tree a003c24208f4220caf3db6d720e7aa49bd489ca1
parent 67e21a19259bcd280dc7c1bdfd4d14202788bcb9
author Chris Dalton <csmartdalton@google.com> 1590097576 -0600
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1590099545 +0000

Disable WebGL antialias in CanvasKit

We were accidentally turning on MSAA via the "antialias" context attrib,
then feeding the render target into Ganesh and saying it was non-MSAA.

This will cause rendering artifacts in Ganesh if MSAA is unknowingly
enabled when we try to do coverage-based AA.

Also, the WebGL spec does not give us control over the exact sample
count or even guarantee that "antialias" means MSAA, so I think it's
best to leave that flag disabled by default. If a client wants MSAA,
they can create their own offscreen surface and blit it into the main
canvas.

Change-Id: I45f1596bfe9258963cff4b5d0a3921c5ba43145f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/291029
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Kevin Lubick <kjlubick@google.com>