/* 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.
 */

/*
 * This filter tiles an image to arbitrary width and height
 */
#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <gtk/gtk.h>

#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>

#include "libgimp/stdplugins-intl.h"


typedef struct
{
  gint new_width;
  gint new_height;
  gint constrain;
  gint new_image;
} TileVals;


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

static gint32  tile        (gint32     image_id,
                            gint32     drawable_id,
                            gint32    *layer_id);

static gint    tile_dialog (gint32     image_ID,
                            gint32     drawable_ID);


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

static TileVals tvals =
{
  1,     /* new_width  */
  1,     /* new_height */
  TRUE,  /* constrain  */
  TRUE   /* new_image  */
};


MAIN ()

static void
query (void)
{
  static GimpParamDef args[] =
  {
    { GIMP_PDB_INT32,    "run_mode",  "Interactive, non-interactive" },
    { GIMP_PDB_IMAGE,    "image",      "Input image (unused)"        },
    { GIMP_PDB_DRAWABLE, "drawable",   "Input drawable"              },
    { GIMP_PDB_INT32,    "new_width",  "New (tiled) image width"     },
    { GIMP_PDB_INT32,    "new_height", "New (tiled) image height"    },
    { GIMP_PDB_INT32,    "new_image",  "Create a new image?"         }
  };

  static GimpParamDef return_vals[] =
  {
    { GIMP_PDB_IMAGE, "new_image", "Output image (N/A if new_image == FALSE)" },
    { GIMP_PDB_LAYER, "new_layer", "Output layer (N/A if new_image == FALSE)" }
  };

  gimp_install_procedure ("plug_in_tile",
			  "Create a new image which is a tiled version of the "
			  "input drawable",
			  "This function creates a new image with a single "
			  "layer sized to the specified 'new_width' and "
			  "'new_height' parameters.  The specified drawable "
			  "is tiled into this layer.  The new layer will have "
			  "the same type as the specified drawable and the "
			  "new image will have a corresponding base type.",
			  "Spencer Kimball & Peter Mattis",
			  "Spencer Kimball & Peter Mattis",
			  "1996-1997",
			  N_("<Image>/Filters/Map/_Tile..."),
			  "RGB*, GRAY*, INDEXED*",
			  GIMP_PLUGIN,
			  G_N_ELEMENTS (args),
                          G_N_ELEMENTS (return_vals),
			  args, return_vals);
}

static void
run (const gchar      *name,
     gint              nparams,
     const GimpParam  *param,
     gint             *nreturn_vals,
     GimpParam       **return_vals)
{
  static GimpParam  values[3];
  GimpRunMode       run_mode;
  GimpPDBStatusType status = GIMP_PDB_SUCCESS;
  gint32            new_layer;
  gint              width;
  gint              height;

  run_mode = param[0].data.d_int32;

  INIT_I18N ();

  *nreturn_vals = 3;
  *return_vals  = values;

  values[0].type          = GIMP_PDB_STATUS;
  values[0].data.d_status = status;
  values[1].type          = GIMP_PDB_IMAGE;
  values[2].type          = GIMP_PDB_LAYER;

  width  = gimp_drawable_width  (param[2].data.d_drawable);
  height = gimp_drawable_height (param[2].data.d_drawable);

  switch (run_mode)
    {
    case GIMP_RUN_INTERACTIVE:
      /*  Possibly retrieve data  */
      gimp_get_data ("plug_in_tile", &tvals);

      /*  First acquire information with a dialog  */
      if (! tile_dialog (param[1].data.d_image,
			 param[2].data.d_drawable))
	return;
      break;

    case GIMP_RUN_NONINTERACTIVE:
      /*  Make sure all the arguments are there!  */
      if (nparams != 6)
	{
	  status = GIMP_PDB_CALLING_ERROR;
	}
      else
	{
	  tvals.new_width  = param[3].data.d_int32;
	  tvals.new_height = param[4].data.d_int32;
	  tvals.new_image  = param[5].data.d_int32 ? TRUE : FALSE;

	  if (tvals.new_width < 0 || tvals.new_height < 0)
	    status = GIMP_PDB_CALLING_ERROR;
	}
      break;

    case GIMP_RUN_WITH_LAST_VALS:
      /*  Possibly retrieve data  */
      gimp_get_data ("plug_in_tile", &tvals);
      break;

    default:
      break;
    }

  /*  Make sure that the drawable is gray or RGB color  */
  if (status == GIMP_PDB_SUCCESS)
    {
      gimp_progress_init (_("Tiling..."));
      gimp_tile_cache_ntiles (2 * (width + 1) / gimp_tile_width ());

      values[1].data.d_image = tile (param[1].data.d_image,
				     param[2].data.d_drawable,
				     &new_layer);
      values[2].data.d_layer = new_layer;

      /*  Store data  */
      if (run_mode == GIMP_RUN_INTERACTIVE)
	gimp_set_data ("plug_in_tile", &tvals, sizeof (TileVals));

      if (run_mode != GIMP_RUN_NONINTERACTIVE)
	{
	  if (tvals.new_image)
	    gimp_display_new (values[1].data.d_image);
	  else
	    gimp_displays_flush ();
	}
    }

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

static gint32
tile (gint32  image_id,
      gint32  drawable_id,
      gint32 *layer_id)
{
  GimpPixelRgn       src_rgn;
  GimpPixelRgn       dest_rgn;
  GimpDrawable      *drawable;
  GimpDrawable      *new_layer;
  GimpImageBaseType  image_type;
  gint32   new_image_id;
  gint     old_width, old_height;
  gint     width, height;
  gint     i, j, k;
  gint     progress, max_progress;
  gpointer pr;

  /* sanity check parameters */
  if (tvals.new_width < 1 || tvals.new_height < 1)
    {
      *layer_id = -1;
      return -1;
    }

  /* initialize */
  image_type = GIMP_RGB;
  new_image_id = 0;

  old_width  = gimp_drawable_width  (drawable_id);
  old_height = gimp_drawable_height (drawable_id);

  if (tvals.new_image)
    {
      /*  create  a new image  */
      switch (gimp_drawable_type (drawable_id))
	{
	case GIMP_RGB_IMAGE : case GIMP_RGBA_IMAGE:
	  image_type = GIMP_RGB;
	  break;
	case GIMP_GRAY_IMAGE : case GIMP_GRAYA_IMAGE:
	  image_type = GIMP_GRAY;
	  break;
	case GIMP_INDEXED_IMAGE : case GIMP_INDEXEDA_IMAGE:
	  image_type = GIMP_INDEXED;
	  break;
	}

      new_image_id = gimp_image_new (tvals.new_width, tvals.new_height,
				     image_type);
      *layer_id = gimp_layer_new (new_image_id, _("Background"),
				  tvals.new_width, tvals.new_height,
				  gimp_drawable_type (drawable_id),
				  100, GIMP_NORMAL_MODE);

      if (*layer_id == -1)
	return -1;

      gimp_image_add_layer (new_image_id, *layer_id, 0);
      new_layer = gimp_drawable_get (*layer_id);

      /*  Get the specified drawable  */
      drawable = gimp_drawable_get (drawable_id);
    }
  else
    {
      gimp_undo_push_group_start (image_id);

      gimp_image_resize (image_id,
			 tvals.new_width, tvals.new_height,
			 0, 0);

      if (gimp_drawable_is_layer (drawable_id))
	gimp_layer_resize (drawable_id,
			   tvals.new_width, tvals.new_height,
			   0, 0);

      /*  Get the specified drawable  */
      drawable = gimp_drawable_get (drawable_id);
      new_layer = drawable;
    }

  /*  progress  */
  progress = 0;
  max_progress = tvals.new_width * tvals.new_height;

  /*  tile...  */
  for (i = 0; i < tvals.new_height; i += old_height)
    {
      height = old_height;
      if (height + i > tvals.new_height)
	height = tvals.new_height - i;

      for (j = 0; j < tvals.new_width; j += old_width)
	{
	  width = old_width;

	  if (width + j > tvals.new_width)
	    width = tvals.new_width - j;

	  gimp_pixel_rgn_init (&src_rgn, drawable,
			       0, 0, width, height, FALSE, FALSE);
	  gimp_pixel_rgn_init (&dest_rgn, new_layer,
			       j, i, width, height, TRUE, FALSE);

	  for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
	       pr != NULL;
	       pr = gimp_pixel_rgns_process (pr))
	    {
	      for (k = 0; k < src_rgn.h; k++)
		memcpy (dest_rgn.data + k * dest_rgn.rowstride,
			src_rgn.data + k * src_rgn.rowstride,
			src_rgn.w * src_rgn.bpp);

	      progress += src_rgn.w * src_rgn.h;
	      gimp_progress_update ((gdouble) progress /
				    (gdouble) max_progress);
	    }
	}
    }

  /*  copy the colormap, if necessary  */
  if (image_type == GIMP_INDEXED && tvals.new_image)
    {
      gint    ncols;
      guchar *cmap;

      cmap = gimp_image_get_cmap (image_id, &ncols);
      gimp_image_set_cmap (new_image_id, cmap, ncols);
      g_free (cmap);
    }

  if (tvals.new_image)
    {
      gimp_image_undo_enable (new_image_id);
      gimp_drawable_flush (new_layer);
      gimp_drawable_detach (new_layer);
    }
  else
    gimp_undo_push_group_end (image_id);

  gimp_drawable_flush (drawable);
  gimp_drawable_detach (drawable);

  return new_image_id;
}

static gint
tile_dialog (gint32 image_ID,
	     gint32 drawable_ID)
{
  GtkWidget *dlg;
  GtkWidget *frame;
  GtkWidget *sizeentry;
  GtkWidget *chainbutton;
  GtkWidget *toggle;
  gint       width;
  gint       height;
  gdouble    xres;
  gdouble    yres;
  GimpUnit   unit;
  gboolean   run;

  gimp_ui_init ("tile", FALSE);

  width  = gimp_drawable_width (drawable_ID);
  height = gimp_drawable_height (drawable_ID);
  unit   = gimp_image_get_unit (image_ID);
  gimp_image_get_resolution (image_ID, &xres, &yres);

  tvals.new_width  = width;
  tvals.new_height = height;

  dlg = gimp_dialog_new (_("Tile"), "tile",
                         NULL, 0,
			 gimp_standard_help_func, "filters/tile.html",

                         GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                         GTK_STOCK_OK,     GTK_RESPONSE_OK,

                         NULL);

  /*  parameter settings  */
  frame = gtk_frame_new (_("Tile to New Size"));
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
  gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
  gtk_widget_show (frame);

  sizeentry = gimp_coordinates_new (unit, "%a", TRUE, TRUE, 8,
				    GIMP_SIZE_ENTRY_UPDATE_SIZE,

				    tvals.constrain, TRUE,

				    _("_Width:"), width, xres,
				    1, GIMP_MAX_IMAGE_SIZE,
				    0, width,

				    _("_Height:"), height, yres,
				    1, GIMP_MAX_IMAGE_SIZE,
				    0, height);
  gtk_container_set_border_width (GTK_CONTAINER (sizeentry), 4);
  gtk_container_add (GTK_CONTAINER (frame), sizeentry);
  gtk_table_set_row_spacing (GTK_TABLE (sizeentry), 1, 4);
  gtk_widget_show (sizeentry);

  chainbutton = GTK_WIDGET (GIMP_COORDINATES_CHAINBUTTON (sizeentry));

  toggle = gtk_check_button_new_with_mnemonic (_("C_reate New Image"));
  gtk_table_attach (GTK_TABLE (sizeentry), toggle, 0, 4, 2, 3,
		    GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);
  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), tvals.new_image);
  gtk_widget_show (toggle);

  g_signal_connect (toggle, "toggled",
                    G_CALLBACK (gimp_toggle_button_update),
                    &tvals.new_image);

  gtk_widget_show (dlg);

  run = (gtk_dialog_run (GTK_DIALOG (dlg)) == GTK_RESPONSE_OK);

  if (run)
    {
      tvals.new_width =
        RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (sizeentry), 0));
      tvals.new_height =
        RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (sizeentry), 1));

      tvals.constrain =
        gimp_chain_button_get_active (GIMP_CHAIN_BUTTON (chainbutton));
    }

  gtk_widget_destroy (dlg);

  return run;
}