Alexander Larsson 9d2e9eb190 Clear alpha in xRGB destination to avoid pixman setting it to 0xff ... Pixman sometimes sets the ignored high byte to 0xff during alpha blending. This is correct according to pixman specs, as the high byte is ignored. However its not what windows expects, and it causes unnecessary regions with non-zero high byte, causing us to send rgba data instead of rgb which compresses worse. So, we detect this and clear the high byte.		2012-03-20 15:25:42 +01:00
common	Clear alpha in xRGB destination to avoid pixman setting it to 0xff	2012-03-20 15:25:42 +01:00