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/*
* Cogl
*
* A Low-Level GPU Graphics and Utilities API
*
* Copyright (C) 2008,2009,2010 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-util.h"
#include "cogl-node-private.h"
void
_cogl_pipeline_node_init (CoglNode *node)
{
node->parent = NULL;
_cogl_list_init (&node->children);
}
void
_cogl_pipeline_node_set_parent_real (CoglNode *node,
CoglNode *parent,
CoglNodeUnparentVFunc unparent,
CoglBool take_strong_reference)
{
/* NB: the old parent may indirectly be keeping the new parent alive
* so we have to ref the new parent before unrefing the old.
*
* Note: we take a reference here regardless of
* take_strong_reference because weak children may need special
* handling when the parent disposes itself which relies on a
* consistent link to all weak nodes. Once the node is linked to its
* parent then we remove the reference at the end if
* take_strong_reference == FALSE. */
cogl_object_ref (parent);
if (node->parent)
unparent (node);
_cogl_list_insert (&parent->children, &node->link);
node->parent = parent;
node->has_parent_reference = take_strong_reference;
/* Now that there is a consistent parent->child link we can remove
* the parent reference if no reference was requested. If it turns
* out that the new parent was only being kept alive by the old
* parent then it will be disposed of here. */
if (!take_strong_reference)
cogl_object_unref (parent);
}
void
_cogl_pipeline_node_unparent_real (CoglNode *node)
{
CoglNode *parent = node->parent;
if (parent == NULL)
return;
_COGL_RETURN_IF_FAIL (!_cogl_list_empty (&parent->children));
_cogl_list_remove (&node->link);
if (node->has_parent_reference)
cogl_object_unref (parent);
node->parent = NULL;
}
void
_cogl_pipeline_node_foreach_child (CoglNode *node,
CoglNodeChildCallback callback,
void *user_data)
{
CoglNode *child, *next;
_cogl_list_for_each_safe (child, next, &node->children, link)
callback (child, user_data);
}
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