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surface-actor-wayland: Add API to pick a primary stage view

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Add a simple heuristic how to choose the primary stage view to drive events
like frame callbacks for a given surface actor.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1468>
This commit is contained in:
Robert Mader 2020-10-22 23:13:26 +02:00
parent 9db09e327c
commit ff94ed0ebf
2 changed files with 51 additions and 0 deletions
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48
src/compositor/meta-surface-actor-wayland.c
View File

@ -81,6 +81,54 @@ meta_surface_actor_wayland_try_acquire_scanout (MetaSurfaceActorWayland *self,
return scanout;
}
#define UNOBSCURED_TRESHOLD 0.1
ClutterStageView *
meta_surface_actor_wayland_get_current_primary_view (MetaSurfaceActor *actor,
ClutterStage *stage)
{
ClutterStageView *current_primary_view = NULL;
float highest_refresh_rate = 0;
float biggest_unobscurred_fraction = 0;
GList *l;
for (l = clutter_stage_peek_stage_views (stage); l; l = l->next)
{
ClutterStageView *stage_view = l->data;
float refresh_rate;
float unobscurred_fraction = 1.0;
if (clutter_actor_has_mapped_clones (CLUTTER_ACTOR (actor)))
{
if (!clutter_actor_is_effectively_on_stage_view (CLUTTER_ACTOR (actor),
stage_view))
continue;
}
else
{
if (meta_surface_actor_is_obscured_on_stage_view (actor,
stage_view,
&unobscurred_fraction))
continue;
}
refresh_rate = clutter_stage_view_get_refresh_rate (stage_view);
if ((refresh_rate > highest_refresh_rate &&
(unobscurred_fraction > UNOBSCURED_TRESHOLD ||
biggest_unobscurred_fraction < UNOBSCURED_TRESHOLD)) ||
(biggest_unobscurred_fraction < UNOBSCURED_TRESHOLD &&
unobscurred_fraction > UNOBSCURED_TRESHOLD))
{
current_primary_view = stage_view;
highest_refresh_rate = refresh_rate;
biggest_unobscurred_fraction = unobscurred_fraction;
}
}
return current_primary_view;
}
static void
meta_surface_actor_wayland_dispose (GObject *object)
{

3
src/compositor/meta-surface-actor-wayland.h
View File

@ -55,6 +55,9 @@ void meta_surface_actor_wayland_add_frame_callbacks (MetaSurfaceActorWayland *se
CoglScanout * meta_surface_actor_wayland_try_acquire_scanout (MetaSurfaceActorWayland *self,
CoglOnscreen *onscreen);
ClutterStageView * meta_surface_actor_wayland_get_current_primary_view (MetaSurfaceActor *actor,
ClutterStage *stage);
G_END_DECLS
#endif /* __META_SURFACE_ACTOR_WAYLAND_H__ */