Xorg crashes with enabled the composite extension when trying to use source only pictures. The two patches http://webcvs.freedesktop.org/xorg/xserver/xorg/render/picture.c?r1=1.28&r2=1.29 http://webcvs.freedesktop.org/xorg/xserver/xorg/miext/cw/cw.h?r1=1.14&r2=1.15 fix the crash. In addition http://webcvs.freedesktop.org/xorg/xserver/xorg/render/picture.c?r1=1.29&r2=1.30 fixes an error in the gradient test of rendercheck (where PictOpSource was sometimes used mistakenly instead of PictOpSourceOver).
applied to stable branch, thanks!
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