False positives? - Re: TestBot job 104977 - results: [PATCH 1/8] d2d1/tests: Test StrokeContains when last segment is bezier and closes the path

[Henri Verbeet]

On Tue, 11 Jan 2022 at 08:55, Stefan Brüns <stefan.bruens at rwth-aachen.de> wrote:
> I have rerun the test with WINETEST_DEBUG=2, see
> https://testbot.winehq.org/JobDetails.pl?Key=105001
>
> This seems to be an issue on the Debian 11 CI system. It is a small rendering
> glitch, the (first)test is supposed to paint a plain rectangle, but on Debian
> both horizontal edges are thinned by one pixel (see attached PNGs or ASCII art
> below). All 4 joins are rendered correctly.
>
> ASCII art - Win/TW  || Debian:
>
> *====*     *____*
> |    |     |    |
> |    |     |    |
> *====*     *____*
>
> On my openSUSE Tumbleweed, the output matches the reference, so it may be a
> graphics driver issue.
>
IIRC that particular machine is using llvmpipe, which unfortunately
cares a bit more about speed than correctness. Sadly, I don't think a
solution is likely to happen; sorry you ran into this.