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clutter/effect: Add paint_node vfunc

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Introduce a new paint_node vfunc that, if implemented, allows
the effect to add nodes to a transient paint node that is
immediately painted. This is a transitional step until we
have fully delegated paint node rendering.

The most basic implementation of a ClutterEffect.paint_node
vfunc, and also the default implementation, is with an actor
node, as follows:

```
static void
foo_bar_paint_node (ClutterEffect           *effect,
                    ClutterPaintNode        *node,
                    ClutterPaintContext     *paint_context,
                    ClutterEffectPaintFlags  flags)
{
  g_autoptr (ClutterPaintNode) actor_node = NULL;

  actor_node = clutter_actor_node_new (effect->actor);
  clutter_paint_node_add_child (node, actor_node);
}
```

This example gives the exact same behavior of simply calling
clutter_actor_continue_paint(). In the future, the paint node
itself will be a parameter of clutter_actor_continue_paint()
and we'll be able to simplify it event more.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1340
This commit is contained in:
Georges Basile Stavracas Neto 2020-06-27 12:12:03 -03:00
parent e8f9d093b1
commit 35af306acc
2 changed files with 30 additions and 4 deletions
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30
clutter/clutter/clutter-effect.c
View File

@ -169,6 +169,8 @@
#include "clutter-effect-private.h"
#include "clutter-enum-types.h"
#include "clutter-marshal.h"
#include "clutter-paint-node-private.h"
#include "clutter-paint-nodes.h"
#include "clutter-private.h"
#include "clutter-actor-private.h"
@ -196,14 +198,29 @@ clutter_effect_real_modify_paint_volume (ClutterEffect *effect,
return TRUE;
}
static void
clutter_effect_real_paint_node (ClutterEffect *effect,
ClutterPaintNode *node,
ClutterPaintContext *paint_context,
ClutterEffectPaintFlags flags)
{
ClutterPaintNode *actor_node;
ClutterActor *actor;
actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (effect));
actor_node = clutter_actor_node_new (actor);
clutter_paint_node_add_child (node, actor_node);
clutter_paint_node_unref (actor_node);
}
static void
clutter_effect_real_paint (ClutterEffect *effect,
ClutterPaintContext *paint_context,
ClutterEffectPaintFlags flags)
{
ClutterEffectClass *effect_class = CLUTTER_EFFECT_GET_CLASS (effect);
ClutterActorMeta *actor_meta = CLUTTER_ACTOR_META (effect);
ClutterActor *actor;
ClutterPaintNode *node;
gboolean pre_paint_succeeded;
/* The default implementation provides a compatibility wrapper for
@ -212,11 +229,15 @@ clutter_effect_real_paint (ClutterEffect *effect,
pre_paint_succeeded = effect_class->pre_paint (effect, paint_context);
actor = clutter_actor_meta_get_actor (actor_meta);
clutter_actor_continue_paint (actor, paint_context);
node = clutter_effect_node_new (effect);
effect_class->paint_node (effect, node, paint_context, flags);
clutter_paint_node_paint (node, paint_context);
if (pre_paint_succeeded)
effect_class->post_paint (effect, paint_context);
clutter_paint_node_unref (node);
}
static void
@ -256,6 +277,7 @@ clutter_effect_class_init (ClutterEffectClass *klass)
klass->post_paint = clutter_effect_real_post_paint;
klass->modify_paint_volume = clutter_effect_real_modify_paint_volume;
klass->paint = clutter_effect_real_paint;
klass->paint_node = clutter_effect_real_paint_node;
klass->pick = clutter_effect_real_pick;
}

4
clutter/clutter/clutter-effect.h
View File

@ -87,6 +87,10 @@ struct _ClutterEffectClass
void (* paint) (ClutterEffect *effect,
ClutterPaintContext *paint_context,
ClutterEffectPaintFlags flags);
void (* paint_node) (ClutterEffect *effect,
ClutterPaintNode *node,
ClutterPaintContext *paint_context,
ClutterEffectPaintFlags flags);
void (* pick) (ClutterEffect *effect,
ClutterPickContext *pick_context);