improved error tolerance of SDL native surface conversion

diff --git a/src/libgame/sdl.c b/src/libgame/sdl.c
index 2217842e8c8b132e7e17193360b7dcd236de158a..e7e985052cb7e9f7b8ebd88f4863620e1b939514 100644 (file)
--- a/src/libgame/sdl.c
+++ b/src/libgame/sdl.c
@@ -207,11 +207,13 @@ boolean SDLSetNativeSurface(SDL_Surface **surface)
 
 SDL_Surface *SDLGetNativeSurface(SDL_Surface *surface)
 {
-  if (surface == NULL ||
-      backbuffer == NULL ||
-      backbuffer->surface == NULL)
+  if (surface == NULL)
     return NULL;
 
+  if (backbuffer == NULL ||
+      backbuffer->surface == NULL)
+    return SDL_ConvertSurface(surface, surface->format, 0);
+
   return SDL_ConvertSurface(surface, backbuffer->surface->format, 0);
 }