compositor-drm: Don't use overlay when surface alpha != 1.0f

Assume that overlays can't handle alpha blending even with a constant
alpha factor.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

diff --git a/src/compositor-drm.c b/src/compositor-drm.c
index f360568..2dca85c 100644 (file)
--- a/src/compositor-drm.c
+++ b/src/compositor-drm.c
@@ -596,6 +596,9 @@ drm_output_prepare_overlay_surface(struct weston_output *output_base,
        if (es->buffer == NULL)
                return NULL;
 
+       if (es->alpha != 1.0f)
+               return NULL;
+
        if (wl_buffer_is_shm(es->buffer))
                return NULL;