[mutter/gbsneto/effects-paint-nodes: 167/172] Introduce ClutterEffectNode

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 3dcdcaa08a9598e902fd866fcb55d98c1c5b7bbe
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Jul 3 17:55:25 2020 -0300

    Introduce ClutterEffectNode
    
    ClutterEffectNode is a private ClutterPaintNode implementation
    that does effectively nothing, but helps organizing the paint
    node tree. It also helps debugging, since it can output the
    effect class and name to the JSON debugging routines.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1340

 clutter/clutter/clutter-paint-node-private.h | 20 +++++++
 clutter/clutter/clutter-paint-nodes.c        | 84 ++++++++++++++++++++++++++++
 2 files changed, 104 insertions(+)
---
diff --git a/clutter/clutter/clutter-paint-node-private.h b/clutter/clutter/clutter-paint-node-private.h
index a7ee1b4bd9..acddce3be6 100644
--- a/clutter/clutter/clutter-paint-node-private.h
+++ b/clutter/clutter/clutter-paint-node-private.h
@@ -141,6 +141,26 @@ ClutterPaintNode *      clutter_paint_node_get_last_child               (Clutter
 G_GNUC_INTERNAL
 ClutterPaintNode *      clutter_paint_node_get_parent                   (ClutterPaintNode      *node);
 
+
+#define CLUTTER_TYPE_EFFECT_NODE                (clutter_effect_node_get_type ())
+#define CLUTTER_EFFECT_NODE(obj)                (G_TYPE_CHECK_INSTANCE_CAST ((obj), 
CLUTTER_TYPE_EFFECT_NODE, ClutterEffectNode))
+#define CLUTTER_IS_EFFECT_NODE(obj)             (G_TYPE_CHECK_INSTANCE_TYPE ((obj), 
CLUTTER_TYPE_EFFECT_NODE))
+
+/**
+ * ClutterEffectNode:
+ *
+ * The #ClutterEffectNode structure is an opaque
+ * type whose members cannot be directly accessed.
+ */
+typedef struct _ClutterEffectNode ClutterEffectNode;
+typedef struct _ClutterEffectNode ClutterEffectNodeClass;
+
+CLUTTER_EXPORT
+GType clutter_effect_node_get_type (void) G_GNUC_CONST;
+
+CLUTTER_EXPORT
+ClutterPaintNode * clutter_effect_node_new (ClutterEffect *actor);
+
 G_END_DECLS
 
 #endif /* __CLUTTER_PAINT_NODE_PRIVATE_H__ */
diff --git a/clutter/clutter/clutter-paint-nodes.c b/clutter/clutter/clutter-paint-nodes.c
index de2f3fdcc6..01c9419ba9 100644
--- a/clutter/clutter/clutter-paint-nodes.c
+++ b/clutter/clutter/clutter-paint-nodes.c
@@ -1216,6 +1216,90 @@ clutter_actor_node_new (ClutterActor *actor)
 }
 
 
+/*
+ * ClutterEffectNode
+ */
+
+struct _ClutterEffectNode
+{
+  ClutterPaintNode parent_instance;
+
+  ClutterEffect *effect;
+};
+
+struct _ClutterEffectNodeClass
+{
+  ClutterPaintNodeClass parent_class;
+};
+
+G_DEFINE_TYPE (ClutterEffectNode, clutter_effect_node, CLUTTER_TYPE_PAINT_NODE)
+
+static JsonNode *
+clutter_effect_node_serialize (ClutterPaintNode *node)
+{
+  ClutterEffectNode *effect_node = CLUTTER_EFFECT_NODE (node);
+  ClutterActorMeta *effect_meta = CLUTTER_ACTOR_META (effect_node->effect);
+  g_autoptr (JsonBuilder) builder = NULL;
+  g_autoptr (GString) string = NULL;
+  const char *meta_name;
+
+  meta_name = clutter_actor_meta_get_name (effect_meta);
+
+  string = g_string_new (NULL);
+  g_string_append (string, G_OBJECT_TYPE_NAME (effect_node->effect));
+  g_string_append (string, " (");
+  if (meta_name)
+    g_string_append_printf (string, "\"%s\"", meta_name);
+  else
+    g_string_append (string, "unnamed");
+  g_string_append (string, ")");
+
+  builder = json_builder_new ();
+
+  json_builder_begin_object (builder);
+  json_builder_set_member_name (builder, "effect");
+  json_builder_add_string_value (builder, string->str);
+  json_builder_end_object (builder);
+
+  return json_builder_get_root (builder);
+}
+
+static void
+clutter_effect_node_class_init (ClutterEffectNodeClass *klass)
+{
+  ClutterPaintNodeClass *node_class;
+
+  node_class = CLUTTER_PAINT_NODE_CLASS (klass);
+  node_class->serialize = clutter_effect_node_serialize;
+}
+
+static void
+clutter_effect_node_init (ClutterEffectNode *self)
+{
+}
+
+/*
+ * clutter_effect_node_new:
+ * @actor: the actor to paint
+ *
+ * Creates a new #ClutterEffectNode.
+ *
+ * Return value: (transfer full): the newly created #ClutterEffectNode.
+ *   Use clutter_paint_node_unref() when done.
+ */
+ClutterPaintNode *
+clutter_effect_node_new (ClutterEffect *effect)
+{
+  ClutterEffectNode *res;
+
+  g_assert (effect != NULL);
+
+  res = _clutter_paint_node_create (CLUTTER_TYPE_EFFECT_NODE);
+  res->effect = effect;
+
+  return (ClutterPaintNode *) res;
+}
+
 /*
  * ClutterLayerNode
  */