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mutter/clutter/clutter/clutter-backend.c
Jonas Ådahl d62d780a95 Remove cogl-1.0 vs cogl-2.0 vs cogl experimental API split 
Mutter (and libmutter users) are the only users of this version of
cogl, and will more or less only use the cogl-1.0, cogl-2.0 and cogl
experimental API variants, and having the possibility of having
different API versions of the same API depending on what file includes
it is error prone and confusing. Lets just remove the possibility of
having different versions of the same API.

https://bugzilla.gnome.org/show_bug.cgi?id=768977
2016-07-20 14:23:48 +08:00

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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 "clutter-build-config.h"
#endif
#define CLUTTER_ENABLE_EXPERIMENTAL_API
#include "clutter-backend-private.h"
#include "clutter-debug.h"
#include "clutter-event-private.h"
#include "clutter-marshal.h"
#include "clutter-mutter.h"
#include "clutter-private.h"
#include "clutter-stage-manager-private.h"
#include "clutter-stage-private.h"
#include "clutter-stage-window.h"
#include "clutter-version.h"
#include "clutter-device-manager-private.h"
#define CLUTTER_DISABLE_DEPRECATION_WARNINGS
#include "deprecated/clutter-backend.h"
#ifdef CLUTTER_HAS_WAYLAND_COMPOSITOR_SUPPORT
#include "wayland/clutter-wayland-compositor.h"
#endif
#include <cogl/cogl.h>
#ifdef CLUTTER_INPUT_X11
#include "x11/clutter-backend-x11.h"
#endif
#ifdef CLUTTER_INPUT_EVDEV
#include "evdev/clutter-device-manager-evdev.h"
#endif
#ifdef CLUTTER_WINDOWING_EGL
#include "egl/clutter-backend-eglnative.h"
#endif
#ifdef CLUTTER_HAS_WAYLAND_COMPOSITOR_SUPPORT
#include <cogl/cogl-wayland-server.h>
#include <wayland-server.h>
#include "wayland/clutter-wayland-compositor.h"
#endif
#define DEFAULT_FONT_NAME "Sans 10"
enum
{
RESOLUTION_CHANGED,
FONT_CHANGED,
SETTINGS_CHANGED,
LAST_SIGNAL
};
G_DEFINE_ABSTRACT_TYPE (ClutterBackend, clutter_backend, G_TYPE_OBJECT)
static guint backend_signals[LAST_SIGNAL] = { 0, };
/* Global for being able to specify a compositor side wayland display
* pointer before clutter initialization */
#ifdef CLUTTER_HAS_WAYLAND_COMPOSITOR_SUPPORT
static struct wl_display *_wayland_compositor_display;
#endif
static void
clutter_backend_dispose (GObject *gobject)
{
ClutterBackend *backend = CLUTTER_BACKEND (gobject);
/* clear the events still in the queue of the main context */
_clutter_clear_events_queue ();
/* remove all event translators */
g_clear_pointer (&backend->event_translators, g_list_free);
g_clear_pointer (&backend->dummy_onscreen, cogl_object_unref);
G_OBJECT_CLASS (clutter_backend_parent_class)->dispose (gobject);
}
static void
clutter_backend_finalize (GObject *gobject)
{
ClutterBackend *backend = CLUTTER_BACKEND (gobject);
g_source_destroy (backend->cogl_source);
g_free (backend->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 = dpi * ((gdouble) pango_size / PANGO_SCALE) / 72.0f;
/* 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)
{
ClutterMainContext *context;
ClutterSettings *settings;
gdouble resolution;
gint dpi;
settings = clutter_settings_get_default ();
g_object_get (settings, "font-dpi", &dpi, NULL);
if (dpi < 0)
resolution = 96.0;
else
resolution = dpi / 1024.0;
context = _clutter_context_get_default ();
if (context->font_map != NULL)
cogl_pango_font_map_set_resolution (context->font_map, resolution);
backend->units_per_em = get_units_per_em (backend, NULL);
backend->units_serial += 1;
CLUTTER_NOTE (BACKEND, "Units per em: %.2f", backend->units_per_em);
}
static void
clutter_backend_real_font_changed (ClutterBackend *backend)
{
backend->units_per_em = get_units_per_em (backend, NULL);
backend->units_serial += 1;
CLUTTER_NOTE (BACKEND, "Units per em: %.2f", backend->units_per_em);
}
static gboolean
clutter_backend_do_real_create_context (ClutterBackend *backend,
CoglDriver driver_id,
GError **error)
{
ClutterBackendClass *klass;
CoglSwapChain *swap_chain;
GError *internal_error;
klass = CLUTTER_BACKEND_GET_CLASS (backend);
swap_chain = NULL;
internal_error = NULL;
CLUTTER_NOTE (BACKEND, "Creating Cogl renderer");
backend->cogl_renderer = klass->get_renderer (backend, &internal_error);
if (backend->cogl_renderer == NULL)
goto error;
CLUTTER_NOTE (BACKEND, "Connecting the renderer");
cogl_renderer_set_driver (backend->cogl_renderer, driver_id);
if (!cogl_renderer_connect (backend->cogl_renderer, &internal_error))
goto error;
CLUTTER_NOTE (BACKEND, "Creating Cogl swap chain");
swap_chain = cogl_swap_chain_new ();
CLUTTER_NOTE (BACKEND, "Creating Cogl display");
if (klass->get_display != NULL)
{
backend->cogl_display = klass->get_display (backend,
backend->cogl_renderer,
swap_chain,
&internal_error);
}
else
{
CoglOnscreenTemplate *tmpl;
gboolean res;
tmpl = cogl_onscreen_template_new (swap_chain);
/* XXX: I have some doubts that this is a good design.
*
* Conceptually should we be able to check an onscreen_template
* without more details about the CoglDisplay configuration?
*/
res = cogl_renderer_check_onscreen_template (backend->cogl_renderer,
tmpl,
&internal_error);
if (!res)
goto error;
backend->cogl_display = cogl_display_new (backend->cogl_renderer, tmpl);
/* the display owns the template */
cogl_object_unref (tmpl);
}
if (backend->cogl_display == NULL)
goto error;
#ifdef CLUTTER_HAS_WAYLAND_COMPOSITOR_SUPPORT
cogl_wayland_display_set_compositor_display (backend->cogl_display,
_wayland_compositor_display);
#endif
CLUTTER_NOTE (BACKEND, "Setting up the display");
if (!cogl_display_setup (backend->cogl_display, &internal_error))
goto error;
CLUTTER_NOTE (BACKEND, "Creating the Cogl context");
backend->cogl_context = cogl_context_new (backend->cogl_display, &internal_error);
if (backend->cogl_context == NULL)
goto error;
/* the display owns the renderer and the swap chain */
cogl_object_unref (backend->cogl_renderer);
cogl_object_unref (swap_chain);
return TRUE;
error:
if (backend->cogl_display != NULL)
{
cogl_object_unref (backend->cogl_display);
backend->cogl_display = NULL;
}
if (backend->cogl_renderer != NULL)
{
cogl_object_unref (backend->cogl_renderer);
backend->cogl_renderer = NULL;
}
if (swap_chain != NULL)
cogl_object_unref (swap_chain);
return FALSE;
}
static const struct {
const char *driver_name;
const char *driver_desc;
CoglDriver driver_id;
} all_known_drivers[] = {
{ "gl3", "OpenGL 3.2 core profile", COGL_DRIVER_GL3 },
{ "gl", "OpenGL legacy profile", COGL_DRIVER_GL },
{ "gles2", "OpenGL ES 2.0", COGL_DRIVER_GLES2 },
{ "any", "Default Cogl driver", COGL_DRIVER_ANY },
};
static const char *allowed_drivers;
static gboolean
clutter_backend_real_create_context (ClutterBackend *backend,
GError **error)
{
GError *internal_error = NULL;
const char *drivers_list;
char **known_drivers;
gboolean allow_any;
int i;
if (backend->cogl_context != NULL)
return TRUE;
if (allowed_drivers == NULL)
allowed_drivers = CLUTTER_DRIVERS;
allow_any = strstr (allowed_drivers, "*") != NULL;
drivers_list = g_getenv ("CLUTTER_DRIVER");
if (drivers_list == NULL)
drivers_list = allowed_drivers;
known_drivers = g_strsplit (drivers_list, ",", 0);
for (i = 0; backend->cogl_context == NULL && known_drivers[i] != NULL; i++)
{
const char *driver_name = known_drivers[i];
gboolean is_any = g_str_equal (driver_name, "*");
int j;
for (j = 0; j < G_N_ELEMENTS (all_known_drivers); j++)
{
if (!allow_any && !is_any && !strstr (driver_name, all_known_drivers[j].driver_name))
continue;
if ((allow_any && is_any) ||
(is_any && strstr (allowed_drivers, all_known_drivers[j].driver_name)) ||
g_str_equal (all_known_drivers[j].driver_name, driver_name))
{
CLUTTER_NOTE (BACKEND, "Checking for the %s driver", all_known_drivers[j].driver_desc);
if (clutter_backend_do_real_create_context (backend, all_known_drivers[j].driver_id, &internal_error))
break;
if (internal_error)
{
CLUTTER_NOTE (BACKEND, "Unable to use the %s driver: %s",
all_known_drivers[j].driver_desc,
internal_error->message);
g_clear_error (&internal_error);
}
}
}
}
g_strfreev (known_drivers);
if (backend->cogl_context == NULL)
{
if (internal_error != NULL)
g_propagate_error (error, internal_error);
else
g_set_error_literal (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
_("Unable to initialize the Clutter backend: no available drivers found."));
return FALSE;
}
backend->cogl_source = cogl_glib_source_new (backend->cogl_context, G_PRIORITY_DEFAULT);
g_source_attach (backend->cogl_source, NULL);
return TRUE;
}
static ClutterFeatureFlags
clutter_backend_real_get_features (ClutterBackend *backend)
{
ClutterFeatureFlags flags = 0;
if (cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_MULTIPLE_ONSCREEN))
{
CLUTTER_NOTE (BACKEND, "Cogl supports multiple onscreen framebuffers");
flags |= CLUTTER_FEATURE_STAGE_MULTIPLE;
}
else
{
CLUTTER_NOTE (BACKEND, "Cogl only supports one onscreen framebuffer");
flags |= CLUTTER_FEATURE_STAGE_STATIC;
}
if (cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_THROTTLE))
{
CLUTTER_NOTE (BACKEND, "Cogl supports swap buffers throttling");
flags |= CLUTTER_FEATURE_SYNC_TO_VBLANK;
}
else
CLUTTER_NOTE (BACKEND, "Cogl doesn't support swap buffers throttling");
if (cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_BUFFERS_EVENT))
{
CLUTTER_NOTE (BACKEND, "Cogl supports swap buffers complete events");
flags |= CLUTTER_FEATURE_SWAP_EVENTS;
}
return flags;
}
static const char *allowed_backends;
static ClutterBackend * (* custom_backend_func) (void);
static const struct {
const char *name;
ClutterBackend * (* create_backend) (void);
} available_backends[] = {
#ifdef CLUTTER_WINDOWING_X11
{ CLUTTER_WINDOWING_X11, clutter_backend_x11_new },
#endif
#ifdef CLUTTER_WINDOWING_EGL
{ CLUTTER_WINDOWING_EGL, clutter_backend_egl_native_new },
#endif
{ NULL, NULL },
};
void
clutter_set_custom_backend_func (ClutterBackend *(* func) (void))
{
custom_backend_func = func;
}
ClutterBackend *
_clutter_create_backend (void)
{
const char *backends_list;
ClutterBackend *retval;
gboolean allow_any;
char **backends;
int i;
if (custom_backend_func)
{
retval = custom_backend_func ();
if (!retval)
g_error ("Failed to create custom backend.");
return retval;
}
if (allowed_backends == NULL)
allowed_backends = "*";
allow_any = strstr (allowed_backends, "*") != NULL;
backends_list = g_getenv ("CLUTTER_BACKEND");
if (backends_list == NULL)
backends_list = allowed_backends;
backends = g_strsplit (backends_list, ",", 0);
retval = NULL;
for (i = 0; retval == NULL && backends[i] != NULL; i++)
{
const char *backend = backends[i];
gboolean is_any = g_str_equal (backend, "*");
int j;
for (j = 0; available_backends[j].name != NULL; j++)
{
if ((is_any && allow_any) ||
(is_any && strstr (allowed_backends, available_backends[j].name)) ||
g_str_equal (backend, available_backends[j].name))
{
retval = available_backends[j].create_backend ();
if (retval != NULL)
break;
}
}
}
g_strfreev (backends);
if (retval == NULL)
g_error ("No default Clutter backend found.");
return retval;
}
static void
clutter_backend_real_init_events (ClutterBackend *backend)
{
const char *input_backend = NULL;
input_backend = g_getenv ("CLUTTER_INPUT_BACKEND");
if (input_backend != NULL)
input_backend = g_intern_string (input_backend);
#ifdef CLUTTER_INPUT_X11
if (clutter_check_windowing_backend (CLUTTER_WINDOWING_X11) &&
(input_backend == NULL || input_backend == I_(CLUTTER_INPUT_X11)))
{
_clutter_backend_x11_events_init (backend);
}
else
#endif
#ifdef CLUTTER_INPUT_EVDEV
/* Evdev can be used regardless of the windowing system */
if ((input_backend != NULL && strcmp (input_backend, CLUTTER_INPUT_EVDEV) == 0)
#ifdef CLUTTER_WINDOWING_EGL
/* but we do want to always use it for EGL native */
|| clutter_check_windowing_backend (CLUTTER_WINDOWING_EGL)
#endif
)
{
_clutter_events_evdev_init (backend);
}
else
#endif
if (input_backend != NULL)
{
if (input_backend != I_(CLUTTER_INPUT_NULL))
g_error ("Unrecognized input backend '%s'", input_backend);
}
else
g_error ("Unknown input backend");
}
static ClutterDeviceManager *
clutter_backend_real_get_device_manager (ClutterBackend *backend)
{
if (G_UNLIKELY (backend->device_manager == NULL))
{
g_critical ("No device manager available, expect broken input");
return NULL;
}
return backend->device_manager;
}
static gboolean
clutter_backend_real_translate_event (ClutterBackend *backend,
gpointer native,
ClutterEvent *event)
{
GList *l;
for (l = backend->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;
/**
* ClutterBackend::resolution-changed:
* @backend: the #ClutterBackend that emitted the signal
*
* The ::resolution-changed signal is emitted each time the font
* resolutions has been changed through #ClutterSettings.
*
* Since: 1.0
*/
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);
/**
* ClutterBackend::font-changed:
* @backend: the #ClutterBackend that emitted the signal
*
* The ::font-changed signal is emitted each time the font options
* have been changed through #ClutterSettings.
*
* Since: 1.0
*/
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);
/**
* ClutterBackend::settings-changed:
* @backend: the #ClutterBackend that emitted the signal
*
* The ::settings-changed signal is emitted each time the #ClutterSettings
* properties have been changed.
*
* Since: 1.4
*/
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->init_events = clutter_backend_real_init_events;
klass->get_device_manager = clutter_backend_real_get_device_manager;
klass->translate_event = clutter_backend_real_translate_event;
klass->create_context = clutter_backend_real_create_context;
klass->get_features = clutter_backend_real_get_features;
}
static void
clutter_backend_init (ClutterBackend *self)
{
self->units_per_em = -1.0;
self->units_serial = 1;
self->dummy_onscreen = COGL_INVALID_HANDLE;
}
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;
ClutterStageWindow *stage_window;
g_assert (CLUTTER_IS_BACKEND (backend));
g_assert (CLUTTER_IS_STAGE (wrapper));
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));
return stage_window;
}
gboolean
_clutter_backend_create_context (ClutterBackend *backend,
GError **error)
{
ClutterBackendClass *klass;
klass = CLUTTER_BACKEND_GET_CLASS (backend);
return klass->create_context (backend, error);
}
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);
klass->init_events (backend);
}
gfloat
_clutter_backend_get_units_per_em (ClutterBackend *backend,
PangoFontDescription *font_desc)
{
/* recompute for the font description, but do not cache the result */
if (font_desc != NULL)
return get_units_per_em (backend, font_desc);
if (backend->units_per_em < 0)
backend->units_per_em = get_units_per_em (backend, NULL);
return backend->units_per_em;
}
void
_clutter_backend_copy_event_data (ClutterBackend *backend,
const ClutterEvent *src,
ClutterEvent *dest)
{
ClutterEventExtenderInterface *iface;
ClutterBackendClass *klass;
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (CLUTTER_IS_EVENT_EXTENDER (backend->device_manager))
{
iface = CLUTTER_EVENT_EXTENDER_GET_IFACE (backend->device_manager);
iface->copy_event_data (CLUTTER_EVENT_EXTENDER (backend->device_manager),
src, dest);
}
else if (klass->copy_event_data != NULL)
klass->copy_event_data (backend, src, dest);
}
void
_clutter_backend_free_event_data (ClutterBackend *backend,
ClutterEvent *event)
{
ClutterEventExtenderInterface *iface;
ClutterBackendClass *klass;
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (CLUTTER_IS_EVENT_EXTENDER (backend->device_manager))
{
iface = CLUTTER_EVENT_EXTENDER_GET_IFACE (backend->device_manager);
iface->free_event_data (CLUTTER_EVENT_EXTENDER (backend->device_manager),
event);
}
else 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: 1.4: 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);
if (resolution < 0)
return 96.0;
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)
{
g_return_if_fail (CLUTTER_IS_BACKEND (backend));
if (backend->font_options != options)
{
if (backend->font_options)
cairo_font_options_destroy (backend->font_options);
if (options)
backend->font_options = cairo_font_options_copy (options);
else
backend->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)
{
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), NULL);
if (G_LIKELY (backend->font_options))
return backend->font_options;
backend->font_options = cairo_font_options_create ();
cairo_font_options_set_hint_style (backend->font_options, CAIRO_HINT_STYLE_NONE);
cairo_font_options_set_subpixel_order (backend->font_options, CAIRO_SUBPIXEL_ORDER_DEFAULT);
cairo_font_options_set_antialias (backend->font_options, CAIRO_ANTIALIAS_DEFAULT);
g_signal_emit (backend, backend_signals[FONT_CHANGED], 0);
return backend->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)
{
ClutterSettings *settings;
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), NULL);
settings = clutter_settings_get_default ();
/* XXX yuck. but we return a const pointer, so we need to
* store it in the backend
*/
g_free (backend->font_name);
g_object_get (settings, "font-name", &backend->font_name, NULL);
return backend->font_name;
}
gint32
_clutter_backend_get_units_serial (ClutterBackend *backend)
{
return backend->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)
{
if (g_list_find (backend->event_translators, translator) != NULL)
return;
backend->event_translators =
g_list_prepend (backend->event_translators, translator);
}
void
_clutter_backend_remove_event_translator (ClutterBackend *backend,
ClutterEventTranslator *translator)
{
if (g_list_find (backend->event_translators, translator) == NULL)
return;
backend->event_translators =
g_list_remove (backend->event_translators, translator);
}
/**
* clutter_backend_get_cogl_context: (skip)
* @backend: a #ClutterBackend
*
* Retrieves the #CoglContext associated with the given clutter
* @backend. A #CoglContext is required when using some of the
* experimental 2.0 Cogl API.
*
* Since CoglContext is itself experimental API this API should
* be considered experimental too.
*
* This API is not yet supported on OSX because OSX still
* uses the stub Cogl winsys and the Clutter backend doesn't
* explicitly create a CoglContext.
*
* Return value: (transfer none): The #CoglContext associated with @backend.
*
* Since: 1.8
* Stability: unstable
*/
CoglContext *
clutter_backend_get_cogl_context (ClutterBackend *backend)
{
return backend->cogl_context;
}
#ifdef CLUTTER_HAS_WAYLAND_COMPOSITOR_SUPPORT
/**
* clutter_wayland_set_compositor_display:
* @display: A compositor side struct wl_display pointer
*
* This informs Clutter of your compositor side Wayland display
* object. This must be called before calling clutter_init().
*
* Since: 1.8
* Stability: unstable
*/
void
clutter_wayland_set_compositor_display (void *display)
{
if (_clutter_context_is_initialized ())
{
g_warning ("%s() can only be used before calling clutter_init()",
G_STRFUNC);
return;
}
_wayland_compositor_display = display;
}
#endif
/**
* clutter_set_windowing_backend:
* @backend_type: a comma separated list of windowing backends
*
* Restricts Clutter to only use the specified backend or list of backends.
*
* You can use one of the `CLUTTER_WINDOWING_*` symbols, e.g.
*
* |[<!-- language="C" -->
* clutter_set_windowing_backend (CLUTTER_WINDOWING_X11);
* ]|
*
* Will force Clutter to use the X11 windowing and input backend, and terminate
* if the X11 backend could not be initialized successfully.
*
* Since Clutter 1.26, you can also use a comma-separated list of windowing
* system backends to provide a fallback in case backends are not available or
* enabled, e.g.:
*
* |[<!-- language="C" -->
* clutter_set_windowing_backend ("gdk,wayland,x11");
* ]|
*
* Will make Clutter test for the GDK, Wayland, and X11 backends in that order.
*
* You can use the `*` special value to ask Clutter to use the internally
* defined list of backends. For instance:
*
* |[<!-- language="C" -->
* clutter_set_windowing_backend ("x11,wayland,*");
* ]|
*
* Will make Clutter test the X11 and Wayland backends, and then fall back
* to the internal list of available backends.
*
* This function must be called before the first API call to Clutter, including
* clutter_get_option_context()
*
* Since: 1.16
*/
void
clutter_set_windowing_backend (const char *backend_type)
{
g_return_if_fail (backend_type != NULL);
allowed_backends = g_strdup (backend_type);
}
void
clutter_try_set_windowing_backend (const char *backend_type)
{
if (allowed_backends == NULL)
clutter_set_windowing_backend (backend_type);
}
PangoDirection
_clutter_backend_get_keymap_direction (ClutterBackend *backend)
{
ClutterBackendClass *klass;
klass = CLUTTER_BACKEND_GET_CLASS (backend);
if (klass->get_keymap_direction != NULL)
return klass->get_keymap_direction (backend);
return PANGO_DIRECTION_NEUTRAL;
}
void
_clutter_backend_reset_cogl_framebuffer (ClutterBackend *backend)
{
if (backend->dummy_onscreen == COGL_INVALID_HANDLE)
{
CoglError *internal_error = NULL;
backend->dummy_onscreen = cogl_onscreen_new (backend->cogl_context, 1, 1);
if (!cogl_framebuffer_allocate (COGL_FRAMEBUFFER (backend->dummy_onscreen),
&internal_error))
{
g_critical ("Unable to create dummy onscreen: %s", internal_error->message);
cogl_error_free (internal_error);
return;
}
}
cogl_set_framebuffer (COGL_FRAMEBUFFER (backend->dummy_onscreen));
}
void
clutter_set_allowed_drivers (const char *drivers)
{
if (_clutter_context_is_initialized ())
{
g_warning ("Clutter has already been initialized.\n");
return;
}
allowed_drivers = g_strdup (drivers);
}
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