Add more pixelformat compat symbols

Co-Authored-By: Ankith <itsankith26@gmail.com>

Author: Starbuck5

src_c/_pygame.h

@@ -108,6 +108,33 @@ PG_UnlockMutex(SDL_mutex *mutex)
 #define PG_FORMAT_BytesPerPixel(format) format->bytes_per_pixel
 #define PG_SURF_FORMATENUM(surf) surf->format
 
+#define PG_FORMAT_R_LOSS(format) (8 - format->Rbits)
+#define PG_FORMAT_G_LOSS(format) (8 - format->Gbits)
+#define PG_FORMAT_B_LOSS(format) (8 - format->Bbits)
+#define PG_FORMAT_A_LOSS(format) (8 - format->Abits)
+
+#define PG_PixelFormat const SDL_PixelFormatDetails
+
+static inline bool
+PG_GetSurfaceDetails(SDL_Surface *surf, PG_PixelFormat **format_p,
+                     SDL_Palette **palette_p)
+{
+    *palette_p = SDL_GetSurfacePalette(surf);
+    *format_p = SDL_GetPixelFormatDetails(surf->format);
+    return *format_p != NULL;
+}
+
+static inline PG_PixelFormat *
+PG_GetSurfaceFormat(SDL_Surface *surf)
+{
+    return SDL_GetPixelFormatDetails(surf->format);
+}
+
+#define PG_GetRGBA SDL_GetRGBA
+#define PG_GetRGB SDL_GetRGB
+#define PG_MapRGBA SDL_MapRGBA
+#define PG_MapRGB SDL_MapRGB
+
 /* Mask to test if surface flags are in a fullscreen window. */
 #define PG_WINDOW_FULLSCREEN_INCLUSIVE SDL_WINDOW_FULLSCREEN
 
@@ -176,6 +203,61 @@ PG_UnlockMutex(SDL_mutex *mutex)
 #define PG_FORMAT_BytesPerPixel(format) format->BytesPerPixel
 #define PG_SURF_FORMATENUM(surf) surf->format->format
 
+#define PG_FORMAT_R_LOSS(format) format->Rloss
+#define PG_FORMAT_G_LOSS(format) format->Gloss
+#define PG_FORMAT_B_LOSS(format) format->Bloss
+#define PG_FORMAT_A_LOSS(format) format->Aloss
+
+#define PG_PixelFormat SDL_PixelFormat
+
+static inline bool
+PG_GetSurfaceDetails(SDL_Surface *surf, PG_PixelFormat **format_p,
+                     SDL_Palette **palette_p)
+{
+    *format_p = surf->format;
+    *palette_p = surf->format->palette;
+    return true;
+}
+
+static inline PG_PixelFormat *
+PG_GetSurfaceFormat(SDL_Surface *surf)
+{
+    return surf->format;
+}
+
+// NOTE:
+// palette is part of the format in SDL2, so these functions below have it
+// as a separate parameter to be consistent with the SDL3 signature.
+// They are ignoring the palette parameter, but not the palette data.
+
+static inline void
+PG_GetRGBA(Uint32 pixel, PG_PixelFormat *format, const SDL_Palette *palette,
+           Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a)
+{
+    SDL_GetRGBA(pixel, format, r, g, b, a);
+}
+
+static inline void
+PG_GetRGB(Uint32 pixel, PG_PixelFormat *format, const SDL_Palette *palette,
+          Uint8 *r, Uint8 *g, Uint8 *b)
+{
+    SDL_GetRGB(pixel, format, r, g, b);
+}
+
+static inline Uint32
+PG_MapRGBA(PG_PixelFormat *format, const SDL_Palette *palette, Uint8 r,
+           Uint8 g, Uint8 b, Uint8 a)
+{
+    return SDL_MapRGBA(format, r, g, b, a);
+}
+
+static inline Uint32
+PG_MapRGB(PG_PixelFormat *format, const SDL_Palette *palette, Uint8 r, Uint8 g,
+          Uint8 b)
+{
+    return SDL_MapRGB(format, r, g, b);
+}
+
 /* Mask to test if surface flags are in a fullscreen window.
  * SDL_WINDOW_FULLSCREEN_DESKTOP works here because it also contains
  * SDL_WINDOW_FULLSCREEN. */