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Allow checking the backend type at run-time
Portable code should be allowed to check type backend currently being used, so that it can use platform-specific API (not just Clutter's). We don't want to go down the GDK route, with public types for ClutterBackend and ClutterStageWindow implementations, and use the type system, e.g.: #ifdef GDK_WINDOWING_X11 if (GDK_IS_WINDOW_X11 (window)) use_x11_api (window); else #endif #ifdef GDK_WINDOWING_WIN32 if (GDK_IS_WINDOW_WIN32 (window)) use_win32_api (window); else #endif g_critical ("Unsupported backend"); This system would make us expose the backend system, and we want to still reserve us the option to change the backend system to increase its granularity — e.g. choosing different input event systems regardless of the windowing system. This commit adds a simple function that checks the backend type against a symbolic constant — the same constant string that can be used to select the backend at run-time through the CLUTTER_BACKEND environment variable.
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@ -48,6 +48,73 @@ G_BEGIN_DECLS
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#define CLUTTER_BACKEND(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_BACKEND, ClutterBackend))
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#define CLUTTER_IS_BACKEND(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_BACKEND))
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/**
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* CLUTTER_OSX_BACKEND:
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*
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* Evaluates to the symbolic name of the Quartz Clutter backend.
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*
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* This macro should be used with clutter_check_backend().
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*
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* Since: 1.10
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*/
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#define CLUTTER_OSX_BACKEND "osx"
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/**
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* CLUTTER_X11_BACKEND:
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*
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* Evaluates to the symbolic name of the X11 Clutter backend.
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*
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* This macro should be used with clutter_check_backend().
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*
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* Since: 1.10
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*/
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#define CLUTTER_X11_BACKEND "x11"
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/**
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* CLUTTER_WIN32_BACKEND:
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*
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* Evaluates to the symbolic name of the Windows Clutter backend.
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*
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* This macro should be used with clutter_check_backend().
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*
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* Since: 1.10
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*/
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#define CLUTTER_WIN32_BACKEND "win32"
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/**
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* CLUTTER_EGL_NATIVE_BACKEND:
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*
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* Evaluates to the symbolic name of the EGL framebuffer Clutter backend.
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*
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* This macro should be used with clutter_check_backend().
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*
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* Since: 1.10
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*/
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#define CLUTTER_EGL_NATIVE_BACKEND "eglnative"
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/**
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* CLUTTER_WAYLAND_BACKEND:
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*
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* Evaluates to the symbolic name of the Wayland client Clutter backend.
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*
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* This macro should be used with clutter_check_backend().
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*
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* Since: 1.10
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*/
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#define CLUTTER_WAYLAND_BACKEND "wayland"
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/**
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* CLUTTER_GDK_BACKEND:
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*
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* Evaluates to the symbolic name of the GDK Clutter backend.
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*
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* This macro should be used with clutter_check_backend().
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*
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* Since: 1.10
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*/
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#define CLUTTER_GDK_BACKEND "gdk"
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/**
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* ClutterBackend:
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*
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@ -1326,32 +1326,32 @@ clutter_context_get_default_unlocked (void)
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backend = g_getenv ("CLUTTER_BACKEND");
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#ifdef CLUTTER_WINDOWING_OSX
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if (backend == NULL || strcmp (backend, "osx") == 0)
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if (backend == NULL || strcmp (backend, CLUTTER_OSX_BACKEND) == 0)
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ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_OSX, NULL);
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else
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#endif
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#ifdef CLUTTER_WINDOWING_WIN32
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if (backend == NULL || strcmp (backend, "win32") == 0)
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if (backend == NULL || strcmp (backend, CLUTTER_WIN32_BACKEND) == 0)
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ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_WIN32, NULL);
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else
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#endif
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#ifdef CLUTTER_WINDOWING_WAYLAND
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if (backend == NULL || strcmp (backend, "wayland") == 0)
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if (backend == NULL || strcmp (backend, CLUTTER_WAYLAND_BACKEND) == 0)
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ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_WAYLAND, NULL);
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else
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#endif
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#ifdef CLUTTER_WINDOWING_EGL
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if (backend == NULL || strcmp (backend, "eglnative") == 0)
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if (backend == NULL || strcmp (backend, CLUTTER_EGL_NATIVE_BACKEND) == 0)
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ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_EGLNATIVE, NULL);
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else
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#endif
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#ifdef CLUTTER_WINDOWING_X11
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if (backend == NULL || strcmp (backend, "x11") == 0)
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if (backend == NULL || strcmp (backend, CLUTTER_X11_BACKEND) == 0)
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ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_X11, NULL);
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else
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#endif
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#ifdef CLUTTER_WINDOWING_GDK
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if (backend == NULL || strcmp (backend, "gdk") == 0)
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if (backend == NULL || strcmp (backend, CLUTTER_GDK_BACKEND) == 0)
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ctx->backend = g_object_new (CLUTTER_TYPE_BACKEND_GDK, NULL);
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else
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#endif
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@ -3610,3 +3610,61 @@ _clutter_context_get_motion_events_enabled (void)
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return context->motion_events_per_actor;
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}
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/**
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* clutter_check_backend:
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* @backend_type: the name of the backend to check
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*
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* Checks the run-time name of the Clutter backend, using the symbolic
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* macros like %CLUTTER_OSX_BACKEND or %CLUTTER_X11_BACKEND.
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*
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* Return value: %TRUE if the current Clutter backend is the one checked,
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* and %FALSE otherwise
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*
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* Since: 1.10
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*/
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gboolean
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clutter_check_backend (const char *backend_type)
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{
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ClutterMainContext *context = _clutter_context_get_default ();
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g_return_val_if_fail (backend_type != NULL, FALSE);
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#ifdef CLUTTER_WINDOWING_OSX
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if (strcmp (backend_type, CLUTTER_OSX_BACKEND) == 0 &&
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CLUTTER_IS_BACKEND_OSX (context->backend))
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return TRUE;
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else
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#endif
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#ifdef CLUTTER_WINDOWING_WIN32
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if (strcmp (backend_type, CLUTTER_WIN32_BACKEND) == 0 &&
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CLUTTER_IS_BACKEND_WIN32 (context->backend))
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return TRUE;
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else
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#endif
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#ifdef CLUTTER_WINDOWING_WAYLAND
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if (strcmp (backend_type, CLUTTER_WAYLAND_BACKEND) == 0 &&
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CLUTTER_IS_BACKEND_WAYLAND (context->backend))
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return TRUE;
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else
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#endif
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#ifdef CLUTTER_WINDOWING_EGL
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if (strcmp (backend_type, CLUTTER_EGL_BACKEND) == 0 &&
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CLUTTER_IS_BACKEND_EGL_NATIVE (context->backend))
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return TRUE;
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else
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#endif
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#ifdef CLUTTER_WINDOWING_X11
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if (strcmp (backend_type, CLUTTER_X11_BACKEND) == 0 &&
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CLUTTER_IS_BACKEND_X11 (context->backend))
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return TRUE;
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else
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#endif
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#ifdef CLUTTER_WINDOWING_GDK
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if (strcmp (backend_type, CLUTTER_GDK_BACKEND) == 0 &&
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CLUTTER_IS_BACKEND_GDK (context->backend))
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return TRUE;
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else
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#endif
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return FALSE;
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}
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@ -195,6 +195,8 @@ gboolean clutter_check_version (guint major,
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guint minor,
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guint micro);
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gboolean clutter_check_backend (const char *backend_type);
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G_END_DECLS
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#endif /* __CLUTTER_VERSION_H__ */
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