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render/egl: fix swapping with no damage 

According to the spec:

> If <n_rects> is 0 then <rects> is ignored and the entire
> surface is implicitly damaged and the behaviour is equivalent
> to calling eglSwapBuffers.

When we want to swap with an empty damage region, set the damage to a single
empty rectangle.
This commit is contained in:
Simon Ser 2019-04-25 19:35:40 +03:00 committed by Drew DeVault
parent 736632ad4e
commit d6e250b389
1 changed files with 8 additions and 0 deletions
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8
render/egl.c
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@ -377,6 +377,14 @@ bool wlr_egl_swap_buffers(struct wlr_egl *egl, EGLSurface surface,
pixman_region32_fini(&flipped_damage); pixman_region32_fini(&flipped_damage);
if (nrects == 0) {
// Swapping with no rects is the same as swapping with the entire
// surface damaged. To swap with no damage, we set the damage region
// to a single empty rectangle.
nrects = 1;
memset(egl_damage, 0, sizeof(egl_damage));
}
if (egl->exts.swap_buffers_with_damage_ext) { if (egl->exts.swap_buffers_with_damage_ext) {
ret = eglSwapBuffersWithDamageEXT(egl->display, surface, egl_damage, ret = eglSwapBuffersWithDamageEXT(egl->display, surface, egl_damage,
nrects); nrects);