void
gegl_operation_context_destroy (GeglOperationContext *self)
{
gegl_operation_context_purge (self);
g_slice_free (GeglOperationContext, self);
}
/**
* gegl_graph_process:
* @path: The traversal path
*
* Process the prepared request. This will return the
* resulting buffer from the final node, or NULL if
* that node is a sink.
*
* If gegl_graph_prepare_request has not been called
* the behavior of this function is undefined.
*
* Return value: (transfer full): The result of the graph, or NULL if
* there is no output pad.
*/
GeglBuffer *
gegl_graph_process (GeglGraphTraversal *path,
gint level)
{
GList *list_iter = NULL;
GeglBuffer *result = NULL;
GeglOperationContext *context = NULL;
GeglOperationContext *last_context = NULL;
GeglBuffer *operation_result = NULL;
for (list_iter = path->dfs_path; list_iter; list_iter = list_iter->next)
{
GeglNode *node = GEGL_NODE (list_iter->data);
GeglOperation *operation = node->operation;
g_return_val_if_fail (node, NULL);
g_return_val_if_fail (operation, NULL);
GEGL_INSTRUMENT_START();
operation_result = NULL;
if (last_context)
gegl_operation_context_purge (last_context);
context = g_hash_table_lookup (path->contexts, node);
g_return_val_if_fail (context, NULL);
GEGL_NOTE (GEGL_DEBUG_PROCESS,
"Will process %s result_rect = %d, %d %d×%d",
gegl_node_get_debug_name (node),
context->result_rect.x, context->result_rect.y, context->result_rect.width, context->result_rect.height);
if (context->need_rect.width > 0 && context->need_rect.height > 0)
{
if (context->cached)
{
GEGL_NOTE (GEGL_DEBUG_PROCESS,
"Using cached result for %s",
gegl_node_get_debug_name (node));
operation_result = GEGL_BUFFER (node->cache);
}
else
{
/* provide something on input pad, always - this makes having
behavior depending on it not being set.. not work, is
sacrifising that worth it?
*/
if (gegl_node_has_pad (node, "input") &&
!gegl_operation_context_get_object (context, "input"))
{
gegl_operation_context_set_object (context, "input", G_OBJECT (gegl_graph_get_shared_empty(path)));
}
context->level = level;
/* note: this hard-coding of "output" makes some more custom
* graph topologies harder than neccesary.
*/
gegl_operation_process (operation, context, "output", &context->need_rect, context->level);
operation_result = GEGL_BUFFER (gegl_operation_context_get_object (context, "output"));
if (operation_result && operation_result == (GeglBuffer *)operation->node->cache)
gegl_cache_computed (operation->node->cache, &context->need_rect, level);
}
}
else
{
operation_result = NULL;
}
if (operation_result)
{
GeglPad *output_pad = gegl_node_get_pad (node, "output");
GList *targets = gegl_graph_get_connected_output_contexts (path, output_pad);
GList *targets_iter;
GEGL_NOTE (GEGL_DEBUG_PROCESS,
"Will deliver the results of %s:%s to %d targets",
gegl_node_get_debug_name (node),
"output",
g_list_length (targets));
if (g_list_length (targets) > 1)
gegl_object_set_has_forked (G_OBJECT (operation_result));
for (targets_iter = targets; targets_iter; targets_iter = g_list_next (targets_iter))
{
ContextConnection *target_con = targets_iter->data;
gegl_operation_context_set_object (target_con->context, target_con->name, G_OBJECT (operation_result));
}
g_list_free_full (targets, free_context_connection);
}
last_context = context;
GEGL_INSTRUMENT_END ("process", gegl_node_get_operation (node));
}
if (last_context)
{
if (operation_result)
result = g_object_ref (operation_result);
else if (gegl_node_has_pad (last_context->operation->node, "output"))
result = g_object_ref (gegl_graph_get_shared_empty (path));
gegl_operation_context_purge (last_context);
}
return result;
}