exchange.c 19.4 KB
Newer Older
Elliot Lee's avatar
Elliot Lee committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
/*
 * This is a plug-in for the GIMP.
 *
 * 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
16
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Elliot Lee's avatar
Elliot Lee committed
17
18
19
20
21
22
23
24
25
26
27
28
 *
 *
 */

/*
 * Exchange one color with the other (settable threshold to convert from
 * one color-shade to another...might do wonders on certain images, or be
 * totally useless on others).
 * 
 * Author: robert@experimental.net
 * 
 * TODO:
29
 *		- locken van scales met elkaar
Elliot Lee's avatar
Elliot Lee committed
30
31
 */

32
33
34
35
36
37
/* 
 * 1999/03/17   Fixed RUN_NONINTERACTIVE and RUN_WITH_LAST_VALS. 
 *              There were uninitialized variables.
 *                                        --Sven <sven@gimp.org>
 */

38
39
#include "config.h"

Elliot Lee's avatar
Elliot Lee committed
40
41
#include <stdio.h>
#include <stdlib.h>
42
43
44

#include <gtk/gtk.h>

45
46
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
47

48
#include "libgimp/stdplugins-intl.h"
Elliot Lee's avatar
Elliot Lee committed
49

50
51
#define	SCALE_WIDTH  128
#define PREVIEW_SIZE 128
52

Elliot Lee's avatar
Elliot Lee committed
53
54
55
/* datastructure to store parameters in */
typedef struct
{
56
57
58
59
60
61
  guchar  fromred, fromgreen, fromblue;
  guchar  tored, togreen, toblue;
  guchar  red_threshold, green_threshold, blue_threshold;
  gint32  image;
  gint32  drawable;
} myParams;
Elliot Lee's avatar
Elliot Lee committed
62
63

/* lets prototype */
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
static void	query (void);
static void	run   (gchar   *name,
		       gint     nparams,
		       GParam  *param,
		       gint    *nreturn_vals,
		       GParam **return_vals);

static void	exchange      (void);
static void	real_exchange (gint, gint, gint, gint, int);

static int	doDialog              (void);
static void	update_preview        (void);
static void	ok_callback           (GtkWidget *, gpointer);
static void	lock_callback         (GtkWidget *, gpointer);
static void	color_button_callback (GtkWidget *, gpointer);
static void	scale_callback        (GtkAdjustment *, gpointer);
Elliot Lee's avatar
Elliot Lee committed
80
81

/* some global variables */
82
83
84
85
86
87
88
89
90
91
92
GDrawable *drw;
gboolean   has_alpha;
myParams   xargs = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
gint       running = 0;
GPixelRgn  origregion;
GtkWidget *preview;
GtkWidget *from_colorbutton;
GtkWidget *to_colorbutton;
gint       sel_x1, sel_y1, sel_x2, sel_y2;
gint       prev_width, prev_height, sel_width, sel_height;
gint       lock_thres = 0;
Elliot Lee's avatar
Elliot Lee committed
93
94
95
96

/* lets declare what we want to do */
GPlugInInfo PLUG_IN_INFO =
{
97
98
99
100
  NULL,  /* init_proc  */
  NULL,  /* quit_proc  */
  query, /* query_proc */
  run,   /* run_proc   */
Elliot Lee's avatar
Elliot Lee committed
101
102
103
104
105
106
};

/* run program */
MAIN()

/* tell GIMP who we are */
107
108
static void
query (void)
Elliot Lee's avatar
Elliot Lee committed
109
{
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
  static GParamDef args[] =
  {
    { PARAM_INT32, "run_mode", "Interactive" },
    { PARAM_IMAGE, "image", "Input image" },
    { PARAM_DRAWABLE, "drawable", "Input drawable" },
    { PARAM_INT8, "fromred", "Red value (from)" },
    { PARAM_INT8, "fromgreen", "Green value (from)" },
    { PARAM_INT8, "fromblue", "Blue value (from)" },
    { PARAM_INT8, "tored", "Red value (to)" },
    { PARAM_INT8, "togreen", "Green value (to)" },
    { PARAM_INT8, "toblue", "Blue value (to)" },
    { PARAM_INT8, "red_threshold", "Red threshold" },
    { PARAM_INT8, "green_threshold", "Green threshold" },
    { PARAM_INT8, "blue_threshold", "Blue threshold" },
  };
  static GParamDef *return_vals = NULL;
  static int nargs = sizeof(args) / sizeof(args[0]);
  static int nreturn_vals = 0;

  INIT_I18N();

  gimp_install_procedure ("plug_in_exchange",
			  _("Color Exchange"),
			  _("Exchange one color with another, optionally setting a threshold to convert from one shade to another"),
			  "robert@experimental.net",
			  "robert@experimental.net",
			  "June 17th, 1997",
			  N_("<Image>/Filters/Colors/Map/Color Exchange..."),
			  "RGB*",
			  PROC_PLUG_IN,
			  nargs, nreturn_vals,
			  args, return_vals);
Elliot Lee's avatar
Elliot Lee committed
142
143
144
}

/* main function */
145
146
147
148
149
150
static void
run (gchar   *name,
     gint     nparams,
     GParam  *param,
     gint    *nreturn_vals,
     GParam **return_vals)
Elliot Lee's avatar
Elliot Lee committed
151
{
152
153
154
  static GParam	values[1];
  GRunModeType	runmode;
  GStatusType 	status = STATUS_SUCCESS;
Elliot Lee's avatar
Elliot Lee committed
155

156
157
  *nreturn_vals = 1;
  *return_vals = values;
Elliot Lee's avatar
Elliot Lee committed
158

159
160
  values[0].type = PARAM_STATUS;
  values[0].data.d_status = status;
Elliot Lee's avatar
Elliot Lee committed
161

162
163
164
165
  runmode        = param[0].data.d_int32;
  xargs.image    = param[1].data.d_image;
  xargs.drawable = param[2].data.d_drawable;
  drw = gimp_drawable_get (xargs.drawable);
166

167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
  switch (runmode)
    {
    case RUN_INTERACTIVE:
      INIT_I18N_UI();
      /* retrieve stored arguments (if any) */
      gimp_get_data ("plug_in_exchange", &xargs);
      /* initialize using foreground color */
      gimp_palette_get_foreground (&xargs.fromred,
				   &xargs.fromgreen,
				   &xargs.fromblue);
      /* and initialize some other things */
      gimp_drawable_mask_bounds (drw->id, &sel_x1, &sel_y1, &sel_x2, &sel_y2);
      sel_width = sel_x2 - sel_x1;
      sel_height = sel_y2 - sel_y1;
      if (sel_width > PREVIEW_SIZE)
	prev_width = PREVIEW_SIZE;
      else
	prev_width = sel_width;
      if (sel_height > PREVIEW_SIZE)
	prev_height = PREVIEW_SIZE;
      else
	prev_height = sel_height;
      has_alpha = gimp_drawable_has_alpha (drw->id);
      if (!doDialog ())
	return;
      break;

    case RUN_WITH_LAST_VALS:
      INIT_I18N();
      gimp_get_data ("plug_in_exchange", &xargs);
      /* 
       * instead of recalling the last-set values,
       * run with the current foreground as 'from'
       * color, making ALT-F somewhat more useful.
       */
      gimp_palette_get_foreground (&xargs.fromred,
				   &xargs.fromgreen,
				   &xargs.fromblue);
      break;

    case RUN_NONINTERACTIVE:
      INIT_I18N();
      if (nparams != 10)
	status = STATUS_EXECUTION_ERROR;
      if (status == STATUS_SUCCESS)
Elliot Lee's avatar
Elliot Lee committed
212
	{
213
214
215
216
217
218
219
220
221
	  xargs.fromred         = param[3].data.d_int8;
	  xargs.fromgreen       = param[4].data.d_int8;
	  xargs.fromblue        = param[5].data.d_int8;
	  xargs.tored           = param[6].data.d_int8;
	  xargs.togreen         = param[7].data.d_int8;
	  xargs.toblue          = param[8].data.d_int8;
	  xargs.red_threshold   = param[9].data.d_int32;
	  xargs.green_threshold = param[10].data.d_int32;
	  xargs.blue_threshold  = param[11].data.d_int32;
Elliot Lee's avatar
Elliot Lee committed
222
	}
223
224
225
226
227
228
229
230
      break;
    default:	
      break;
    }

  if (status == STATUS_SUCCESS)
    {
      if (gimp_drawable_is_rgb (drw->id))
Elliot Lee's avatar
Elliot Lee committed
231
	{
232
233
234
235
236
237
238
239
240
241
242
243
	  gimp_progress_init (_("Color Exchange..."));
	  gimp_tile_cache_ntiles (2 * (drw->width / gimp_tile_width () + 1));
	  exchange ();	
	  gimp_drawable_detach( drw);

	  /* store our settings */
	  if (runmode == RUN_INTERACTIVE)
	    gimp_set_data ("plug_in_exchange", &xargs, sizeof (myParams));

	  /* and flush */
	  if (runmode != RUN_NONINTERACTIVE)
	    gimp_displays_flush ();
Elliot Lee's avatar
Elliot Lee committed
244
	}
245
246
247
248
      else
	status = STATUS_EXECUTION_ERROR;
    }
  values[0].data.d_status = status;
Elliot Lee's avatar
Elliot Lee committed
249
250
251
}

/* do the exchanging */
252
253
static void
exchange (void)
Elliot Lee's avatar
Elliot Lee committed
254
{
255
256
  /* do the real exchange */
  real_exchange (-1, -1, -1, -1, FALSE);
Elliot Lee's avatar
Elliot Lee committed
257
258
259
}

/* show our dialog */
260
static gint
261
doDialog (void)
Elliot Lee's avatar
Elliot Lee committed
262
{
263
264
265
266
267
268
269
270
271
272
  GtkWidget *dialog;
  GtkWidget *mainbox;
  GtkWidget *frame;
  GtkWidget *table;
  GtkWidget *colorbutton;
  GtkObject *adj;
  guchar  *color_cube;
  gchar	 **argv;
  gint     argc;
  gint     framenumber;
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311

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

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

  /* stuff for preview */
  gtk_preview_set_gamma (gimp_gamma ());
  gtk_preview_set_install_cmap (gimp_install_cmap ()); 
  color_cube = gimp_color_cube ();
  gtk_preview_set_color_cube (color_cube[0], color_cube[1],
			      color_cube[2], color_cube[3]); 
  gtk_widget_set_default_visual (gtk_preview_get_visual ());
  gtk_widget_set_default_colormap (gtk_preview_get_cmap ());

  /* load pixelregion */
  gimp_pixel_rgn_init (&origregion, drw,
		       0, 0, PREVIEW_SIZE, PREVIEW_SIZE, FALSE, FALSE);

  /* set up the dialog */
  dialog = gimp_dialog_new (_("Color Exchange"), "exchange",
			    gimp_plugin_help_func, "filters/exchange.html",
			    GTK_WIN_POS_MOUSE,
			    FALSE, TRUE, FALSE,

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

			    NULL);

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

  /* do some boxes here */
312
313
  mainbox = gtk_vbox_new (FALSE, 4);
  gtk_container_set_border_width (GTK_CONTAINER (mainbox), 6);
314
315
316
317
318
  gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox), mainbox,
		      TRUE, TRUE, 0);

  frame = gtk_frame_new (_("Preview"));
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
319
  gtk_box_pack_start (GTK_BOX (mainbox), frame, FALSE, FALSE, 0);
320
321
322
323
324
325
326
327
328
329
330
  gtk_widget_show (frame);

  preview = gtk_preview_new (GTK_PREVIEW_COLOR);
  gtk_preview_size (GTK_PREVIEW (preview), prev_width, prev_height);
  gtk_container_add (GTK_CONTAINER (frame), preview);
  update_preview ();
  gtk_widget_show (preview); 

  /* and our scales */
  for (framenumber = 0; framenumber < 2; framenumber++)
    {
331
332
333
      guint id;

      frame = gtk_frame_new (framenumber ? _("To Color") : _("From Color"));
334
      gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
335
      gtk_box_pack_start (GTK_BOX (mainbox), frame, FALSE, FALSE, 0);
336
      gtk_widget_show (frame);
337
338
339
340
341

      table = gtk_table_new (framenumber ? 3 : 9, 4, 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);
342
      gtk_container_add (GTK_CONTAINER (frame), table);
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
      gtk_widget_show (table);

      colorbutton = gimp_color_button_new (framenumber ?
					   _("Color Exchange: To Color") :
					   _("Color Exchange: From Color"),
					   SCALE_WIDTH / 2, 16,
					   framenumber ?
					   &xargs.tored : &xargs.fromred,
					   3);
      gimp_table_attach_aligned (GTK_TABLE (table), 0,
				 NULL, 0.0, 0.0,
				 colorbutton, TRUE);
      gtk_signal_connect (GTK_OBJECT (colorbutton), "color_changed",
			  GTK_SIGNAL_FUNC (color_button_callback),
			  NULL);

      if (framenumber)
	to_colorbutton = colorbutton;
      else
	from_colorbutton = colorbutton;

      adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
				  _("Red:"), SCALE_WIDTH, 0,
				  framenumber ? xargs.tored : xargs.fromred,
				  0, 255, 1, 8, 0, NULL, NULL);
      gtk_object_set_user_data (GTK_OBJECT (adj), colorbutton);
      gtk_object_set_data (GTK_OBJECT (colorbutton), "red", adj);
      id = gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
			       GTK_SIGNAL_FUNC (scale_callback),
			       framenumber ? &xargs.tored : &xargs.fromred);
      gtk_object_set_data (GTK_OBJECT (adj), "handler", (gpointer) id);

375
      if (! framenumber)
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
	{
	  adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
				      _("Red Threshold:"), SCALE_WIDTH, 0,
				      xargs.red_threshold,
				      0, 255, 1, 8, 0, NULL, NULL);
	  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
			      GTK_SIGNAL_FUNC (scale_callback),
			      &xargs.red_threshold);
	}

      adj = gimp_scale_entry_new (GTK_TABLE (table), 0, framenumber ? 2 : 3,
				  _("Green:"), SCALE_WIDTH, 0,
				  framenumber ? xargs.togreen : xargs.fromgreen,
				  0, 255, 1, 8, 0, NULL, NULL);
      gtk_object_set_user_data (GTK_OBJECT (adj), colorbutton);
      gtk_object_set_data (GTK_OBJECT (colorbutton), "green", adj);
      id = gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
			       GTK_SIGNAL_FUNC (scale_callback),
			       framenumber ? &xargs.togreen : &xargs.fromgreen);
      gtk_object_set_data (GTK_OBJECT (adj), "handler", (gpointer) id);

397
      if (! framenumber)
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
	{
	  adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 4,
				      _("Green Threshold:"), SCALE_WIDTH, 0,
				      xargs.green_threshold,
				      0, 255, 1, 8, 0, NULL, NULL);
	  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
			      GTK_SIGNAL_FUNC (scale_callback),
			      &xargs.green_threshold);
	}

      adj = gimp_scale_entry_new (GTK_TABLE (table), 0, framenumber ? 3 : 5,
				  _("Blue:"), SCALE_WIDTH, 0,
				  framenumber ? xargs.toblue : xargs.fromblue,
				  0, 255, 1, 8, 0, NULL, NULL);
      gtk_object_set_user_data (GTK_OBJECT (adj), colorbutton);
      gtk_object_set_data (GTK_OBJECT (colorbutton), "blue", adj);
      id = gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
			       GTK_SIGNAL_FUNC (scale_callback),
			       framenumber ? &xargs.toblue : &xargs.fromblue);
      gtk_object_set_data (GTK_OBJECT (adj), "handler", (gpointer) id);

419
      if (! framenumber)
420
421
422
423
424
425
426
427
428
429
	{
	  adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 6,
				      _("Blue Threshold:"), SCALE_WIDTH, 0,
				      xargs.blue_threshold,
				      0, 255, 1, 8, 0, NULL, NULL);
	  gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
			      GTK_SIGNAL_FUNC (scale_callback),
			      &xargs.blue_threshold);
	}

430
      if (! framenumber)
Elliot Lee's avatar
Elliot Lee committed
431
	{
432
433
	  GtkWidget *button;

434
435
	  button = gtk_check_button_new_with_label (_("Lock Thresholds"));
	  gtk_table_attach (GTK_TABLE (table), button, 1, 3, 7, 8,
436
437
			    GTK_FILL, 0, 0, 0);
	  gtk_signal_connect (GTK_OBJECT (button), "clicked",
438
			      GTK_SIGNAL_FUNC (lock_callback),
439
440
			      dialog);
	  gtk_widget_show (button);
Elliot Lee's avatar
Elliot Lee committed
441
	}
442
443
444
445
446
    }

  /* show everything */
  gtk_widget_show (mainbox);
  gtk_widget_show (dialog);
Elliot Lee's avatar
Elliot Lee committed
447

448
449
  gtk_main ();
  gdk_flush ();
Elliot Lee's avatar
Elliot Lee committed
450

451
  return running;
Elliot Lee's avatar
Elliot Lee committed
452
453
}

454
455
456
static void
ok_callback (GtkWidget *widget,
	     gpointer   data)
Elliot Lee's avatar
Elliot Lee committed
457
{
458
  running = TRUE;
Elliot Lee's avatar
Elliot Lee committed
459

460
  gtk_widget_destroy (GTK_WIDGET (data));
Elliot Lee's avatar
Elliot Lee committed
461
462
}

463
464
465
static void
lock_callback (GtkWidget *widget,
	       gpointer   data)
466
{
467
  lock_thres = 1 - lock_thres;
468
469
}

470
471
472
static void
color_button_callback (GtkWidget *widget,
		       gpointer   data)
Elliot Lee's avatar
Elliot Lee committed
473
{
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
  GtkObject *red_adj;
  GtkObject *green_adj;
  GtkObject *blue_adj;

  guint red_handler;
  guint green_handler;
  guint blue_handler;

  red_adj   = (GtkObject *) gtk_object_get_data (GTK_OBJECT (widget), "red");
  green_adj = (GtkObject *) gtk_object_get_data (GTK_OBJECT (widget), "green");
  blue_adj  = (GtkObject *) gtk_object_get_data (GTK_OBJECT (widget), "blue");

  red_handler   = (guint) gtk_object_get_data (GTK_OBJECT (red_adj),
					       "handler");
  green_handler = (guint) gtk_object_get_data (GTK_OBJECT (green_adj),
					       "handler");
  blue_handler  = (guint) gtk_object_get_data (GTK_OBJECT (blue_adj),
					       "handler");

  gtk_signal_handler_block (GTK_OBJECT (red_adj),   red_handler);
  gtk_signal_handler_block (GTK_OBJECT (green_adj), green_handler);
  gtk_signal_handler_block (GTK_OBJECT (blue_adj),  blue_handler);

  if (widget == from_colorbutton)
    {
      gtk_adjustment_set_value (GTK_ADJUSTMENT (red_adj),   xargs.fromred);
      gtk_adjustment_set_value (GTK_ADJUSTMENT (green_adj), xargs.fromgreen);
      gtk_adjustment_set_value (GTK_ADJUSTMENT (blue_adj),  xargs.fromblue);
    }
  else
    {
      gtk_adjustment_set_value (GTK_ADJUSTMENT (red_adj),   xargs.tored);
      gtk_adjustment_set_value (GTK_ADJUSTMENT (green_adj), xargs.togreen);
      gtk_adjustment_set_value (GTK_ADJUSTMENT (blue_adj),  xargs.toblue);
    }
Elliot Lee's avatar
Elliot Lee committed
509

510
511
512
513
514
  gtk_signal_handler_unblock (GTK_OBJECT (red_adj),   red_handler);
  gtk_signal_handler_unblock (GTK_OBJECT (green_adj), green_handler);
  gtk_signal_handler_unblock (GTK_OBJECT (blue_adj),  blue_handler);

  update_preview ();
515
516
}

517
518
519
static void
scale_callback (GtkAdjustment *adj,
		gpointer       data)
520
{
521
522
523
524
525
526
527
528
529
530
531
  GtkWidget *colorbutton;
  guchar *val = data;

  *val = (guchar) adj->value;

  colorbutton = gtk_object_get_user_data (GTK_OBJECT (adj));

  if (colorbutton)
    gimp_color_button_update (GIMP_COLOR_BUTTON (colorbutton));

  update_preview ();
532
533
}

534
535
static void
update_preview (void)
536
{
537
538
539
  real_exchange (sel_x1, sel_y1,
		 sel_x1 + prev_width, sel_y1 + prev_height,
		 TRUE);
540

541
542
  gtk_widget_draw (preview, NULL);
  gdk_flush ();
Elliot Lee's avatar
Elliot Lee committed
543
}
544

545
546
547
548
549
550
551
552
553
554
555
static void
real_exchange (gint x1,
	       gint y1,
	       gint x2,
	       gint y2,
	       gint dopreview)
{
  GPixelRgn  srcPR, destPR;
  guchar    *src_row, *dest_row;
  gint       x, y, bpp = drw->bpp;
  gint       width, height;
556

557
558
559
560
561
562
563
564
  /* fill if necessary */
  if (x1 == -1 || y1 == -1 || x2 == -1 || y2 == -1)
    {
      x1 = sel_x1;
      y1 = sel_y1;
      x2 = sel_x2;
      y2 = sel_y2;
    }
565

566
567
568
  /* check for valid coordinates */
  width  = x2 - x1;
  height = y2 - y1;
569

570
571
  /* allocate memory */
  src_row  = g_new (guchar, drw->width * bpp);
572

573
574
575
576
  if (dopreview && has_alpha)
    dest_row = g_new (guchar, drw->width * (bpp - 1));
  else
    dest_row = g_new (guchar, drw->width * bpp);
577

578
579
580
581
582
  /* initialize the pixel regions */
  /*
    gimp_pixel_rgn_init (&srcPR, drw, x1, y1, width, height, FALSE, FALSE);
  */
  gimp_pixel_rgn_init (&srcPR, drw, 0, 0, drw->width, drw->height, FALSE, FALSE);
583

584
585
  if (! dopreview)
    gimp_pixel_rgn_init (&destPR, drw, 0, 0, width, height, TRUE, TRUE);
586

587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
  for (y = y1; y < y2; y++)
    {
      gimp_pixel_rgn_get_row (&srcPR, src_row, 0, y, drw->width);
      for (x = x1; x < x2; x++)
	{
	  gint pixel_red, pixel_green, pixel_blue;
	  gint min_red, max_red, min_green, max_green, min_blue, max_blue;
	  gint new_red, new_green, new_blue;
	  gint idx, rest;

	  /* get boundary values */
	  min_red   = MAX (xargs.fromred - xargs.red_threshold, 0);
	  min_green = MAX (xargs.fromgreen - xargs.green_threshold, 0);
	  min_blue  = MAX (xargs.fromblue - xargs.blue_threshold, 0);

	  max_red   = MIN (xargs.fromred + xargs.red_threshold, 255);
	  max_green = MIN (xargs.fromgreen + xargs.green_threshold, 255);
	  max_blue  = MIN (xargs.fromblue + xargs.blue_threshold, 255);

	  /* get current pixel-values */
	  pixel_red   = src_row[x * bpp];
	  pixel_green = src_row[x * bpp + 1];
	  pixel_blue  = src_row[x * bpp + 2];

	  /* shift down for preview */
	  if (dopreview)
	    {
	      if (has_alpha)
		idx = (x - x1) * (bpp - 1);
	      else
		idx = (x - x1) * bpp;
	    }
	  else
	    idx = x * bpp;

	  /* want this pixel? */
	  if (pixel_red >= min_red &&
	      pixel_red <= max_red &&
	      pixel_green >= min_green &&
	      pixel_green <= max_green &&
	      pixel_blue >= min_blue &&
	      pixel_blue <= max_blue)
	    {
	      gint red_delta, green_delta, blue_delta;

	      red_delta   = pixel_red - xargs.fromred;
	      green_delta = pixel_green - xargs.fromgreen;
	      blue_delta  = pixel_blue - xargs.fromblue;
	      new_red   = (guchar) CLAMP (xargs.tored + red_delta, 0, 255);
	      new_green = (guchar) CLAMP (xargs.togreen + green_delta, 0, 255);
	      new_blue  = (guchar) CLAMP (xargs.toblue + blue_delta, 0, 255);
	    }
	  else
	    {
	      new_red   = pixel_red;
	      new_green = pixel_green;
	      new_blue  = pixel_blue;
	    }

	  /* fill buffer (cast it too) */
	  dest_row[idx + 0] = (guchar) new_red;
	  dest_row[idx + 1] = (guchar) new_green;
	  dest_row[idx + 2] = (guchar) new_blue;

	  /* copy rest (most likely alpha-channel) */
	  for (rest = 3; rest < bpp; rest++)
	    dest_row[idx + rest] = src_row[x * bpp + rest];
	}
      /* store the dest */
      if (dopreview)
	gtk_preview_draw_row (GTK_PREVIEW (preview), dest_row, 0, y - y1, width);
      else
	gimp_pixel_rgn_set_row (&destPR, dest_row, 0, y, drw->width);
      /* and tell the user what we're doing */
      if (! dopreview && (y % 10) == 0)
	gimp_progress_update ((double) y / (double) height);
    }
  g_free(src_row);
  g_free(dest_row);
  if (! dopreview)
    {
      /* update the processed region */
      gimp_drawable_flush (drw);
      gimp_drawable_merge_shadow (drw->id, TRUE);
      gimp_drawable_update (drw->id, x1, y1, width, height);
    }
}