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8fc8a73580
mutter/clutter/gdk/clutter-backend-gdk.c
Emmanuele Bassi 8fc8a73580 gdk: Use RGBA visual if there is one 
The condition check for the has_rgba_visual flag is reversed, and thus
we relied on drivers returning an ARGB visual first by default.

Referenced by: https://bugzilla.redhat.com/show_bug.cgi?id=1206960
2015-05-07 13:28:33 +01:00

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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>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <gdk/gdk.h>
#include <cogl/cogl.h>
#ifndef GDK_WINDOWING_WIN32
#include <sys/ioctl.h>
#endif
#if defined(GDK_WINDOWING_X11) && defined(COGL_HAS_XLIB_SUPPORT)
#include <cogl/cogl-xlib.h>
#endif
#if defined(GDK_WINDOWING_WAYLAND) && defined(COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
#include <cogl/cogl-wayland-client.h>
#endif
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif
#ifdef GDK_WINDOWING_WAYLAND
#include <gdk/gdkwayland.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"
#include "clutter-settings-private.h"
#define clutter_backend_gdk_get_type _clutter_backend_gdk_get_type
G_DEFINE_TYPE (ClutterBackendGdk, clutter_backend_gdk, CLUTTER_TYPE_BACKEND);
/* 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);
clutter_settings_set_property_internal (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);
clutter_settings_set_property_internal (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
ClutterBackend *backend = data;
CoglFilterReturn ret;
ret = cogl_xlib_renderer_handle_event (backend->cogl_renderer, (XEvent *) xevent);
switch (ret)
{
case COGL_FILTER_REMOVE:
return GDK_FILTER_REMOVE;
case COGL_FILTER_CONTINUE:
default:
return GDK_FILTER_CONTINUE;
}
#endif
return GDK_FILTER_CONTINUE;
}
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))
{
g_set_error (error, CLUTTER_INIT_ERROR, CLUTTER_INIT_ERROR_BACKEND,
_("Could not initialize Gdk"));
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);
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, backend_gdk);
clutter_backend_gdk_init_settings (backend_gdk);
CLUTTER_NOTE (BACKEND,
"Gdk Display '%s' opened",
gdk_display_get_name (backend_gdk->display));
return TRUE;
}
static void
gdk_event_handler (GdkEvent *event,
gpointer user_data)
{
clutter_gdk_handle_event (event);
}
void
_clutter_backend_gdk_events_init (ClutterBackend *backend)
{
ClutterBackendGdk *backend_gdk = CLUTTER_BACKEND_GDK (backend);
CLUTTER_NOTE (EVENT, "initialising the event loop");
backend->device_manager =
g_object_new (CLUTTER_TYPE_DEVICE_MANAGER_GDK,
"backend", backend,
"gdk-display", backend_gdk->display,
NULL);
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, backend_gdk);
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)
{
ClutterBackendClass *parent_class;
parent_class = CLUTTER_BACKEND_CLASS (clutter_backend_gdk_parent_class);
return parent_class->get_features (backend)
| CLUTTER_FEATURE_STAGE_USER_RESIZE
| CLUTTER_FEATURE_STAGE_CURSOR;
}
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 CoglRenderer *
clutter_backend_gdk_get_renderer (ClutterBackend *backend,
GError **error)
{
ClutterBackendGdk *backend_gdk = CLUTTER_BACKEND_GDK (backend);
CoglRenderer *renderer = cogl_renderer_new ();
#if defined(GDK_WINDOWING_X11) && defined(COGL_HAS_XLIB_SUPPORT)
if (GDK_IS_X11_DISPLAY (backend_gdk->display))
{
Display *xdisplay = gdk_x11_display_get_xdisplay (backend_gdk->display);
cogl_xlib_renderer_set_foreign_display (renderer, xdisplay);
}
else
#endif
#if defined(GDK_WINDOWING_WAYLAND) && defined(COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
if (GDK_IS_WAYLAND_DISPLAY (backend_gdk->display))
{
struct wl_display *display = gdk_wayland_display_get_wl_display (backend_gdk->display);
/* Force a Wayland winsys */
cogl_renderer_set_winsys_id (renderer, COGL_WINSYS_ID_EGL_WAYLAND);
cogl_wayland_renderer_set_foreign_display (renderer, display);
cogl_wayland_renderer_set_event_dispatch_enabled (renderer, !disable_event_retrieval);
}
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 (renderer, COGL_WINSYS_ID_WGL);
cogl_win32_renderer_set_event_retrieval_enabled (renderer, FALSE);
}
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));
cogl_object_unref (renderer);
return NULL;
}
return renderer;
}
static CoglDisplay *
clutter_backend_gdk_get_display (ClutterBackend *backend,
CoglRenderer *renderer,
CoglSwapChain *swap_chain,
GError **error)
{
ClutterBackendGdk *backend_gdk = CLUTTER_BACKEND_GDK (backend);
CoglOnscreenTemplate *onscreen_template;
GError *internal_error = NULL;
CoglDisplay *display;
gboolean has_rgba_visual;
gboolean res;
/* We default to an RGBA visual if there is one */
has_rgba_visual = gdk_screen_get_rgba_visual (backend_gdk->screen) != NULL;
CLUTTER_NOTE (BACKEND, "Alpha on Cogl swap chain: %s",
has_rgba_visual ? "enabled" : "disabled");
cogl_swap_chain_set_has_alpha (swap_chain, has_rgba_visual);
onscreen_template = cogl_onscreen_template_new (swap_chain);
res = cogl_renderer_check_onscreen_template (renderer,
onscreen_template,
&internal_error);
if (!res && has_rgba_visual)
{
CLUTTER_NOTE (BACKEND,
"Creation of a context with a ARGB visual failed: %s",
internal_error != NULL ? internal_error->message
: "Unknown reason");
g_clear_error (&internal_error);
/* It's possible that the current renderer doesn't support transparency
* in a swap_chain so lets see if we can fallback to not having any
* transparency...
*
* XXX: It might be nice to have a CoglRenderer feature we could
* explicitly check for ahead of time.
*/
cogl_swap_chain_set_has_alpha (swap_chain, FALSE);
res = cogl_renderer_check_onscreen_template (renderer,
onscreen_template,
&internal_error);
}
if (!res)
{
g_set_error_literal (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
internal_error->message);
g_error_free (internal_error);
cogl_object_unref (onscreen_template);
return NULL;
}
display = cogl_display_new (renderer, onscreen_template);
cogl_object_unref (onscreen_template);
return display;
}
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->stage_window_type = CLUTTER_TYPE_STAGE_GDK;
backend_class->post_parse = _clutter_backend_gdk_post_parse;
backend_class->get_features = clutter_backend_gdk_get_features;
backend_class->copy_event_data = clutter_backend_gdk_copy_event_data;
backend_class->free_event_data = clutter_backend_gdk_free_event_data;
backend_class->get_renderer = clutter_backend_gdk_get_renderer;
backend_class->get_display = clutter_backend_gdk_get_display;
}
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);
}
/**
* clutter_gdk_disable_event_retrieval:
*
* Disable the event retrieval in Clutter.
*
* Callers of this function have to set up an event filter using the
* GDK API, and call clutter_gdk_handle_event().
*
* This function should only be used when embedding Clutter into
* a GDK based toolkit.
*
* Since: 1.10
*/
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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