tree a97a460ad8effe0b72e90a2f0556115dd2095825
parent 168d065ea702e02a61a349e708fbf399ad1bd792
author K. Moon <kmoon@chromium.org> 1679510473 +0000
committer Pdfium LUCI CQ <pdfium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1679510473 +0000

[Skia] Support pre-multiplied MultiplyAlpha()

Supports MultiplyAlpha() directly on pre-multiplied alpha using native
Skia operations, rather than wrapping the CFX_DIBitmap implementation
with conversions to un-pre-multiplied alpha and back.

The Skia operations round slightly differently in some cases, requiring
expectation updates.

Fixed: pdfium:1949
Change-Id: I44b4467aa9cc0a99175e4bf99be4dd31c7c2ad78
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/105310
Reviewed-by: Nigi <nigi@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>