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Add API to restrict the windowing backend to load

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In situations when the default backend would fail (for example
when compiled with X11 support but run without DISPLAY), or
when the application is using backend specific code, it makes
sense to let the application choose the backend explicitly.

https://bugzilla.gnome.org/show_bug.cgi?id=707869
This commit is contained in:
Giovanni Campagna
2013-09-10 18:29:28 +02:00
parent 5c035f2107
commit da3e6988ad
5 changed files with 83 additions and 50 deletions
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78
clutter/clutter-backend.c
View File

@ -83,6 +83,9 @@
/* XXX - should probably warn, here */
#include "tslib/clutter-event-tslib.h"
#endif
#ifdef CLUTTER_WINDOWING_EGL
#include "egl/clutter-backend-eglnative.h"
#endif
#ifdef CLUTTER_INPUT_WAYLAND
#include "wayland/clutter-device-manager-wayland.h"
#endif
@ -126,6 +129,7 @@ static guint backend_signals[LAST_SIGNAL] = { 0, };
static struct wl_display *_wayland_compositor_display;
#endif
static const char *allowed_backend;
static void
clutter_backend_dispose (GObject *gobject)
@ -463,6 +467,58 @@ clutter_backend_real_create_stage (ClutterBackend *backend,
NULL);
}
ClutterBackend *
_clutter_create_backend (void)
{
const char *backend = allowed_backend;
ClutterBackend *retval = NULL;
if (backend == NULL)
{
const char *backend_env = g_getenv ("CLUTTER_BACKEND");
if (backend_env != NULL)
backend = g_intern_string (backend_env);
}
#ifdef CLUTTER_WINDOWING_OSX
if (backend == NULL || backend == I_(CLUTTER_WINDOWING_OSX))
retval = g_object_new (CLUTTER_TYPE_BACKEND_OSX, NULL);
else
#endif
#ifdef CLUTTER_WINDOWING_WIN32
if (backend == NULL || backend == I_(CLUTTER_WINDOWING_WIN32))
retval = g_object_new (CLUTTER_TYPE_BACKEND_WIN32, NULL);
else
#endif
#ifdef CLUTTER_WINDOWING_X11
if (backend == NULL || backend == I_(CLUTTER_WINDOWING_X11))
retval = g_object_new (CLUTTER_TYPE_BACKEND_X11, NULL);
else
#endif
#ifdef CLUTTER_WINDOWING_WAYLAND
if (backend == NULL || backend == I_(CLUTTER_WINDOWING_WAYLAND))
retval = g_object_new (CLUTTER_TYPE_BACKEND_WAYLAND, NULL);
else
#endif
#ifdef CLUTTER_WINDOWING_EGL
if (backend == NULL || backend == I_(CLUTTER_WINDOWING_EGL))
retval = g_object_new (CLUTTER_TYPE_BACKEND_EGL_NATIVE, NULL);
else
#endif
#ifdef CLUTTER_WINDOWING_GDK
if (backend == NULL || backend == I_(CLUTTER_WINDOWING_GDK))
retval = g_object_new (CLUTTER_TYPE_BACKEND_GDK, NULL);
else
#endif
if (backend == NULL)
g_error ("No default Clutter backend found.");
else
g_error ("Unsupported Clutter backend: '%s'", backend);
return retval;
}
static void
clutter_backend_real_init_events (ClutterBackend *backend)
{
@ -506,8 +562,8 @@ clutter_backend_real_init_events (ClutterBackend *backend)
#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)
if ((input_backend != NULL && strcmp (input_backend, CLUTTER_INPUT_EVDEV) == 0) ||
clutter_check_windowing_backend (CLUTTER_WINDOWING_EGL))
{
_clutter_events_evdev_init (backend);
}
@ -1326,3 +1382,21 @@ clutter_wayland_set_compositor_display (void *display)
_wayland_compositor_display = display;
}
#endif
/**
* clutter_set_windowing_backend:
* @first_backend: the name of a clutter window backend
*
* Restricts clutter to only use the specified backend.
* This 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_backend = g_intern_string (backend_type);
}