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mutter/clutter/clutter-backend.c
Emmanuele Bassi 2b81d90dd7 Eliminate G_CONST_RETURN 
The G_CONST_RETURN define in GLib is, and has always been, a bit fuzzy.

We always used it to conform to the platform, at least for public-facing
API.

At first I assumed it has something to do with brain-damaged compilers
or with weird platforms where const was not really supported; sadly,
it's something much, much worse: it's a define that can be toggled at
compile-time to remove const from the signature of public API. This is a
truly terrifying feature that I assume was added in the past century,
and whose inception clearly had something to do with massive doses of
absynthe and opium — because any other explanation would make the
existence of such a feature even worse than assuming drugs had anything
to do with it.

Anyway, and pleasing the gods, this dubious feature is being
removed/deprecated in GLib; see bug:

  https://bugzilla.gnome.org/show_bug.cgi?id=644611

Before deprecation, though, we should just remove its usage from the
whole API. We should especially remove its usage from Cally's internals,
since there it never made sense in the first place.
2011-06-07 16:06:24 +01:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By:
* Matthew Allum <mallum@openedhand.com>
* Emmanuele Bassi <ebassi@linux.intel.com>
*
* Copyright (C) 2006, 2007, 2008 OpenedHand Ltd
* Copyright (C) 2009, 2010 Intel Corp
*
* 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/>.
*/
/**
* SECTION:clutter-backend
* @short_description: Backend abstraction
*
* Clutter can be compiled against different backends. Each backend
* has to implement a set of functions, in order to be used by Clutter.
*
* #ClutterBackend is the base class abstracting the various implementation;
* it provides a basic API to query the backend for generic information
* and settings.
*
* #ClutterBackend is available since Clutter 0.4
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-backend-private.h"
#include "clutter-debug.h"
#include "clutter-event-private.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
#include "clutter-profile.h"
#include "clutter-stage-manager-private.h"
#include "clutter-stage-private.h"
#include "clutter-version.h"
#include <cogl/cogl.h>
G_DEFINE_ABSTRACT_TYPE (ClutterBackend, clutter_backend, G_TYPE_OBJECT);
#define DEFAULT_FONT_NAME "Sans 10"
#define CLUTTER_BACKEND_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_BACKEND, ClutterBackendPrivate))
struct _ClutterBackendPrivate
{
cairo_font_options_t *font_options;
gchar *font_name;
gfloat units_per_em;
gint32 units_serial;
GList *event_translators;
};
enum
{
RESOLUTION_CHANGED,
FONT_CHANGED,
SETTINGS_CHANGED,
LAST_SIGNAL
};
static guint backend_signals[LAST_SIGNAL] = { 0, };
static void
clutter_backend_dispose (GObject *gobject)
{
ClutterBackendPrivate *priv = CLUTTER_BACKEND (gobject)->priv;
/* clear the events still in the queue of the main context */
_clutter_clear_events_queue ();
/* remove all event translators */
if (priv->event_translators != NULL)
{
g_list_free (priv->event_translators);
priv->event_translators = NULL;
}
G_OBJECT_CLASS (clutter_backend_parent_class)->dispose (gobject);
}
static void
clutter_backend_finalize (GObject *gobject)
{
ClutterBackend *backend = CLUTTER_BACKEND (gobject);
g_free (backend->priv->font_name);
clutter_backend_set_font_options (backend, NULL);
G_OBJECT_CLASS (clutter_backend_parent_class)->finalize (gobject);
}
static gfloat
get_units_per_em (ClutterBackend *backend,
PangoFontDescription *font_desc)
{
gfloat units_per_em = -1.0;
gboolean free_font_desc = FALSE;
gdouble dpi;
dpi = clutter_backend_get_resolution (backend);
if (font_desc == NULL)
{
ClutterSettings *settings;
gchar *font_name = NULL;
settings = clutter_settings_get_default ();
g_object_get (settings, "font-name", &font_name, NULL);
if (G_LIKELY (font_name != NULL && *font_name != '\0'))
{
font_desc = pango_font_description_from_string (font_name);
free_font_desc = TRUE;
g_free (font_name);
}
}
if (font_desc != NULL)
{
gdouble font_size = 0;
gint pango_size;
gboolean is_absolute;
pango_size = pango_font_description_get_size (font_desc);
is_absolute = pango_font_description_get_size_is_absolute (font_desc);
/* "absolute" means "device units" (usually, pixels); otherwise,
* it means logical units (points)
*/
if (is_absolute)
font_size = (gdouble) pango_size / PANGO_SCALE;
else
font_size = (gdouble) pango_size / PANGO_SCALE
* dpi
/ 96.0f;
/* 10 points at 96 DPI is 13.3 pixels */
units_per_em = (1.2f * font_size)
* dpi
/ 96.0f;
}
else
units_per_em = -1.0f;
if (free_font_desc)
pango_font_description_free (font_desc);
return units_per_em;
}
static void
clutter_backend_real_resolution_changed (ClutterBackend *backend)
{
ClutterBackendPrivate *priv = backend->priv;
ClutterMainContext *context;
ClutterSettings *settings;
gint dpi;
settings = clutter_settings_get_default ();
g_object_get (settings, "font-dpi", &dpi, NULL);
context = _clutter_context_get_default ();
if (context->font_map != NULL)
cogl_pango_font_map_set_resolution (context->font_map, dpi / 1024.0);
priv->units_per_em = get_units_per_em (backend, NULL);
priv->units_serial += 1;
CLUTTER_NOTE (BACKEND, "Units per em: %.2f", priv->units_per_em);
}
static void
clutter_backend_real_font_changed (ClutterBackend *backend)
{
ClutterBackendPrivate *priv = backend->priv;
priv->units_per_em = get_units_per_em (backend, NULL);
priv->units_serial += 1;
CLUTTER_NOTE (BACKEND, "Units per em: %.2f", priv->units_per_em);
}
static void
clutter_backend_real_redraw (ClutterBackend *backend,
ClutterStage *stage)
{
ClutterStageWindow *impl;
if (CLUTTER_ACTOR_IN_DESTRUCTION (stage))
return;
impl = _clutter_stage_get_window (stage);
if (impl == NULL)
return;
_clutter_stage_window_redraw (impl);
}
static gboolean
clutter_backend_real_translate_event (ClutterBackend *backend,
gpointer native,
ClutterEvent *event)
{
ClutterBackendPrivate *priv = backend->priv;
GList *l;
for (l = priv->event_translators;
l != NULL;
l = l->next)
{
ClutterEventTranslator *translator = l->data;
ClutterTranslateReturn retval;
retval = _clutter_event_translator_translate_event (translator,
native,
event);
if (retval == CLUTTER_TRANSLATE_QUEUE)
return TRUE;
if (retval == CLUTTER_TRANSLATE_REMOVE)
return FALSE;
}
return FALSE;
}
static void
clutter_backend_class_init (ClutterBackendClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->dispose = clutter_backend_dispose;
gobject_class->finalize = clutter_backend_finalize;
g_type_class_add_private (gobject_class, sizeof (ClutterBackendPrivate));
backend_signals[RESOLUTION_CHANGED] =
g_signal_new (I_("resolution-changed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (ClutterBackendClass, resolution_changed),
NULL, NULL,
_clutter_marshal_VOID__VOID,
G_TYPE_NONE, 0);
backend_signals[FONT_CHANGED] =
g_signal_new (I_("font-changed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (ClutterBackendClass, font_changed),
NULL, NULL,
_clutter_marshal_VOID__VOID,
G_TYPE_NONE, 0);
backend_signals[SETTINGS_CHANGED] =
g_signal_new (I_("settings-changed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (ClutterBackendClass, settings_changed),
NULL, NULL,
_clutter_marshal_VOID__VOID,
G_TYPE_NONE, 0);
klass->resolution_changed = clutter_backend_real_resolution_changed;
klass->font_changed = clutter_backend_real_font_changed;
klass->translate_event = clutter_backend_real_translate_event;
klass->redraw = clutter_backend_real_redraw;
}
static void
clutter_backend_init (ClutterBackend *backend)
{
ClutterBackendPrivate *priv;
priv = backend->priv = CLUTTER_BACKEND_GET_PRIVATE (backend);
priv->units_per_em = -1.0;
priv->units_serial = 1;
}
void
_clutter_backend_add_options (ClutterBackend *backend,
GOptionGroup *group)
{
ClutterBackendClass *klass;
g_assert (CLUTTER_IS_BACKEND (backend));
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (klass->add_options)
klass->add_options (backend, group);
}
gboolean
_clutter_backend_pre_parse (ClutterBackend *backend,
GError **error)
{
ClutterBackendClass *klass;
g_assert (CLUTTER_IS_BACKEND (backend));
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (klass->pre_parse)
return klass->pre_parse (backend, error);
return TRUE;
}
gboolean
_clutter_backend_post_parse (ClutterBackend *backend,
GError **error)
{
ClutterBackendClass *klass;
g_assert (CLUTTER_IS_BACKEND (backend));
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (klass->post_parse)
return klass->post_parse (backend, error);
return TRUE;
}
ClutterStageWindow *
_clutter_backend_create_stage (ClutterBackend *backend,
ClutterStage *wrapper,
GError **error)
{
ClutterBackendClass *klass;
ClutterStageManager *stage_manager;
ClutterStageWindow *stage_window;
g_assert (CLUTTER_IS_BACKEND (backend));
g_assert (CLUTTER_IS_STAGE (wrapper));
stage_manager = clutter_stage_manager_get_default ();
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (klass->create_stage != NULL)
stage_window = klass->create_stage (backend, wrapper, error);
else
stage_window = NULL;
if (stage_window == NULL)
return NULL;
g_assert (CLUTTER_IS_STAGE_WINDOW (stage_window));
_clutter_stage_set_window (wrapper, stage_window);
_clutter_stage_manager_add_stage (stage_manager, wrapper);
return stage_window;
}
void
_clutter_backend_redraw (ClutterBackend *backend,
ClutterStage *stage)
{
CLUTTER_STATIC_COUNTER (redraw_counter,
"_clutter_backend_redraw counter",
"Increments for each _clutter_backend_redraw call",
0 /* no application private data */);
CLUTTER_STATIC_TIMER (redraw_timer,
"Master Clock", /* parent */
"Redrawing",
"The time spent redrawing everything",
0 /* no application private data */);
CLUTTER_COUNTER_INC (_clutter_uprof_context, redraw_counter);
CLUTTER_TIMER_START (_clutter_uprof_context, redraw_timer);
CLUTTER_BACKEND_GET_CLASS (backend)->redraw (backend, stage);
CLUTTER_TIMER_STOP (_clutter_uprof_context, redraw_timer);
}
gboolean
_clutter_backend_create_context (ClutterBackend *backend,
GError **error)
{
ClutterBackendClass *klass;
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (klass->create_context)
return klass->create_context (backend, error);
return TRUE;
}
void
_clutter_backend_ensure_context_internal (ClutterBackend *backend,
ClutterStage *stage)
{
ClutterBackendClass *klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (G_LIKELY (klass->ensure_context))
klass->ensure_context (backend, stage);
}
void
_clutter_backend_ensure_context (ClutterBackend *backend,
ClutterStage *stage)
{
static ClutterStage *current_context_stage = NULL;
g_assert (CLUTTER_IS_BACKEND (backend));
g_assert (CLUTTER_IS_STAGE (stage));
if (current_context_stage != stage || !CLUTTER_ACTOR_IS_REALIZED (stage))
{
ClutterStage *new_stage = NULL;
if (!CLUTTER_ACTOR_IS_REALIZED (stage))
{
new_stage = NULL;
CLUTTER_NOTE (MULTISTAGE,
"Stage [%p] is not realized, unsetting the stage",
stage);
}
else
{
new_stage = stage;
CLUTTER_NOTE (MULTISTAGE,
"Setting the new stage [%p]",
new_stage);
}
_clutter_backend_ensure_context_internal (backend, new_stage);
/* XXX: Until Cogl becomes fully responsible for backend windows
* Clutter need to manually keep it informed of the current window size
*
* NB: This must be done after we ensure_context above because Cogl
* always assumes there is a current GL context.
*/
if (new_stage)
{
float width, height;
clutter_actor_get_size (CLUTTER_ACTOR (stage), &width, &height);
cogl_onscreen_clutter_backend_set_size (width, height);
/* Eventually we will have a separate CoglFramebuffer for
* each stage and each one will track private projection
* matrix and viewport state, but until then we need to make
* sure we update the projection and viewport whenever we
* switch between stages.
*
* This dirty mechanism will ensure they are asserted before
* the next paint... */
_clutter_stage_dirty_viewport (stage);
_clutter_stage_dirty_projection (stage);
}
/* FIXME: With a NULL stage and thus no active context it may make more
* sense to clean the context but then re call with the default stage
* so at least there is some kind of context in place (as to avoid
* potential issue of GL calls with no context)
*/
current_context_stage = new_stage;
}
else
CLUTTER_NOTE (MULTISTAGE, "Stage is the same");
}
ClutterFeatureFlags
_clutter_backend_get_features (ClutterBackend *backend)
{
ClutterBackendClass *klass;
GError *error;
g_assert (CLUTTER_IS_BACKEND (backend));
klass = CLUTTER_BACKEND_GET_CLASS (backend);
/* we need to have a context here; so we create the
* GL context first and the ask for features. if the
* context already exists this should be a no-op
*/
error = NULL;
if (klass->create_context != NULL)
{
gboolean res;
res = klass->create_context (backend, &error);
if (!res)
{
if (error)
{
g_critical ("Unable to create a context: %s", error->message);
g_error_free (error);
}
else
g_critical ("Unable to create a context: unknown error");
return 0;
}
}
if (klass->get_features)
return klass->get_features (backend);
return 0;
}
void
_clutter_backend_init_events (ClutterBackend *backend)
{
ClutterBackendClass *klass;
g_assert (CLUTTER_IS_BACKEND (backend));
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (klass->init_events)
klass->init_events (backend);
}
gfloat
_clutter_backend_get_units_per_em (ClutterBackend *backend,
PangoFontDescription *font_desc)
{
ClutterBackendPrivate *priv;
priv = backend->priv;
/* recompute for the font description, but do not cache the result */
if (font_desc != NULL)
return get_units_per_em (backend, font_desc);
if (priv->units_per_em < 0)
priv->units_per_em = get_units_per_em (backend, NULL);
return priv->units_per_em;
}
void
_clutter_backend_copy_event_data (ClutterBackend *backend,
const ClutterEvent *src,
ClutterEvent *dest)
{
ClutterBackendClass *klass;
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (klass->copy_event_data != NULL)
klass->copy_event_data (backend, src, dest);
}
void
_clutter_backend_free_event_data (ClutterBackend *backend,
ClutterEvent *event)
{
ClutterBackendClass *klass;
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (klass->free_event_data != NULL)
klass->free_event_data (backend, event);
}
/**
* clutter_get_default_backend:
*
* Retrieves the default #ClutterBackend used by Clutter. The
* #ClutterBackend holds backend-specific configuration options.
*
* Return value: (transfer none): the default backend. You should
* not ref or unref the returned object. Applications should rarely
* need to use this.
*
* Since: 0.4
*/
ClutterBackend *
clutter_get_default_backend (void)
{
ClutterMainContext *clutter_context;
clutter_context = _clutter_context_get_default ();
return clutter_context->backend;
}
/**
* clutter_backend_set_double_click_time:
* @backend: a #ClutterBackend
* @msec: milliseconds between two button press events
*
* Sets the maximum time between two button press events, used to
* verify whether it's a double click event or not.
*
* Since: 0.4
*
* Deprecated: 1.4: Use #ClutterSettings:double-click-time instead
*/
void
clutter_backend_set_double_click_time (ClutterBackend *backend,
guint msec)
{
ClutterSettings *settings = clutter_settings_get_default ();
g_object_set (settings, "double-click-time", msec, NULL);
}
/**
* clutter_backend_get_double_click_time:
* @backend: a #ClutterBackend
*
* Gets the maximum time between two button press events, as set
* by clutter_backend_set_double_click_time().
*
* Return value: a time in milliseconds
*
* Since: 0.4
*
* Deprecated: 1.4: Use #ClutterSettings:double-click-time instead
*/
guint
clutter_backend_get_double_click_time (ClutterBackend *backend)
{
ClutterSettings *settings = clutter_settings_get_default ();
gint retval;
g_object_get (settings, "double-click-time", &retval, NULL);
return retval;
}
/**
* clutter_backend_set_double_click_distance:
* @backend: a #ClutterBackend
* @distance: a distance, in pixels
*
* Sets the maximum distance used to verify a double click event.
*
* Since: 0.4
*
* Deprecated: 1.4: Use #ClutterSettings:double-click-distance instead
*/
void
clutter_backend_set_double_click_distance (ClutterBackend *backend,
guint distance)
{
ClutterSettings *settings = clutter_settings_get_default ();
g_object_set (settings, "double-click-distance", distance, NULL);
}
/**
* clutter_backend_get_double_click_distance:
* @backend: a #ClutterBackend
*
* Retrieves the distance used to verify a double click event
*
* Return value: a distance, in pixels.
*
* Since: 0.4
*
* Deprecated: 1.4: Use #ClutterSettings:double-click-distance instead
*/
guint
clutter_backend_get_double_click_distance (ClutterBackend *backend)
{
ClutterSettings *settings = clutter_settings_get_default ();
gint retval;
g_object_get (settings, "double-click-distance", &retval, NULL);
return retval;
}
/**
* clutter_backend_set_resolution:
* @backend: a #ClutterBackend
* @dpi: the resolution in "dots per inch" (Physical inches aren't
* actually involved; the terminology is conventional).
*
* Sets the resolution for font handling on the screen. This is a
* scale factor between points specified in a #PangoFontDescription
* and cairo units. The default value is 96, meaning that a 10 point
* font will be 13 units high. (10 * 96. / 72. = 13.3).
*
* Applications should never need to call this function.
*
* Since: 0.4
*
* Deprecated: Use #ClutterSettings:font-dpi instead
*/
void
clutter_backend_set_resolution (ClutterBackend *backend,
gdouble dpi)
{
ClutterSettings *settings;
gint resolution;
g_return_if_fail (CLUTTER_IS_BACKEND (backend));
if (dpi < 0)
resolution = -1;
else
resolution = dpi * 1024;
settings = clutter_settings_get_default ();
g_object_set (settings, "font-dpi", resolution, NULL);
}
/**
* clutter_backend_get_resolution:
* @backend: a #ClutterBackend
*
* Gets the resolution for font handling on the screen.
*
* The resolution is a scale factor between points specified in a
* #PangoFontDescription and cairo units. The default value is 96.0,
* meaning that a 10 point font will be 13 units
* high (10 * 96. / 72. = 13.3).
*
* Clutter will set the resolution using the current backend when
* initializing; the resolution is also stored in the
* #ClutterSettings:font-dpi property.
*
* Return value: the current resolution, or -1 if no resolution
* has been set.
*
* Since: 0.4
*/
gdouble
clutter_backend_get_resolution (ClutterBackend *backend)
{
ClutterSettings *settings;
gint resolution;
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), -1.0);
settings = clutter_settings_get_default ();
g_object_get (settings, "font-dpi", &resolution, NULL);
return resolution / 1024.0;
}
/**
* clutter_backend_set_font_options:
* @backend: a #ClutterBackend
* @options: Cairo font options for the backend, or %NULL
*
* Sets the new font options for @backend. The #ClutterBackend will
* copy the #cairo_font_options_t.
*
* If @options is %NULL, the first following call to
* clutter_backend_get_font_options() will return the default font
* options for @backend.
*
* This function is intended for actors creating a Pango layout
* using the PangoCairo API.
*
* Since: 0.8
*/
void
clutter_backend_set_font_options (ClutterBackend *backend,
const cairo_font_options_t *options)
{
ClutterBackendPrivate *priv;
g_return_if_fail (CLUTTER_IS_BACKEND (backend));
priv = backend->priv;
if (priv->font_options != options)
{
if (priv->font_options)
cairo_font_options_destroy (priv->font_options);
if (options)
priv->font_options = cairo_font_options_copy (options);
else
priv->font_options = NULL;
g_signal_emit (backend, backend_signals[FONT_CHANGED], 0);
}
}
/**
* clutter_backend_get_font_options:
* @backend: a #ClutterBackend
*
* Retrieves the font options for @backend.
*
* Return value: (transfer none): the font options of the #ClutterBackend.
* The returned #cairo_font_options_t is owned by the backend and should
* not be modified or freed
*
* Since: 0.8
*/
const cairo_font_options_t *
clutter_backend_get_font_options (ClutterBackend *backend)
{
ClutterBackendPrivate *priv;
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), NULL);
priv = backend->priv;
if (G_LIKELY (priv->font_options))
return priv->font_options;
priv->font_options = cairo_font_options_create ();
cairo_font_options_set_hint_style (priv->font_options,
CAIRO_HINT_STYLE_NONE);
cairo_font_options_set_subpixel_order (priv->font_options,
CAIRO_SUBPIXEL_ORDER_DEFAULT);
cairo_font_options_set_antialias (priv->font_options,
CAIRO_ANTIALIAS_DEFAULT);
g_signal_emit (backend, backend_signals[FONT_CHANGED], 0);
return priv->font_options;
}
/**
* clutter_backend_set_font_name:
* @backend: a #ClutterBackend
* @font_name: the name of the font
*
* Sets the default font to be used by Clutter. The @font_name string
* must either be %NULL, which means that the font name from the
* default #ClutterBackend will be used; or be something that can
* be parsed by the pango_font_description_from_string() function.
*
* Since: 1.0
*
* Deprecated: 1.4: Use #ClutterSettings:font-name instead
*/
void
clutter_backend_set_font_name (ClutterBackend *backend,
const gchar *font_name)
{
ClutterSettings *settings = clutter_settings_get_default ();
g_object_set (settings, "font-name", font_name, NULL);
}
/**
* clutter_backend_get_font_name:
* @backend: a #ClutterBackend
*
* Retrieves the default font name as set by
* clutter_backend_set_font_name().
*
* Return value: the font name for the backend. The returned string is
* owned by the #ClutterBackend and should never be modified or freed
*
* Since: 1.0
*
* Deprecated: 1.4: Use #ClutterSettings:font-name instead
*/
const gchar *
clutter_backend_get_font_name (ClutterBackend *backend)
{
ClutterBackendPrivate *priv;
ClutterSettings *settings;
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), NULL);
priv = backend->priv;
settings = clutter_settings_get_default ();
/* XXX yuck. but we return a const pointer, so we need to
* store it in the backend
*/
g_free (priv->font_name);
g_object_get (settings, "font-name", &priv->font_name, NULL);
return priv->font_name;
}
gint32
_clutter_backend_get_units_serial (ClutterBackend *backend)
{
return backend->priv->units_serial;
}
gboolean
_clutter_backend_translate_event (ClutterBackend *backend,
gpointer native,
ClutterEvent *event)
{
return CLUTTER_BACKEND_GET_CLASS (backend)->translate_event (backend,
native,
event);
}
void
_clutter_backend_add_event_translator (ClutterBackend *backend,
ClutterEventTranslator *translator)
{
ClutterBackendPrivate *priv = backend->priv;
if (g_list_find (priv->event_translators, translator) != NULL)
return;
priv->event_translators =
g_list_prepend (priv->event_translators, translator);
}
void
_clutter_backend_remove_event_translator (ClutterBackend *backend,
ClutterEventTranslator *translator)
{
ClutterBackendPrivate *priv = backend->priv;
if (g_list_find (priv->event_translators, translator) == NULL)
return;
priv->event_translators =
g_list_remove (priv->event_translators, translator);
}
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