I had to restrict the usage of the new image drawing mechanism for the
cairo backend to the cases where the clipping region is representable as
a list of rectangles. With the new drawing code we store and restore the
GState and this only works correctly when the clipping region is
composed of rectangles.
The problem became obvious in the JigSaw Application which is now part
of GAP and which does use non-rectangular shapes for its pieces. These
pieces where drawn incorrectly with the new drawing mechanism but
correctly with the old one.
I would love to see a better solution for this, so feel free to suggest one.
Cheers
Fred
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