lv_canvas: disable anti alaising when drawing with transparent color …

…to chroma keyed canvas

src/lv_objx/lv_canvas.c

@@ -482,6 +482,15 @@ void lv_canvas_draw_rect(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord
     disp.driver.hor_res = dsc->header.w;
     disp.driver.ver_res = dsc->header.h;
 
+    /*Disable anti-aliasing if drawing with transparent color to chroma keyed canvas*/
+    lv_color_t ctransp = LV_COLOR_TRANSP;
+    if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED &&
+        style->body.main_color.full == ctransp.full &&
+        style->body.grad_color.full == ctransp.full)
+    {
+        disp.driver.antialiasing = 0;
+    }
+
     lv_disp_t * refr_ori = lv_refr_get_disp_refreshing();
     lv_refr_set_disp_refreshing(&disp);
 
@@ -633,6 +642,15 @@ void lv_canvas_draw_line(lv_obj_t * canvas, const lv_point_t * points, uint32_t
     disp.driver.hor_res = dsc->header.w;
     disp.driver.ver_res = dsc->header.h;
 
+    /*Disable anti-aliasing if drawing with transparent color to chroma keyed canvas*/
+    lv_color_t ctransp = LV_COLOR_TRANSP;
+    if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED &&
+        style->body.main_color.full == ctransp.full &&
+        style->body.grad_color.full == ctransp.full)
+    {
+        disp.driver.antialiasing = 0;
+    }
+
     lv_disp_t * refr_ori = lv_refr_get_disp_refreshing();
     lv_refr_set_disp_refreshing(&disp);
 
@@ -676,6 +694,15 @@ void lv_canvas_draw_polygon(lv_obj_t * canvas, const lv_point_t * points, uint32
     disp.driver.hor_res = dsc->header.w;
     disp.driver.ver_res = dsc->header.h;
 
+    /*Disable anti-aliasing if drawing with transparent color to chroma keyed canvas*/
+    lv_color_t ctransp = LV_COLOR_TRANSP;
+    if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED &&
+        style->body.main_color.full == ctransp.full &&
+        style->body.grad_color.full == ctransp.full)
+    {
+        disp.driver.antialiasing = 0;
+    }
+
     lv_disp_t * refr_ori = lv_refr_get_disp_refreshing();
     lv_refr_set_disp_refreshing(&disp);
 
@@ -720,6 +747,15 @@ void lv_canvas_draw_arc(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord_
     disp.driver.hor_res = dsc->header.w;
     disp.driver.ver_res = dsc->header.h;
 
+    /*Disable anti-aliasing if drawing with transparent color to chroma keyed canvas*/
+    lv_color_t ctransp = LV_COLOR_TRANSP;
+    if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED &&
+        style->body.main_color.full == ctransp.full &&
+        style->body.grad_color.full == ctransp.full)
+    {
+        disp.driver.antialiasing = 0;
+    }
+
     lv_disp_t * refr_ori = lv_refr_get_disp_refreshing();
     lv_refr_set_disp_refreshing(&disp);