/*
 *  Guillotine plug-in v0.9 by Adam D. Moss, adam@foxbox.org.  1998/09/01
 */

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
 * HISTORY:
 *     0.9 : 1998/09/01
 *           Initial release.
 */

#include "config.h"

#include <stdlib.h>

#include <libgimp/gimp.h>

#include "libgimp/stdplugins-intl.h"


/* Declare local functions.
 */
static void   query      (void);
static void   run        (gchar      *name,
			  gint        nparams,
			  GimpParam  *param,
			  gint       *nreturn_vals,
			  GimpParam **return_vals);

static void   guillotine (gint32      image_ID);


GimpPlugInInfo PLUG_IN_INFO =
{
  NULL,  /* init_proc  */
  NULL,  /* quit_proc  */
  query, /* query_proc */
  run,   /* run_proc   */
};


MAIN ()

static void
query (void)
{
  static GimpParamDef args[] =
  {
    { GIMP_PDB_INT32,    "run_mode", "Interactive, non-interactive" },
    { GIMP_PDB_IMAGE,    "image",    "Input image"                  },
    { GIMP_PDB_DRAWABLE, "drawable", "Input drawable (unused)"      }
  };

  gimp_install_procedure ("plug_in_guillotine",
			  "Slice up the image into subimages, cutting along "
			  "the image's Guides.  Fooey to you and your "
			  "broccoli, Pokey.",
			  "This function takes an image and blah blah.  Hooray!",
			  "Adam D. Moss (adam@foxbox.org)",
			  "Adam D. Moss (adam@foxbox.org)",
			  "1998",
			  N_("<Image>/Image/Transform/Guillotine"),
			  "RGB*, INDEXED*, GRAY*",
			  GIMP_PLUGIN,
			  G_N_ELEMENTS (args), 0,
			  args, NULL);
}

static void
run (gchar      *name,
     gint        nparams,
     GimpParam  *param,
     gint       *nreturn_vals,
     GimpParam **return_vals)
{
  static GimpParam  values[1];
  gint32            image_ID;
  GimpPDBStatusType status = GIMP_PDB_SUCCESS;

  *nreturn_vals = 1;
  *return_vals = values;

  values[0].type = GIMP_PDB_STATUS;
  values[0].data.d_status = status;

  INIT_I18N();

  /*  Get the specified drawable  */
  image_ID = param[1].data.d_image;

  if (status == GIMP_PDB_SUCCESS)
    {
      gimp_progress_init (_("Guillotine..."));
      guillotine (image_ID);
      gimp_displays_flush ();
    }

  values[0].data.d_status = status;
}


static gint
guide_sort_func (gconstpointer a,
		 gconstpointer b)
{
  return GPOINTER_TO_INT (a) - GPOINTER_TO_INT (b);
}

static void
guillotine (gint32 image_ID)
{
  gint  guide_num;
  gboolean guides_found;
  GList *hguides, *hg;
  GList *vguides, *vg;

  hguides = g_list_append (NULL, GINT_TO_POINTER (0));
  vguides = g_list_append (NULL, GINT_TO_POINTER (0));

  hguides = g_list_append (hguides, 
			   GINT_TO_POINTER (gimp_image_height (image_ID)));
  vguides = g_list_append (vguides, 
			   GINT_TO_POINTER (gimp_image_width (image_ID)));

  guide_num = gimp_image_find_next_guide (image_ID, 0);
  guides_found = (guide_num != 0);

  while (guide_num > 0)
    {
      gint position = gimp_image_get_guide_position (image_ID, guide_num);

      switch (gimp_image_get_guide_orientation (image_ID, guide_num))
        {
        case GIMP_ORIENTATION_HORIZONTAL:
	  hguides = g_list_insert_sorted (hguides, GINT_TO_POINTER (position),
					  guide_sort_func);
          break;

        case GIMP_ORIENTATION_VERTICAL:
	  vguides = g_list_insert_sorted (vguides, GINT_TO_POINTER (position),
					  guide_sort_func);
          break;

        case GIMP_ORIENTATION_UNKNOWN:
          g_assert_not_reached ();
          break;
	}

      guide_num = gimp_image_find_next_guide (image_ID, guide_num);
    }

  if (guides_found)
    {
      gchar *filename;
      gint   x, y;

      filename = gimp_image_get_filename (image_ID);
      if (!filename)
        filename = g_strdup (_("Untitled"));

      /* Do the actual dup'ing and cropping... this isn't a too naive a
	 way to do this since we got copy-on-write tiles, either. */

      for (y = 0, hg = hguides; hg && hg->next; y++, hg = hg->next)
	{
	  for (x = 0, vg = vguides; vg && vg->next; x++, vg = vg->next)
	    {
	      gint32 new_image = gimp_image_duplicate (image_ID);
	      gchar *new_filename;

	      if (new_image == -1)
		{
		  g_warning ("Couldn't create new image.");
		  return;
		}

	      gimp_image_undo_disable (new_image);

	      gimp_image_crop (new_image, 
			       GPOINTER_TO_INT (vg->next->data) - 
			       GPOINTER_TO_INT (vg->data),
			       GPOINTER_TO_INT (hg->next->data) - 
			       GPOINTER_TO_INT (hg->data),
			       GPOINTER_TO_INT (vg->data),
			       GPOINTER_TO_INT (hg->data));

	      /* show the rough coordinates of the image in the title */
	      new_filename = g_strdup_printf ("%s-(%i,%i)",
					      filename,
					      x, y);
	      gimp_image_set_filename (new_image, new_filename);
	      g_free (new_filename);

	      gimp_image_undo_enable (new_image);

	      gimp_display_new (new_image);
	    }
	}

      g_free (filename);
    }

  g_list_free (hguides);
  g_list_free (vguides);
}