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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.