X-Git-Url: https://git.artsoft.org/?a=blobdiff_plain;f=src%2Flibgame%2Fsdl.c;h=e005eb0ef829b69d85053b2da460c440c3499b76;hb=e8521f03e3e2e3952137086b6aaee3a572b01aa1;hp=a66049e97e0175cf9fef962ff2518d0d7a658ee2;hpb=7bcc6aa833d64b21f78793dd00ed4c1356b98d05;p=rocksndiamonds.git

diff --git a/src/libgame/sdl.c b/src/libgame/sdl.c
index a66049e9..e005eb0e 100644
--- a/src/libgame/sdl.c
+++ b/src/libgame/sdl.c
@@ -297,19 +297,35 @@ static boolean equalSDLPixelFormat(SDL_PixelFormat *format1,
 	  format1->Bmask	 == format2->Bmask);
 }
 
-static Pixel SDLGetColorKey(SDL_Surface *surface)
+static void SDLCopyColorKey(SDL_Surface *src_surface, SDL_Surface *dst_surface)
 {
   Pixel color_key;
+  Uint8 r, g, b;
 
-  if (SDL_GetColorKey(surface, &color_key) != 0)
-    return -1;
+  // check if source surface has a color key
+  if (SDL_GetColorKey(src_surface, &color_key) == 0)
+  {
+    // get RGB values of color key of source surface
+    SDL_GetRGB(color_key, src_surface->format, &r, &g, &b);
+
+    // get color key from RGB values in destination surface format
+    color_key = SDL_MapRGB(dst_surface->format, r, g, b);
 
-  return color_key;
+    // set color key in destination surface
+    SDL_SetColorKey(dst_surface, SET_TRANSPARENT_PIXEL, color_key);
+  }
+  else
+  {
+    // unset color key in destination surface
+    SDL_SetColorKey(dst_surface, UNSET_TRANSPARENT_PIXEL, 0);
+  }
 }
 
 static boolean SDLHasColorKey(SDL_Surface *surface)
 {
-  return (SDLGetColorKey(surface) != -1);
+  Pixel color_key;
+
+  return (SDL_GetColorKey(surface, &color_key) == 0);
 }
 
 static boolean SDLHasAlpha(SDL_Surface *surface)
@@ -364,8 +380,7 @@ SDL_Surface *SDLGetNativeSurface(SDL_Surface *surface)
 
   // workaround for a bug in SDL 2.0.12 (which does not convert the color key)
   if (SDLHasColorKey(surface) && !SDLHasColorKey(new_surface))
-    SDL_SetColorKey(new_surface, SET_TRANSPARENT_PIXEL,
-		    SDLGetColorKey(surface));
+    SDLCopyColorKey(surface, new_surface);
 
   return new_surface;
 }
@@ -2267,8 +2282,7 @@ Bitmap *SDLZoomBitmap(Bitmap *src_bitmap, int dst_width, int dst_height)
 
   // set color key for zoomed surface from source surface, if defined
   if (SDLHasColorKey(src_surface))
-    SDL_SetColorKey(dst_surface, SET_TRANSPARENT_PIXEL,
-		    SDLGetColorKey(src_surface));
+    SDLCopyColorKey(src_surface, dst_surface);
 
   // create native non-transparent surface for opaque blitting
   dst_bitmap->surface = SDLGetOpaqueSurface(dst_surface);