Bug#1059943: libpoppler126: Wrong image rendering on big endian machines

[Hilmar Preusse]

Package: libpoppler126
Version: 22.12.0-2+b1
Severity: important

Dear Maintainer,

don't care about the system information below, these are just from the
system, running reportbug.

The poppler library has an issue rendering images / fonts correctly, when
running on big endian machines. Assume the following code:

#include <memory>
#include <poppler-document.h>
#include <poppler-page.h>
#include <poppler-page-renderer.h>

int main() {
  std::unique_ptr<poppler::document> doc{poppler::document::load_from_file("poppler-data.pdf")};
  std::unique_ptr<poppler::page> page{doc->create_page(0)};

  poppler::page_renderer renderer;
  poppler::image img = renderer.render_page(page.get());
  img.save("test.png", "png");
  return 0;
}

, which renders a file called "poppler-data.pdf" and creates a file called
"test.png". The mentioned sample file can be found here [1]. When compiling
and linking on amd64 the resulting png file looks reasonable...some
glyphs are missing.
Doing the same on a Big Endian box (in my case PowerPC) the picture looks
broken: the colors are different. As far as I know s390x is affected too.
Attached are the two sample files for Little and Big Endian.

Hilmar

[1] https://github.com/TeXworks/texworks/blob/main/testcases/poppler-data.pdf
-- System Information:
Debian Release: 12.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'oldstable-updates'), (500, 'oldstable-security'), (500, 'stable'), (500, 'oldstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.1.0-16-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_FIRMWARE_WORKAROUND
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libpoppler126 depends on:
ii  libc6            2.36-9+deb12u3
ii  libfontconfig1   2.14.1-4
ii  libfreetype6     2.12.1+dfsg-5
ii  libjpeg62-turbo  1:2.1.5-2
ii  liblcms2-2       2.14-2
ii  libnspr4         2:4.35-1
ii  libnss3          2:3.87.1-1
ii  libopenjp2-7     2.5.0-2
ii  libpng16-16      1.6.39-2
ii  libstdc++6       12.2.0-14
ii  libtiff6         4.5.0-6+deb12u1
ii  zlib1g           1:1.2.13.dfsg-1

Versions of packages libpoppler126 recommends:
ii  poppler-data  0.4.12-1

libpoppler126 suggests no packages.

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