Wedges fanning out from the center work fine for relatively simple
paths, but for paths made up of thousands of verbs, a fan is an
inefficient triangulation to give the rasterizer. This CL adds a
tessellation mode that draws the inner polygon and standalone cubics
separately, and triangulates the inner polygon by recursive
subdivision.
This reduces the stencil time from 7.4ms -> 3.0ms on desk_ynevsvg.skp.
Change-Id: Ie56e760d98e6c69e9a97752fe851726f36a7f574
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/265522
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Implements a simple first pass for a path renderer that uses the
classic Red Book "stencil then cover" method, and linearizes curves
with GPU tessellation shaders.
The new path renderer is disabled by default, and can only be enabled
in the viewer UI or by passing the "--pr gtess" flag.
Change-Id: Ic9354952e93c8b108577961760b4f0daa82d35aa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/261715
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
