/* Deinterlace 1.00 - image processing plug-in for the Gimp 1.0 API
 *
 * Copyright (C) 1997 Andrew Kieschnick (andrewk@mail.utexas.edu)
 *
 * Original deinterlace for the Gimp 0.54 API by Federico Mena Quintero
 *
 * Copyright (C) 1996 Federico Mena Quintero
 *
 * Any bugs in this code are probably my (Andrew Kieschnick's) fault, as I
 * pretty much rewrote it from scratch.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <stdlib.h>
#include <libgimp/gimp.h>
#include <gtk/gtk.h>
#include "megawidget.h"


/* Declare local functions.
 */
static void      query  (void);
static void      run    (char      *name,
			 int        nparams,
			 GParam    *param,
			 int       *nreturn_vals,
			 GParam   **return_vals);

static void      deinterlace             (GDrawable  *drawable);

static gint      deinterlace_dialog(void);

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

static gint DeinterlaceValue = 1;

MAIN ()

static void
query ()
{
  static GParamDef args[] =
  {
    { PARAM_INT32, "run_mode", "Interactive, non-interactive" },
    { PARAM_IMAGE, "image", "Input image (unused)" },
    { PARAM_DRAWABLE, "drawable", "Input drawable" },
    { PARAM_INT32, "evenodd", "0 = keep odd, 1 = keep even" },
  };
  static GParamDef *return_vals = NULL;
  static int nargs = sizeof (args) / sizeof (args[0]);
  static int nreturn_vals = 0;

  gimp_install_procedure ("plug_in_deinterlace",
			  "Deinterlace",
			  "Deinterlace is useful for processing images from video capture cards. When only the odd or even fields get captured, deinterlace can be used to interpolate between the existing fields to correct this.",
			  "Andrew Kieschnick",
			  "Andrew Kieschnick",
			  "1997",
			  "<Image>/Filters/Image/Deinterlace",
			  "RGB*, GRAY*",
			  PROC_PLUG_IN,
			  nargs, nreturn_vals,
			  args, return_vals);
}

static void
run (char    *name,
     int      nparams,
     GParam  *param,
     int     *nreturn_vals,
     GParam **return_vals)
{
  static GParam values[1];
  GDrawable *drawable;
  GRunModeType run_mode;
  GStatusType status = STATUS_SUCCESS;

  run_mode = param[0].data.d_int32;

  /*  Get the specified drawable  */
  drawable = gimp_drawable_get (param[2].data.d_drawable);

  switch (run_mode)
    {
    case RUN_INTERACTIVE:
      gimp_get_data("plug_in_deinterlace", &DeinterlaceValue);
      if (! deinterlace_dialog())
	status = STATUS_EXECUTION_ERROR;
      break;

    case RUN_NONINTERACTIVE:
      if (nparams != 1)
	status = STATUS_CALLING_ERROR;
      if (status == STATUS_SUCCESS)
	DeinterlaceValue = param[3].data.d_int32;
      break;
      
    case RUN_WITH_LAST_VALS:
      gimp_get_data("plug_in_deinterlace", &DeinterlaceValue);
      break;
      
    default:
      break;
    }

  if (status == STATUS_SUCCESS)
    {
      /*  Make sure that the drawable is gray or RGB color  */
      if (gimp_drawable_color (drawable->id) || gimp_drawable_gray (drawable->id))
	{
	  gimp_progress_init ("deinterlace");
	  gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
	  deinterlace (drawable);
	  
	  if (run_mode != RUN_NONINTERACTIVE)
	    gimp_displays_flush ();
	  if (run_mode == RUN_INTERACTIVE)
	    gimp_set_data("plug_in_deinterlace", &DeinterlaceValue, sizeof(DeinterlaceValue));
	}
      else
	{
	  /* gimp_message ("deinterlace: cannot operate on indexed color images"); */
	  status = STATUS_EXECUTION_ERROR;
	}
    }
  *nreturn_vals = 1;
  *return_vals = values;

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

  gimp_drawable_detach (drawable);
}

static void
deinterlace (GDrawable *drawable)
{
  GPixelRgn srcPR, destPR;
  gint width, height;
  gint bytes;
  guchar *dest;
  guchar *upper;
  guchar *lower;
  gint row, col;
  gint x1, y1, x2, y2;

  /* Get the input area. This is the bounding box of the selection in
   *  the image (or the entire image if there is no selection). Only
   *  operating on the input area is simply an optimization. It doesn't
   *  need to be done for correct operation. (It simply makes it go
   *  faster, since fewer pixels need to be operated on).
   */

  gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);

  /* Get the size of the input image. (This will/must be the same
   *  as the size of the output image.
   */
  width = drawable->width;
  height = drawable->height;
  bytes = drawable->bpp;

  /*  allocate row buffers  */
  dest = (guchar *) malloc ((x2 - x1) * bytes);
  upper = (guchar *) malloc ((x2 - x1) * bytes);
  lower = (guchar *) malloc ((x2 - x1) * bytes);
  
  /*  initialize the pixel regions  */
  gimp_pixel_rgn_init (&srcPR, drawable, 0, 0, width, height, FALSE, FALSE);
  gimp_pixel_rgn_init (&destPR, drawable, 0, 0, width, height, TRUE, TRUE);

  /*  loop through the rows, performing our magic*/
  for (row = y1; row < y2; row++)
    {

    gimp_pixel_rgn_get_row (&srcPR, dest, x1, row, (x2-x1));

/* Only do interpolation if the row:
   (1) Isn't one we want to keep
   (2) Has both an upper and a lower row
   Otherwise, just duplicate the source row
 */
    if (!((row % 2 == DeinterlaceValue) || (row - 1 < 0) || (row + 1 >= height))) {
      gimp_pixel_rgn_get_row (&srcPR, upper, x1, row-1, (x2-x1));
      gimp_pixel_rgn_get_row (&srcPR, lower, x1, row+1, (x2-x1));
      for (col=(x1*bytes); col < (x2*bytes); col++)
	dest[col]=(upper[col]+lower[col])>>1;
    }
    gimp_pixel_rgn_set_row (&destPR, dest, x1, row, (x2-x1));
    
    if ((row % 5) == 0)
	gimp_progress_update ((double) row / (double) (y2 - y1));
    }

  /*  update the deinterlaced region  */

  gimp_drawable_flush (drawable);
  gimp_drawable_merge_shadow (drawable->id, TRUE);
  gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));

  free (dest);
}

static gint deinterlace_dialog()
{
  GtkWidget *dlg;
  GtkWidget *vbox;
  gint runp;
  struct mwRadioGroup modes[] = {
    { "Keep Odd Fields", 0},
    { "Keep Even Fields", 0},
    { NULL, 0}};

  modes[DeinterlaceValue].var = 1;

  dlg = mw_app_new("plug_in_deinterlace", "Deinterlace", &runp);

  vbox = gtk_vbox_new(FALSE, 5);
  gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), vbox, TRUE, TRUE, 0);
  gtk_widget_show(vbox);

  mw_radio_group_new(vbox, "Mode", modes);

  gtk_widget_show(dlg);
  gtk_main();
  gdk_flush();

  DeinterlaceValue = mw_radio_result(modes);

  if (runp)
    return 1;
  else
    return 0;
}






