Carl Worth ba531642f7 Add optimization for rectilinear stroke ...

This custom stroking code allows backends to use optimized region-based
drawing operations for rectilinear strokes. This results in a 5-25x
performance improvement when drawing rectilinear shapes:

image-rgb          box-outline-stroke-100 0.18 -> 0.01: 25.58x speedup
████████████████████████▋
image-rgba         box-outline-stroke-100 0.18 -> 0.01: 25.57x speedup
████████████████████████▋
 xlib-rgb          box-outline-stroke-100 0.49 -> 0.06:  8.67x speedup
███████▋
 xlib-rgba         box-outline-stroke-100 0.22 -> 0.04:  5.39x speedup
████▍

In other words, using cairo_stroke instead of cairo_fill to draw the
same shape was 5-15x slower before, but is 1.2-2x faster now.

2006-12-22 17:59:20 -08:00

3.8 KiB

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