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130 lines
3.3 KiB
C
130 lines
3.3 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) 2006-2008 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, see <http://www.gnu.org/licenses/>.
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*
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*
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*
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* ClutterIDPool: pool of reusable integer ids associated with pointers.
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*
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* Author: Øyvind Kolås <pippin@o-hand-com>
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*
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*/
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#include "clutter-build-config.h"
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#include "clutter-debug.h"
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#include "clutter-id-pool.h"
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struct _ClutterIDPool
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{
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GArray *array; /* Array of pointers */
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GSList *free_ids; /* A stack of freed ids */
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};
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ClutterIDPool *
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_clutter_id_pool_new (guint initial_size)
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{
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ClutterIDPool *self;
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self = g_slice_new (ClutterIDPool);
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self->array = g_array_sized_new (FALSE, FALSE,
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sizeof (gpointer), initial_size);
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self->free_ids = NULL;
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return self;
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}
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void
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_clutter_id_pool_free (ClutterIDPool *id_pool)
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{
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g_return_if_fail (id_pool != NULL);
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g_array_free (id_pool->array, TRUE);
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g_slist_free (id_pool->free_ids);
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g_slice_free (ClutterIDPool, id_pool);
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}
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guint32
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_clutter_id_pool_add (ClutterIDPool *id_pool,
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gpointer ptr)
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{
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gpointer *array;
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guint32 retval;
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g_return_val_if_fail (id_pool != NULL, 0);
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if (id_pool->free_ids) /* There are items on our freelist, reuse one */
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{
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array = (void*) id_pool->array->data;
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retval = GPOINTER_TO_UINT (id_pool->free_ids->data);
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id_pool->free_ids = g_slist_remove (id_pool->free_ids,
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id_pool->free_ids->data);
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array[retval] = ptr;
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return retval;
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}
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/* Allocate new id */
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retval = id_pool->array->len;
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g_array_append_val (id_pool->array, ptr);
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return retval;
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}
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void
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_clutter_id_pool_remove (ClutterIDPool *id_pool,
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guint32 id_)
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{
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gpointer *array;
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g_return_if_fail (id_pool != NULL);
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array = (void*) id_pool->array->data;
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array[id_] = NULL;
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id_pool->free_ids = g_slist_prepend (id_pool->free_ids,
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GUINT_TO_POINTER (id_));
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}
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gpointer
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_clutter_id_pool_lookup (ClutterIDPool *id_pool,
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guint32 id_)
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{
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gpointer *array;
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g_return_val_if_fail (id_pool != NULL, NULL);
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g_return_val_if_fail (id_pool->array != NULL, NULL);
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array = (void*) id_pool->array->data;
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if (id_ >= id_pool->array->len || array[id_] == NULL)
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{
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g_warning ("The required ID of %u does not refer to an existing actor; "
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"this usually implies that the pick() of an actor is not "
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"correctly implemented or that there is an error in the "
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"glReadPixels() implementation of the GL driver.", id_);
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return NULL;
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}
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return array[id_];
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}
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