GEGL code to load, rotate, crop and save an image. Use: ./foo in.png out.png. WIP!

load-rotate-crop-save.c

#include <gegl.h>
#include <glib/gprintf.h>


gint
main (gint    argc,
      gchar **argv)
{
  GeglNode *gegl,
           *save,
           *crop,
           *rotate,
           *load;

  gegl_init (&argc, &argv);  /* initialize the GEGL library */

  gegl = gegl_node_new ();

  save = gegl_node_new_child(gegl,
                            "operation", "gegl:save",
                            "path", argv[2],
                            NULL);
  crop = gegl_node_new_child (gegl,
                             "operation", "gegl:crop",
                             "x", 10.0,
                             "y", 10.0,
                             "width", 400.0,
                             "height", 400.0,
                            NULL);
  rotate = gegl_node_new_child(gegl,
                              "operation", "gegl:rotate-on-center",
                              "degrees", 90.0,
                              NULL);
  load = gegl_node_new_child(gegl,
                            "operation", "gegl:load",
                            "path", argv[1],
                            NULL);

  gegl_node_link_many (load, rotate, crop, save, NULL);
  gegl_node_process (save);
  g_object_unref (gegl);
  gegl_exit ();

  return 0;
}