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Diffstat (limited to 'libweston/compositor-drm.c')
| -rw-r--r-- | libweston/compositor-drm.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c index 51b2482d..2305f708 100644 --- a/libweston/compositor-drm.c +++ b/libweston/compositor-drm.c @@ -3324,6 +3324,16 @@ drm_output_propose_state(struct weston_output *output_base, &clipped_view); if (pixman_region32_not_empty(&surface_overlap)) next_plane = primary; + + /* We do not control the stacking order of overlay planes; + * the scanout plane is strictly stacked bottom and the cursor + * plane top, but the ordering of overlay planes with respect + * to each other is undefined. Make sure we do not have two + * planes overlapping each other. */ + pixman_region32_intersect(&surface_overlap, &occluded_region, + &clipped_view); + if (pixman_region32_not_empty(&surface_overlap)) + next_plane = primary; pixman_region32_fini(&surface_overlap); if (next_plane == NULL) |