gegl r3051 - in trunk: . docs gegl

[martinn svn gnome org]

Author: martinn
Date: Sun Apr 12 11:40:02 2009
New Revision: 3051
URL: http://svn.gnome.org/viewvc/gegl?rev=3051&view=rev

Log:
gegl: Add gegl_dot_node_to_png()

Add gegl_dot_node_to_png() which is a debug function supposed to be
called directly from a debugger. E.g. in gdb it is used like this:

  p gegl_dot_node_to_png (node, "/tmp/foo.png")

where 'node' is a node of interest. That will show the graphviz graph
of 'node' and its dependencies.

Modified:
   trunk/ChangeLog
   trunk/docs/development.txt
   trunk/gegl/gegl-dot.c
   trunk/gegl/gegl-dot.h

Modified: trunk/docs/development.txt
==============================================================================
--- trunk/docs/development.txt	(original)
+++ trunk/docs/development.txt	Sun Apr 12 11:40:02 2009
@@ -117,6 +117,9 @@
 
 link:images/gaussian-blur-graph.png[Resulting graph].
 
+You can also just call the function gegl_dot_node_to_png() directly
+from within gdb to show the graphviz graph of a node and its
+dependencies.
 
 == Tests
 

Modified: trunk/gegl/gegl-dot.c
==============================================================================
--- trunk/gegl/gegl-dot.c	(original)
+++ trunk/gegl/gegl-dot.c	Sun Apr 12 11:40:02 2009
@@ -287,3 +287,31 @@
 
   return g_string_free (string, FALSE);
 }
+
+/**
+ * gegl_dot_node_to_png:
+ * @node: Node to depict graph for.
+ * @png_path: Path of the png to write.
+ *
+ * This is for debug purposes, meant to be invoked directly from a
+ * debugger.
+ **/
+void
+gegl_dot_node_to_png (GeglNode    *node,
+                      const gchar *png_path)
+{
+  gchar      *dot_string   = NULL;
+  gchar      *dot_filename = NULL;
+  gchar      *dot_cmd      = NULL;
+
+  /* Get dot string */
+  dot_string = gegl_to_dot (node);
+
+  /* Write it to a file */
+  dot_filename = g_build_filename (g_get_tmp_dir (), "gegl-dot.dot", NULL);
+  g_file_set_contents (dot_filename, dot_string, -1, NULL);
+
+  /* Create a png from it */
+  dot_cmd = g_strdup_printf ("dot -o %s -Tpng %s", png_path, dot_filename);
+  system (dot_cmd);
+}

Modified: trunk/gegl/gegl-dot.h
==============================================================================
--- trunk/gegl/gegl-dot.h	(original)
+++ trunk/gegl/gegl-dot.h	Sun Apr 12 11:40:02 2009
@@ -29,6 +29,8 @@
                                           GeglNode       *node);
 void   gegl_dot_util_add_connection      (GString        *string,
                                           GeglConnection *connection);
+void   gegl_dot_node_to_png              (GeglNode       *node,
+                                          const gchar    *png_path);
 
 
 #endif