Robin Gareus
0b266a54f0
Return of image-surface backed canvas (windows graphics performance)
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This partially reverts 2edbda2526 .
Using cairo-groups increases performance on MacOS, and retains
retina-resolution.
However it adds a performance regression for MS Windows graphics
rendering. cairo-groups use a "similar" surface, not an image surface.
Empirically this adds significant overhead compared to rendering
using the CPU and using bitblt.
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