GrStrokeHardwareTessellator is the only user that needs to simply
check if a cusp exists at all. Making the check local speeds up the
microbench from 502us -> 392.
Bug: chromium:1172543
Change-Id: I52adf9ef0a66e1267435e6ce41f01ee1eda17d7a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/373744
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
The stroker will need to know the cusps in order to draw circles around
them.
Bug: skia:10419
Change-Id: I05b7e9f4a5ed06bd36450e73edfaf36c4b3f5a6c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/337945
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Cubic tangents become unstable if we chop too close to 0 or 1. This
adds an epsilon to simply not chop them if it's too close.
Bug: skia:10419
Change-Id: I99e98c5d433e2cb59c767ee564e015d7ec4f7765
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/336280
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
This method finds the locations a cubic needs to be chopped at before
it can be passed to the stroke tessellation shader. It's an integral
part of CPU stroke preparation and therefore extremely perf sensitive.
Bug: skia:10419
Change-Id: Ib23c2583b8cfc78814ce52425f7af2c8b2f8b420
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/330314
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
