tree dcb96cb1e44f38b02bda82c8262908283071b2f0
parent 01ea024b74dc8fcc16001792ef5b20b53f3959f0
author Hui Yingst <nigi@chromium.org> 1680140778 +0000
committer Pdfium LUCI CQ <pdfium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1680140778 +0000

Add fallback color space check when choosing JpxDecodeAction

The component number in JPX image info and the component number in a
PDF's color space are two different concepts. The component number
from a JPX image info might have included extra info besides color
channels. Therefore the correct decode action should be based on the
color space type from the PDF entry and the JPX image info instead of
the the component number from the JPX image info.

This CL implements the following improvements:
(1) When a /ColorSpace entry is available in the PDF, use that PDF
    color space component number and JPX image color space type to
    determine the decode action.
(2) When /ColorSpace entry is not available, use JPX image color space
    type to determine the decode action.
(3) Since the component number in JPX image info doesn't stand for the
    correct color channel number, pass the correct color channel
    number into CJPX_Decoder::Decode().

Bug: pdfium:1747
Change-Id: I2c74ef1e15b4cc8353fd5b23de7eb10eca140e64
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/104031
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Nigi <nigi@chromium.org>