tree ecc24f20cc923265c39322e51d58dee6fd2460c2
parent 67137d65e1805878541fa334a35ed8e6a5ca75f7
author Hui Yingst <nigi@chromium.org> 1614123740 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1614123740 +0000

Split a path into sub paths for drawing zero area.

Currently GetZeroAreaPath() is used to calculate the zero areas formed
by a whole path. However, its output parameter `thin` `set_identity` can
be set due to a sub path (a subset of the whole path that started with
"move to" action), while affecting the rendering results of all the zero
areas formed by the whole path.

This CL adds the process to split the whole path into sub paths, and
calls DrawZeroAreaPath() to process each sub path individually. Also add
a pixel test to make sure that `set_identity` is being set for each sub
path separately.

Bug: pdfium:1638
Change-Id: I5492870e5c7e9254de346cc7d7c9255661e3abd2
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/78030
Commit-Queue: Hui Yingst <nigi@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>