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13ac1fe75b
We should also warn if the glReadPixels happens to generate an ID that is within the range of the ID array but no longer points to an existing actor.
131 lines
3.5 KiB
C
131 lines
3.5 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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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 id;
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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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id = 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[id] = ptr;
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return id;
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}
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/* Allocate new id */
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id = id_pool->array->len;
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g_array_append_val (id_pool->array, ptr);
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return id;
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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] = (void*)0xdecafbad; /* set pointer to a recognizably voided
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value */
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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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