tree 3a758de0090d3e4a6fc7260305f3ab41201b4ddd
parent 1d550b829b1441d0ab553b0fe9da9052b869bd14
author Lei Zhang <thestig@chromium.org> 1696033843 +0000
committer Pdfium LUCI CQ <pdfium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1696033843 +0000

Skia: Call UnPreMultiply() in FPDF_RenderPage()

Under certain conditions, FPDF_RenderPage() will render into a
CPDF_WindowsRenderDevice directly. Otherwise, it renders into a bitmap
first, and then render the bitmap into the CPDF_WindowsRenderDevice.
In the latter case, when Skia is the default renderer, the bitmap needs
to be un-premultiply before being passed to CPDF_WindowsRenderDevice.
The bitmap also does not need to be cleared, like with AGG. Skia renders
just fine into the newly created bitmap.

Unsuppress several pixel and corpus tests that are rendering better as a
result of this change. The new expectation files are using the updated
file name scheme from https://pdfium-review.googlesource.com/112092, so
update the presubmit to allow these new names.

Using test expectation update by rolling DEPS for testing/corpus:

https://pdfium.googlesource.com/pdfium_tests/+log/dc2cd9afdd1b..dcc9273d7f2a

Bug: pdfium:2080
Change-Id: Icb04c4c7e06b5d44a9007305e73c9ab2f9096573
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/112091
Reviewed-by: Nigi <nigi@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>