Fixed bug 5304 - add SDL_HasSurfaceRLE() (Thanks Rene Dudfield and Dan Lawrence)

include/SDL_surface.h

@@ -237,6 +237,13 @@ extern DECLSPEC int SDLCALL SDL_SaveBMP_RW
 extern DECLSPEC int SDLCALL SDL_SetSurfaceRLE(SDL_Surface * surface,
                                               int flag);
 
+/**
+ *  \brief Returns whether the surface is RLE enabled
+ *
+ *  \return SDL_TRUE if the surface is RLE enabled, or SDL_FALSE if the surface is NULL or not RLE enabled
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_HasSurfaceRLE(SDL_Surface * surface);
+
 /**
  *  \brief Sets the color key (transparent pixel) in a blittable surface.
  *

src/dynapi/SDL_dynapi_overrides.h

@@ -767,3 +767,4 @@
 #define SDL_SIMDRealloc SDL_SIMDRealloc_REAL
 #define SDL_AndroidRequestPermission SDL_AndroidRequestPermission_REAL
 #define SDL_OpenURL SDL_OpenURL_REAL
+#define SDL_HasSurfaceRLE SDL_HasSurfaceRLE_REAL

src/dynapi/SDL_dynapi_procs.h

@@ -828,3 +828,4 @@ SDL_DYNAPI_PROC(void*,SDL_SIMDRealloc,(void *a, const size_t b),(a, b),return)
 SDL_DYNAPI_PROC(SDL_bool,SDL_AndroidRequestPermission,(const char *a),(a),return)
 #endif
 SDL_DYNAPI_PROC(int,SDL_OpenURL,(const char *a),(a),return)
+SDL_DYNAPI_PROC(SDL_bool,SDL_HasSurfaceRLE,(SDL_Surface *a),(a),return)

src/video/SDL_surface.c

@@ -249,6 +249,20 @@ SDL_SetSurfaceRLE(SDL_Surface * surface, int flag)
     return 0;
 }
 
+SDL_bool
+SDL_HasSurfaceRLE(SDL_Surface * surface)
+{
+    if (!surface) {
+        return SDL_FALSE;
+    }
+
+    if (!(surface->map->info.flags & SDL_COPY_RLE_DESIRED)) {
+        return SDL_FALSE;
+    }
+
+    return SDL_TRUE;
+}
+
 int
 SDL_SetColorKey(SDL_Surface * surface, int flag, Uint32 key)
 {