fourcc: allow fallback to RGBA

XRGB was the default 32-bit RGB chroma with a mask. In some cases RGBA might be be supported, but it can't be handled locally from a XRGB source.

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I won't open a thread because it's not a bug in this MR but I'm not sure if this is really safe. There may be some modules not behaving well in the face of RGBA?

IMO this whole RGB fallback should go away, it doesn't even support higher bit depth and assumes RGB is 4:4:4. Given how much time is used on testing a lot of modules for each fallback, it wouldn't hurt much to generate it on the fly.

That being said, RGBA is probably the safest/most common format supported by GPU modules (with BGRA). For the rest XRGB is the next best.

Also I added this for OpenGL, but there's a shortcut to RGBA there. I'm not sure if much modules will gain any advantage from this.

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• 7e28547f - fourcc: allow fallback to RGBA

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