Bug 711116 – dev-qt/qtgui-5.13.2: Wrong colours of non-GL widgets when using OpenGL on big endian

• Status: CONFIRMED
• Product: Gentoo Linux

[Description Marcus Comstedt 2020-02-29 21:37:20 UTC]

Created attachment 616670 [details]
Screenshot of Qt5 demo "2dpaining" showing the issue

When using a QOpenGL widget on a big endian system, widgets _other_ than the QOpenGL widgets appear in the wrong colours.

This is because the swizzling to convert from QImage::Format_ARGB32 to GL_RGBA needs to be different on big endian (ARGB -> RGBA instead of BGRA -> RGBA).

[Comment 1 Marcus Comstedt 2020-02-29 21:38:31 UTC]

Created attachment 616672 [details, diff]
Proposed patch to fix the swizzle on big endian

[Comment 2 Marcus Comstedt 2020-02-29 21:39:51 UTC]

Created attachment 616674 [details]
Screenshot of Qt5 demo "2dpainting" after applying the patch

[Comment 3 Andreas Sturmlechner 2020-02-29 21:49:12 UTC]

Is it the same with 5.14.1? If yes please send your patch upstream.

Please don't randomly add arches.

[Comment 4 Marcus Comstedt 2020-03-01 07:57:41 UTC]

As far as I can tell, the bug still exists in 5.14, 5.15 and 6.

[Comment 5 Marcus Comstedt 2020-03-01 08:17:41 UTC]

Created an upstreams report and put the link in the URL field.

[Comment 6 Andreas Sturmlechner 2020-03-20 20:13:20 UTC]

https://codereview.qt-project.org/c/qt/qtbase/+/292614