[cairo] Glitz backend: Tesselation bug

[Stefan Krause]

The attached source code shows a bug in the glitz backend (at least I 
think it's a bug). Rendering is OK for cairo with X11 backend. The bug 
is that the rounded rectangle (code from cairo-demo) drawn with alpha 
may show artefacts for certain angles of rotation. A reason might be 
that a triangle of the tessellated shape is drawn twice causing the 
darker triangle in the shape. The source code shows a dark red triangle 
in the upper right part and a lighter (correct) drawn shape in other 
part of the screen.
Glitz and cairo are current cvs builds. The system is a SuSE 9.2 with 
6629 NVidia drivers. To compile the source please use:
g++ -c `pkg-config --cflags glitz glitz-glx cairo` -L/usr/X11R6/lib/ 
glitzBug.cpp
g++ -o glitzBug glitzBug.o `pkg-config --libs cairo glitz glitz-glx` 
-L/usr/X11R6/lib/ -lXext -lX11 -lm

Yours,
Stefan
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