tree 344223f3b724925d57b66161f32b55e9d364c614
parent 014c240296ae7f2c5d967d2bf583197c18bfee95
author Hui Yingst <nigi@chromium.org> 1664212362 +0000
committer Pdfium LUCI CQ <pdfium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1664212362 +0000

[Skia] Create a new palette when upsampling 1-bit-per-pixel bitmaps

For a 1-bit-per-pixel bitmap, its color palette sometimes stands for
the boundary of a range of colors instead of just 2 colors.

In Upsample(), this CL adds the process to create a new palette based
on this range and uses it for upsampling the bitmap to 32 bits per
pixel.

Meanwhile, move the process that fills a 32-bit-per-pixel buffer with
the palette into a helper Fill32BppDestStorageWithPalette() so that
this process can be reused within Upsample().

Bug: pdfium:1810
Change-Id: Ia2c4394d8d7d0809a3987d5a3304e7c7892ade6f
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/98175
Commit-Queue: Nigi <nigi@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>