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ee_wayland: Set opaque region for alphaless surfaces 

Theoretically this shouldn't be necessary, but it may be possible for
a backend to give us a visual with translucency even if we didn't ask
for one.

also better comments.

Differential Revision: https://phab.enlightenment.org/D7248

Signed-off-by: Derek Foreman <derek.foreman.samsung@gmail.com>
This commit is contained in:
Derek Foreman 2018-11-08 14:42:38 -06:00
parent 883058b92b
commit 1f709470c5
1 changed files with 17 additions and 0 deletions
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17
src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_common.c
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@ -265,12 +265,29 @@ _ecore_evas_wayland_window_update(Ecore_Evas *ee, Ecore_Evas_Engine_Wl_Data *wda
fullw = w + fw - shw;
fullh = h + fh - shh;
/* shadow but no window alpha means we have a translucent visual but the
* window contents are always opaque - we can set the opaque region
* hint so the compositor can render more efficiently
*/
if (has_shadow && !ee->alpha)
{
ecore_wl2_window_opaque_region_set(wdata->win,
ee->shadow.l, ee->shadow.t,
fullw, fullh);
}
/* No alpha, no shadows - this should really not be a visual capable
* of translucent behaviour, but just in case things are sketchy in
* the back-end, let the compositor know we're fully opaque.
*/
else if (!ee->alpha)
{
ecore_wl2_window_opaque_region_set(wdata->win,
0, 0,
fullw, fullh);
}
/* alpha is set and we might use it, so we'd better clear the
* opaque region, let the compositor blend it all.
*/
else
{
ecore_wl2_window_opaque_region_set(wdata->win, 0, 0, 0, 0);