[gegl] examples: added gegl convert a GEGL backed format converter

[Øyvind Kolås <ok src gnome org>]

commit 734ca1f1e5abe9b63ec471b0d53ac1d285bedbd9
Author: �yvind Kolås <pippin gimp org>
Date:   Sat Jul 24 01:52:39 2010 +0100

    examples: added gegl convert a GEGL backed format converter

 examples/gegl-convert.c |   39 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)
---
diff --git a/examples/gegl-convert.c b/examples/gegl-convert.c
new file mode 100644
index 0000000..8161f8e
--- /dev/null
+++ b/examples/gegl-convert.c
@@ -0,0 +1,39 @@
+#include <gegl.h> 
+
+gint
+main (gint    argc,
+      gchar **argv)
+{
+  GeglNode *graph, *sink;
+  GeglBuffer *buffer = NULL;
+
+  gegl_init (&argc, &argv);
+
+  if (argc != 3)
+    {
+      g_print ("GEGL based image conversion tool\n");
+      g_print ("Usage: %s <imageA> <imageB>\n", argv[0]);
+      return 1;
+    }
+
+  graph = gegl_graph (sink=gegl_node ("gegl:buffer-sink", "buffer", &buffer, NULL,
+                           gegl_node ("gegl:load", "path", argv[1], NULL)));
+  gegl_node_process (sink);
+  g_object_unref (graph);
+  if (!buffer)
+    {
+      g_print ("Failed to open %s\n", argv[1]);
+      return 1;
+    }
+
+  graph = gegl_graph (sink=gegl_node ("gegl:save",
+                      "path", argv[2], NULL,
+                      gegl_node ("gegl:buffer-source", "buffer", buffer, NULL)));
+  gegl_node_process (sink);
+
+  g_object_unref (buffer); 
+  g_object_unref (buffer);  /* XXX: why is two unrefs needed here? */
+  g_object_unref (graph);
+  gegl_exit ();
+  return 0;
+}