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/* gtd-animation-utils.c
*
* 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
*/
#include "gtd-animation-utils.h"
typedef struct
{
GType value_type;
GtdProgressFunc func;
} ProgressData;
G_LOCK_DEFINE_STATIC (progress_funcs);
static GHashTable *progress_funcs = NULL;
gboolean
gtd_has_progress_function (GType gtype)
{
const char *type_name = g_type_name (gtype);
if (progress_funcs == NULL)
return FALSE;
return g_hash_table_lookup (progress_funcs, type_name) != NULL;
}
gboolean
gtd_run_progress_function (GType gtype,
const GValue *initial,
const GValue *final,
gdouble progress,
GValue *retval)
{
ProgressData *pdata;
gboolean res;
G_LOCK (progress_funcs);
if (G_UNLIKELY (!progress_funcs))
{
res = FALSE;
goto out;
}
pdata = g_hash_table_lookup (progress_funcs, g_type_name (gtype));
if (G_UNLIKELY (!pdata))
{
res = FALSE;
goto out;
}
res = pdata->func (initial, final, progress, retval);
out:
G_UNLOCK (progress_funcs);
return res;
}
static void
progress_data_destroy (gpointer data)
{
g_free (data);
}
/**
* gtd_interval_register_progress_func: (skip)
* @value_type: a #GType
* @func: a #GtdProgressFunc, or %NULL to unset a previously
* set progress function
*
* Sets the progress function for a given @value_type, like:
*
* |[
* gtd_interval_register_progress_func (MY_TYPE_FOO,
* my_foo_progress);
* ]|
*
* Whenever a #GtdInterval instance using the default
* #GtdInterval::compute_value implementation is set as an
* interval between two #GValue of type @value_type, it will call
* @func to establish the value depending on the given progress,
* for instance:
*
* |[
* static gboolean
* my_int_progress (const GValue *a,
* const GValue *b,
* gdouble progress,
* GValue *retval)
* {
* gint ia = g_value_get_int (a);
* gint ib = g_value_get_int (b);
* gint res = factor * (ib - ia) + ia;
*
* g_value_set_int (retval, res);
*
* return TRUE;
* }
*
* gtd_interval_register_progress_func (G_TYPE_INT, my_int_progress);
* ]|
*
* To unset a previously set progress function of a #GType, pass %NULL
* for @func.
*
* Since: 1.0
*/
void
gtd_interval_register_progress_func (GType value_type,
GtdProgressFunc func)
{
ProgressData *progress_func;
const char *type_name;
g_return_if_fail (value_type != G_TYPE_INVALID);
type_name = g_type_name (value_type);
G_LOCK (progress_funcs);
if (G_UNLIKELY (!progress_funcs))
progress_funcs = g_hash_table_new_full (NULL, NULL, NULL, progress_data_destroy);
progress_func = g_hash_table_lookup (progress_funcs, type_name);
if (G_UNLIKELY (progress_func))
{
if (func == NULL)
{
g_hash_table_remove (progress_funcs, type_name);
g_free (progress_func);
}
else
{
progress_func->func = func;
}
}
else
{
progress_func = g_new0 (ProgressData, 1);
progress_func->value_type = value_type;
progress_func->func = func;
g_hash_table_replace (progress_funcs,
(gpointer) type_name,
progress_func);
}
G_UNLOCK (progress_funcs);
}
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