/* * Clutter. * * An OpenGL based 'interactive canvas' library. * * Authored By Matthew Allum * Jorn Baayen * Emmanuele Bassi * Tomas Frydrych * * Copyright (C) 2006, 2007, 2008 OpenedHand * Copyright (C) 2009, 2010 Intel Corp. * * 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 . */ /** * SECTION:clutter-alpha * @short_description: A class for calculating a value as a function of time * * #ClutterAlpha is a class for calculating an floating point value * dependent only on the position of a #ClutterTimeline. * * For newly written code, it is recommended to use the * #ClutterTimeline:progress-mode property of #ClutterTimeline, or the * clutter_timeline_set_progress_func() function instead of #ClutterAlpha. * The #ClutterAlpha class will be deprecated in the future, and will not * be available any more in the next major version of Clutter. * * A #ClutterAlpha binds a #ClutterTimeline to a progress function which * translates the time T into an adimensional factor alpha. The factor can * then be used to drive a #ClutterBehaviour, which will translate the * alpha value into something meaningful for a #ClutterActor. * * You should provide a #ClutterTimeline and bind it to the #ClutterAlpha * instance using clutter_alpha_set_timeline(). You should also set an * "animation mode", either by using the #ClutterAnimationMode values that * Clutter itself provides or by registering custom functions using * clutter_alpha_register_func(). * * Instead of a #ClutterAnimationMode you may provide a function returning * the alpha value depending on the progress of the timeline, using * clutter_alpha_set_func() or clutter_alpha_set_closure(). The alpha * function will be executed each time a new frame in the #ClutterTimeline * is reached. * * Since the alpha function is controlled by the timeline instance, you can * pause, stop or resume the #ClutterAlpha from calling the alpha function by * using the appropriate functions of the #ClutterTimeline object. * * #ClutterAlpha is used to "drive" a #ClutterBehaviour instance, and it * is internally used by the #ClutterAnimation API. * * * ClutterAlpha custom properties for #ClutterScript * #ClutterAlpha defines a custom "function" property for * #ClutterScript which allows to reference a custom alpha function * available in the source code. Setting the "function" property * is equivalent to calling clutter_alpha_set_func() with the * specified function name. No user data or #GDestroyNotify is * available to be passed. * * Defining a ClutterAlpha in ClutterScript * The following JSON fragment defines a #ClutterAlpha * using a #ClutterTimeline with id "sine-timeline" and an alpha * function called my_sine_alpha. The defined * #ClutterAlpha instance can be reused in multiple #ClutterBehaviour * definitions or for #ClutterAnimation definitions. * * * For the way to define the #ClutterAlpha:mode property * inside a ClutterScript fragment, see the corresponding section * in #ClutterAnimation. * * * #ClutterAlpha is available since Clutter 0.2. * * #ClutterAlpha is deprecated since Clutter 1.12; use #ClutterTimeline and the * #ClutterTimeline:progress-mode property. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #define CLUTTER_DISABLE_DEPRECATION_WARNINGS #include "clutter-alpha.h" #include "clutter-debug.h" #include "clutter-enum-types.h" #include "clutter-easing.h" #include "clutter-main.h" #include "clutter-marshal.h" #include "clutter-private.h" #include "clutter-scriptable.h" #include "clutter-script-private.h" struct _ClutterAlphaPrivate { ClutterTimeline *timeline; guint timeline_new_frame_id; gdouble alpha; GClosure *closure; ClutterAlphaFunc func; gpointer user_data; GDestroyNotify notify; gulong mode; }; enum { PROP_0, PROP_TIMELINE, PROP_ALPHA, PROP_MODE, PROP_LAST }; static GParamSpec *obj_props[PROP_LAST]; static void clutter_scriptable_iface_init (ClutterScriptableIface *iface); G_DEFINE_TYPE_WITH_CODE (ClutterAlpha, clutter_alpha, G_TYPE_INITIALLY_UNOWNED, G_ADD_PRIVATE (ClutterAlpha) G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_SCRIPTABLE, clutter_scriptable_iface_init)); static void timeline_new_frame_cb (ClutterTimeline *timeline, guint msecs, ClutterAlpha *alpha) { ClutterAlphaPrivate *priv = alpha->priv; /* Update alpha value and notify */ priv->alpha = clutter_alpha_get_alpha (alpha); g_object_notify_by_pspec (G_OBJECT (alpha), obj_props[PROP_ALPHA]); } static void clutter_alpha_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { ClutterAlpha *alpha = CLUTTER_ALPHA (object); switch (prop_id) { case PROP_TIMELINE: clutter_alpha_set_timeline (alpha, g_value_get_object (value)); break; case PROP_MODE: clutter_alpha_set_mode (alpha, g_value_get_ulong (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void clutter_alpha_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { ClutterAlphaPrivate *priv = CLUTTER_ALPHA (object)->priv; switch (prop_id) { case PROP_TIMELINE: g_value_set_object (value, priv->timeline); break; case PROP_ALPHA: g_value_set_double (value, priv->alpha); break; case PROP_MODE: g_value_set_ulong (value, priv->mode); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void clutter_alpha_finalize (GObject *object) { ClutterAlphaPrivate *priv = CLUTTER_ALPHA (object)->priv; if (priv->notify != NULL) priv->notify (priv->user_data); else if (priv->closure != NULL) g_closure_unref (priv->closure); G_OBJECT_CLASS (clutter_alpha_parent_class)->finalize (object); } static void clutter_alpha_dispose (GObject *object) { ClutterAlpha *self = CLUTTER_ALPHA(object); clutter_alpha_set_timeline (self, NULL); G_OBJECT_CLASS (clutter_alpha_parent_class)->dispose (object); } static ClutterAlphaFunc resolve_alpha_func (const gchar *name) { static GModule *module = NULL; ClutterAlphaFunc func; CLUTTER_NOTE (SCRIPT, "Looking up '%s' alpha function", name); if (G_UNLIKELY (module == NULL)) module = g_module_open (NULL, 0); if (g_module_symbol (module, name, (gpointer) &func)) { CLUTTER_NOTE (SCRIPT, "Found '%s' alpha function in the symbols table", name); return func; } return NULL; } static void clutter_alpha_set_custom_property (ClutterScriptable *scriptable, ClutterScript *script, const gchar *name, const GValue *value) { if (strncmp (name, "function", 8) == 0) { g_assert (G_VALUE_HOLDS (value, G_TYPE_POINTER)); if (g_value_get_pointer (value) != NULL) { clutter_alpha_set_func (CLUTTER_ALPHA (scriptable), g_value_get_pointer (value), NULL, NULL); } } else g_object_set_property (G_OBJECT (scriptable), name, value); } static gboolean clutter_alpha_parse_custom_node (ClutterScriptable *scriptable, ClutterScript *script, GValue *value, const gchar *name, JsonNode *node) { if (strncmp (name, "function", 8) == 0) { const gchar *func_name = json_node_get_string (node); g_value_init (value, G_TYPE_POINTER); g_value_set_pointer (value, resolve_alpha_func (func_name)); return TRUE; } /* we need to do this because we use gulong in place * of ClutterAnimationMode for ClutterAlpha:mode */ if (strncmp (name, "mode", 4) == 0) { gulong mode; mode = _clutter_script_resolve_animation_mode (node); g_value_init (value, G_TYPE_ULONG); g_value_set_ulong (value, mode); return TRUE; } return FALSE; } static void clutter_scriptable_iface_init (ClutterScriptableIface *iface) { iface->parse_custom_node = clutter_alpha_parse_custom_node; iface->set_custom_property = clutter_alpha_set_custom_property; } static void clutter_alpha_class_init (ClutterAlphaClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); object_class->set_property = clutter_alpha_set_property; object_class->get_property = clutter_alpha_get_property; object_class->finalize = clutter_alpha_finalize; object_class->dispose = clutter_alpha_dispose; /** * ClutterAlpha:timeline: * * A #ClutterTimeline instance used to drive the alpha function. * * Since: 0.2 * * Deprecated: 1.12 */ obj_props[PROP_TIMELINE] = g_param_spec_object ("timeline", P_("Timeline"), P_("Timeline used by the alpha"), CLUTTER_TYPE_TIMELINE, CLUTTER_PARAM_READWRITE); /** * ClutterAlpha:alpha: * * The alpha value as computed by the alpha function. The linear * interval is 0.0 to 1.0, but the Alpha allows overshooting by * one unit in each direction, so the valid interval is -1.0 to 2.0. * * Since: 0.2 * Deprecated: 1.12 */ obj_props[PROP_ALPHA] = g_param_spec_double ("alpha", P_("Alpha value"), P_("Alpha value as computed by the alpha"), -1.0, 2.0, 0.0, CLUTTER_PARAM_READABLE); /** * ClutterAlpha:mode: * * The progress function logical id - either a value from the * #ClutterAnimationMode enumeration or a value returned by * clutter_alpha_register_func(). * * If %CLUTTER_CUSTOM_MODE is used then the function set using * clutter_alpha_set_closure() or clutter_alpha_set_func() * will be used. * * Since: 1.0 * Deprecated: 1.12 */ obj_props[PROP_MODE] = g_param_spec_ulong ("mode", P_("Mode"), P_("Progress mode"), 0, G_MAXULONG, CLUTTER_CUSTOM_MODE, G_PARAM_CONSTRUCT | CLUTTER_PARAM_READWRITE); g_object_class_install_properties (object_class, PROP_LAST, obj_props); } static void clutter_alpha_init (ClutterAlpha *self) { self->priv = clutter_alpha_get_instance_private (self); self->priv->mode = CLUTTER_CUSTOM_MODE; self->priv->alpha = 0.0; } /** * clutter_alpha_get_alpha: * @alpha: A #ClutterAlpha * * Query the current alpha value. * * Return Value: The current alpha value for the alpha * * Since: 0.2 * * Deprecated: 1.12 */ gdouble clutter_alpha_get_alpha (ClutterAlpha *alpha) { ClutterAlphaPrivate *priv; gdouble retval = 0; g_return_val_if_fail (CLUTTER_IS_ALPHA (alpha), 0); priv = alpha->priv; if (G_LIKELY (priv->func)) { return priv->func (alpha, priv->user_data); } else if (priv->closure) { GValue params = G_VALUE_INIT; GValue result_value = G_VALUE_INIT; g_object_ref (alpha); g_value_init (&result_value, G_TYPE_DOUBLE); g_value_init (¶ms, CLUTTER_TYPE_ALPHA); g_value_set_object (¶ms, alpha); g_closure_invoke (priv->closure, &result_value, 1, ¶ms, NULL); retval = g_value_get_double (&result_value); g_value_unset (&result_value); g_value_unset (¶ms); g_object_unref (alpha); } return retval; } /* * clutter_alpha_set_closure_internal: * @alpha: a #ClutterAlpha * @closure: a #GClosure * * Sets the @closure for @alpha. This function does not * set the #ClutterAlpha:mode property and does not emit * the #GObject::notify signal for it. */ static inline void clutter_alpha_set_closure_internal (ClutterAlpha *alpha, GClosure *closure) { ClutterAlphaPrivate *priv = alpha->priv; if (priv->notify != NULL) priv->notify (priv->user_data); else if (priv->closure != NULL) g_closure_unref (priv->closure); priv->func = NULL; priv->user_data = NULL; priv->notify = NULL; if (closure == NULL) return; /* need to take ownership of the closure before sinking it */ priv->closure = g_closure_ref (closure); g_closure_sink (closure); /* set the marshaller */ if (G_CLOSURE_NEEDS_MARSHAL (closure)) { GClosureMarshal marshal = _clutter_marshal_DOUBLE__VOID; g_closure_set_marshal (priv->closure, marshal); } } /** * clutter_alpha_set_closure: * @alpha: A #ClutterAlpha * @closure: A #GClosure * * Sets the #GClosure used to compute the alpha value at each * frame of the #ClutterTimeline bound to @alpha. * * Since: 0.8 * * Deprecated: 1.12 */ void clutter_alpha_set_closure (ClutterAlpha *alpha, GClosure *closure) { ClutterAlphaPrivate *priv; g_return_if_fail (CLUTTER_IS_ALPHA (alpha)); g_return_if_fail (closure != NULL); priv = alpha->priv; clutter_alpha_set_closure_internal (alpha, closure); priv->mode = CLUTTER_CUSTOM_MODE; g_object_notify_by_pspec (G_OBJECT (alpha), obj_props[PROP_MODE]); } /** * clutter_alpha_set_func: * @alpha: A #ClutterAlpha * @func: A #ClutterAlphaFunc * @data: user data to be passed to the alpha function, or %NULL * @destroy: notify function used when disposing the alpha function * * Sets the #ClutterAlphaFunc function used to compute * the alpha value at each frame of the #ClutterTimeline * bound to @alpha. * * This function will not register @func as a global alpha function. * * Since: 0.2 * * Deprecated: 1.12 */ void clutter_alpha_set_func (ClutterAlpha *alpha, ClutterAlphaFunc func, gpointer data, GDestroyNotify destroy) { ClutterAlphaPrivate *priv; g_return_if_fail (CLUTTER_IS_ALPHA (alpha)); g_return_if_fail (func != NULL); priv = alpha->priv; if (priv->notify != NULL) { priv->notify (priv->user_data); } else if (priv->closure != NULL) { g_closure_unref (priv->closure); priv->closure = NULL; } priv->func = func; priv->user_data = data; priv->notify = destroy; priv->mode = CLUTTER_CUSTOM_MODE; g_object_notify_by_pspec (G_OBJECT (alpha), obj_props[PROP_MODE]); } /** * clutter_alpha_set_timeline: * @alpha: A #ClutterAlpha * @timeline: A #ClutterTimeline * * Binds @alpha to @timeline. * * Since: 0.2 * * Deprecated: 1.12 */ void clutter_alpha_set_timeline (ClutterAlpha *alpha, ClutterTimeline *timeline) { ClutterAlphaPrivate *priv; g_return_if_fail (CLUTTER_IS_ALPHA (alpha)); g_return_if_fail (timeline == NULL || CLUTTER_IS_TIMELINE (timeline)); priv = alpha->priv; if (priv->timeline == timeline) return; if (priv->timeline) { g_signal_handlers_disconnect_by_func (priv->timeline, timeline_new_frame_cb, alpha); g_object_unref (priv->timeline); priv->timeline = NULL; } if (timeline) { priv->timeline = g_object_ref (timeline); g_signal_connect (priv->timeline, "new-frame", G_CALLBACK (timeline_new_frame_cb), alpha); } g_object_notify_by_pspec (G_OBJECT (alpha), obj_props[PROP_TIMELINE]); } /** * clutter_alpha_get_timeline: * @alpha: A #ClutterAlpha * * Gets the #ClutterTimeline bound to @alpha. * * Return value: (transfer none): a #ClutterTimeline instance * * Since: 0.2 * * Deprecated: 1.12 */ ClutterTimeline * clutter_alpha_get_timeline (ClutterAlpha *alpha) { g_return_val_if_fail (CLUTTER_IS_ALPHA (alpha), NULL); return alpha->priv->timeline; } /** * clutter_alpha_new: * * Creates a new #ClutterAlpha instance. You must set a function * to compute the alpha value using clutter_alpha_set_func() and * bind a #ClutterTimeline object to the #ClutterAlpha instance * using clutter_alpha_set_timeline(). * * You should use the newly created #ClutterAlpha instance inside * a #ClutterBehaviour object. * * Return value: the newly created empty #ClutterAlpha instance. * * Since: 0.2 * * Deprecated: 1.12 */ ClutterAlpha * clutter_alpha_new (void) { return g_object_new (CLUTTER_TYPE_ALPHA, NULL); } /** * clutter_alpha_new_full: * @timeline: #ClutterTimeline timeline * @mode: animation mode * * Creates a new #ClutterAlpha instance and sets the timeline * and animation mode. * * See also clutter_alpha_set_timeline() and clutter_alpha_set_mode(). * * Return Value: the newly created #ClutterAlpha * * Since: 1.0 * * Deprecated: 1.12 */ ClutterAlpha * clutter_alpha_new_full (ClutterTimeline *timeline, gulong mode) { g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), NULL); g_return_val_if_fail (mode != CLUTTER_ANIMATION_LAST, NULL); return g_object_new (CLUTTER_TYPE_ALPHA, "timeline", timeline, "mode", mode, NULL); } /** * clutter_alpha_new_with_func: * @timeline: a #ClutterTimeline * @func: a #ClutterAlphaFunc * @data: data to pass to the function, or %NULL * @destroy: function to call when removing the alpha function, or %NULL * * Creates a new #ClutterAlpha instances and sets the timeline * and the alpha function. * * This function will not register @func as a global alpha function. * * See also clutter_alpha_set_timeline() and clutter_alpha_set_func(). * * Return value: the newly created #ClutterAlpha * * Since: 1.0 * * Deprecated: 1.12 */ ClutterAlpha * clutter_alpha_new_with_func (ClutterTimeline *timeline, ClutterAlphaFunc func, gpointer data, GDestroyNotify destroy) { ClutterAlpha *retval; g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), NULL); g_return_val_if_fail (func != NULL, NULL); retval = clutter_alpha_new (); clutter_alpha_set_timeline (retval, timeline); clutter_alpha_set_func (retval, func, data, destroy); return retval; } /** * clutter_alpha_get_mode: * @alpha: a #ClutterAlpha * * Retrieves the #ClutterAnimationMode used by @alpha. * * Return value: the animation mode * * Since: 1.0 * * Deprecated: 1.12 */ gulong clutter_alpha_get_mode (ClutterAlpha *alpha) { g_return_val_if_fail (CLUTTER_IS_ALPHA (alpha), CLUTTER_CUSTOM_MODE); return alpha->priv->mode; } typedef struct _AlphaData { guint closure_set : 1; ClutterAlphaFunc func; gpointer data; GClosure *closure; } AlphaData; static GPtrArray *clutter_alphas = NULL; static gdouble clutter_alpha_easing_func (ClutterAlpha *alpha, gpointer data G_GNUC_UNUSED) { ClutterAlphaPrivate *priv = alpha->priv; ClutterTimeline *timeline = priv->timeline; gdouble t, d; if (G_UNLIKELY (priv->timeline == NULL)) return 0.0; t = clutter_timeline_get_elapsed_time (timeline); d = clutter_timeline_get_duration (timeline); return clutter_easing_for_mode (priv->mode, t, d); } /** * clutter_alpha_set_mode: * @alpha: a #ClutterAlpha * @mode: a #ClutterAnimationMode * * Sets the progress function of @alpha using the symbolic value * of @mode, as taken by the #ClutterAnimationMode enumeration or * using the value returned by clutter_alpha_register_func(). * * Since: 1.0 * * Deprecated: 1.12 */ void clutter_alpha_set_mode (ClutterAlpha *alpha, gulong mode) { ClutterAlphaPrivate *priv; g_return_if_fail (CLUTTER_IS_ALPHA (alpha)); g_return_if_fail (mode != CLUTTER_ANIMATION_LAST); priv = alpha->priv; if (mode == CLUTTER_CUSTOM_MODE) { priv->mode = mode; } else if (mode < CLUTTER_ANIMATION_LAST) { if (priv->mode == mode) return; /* sanity check to avoid getting an out of sync * enum/function mapping */ g_assert (clutter_get_easing_func_for_mode (mode) != NULL); clutter_alpha_set_closure_internal (alpha, NULL); priv->mode = mode; CLUTTER_NOTE (ANIMATION, "New easing mode '%s'[%lu]\n", clutter_get_easing_name_for_mode (priv->mode), priv->mode); priv->func = clutter_alpha_easing_func; priv->user_data = NULL; priv->notify = NULL; } else if (mode > CLUTTER_ANIMATION_LAST) { AlphaData *alpha_data = NULL; gulong real_index = 0; if (priv->mode == mode) return; if (G_UNLIKELY (clutter_alphas == NULL)) { g_warning ("No alpha functions defined for ClutterAlpha to use. " "Use clutter_alpha_register_func() to register an " "alpha function."); return; } real_index = mode - CLUTTER_ANIMATION_LAST - 1; alpha_data = g_ptr_array_index (clutter_alphas, real_index); if (G_UNLIKELY (alpha_data == NULL)) { g_warning ("No alpha function registered for mode %lu.", mode); return; } if (alpha_data->closure_set) clutter_alpha_set_closure (alpha, alpha_data->closure); else { clutter_alpha_set_closure_internal (alpha, NULL); priv->func = alpha_data->func; priv->user_data = alpha_data->data; priv->notify = NULL; } priv->mode = mode; } else g_assert_not_reached (); g_object_notify_by_pspec (G_OBJECT (alpha), obj_props[PROP_MODE]); } static gulong register_alpha_internal (AlphaData *alpha_data) { if (G_UNLIKELY (clutter_alphas == NULL)) clutter_alphas = g_ptr_array_new (); g_ptr_array_add (clutter_alphas, alpha_data); return clutter_alphas->len + CLUTTER_ANIMATION_LAST; } /** * clutter_alpha_register_func: (skip) * @func: a #ClutterAlphaFunc * @data: user data to pass to @func, or %NULL * * Registers a global alpha function and returns its logical id * to be used by clutter_alpha_set_mode() or by #ClutterAnimation. * * The logical id is always greater than %CLUTTER_ANIMATION_LAST. * * Return value: the logical id of the alpha function * * Since: 1.0 * * Deprecated: 1.12 */ gulong clutter_alpha_register_func (ClutterAlphaFunc func, gpointer data) { AlphaData *alpha_data; g_return_val_if_fail (func != NULL, 0); alpha_data = g_slice_new (AlphaData); alpha_data->closure_set = FALSE; alpha_data->func = func; alpha_data->data = data; return register_alpha_internal (alpha_data); } /** * clutter_alpha_register_closure: * @closure: a #GClosure * * #GClosure variant of clutter_alpha_register_func(). * * Registers a global alpha function and returns its logical id * to be used by clutter_alpha_set_mode() or by #ClutterAnimation. * * The logical id is always greater than %CLUTTER_ANIMATION_LAST. * * Rename to: clutter_alpha_register_func * * Return value: the logical id of the alpha function * * Since: 1.0 * * Deprecated: 1.12 */ gulong clutter_alpha_register_closure (GClosure *closure) { AlphaData *alpha_data; g_return_val_if_fail (closure != NULL, 0); alpha_data = g_slice_new (AlphaData); alpha_data->closure_set = TRUE; alpha_data->closure = closure; return register_alpha_internal (alpha_data); }