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A visual describes how colors are laid out by the X11 server. So far, softbuffer did not do anything with visuals and just passed them around. This commit adds checks that should ensure that a given visual actually lays out pixels in the only format supported by softbuffer: - 32 bit per pixel - 00RRGGBB byte order In this patch, I also try to handle big endian systems and mixed endian situations where we are e.g. running on a big endian system and talking to a little endian X11 server. However, this is all theoretical and completely untested. I only tested my X11 server's default visual works and some ARGB visual is rejected. Fixes: #184 Signed-off-by: Uli Schlachter <[email protected]>
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