[SDL] Problem with SDL YUVOverlay

[Carsten]

When we call SDL_DisplayYUVOverlay(...) the overlay is blitted to the screen,
but we first want to draw other graphic stuff to the display before blitting.

Example (pseudo code):

SDL_Surface display = SDL_GetVideoSurface();

SDL_Overlay ov = SDL_CreateYUVOverlay(100, 100, 2, display);

SDL_DisplayYUVOverlay(ov,...);  //At this point the overlay is displayed to the
monitor!!! But we don't want it!!!

//lots of stuff

SDL_DrawPixel(display,10,10,RED); //draw a pixel

SDL_Flip();   //show all


At SDL_Flip the programm should show the YUV_Overlay and the drawed pixel in one
step and not show the Overlay in advance.

Thx!