The source rectangle isn't modified in SDL_UpperBlit

include/SDL_surface.h

@@ -585,7 +585,7 @@ extern DECLSPEC int SDLCALL SDL_BlendFillRects
  *  rectangle validation and clipping before passing it to SDL_LowerBlit()
  */
 extern DECLSPEC int SDLCALL SDL_UpperBlit
-    (SDL_Surface * src, SDL_Rect * srcrect,
+    (SDL_Surface * src, const SDL_Rect * srcrect,
      SDL_Surface * dst, SDL_Rect * dstrect);
 
 /**

src/video/SDL_surface.c

@@ -640,7 +640,7 @@ SDL_LowerBlit(SDL_Surface * src, SDL_Rect * srcrect,
 
 
 int
-SDL_UpperBlit(SDL_Surface * src, SDL_Rect * srcrect,
+SDL_UpperBlit(SDL_Surface * src, const SDL_Rect * srcrect,
               SDL_Surface * dst, SDL_Rect * dstrect)
 {
     SDL_Rect fulldst;