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clone: scale src with apply_transform not cogl_scale

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Since a ClutterClone may be allocated a different size than its source
actor we need to apply a scale factor before painting the source actor.
We were manually using cogl_scale to do this in clutter_clone_paint but
really this kind of thing is best handled in an implementation of the
apply_transform virtual so Clutter can be aware of the transform for
other purposes, such as input transformations. Also we want to provide
an implementation of the get_paint_volume virtual where Clutter will
also expect to be able to use the apply_transform virtual to transform
the volume into its parent's coordinate space.
This commit is contained in:
Robert Bragg 2010-09-11 02:31:03 +01:00
parent ad398d583b
commit 570fa3f044
1 changed files with 30 additions and 16 deletions
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46
clutter/clutter-clone.c
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@ -119,13 +119,40 @@ clutter_clone_get_preferred_height (ClutterActor *self,
natural_height_p);
}
static void
clutter_clone_apply_transform (ClutterActor *self, CoglMatrix *matrix)
{
ClutterClonePrivate *priv = CLUTTER_CLONE (self)->priv;
ClutterGeometry geom;
ClutterGeometry source_geom;
gfloat x_scale;
gfloat y_scale;
/* First chain up and apply all the standard ClutterActor
* transformations... */
CLUTTER_ACTOR_CLASS (clutter_clone_parent_class)->apply_transform (self,
matrix);
/* get our allocated size */
clutter_actor_get_allocation_geometry (self, &geom);
/* and get the allocated size of the source */
clutter_actor_get_allocation_geometry (priv->clone_source, &source_geom);
/* We need to scale what the clone-source actor paints to fill our own
* allocation...
*/
x_scale = (gfloat) geom.width / source_geom.width;
y_scale = (gfloat) geom.height / source_geom.height;
cogl_matrix_scale (matrix, x_scale, y_scale, x_scale);
}
static void
clutter_clone_paint (ClutterActor *self)
{
ClutterClone *clone = CLUTTER_CLONE (self);
ClutterClonePrivate *priv = clone->priv;
ClutterGeometry geom, clone_geom;
gfloat x_scale, y_scale;
gboolean was_unmapped = FALSE;
if (G_UNLIKELY (priv->clone_source == NULL))
@ -136,20 +163,6 @@ clutter_clone_paint (ClutterActor *self)
clutter_actor_get_name (self) ? clutter_actor_get_name (self)
: "unknown");
/* get our allocated size */
clutter_actor_get_allocation_geometry (self, &geom);
/* and get the allocated size of the source */
clutter_actor_get_allocation_geometry (priv->clone_source, &clone_geom);
/* We need to scale what the clone-source actor paints to fill our own
* allocation...
*/
x_scale = (gfloat) geom.width / clone_geom.width;
y_scale = (gfloat) geom.height / clone_geom.height;
cogl_scale (x_scale, y_scale, 1.0);
/* The final bits of magic:
* - We need to make sure that when the clone-source actor's paint
* method calls clutter_actor_get_paint_opacity, it traverses to
@ -258,6 +271,7 @@ clutter_clone_class_init (ClutterCloneClass *klass)
g_type_class_add_private (gobject_class, sizeof (ClutterClonePrivate));
actor_class->apply_transform = clutter_clone_apply_transform;
actor_class->paint = clutter_clone_paint;
actor_class->get_preferred_width = clutter_clone_get_preferred_width;
actor_class->get_preferred_height = clutter_clone_get_preferred_height;