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Implements a generic ClutterActorClone that doesn't need fbos.

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Many use cases for clonning an actor don't require running a shader on the
resulting clone image and so requiring FBOs in these cases is overkill and
in-efficient as it requires kicking and synchronizing a render for each clone.

This approach basically just uses the paint function of another actor to
implement the painting for the clone actor with some fiddling of the model-
view matrix to scale according to the different allocation box sizes of
each of the actors.

A simple unit test called test-actors2 was added for testing.
This commit is contained in:
Robert Bragg
2009-01-17 16:51:03 +00:00
parent 6d4cd416ec
commit df7480090d
8 changed files with 697 additions and 2 deletions
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37
clutter/clutter-actor.c
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@ -263,6 +263,9 @@ struct _ClutterActorPrivate
ShaderData *shader_data;
PangoContext *pango_context;
ClutterActor *opacity_parent;
gboolean enable_model_view_transform;
};
enum
@ -1482,7 +1485,8 @@ clutter_actor_paint (ClutterActor *self)
cogl_push_matrix();
_clutter_actor_apply_modelview_transform (self);
if (priv->enable_model_view_transform)
_clutter_actor_apply_modelview_transform (self);
if (priv->has_clip)
{
@ -3029,6 +3033,9 @@ clutter_actor_init (ClutterActor *self)
priv->needs_height_request = TRUE;
priv->needs_allocation = TRUE;
priv->opacity_parent = NULL;
priv->enable_model_view_transform = TRUE;
memset (priv->clip, 0, sizeof (ClutterUnit) * 4);
}
@ -5016,7 +5023,10 @@ clutter_actor_get_paint_opacity (ClutterActor *self)
priv = self->priv;
parent = priv->parent_actor;
if (priv->opacity_parent)
parent = priv->opacity_parent;
else
parent = priv->parent_actor;
/* Factor in the actual actors opacity with parents */
if (G_LIKELY (parent))
@ -7703,3 +7713,26 @@ clutter_actor_create_pango_context (ClutterActor *self)
return retval;
}
/* Allows overriding the parent traversed when querying an actors paint
* opacity. Used by ClutterActorClone. */
void
_clutter_actor_set_opacity_parent (ClutterActor *self,
ClutterActor *parent)
{
g_return_if_fail (CLUTTER_IS_ACTOR (self));
self->priv->opacity_parent = parent;
}
/* Allows you to disable applying the actors model view transform during
* a paint. Used by ClutterActorClone. */
void
_clutter_actor_set_enable_model_view_transform (ClutterActor *self,
gboolean enable)
{
g_return_if_fail (CLUTTER_IS_ACTOR (self));
self->priv->enable_model_view_transform = enable;
}