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mutter/clutter/gdk/clutter-backend-gdk.c
Emmanuele Bassi adb6ffbd0e backend: Unify the event initialization 
Input backends are, in some cases, independent from the windowing system
backends; we can initialize input handling using a model similar to what
we use for windowing backends, including an environment variable and
compile-/run-time checks.

This model allows us to remove the backend-specific init_events(), and
use a generic implementation directly inside the base ClutterBackend
class, thus further reducing the backend-specific code that every
platform has to implement.

This requires some minor surgery to every single backend, to make sure
that the function exposed to initialize the event loop is similar and
performs roughly the same operations.
2011-11-10 14:42:40 +00:00

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/* Clutter.
* An OpenGL based 'interactive canvas' library.
* Authored By Matthew Allum <mallum@openedhand.com>
* Copyright (C) 2006-2007 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/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib/gi18n-lib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <gdk/gdk.h>
#include <cogl/cogl.h>
#include <cogl/cogl-xlib.h>
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif
#ifdef GDK_WINDOWING_WIN32
#include <gdk/gdkwin32.h>
#endif
#include "clutter-backend-gdk.h"
#include "clutter-device-manager-gdk.h"
#include "clutter-settings-gdk.h"
#include "clutter-stage-gdk.h"
#include "clutter-gdk.h"
#include "clutter-backend.h"
#include "clutter-debug.h"
#include "clutter-device-manager-private.h"
#include "clutter-event-private.h"
#include "clutter-main.h"
#include "clutter-private.h"
#define clutter_backend_gdk_get_type _clutter_backend_gdk_get_type
G_DEFINE_TYPE (ClutterBackendGdk, clutter_backend_gdk, CLUTTER_TYPE_BACKEND_COGL);
/* global for pre init setup calls */
static GdkDisplay *_foreign_dpy = NULL;
static gboolean disable_event_retrieval = FALSE;
static void
clutter_backend_gdk_init_settings (ClutterBackendGdk *backend_gdk)
{
ClutterSettings *settings = clutter_settings_get_default ();
int i;
for (i = 0; i < G_N_ELEMENTS (_clutter_settings_map); i++)
{
GValue val = G_VALUE_INIT;
g_value_init (&val, CLUTTER_SETTING_TYPE(i));
gdk_screen_get_setting (backend_gdk->screen,
CLUTTER_SETTING_GDK_NAME(i),
&val);
g_object_set_property (G_OBJECT (settings),
CLUTTER_SETTING_PROPERTY(i),
&val);
g_value_unset (&val);
}
}
void
_clutter_backend_gdk_update_setting (ClutterBackendGdk *backend_gdk,
const gchar *setting_name)
{
ClutterSettings *settings = clutter_settings_get_default ();
int i;
for (i = 0; i < G_N_ELEMENTS (_clutter_settings_map); i++)
{
if (g_strcmp0 (CLUTTER_SETTING_GDK_NAME (i), setting_name) == 0)
{
GValue val = G_VALUE_INIT;
g_value_init (&val, CLUTTER_SETTING_TYPE (i));
gdk_screen_get_setting (backend_gdk->screen,
CLUTTER_SETTING_GDK_NAME (i),
&val);
g_object_set_property (G_OBJECT (settings),
CLUTTER_SETTING_PROPERTY (i),
&val);
g_value_unset (&val);
break;
}
}
}
static GdkFilterReturn
cogl_gdk_filter (GdkXEvent *xevent,
GdkEvent *event,
gpointer data)
{
#ifdef GDK_WINDOWING_X11
CoglFilterReturn ret;
ret = cogl_xlib_handle_event ((XEvent*)xevent);
switch (ret)
{
case COGL_FILTER_REMOVE:
return GDK_FILTER_REMOVE;
case COGL_FILTER_CONTINUE:
default:
return GDK_FILTER_CONTINUE;
}
#endif
}
static gboolean
_clutter_backend_gdk_post_parse (ClutterBackend *backend,
GError **error)
{
ClutterBackendGdk *backend_gdk = CLUTTER_BACKEND_GDK (backend);
if (_foreign_dpy != NULL)
backend_gdk->display = _foreign_dpy;
/* Init Gdk, if outside code did not already */
if (!gdk_init_check (NULL, NULL))
return FALSE;
/*
* Only open connection if not already set by prior call to
* clutter_gdk_set_display()
*/
if (backend_gdk->display == NULL)
backend_gdk->display = g_object_ref (gdk_display_get_default ());
g_assert (backend_gdk->display != NULL);
#ifdef GDK_WINDOWING_X11
if (GDK_IS_X11_DISPLAY (backend_gdk->display))
{
/* Cogl needs to know the Xlib display connection for
CoglTexturePixmapX11 */
cogl_xlib_set_display (gdk_x11_display_get_xdisplay (backend_gdk->display));
}
#endif
backend_gdk->screen = gdk_display_get_default_screen (backend_gdk->display);
/* add event filter for Cogl events */
gdk_window_add_filter (NULL, cogl_gdk_filter, NULL);
clutter_backend_gdk_init_settings (backend_gdk);
CLUTTER_NOTE (BACKEND,
"Gdk Display '%s' opened",
gdk_display_get_name (backend_gdk->display));
return CLUTTER_BACKEND_CLASS (clutter_backend_gdk_parent_class)->post_parse (backend,
error);
}
static void
gdk_event_handler (GdkEvent *event,
gpointer user_data)
{
clutter_gdk_handle_event (event);
}
void
_clutter_backend_gdk_events_init (ClutterBackend *backend)
{
CLUTTER_NOTE (EVENT, "initialising the event loop");
if (!disable_event_retrieval)
gdk_event_handler_set (gdk_event_handler, NULL, NULL);
}
static void
clutter_backend_gdk_finalize (GObject *gobject)
{
ClutterBackendGdk *backend_gdk = CLUTTER_BACKEND_GDK (gobject);
gdk_window_remove_filter (NULL, cogl_gdk_filter, NULL);
g_object_unref (backend_gdk->display);
G_OBJECT_CLASS (clutter_backend_gdk_parent_class)->finalize (gobject);
}
static void
clutter_backend_gdk_dispose (GObject *gobject)
{
G_OBJECT_CLASS (clutter_backend_gdk_parent_class)->dispose (gobject);
}
static ClutterFeatureFlags
clutter_backend_gdk_get_features (ClutterBackend *backend)
{
ClutterFeatureFlags flags = CLUTTER_FEATURE_STAGE_USER_RESIZE | CLUTTER_FEATURE_STAGE_CURSOR;
flags |= CLUTTER_BACKEND_CLASS (clutter_backend_gdk_parent_class)->get_features (backend);
return flags;
}
static void
clutter_backend_gdk_copy_event_data (ClutterBackend *backend,
const ClutterEvent *src,
ClutterEvent *dest)
{
GdkEvent *gdk_event;
gdk_event = _clutter_event_get_platform_data (src);
if (gdk_event != NULL)
_clutter_event_set_platform_data (dest, gdk_event_copy (gdk_event));
}
static void
clutter_backend_gdk_free_event_data (ClutterBackend *backend,
ClutterEvent *event)
{
GdkEvent *gdk_event;
gdk_event = _clutter_event_get_platform_data (event);
if (gdk_event != NULL)
gdk_event_free (gdk_event);
}
static ClutterDeviceManager *
clutter_backend_gdk_get_device_manager (ClutterBackend *backend)
{
ClutterBackendGdk *backend_gdk = CLUTTER_BACKEND_GDK (backend);
if (G_UNLIKELY (backend_gdk->device_manager == NULL))
{
backend_gdk->device_manager = g_object_new (CLUTTER_TYPE_DEVICE_MANAGER_GDK,
"backend", backend_gdk,
"gdk-display", backend_gdk->display,
NULL);
}
return backend_gdk->device_manager;
}
static gboolean
clutter_backend_gdk_create_context (ClutterBackend *backend,
GError **error)
{
ClutterBackendGdk *backend_gdk = CLUTTER_BACKEND_GDK (backend);
CoglSwapChain *swap_chain = NULL;
CoglOnscreenTemplate *onscreen_template = NULL;
GdkVisual *rgba_visual = NULL;
if (backend->cogl_context != NULL)
return TRUE;
backend->cogl_renderer = cogl_renderer_new ();
#if defined(GDK_WINDOWING_X11) && defined(COGL_HAS_XLIB_SUPPORT)
if (GDK_IS_X11_DISPLAY (backend_gdk->display))
{
cogl_xlib_renderer_set_foreign_display (backend->cogl_renderer,
gdk_x11_display_get_xdisplay (backend_gdk->display));
}
else
#endif
#if defined(GDK_WINDOWING_WIN32)
if (GDK_IS_WIN32_DISPLAY (backend_gdk->display))
{
/* Force a WGL winsys on windows */
cogl_renderer_set_winsys_id (backend_cogl->cogl_renderer, COGL_WINSYS_ID_WGL);
}
else
#endif
{
g_set_error (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
"Could not find a suitable CoglWinsys for"
"a GdkDisplay of type %s", G_OBJECT_TYPE_NAME (backend_gdk->display));
goto error;
}
if (!cogl_renderer_connect (backend->cogl_renderer, error))
goto error;
swap_chain = cogl_swap_chain_new ();
rgba_visual = gdk_screen_get_rgba_visual (backend_gdk->screen);
cogl_swap_chain_set_has_alpha (swap_chain, rgba_visual != NULL);
onscreen_template = cogl_onscreen_template_new (swap_chain);
cogl_object_unref (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?
*/
if (!cogl_renderer_check_onscreen_template (backend->cogl_renderer,
onscreen_template,
error))
goto error;
backend->cogl_display = cogl_display_new (backend->cogl_renderer,
onscreen_template);
cogl_object_unref (backend->cogl_renderer);
cogl_object_unref (onscreen_template);
if (!cogl_display_setup (backend->cogl_display, error))
goto error;
backend->cogl_context = cogl_context_new (backend->cogl_display, error);
if (backend->cogl_context == NULL)
goto error;
return TRUE;
error:
if (backend->cogl_display != NULL)
{
cogl_object_unref (backend->cogl_display);
backend->cogl_display = NULL;
}
if (onscreen_template != NULL)
cogl_object_unref (onscreen_template);
if (swap_chain != NULL)
cogl_object_unref (swap_chain);
if (backend->cogl_renderer != NULL)
{
cogl_object_unref (backend->cogl_renderer);
backend->cogl_renderer = NULL;
}
return FALSE;
}
static ClutterStageWindow *
clutter_backend_gdk_create_stage (ClutterBackend *backend,
ClutterStage *wrapper,
GError **error)
{
return g_object_new (CLUTTER_TYPE_STAGE_GDK,
"backend", backend,
"wrapper", wrapper,
NULL);
}
static void
clutter_backend_gdk_class_init (ClutterBackendGdkClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterBackendClass *backend_class = CLUTTER_BACKEND_CLASS (klass);
gobject_class->dispose = clutter_backend_gdk_dispose;
gobject_class->finalize = clutter_backend_gdk_finalize;
backend_class->post_parse = _clutter_backend_gdk_post_parse;
backend_class->get_features = clutter_backend_gdk_get_features;
backend_class->get_device_manager = clutter_backend_gdk_get_device_manager;
backend_class->copy_event_data = clutter_backend_gdk_copy_event_data;
backend_class->free_event_data = clutter_backend_gdk_free_event_data;
backend_class->create_context = clutter_backend_gdk_create_context;
backend_class->create_stage = clutter_backend_gdk_create_stage;
}
static void
clutter_backend_gdk_init (ClutterBackendGdk *backend_gdk)
{
/* nothing to do here */
}
/**
* clutter_gdk_get_default_display:
*
* Retrieves the pointer to the default display.
*
* Return value: (transfer none): the default display
*
* Since: 0.6
*/
GdkDisplay *
clutter_gdk_get_default_display (void)
{
ClutterBackend *backend = clutter_get_default_backend ();
if (backend == NULL)
{
g_critical ("The Clutter backend has not been initialised");
return NULL;
}
if (!CLUTTER_IS_BACKEND_GDK (backend))
{
g_critical ("The Clutter backend is not a GDK backend");
return NULL;
}
return CLUTTER_BACKEND_GDK (backend)->display;
}
/**
* clutter_gdk_set_display:
* @display: pointer to a GDK display connection.
*
* Sets the display connection Clutter should use; must be called
* before clutter_init(), clutter_init_with_args() or other functions
* pertaining Clutter's initialization process.
*
* If you are parsing the command line arguments by retrieving Clutter's
* #GOptionGroup with clutter_get_option_group() and calling
* g_option_context_parse() yourself, you should also call
* clutter_gdk_set_display() before g_option_context_parse().
*
* Since: 0.8
*/
void
clutter_gdk_set_display (GdkDisplay *display)
{
if (_clutter_context_is_initialized ())
{
g_warning ("%s() can only be used before calling clutter_init()",
G_STRFUNC);
return;
}
_foreign_dpy = g_object_ref (display);
}
void
clutter_gdk_disable_event_retrieval (void)
{
if (_clutter_context_is_initialized ())
{
g_warning ("%s() can only be used before calling clutter_init()",
G_STRFUNC);
return;
}
disable_event_retrieval = TRUE;
}
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