97359ba5c5
This goes through all output transforms with two different buffer transforms and verifies the visual output against reference images. This commit introduces a new test input image 'basic-test-card.png'. It is a small image with deliberately odd and indivisible dimensions to provoke bad assumptions about image sizes. It contains red, green and blue areas which are actually text that makes it very obvious if you have e.g. color channels swapped. It has a white thick circle to highlight aspect ratio issues, and an orange cross to show a mixed color. The white border is for contrast and a 1px wide detail. The whole design makes it clear if the image happens to be rotated or flipped in any way. The image has one pixel wide transparent border so that bilinear sampling filter near the edges of the image would produce the same colors with both Pixman- and GL-renderers which handle the out-of-image samples fundamentally differently: Pixman assumes (0, 0, 0, 0) samples outside of the image, while GL-renderer clamps sample coordinates to the edge essentially repeating the edge pixels. It would have been "easy" to create a full matrix of every output scale & transform x every buffer scale & transform, but that would have resulted in 2 renderers * 8 output transforms * 3 output scales * 8 buffer transforms * 3 buffer scales = 1152 test cases that would have all ran strictly serially because our test harness has no parallelism inside one test program. That would have been slow to run, and need a lot more reference images too. Instead, I chose to iterate separately through all output scales & transforms (this patch) and all buffer scales & transforms (next patch). This limits the number of test cases in this patch to 56, and allows the two test programs to run in parallel. I did not even pick all possible scale & transform combinations here, but just what I think is a representative sub-set to hopefully exercise all the code paths. https://gitlab.freedesktop.org/wayland/weston/issues/52 Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
14 KiB
324x240px
14 KiB
324x240px
