libpixman- Fix for testcase failures on big-endian architectures

[Gayathri Berli]

Hi Team,

we are working on one of Debian issue regarding big-endian architectures.
Issue link:https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038447

After a lot of debugging, by upgrading librsvg and its dependency packages one after another like libcairo, libpixman and libpango, we found out that while upgrading libpixman (libpixman-1-0:s390x) package from version 0.40.0-1 to version 0.42.2-1, the test suites failed in the librsvg.



I built these packages ( i.e. cairo, pixman & pango) manually from their respective sources by resolving all the version dependencies and ran the librsvg tests to make sure that the test suites failed while upgrading pixman package from 0.40.0-1 to version 0.42.2-1..



By doing git-bisect on pixman package commits, I figured out the below mentioned commit which has changes w.r.t. big-endian architectures, introduced the regression. when I reverted this commit in the mainline repo of pixman, librsvg tests are passing.



commit b4a105d77232a87304b7b621e2f99e699a8eebd3

Author: Jocelyn Falempe <jfalempe at redhat.com<mailto:jfalempe at redhat.com>>

Date:   Wed Jun 29 10:55:43 2022 +0200

    Fix inverted colors on big endian system

    bits_image_fetch_separable_convolution_affine() didn't take care

    of big endian system

    Signed-off-by: Jocelyn Falempe <jfalempe at redhat.com<mailto:jfalempe at redhat.com>>



And I noticed that there is one open issue in pixman regarding to this commit changes which is affecting the big-endian systems. Please confirm whether this patch can/should be reverted upstream?

https://gitlab.freedesktop.org/pixman/pixman/-/issues/78



I have raised a request to allow the forking of pixman repo.. Once the request is granted, I will be able to push the changes.. I have commented in the above issue link with all the details..



The Ask is to revert the attached patch so that we will be able to fix “librsvg: FTBFS on big-endian architectures: multiple test regressions since September 2022” bug…



Thanks,

Gayathri.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/pixman/attachments/20240202/8e82f1f7/attachment.htm>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: libpixman_Fix_big-endian_architecures.txt
URL: <https://lists.freedesktop.org/archives/pixman/attachments/20240202/8e82f1f7/attachment.txt>