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ClutterActor: expose setter for the opacity override

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Toolkits may need to paint actors internally outside the normal tree
(for example to create a shadow shape), in which case they need to
control the opacity directly.

https://bugzilla.gnome.org/show_bug.cgi?id=677412

Signed-off-by: Emmanuele Bassi <ebassi@gnome.org>
This commit is contained in:
Giovanni Campagna 2012-06-04 23:42:04 +02:00 committed by Emmanuele Bassi
parent 65032da551
commit 10cce00440
6 changed files with 47 additions and 12 deletions
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3
clutter/clutter-actor-private.h
View File

@ -263,9 +263,6 @@ void _clutter_actor_rerealize
ClutterCallback callback,
gpointer data);
void _clutter_actor_set_opacity_override (ClutterActor *self,
gint opacity);
gint _clutter_actor_get_opacity_override (ClutterActor *self);
void _clutter_actor_set_in_clone_paint (ClutterActor *self,
gboolean is_in_clone_paint);

38
clutter/clutter-actor.c
View File

@ -15753,20 +15753,50 @@ clutter_actor_create_pango_layout (ClutterActor *self,
return layout;
}
/* Allows overriding the calculated paint opacity. Used by ClutterClone and
* ClutterOffscreenEffect.
/**
* clutter_actor_set_opacity_override:
* @self: a #ClutterActor
* @opacity: the override opacity value, or -1 to reset
*
* Allows overriding the calculated paint opacity (as returned by
* clutter_actor_get_paint_opacity()). This is used internally by
* ClutterClone and ClutterOffscreenEffect, and should be used by
* actors that need to mimick those.
*
* In almost all cases this should not used by applications.
*
* Stability: unstable
*/
void
_clutter_actor_set_opacity_override (ClutterActor *self,
clutter_actor_set_opacity_override (ClutterActor *self,
gint opacity)
{
g_return_if_fail (CLUTTER_IS_ACTOR (self));
/* ensure bounds */
if (opacity >= 0)
opacity = CLAMP (opacity, 0, 255);
else
opacity = -1;
self->priv->opacity_override = opacity;
}
/**
* clutter_actor_get_opacity_override:
* @self: a #ClutterActor
*
* See clutter_actor_set_opacity_override()
*
* Returns: the override value for the actor's opacity, or -1 if no override
* is set.
*
* Since: 1.22
*
* Stability: unstable
*/
gint
_clutter_actor_get_opacity_override (ClutterActor *self)
clutter_actor_get_opacity_override (ClutterActor *self)
{
g_return_val_if_fail (CLUTTER_IS_ACTOR (self), -1);

5
clutter/clutter-actor.h
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@ -829,6 +829,11 @@ void clutter_actor_remove_all_transitions
#ifdef CLUTTER_ENABLE_EXPERIMENTAL_API
CLUTTER_AVAILABLE_IN_1_16
gboolean clutter_actor_has_mapped_clones (ClutterActor *self);
CLUTTER_AVAILABLE_IN_1_22
void clutter_actor_set_opacity_override (ClutterActor *self,
gint opacity);
CLUTTER_AVAILABLE_IN_1_22
gint clutter_actor_get_opacity_override (ClutterActor *self);
#endif
G_END_DECLS

5
clutter/clutter-clone.c
View File

@ -41,6 +41,7 @@
#include "config.h"
#endif
#define CLUTTER_ENABLE_EXPERIMENTAL_API
#include "clutter-actor-private.h"
#include "clutter-clone.h"
#include "clutter-debug.h"
@ -173,7 +174,7 @@ clutter_clone_paint (ClutterActor *actor)
* the clone source actor.
*/
_clutter_actor_set_in_clone_paint (priv->clone_source, TRUE);
_clutter_actor_set_opacity_override (priv->clone_source,
clutter_actor_set_opacity_override (priv->clone_source,
clutter_actor_get_paint_opacity (actor));
_clutter_actor_set_enable_model_view_transform (priv->clone_source, FALSE);
@ -191,7 +192,7 @@ clutter_clone_paint (ClutterActor *actor)
_clutter_actor_set_enable_paint_unmapped (priv->clone_source, FALSE);
_clutter_actor_set_enable_model_view_transform (priv->clone_source, TRUE);
_clutter_actor_set_opacity_override (priv->clone_source, -1);
clutter_actor_set_opacity_override (priv->clone_source, -1);
_clutter_actor_set_in_clone_paint (priv->clone_source, FALSE);
}

6
clutter/clutter-offscreen-effect.c
View File

@ -343,8 +343,8 @@ clutter_offscreen_effect_pre_paint (ClutterEffect *effect)
* multiplying the opacity twice.
*/
priv->old_opacity_override =
_clutter_actor_get_opacity_override (priv->actor);
_clutter_actor_set_opacity_override (priv->actor, 0xff);
clutter_actor_get_opacity_override (priv->actor);
clutter_actor_set_opacity_override (priv->actor, 0xff);
return TRUE;
}
@ -413,7 +413,7 @@ clutter_offscreen_effect_post_paint (ClutterEffect *effect)
return;
/* Restore the previous opacity override */
_clutter_actor_set_opacity_override (priv->actor, priv->old_opacity_override);
clutter_actor_set_opacity_override (priv->actor, priv->old_opacity_override);
cogl_pop_matrix ();
cogl_pop_framebuffer ();

2
doc/reference/clutter/clutter-sections.txt
View File

@ -426,6 +426,8 @@ clutter_actor_set_clip_to_allocation
clutter_actor_get_clip_to_allocation
clutter_actor_set_opacity
clutter_actor_get_opacity
clutter_actor_set_opacity_override
clutter_actor_get_opacity_override
ClutterOffscreenRedirect
clutter_actor_set_offscreen_redirect
clutter_actor_get_offscreen_redirect