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This speeds up the mask generation step in cairo_fill() for the image
surface by up to 10x in especially favourable cases.
image-rgba twin-800 7757.80 0.20% -> 749.41 0.29%: 10.36x speedup
image-rgba spiral-diag-pixalign-nonzero-fill-512 15.16 0.44% -> 3.45 8.80%: 5.54x speedup
More typical simple non-rectilinear geometries are sped up by 30-50%.
This patch does not affect any stroking operations or any fill
operations of pixel aligned rectilinear geometries; those are still
rendered using trapezoids.
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![[cairo-spans] Hook up filling paths with spans to cairo-surface-fallback.c.](/~cworth/cairo/commit/test/finer-grained-fallbacks.xlib.rgb24.ref.png?h=glsl&id=18634c37026a2d6147443cb6d991576f62b07e6d){kind=link}