tree 4caa1296ee60b172d71578adda211c0b09a24ac7
parent 82b9ab8c75a76238c210d0894f805410d414b2b2
author Sam Lantinga <slouken@libsdl.org> 1595174101 -0700
committer Sam Lantinga <slouken@libsdl.org> 1595174101 -0700

Fixed bug 5231 - Fix for hardware cursor: size and alpha-premultiplication.

Manuel Alfayate Corchete

I noticed pt2-clone had problems with it's optional hardware mouse on the KMSDRM backend: cursor had a transparent block around it.
So I was investigating and it seems that a GBM cursor needs it's pixels to be alpha-premultiplied instead of straight-alpha.
A
lso, I was previously relying on "manual testing" for the cursor size, but it's far better to use whatever the DRM driver recommends via drmGetCap(): any working driver should make a size recommendation via drmGetCap(), so that's what we use now. I took this decision because I found out that the AMDGPU driver reported working cursor sizes that would appear garbled on screen, and only the recommended cursor size works.