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Write a dedicated compositor for pixman so that we avoid the
middle-layer syndrome of surface-fallback. The major upshot of this
rewrite is that the image surface is now several times quicker for glyph
compositing, which dramatically improves performance for text rendering
by firefox and friends. It also uses a couple of the new scan
convertors, such as the rectangular scan converter for rectilinear
paths.
Speedups
========
image-rgba firefox-talos-gfx-0 342050.17 (342155.88 0.02%) -> 69412.44 (69702.90 0.21%): 4.93x speedup
███▉
image-rgba vim-0 97518.13 (97696.23 1.21%) -> 30712.63 (31238.65 0.85%): 3.18x speedup
██▏
image-rgba evolution-0 69927.77 (110261.08 19.84%) -> 24430.05 (25368.85 1.89%): 2.86x speedup
█▉
image-rgba poppler-0 41452.61 (41547.03 2.51%) -> 21195.52 (21656.85 1.08%): 1.96x speedup
█
image-rgba firefox-planet-gnome-0 217512.61 (217636.80 0.06%) -> 123341.02 (123641.94 0.12%): 1.76x speedup
▊
image-rgba swfdec-youtube-0 41302.71 (41373.60 0.11%) -> 31343.93 (31488.87 0.23%): 1.32x speedup
▍
image-rgba swfdec-giant-steps-0 20699.54 (20739.52 0.10%) -> 17360.19 (17375.51 0.04%): 1.19x speedup
▎
image-rgba gvim-0 167837.47 (168027.68 0.51%) -> 151105.94 (151635.85 0.18%): 1.11x speedup
▏
image-rgba firefox-talos-svg-0 375273.43 (388250.94 1.60%) -> 356846.09 (370370.08 1.86%): 1.05x speedup
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![[test] Add unbounded variants of clip-{fill,stroke}](/~igor.oliveira/cairo-drm-gallium/commit/test/clip-fill-unbounded.argb32.ref.png?id=634fdb4afd15e2467979609b1af7c1c198fc83d4){kind=link}