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44a7f74dcd
By the looks of it, commit 95e9fa10ef was taping over an Intel DRI bug that would make it return post-swizzling pixel data on glReadPixels(). There's been reports over time of that commit resulting in wrong colors on other drivers, and lately Mesa >17.3 started showing the same symptoms on Intel. But texture swizzling works by changing parameters before fragment shaders and reading pixels from an already drawn FBO/texture doesn't involve those. This should thus use pixel_format_to_gl_with_target(), which will result in correctly requesting the same pixel format than the underlying texture, while still considering it BGRA for the upper layers in the swizzling case. https://gitlab.gnome.org/GNOME/mutter/issues/72 Closes: #72