[Wayland-bugs] [Bug 83987] Add screenshooting based testing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83987

--- Comment #1 from Pekka Paalanen <ppaalanen at gmail.com> ---
As Derek pointed out in IRC, GL is not pixel-perfect between implementations,
so we cannot use checksumming there.

I wonder if it would be feasible to generate the reference images with the
Pixman renderer at test runtime, se don't need to store reference images in the
repository?

Listing checksums for each GL implementation is not feasible. I also would not
want to clutter Weston repository with reference images, as that would likely
be a lot of data.

Some plan for the GL-renderer would be needed. Using Pixman generated images as
the reference will limit GL testing to features that Pixman renderer supports,
but maybe that is enough?

This also reminds us, that we need to verify if the Pixman rendered results are
really intended to be pixel-perfect between Pixman releases by the Pixman
upstream.

If we cannot do checksumming at all, I fear we need a reference image
repository.

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