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clutter/actor: Add CLUTTER_OFFSCREEN_REDIRECT_ON_IDLE

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Which offscreens actor rendering only in cases where it hasn't changed for
2 frames or more. This avoids the performance penalty of offscreening an
actor whose content is trying to animate at full frame rate. It will
switch automatically.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/1069
This commit is contained in:
Daniel van Vugt
2020-02-19 14:05:57 +08:00
parent c5d2fc856a
commit 282b09c17e
4 changed files with 118 additions and 4 deletions
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88
src/tests/clutter/conform/actor-offscreen-redirect.c
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@ -193,6 +193,9 @@ verify_redraws (gpointer user_data)
{
Data *data = user_data;
clutter_actor_set_offscreen_redirect (data->container,
CLUTTER_OFFSCREEN_REDIRECT_ALWAYS);
/* Queueing a redraw on the actor should cause a redraw */
clutter_actor_queue_redraw (data->container);
verify_redraw (data, 1);
@ -220,6 +223,7 @@ static gboolean
run_verify (gpointer user_data)
{
Data *data = user_data;
int i;
group_has_overlaps = FALSE;
@ -313,6 +317,90 @@ run_verify (gpointer user_data)
0,
255);
/* ON_IDLE: Defer redirection through the FBO until it is deemed to be the
* best performing option, which means when the actor's contents have
* stopped changing.
*/
clutter_actor_set_offscreen_redirect (data->container,
CLUTTER_OFFSCREEN_REDIRECT_ON_IDLE);
/* Changing modes should not incur a redraw */
verify_results (data,
255, 0, 0,
0,
255);
/* These will incur a redraw because the actor is dirty: */
for (i = 0; i < 10; i++)
{
clutter_actor_queue_redraw (data->container);
verify_results (data,
255, 0, 0,
1,
255);
}
/* The actor is not dirty, but also not yet cached so a redraw is expected */
verify_results (data,
255, 0, 0,
1,
255);
/* These will NOT incur a redraw because the actor is unchanged: */
for (i = 0; i < 10; i++)
{
verify_results (data,
255, 0, 0,
0,
255);
}
/* The first opacity change should require no redaw */
clutter_actor_set_opacity (data->container, 64);
verify_results (data,
255, 191, 191,
0,
255);
/* The second opacity change should require no redaw */
clutter_actor_set_opacity (data->container, 127);
verify_results (data,
255, 127, 127,
0,
255);
/* The third opacity change should require no redaw */
clutter_actor_set_opacity (data->container, 255);
verify_results (data,
255, 0, 0,
0,
255);
/* Now several frames without the actor changing AND the FBO is populated.
* Expect no internal repaints.
*/
for (i = 0; i < 10; i++)
{
verify_results (data,
255, 0, 0,
0,
255);
}
/* Another opacity change, no redraw expected */
clutter_actor_set_opacity (data->container, 127);
verify_results (data,
255, 127, 127,
0,
255);
/* Finally the actor's content changes so a redraw is expected */
clutter_actor_queue_redraw (data->container);
verify_results (data,
255, 127, 127,
1,
127);
/* Check redraws */
g_idle_add (verify_redraws, data);