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/* gtd-animation-utils.h
*
* Copyright 2020 Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#pragma once
#include <glib-object.h>
G_BEGIN_DECLS
/**
* GtdProgressFunc:
* @a: the initial value of an interval
* @b: the final value of an interval
* @progress: the progress factor, between 0 and 1
* @retval: the value used to store the progress
*
* Prototype of the progress function used to compute the value
* between the two ends @a and @b of an interval depending on
* the value of @progress.
*
* The #GValue in @retval is already initialized with the same
* type as @a and @b.
*
* This function will be called by #GtdInterval if the
* type of the values of the interval was registered using
* gtd_interval_register_progress_func().
*
* Return value: %TRUE if the function successfully computed
* the value and stored it inside @retval
*/
typedef gboolean (* GtdProgressFunc) (const GValue *a,
const GValue *b,
gdouble progress,
GValue *retval);
void gtd_interval_register_progress_func (GType value_type,
GtdProgressFunc func);
gboolean gtd_has_progress_function (GType gtype);
gboolean gtd_run_progress_function (GType gtype,
const GValue *initial,
const GValue *final,
gdouble progress,
GValue *retval);
G_END_DECLS
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