Matrox g400 patch for hw blends / compositions

[Damien Ciabrini]

Hello all,

I've made a patch for the matrox g400 (newer cards should also work) to do 
blending and compositing in hardware. The patch doesn't work on g200 nor g100 
due to the lack of multitextures on these cards.

The patch does access hardware in MMIO, it doesn't use DRI/DRM yet. It seems 
to work pretty well on aewm, fvwm2 or openbox :) (16bpps). It also corrects a 
bug in the old driver for solid fills in 16bpps.

The patch fits cleanly into CVS. I'm new to the mailling list, so I don't know 
if this is the right list to post it (maybe xserver-commit would have been 
better ?). Can someone review it and send me feedback ?

Thanks in advance :)

--
Damien
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