tree fa61572cc0cd840b6eab2d9ebf49ac7145558bb2
parent 6d8f75d6475b0a3f57a2d2a3a5b6b6c463b56337
author Xianzhu Wang <wangxianzhu@chromium.org> 1617410178 -0700
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1617411587 -0700

Expand synthesized clip layer by 1 pixel

Though the clip mask layer and the masked layer are perfectly aligned in
blink and cc, the geometry of the quads may go through different mapping
code paths, depending on the types of the quads, causing slight
misalignment of the mask quad and masked quad and hairline align the
edges. Expand the mask layer by 1 pixel to ensure its coverage on the
masked layer in case of floating-point errors etc.

Bug: 1171601
Change-Id: I4b64e1b6147d4e003a1ad131a605ee4b9886d57f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2786129
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#869019}