52a78a7220
While this is totally fine (0 in the pointer context will be converted in the right internal NULL representation, which could be a value with some bits to 1), I believe it's clearer to use NULL in the pointer context. It seems that, in most case, it's more an overlook than a deliberate choice to use FALSE/0 as NULL, eg. copying a _COGL_GET_CONTEXT (ctx, 0) or a g_return_val_if_fail (cond, 0) from a function returning a gboolean.
806 lines
21 KiB
C
806 lines
21 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:
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* Matthew Allum <mallum@openedhand.com>
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* Emmanuele Bassi <ebassi@linux.intel.com>
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*
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* Copyright (C) 2006, 2007, 2008 OpenedHand Ltd
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* Copyright (C) 2009, 2010 Intel Corp
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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, see <http://www.gnu.org/licenses/>.
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "clutter-backend.h"
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#include "clutter-debug.h"
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#include "clutter-fixed.h"
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#include "clutter-marshal.h"
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#include "clutter-private.h"
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#include "clutter-profile.h"
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#include <cogl/cogl.h>
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G_DEFINE_ABSTRACT_TYPE (ClutterBackend, clutter_backend, G_TYPE_OBJECT);
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#define DEFAULT_FONT_NAME "Sans 10"
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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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gdouble resolution;
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gfloat units_per_em;
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gint32 units_serial;
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cairo_font_options_t *font_options;
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gchar *font_name;
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};
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enum
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{
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RESOLUTION_CHANGED,
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FONT_CHANGED,
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LAST_SIGNAL
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};
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static guint backend_signals[LAST_SIGNAL] = { 0, };
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static void
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clutter_backend_dispose (GObject *gobject)
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{
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ClutterBackendPrivate *priv = CLUTTER_BACKEND (gobject)->priv;
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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,
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(GFunc) clutter_event_free,
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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_free (priv->font_name);
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clutter_backend_set_font_options (CLUTTER_BACKEND (gobject), NULL);
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G_OBJECT_CLASS (clutter_backend_parent_class)->dispose (gobject);
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}
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static gfloat
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get_units_per_em (ClutterBackend *backend,
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PangoFontDescription *font_desc)
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{
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gfloat units_per_em = -1.0;
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gboolean free_font_desc = FALSE;
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gdouble dpi;
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dpi = clutter_backend_get_resolution (backend);
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if (font_desc == NULL)
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{
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const gchar *font_name = clutter_backend_get_font_name (backend);
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if (G_LIKELY (font_name != NULL && *font_name != '\0'))
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{
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font_desc = pango_font_description_from_string (font_name);
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free_font_desc = TRUE;
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}
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}
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if (font_desc != NULL)
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{
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gdouble font_size = 0;
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gint pango_size;
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gboolean is_absolute;
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pango_size = pango_font_description_get_size (font_desc);
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is_absolute = pango_font_description_get_size_is_absolute (font_desc);
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/* "absolute" means "device units" (usually, pixels); otherwise,
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* it means logical units (points)
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*/
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if (is_absolute)
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font_size = (gdouble) pango_size / PANGO_SCALE;
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else
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font_size = (gdouble) pango_size / PANGO_SCALE
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* dpi
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/ 96.0f;
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/* 10 points at 96 DPI is 13.3 pixels */
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units_per_em = (1.2f * font_size)
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* dpi
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/ 96.0f;
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}
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else
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units_per_em = -1.0f;
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if (free_font_desc)
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pango_font_description_free (font_desc);
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return units_per_em;
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}
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static void
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clutter_backend_real_resolution_changed (ClutterBackend *backend)
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{
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ClutterBackendPrivate *priv = backend->priv;
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priv->units_per_em = get_units_per_em (backend, NULL);
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priv->units_serial += 1;
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CLUTTER_NOTE (BACKEND, "Units per em: %.2f", backend->priv->units_per_em);
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}
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static void
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clutter_backend_real_font_changed (ClutterBackend *backend)
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{
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ClutterBackendPrivate *priv = backend->priv;
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priv->units_per_em = get_units_per_em (backend, NULL);
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priv->units_serial += 1;
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CLUTTER_NOTE (BACKEND, "Units per em: %.2f", backend->priv->units_per_em);
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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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backend_signals[RESOLUTION_CHANGED] =
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g_signal_new (I_("resolution-changed"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (ClutterBackendClass, resolution_changed),
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NULL, NULL,
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clutter_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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backend_signals[FONT_CHANGED] =
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g_signal_new (I_("font-changed"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (ClutterBackendClass, font_changed),
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NULL, NULL,
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clutter_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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klass->resolution_changed = clutter_backend_real_resolution_changed;
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klass->font_changed = clutter_backend_real_font_changed;
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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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priv->units_per_em = -1.0;
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priv->units_serial = 1;
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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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ClutterStageWindow *
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_clutter_backend_create_stage (ClutterBackend *backend,
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ClutterStage *wrapper,
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GError **error)
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{
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ClutterBackendClass *klass;
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ClutterStageManager *stage_manager;
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ClutterStageWindow *stage_window;
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), NULL);
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g_return_val_if_fail (CLUTTER_IS_STAGE (wrapper), NULL);
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stage_manager = clutter_stage_manager_get_default ();
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klass = CLUTTER_BACKEND_GET_CLASS (backend);
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if (klass->create_stage != NULL)
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stage_window = klass->create_stage (backend, wrapper, error);
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else
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stage_window = NULL;
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if (stage_window == NULL)
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return NULL;
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g_assert (CLUTTER_IS_STAGE_WINDOW (stage_window));
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_clutter_stage_set_window (wrapper, stage_window);
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_clutter_stage_manager_add_stage (stage_manager, wrapper);
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return stage_window;
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}
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void
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_clutter_backend_redraw (ClutterBackend *backend,
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ClutterStage *stage)
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{
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ClutterBackendClass *klass;
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CLUTTER_STATIC_COUNTER (redraw_counter,
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"_clutter_backend_redraw counter",
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"Increments for each _clutter_backend_redraw call",
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0 /* no application private data */);
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CLUTTER_STATIC_TIMER (redraw_timer,
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"Master Clock", /* parent */
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"Redrawing",
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"The time spent redrawing everything",
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0 /* no application private data */);
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CLUTTER_COUNTER_INC (_clutter_uprof_context, redraw_counter);
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CLUTTER_TIMER_START (_clutter_uprof_context, redraw_timer);
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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, stage);
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CLUTTER_TIMER_STOP (_clutter_uprof_context, redraw_timer);
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}
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gboolean
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_clutter_backend_create_context (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->create_context)
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return klass->create_context (backend, error);
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return TRUE;
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}
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void
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_clutter_backend_ensure_context_internal (ClutterBackend *backend,
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ClutterStage *stage)
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{
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ClutterBackendClass *klass = CLUTTER_BACKEND_GET_CLASS (backend);
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if (G_LIKELY (klass->ensure_context))
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klass->ensure_context (backend, stage);
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}
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void
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_clutter_backend_ensure_context (ClutterBackend *backend,
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ClutterStage *stage)
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{
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static ClutterStage *current_context_stage = NULL;
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g_return_if_fail (CLUTTER_IS_BACKEND (backend));
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g_return_if_fail (CLUTTER_IS_STAGE (stage));
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if (current_context_stage != stage || !CLUTTER_ACTOR_IS_REALIZED (stage))
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{
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ClutterStage *new_stage = NULL;
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if (!CLUTTER_ACTOR_IS_REALIZED (stage))
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{
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new_stage = NULL;
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CLUTTER_NOTE (MULTISTAGE,
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"Stage [%p] is not realized, unsetting the stage",
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stage);
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}
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else
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{
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new_stage = stage;
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CLUTTER_NOTE (MULTISTAGE,
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"Setting the new stage [%p]",
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new_stage);
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}
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_clutter_backend_ensure_context_internal (backend, new_stage);
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/* XXX: Until Cogl becomes fully responsible for backend windows
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* Clutter need to manually keep it informed of the current window size
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*
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* NB: This must be done after we ensure_context above because Cogl
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* always assumes there is a current GL context.
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*/
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if (new_stage)
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{
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float width, height;
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clutter_actor_get_size (CLUTTER_ACTOR (stage), &width, &height);
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_cogl_onscreen_clutter_backend_set_size (width, height);
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}
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/* FIXME: With a NULL stage and thus no active context it may make more
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* sense to clean the context but then re call with the default stage
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* so at least there is some kind of context in place (as to avoid
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* potential issue of GL calls with no context)
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*/
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current_context_stage = new_stage;
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/* if the new stage has a different size than the previous one
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* we need to update the viewport; we do it by simply setting the
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* SYNC_MATRICES flag and letting the next redraw cycle take care
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* of calling glViewport()
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*/
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if (current_context_stage)
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{
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CLUTTER_SET_PRIVATE_FLAGS (current_context_stage,
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CLUTTER_ACTOR_SYNC_MATRICES);
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}
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}
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else
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CLUTTER_NOTE (MULTISTAGE, "Stage is the same");
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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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GError *error;
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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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/* we need to have a context here; so we create the
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* GL context first and the ask for features. if the
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* context already exists this should be a no-op
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*/
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error = NULL;
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if (klass->create_context)
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{
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gboolean res;
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res = klass->create_context (backend, &error);
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if (!res)
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{
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if (error)
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{
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g_critical ("Unable to create a context: %s", error->message);
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g_error_free (error);
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}
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else
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g_critical ("Unable to create a context: unknown error");
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return 0;
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}
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}
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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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gfloat
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_clutter_backend_get_units_per_em (ClutterBackend *backend,
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PangoFontDescription *font_desc)
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{
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ClutterBackendPrivate *priv;
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g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), 0);
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priv = backend->priv;
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/* recompute for the font description, but do not cache the result */
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if (font_desc != NULL)
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return get_units_per_em (backend, font_desc);
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if (priv->units_per_em < 0)
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priv->units_per_em = get_units_per_em (backend, NULL);
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return priv->units_per_em;
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}
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/**
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* clutter_get_default_backend:
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*
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* Retrieves the default #ClutterBackend used by Clutter. The
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* #ClutterBackend holds backend-specific configuration options.
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|
*
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* Return value: (transfer none): the default backend. You should
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* not ref or unref the returned object. Applications should rarely
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* need 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;
|
|
}
|
|
|
|
/**
|
|
* clutter_backend_get_double_click_time:
|
|
* @backend: a #ClutterBackend
|
|
*
|
|
* Gets the maximum time between two button press events, as set
|
|
* by clutter_backend_set_double_click_time().
|
|
*
|
|
* Return value: a time in milliseconds
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
guint
|
|
clutter_backend_get_double_click_time (ClutterBackend *backend)
|
|
{
|
|
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), 0);
|
|
|
|
return backend->priv->double_click_time;
|
|
}
|
|
|
|
/**
|
|
* clutter_backend_set_double_click_distance:
|
|
* @backend: a #ClutterBackend
|
|
* @distance: a distance, in pixels
|
|
*
|
|
* Sets the maximum distance used to verify a double click event.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
void
|
|
clutter_backend_set_double_click_distance (ClutterBackend *backend,
|
|
guint distance)
|
|
{
|
|
g_return_if_fail (CLUTTER_IS_BACKEND (backend));
|
|
|
|
backend->priv->double_click_distance = distance;
|
|
}
|
|
|
|
/**
|
|
* clutter_backend_get_double_click_distance:
|
|
* @backend: a #ClutterBackend
|
|
*
|
|
* Retrieves the distance used to verify a double click event
|
|
*
|
|
* Return value: a distance, in pixels.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
guint
|
|
clutter_backend_get_double_click_distance (ClutterBackend *backend)
|
|
{
|
|
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), 0);
|
|
|
|
return backend->priv->double_click_distance;
|
|
}
|
|
|
|
/**
|
|
* clutter_backend_set_resolution:
|
|
* @backend: a #ClutterBackend
|
|
* @dpi: the resolution in "dots per inch" (Physical inches aren't
|
|
* actually involved; the terminology is conventional).
|
|
*
|
|
* Sets the resolution for font handling on the screen. This is a
|
|
* scale factor between points specified in a #PangoFontDescription
|
|
* and cairo units. The default value is 96, meaning that a 10 point
|
|
* font will be 13 units high. (10 * 96. / 72. = 13.3).
|
|
*
|
|
* Applications should never need to call this function.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
void
|
|
clutter_backend_set_resolution (ClutterBackend *backend,
|
|
gdouble dpi)
|
|
{
|
|
ClutterBackendPrivate *priv;
|
|
|
|
g_return_if_fail (CLUTTER_IS_BACKEND (backend));
|
|
|
|
priv = backend->priv;
|
|
|
|
if (dpi < 0)
|
|
dpi = -1.0;
|
|
|
|
priv->resolution = dpi;
|
|
|
|
if (CLUTTER_CONTEXT ()->font_map)
|
|
cogl_pango_font_map_set_resolution (CLUTTER_CONTEXT ()->font_map, dpi);
|
|
|
|
g_signal_emit (backend, backend_signals[RESOLUTION_CHANGED], 0);
|
|
}
|
|
|
|
/**
|
|
* clutter_backend_get_resolution:
|
|
* @backend: a #ClutterBackend
|
|
*
|
|
* Gets the resolution for font handling on the screen; see
|
|
* clutter_backend_set_resolution() for full details.
|
|
*
|
|
* Return value: the current resolution, or -1 if no resolution
|
|
* has been set.
|
|
*
|
|
* Since: 0.4
|
|
*/
|
|
gdouble
|
|
clutter_backend_get_resolution (ClutterBackend *backend)
|
|
{
|
|
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), -1.0);
|
|
|
|
return backend->priv->resolution;
|
|
}
|
|
|
|
/**
|
|
* clutter_backend_set_font_options:
|
|
* @backend: a #ClutterBackend
|
|
* @options: Cairo font options for the backend, or %NULL
|
|
*
|
|
* Sets the new font options for @backend. The #ClutterBackend will
|
|
* copy the #cairo_font_options_t.
|
|
*
|
|
* If @options is %NULL, the first following call to
|
|
* clutter_backend_get_font_options() will return the default font
|
|
* options for @backend.
|
|
*
|
|
* This function is intended for actors creating a Pango layout
|
|
* using the PangoCairo API.
|
|
*
|
|
* Since: 0.8
|
|
*/
|
|
void
|
|
clutter_backend_set_font_options (ClutterBackend *backend,
|
|
const cairo_font_options_t *options)
|
|
{
|
|
ClutterBackendPrivate *priv;
|
|
|
|
g_return_if_fail (CLUTTER_IS_BACKEND (backend));
|
|
|
|
priv = backend->priv;
|
|
|
|
if (priv->font_options != options)
|
|
{
|
|
if (priv->font_options)
|
|
cairo_font_options_destroy (priv->font_options);
|
|
|
|
if (options)
|
|
priv->font_options = cairo_font_options_copy (options);
|
|
else
|
|
priv->font_options = NULL;
|
|
|
|
g_signal_emit (backend, backend_signals[FONT_CHANGED], 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* clutter_backend_get_font_options:
|
|
* @backend: a #ClutterBackend
|
|
*
|
|
* Retrieves the font options for @backend.
|
|
*
|
|
* Return value: (transfer none): the font options of the #ClutterBackend.
|
|
* The returned #cairo_font_options_t is owned by the backend and should
|
|
* not be modified or freed
|
|
*
|
|
* Since: 0.8
|
|
*/
|
|
const cairo_font_options_t *
|
|
clutter_backend_get_font_options (ClutterBackend *backend)
|
|
{
|
|
ClutterBackendPrivate *priv;
|
|
|
|
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), NULL);
|
|
|
|
priv = backend->priv;
|
|
|
|
if (G_LIKELY (priv->font_options))
|
|
return priv->font_options;
|
|
|
|
priv->font_options = cairo_font_options_create ();
|
|
|
|
cairo_font_options_set_hint_style (priv->font_options,
|
|
CAIRO_HINT_STYLE_NONE);
|
|
cairo_font_options_set_subpixel_order (priv->font_options,
|
|
CAIRO_SUBPIXEL_ORDER_DEFAULT);
|
|
cairo_font_options_set_antialias (priv->font_options,
|
|
CAIRO_ANTIALIAS_DEFAULT);
|
|
|
|
g_signal_emit (backend, backend_signals[FONT_CHANGED], 0);
|
|
|
|
return priv->font_options;
|
|
}
|
|
|
|
/**
|
|
* clutter_backend_set_font_name:
|
|
* @backend: a #ClutterBackend
|
|
* @font_name: the name of the font
|
|
*
|
|
* Sets the default font to be used by Clutter. The @font_name string
|
|
* must either be %NULL, which means that the font name from the
|
|
* default #ClutterBackend will be used; or be something that can
|
|
* be parsed by the pango_font_description_from_string() function.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
void
|
|
clutter_backend_set_font_name (ClutterBackend *backend,
|
|
const gchar *font_name)
|
|
{
|
|
ClutterBackendPrivate *priv;
|
|
|
|
g_return_if_fail (CLUTTER_IS_BACKEND (backend));
|
|
|
|
priv = backend->priv;
|
|
|
|
g_free (priv->font_name);
|
|
|
|
if (font_name == NULL || *font_name == '\0')
|
|
priv->font_name = g_strdup (DEFAULT_FONT_NAME);
|
|
else
|
|
priv->font_name = g_strdup (font_name);
|
|
|
|
g_signal_emit (backend, backend_signals[FONT_CHANGED], 0);
|
|
}
|
|
|
|
/**
|
|
* clutter_backend_get_font_name:
|
|
* @backend: a #ClutterBackend
|
|
*
|
|
* Retrieves the default font name as set by
|
|
* clutter_backend_set_font_name().
|
|
*
|
|
* Return value: the font name for the backend. The returned string is
|
|
* owned by the #ClutterBackend and should never be modified or freed
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
G_CONST_RETURN gchar *
|
|
clutter_backend_get_font_name (ClutterBackend *backend)
|
|
{
|
|
ClutterBackendPrivate *priv;
|
|
|
|
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), NULL);
|
|
|
|
priv = backend->priv;
|
|
|
|
if (G_LIKELY (priv->font_name))
|
|
return priv->font_name;
|
|
|
|
/* if we have never been called then we need to set the
|
|
* default font and update everything that relies on the
|
|
* ::font-changed signal
|
|
*/
|
|
priv->font_name = g_strdup (DEFAULT_FONT_NAME);
|
|
g_signal_emit (backend, backend_signals[FONT_CHANGED], 0);
|
|
|
|
return priv->font_name;
|
|
}
|
|
|
|
gint32
|
|
_clutter_backend_get_units_serial (ClutterBackend *backend)
|
|
{
|
|
g_return_val_if_fail (CLUTTER_IS_BACKEND (backend), 0);
|
|
|
|
return backend->priv->units_serial;
|
|
}
|