356 lines
8.7 KiB
C
356 lines
8.7 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2006 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:clutter-backend
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* @short_description: Backend abstraction
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*
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* Clutter can be compiled against different backends. Each backend
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* has to implement a set of functions, in order to be used by Clutter.
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*
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* #ClutterBackend is the base class abstracting the various implementation;
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* it provides a basic API to query the backend for generic information
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* and settings.
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*
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* #ClutterBackend is available since Clutter 0.4
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*/
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#ifndef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "clutter-fixed.h"
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#include "clutter-backend.h"
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#include "clutter-private.h"
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G_DEFINE_ABSTRACT_TYPE (ClutterBackend, clutter_backend, G_TYPE_OBJECT);
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#define CLUTTER_BACKEND_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_BACKEND, ClutterBackendPrivate))
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struct _ClutterBackendPrivate
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{
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/* settings */
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guint double_click_time;
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guint double_click_distance;
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ClutterFixed resolution;
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};
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static void
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clutter_backend_dispose (GObject *gobject)
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{
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ClutterMainContext *clutter_context;
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clutter_context = clutter_context_get_default ();
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if (clutter_context && clutter_context->events_queue)
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{
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g_queue_foreach (clutter_context->events_queue, (GFunc) clutter_event_free, NULL);
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g_queue_free (clutter_context->events_queue);
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clutter_context->events_queue = NULL;
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}
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G_OBJECT_CLASS (clutter_backend_parent_class)->dispose (gobject);
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}
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static void
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clutter_backend_class_init (ClutterBackendClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->dispose = clutter_backend_dispose;
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g_type_class_add_private (gobject_class, sizeof (ClutterBackendPrivate));
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}
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static void
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clutter_backend_init (ClutterBackend *backend)
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{
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ClutterBackendPrivate *priv;
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priv = backend->priv = CLUTTER_BACKEND_GET_PRIVATE(backend);
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priv->resolution = -1.0;
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}
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ClutterActor *
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_clutter_backend_get_stage (ClutterBackend *backend)
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{
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), NULL);
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return CLUTTER_BACKEND_GET_CLASS (backend)->get_stage (backend);
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}
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void
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_clutter_backend_add_options (ClutterBackend *backend,
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GOptionGroup *group)
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{
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ClutterBackendClass *klass;
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g_return_if_fail (CLUTTER_IS_BACKEND (backend));
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klass = CLUTTER_BACKEND_GET_CLASS (backend);
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if (klass->add_options)
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klass->add_options (backend, group);
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}
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gboolean
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_clutter_backend_pre_parse (ClutterBackend *backend,
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GError **error)
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{
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ClutterBackendClass *klass;
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), FALSE);
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klass = CLUTTER_BACKEND_GET_CLASS (backend);
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if (klass->pre_parse)
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return klass->pre_parse (backend, error);
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return TRUE;
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}
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gboolean
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_clutter_backend_post_parse (ClutterBackend *backend,
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GError **error)
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{
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ClutterBackendClass *klass;
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), FALSE);
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klass = CLUTTER_BACKEND_GET_CLASS (backend);
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if (klass->post_parse)
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return klass->post_parse (backend, error);
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return TRUE;
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}
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gboolean
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_clutter_backend_init_stage (ClutterBackend *backend,
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GError **error)
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{
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ClutterBackendClass *klass;
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), FALSE);
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klass = CLUTTER_BACKEND_GET_CLASS (backend);
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if (klass->init_stage)
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return klass->init_stage (backend, error);
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return TRUE;
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}
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void
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_clutter_backend_redraw (ClutterBackend *backend)
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{
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ClutterBackendClass *klass;
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klass = CLUTTER_BACKEND_GET_CLASS (backend);
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if (G_LIKELY(klass->redraw))
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klass->redraw (backend);
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}
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ClutterFeatureFlags
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_clutter_backend_get_features (ClutterBackend *backend)
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{
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ClutterBackendClass *klass;
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), 0);
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klass = CLUTTER_BACKEND_GET_CLASS (backend);
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if (klass->get_features)
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return klass->get_features (backend);
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return 0;
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}
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void
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_clutter_backend_init_events (ClutterBackend *backend)
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{
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ClutterBackendClass *klass;
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ClutterMainContext *clutter_context;
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clutter_context = clutter_context_get_default ();
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g_return_if_fail (CLUTTER_IS_BACKEND (backend));
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g_return_if_fail (clutter_context != NULL);
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clutter_context->events_queue = g_queue_new ();
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klass = CLUTTER_BACKEND_GET_CLASS (backend);
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if (klass->init_events)
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klass->init_events (backend);
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}
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/**
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* clutter_get_default_backend:
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*
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* FIXME
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*
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* Return value: the default backend. You should not ref or
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* unref the returned object. Applications should not rarely need
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* to use this.
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*
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* Since: 0.4
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*/
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ClutterBackend *
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clutter_get_default_backend (void)
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{
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ClutterMainContext *clutter_context;
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clutter_context = clutter_context_get_default ();
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return clutter_context->backend;
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}
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/* FIXME: below should probably be moved into clutter_main */
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/**
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* clutter_backend_set_double_click_time:
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* @backend: a #ClutterBackend
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* @msec: milliseconds between two button press events
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*
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* Sets the maximum time between two button press events, used to
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* verify whether it's a double click event or not.
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*
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* Since: 0.4
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*/
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void
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clutter_backend_set_double_click_time (ClutterBackend *backend,
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guint msec)
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{
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g_return_if_fail (CLUTTER_IS_BACKEND (backend));
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backend->priv->double_click_time = msec;
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}
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/**
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* clutter_backend_get_double_click_time:
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* @backend: a #ClutterBackend
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*
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* Gets the maximum time between two button press events, as set
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* by clutter_backend_set_double_click_time().
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*
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* Return value: a time in milliseconds
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*
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* Since: 0.4
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*/
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guint
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clutter_backend_get_double_click_time (ClutterBackend *backend)
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{
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), 0);
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return backend->priv->double_click_time;
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}
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/**
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* clutter_backend_set_double_click_distance:
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* @backend: a #ClutterBackend
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* @distance: a distance, in pixels
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*
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* Sets the maximum distance used to verify a double click event.
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*
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* Since: 0.4
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*/
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void
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clutter_backend_set_double_click_distance (ClutterBackend *backend,
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guint distance)
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{
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g_return_if_fail (CLUTTER_IS_BACKEND (backend));
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backend->priv->double_click_distance = distance;
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}
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/**
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* clutter_backend_get_double_click_distance:
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* @backend: a #ClutterBackend
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*
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* Retrieves the distance used to verify a double click event
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*
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* Return value: a distance, in pixels.
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*
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* Since: 0.4
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*/
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guint
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clutter_backend_get_double_click_distance (ClutterBackend *backend)
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{
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), 0);
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return backend->priv->double_click_distance;
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}
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/**
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* clutter_backend_set_resolution:
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* @backend: a #ClutterBackend
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* @dpi: the resolution in "dots per inch" (Physical inches aren't
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* actually involved; the terminology is conventional).
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*
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* Sets the resolution for font handling on the screen. This is a
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* scale factor between points specified in a #PangoFontDescription
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* and cairo units. The default value is 96, meaning that a 10 point
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* font will be 13 units high. (10 * 96. / 72. = 13.3).
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*
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* Applications should never need to call this function.
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*
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* Since: 0.4
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*/
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void
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clutter_backend_set_resolution (ClutterBackend *backend,
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gdouble dpi)
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{
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ClutterFixed fixed_dpi;
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ClutterBackendPrivate *priv;
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g_return_if_fail (CLUTTER_IS_BACKEND (backend));
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if (dpi < 0)
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dpi = -1.0;
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priv = backend->priv;
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fixed_dpi = CLUTTER_FLOAT_TO_FIXED (dpi);
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if (priv->resolution != fixed_dpi)
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priv->resolution = fixed_dpi;
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}
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/**
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* clutter_backend_get_resolution:
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* @backend: a #ClutterBackend
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*
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* Gets the resolution for font handling on the screen; see
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* clutter_backend_set_resolution() for full details.
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*
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* Return value: the current resolution, or -1 if no resolution
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* has been set.
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*
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* Since: 0.4
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*/
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gdouble
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clutter_backend_get_resolution (ClutterBackend *backend)
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{
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), -1.0);
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return CLUTTER_FIXED_TO_FLOAT (backend->priv->resolution);
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}
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