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mutter/clutter/clutter-stage.h
Emmanuele Bassi 0cbfabcda4 stage: Add the NO_CLEAR_ON_PAINT hint 
Some apps or some use cases don't need to clear the stage on immediate
rendering GPUs. A media player playing a fullscreen video or a
tile-based game, for instance.

These apps are redrawing the whole screen, so we can avoid clearing the
color buffer when preparing to paint the stage, since there is no
blending with the stage color being performed.

We can add an private set of hints to ClutterStage, and expose accessors
for each potential hint; the first hint is the 'no-clear' one.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2058
2010-07-13 14:57:48 +01:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
#error "Only <clutter/clutter.h> can be included directly."
#endif
#ifndef __CLUTTER_STAGE_H__
#define __CLUTTER_STAGE_H__
#include <clutter/clutter-types.h>
#include <clutter/clutter-group.h>
#include <clutter/clutter-color.h>
#include <clutter/clutter-event.h>
G_BEGIN_DECLS
#define CLUTTER_TYPE_PERSPECTIVE (clutter_perspective_get_type ())
#define CLUTTER_TYPE_FOG (clutter_fog_get_type ())
#define CLUTTER_TYPE_STAGE (clutter_stage_get_type())
#define CLUTTER_STAGE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_STAGE, ClutterStage))
#define CLUTTER_STAGE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_STAGE, ClutterStageClass))
#define CLUTTER_IS_STAGE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_STAGE))
#define CLUTTER_IS_STAGE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_STAGE))
#define CLUTTER_STAGE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_STAGE, ClutterStageClass))
#ifndef CLUTTER_DISABLE_DEPRECATED
/**
* CLUTTER_STAGE_WIDTH:
*
* Macro that evaluates to the width of the default stage
*
* Since: 0.2
*
* Deprecated: 1.2: Use clutter_actor_get_width() instead
*/
#define CLUTTER_STAGE_WIDTH() (clutter_actor_get_width (clutter_stage_get_default ()))
/**
* CLUTTER_STAGE_HEIGHT:
*
* Macro that evaluates to the height of the default stage
*
* Since: 0.2
*
* Deprecated: 1.2: use clutter_actor_get_height() instead
*/
#define CLUTTER_STAGE_HEIGHT() (clutter_actor_get_height (clutter_stage_get_default ()))
#endif /* !CLUTTER_DISABLE_DEPRECATED */
/**
* ClutterPickMode:
* @CLUTTER_PICK_NONE: Do not paint any actor
* @CLUTTER_PICK_REACTIVE: Paint only the reactive actors
* @CLUTTER_PICK_ALL: Paint all actors
*
* Controls the paint cycle of the scene graph when in pick mode
*
* Since: 1.0
*/
typedef enum {
CLUTTER_PICK_NONE = 0,
CLUTTER_PICK_REACTIVE,
CLUTTER_PICK_ALL
} ClutterPickMode;
typedef struct _ClutterPerspective ClutterPerspective;
typedef struct _ClutterFog ClutterFog;
typedef struct _ClutterStageClass ClutterStageClass;
typedef struct _ClutterStagePrivate ClutterStagePrivate;
/**
* ClutterStage:
*
* The #ClutterStage structure contains only private data
* and should be accessed using the provided API
*
* Since: 0.1
*/
struct _ClutterStage
{
/*< private >*/
ClutterGroup parent_instance;
ClutterStagePrivate *priv;
};
/**
* ClutterStageClass:
* @fullscreen: handler for the #ClutterStage::fullscreen signal
* @unfullscreen: handler for the #ClutterStage::unfullscreen signal
* @activate: handler for the #ClutterStage::activate signal
* @deactivate: handler for the #ClutterStage::deactive signal
* @delete_event: handler for the #ClutterStage::delete-event signal
*
* The #ClutterStageClass structure contains only private data
*
* Since: 0.1
*/
struct _ClutterStageClass
{
/*< private >*/
ClutterGroupClass parent_class;
/*< public >*/
/* signals */
void (* fullscreen) (ClutterStage *stage);
void (* unfullscreen) (ClutterStage *stage);
void (* activate) (ClutterStage *stage);
void (* deactivate) (ClutterStage *stage);
gboolean (* delete_event) (ClutterStage *stage,
ClutterEvent *event);
/*< private >*/
/* padding for future expansion */
gpointer _padding_dummy[31];
};
/**
* ClutterPerspective:
* @fovy: the field of view angle, in degrees, in the y direction
* @aspect: the aspect ratio that determines the field of view in the x
* direction. The aspect ratio is the ratio of x (width) to y (height)
* @z_near: the distance from the viewer to the near clipping
* plane (always positive)
* @z_far: the distance from the viewer to the far clipping
* plane (always positive)
*
* Stage perspective definition. #ClutterPerspective is only used by
* the fixed point version of clutter_stage_set_perspective().
*
* Since: 0.4
*/
struct _ClutterPerspective
{
gfloat fovy;
gfloat aspect;
gfloat z_near;
gfloat z_far;
};
/**
* ClutterFog:
* @z_near: starting distance from the viewer to the near clipping
* plane (always positive)
* @z_far: final distance from the viewer to the far clipping
* plane (always positive)
*
* Fog settings used to create the depth cueing effect.
*
* Since: 0.6
*/
struct _ClutterFog
{
gfloat z_near;
gfloat z_far;
};
GType clutter_perspective_get_type (void) G_GNUC_CONST;
GType clutter_fog_get_type (void) G_GNUC_CONST;
GType clutter_stage_get_type (void) G_GNUC_CONST;
ClutterActor *clutter_stage_get_default (void);
ClutterActor *clutter_stage_new (void);
void clutter_stage_set_color (ClutterStage *stage,
const ClutterColor *color);
void clutter_stage_get_color (ClutterStage *stage,
ClutterColor *color);
void clutter_stage_set_perspective (ClutterStage *stage,
ClutterPerspective *perspective);
void clutter_stage_get_perspective (ClutterStage *stage,
ClutterPerspective *perspective);
void clutter_stage_set_fullscreen (ClutterStage *stage,
gboolean fullscreen);
gboolean clutter_stage_get_fullscreen (ClutterStage *stage);
void clutter_stage_show_cursor (ClutterStage *stage);
void clutter_stage_hide_cursor (ClutterStage *stage);
ClutterActor *clutter_stage_get_actor_at_pos (ClutterStage *stage,
ClutterPickMode pick_mode,
gint x,
gint y);
guchar * clutter_stage_read_pixels (ClutterStage *stage,
gint x,
gint y,
gint width,
gint height);
gboolean clutter_stage_event (ClutterStage *stage,
ClutterEvent *event);
void clutter_stage_set_title (ClutterStage *stage,
const gchar *title);
G_CONST_RETURN gchar *clutter_stage_get_title (ClutterStage *stage);
void clutter_stage_set_user_resizable (ClutterStage *stage,
gboolean resizable);
gboolean clutter_stage_get_user_resizable (ClutterStage *stage);
void clutter_stage_set_use_fog (ClutterStage *stage,
gboolean fog);
gboolean clutter_stage_get_use_fog (ClutterStage *stage);
void clutter_stage_set_fog (ClutterStage *stage,
ClutterFog *fog);
void clutter_stage_get_fog (ClutterStage *stage,
ClutterFog *fog);
void clutter_stage_set_key_focus (ClutterStage *stage,
ClutterActor *actor);
ClutterActor * clutter_stage_get_key_focus (ClutterStage *stage);
void clutter_stage_ensure_current (ClutterStage *stage);
void clutter_stage_queue_redraw (ClutterStage *stage);
gboolean clutter_stage_is_default (ClutterStage *stage);
void clutter_stage_ensure_viewport (ClutterStage *stage);
void clutter_stage_ensure_redraw (ClutterStage *stage);
void clutter_stage_set_throttle_motion_events (ClutterStage *stage,
gboolean throttle);
gboolean clutter_stage_get_throttle_motion_events (ClutterStage *stage);
void clutter_stage_set_use_alpha (ClutterStage *stage,
gboolean use_alpha);
gboolean clutter_stage_get_use_alpha (ClutterStage *stage);
void clutter_stage_set_minimum_size (ClutterStage *stage,
guint width,
guint height);
void clutter_stage_get_minimum_size (ClutterStage *stage,
guint *width,
guint *height);
void clutter_stage_set_no_clear_hint (ClutterStage *stage,
gboolean no_clear);
gboolean clutter_stage_get_no_clear_hint (ClutterStage *stage);
/* Commodity macro, for mallum only */
#define clutter_stage_add(stage,actor) G_STMT_START { \
if (CLUTTER_IS_STAGE ((stage)) && CLUTTER_IS_ACTOR ((actor))) \
{ \
ClutterContainer *_container = (ClutterContainer *) (stage); \
ClutterActor *_actor = (ClutterActor *) (actor); \
clutter_container_add_actor (_container, _actor); \
} } G_STMT_END
G_END_DECLS
#endif /* __CLUTTER_STAGE_H__ */
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