+ // Output the current graph to the given file in a Graphviz-compatible format;
+ // only useful for debugging.
+ void output_dot(const char *filename);
+ std::vector<std::string> get_labels_for_edge(const Node *from, const Node *to);
+ void output_dot_edge(FILE *fp,
+ const std::string &from_node_id,
+ const std::string &to_node_id,
+ const std::vector<std::string> &labels);
+
+ // Some of the graph algorithms assume that the nodes array is sorted
+ // topologically (inputs are always before outputs), but some operations
+ // (like graph rewriting) can change that. This function restores that order.
+ void sort_all_nodes_topologically();
+
+ // Do the actual topological sort. <nodes> must be a connected, acyclic subgraph;
+ // links that go to nodes not in the set will be ignored.
+ std::vector<Node *> topological_sort(const std::vector<Node *> &nodes);
+
+ // Utility function used by topological_sort() to do a depth-first search.
+ // The reason why we store nodes left to visit instead of a more conventional
+ // list of nodes to visit is that we want to be able to limit ourselves to
+ // a subgraph instead of all nodes. The set thus serves a dual purpose.
+ void topological_sort_visit_node(Node *node, std::set<Node *> *nodes_left_to_visit, std::vector<Node *> *sorted_list);
+
+ // Used during finalize().
+ void find_color_spaces_for_inputs();
+ void propagate_alpha();
+ void propagate_gamma_and_color_space();
+ Node *find_output_node();
+
+ bool node_needs_colorspace_fix(Node *node);
+ void fix_internal_color_spaces();
+ void fix_output_color_space();
+
+ bool node_needs_alpha_fix(Node *node);
+ void fix_internal_alpha(unsigned step);
+ void fix_output_alpha();
+
+ bool node_needs_gamma_fix(Node *node);
+ void fix_internal_gamma_by_asking_inputs(unsigned step);
+ void fix_internal_gamma_by_inserting_nodes(unsigned step);
+ void fix_output_gamma();
+ void add_dither_if_needed();
+
+ float aspect_nom, aspect_denom;