/*
 * This is a plug-in for the GIMP.
 *
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 * Copyright (C) 1996 Torsten Martinsen
 *
 * 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.
 *
 * $Id$
 */

#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"


#define SCALE_WIDTH  125
#define HISTSIZE     256

#define MODE_RGB       0
#define MODE_INTEN     1

#undef INTENSITY
#define INTENSITY(p)   ((guint) (p[0]*77+p[1]*150+p[2]*29) >> 8)

typedef struct
{
  gdouble mask_size;
  gint    mode;
} OilifyVals;

typedef struct
{
  gint run;
} OilifyInterface;

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

static void      oilify_rgb         (GimpDrawable *drawable);
static void      oilify_intensity   (GimpDrawable *drawable);

static gint      oilify_dialog      (void);

static void      oilify_ok_callback (GtkWidget *widget,
				     gpointer   data);

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

static OilifyVals ovals =
{
  7.0,     /* mask size */
  0        /* mode      */
};

static OilifyInterface oint =
{
  FALSE     /*  run  */
};


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, "mask_size", "Oil paint mask size" },
    { GIMP_PDB_INT32, "mode", "Algorithm {RGB (0), INTENSITY (1)}" }
  };
  static gint nargs = sizeof (args) / sizeof (args[0]);

  gimp_install_procedure ("plug_in_oilify",
			  "Modify the specified drawable to resemble an oil "
			  "painting",
			  "This function performs the well-known oil-paint "
			  "effect on the specified drawable.  The size of the "
			  "input mask is specified by 'mask_size'.",
			  "Torsten Martinsen",
			  "Torsten Martinsen",
			  "1996",
			  N_("<Image>/Filters/Artistic/Oilify..."),
			  "RGB*, GRAY*",
			  GIMP_PLUGIN,
			  nargs, 0,
			  args, NULL);
}

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

  INIT_I18N_UI();

  run_mode = param[0].data.d_int32;

  *nreturn_vals = 2;
  *return_vals = values;

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

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

      /*  First acquire information with a dialog  */
      if (! oilify_dialog ())
        return;
      break;

    case GIMP_RUN_NONINTERACTIVE:
      /*  Make sure all the arguments are there!  */
      if (nparams != 5)
	{
	  status = GIMP_PDB_CALLING_ERROR;
	}
      else
        {
          ovals.mask_size = (gdouble) param[3].data.d_int32;
          ovals.mode = (gint) param[4].data.d_int32;

	  if ((ovals.mask_size < 1.0) ||
	      ((ovals.mode != MODE_INTEN) &&
	       (ovals.mode != MODE_RGB)))
	    status = GIMP_PDB_CALLING_ERROR;
	}
      break;

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

    default:
      break;
    }

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

  /*  Make sure that the drawable is gray or RGB color  */
  if ((status == GIMP_PDB_SUCCESS) &&
      (gimp_drawable_is_rgb (drawable->drawable_id) ||
       gimp_drawable_is_gray (drawable->drawable_id)))
    {
      gimp_progress_init (_("Oil Painting..."));
      gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));

      if (gimp_drawable_is_rgb (drawable->drawable_id) && (ovals.mode == MODE_INTEN))
        oilify_intensity (drawable);
      else
        oilify_rgb (drawable);

      if (run_mode != GIMP_RUN_NONINTERACTIVE)
        gimp_displays_flush ();

      /*  Store data  */
      if (run_mode == GIMP_RUN_INTERACTIVE)
        gimp_set_data ("plug_in_oilify", &ovals, sizeof (OilifyVals));
    }
  else
    {
      /* gimp_message ("oilify: cannot operate on indexed color images"); */
      status = GIMP_PDB_EXECUTION_ERROR;
    }

  values[0].data.d_status = status;

  gimp_drawable_detach (drawable);
}

/*
 * For each RGB channel, replace the pixel at (x,y) with the
 * value that occurs most often in the n x n chunk centered
 * at (x,y).
 */
static void
oilify_rgb (GimpDrawable *drawable)
{
  GimpPixelRgn src_rgn, dest_rgn;
  gint bytes;
  gint width, height;
  guchar *src_row, *src;
  guchar *dest_row, *dest;
  gint x, y, c, b, xx, yy, n;
  gint x1, y1, x2, y2;
  gint x3, y3, x4, y4;
  gint Val[4];
  gint Cnt[4];
  gint Hist[4][HISTSIZE];
  gpointer pr1, pr2;
  gint progress, max_progress;
  gint *tmp1, *tmp2;
  guchar *guc_tmp1;

  /*  get the selection bounds  */
  gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
  progress = 0;
  max_progress = (x2 - x1) * (y2 - y1);

  width = drawable->width;
  height = drawable->height;
  bytes = drawable->bpp;

  n = (int) ovals.mask_size / 2;

  gimp_pixel_rgn_init (&dest_rgn, drawable,
		       x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);

  for (pr1 = gimp_pixel_rgns_register (1, &dest_rgn);
       pr1 != NULL;
       pr1 = gimp_pixel_rgns_process (pr1))
    {
      dest_row = dest_rgn.data;

      for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++)
	{
	  dest = dest_row;
 
	  for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
	    {
	      memset(Cnt, 0, sizeof(Cnt));
	      memset(Val, 0, sizeof(Val));
	      memset(Hist, 0, sizeof(Hist));

	      x3 = CLAMP ((x - n), x1, x2);
	      y3 = CLAMP ((y - n), y1, y2);
	      x4 = CLAMP ((x + n + 1), x1, x2);
	      y4 = CLAMP ((y + n + 1), y1, y2);
 
	      gimp_pixel_rgn_init (&src_rgn, drawable,
				   x3, y3, (x4 - x3), (y4 - y3), FALSE, FALSE);
 
	      for (pr2 = gimp_pixel_rgns_register (1, &src_rgn);
		   pr2 != NULL;
		   pr2 = gimp_pixel_rgns_process (pr2))
		{
		  src_row = src_rgn.data;
		  
		  for (yy = 0; yy < src_rgn.h; yy++)
		    {
		      src = src_row;
		      
		      for (xx = 0; xx < src_rgn.w; xx++)
			{
			  for (b = 0,
				 tmp1 = Val,
				 tmp2 = Cnt,
				 guc_tmp1 = src;
			       b < bytes;
			       b++, tmp1++, tmp2++, guc_tmp1++)
			    {
			      if ((c = ++Hist[b][*guc_tmp1]) > *tmp2)
				{
				  *tmp1 = *guc_tmp1;
				  *tmp2 = c;
				}
			    }
			  
			  src += src_rgn.bpp;
			}
		      
		      src_row += src_rgn.rowstride;
		    }
		}
	      
	      for (b = 0, tmp1 = Val; b < bytes; b++)
		*dest++ = *tmp1++;
	    }
	  
	  dest_row += dest_rgn.rowstride;
	}
      
      progress += dest_rgn.w * dest_rgn.h;
      gimp_progress_update ((double) progress / (double) max_progress);
    }
  
  /*  update the oil-painted region  */
  gimp_drawable_flush (drawable);
  gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
  gimp_drawable_update (drawable->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
}

/*
 * For each RGB channel, replace the pixel at (x,y) with the
 * value that occurs most often in the n x n chunk centered
 * at (x,y). Histogram is based on intensity.
 */
static void
oilify_intensity (GimpDrawable *drawable)
{
  GimpPixelRgn src_rgn, dest_rgn;
  gint bytes;
  gint width, height;
  guchar *src_row, *src;
  guchar *dest_row, *dest;
  gint x, y, c, b, xx, yy, n;
  gint x1, y1, x2, y2;
  gint x3, y3, x4, y4;
  gint Val[4];
  gint Cnt;
  gint Hist[HISTSIZE];
  gpointer pr1, pr2;
  gint progress, max_progress;
  gint *tmp1;
  guchar *guc_tmp1;

  /*  get the selection bounds  */
  gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2);
  progress = 0;
  max_progress = (x2 - x1) * (y2 - y1);
  
  width = drawable->width;
  height = drawable->height;
  bytes = drawable->bpp;
  
  n = (int) ovals.mask_size / 2;
  
  gimp_pixel_rgn_init (&dest_rgn, drawable,
		       x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
  
  for (pr1 = gimp_pixel_rgns_register (1, &dest_rgn);
       pr1 != NULL;
       pr1 = gimp_pixel_rgns_process (pr1))
    {
      dest_row = dest_rgn.data;
      
      for (y = dest_rgn.y; y < (dest_rgn.y + dest_rgn.h); y++)
	{
	  dest = dest_row;
	  
	  for (x = dest_rgn.x; x < (dest_rgn.x + dest_rgn.w); x++)
	    {
	      Cnt = 0;
	      memset(Val, 0, sizeof(Val));
	      memset(Hist, 0, sizeof(Hist));

	      x3 = CLAMP ((x - n), x1, x2);
	      y3 = CLAMP ((y - n), y1, y2);
	      x4 = CLAMP ((x + n + 1), x1, x2);
	      y4 = CLAMP ((y + n + 1), y1, y2);
	      
	      gimp_pixel_rgn_init (&src_rgn, drawable,
				   x3, y3, (x4 - x3), (y4 - y3), FALSE, FALSE);
	      
	      for (pr2 = gimp_pixel_rgns_register (1, &src_rgn);
		   pr2 != NULL;
		   pr2 = gimp_pixel_rgns_process (pr2))
		{
		  src_row = src_rgn.data;
		  
		  for (yy = 0; yy < src_rgn.h; yy++)
		    {
		      src = src_row;
		      
		      for (xx = 0; xx < src_rgn.w; xx++)
			{
			  if ((c = ++Hist[INTENSITY(src)]) > Cnt)
			    {
			      Cnt = c;
			      for (b = 0,
				     tmp1 = Val,
				     guc_tmp1 = src;
				   b < bytes;
				   b++, tmp1++, guc_tmp1++)
				*tmp1 = *guc_tmp1;
			    }
			  
			  src += src_rgn.bpp;
			}
		      
		      src_row += src_rgn.rowstride;
		    }
		}
	      
	      for (b = 0, tmp1 = Val; b < bytes; b++)
		*dest++ = *tmp1++;
	    }
	  
	  dest_row += dest_rgn.rowstride;
	}
      
      progress += dest_rgn.w * dest_rgn.h;
      if ((progress % 5) == 0)
	gimp_progress_update ((double) progress / (double) max_progress);
    }
  
  /*  update the oil-painted region  */
  gimp_drawable_flush (drawable);
  gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
  gimp_drawable_update (drawable->drawable_id, x1, y1, (x2 - x1), (y2 - y1));
}

static gint
oilify_dialog (void)
{
  GtkWidget *dlg;
  GtkWidget *frame;
  GtkWidget *table;
  GtkWidget *toggle;
  GtkObject *adj;

  gimp_ui_init ("oilify", FALSE);

  dlg = gimp_dialog_new (_("Oilify"), "oilify",
			 gimp_standard_help_func, "filters/oilify.html",
			 GTK_WIN_POS_MOUSE,
			 FALSE, TRUE, FALSE,

			 GTK_STOCK_OK, oilify_ok_callback,
			 NULL, NULL, NULL, TRUE, FALSE,
			 GTK_STOCK_CANCEL, gtk_widget_destroy,
			 NULL, 1, NULL, FALSE, TRUE,

			 NULL);

  gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
                      GTK_SIGNAL_FUNC (gtk_main_quit),
                      NULL);

  /*  parameter settings  */
  frame = gtk_frame_new (_("Parameter Settings"));
  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);

  table = gtk_table_new (2, 3, FALSE);
  gtk_table_set_col_spacings (GTK_TABLE (table), 4);
  gtk_table_set_row_spacings (GTK_TABLE (table), 4);
  gtk_container_set_border_width (GTK_CONTAINER (table), 4);
  gtk_container_add (GTK_CONTAINER (frame), table);

  toggle = gtk_check_button_new_with_label (_("Use Intensity Algorithm"));
  gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 0, 1, GTK_FILL, 0, 0, 0);
  gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
                      GTK_SIGNAL_FUNC (gimp_toggle_button_update),
                      &ovals.mode);
  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), ovals.mode);
  gtk_widget_show (toggle);

  adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
			      _("Mask Size:"), SCALE_WIDTH, 0,
			      ovals.mask_size, 3.0, 50.0, 1.0, 5.0, 0,
			      TRUE, 0, 0,
			      NULL, NULL);
  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
		      GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
		      &ovals.mask_size);

  gtk_widget_show (frame);
  gtk_widget_show (table);
  gtk_widget_show (dlg);

  gtk_main ();
  gdk_flush ();

  return oint.run;
}

static void
oilify_ok_callback (GtkWidget *widget,
                    gpointer   data)
{
  oint.run = TRUE;

  gtk_widget_destroy (GTK_WIDGET (data));
}
