A few fixes:

Fixed creating render texture framebuffer.
Removed the need for palette watch, added surface format caching.
Added an SDL_DONTFREE flag so you can't free the window and 1.2 shadow surfaces.

include/SDL_surface.h

@@ -54,6 +54,7 @@ extern "C" {
 /*@{*/
 #define SDL_PREALLOC        0x00000001  /**< Surface uses preallocated memory */
 #define SDL_RLEACCEL        0x00000002  /**< Surface is RLE encoded */
+#define SDL_DONTFREE        0x00000004  /**< Surface is referenced internally */
 /*@}*//*Surface flags*/
 
 /**