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material-node: track if node owns reference on parent

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MaterialNodes are used for the sparse graph of material state and layer
state. In the case of materials there is the idea of weak materials that
don't take a reference on their parent and in that case we need to be
careful not to unref our parent during
_cogl_material_node_unparent_real. This adds a has_parent_reference
member to the CoglMaterialNode struct so we now know when to skip the
unref.
This commit is contained in:
Robert Bragg 2010-10-26 17:43:16 +01:00
parent 7927aed5d6
commit 8f15f63212
2 changed files with 7 additions and 1 deletions
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4
cogl/cogl-material-private.h
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@ -138,6 +138,10 @@ struct _CoglMaterialNode
/* The parent material/layer */
CoglMaterialNode *parent;
/* TRUE if the node took a strong reference on its parent. Weak
* materials for instance don't take a reference on their parent. */
gboolean has_parent_reference;
/* As an optimization for creating leaf node materials/layers (the
* most common) we don't require any list node allocations to link
* to a single descendant. */

4
cogl/cogl-material.c
View File

@ -127,6 +127,7 @@ _cogl_material_node_set_parent_real (CoglMaterialNode *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
@ -160,7 +161,8 @@ _cogl_material_node_unparent_real (CoglMaterialNode *node)
else
parent->children = g_list_remove (parent->children, node);
cogl_object_unref (parent);
if (node->has_parent_reference)
cogl_object_unref (parent);
node->parent = NULL;
}