Change default pixel format on little endian to ARGB.

Not touching big endian as this would require further testing.

Has the same base performance as ABGR so is okay to use.

Makes Masked Blit much faster (see #3497), Pixman fast path probably?
Also is the format used by Maniacs so the pixel operations are faster

Author: Ghabry

src/platform/sdl/sdl2_ui.cpp

@@ -63,7 +63,7 @@ static uint32_t GetDefaultFormat() {
 #ifdef WORDS_BIGENDIAN
 	return SDL_PIXELFORMAT_ABGR32;
 #else
-	return SDL_PIXELFORMAT_RGBA32;
+	return SDL_PIXELFORMAT_BGRA32;
 #endif
 }
 
@@ -88,7 +88,7 @@ static int GetFormatRank(uint32_t fmt) {
 		case SDL_PIXELFORMAT_RGBA32:
 			return 2;
 		case SDL_PIXELFORMAT_BGRA32:
-			return 2;
+			return 3;
 		case SDL_PIXELFORMAT_ARGB32:
 			return 1;
 		case SDL_PIXELFORMAT_ABGR32:

src/platform/sdl/sdl3_ui.cpp

@@ -65,7 +65,7 @@ static SDL_PixelFormat GetDefaultFormat() {
 #ifdef WORDS_BIGENDIAN
 	return SDL_PIXELFORMAT_ABGR32;
 #else
-	return SDL_PIXELFORMAT_RGBA32;
+	return SDL_PIXELFORMAT_BGRA32;
 #endif
 }