mirror of
https://github.com/brl/mutter.git
synced 2024-11-10 07:56:14 -05:00
532b563439
This gives us a way to clearly track the internal Cogl API that Clutter depends on. The aim is to split Cogl out from Clutter into a standalone 3D graphics API and eventually we want to get rid of any private interfaces for Clutter so its useful to have a handle on that task. Actually it's not as bad as I was expecting though.
944 lines
25 KiB
C
944 lines
25 KiB
C
/*
|
|
* 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
|
|
*/
|
|
G_CONST_RETURN 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);
|
|
}
|