Robert Bragg a9b011f3ed [premultiplication] Be more conservative with what data gets premultiplied
We don't want to force texture data to be premultipled if the user
explicitly specifies a non premultiplied internal_format such as
COGL_PIXEL_FORMAT_RGBA_8888.  So now Cogl will only automatically
premultiply data when COGL_PIXEL_FORMAT_ANY is given for the
internal_format, or a premultiplied internal format such as
COGL_PIXEL_FORMAT_RGBA_8888_PRE is requested but non-premultiplied source
data is given.

This approach is consistent with OpenVG image formats which have already
influenced Cogl's pixel format semantics.
2009-06-11 14:17:53 +01:00
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