perf(sdl): optimize the use of SDL_RenderSetClipRect (#2941)

* reduce SDL_RenderSetClipRect as much as possible

* added some comments

* removing draw_sw usage

* fixed import

* implemented polygon drawing

* supports subimage for sdl texture based images

* fixed formatting

* removed unused code

* cleanup

* cleanup

* formatted code

src/draw/sdl/lv_draw_sdl.h

@@ -20,7 +20,8 @@ extern "C" {
 
 #include LV_GPU_SDL_INCLUDE_PATH
 
-#include "../sw/lv_draw_sw.h"
+#include "../lv_draw.h"
+#include "../../core/lv_disp.h"
 
 /*********************
  *      DEFINES
@@ -46,7 +47,7 @@ typedef struct {
 } lv_draw_sdl_drv_param_t;
 
 typedef struct {
-    lv_draw_sw_ctx_t base_draw;
+    lv_draw_ctx_t base_draw;
     SDL_Renderer * renderer;
     struct lv_draw_sdl_context_internals_t * internals;
 } lv_draw_sdl_ctx_t;