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clutter/paint-nodes: Add opacity overriding to ClutterActorNode

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Some effects, such as ShellBlurEffect and ClutterOffscreenEffect, need
to make sure the actor is painted fully opaque. With ClutterActorNode,
however, that is currently not possible.

Add a new 'opacity' parameter to clutter_actor_node_new(). It follows
the opacity override heuristic, where -1 means disable, and anything
else is clamped to [0, 255].

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1340
This commit is contained in:
Georges Basile Stavracas Neto 2020-07-05 16:27:08 -03:00 committed by Robert Mader
parent 5d11104a0a
commit 0caca4fc49
4 changed files with 24 additions and 4 deletions
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2
clutter/clutter/clutter-actor.c
View File

@ -3746,7 +3746,7 @@ clutter_actor_paint (ClutterActor *self,
if (!CLUTTER_ACTOR_IS_MAPPED (self))
return;
actor_node = clutter_actor_node_new (self);
actor_node = clutter_actor_node_new (self, -1);
root_node = clutter_paint_node_ref (actor_node);
if (priv->has_clip)

2
clutter/clutter/clutter-effect.c
View File

@ -209,7 +209,7 @@ clutter_effect_real_paint_node (ClutterEffect *effect,
actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (effect));
actor_node = clutter_actor_node_new (actor);
actor_node = clutter_actor_node_new (actor, -1);
clutter_paint_node_add_child (node, actor_node);
clutter_paint_node_unref (actor_node);
}

21
clutter/clutter/clutter-paint-nodes.c
View File

@ -1115,6 +1115,8 @@ struct _ClutterActorNode
ClutterPaintNode parent_instance;
ClutterActor *actor;
int opacity_override;
int saved_opacity_override;
};
struct _ClutterActorNodeClass
@ -1130,6 +1132,14 @@ clutter_actor_node_pre_draw (ClutterPaintNode *node,
{
ClutterActorNode *actor_node = CLUTTER_ACTOR_NODE (node);
if (actor_node->opacity_override != -1)
{
actor_node->saved_opacity_override =
clutter_actor_get_opacity_override (actor_node->actor);
clutter_actor_set_opacity_override (actor_node->actor,
actor_node->opacity_override);
}
CLUTTER_SET_PRIVATE_FLAGS (actor_node->actor, CLUTTER_IN_PAINT);
return TRUE;
@ -1151,6 +1161,12 @@ clutter_actor_node_post_draw (ClutterPaintNode *node,
ClutterActorNode *actor_node = CLUTTER_ACTOR_NODE (node);
CLUTTER_UNSET_PRIVATE_FLAGS (actor_node->actor, CLUTTER_IN_PAINT);
if (actor_node->opacity_override != -1)
{
clutter_actor_set_opacity_override (actor_node->actor,
actor_node->saved_opacity_override);
}
}
static JsonNode *
@ -1192,6 +1208,7 @@ clutter_actor_node_init (ClutterActorNode *self)
/*
* clutter_actor_node_new:
* @actor: the actor to paint
* @opacity: opacity to draw the actor with, or -1 to use the actor's opacity
*
* Creates a new #ClutterActorNode.
*
@ -1203,7 +1220,8 @@ clutter_actor_node_init (ClutterActorNode *self)
* Use clutter_paint_node_unref() when done.
*/
ClutterPaintNode *
clutter_actor_node_new (ClutterActor *actor)
clutter_actor_node_new (ClutterActor *actor,
int opacity)
{
ClutterActorNode *res;
@ -1211,6 +1229,7 @@ clutter_actor_node_new (ClutterActor *actor)
res = _clutter_paint_node_create (CLUTTER_TYPE_ACTOR_NODE);
res->actor = actor;
res->opacity_override = CLAMP (opacity, -1, 255);
return (ClutterPaintNode *) res;
}

3
clutter/clutter/clutter-paint-nodes.h
View File

@ -160,7 +160,8 @@ CLUTTER_EXPORT
GType clutter_actor_node_get_type (void) G_GNUC_CONST;
CLUTTER_EXPORT
ClutterPaintNode * clutter_actor_node_new (ClutterActor *actor);
ClutterPaintNode * clutter_actor_node_new (ClutterActor *actor,
int opacity);
#define CLUTTER_TYPE_ROOT_NODE (clutter_root_node_get_type ())
#define CLUTTER_ROOT_NODE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_ROOT_NODE, ClutterRootNode))