tree a3d56e89a80f3df3358428c38f8386b9fc3649a2
parent a09b05c27ad2051bb477f61d8e9d8c1352274430
author Florin Malita <fmalita@chromium.org> 1595256667 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1595339925 +0000

[skottie] More masking fixes

Assorted bugfixes for the non-analytical mask code path.

1) SkSG modulatePaint() should only override the blend mode when
   one is specified (!= kSrcOver).

2) Some modes (notably intersect) require touching pixels outside the
   mask draw geometry.  These modes must be applied as a layer.
   Introduce an explicit layer node in SkSG, and inject for masks which
   require it.

Also refactor Subtract to use more natural blend and pathops modes,
instead of always inverting geometry.

TBR=
Change-Id: I412168d1ff61eb8e59907babe8f0e091f6fffacf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/303997
Reviewed-by: Florin Malita <fmalita@google.com>
Commit-Queue: Florin Malita <fmalita@google.com>