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Fixed bug 3158 - SDL display window scrambled over VNC

Witek Jachimczyk

I'm using SDL to develop a video viewer for MATLAB.  The window is scrambled while using thightVNC with its default mode of RGB656.

SDL does not correctly recognize the pixel mode.


I found a solution for this problem.  The solution involves modifying
SDL/src/video/SDL_pixels.c

Adding the following "if statement" under case 16: of SDL_MasksToPixelFormatEnum resolves the issue:

        if (Rmask == 0x003F &&
            Gmask == 0x07C0 &&
            Bmask == 0xF800 &&
            Amask == 0x0000) {
            return SDL_PIXELFORMAT_RGB565;
        }

I hope that this helps someone.  I took me a while to figure it out.
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slouken committed Aug 12, 2017
1 parent 4a9c6f0 commit e3f3a757f30adc9ea14422e7322dfee1a09a1abb
Showing with 7 additions and 0 deletions.
  1. +7 −0 src/video/SDL_pixels.c
@@ -403,6 +403,13 @@ SDL_MasksToPixelFormatEnum(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask,
Amask == 0x0000) {
return SDL_PIXELFORMAT_BGR565;
}
if (Rmask == 0x003F &&
Gmask == 0x07C0 &&
Bmask == 0xF800 &&
Amask == 0x0000) {
/* Technically this would be BGR556, but Witek says this works in bug 3158 */
return SDL_PIXELFORMAT_RGB565;
}
break;
case 24:
switch (Rmask) {

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