pipeline: Split more code out from cogl-pipeline.c

This splits out the core CoglPipelineLayer support code from
cogl-pipeline.c into cogl-pipeline-layer.c; it splits out the debugging
code for dumping a pipeline to a .dot file into cogl-pipeline-debug.c
and it splits the CoglPipelineNode support which is shared between
CoglPipeline and CoglPipelineLayer into cogl-node.c.

Note: cogl-pipeline-layer.c only contains the layer code directly
relating to CoglPipelineLayer objects; it does not contain any
_cogl_pipeline API relating to how CoglPipeline tracks and manipulates
layers.

1 files changed, 103 insertions, 0 deletions

diff --git a/cogl/cogl-node.c b/cogl/cogl-node.c
new file mode 100644
index 00000000..46112f38
--- /dev/null
+++ b/cogl/cogl-node.c
@@ -0,0 +1,103 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2008,2009,2010 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ *
+ *
+ * Authors:
+ *   Robert Bragg <robert@linux.intel.com>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#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,
+                                     gboolean 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_HEAD (&parent->children, node, list_node);
+
+  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;
+
+  g_return_if_fail (!COGL_LIST_EMPTY (&parent->children));
+
+  COGL_LIST_REMOVE (node, list_node);
+
+  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_FOREACH_SAFE (child, &node->children, list_node, next)
+    callback (child, user_data);
+}
+
+