Premultiplied alpha handle for driver
Huang, FrankR
FrankR.Huang at amd.com
Sun May 30 19:42:06 PDT 2010
Hi all,
A question to ask.
We know the premultiplied alpha will be used sometimes in
blend. Is that used in the graphics driver?
Take an example:
If we use a XRenderComposite() function to do
the rendering:
XRenderComposite(dyp, PictOpOver,
picture_1x1[0].pict, mask_20x20[0].pict, win->pict, 0, 0, 0, 0, 50, 50,
40, 40);
And the picture_1x1[0] is a ARGB
picture with an alpha value; mask_20x20[0] is a A8 picture with an alpha
value.
How the driver(do_composite) handle this two
alpha value?
Thanks,
Frank
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