/* $Id$
 *
 * unsharp.c 0.10 -- This is a plug-in for the GIMP 1.0
 *  http://www.steppe.com/~winston/gimp/unsharp.html
 *
 * Copyright (C) 1999 Winston Chang
 *                    <wchang3@students.wisc.edu>
 *                    <winston@steppe.com>
 *
 * 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.
 */

#include "config.h"

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

#include <gtk/gtk.h>

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

#include "libgimp/stdplugins-intl.h"

#define PLUG_IN_VERSION "0.10"

#define SCALE_WIDTH  150

/* to show both pretty unoptimized code and ugly optimized code blocks
   There's really no reason to define this, unless you want to see how
   much pointer aritmetic can speed things up.  I find that it is about
   45% faster with the optimized code. */
/* #define READABLE_CODE */

/* uncomment this line to get a rough feel of how long the
   plug-in takes to run */
/* #define TIMER */
#ifdef TIMER
#include <sys/time.h>
#include <unistd.h>

static void timerstart (void);
static void timerstop  (void);
static struct timeval time_start, time_stop;
#endif

typedef struct
{
  gdouble radius;
  gdouble amount;
  gint    threshold;
} UnsharpMaskParams;

typedef struct
{
  gint run;
} UnsharpMaskInterface;

/* local function prototypes */
static void query (void);
static void run   (gchar   *name,
		   gint     nparams,
		   GParam  *param,
		   gint    *nreturn_vals,
		   GParam **return_vals);

static inline void blur_line     (gdouble    *ctable,
				  gdouble    *cmatrix,
				  gint        cmatrix_length,
				  guchar     *cur_col,
				  guchar     *dest_col,
				  gint        y,
				  glong       bytes);
static int gen_convolve_matrix   (gdouble     std_dev,
				  gdouble   **cmatrix);
static gdouble* gen_lookup_table (gdouble*    cmatrix,
				  gint        cmatrix_length);
static void unsharp_region       (GPixelRgn   srcPTR,
				  GPixelRgn   dstPTR,
				  gint        width,
				  gint        height,
				  gint        bytes,
				  gdouble     radius,
				  gdouble     amount,
				  gint        x1,
				  gint        x2,
				  gint        y1,
				  gint        y2);

static void unsharp_mask         (GDrawable *drawable,
				  gint       radius,
				  gdouble    amount);

static void unsharp_ok_callback  (GtkWidget *widget,
				  gpointer   data);
static gint unsharp_mask_dialog  (void);

/* preview shit -- not finished yet */
#undef PREVIEW
#ifdef PREVIEW
static void preview_scroll_callback (void);
static void preview_init            (void);
static void preview_exit            (void);
static void preview_update          (void);

static GtkWidget* preview;
static gint       preview_width;    /* Width of preview widget */
static gint       preview_height;   /* Height of preview widget */
static gint       preview_x1;       /* Upper-left X of preview */
static gint       preview_y1;       /* Upper-left Y of preview */
static gint       preview_x2;       /* Lower-right X of preview */
static gint       preview_y2;       /* Lower-right Y of preview */

static gint       sel_width;    /* Selection width */
static gint       sel_height;   /* Selection height */
		
static GtkObject *hscroll_data;    /* Horizontal scrollbar data */
static GtkObject *vscroll_data;    /* Vertical scrollbar data */
#endif

static gint       run_filter = FALSE;
		

/* create a few globals, set default values */
static UnsharpMaskParams unsharp_params =
{
  5.0, /* default radius = 5 */
  0.5, /* default amount = .5 */
  0    /* default threshold = 0 */
};

/* static UnsharpMaskInterface umint = { FALSE }; */

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

MAIN ()

static void
query (void)
{
  static GParamDef args[] =
  {
    { PARAM_INT32, "run_mode", "Interactive, non-interactive" },
    { PARAM_IMAGE, "image", "(unused)" },
    { PARAM_DRAWABLE, "drawable", "Drawable to draw on" },
    { PARAM_FLOAT, "radius", "Radius of gaussian blur (in pixels > 1.0)" },
    { PARAM_FLOAT, "amount", "Strength of effect" },
    { PARAM_FLOAT, "threshold", "Threshold" }
  };
  static gint nargs = sizeof (args) / sizeof (args[0]);
	
  INIT_I18N();

  /* Install a procedure in the procedure database. */
  gimp_install_procedure ("plug_in_unsharp_mask",
			  "An unsharp mask filter",
			  "",
			  "Winston Chang <wchang3@students.wisc.edu>",
			  "Winston Chang",
			  "1999",
			  N_("<Image>/Filters/Enhance/Unsharp Mask..."),
			  "GRAY*, RGB*",
			  PROC_PLUG_IN,
			  nargs, 0,
			  args, NULL);
}

/* this is the actual function */
static void
run (gchar   *name,
     gint     nparams,
     GParam  *param,
     gint    *nreturn_vals,
     GParam **return_vals)
{
  static GParam values[1];
  GDrawable *drawable;
  GRunModeType run_mode;
  GStatusType status = STATUS_SUCCESS;

#ifdef TIMER
  timerstart();
#endif

  run_mode = param[0].data.d_int32;

  values[0].type = PARAM_STATUS;
  values[0].data.d_status = status;
  *return_vals = values;
  *nreturn_vals = 1;

  INIT_I18N_UI(); 

  switch (run_mode)
    {
    case RUN_INTERACTIVE:
      gimp_get_data ("plug_in_unsharp_mask", &unsharp_params);
      if (! unsharp_mask_dialog ()) return;
      break;

    case RUN_NONINTERACTIVE:
      if (nparams != 6)
	{
	  status = STATUS_CALLING_ERROR;
	}
      else
	{
	  unsharp_params.radius = param[3].data.d_float;
	  unsharp_params.amount = param[4].data.d_float; 
	  unsharp_params.threshold = param[5].data.d_int32;

	  /* make sure there are legal values */
	  if ((unsharp_params.radius < 0.0) ||
	      (unsharp_params.amount<0.0))
	    status = STATUS_CALLING_ERROR;
	}
      break;

    case RUN_WITH_LAST_VALS:
      gimp_get_data ("plug_in_unsharp_mask", &unsharp_params);
      break;

    default:
      break;
    }

  if (status == STATUS_SUCCESS)
    {
      drawable = gimp_drawable_get (param[2].data.d_drawable);
      gimp_tile_cache_ntiles(2 * (drawable->width / gimp_tile_width() + 1));

      /* here we go */
      unsharp_mask (drawable, unsharp_params.radius, unsharp_params.amount);

      /* values[0].data.d_status = status; */
      gimp_displays_flush ();

      /* set data for next use of filter */
      gimp_set_data ("plug_in_unsharp_mask", &unsharp_params,
		     sizeof (UnsharpMaskParams));

      /*fprintf(stderr, "%f %f\n", unsharp_params.radius, unsharp_params.amount);*/

      gimp_drawable_detach(drawable);
      values[0].data.d_status = status;
    }
#ifdef TIMER
  timerstop ();
#endif
}

/* -------------------------- Unsharp Mask ------------------------- */
static void
unsharp_mask (GDrawable *drawable,
	      gint       radius,
	      gdouble amount)
{
  GPixelRgn srcPR, destPR;
  glong width, height;
  glong bytes;
  gint x1, y1, x2, y2;
  gdouble* cmatrix = NULL;
  gint cmatrix_length;
  gdouble* ctable;

  /* Get the input */
  gimp_drawable_mask_bounds(drawable->id, &x1, &y1, &x2, &y2);
  gimp_progress_init(_("Blurring..."));

  /* generate convolution matrix */
  cmatrix_length = gen_convolve_matrix(radius, &cmatrix);
  /* generate lookup table */
  ctable = gen_lookup_table(cmatrix, cmatrix_length);

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

  /* initialize 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);

  unsharp_region (srcPR, destPR, width, height, bytes, radius, amount,
		  x1, x2, y1, y2);

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

/* perform an unsharp mask on the region, given a source region, dest.
   region, width and height of the regions, and corner coordinates of
   a subregion to act upon.  Everything outside the subregion is unaffected.
  */
static void
unsharp_region (GPixelRgn srcPR,
		GPixelRgn destPR,
		gint      width,
		gint      height,
		gint      bytes,
		gdouble   radius,
		gdouble   amount,
		gint      x1,
		gint      x2,
		gint      y1,
		gint      y2)
{
  guchar* cur_col;
  guchar* dest_col;
  guchar* cur_row;
  guchar* dest_row;
  gint x;
  gint y;
  gdouble* cmatrix = NULL;
  gint cmatrix_length;
  gdouble* ctable;

  gint row, col;  /* these are counters for loops */

  /* these are used for the merging step */
  gint threshold;
  gint diff;
  gint value;
  gint u,v;

  /* find height and width of subregion to act on */
  x = x2-x1;
  y = y2-y1;

  /* generate convolution matrix and make sure it's smaller than each dimension */
  cmatrix_length = gen_convolve_matrix(radius, &cmatrix);
  /* generate lookup table */
  ctable = gen_lookup_table(cmatrix, cmatrix_length);

  /*  allocate row buffers  */
  cur_row = (guchar *) g_malloc (x * bytes);
  dest_row = (guchar *) g_malloc (x * bytes);

  /* find height and width of subregion to act on */
  x = x2-x1;
  y = y2-y1;

  /* blank out a region of the destination memory area, I think */
  for (row = 0; row < y; row++)
    {
      gimp_pixel_rgn_get_row(&destPR, dest_row, x1, y1+row, (x2-x1));
      memset(dest_row, 0, x*bytes);
      gimp_pixel_rgn_set_row(&destPR, dest_row, x1, y1+row, (x2-x1));
    }

  /* blur the rows */
  for (row = 0; row < y; row++)
    {
      gimp_pixel_rgn_get_row(&srcPR, cur_row, x1, y1+row, x);
      gimp_pixel_rgn_get_row(&destPR, dest_row, x1, y1+row, x);
      blur_line(ctable, cmatrix, cmatrix_length, cur_row, dest_row, x, bytes);
      gimp_pixel_rgn_set_row(&destPR, dest_row, x1, y1+row, x);

      if (row%5 == 0)
	gimp_progress_update((gdouble)row/(3*y));
    }

  /* allocate column buffers */
  cur_col = (guchar *) g_malloc (y * bytes);
  dest_col = (guchar *) g_malloc (y * bytes);

  /* blur the cols */
  for (col = 0; col < x; col++)
    {
      gimp_pixel_rgn_get_col(&destPR, cur_col, x1+col, y1, y);
      gimp_pixel_rgn_get_col(&destPR, dest_col, x1+col, y1, y);
      blur_line(ctable, cmatrix, cmatrix_length, cur_col, dest_col, y, bytes);
      gimp_pixel_rgn_set_col(&destPR, dest_col, x1+col, y1, y);

      if (col%5 == 0)
	gimp_progress_update((gdouble)col/(3*x) + 0.33);
    }

  gimp_progress_init(_("Merging..."));

  /* find integer value of threshold */
  threshold = unsharp_params.threshold;
	
  /* merge the source and destination (which currently contains
     the blurred version) images */
  for (row = 0; row < y; row++)
    {
      value = 0;
      /* get source row */
      gimp_pixel_rgn_get_row(&srcPR, cur_row, x1, y1+row, x);
      /* get dest row */
      gimp_pixel_rgn_get_row(&destPR, dest_row, x1, y1+row, x);
      /* combine the two */
      for (u = 0; u < x; u++)
	{
	  for (v = 0; v < bytes; v++)
	    {
	      diff = (cur_row[u*bytes+v] - dest_row[u*bytes+v]);
	      /* do tresholding */
	      if (abs (2 * diff) < threshold)
		diff = 0;

	      value = cur_row[u*bytes+v] + amount * diff;
				
	      if (value < 0) dest_row[u*bytes+v] =0;
	      else if (value > 255) dest_row[u*bytes+v] = 255;
	      else  dest_row[u*bytes+v] = value;
	    }
	}
      /* update progress bar every five rows */
      if (row%5 == 0) gimp_progress_update((gdouble)row/(3*y) + 0.67);
      gimp_pixel_rgn_set_row(&destPR, dest_row, x1, y1+row, x);
    }

  /* free the memory we took */
  g_free(cur_row);
  g_free(dest_row);
  g_free(cur_col);
  g_free(dest_col);
}

/* this function is written as if it is blurring a column at a time,
   even though it can operate on rows, too.  There is no difference
   in the processing of the lines, at least to the blur_line function. */
static inline void
blur_line (gdouble *ctable,
	   gdouble *cmatrix,
	   gint     cmatrix_length,
	   guchar  *cur_col,
	   guchar  *dest_col,
	   gint     y,
	   glong    bytes)
{
#ifdef READABLE_CODE
/* ------------- semi-readable code ------------------- */
  gdouble scale;
  gdouble sum;
  gint i,j;
  gint row;

  /* this is to take care cases in which the matrix can go over
   * both edges at once.  It's not efficient, but this can only
   * happen in small pictures anyway.
   */
  if (cmatrix_length > y)
    {
      for (row = 0; row < y ; row++)
	{
	  scale = 0;
	  /* find the scale factor */
	  for (j = 0; j < y ; j++)
	    {
	      /* if the index is in bounds, add it to the scale counter */
	      if ((j + cmatrix_length/2 - row >= 0) &&
		  (j + cmatrix_length/2 - row < cmatrix_length))
		scale += cmatrix[j + cmatrix_length/2 - row];
	    }
	  for (i = 0; i<bytes; i++)
	    {
	      sum = 0;
	      for (j = 0; j < y; j++)
		{
		  if ((j >= row - cmatrix_length/2) &&
		      (j <= row + cmatrix_length/2))
		    sum += cur_col[j*bytes + i] * cmatrix[j];
		}
	      dest_col[row*bytes + i] = (guchar) ROUND (sum / scale);
	    }
	}
    }
  else
    {  /* when the cmatrix is smaller than row length */
      /* for the edge condition, we only use available info, and scale to one */
      for (row = 0; row < cmatrix_length/2; row++)
	{
	  /* find scale factor */
	  scale=0;
	  for (j = cmatrix_length/2 - row; j<cmatrix_length; j++)
	    scale += cmatrix[j];

	  for (i = 0; i<bytes; i++)
	    {
	      sum = 0;
	      for (j = cmatrix_length/2 - row; j<cmatrix_length; j++)
		{
		  sum += cur_col[(row + j-cmatrix_length/2)*bytes + i] *
		    cmatrix[j];
		}
	      dest_col[row*bytes + i] = (guchar) ROUND (sum / scale);
	    }
	}
      /* go through each pixel in each col */
      for (; row < y-cmatrix_length/2; row++)
	{
	  for (i = 0; i<bytes; i++)
	    {
	      sum = 0;
	      for (j = 0; j<cmatrix_length; j++)
		{
		  sum += cur_col[(row + j-cmatrix_length/2)*bytes + i] * cmatrix[j];
		}
	      dest_col[row*bytes + i] = (guchar) ROUND (sum);
	    }
	}
      /* for the edge condition , we only use available info, and scale to one */
      for (; row < y; row++)
	{
	  /* find scale factor */
	  scale=0;
	  for (j = 0; j< y-row + cmatrix_length/2; j++)
	    scale += cmatrix[j];

	  for (i = 0; i<bytes; i++)
	    {
	      sum = 0;
	      for (j = 0; j<y-row + cmatrix_length/2; j++)
		{
		  sum += cur_col[(row + j-cmatrix_length/2)*bytes + i] * cmatrix[j];
		}
	      dest_col[row*bytes + i] = (guchar) ROUND (sum / scale);
	    }
	}
    }
#endif
#ifndef READABLE_CODE
  /* --------------- optimized, unreadable code -------------------*/
  gdouble scale;
  gdouble sum;
  gint i=0, j=0;
  gint row;
  gint cmatrix_middle = cmatrix_length/2;

  gdouble *cmatrix_p;
  guchar  *cur_col_p;
  guchar  *cur_col_p1;
  guchar  *dest_col_p;
  gdouble *ctable_p;

  /* this first block is the same as the non-optimized version --
   * it is only used for very small pictures, so speed isn't a
   * big concern.
   */
  if (cmatrix_length > y)
    {
      for (row = 0; row < y ; row++)
	{
	  scale=0;
	  /* find the scale factor */
	  for (j = 0; j < y ; j++)
	    {
	      /* if the index is in bounds, add it to the scale counter */
	      if ((j + cmatrix_length/2 - row >= 0) &&
		  (j + cmatrix_length/2 - row < cmatrix_length))
		scale += cmatrix[j + cmatrix_length/2 - row];
	    }
	  for (i = 0; i<bytes; i++)
	    {
	      sum = 0;
	      for (j = 0; j < y; j++)
		{
		  if ((j >= row - cmatrix_length/2) &&
		      (j <= row + cmatrix_length/2))
		    sum += cur_col[j*bytes + i] * cmatrix[j];
		}
	      dest_col[row*bytes + i] = (guchar) ROUND (sum / scale);
	    }
	}
    }
  else
    {
      /* for the edge condition, we only use available info and scale to one */
      for (row = 0; row < cmatrix_middle; row++)
	{
	  /* find scale factor */
	  scale=0;
	  for (j = cmatrix_middle - row; j<cmatrix_length; j++)
	    scale += cmatrix[j];
	  for (i = 0; i<bytes; i++)
	    {
	      sum = 0;
	      for (j = cmatrix_middle - row; j<cmatrix_length; j++)
		{
		  sum += cur_col[(row + j-cmatrix_middle)*bytes + i] * cmatrix[j];
		}
	      dest_col[row*bytes + i] = (guchar) ROUND (sum / scale);
	    }
	}
      /* go through each pixel in each col */
      dest_col_p = dest_col + row*bytes;
      for (; row < y-cmatrix_middle; row++)
	{
	  cur_col_p = (row - cmatrix_middle) * bytes + cur_col;
	  for (i = 0; i<bytes; i++)
	    {
	      sum = 0;
	      cmatrix_p = cmatrix;
	      cur_col_p1 = cur_col_p;
	      ctable_p = ctable;
	      for (j = cmatrix_length; j>0; j--)
		{
		  sum += *(ctable_p + *cur_col_p1);
		  cur_col_p1 += bytes;
		  ctable_p += 256;
		}
	      cur_col_p++;
	      *(dest_col_p++) = ROUND (sum);
	    }
	}
	
      /* for the edge condition , we only use available info, and scale to one */
      for (; row < y; row++)
	{
	  /* find scale factor */
	  scale=0;
	  for (j = 0; j< y-row + cmatrix_middle; j++)
	    scale += cmatrix[j];
	  for (i = 0; i<bytes; i++)
	    {
	      sum = 0;
	      for (j = 0; j<y-row + cmatrix_middle; j++)
		{
		  sum += cur_col[(row + j-cmatrix_middle)*bytes + i] * cmatrix[j];
		}
	      dest_col[row*bytes + i] = (guchar) ROUND (sum / scale);
	    }
	}
    }
#endif
}

/* generates a 1-D convolution matrix to be used for each pass of 
 * a two-pass gaussian blur.  Returns the length of the matrix.
 */
static gint
gen_convolve_matrix (gdouble   radius,
		     gdouble **cmatrix_p)
{
  gint matrix_length;
  gint matrix_midpoint;
  gdouble* cmatrix;
  gint i,j;
  gdouble std_dev;
  gdouble sum;
	
  /* we want to generate a matrix that goes out a certain radius
   * from the center, so we have to go out ceil(rad-0.5) pixels,
   * inlcuding the center pixel.  Of course, that's only in one direction,
   * so we have to go the same amount in the other direction, but not count
   * the center pixel again.  So we double the previous result and subtract
   * one.
   * The radius parameter that is passed to this function is used as
   * the standard deviation, and the radius of effect is the
   * standard deviation * 2.  It's a little confusing.
   */
  radius = fabs(radius) + 1.0;
	
  std_dev = radius;
  radius = std_dev * 2;

  /* go out 'radius' in each direction */
  matrix_length = 2 * ceil(radius-0.5) + 1;
  if (matrix_length <= 0) matrix_length = 1;
  matrix_midpoint = matrix_length/2 + 1;
  *cmatrix_p = (gdouble*)(malloc(matrix_length * sizeof(gdouble)));
  cmatrix = *cmatrix_p;

  /*  Now we fill the matrix by doing a numeric integration approximation
   * from -2*std_dev to 2*std_dev, sampling 50 points per pixel.
   * We do the bottom half, mirror it to the top half, then compute the
   * center point.  Otherwise asymmetric quantization errors will occur.
   *  The formula to integrate is e^-(x^2/2s^2).
   */

  /* first we do the top (right) half of matrix */
  for (i = matrix_length/2 + 1; i < matrix_length; i++)
    {
      double base_x = i - floor(matrix_length/2) - 0.5;
      sum = 0;
      for (j = 1; j <= 50; j++)
	{
	  if ( base_x+0.02*j <= radius ) 
	    sum += exp (-(base_x+0.02*j)*(base_x+0.02*j) / 
			(2*std_dev*std_dev));
	}
      cmatrix[i] = sum/50;
    }

  /* mirror the thing to the bottom half */
  for (i=0; i<=matrix_length/2; i++) {
    cmatrix[i] = cmatrix[matrix_length-1-i];
  }
	
  /* find center val -- calculate an odd number of quanta to make it symmetric,
   * even if the center point is weighted slightly higher than others. */
  sum = 0;
  for (j=0; j<=50; j++)
    {
      sum += exp (-(0.5+0.02*j)*(0.5+0.02*j) /
		  (2*std_dev*std_dev));
    }
  cmatrix[matrix_length/2] = sum/51;
	
  /* normalize the distribution by scaling the total sum to one */
  sum=0;
  for (i=0; i<matrix_length; i++) sum += cmatrix[i];
  for (i=0; i<matrix_length; i++) cmatrix[i] = cmatrix[i] / sum;

  return matrix_length;
}

/* ----------------------- gen_lookup_table ----------------------- */
/* generates a lookup table for every possible product of 0-255 and
   each value in the convolution matrix.  The returned array is
   indexed first by matrix position, then by input multiplicand (?)
   value.
*/
static gdouble *
gen_lookup_table (gdouble *cmatrix,
		  gint     cmatrix_length)
{
  int i, j;
  gdouble* lookup_table = malloc(cmatrix_length * 256 * sizeof(gdouble));

#ifdef READABLE_CODE
  for (i=0; i<cmatrix_length; i++)
    {
      for (j=0; j<256; j++)
	{
	  lookup_table[i*256 + j] = cmatrix[i] * (gdouble)j;
	}
    }
#endif

#ifndef READABLE_CODE
  gdouble* lookup_table_p = lookup_table;
  gdouble* cmatrix_p      = cmatrix;

  for (i=0; i<cmatrix_length; i++)
    {
      for (j=0; j<256; j++)
	{
	  *(lookup_table_p++) = *cmatrix_p * (gdouble)j;
	}
      cmatrix_p++;
    }
#endif

  return lookup_table;
}

/* ------------------------ unsharp_mask_dialog ----------------------- */
static gint
unsharp_mask_dialog (void) 
{
  GtkWidget *window;
  GtkWidget *frame;
  GtkWidget *table;
  GtkObject *adj;

  gint    argc = 1;
  gchar** argv = g_new (gchar*, 1);
  argv[0]      = g_strdup ("unsharp");

  gtk_init (&argc, &argv);
  gtk_rc_parse (gimp_gtkrc ());

  gdk_set_use_xshm (gimp_use_xshm ());
  gtk_preview_set_gamma (gimp_gamma ());
  gtk_preview_set_install_cmap (gimp_install_cmap ());

  window = gimp_dialog_new (_("Unsharp Mask"), "unsharp",
			    gimp_plugin_help_func, "filters/unsharp.html",
			    GTK_WIN_POS_MOUSE,
			    FALSE, TRUE, FALSE,

			    _("OK"), unsharp_ok_callback,
			    NULL, NULL, NULL, TRUE, FALSE,
			    _("Cancel"), gtk_widget_destroy,
			    NULL, 1, NULL, FALSE, TRUE,

			    NULL);

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

  frame = gtk_frame_new (_("Parameter Settings"));
  gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (window)->vbox), frame,
		      FALSE, FALSE, 0);
  gtk_widget_show (frame);

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

  adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
			      _("Radius:"), SCALE_WIDTH, 0,
			      unsharp_params.radius, 1.0, 25.0, 0.1, 1.0, 1,
			      TRUE, 0, 0,
			      NULL, NULL);
  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
		      GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
		      &unsharp_params.radius);

  adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
			      _("Amount:"), SCALE_WIDTH, 0,
			      unsharp_params.amount, 0.0, 5.0, 0.01, 0.1, 2,
			      TRUE, 0, 0,
			      NULL, NULL);
  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
		      GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
		      &unsharp_params.amount);

  adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
			      _("Threshold:"), SCALE_WIDTH, 0,
			      unsharp_params.threshold, 0.0, 255.0, 1.0, 10.0, 0,
			      TRUE, 0, 0,
			      NULL, NULL);
  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
		      GTK_SIGNAL_FUNC (gimp_int_adjustment_update),
		      &unsharp_params.threshold);

  gtk_widget_show (window);

  gtk_main ();
  gdk_flush ();

  return run_filter;
}


/* This doesn't work yet. */
#ifdef PREVIEW
/* 'preview_init()' - Initialize the preview window... */

static void
preview_init (void)
{
  int	width;		/* Byte width of the image */

  /*
   * Setup for preview filter...
   */

  width = preview_width * img_bpp;

  preview_src   = g_malloc(width * preview_height * sizeof(guchar));
  preview_neg   = g_malloc(width * preview_height * sizeof(guchar));
  preview_dst   = g_malloc(width * preview_height * sizeof(guchar));
  preview_image = g_malloc(preview_width * preview_height * 3 * sizeof(guchar));

  preview_x1 = sel_x1;
  preview_y1 = sel_y1;
  preview_x2 = preview_x1 + preview_width;
  preview_y2 = preview_y1 + preview_height;
}

/*
 * 'preview_scroll_callback()' - Update the preview when a scrollbar is moved.
 */

static void
preview_scroll_callback (void)
{
  preview_x1 = sel_x1 + GTK_ADJUSTMENT(hscroll_data)->value;
  preview_y1 = sel_y1 + GTK_ADJUSTMENT(vscroll_data)->value;
  preview_x2 = preview_x1 + MIN(preview_width, sel_width);
  preview_y2 = preview_y1 + MIN(preview_height, sel_height);

  preview_update();
}

/*
 * 'preview_update()' - Update the preview window.
 */

static void
preview_update (void)
{

}
#endif

static void
unsharp_ok_callback (GtkWidget *widget,
		     gpointer   data)
{
  run_filter = TRUE;

  gtk_widget_destroy (GTK_WIDGET (data));
}

#ifdef TIMER
static void
timerstart (void)
{
  gettimeofday (&time_start, NULL);
}

static void
timerstop (void)
{
  long sec, usec;
	
  gettimeofday(&time_stop,NULL);
  sec = time_stop.tv_sec  - time_start.tv_sec;
  usec = time_stop.tv_usec - time_start.tv_usec;
	
  if (usec < 0)
    {
      sec--;
      usec += 1000000;
    }
	
  fprintf (stderr, "%ld.%ld seconds\n", sec, usec);
}
#endif