv_anim_del(void * var, lv_anim_exec_xcb_t exec_cb);
 
 /**
  * Delete an aniamation by getting the animated variable from `a`.
@@ -277,7 +279,7 @@ bool lv_anim_del(void * var, lv_anim_exec_cb_t exec_cb);
  */
 static inline bool lv_anim_custom_del(lv_anim_t * a, lv_anim_custom_exec_cb_t exec_cb)
 {
-    return lv_anim_del(a->var, (lv_anim_exec_cb_t)exec_cb);
+    return lv_anim_del(a->var, (lv_anim_exec_xcb_t)exec_cb);
 }
 
 /**
diff --git a/src/lv_objx/lv_bar.c b/src/lv_objx/lv_bar.c
index 9e4a74f20..853a6383d 100644
--- a/src/lv_objx/lv_bar.c
+++ b/src/lv_objx/lv_bar.c
@@ -162,7 +162,7 @@ void lv_bar_set_value(lv_obj_t * bar, int16_t value, lv_anim_enable_t anim)
         a.var            = bar;
         a.start          = LV_BAR_ANIM_STATE_START;
         a.end            = LV_BAR_ANIM_STATE_END;
-        a.exec_cb        = (lv_anim_exec_cb_t)lv_bar_anim;
+        a.exec_cb        = (lv_anim_exec_xcb_t)lv_bar_anim;
         a.path_cb        = lv_anim_path_linear;
         a.ready_cb       = lv_bar_anim_ready;
         a.act_time       = 0;
diff --git a/src/lv_objx/lv_btn.c b/src/lv_objx/lv_btn.c
index 6cdbe3b90..c13fe21bd 100644
--- a/src/lv_objx/lv_btn.c
+++ b/src/lv_objx/lv_btn.c
@@ -506,7 +506,7 @@ static lv_res_t lv_btn_signal(lv_obj_t * btn, lv_signal_t sign, void * param)
 #if LV_USE_ANIMATION && LV_BTN_INK_EFFECT
         /*Forget the old inked button*/
         if(ink_obj != NULL && ink_obj != btn) {
-            lv_anim_del(ink_obj, (lv_anim_exec_cb_t)lv_btn_ink_effect_anim);
+            lv_anim_del(ink_obj, (lv_anim_exec_xcb_t)lv_btn_ink_effect_anim);
             lv_obj_invalidate(ink_obj);
             ink_obj = NULL;
         }
@@ -521,7 +521,7 @@ static lv_res_t lv_btn_signal(lv_obj_t * btn, lv_signal_t sign, void * param)
             a.var            = btn;
             a.start          = 0;
             a.end            = LV_BTN_INK_VALUE_MAX;
-            a.exec_cb        = (lv_anim_exec_cb_t)lv_btn_ink_effect_anim;
+            a.exec_cb        = (lv_anim_exec_xcb_t)lv_btn_ink_effect_anim;
             a.path_cb        = lv_anim_path_linear;
             a.ready_cb       = lv_btn_ink_effect_anim_ready;
             a.act_time       = 0;
@@ -590,7 +590,7 @@ static lv_res_t lv_btn_signal(lv_obj_t * btn, lv_signal_t sign, void * param)
             a.var            = ink_obj;
             a.start          = LV_BTN_INK_VALUE_MAX;
             a.end            = 0;
-            a.exec_cb        = (lv_anim_exec_cb_t)lv_btn_ink_effect_anim;
+            a.exec_cb        = (lv_anim_exec_xcb_t)lv_btn_ink_effect_anim;
             a.path_cb        = lv_anim_path_linear;
             a.ready_cb       = lv_btn_ink_effect_anim_ready;
             a.act_time       = 0;
@@ -613,7 +613,7 @@ static lv_res_t lv_btn_signal(lv_obj_t * btn, lv_signal_t sign, void * param)
     } else if(sign == LV_SIGNAL_CLEANUP) {
 #if LV_USE_ANIMATION && LV_BTN_INK_EFFECT
         if(btn == ink_obj) {
-            lv_anim_del(ink_obj, (lv_anim_exec_cb_t)lv_btn_ink_effect_anim);
+            lv_anim_del(ink_obj, (lv_anim_exec_xcb_t)lv_btn_ink_effect_anim);
             ink_obj = NULL;
         }
 #endif
@@ -663,7 +663,7 @@ static void lv_btn_ink_effect_anim_ready(lv_anim_t * a)
         new_a.var            = ink_obj;
         new_a.start          = LV_BTN_INK_VALUE_MAX;
         new_a.end            = 0;
-        new_a.exec_cb        = (lv_anim_exec_cb_t)lv_btn_ink_effect_anim;
+        new_a.exec_cb        = (lv_anim_exec_xcb_t)lv_btn_ink_effect_anim;
         new_a.path_cb        = lv_anim_path_linear;
         new_a.ready_cb       = lv_btn_ink_effect_anim_ready;
         new_a.act_time       = -ext->ink_wait_time;
diff --git a/src/lv_objx/lv_ddlist.c b/src/lv_objx/lv_ddlist.c
index eb7c1577c..4ac1d7827 100644
--- a/src/lv_objx/lv_ddlist.c
+++ b/src/lv_objx/lv_ddlist.c
@@ -863,7 +863,7 @@ static void lv_ddlist_refr_size(lv_obj_t * ddlist, lv_anim_enable_t anim)
         lv_ddlist_pos_current_option(ddlist);
         if(ext->opened) lv_page_set_sb_mode(ddlist, LV_SB_MODE_UNHIDE);
 #if LV_USE_ANIMATION
-        lv_anim_del(ddlist, (lv_anim_exec_cb_t)lv_ddlist_adjust_height); /*If an animation is in progress then
+        lv_anim_del(ddlist, (lv_anim_exec_xcb_t)lv_ddlist_adjust_height); /*If an animation is in progress then
                                                                  it will overwrite this changes*/
 
         /*Force animation complete to fix highlight selection*/
@@ -875,7 +875,7 @@ static void lv_ddlist_refr_size(lv_obj_t * ddlist, lv_anim_enable_t anim)
             a.var            = ddlist;
             a.start          = lv_obj_get_height(ddlist);
             a.end            = new_height;
-            a.exec_cb        = (lv_anim_exec_cb_t)lv_ddlist_adjust_height;
+            a.exec_cb        = (lv_anim_exec_xcb_t)lv_ddlist_adjust_height;
             a.path_cb        = lv_anim_path_linear;
             a.ready_cb       = lv_ddlist_anim_ready_cb;
             a.act_time       = 0;
diff --git a/src/lv_objx/lv_label.c b/src/lv_objx/lv_label.c
index 018bfd78b..8bd32e10e 100644
--- a/src/lv_objx/lv_label.c
+++ b/src/lv_objx/lv_label.c
@@ -265,10 +265,10 @@ void lv_label_set_long_mode(lv_obj_t * label, lv_label_long_mode_t long_mode)
 
 #if LV_USE_ANIMATION
     /*Delete the old animation (if exists)*/
-    lv_anim_del(label, (lv_anim_exec_cb_t)lv_obj_set_x);
-    lv_anim_del(label, (lv_anim_exec_cb_t)lv_obj_set_y);
-    lv_anim_del(label, (lv_anim_exec_cb_t)lv_label_set_offset_x);
-    lv_anim_del(label, (lv_anim_exec_cb_t)lv_label_set_offset_y);
+    lv_anim_del(label, (lv_anim_exec_xcb_t)lv_obj_set_x);
+    lv_anim_del(label, (lv_anim_exec_xcb_t)lv_obj_set_y);
+    lv_anim_del(label, (lv_anim_exec_xcb_t)lv_label_set_offset_x);
+    lv_anim_del(label, (lv_anim_exec_xcb_t)lv_label_set_offset_y);
 #endif
     ext->offset.x = 0;
     ext->offset.y = 0;
@@ -980,25 +980,25 @@ static void lv_label_refr_text(lv_obj_t * label)
         bool hor_anim = false;
         if(size.x > lv_obj_get_width(label)) {
             anim.end     = lv_obj_get_width(label) - size.x;
-            anim.exec_cb = (lv_anim_exec_cb_t)lv_label_set_offset_x;
+            anim.exec_cb = (lv_anim_exec_xcb_t)lv_label_set_offset_x;
             anim.time    = lv_anim_speed_to_time(ext->anim_speed, anim.start, anim.end);
             lv_anim_create(&anim);
             hor_anim = true;
         } else {
             /*Delete the offset animation if not required*/
-            lv_anim_del(label, (lv_anim_exec_cb_t)lv_label_set_offset_x);
+            lv_anim_del(label, (lv_anim_exec_xcb_t)lv_label_set_offset_x);
             ext->offset.x = 0;
         }
 
         if(size.y > lv_obj_get_height(label) && hor_anim == false) {
             anim.end     = lv_obj_get_height(label) - size.y - (lv_font_get_line_height(font));
-            anim.exec_cb = (lv_anim_exec_cb_t)lv_label_set_offset_y;
+            anim.exec_cb = (lv_anim_exec_xcb_t)lv_label_set_offset_y;
 
             anim.time = lv_anim_speed_to_time(ext->anim_speed, anim.start, anim.end);
             lv_anim_create(&anim);
         } else {
             /*Delete the offset animation if not required*/
-            lv_anim_del(label, (lv_anim_exec_cb_t)lv_label_set_offset_y);
+            lv_anim_del(label, (lv_anim_exec_xcb_t)lv_label_set_offset_y);
             ext->offset.y = 0;
         }
 #endif
@@ -1022,24 +1022,24 @@ static void lv_label_refr_text(lv_obj_t * label)
         bool hor_anim = false;
         if(size.x > lv_obj_get_width(label)) {
             anim.end     = -size.x - lv_font_get_glyph_width(font, ' ', ' ') * LV_LABEL_WAIT_CHAR_COUNT;
-            anim.exec_cb = (lv_anim_exec_cb_t)lv_label_set_offset_x;
+            anim.exec_cb = (lv_anim_exec_xcb_t)lv_label_set_offset_x;
             anim.time    = lv_anim_speed_to_time(ext->anim_speed, anim.start, anim.end);
             lv_anim_create(&anim);
             hor_anim = true;
         } else {
             /*Delete the offset animation if not required*/
-            lv_anim_del(label, (lv_anim_exec_cb_t)lv_label_set_offset_x);
+            lv_anim_del(label, (lv_anim_exec_xcb_t)lv_label_set_offset_x);
             ext->offset.x = 0;
         }
 
         if(size.y > lv_obj_get_height(label) && hor_anim == false) {
             anim.end     = -size.y - (lv_font_get_line_height(font));
-            anim.exec_cb = (lv_anim_exec_cb_t)lv_label_set_offset_y;
+            anim.exec_cb = (lv_anim_exec_xcb_t)lv_label_set_offset_y;
             anim.time    = lv_anim_speed_to_time(ext->anim_speed, anim.start, anim.end);
             lv_anim_create(&anim);
         } else {
             /*Delete the offset animation if not required*/
-            lv_anim_del(label, (lv_anim_exec_cb_t)lv_label_set_offset_y);
+            lv_anim_del(label, (lv_anim_exec_xcb_t)lv_label_set_offset_y);
             ext->offset.y = 0;
         }
 #endif
diff --git a/src/lv_objx/lv_list.c b/src/lv_objx/lv_list.c
index 0f67ee0ca..cf4fb87d9 100644
--- a/src/lv_objx/lv_list.c
+++ b/src/lv_objx/lv_list.c
@@ -627,7 +627,7 @@ void lv_list_up(const lv_obj_t * list)
                     a.var            = scrl;
                     a.start          = lv_obj_get_y(scrl);
                     a.end            = new_y;
-                    a.exec_cb        = (lv_anim_exec_cb_t)lv_obj_set_y;
+                    a.exec_cb        = (lv_anim_exec_xcb_t)lv_obj_set_y;
                     a.path_cb        = lv_anim_path_linear;
                     a.ready_cb       = NULL;
                     a.act_time       = 0;
@@ -669,7 +669,7 @@ void lv_list_down(const lv_obj_t * list)
                 a.var            = scrl;
                 a.start          = lv_obj_get_y(scrl);
                 a.end            = new_y;
-                a.exec_cb        = (lv_anim_exec_cb_t)lv_obj_set_y;
+                a.exec_cb        = (lv_anim_exec_xcb_t)lv_obj_set_y;
                 a.path_cb        = lv_anim_path_linear;
                 a.ready_cb       = NULL;
                 a.act_time       = 0;
diff --git a/src/lv_objx/lv_mbox.c b/src/lv_objx/lv_mbox.c
index c59dfc44e..099a4b767 100644
--- a/src/lv_objx/lv_mbox.c
+++ b/src/lv_objx/lv_mbox.c
@@ -210,7 +210,7 @@ void lv_mbox_start_auto_close(lv_obj_t * mbox, uint16_t delay)
         a.var            = mbox;
         a.start          = lv_obj_get_height(mbox);
         a.end            = 0;
-        a.exec_cb        = (lv_anim_exec_cb_t)lv_obj_set_height;
+        a.exec_cb        = (lv_anim_exec_xcb_t)lv_obj_set_height;
         a.path_cb        = lv_anim_path_linear;
         a.ready_cb       = NULL;
         a.act_time       = -delay;
@@ -222,7 +222,7 @@ void lv_mbox_start_auto_close(lv_obj_t * mbox, uint16_t delay)
         lv_anim_create(&a);
 
         a.start    = lv_obj_get_width(mbox);
-        a.exec_cb  = (lv_anim_exec_cb_t)lv_obj_set_width;
+        a.exec_cb  = (lv_anim_exec_xcb_t)lv_obj_set_width;
         a.ready_cb = lv_mbox_close_ready_cb;
         lv_anim_create(&a);
 
@@ -234,7 +234,7 @@ void lv_mbox_start_auto_close(lv_obj_t * mbox, uint16_t delay)
         a.var            = mbox;
         a.start          = 0;
         a.end            = 1;
-        a.exec_cb        = (lv_anim_exec_cb_t)NULL;
+        a.exec_cb        = (lv_anim_exec_xcb_t)NULL;
         a.path_cb        = lv_anim_path_linear;
         a.ready_cb       = lv_mbox_close_ready_cb;
         a.act_time       = -delay;
diff --git a/src/lv_objx/lv_page.c b/src/lv_objx/lv_page.c
index 17d3e9633..eb2210f1b 100644
--- a/src/lv_objx/lv_page.c
+++ b/src/lv_objx/lv_page.c
@@ -445,10 +445,10 @@ void lv_page_focus(lv_obj_t * page, const lv_obj_t * obj, uint16_t anim_time)
 #if LV_USE_ANIMATION
     /* Be sure there is no position changing animation in progress
      * because it can overide the current changes*/
-    lv_anim_del(page, (lv_anim_exec_cb_t)lv_obj_set_x);
-    lv_anim_del(page, (lv_anim_exec_cb_t)lv_obj_set_y);
-    lv_anim_del(ext->scrl, (lv_anim_exec_cb_t)lv_obj_set_x);
-    lv_anim_del(ext->scrl, (lv_anim_exec_cb_t)lv_obj_set_y);
+    lv_anim_del(page, (lv_anim_exec_xcb_t)lv_obj_set_x);
+    lv_anim_del(page, (lv_anim_exec_xcb_t)lv_obj_set_y);
+    lv_anim_del(ext->scrl, (lv_anim_exec_xcb_t)lv_obj_set_x);
+    lv_anim_del(ext->scrl, (lv_anim_exec_xcb_t)lv_obj_set_y);
 #else
     anim_time = 0;
 #endif
@@ -517,12 +517,12 @@ void lv_page_focus(lv_obj_t * page, const lv_obj_t * obj, uint16_t anim_time)
         a.repeat   = 0;
         a.var      = ext->scrl;
         a.path_cb  = lv_anim_path_linear;
-        a.exec_cb  = (lv_anim_exec_cb_t)lv_obj_set_y;
+        a.exec_cb  = (lv_anim_exec_xcb_t)lv_obj_set_y;
         lv_anim_create(&a);
 
         a.start   = lv_obj_get_x(ext->scrl);
         a.end     = scrlable_x;
-        a.exec_cb = (lv_anim_exec_cb_t)lv_obj_set_x;
+        a.exec_cb = (lv_anim_exec_xcb_t)lv_obj_set_x;
         lv_anim_create(&a);
 #endif
     }
@@ -542,7 +542,7 @@ void lv_page_scroll_hor(lv_obj_t * page, lv_coord_t dist)
     a.var            = scrl;
     a.start          = lv_obj_get_x(scrl);
     a.end            = a.start + dist;
-    a.exec_cb        = (lv_anim_exec_cb_t)lv_obj_set_x;
+    a.exec_cb        = (lv_anim_exec_xcb_t)lv_obj_set_x;
     a.path_cb        = lv_anim_path_linear;
     a.ready_cb       = NULL;
     a.act_time       = 0;
@@ -571,7 +571,7 @@ void lv_page_scroll_ver(lv_obj_t * page, lv_coord_t dist)
     a.var            = scrl;
     a.start          = lv_obj_get_y(scrl);
     a.end            = a.start + dist;
-    a.exec_cb        = (lv_anim_exec_cb_t)lv_obj_set_y;
+    a.exec_cb        = (lv_anim_exec_xcb_t)lv_obj_set_y;
     a.path_cb        = lv_anim_path_linear;
     a.ready_cb       = NULL;
     a.act_time       = 0;
@@ -600,7 +600,7 @@ void lv_page_start_edge_flash(lv_obj_t * page)
         a.var            = page;
         a.start          = 0;
         a.end            = LV_PAGE_END_FLASH_SIZE;
-        a.exec_cb        = (lv_anim_exec_cb_t)edge_flash_anim;
+        a.exec_cb        = (lv_anim_exec_xcb_t)edge_flash_anim;
         a.path_cb        = lv_anim_path_linear;
         a.ready_cb       = edge_flash_anim_end;
         a.act_time       = 0;
diff --git a/src/lv_objx/lv_preload.c b/src/lv_objx/lv_preload.c
index f63430405..74aa0fbf8 100644
--- a/src/lv_objx/lv_preload.c
+++ b/src/lv_objx/lv_preload.c
@@ -187,7 +187,7 @@ void lv_preload_set_anim_type(lv_obj_t * preload, lv_preload_type_t type)
                 a.start = 0;
                 a.end   = 360;
             }
-            a.exec_cb        = (lv_anim_exec_cb_t)lv_preload_spinner_anim;
+            a.exec_cb        = (lv_anim_exec_xcb_t)lv_preload_spinner_anim;
             a.path_cb        = lv_anim_path_ease_in_out;
             a.ready_cb       = NULL;
             a.act_time       = 0;
@@ -208,7 +208,7 @@ void lv_preload_set_anim_type(lv_obj_t * preload, lv_preload_type_t type)
                 b.start = ext->arc_length;
                 b.end   = 360 - ext->arc_length;
             }
-            b.exec_cb        = (lv_anim_exec_cb_t)lv_preload_set_arc_length;
+            b.exec_cb        = (lv_anim_exec_xcb_t)lv_preload_set_arc_length;
             b.path_cb        = lv_anim_path_ease_in_out;
             b.ready_cb       = NULL;
             b.act_time       = 0;
@@ -233,7 +233,7 @@ void lv_preload_set_anim_type(lv_obj_t * preload, lv_preload_type_t type)
                 a.start = 0;
                 a.end   = 360;
             }
-            a.exec_cb        = (lv_anim_exec_cb_t)lv_preload_spinner_anim;
+            a.exec_cb        = (lv_anim_exec_xcb_t)lv_preload_spinner_anim;
             a.path_cb        = lv_anim_path_ease_in_out;
             a.ready_cb       = NULL;
             a.act_time       = 0;
diff --git a/src/lv_objx/lv_roller.c b/src/lv_objx/lv_roller.c
index a2377ef68..a144a1a28 100644
--- a/src/lv_objx/lv_roller.c
+++ b/src/lv_objx/lv_roller.c
@@ -408,7 +408,7 @@ static lv_res_t lv_roller_signal(lv_obj_t * roller, lv_signal_t sign, void * par
 
             refr_height(roller);
 #if LV_USE_ANIMATION
-            lv_anim_del(lv_page_get_scrl(roller), (lv_anim_exec_cb_t)lv_obj_set_y);
+            lv_anim_del(lv_page_get_scrl(roller), (lv_anim_exec_xcb_t)lv_obj_set_y);
 #endif
             lv_ddlist_set_selected(roller, ext->ddlist.sel_opt_id);
             refr_position(roller, false);
@@ -529,7 +529,7 @@ static lv_res_t lv_roller_scrl_signal(lv_obj_t * roller_scrl, lv_signal_t sign,
         }
     } else if(sign == LV_SIGNAL_PRESSED) {
 #if LV_USE_ANIMATION
-        lv_anim_del(roller_scrl, (lv_anim_exec_cb_t)lv_obj_set_y);
+        lv_anim_del(roller_scrl, (lv_anim_exec_xcb_t)lv_obj_set_y);
 #endif
     }
 
@@ -629,7 +629,7 @@ static void refr_position(lv_obj_t * roller, lv_anim_enable_t anim)
         a.var            = roller_scrl;
         a.start          = lv_obj_get_y(roller_scrl);
         a.end            = new_y;
-        a.exec_cb        = (lv_anim_exec_cb_t)lv_obj_set_y;
+        a.exec_cb        = (lv_anim_exec_xcb_t)lv_obj_set_y;
         a.path_cb        = lv_anim_path_linear;
         a.ready_cb       = scroll_anim_ready_cb;
         a.act_time       = 0;
@@ -662,7 +662,7 @@ static void refr_height(lv_obj_t * roller)
     lv_obj_set_height(lv_page_get_scrl(roller), lv_obj_get_height(ext->ddlist.label) + lv_obj_get_height(roller));
     lv_obj_align(ext->ddlist.label, NULL, obj_align, 0, 0);
 #if LV_USE_ANIMATION
-    lv_anim_del(lv_page_get_scrl(roller), (lv_anim_exec_cb_t)lv_obj_set_y);
+    lv_anim_del(lv_page_get_scrl(roller), (lv_anim_exec_xcb_t)lv_obj_set_y);
 #endif
     lv_ddlist_set_selected(roller, ext->ddlist.sel_opt_id);
 }
diff --git a/src/lv_objx/lv_ta.c b/src/lv_objx/lv_ta.c
index 7f6f112df..d529c9420 100644
--- a/src/lv_objx/lv_ta.c
+++ b/src/lv_objx/lv_ta.c
@@ -172,7 +172,7 @@ lv_obj_t * lv_ta_create(lv_obj_t * par, const lv_obj_t * copy)
         /*Create a cursor blinker animation*/
         lv_anim_t a;
         a.var            = new_ta;
-        a.exec_cb        = (lv_anim_exec_cb_t)cursor_blink_anim;
+        a.exec_cb        = (lv_anim_exec_xcb_t)cursor_blink_anim;
         a.time           = ext->cursor.blink_time;
         a.act_time       = 0;
         a.ready_cb       = NULL;
@@ -256,7 +256,7 @@ void lv_ta_add_char(lv_obj_t * ta, uint32_t c)
         /*Auto hide characters*/
         lv_anim_t a;
         a.var            = ta;
-        a.exec_cb        = (lv_anim_exec_cb_t)pwd_char_hider_anim;
+        a.exec_cb        = (lv_anim_exec_xcb_t)pwd_char_hider_anim;
         a.time           = ext->pwd_show_time;
         a.act_time       = 0;
         a.ready_cb       = pwd_char_hider_anim_ready;
@@ -337,7 +337,7 @@ void lv_ta_add_text(lv_obj_t * ta, const char * txt)
         /*Auto hide characters*/
         lv_anim_t a;
         a.var            = ta;
-        a.exec_cb        = (lv_anim_exec_cb_t)pwd_char_hider_anim;
+        a.exec_cb        = (lv_anim_exec_xcb_t)pwd_char_hider_anim;
         a.time           = ext->pwd_show_time;
         a.act_time       = 0;
         a.ready_cb       = pwd_char_hider_anim_ready;
@@ -477,7 +477,7 @@ void lv_ta_set_text(lv_obj_t * ta, const char * txt)
         /*Auto hide characters*/
         lv_anim_t a;
         a.var            = ta;
-        a.exec_cb        = (lv_anim_exec_cb_t)pwd_char_hider_anim;
+        a.exec_cb        = (lv_anim_exec_xcb_t)pwd_char_hider_anim;
         a.time           = ext->pwd_show_time;
         a.act_time       = 0;
         a.ready_cb       = pwd_char_hider_anim_ready;
@@ -584,7 +584,7 @@ void lv_ta_set_cursor_pos(lv_obj_t * ta, int16_t pos)
         /*Reset cursor blink animation*/
         lv_anim_t a;
         a.var            = ta;
-        a.exec_cb        = (lv_anim_exec_cb_t)cursor_blink_anim;
+        a.exec_cb        = (lv_anim_exec_xcb_t)cursor_blink_anim;
         a.time           = ext->cursor.blink_time;
         a.act_time       = 0;
         a.ready_cb       = NULL;
@@ -849,7 +849,7 @@ void lv_ta_set_cursor_blink_time(lv_obj_t * ta, uint16_t time)
         /*Reset cursor blink animation*/
         lv_anim_t a;
         a.var            = ta;
-        a.exec_cb        = (lv_anim_exec_cb_t)cursor_blink_anim;
+        a.exec_cb        = (lv_anim_exec_xcb_t)cursor_blink_anim;
         a.time           = ext->cursor.blink_time;
         a.act_time       = 0;
         a.ready_cb       = NULL;
diff --git a/src/lv_objx/lv_tabview.c b/src/lv_objx/lv_tabview.c
index 81cc8d004..7653e1dfd 100644
--- a/src/lv_objx/lv_tabview.c
+++ b/src/lv_objx/lv_tabview.c
@@ -371,7 +371,7 @@ void lv_tabview_set_tab_act(lv_obj_t * tabview, uint16_t id, lv_anim_enable_t an
         a.var            = ext->content;
         a.start          = lv_obj_get_x(ext->content);
         a.end            = cont_x;
-        a.exec_cb        = (lv_anim_exec_cb_t)lv_obj_set_x;
+        a.exec_cb        = (lv_anim_exec_xcb_t)lv_obj_set_x;
         a.path_cb        = lv_anim_path_linear;
         a.ready_cb       = NULL;
         a.act_time       = 0;
@@ -419,13 +419,13 @@ void lv_tabview_set_tab_act(lv_obj_t * tabview, uint16_t id, lv_anim_enable_t an
             case LV_TABVIEW_BTNS_POS_BOTTOM:
                 a.start   = lv_obj_get_x(ext->indic);
                 a.end     = indic_pos;
-                a.exec_cb = (lv_anim_exec_cb_t)lv_obj_set_x;
+                a.exec_cb = (lv_anim_exec_xcb_t)lv_obj_set_x;
                 break;
             case LV_TABVIEW_BTNS_POS_LEFT:
             case LV_TABVIEW_BTNS_POS_RIGHT:
                 a.start   = lv_obj_get_y(ext->indic);
                 a.end     = indic_pos;
-                a.exec_cb = (lv_anim_exec_cb_t)lv_obj_set_y;
+                a.exec_cb = (lv_anim_exec_xcb_t)lv_obj_set_y;
                 break;
         }
 
diff --git a/src/lv_objx/lv_tileview.c b/src/lv_objx/lv_tileview.c
index e091493d0..8b35f0a78 100644
--- a/src/lv_objx/lv_tileview.c
+++ b/src/lv_objx/lv_tileview.c
@@ -214,7 +214,7 @@ void lv_tileview_set_tile_act(lv_obj_t * tileview, lv_coord_t x, lv_coord_t y, l
 
         lv_anim_t a;
         a.var            = scrl;
-        a.exec_cb        = (lv_anim_exec_cb_t)lv_obj_set_x;
+        a.exec_cb        = (lv_anim_exec_xcb_t)lv_obj_set_x;
         a.path_cb        = lv_anim_path_linear;
         a.ready_cb       = NULL;
         a.act_time       = 0;
@@ -233,7 +233,7 @@ void lv_tileview_set_tile_act(lv_obj_t * tileview, lv_coord_t x, lv_coord_t y, l
         if(y_coord != y_act) {
             a.start   = y_act;
             a.end     = y_coord;
-            a.exec_cb = (lv_anim_exec_cb_t)lv_obj_set_y;
+            a.exec_cb = (lv_anim_exec_xcb_t)lv_obj_set_y;
             lv_anim_create(&a);
         }
 #endif
diff --git a/src/lv_themes/lv_theme.h b/src/lv_themes/lv_theme.h
index 2ce92d0d8..7c0c66697 100644
--- a/src/lv_themes/lv_theme.h
+++ b/src/lv_themes/lv_theme.h
@@ -328,8 +328,10 @@ typedef struct
 #if LV_USE_GROUP
     struct
     {
-        lv_group_style_mod_cb_t style_mod_cb;
-        lv_group_style_mod_cb_t style_mod_edit_cb;
+        /* The `x` in the names inidicates that inconsistence becasue
+         * the group related function are stored in the theme.*/
+        lv_group_style_mod_cb_t style_mod_xcb;
+        lv_group_style_mod_cb_t style_mod_edit_xcb;
     } group;
 #endif
 } lv_theme_t;
diff --git a/src/lv_themes/lv_theme_alien.c b/src/lv_themes/lv_theme_alien.c
index 43747038f..28c1b29a5 100644
--- a/src/lv_themes/lv_theme_alien.c
+++ b/src/lv_themes/lv_theme_alien.c
@@ -928,8 +928,8 @@ lv_theme_t * lv_theme_alien_init(uint16_t hue, lv_font_t * font)
     win_init();
 
 #if LV_USE_GROUP
-    theme.group.style_mod_cb      = style_mod;
-    theme.group.style_mod_edit_cb = style_mod_edit;
+    theme.group.style_mod_xcb      = style_mod;
+    theme.group.style_mod_edit_xcb = style_mod_edit;
 #endif
 
     return &theme;
diff --git a/src/lv_themes/lv_theme_default.c b/src/lv_themes/lv_theme_default.c
index 0d33fdb0d..36b7665ef 100644
--- a/src/lv_themes/lv_theme_default.c
+++ b/src/lv_themes/lv_theme_default.c
@@ -448,8 +448,8 @@ lv_theme_t * lv_theme_default_init(uint16_t hue, lv_font_t * font)
     win_init();
 
 #if LV_USE_GROUP
-    theme.group.style_mod_cb      = style_mod;
-    theme.group.style_mod_edit_cb = style_mod_edit;
+    theme.group.style_mod_xcb      = style_mod;
+    theme.group.style_mod_edit_xcb = style_mod_edit;
 #endif
 
     return &theme;
diff --git a/src/lv_themes/lv_theme_material.c b/src/lv_themes/lv_theme_material.c
index 2437de779..e2c12fe1e 100644
--- a/src/lv_themes/lv_theme_material.c
+++ b/src/lv_themes/lv_theme_material.c
@@ -902,8 +902,8 @@ lv_theme_t * lv_theme_material_init(uint16_t hue, lv_font_t * font)
     win_init();
 
 #if LV_USE_GROUP
-    theme.group.style_mod_cb      = style_mod;
-    theme.group.style_mod_edit_cb = style_mod_edit;
+    theme.group.style_mod_xcb      = style_mod;
+    theme.group.style_mod_edit_xcb = style_mod_edit;
 #endif
 
     return &theme;
diff --git a/src/lv_themes/lv_theme_mono.c b/src/lv_themes/lv_theme_mono.c
index f6b0c2a73..3b58c92c2 100644
--- a/src/lv_themes/lv_theme_mono.c
+++ b/src/lv_themes/lv_theme_mono.c
@@ -495,8 +495,8 @@ lv_theme_t * lv_theme_mono_init(uint16_t hue, lv_font_t * font)
     win_init();
 
 #if LV_USE_GROUP
-    theme.group.style_mod_cb      = style_mod;
-    theme.group.style_mod_edit_cb = style_mod_edit;
+    theme.group.style_mod_xcb      = style_mod;
+    theme.group.style_mod_edit_xcb = style_mod_edit;
 #endif
 
     return &theme;
diff --git a/src/lv_themes/lv_theme_nemo.c b/src/lv_themes/lv_theme_nemo.c
index 2fd2df939..e30b0e6a4 100644
--- a/src/lv_themes/lv_theme_nemo.c
+++ b/src/lv_themes/lv_theme_nemo.c
@@ -900,8 +900,8 @@ lv_theme_t * lv_theme_nemo_init(uint16_t hue, lv_font_t * font)
     win_init();
 
 #if LV_USE_GROUP
-    theme.group.style_mod_cb      = style_mod;
-    theme.group.style_mod_edit_cb = style_mod_edit;
+    theme.group.style_mod_xcb      = style_mod;
+    theme.group.style_mod_edit_xcb = style_mod_edit;
 #endif
 
     return &theme;
diff --git a/src/lv_themes/lv_theme_night.c b/src/lv_themes/lv_theme_night.c
index 79a17f645..73aaf39b0 100644
--- a/src/lv_themes/lv_theme_night.c
+++ b/src/lv_themes/lv_theme_night.c
@@ -816,8 +816,8 @@ lv_theme_t * lv_theme_night_init(uint16_t hue, lv_font_t * font)
     win_init();
 
 #if LV_USE_GROUP
-    theme.group.style_mod_cb      = style_mod;
-    theme.group.style_mod_edit_cb = style_mod_edit;
+    theme.group.style_mod_xcb      = style_mod;
+    theme.group.style_mod_edit_xcb = style_mod_edit;
 #endif
 
     return &theme;
diff --git a/src/lv_themes/lv_theme_templ.c b/src/lv_themes/lv_theme_templ.c
index 8479f202a..6dd4eef7e 100644
--- a/src/lv_themes/lv_theme_templ.c
+++ b/src/lv_themes/lv_theme_templ.c
@@ -450,8 +450,8 @@ lv_theme_t * lv_theme_templ_init(uint16_t hue, lv_font_t * font)
     win_init();
 
 #if LV_USE_GROUP
-    theme.group.style_mod_cb      = style_mod;
-    theme.group.style_mod_edit_cb = style_mod_edit;
+    theme.group.style_mod_xcb      = style_mod;
+    theme.group.style_mod_edit_xcb = style_mod_edit;
 #endif
 
     return &theme;
diff --git a/src/lv_themes/lv_theme_zen.c b/src/lv_themes/lv_theme_zen.c
index 5d02c2260..a87f63fdf 100644
--- a/src/lv_themes/lv_theme_zen.c
+++ b/src/lv_themes/lv_theme_zen.c
@@ -872,8 +872,8 @@ lv_theme_t * lv_theme_zen_init(uint16_t hue, lv_font_t * font)
     win_init();
 
 #if LV_USE_GROUP
-    theme.group.style_mod_cb      = style_mod;
-    theme.group.style_mod_edit_cb = style_mod_edit;
+    theme.group.style_mod_xcb      = style_mod;
+    theme.group.style_mod_edit_xcb = style_mod_edit;
 #endif
 
     return &theme;