gimpchannel.c 37.4 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
/* 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
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
29
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <math.h>
#include "appenv.h"
#include "channel.h"
#include "drawable.h"
#include "errors.h"
#include "gimage_mask.h"
#include "layer.h"
#include "paint_funcs.h"
30
#include "parasitelist.h"
Elliot Lee's avatar
Elliot Lee committed
31
32
#include "temp_buf.h"
#include "undo.h"
33
#include "gimppreviewcache.h"
Elliot Lee's avatar
Elliot Lee committed
34

35
36
#include "libgimp/gimpintl.h"

37
#include "channel_pvt.h"
scott's avatar
scott committed
38
#include "tile.h"
39

40
41
42
#include "gimplut.h"
#include "lut_funcs.h"

scott's avatar
scott committed
43
/*
44
45
46
enum {
  LAST_SIGNAL
};
scott's avatar
scott committed
47
*/
48
49
50
51
52

static void gimp_channel_class_init (GimpChannelClass *klass);
static void gimp_channel_init       (GimpChannel      *channel);
static void gimp_channel_destroy    (GtkObject        *object);

scott's avatar
scott committed
53
/*
54
static gint channel_signals[LAST_SIGNAL] = { 0 };
scott's avatar
scott committed
55
*/
56
57
58

static GimpDrawableClass *parent_class = NULL;

59
GtkType
60
61
gimp_channel_get_type ()
{
62
  static GtkType channel_type = 0;
63
64
65
66
67
68
69
70
71
72

  if (!channel_type)
    {
      GtkTypeInfo channel_info =
      {
	"GimpChannel",
	sizeof (GimpChannel),
	sizeof (GimpChannelClass),
	(GtkClassInitFunc) gimp_channel_class_init,
	(GtkObjectInitFunc) gimp_channel_init,
73
74
        /* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
75
	(GtkClassInitFunc) NULL,
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
      };

      channel_type = gtk_type_unique (gimp_drawable_get_type (), &channel_info);
    }

  return channel_type;
}

static void
gimp_channel_class_init (GimpChannelClass *class)
{
  GtkObjectClass *object_class;

  object_class = (GtkObjectClass*) class;
  parent_class = gtk_type_class (gimp_drawable_get_type ());

scott's avatar
scott committed
92
  /*
93
  gtk_object_class_add_signals (object_class, channel_signals, LAST_SIGNAL);
scott's avatar
scott committed
94
  */
95
96
97
98
99
100
101
102

  object_class->destroy = gimp_channel_destroy;
}

static void
gimp_channel_init (GimpChannel *channel)
{
}
Elliot Lee's avatar
Elliot Lee committed
103
104
105
106
107
108

/*
 *  Static variables
 */
extern int global_drawable_ID;

109
int channel_get_count = 0;
Elliot Lee's avatar
Elliot Lee committed
110
111
112
113
114
115


/**************************/
/*  Function definitions  */

static void
116
channel_validate (TileManager *tm, Tile *tile)
Elliot Lee's avatar
Elliot Lee committed
117
118
{
  /*  Set the contents of the tile to empty  */
scott's avatar
scott committed
119
120
  memset (tile_data_pointer (tile, 0, 0), 
	  TRANSPARENT_OPACITY, tile_size(tile));
Elliot Lee's avatar
Elliot Lee committed
121
122
123
124
125
126
}




Channel *
127
channel_new (GimpImage* gimage, int width, int height, char *name, int opacity,
Elliot Lee's avatar
Elliot Lee committed
128
129
130
131
132
	     unsigned char *col)
{
  Channel * channel;
  int i;

133
  channel = gtk_type_new (gimp_channel_get_type ());
Elliot Lee's avatar
Elliot Lee committed
134

135
  gimp_drawable_configure (GIMP_DRAWABLE(channel), 
136
			   gimage, width, height, GRAY_GIMAGE, name);
Elliot Lee's avatar
Elliot Lee committed
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158

  /*  set the channel color and opacity  */
  for (i = 0; i < 3; i++)
    channel->col[i] = col[i];
  channel->opacity = opacity;
  channel->show_masked = 1;

  /*  selection mask variables  */
  channel->empty = TRUE;
  channel->segs_in = NULL;
  channel->segs_out = NULL;
  channel->num_segs_in = 0;
  channel->num_segs_out = 0;
  channel->bounds_known = TRUE;
  channel->boundary_known = TRUE;
  channel->x1 = channel->y1 = 0;
  channel->x2 = width;
  channel->y2 = height;

  return channel;
}

scott's avatar
scott committed
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
Channel *
channel_ref (Channel *channel)
{
  gtk_object_ref  (GTK_OBJECT (channel));
  gtk_object_sink (GTK_OBJECT (channel));
  return channel;
}


void
channel_unref (Channel *channel)
{
  gtk_object_unref (GTK_OBJECT (channel));
}

Elliot Lee's avatar
Elliot Lee committed
174
175
176
177
178
179
180

Channel *
channel_copy (Channel *channel)
{
  char * channel_name;
  Channel * new_channel;
  PixelRegion srcPR, destPR;
181
182
183
  char *ext;
  int number;
  char *name;
184
  int len;
Elliot Lee's avatar
Elliot Lee committed
185
186

  /*  formulate the new channel name  */
187
188
  name = channel_get_name(channel);
  ext = strrchr(name, '#');
189
190
191
192
193
194
195
  len = strlen (_("copy"));
  if ((strlen(name) >= len &&
       strcmp(&name[strlen(name) - len], _("copy")) == 0) ||
      (ext && (number = atoi(ext + 1)) > 0 && 
       ((int)(log10(number) + 1)) == strlen(ext + 1)))
    /* don't have redundant "copy"s */
    channel_name = g_strdup (name);
196
  else
197
    channel_name = g_strdup_printf (_("%s copy"), name);
Elliot Lee's avatar
Elliot Lee committed
198
199

  /*  allocate a new channel object  */
200
  new_channel = channel_new (GIMP_DRAWABLE(channel)->gimage, 
201
202
203
204
			     GIMP_DRAWABLE(channel)->width, 
			     GIMP_DRAWABLE(channel)->height, 
			     channel_name, channel->opacity, channel->col);
  GIMP_DRAWABLE(new_channel)->visible = GIMP_DRAWABLE(channel)->visible;
Elliot Lee's avatar
Elliot Lee committed
205
206
207
  new_channel->show_masked = channel->show_masked;

  /*  copy the contents across channels  */
208
209
210
211
  pixel_region_init (&srcPR, GIMP_DRAWABLE(channel)->tiles, 0, 0, 
		     GIMP_DRAWABLE(channel)->width, 
		     GIMP_DRAWABLE(channel)->height, FALSE);
  pixel_region_init (&destPR, GIMP_DRAWABLE(new_channel)->tiles, 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height, TRUE);
Elliot Lee's avatar
Elliot Lee committed
212
213
  copy_region (&srcPR, &destPR);

214
215
  /* copy the parasites */
  GIMP_DRAWABLE(new_channel)->parasites 
216
    = parasite_list_copy(GIMP_DRAWABLE(channel)->parasites);
217

Elliot Lee's avatar
Elliot Lee committed
218
219
220
221
222
223
224
  /*  free up the channel_name memory  */
  g_free (channel_name);

  return new_channel;
}


225
226
227
228
229
230
231
232
233
234
235
236
void
channel_set_name (Channel *channel, char *name)
{
  gimp_drawable_set_name(GIMP_DRAWABLE(channel), name);
}

char *
channel_get_name (Channel *channel)
{
  return gimp_drawable_get_name(GIMP_DRAWABLE(channel));
}

237
238
239
240
241
242
243
244
245
246
247
void 
channel_set_color (Channel *channel, gchar *color)
{
int i;
  if (color)
    {  
    for (i = 0; i < 3; i++)
      channel->col[i] = color[i];
    }
} 

248
249
250
251
252
253
254
255
256
257
258
259
char *
channel_get_color (Channel *channel)
{
  return (GIMP_CHANNEL(channel)->col); 
}
 
int
channel_get_opacity (Channel *channel)
{ 
  return channel->opacity;
}

260
261
262
263
264
265
266
void 
channel_set_opacity (Channel *channel, gint opacity)
{
  if (opacity >=0 && opacity <= 100)
    channel->opacity = (int) (opacity*255)/100;
}

Elliot Lee's avatar
Elliot Lee committed
267
268
269
Channel *
channel_get_ID (int ID)
{
270
271
272
273
274
275
  GimpDrawable *drawable;
  drawable = drawable_get_ID (ID);
  if (drawable && GIMP_IS_CHANNEL (drawable)) 
    return GIMP_CHANNEL (drawable);
  else
    return NULL;
Elliot Lee's avatar
Elliot Lee committed
276
277
278
279
280
281
}


void
channel_delete (Channel *channel)
{
scott's avatar
scott committed
282
  gtk_object_unref (GTK_OBJECT (channel));
283
284
285
286
287
288
289
290
291
292
293
294
}

static void
gimp_channel_destroy (GtkObject *object)
{
  GimpChannel *channel;

  g_return_if_fail (object != NULL);
  g_return_if_fail (GIMP_IS_CHANNEL (object));

  channel = GIMP_CHANNEL (object);

Elliot Lee's avatar
Elliot Lee committed
295
296
297
298
299
300
  /* free the segments?  */
  if (channel->segs_in)
    g_free (channel->segs_in);
  if (channel->segs_out)
    g_free (channel->segs_out);

301
302
303
  if (GTK_OBJECT_CLASS (parent_class)->destroy)
    (*GTK_OBJECT_CLASS (parent_class)->destroy) (object);
  
Elliot Lee's avatar
Elliot Lee committed
304
305
306
307
308
309
310
311
312
313
314
315
}

void
channel_scale (Channel *channel, int new_width, int new_height)
{
  PixelRegion srcPR, destPR;
  TileManager *new_tiles;

  if (new_width == 0 || new_height == 0)
    return;

  /*  Update the old channel position  */
316
  drawable_update (GIMP_DRAWABLE(channel), 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height);
Elliot Lee's avatar
Elliot Lee committed
317
318

  /*  Configure the pixel regions  */
319
  pixel_region_init (&srcPR, GIMP_DRAWABLE(channel)->tiles, 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height, FALSE);
Elliot Lee's avatar
Elliot Lee committed
320
321
322
323
324
325
326
327
328

  /*  Allocate the new channel, configure dest region  */
  new_tiles = tile_manager_new (new_width, new_height, 1);
  pixel_region_init (&destPR, new_tiles, 0, 0, new_width, new_height, TRUE);

  /*  Add an alpha channel  */
  scale_region (&srcPR, &destPR);

  /*  Push the channel on the undo stack  */
329
  undo_push_channel_mod (GIMP_DRAWABLE(channel)->gimage, channel);
Elliot Lee's avatar
Elliot Lee committed
330
331

  /*  Configure the new channel  */
332
333
334
  GIMP_DRAWABLE(channel)->tiles = new_tiles;
  GIMP_DRAWABLE(channel)->width = new_width;
  GIMP_DRAWABLE(channel)->height = new_height;
Elliot Lee's avatar
Elliot Lee committed
335
336
337
338
339

  /*  bounds are now unknown  */
  channel->bounds_known = FALSE;

  /*  Update the new channel position  */
340
  drawable_update (GIMP_DRAWABLE(channel), 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height);
Elliot Lee's avatar
Elliot Lee committed
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
}


void
channel_resize (Channel *channel, int new_width, int new_height,
		int offx, int offy)
{
  PixelRegion srcPR, destPR;
  TileManager *new_tiles;
  unsigned char bg = 0;
  int clear;
  int w, h;
  int x1, y1, x2, y2;

  if (!new_width || !new_height)
    return;

  x1 = BOUNDS (offx, 0, new_width);
  y1 = BOUNDS (offy, 0, new_height);
360
361
  x2 = BOUNDS ((offx + GIMP_DRAWABLE(channel)->width), 0, new_width);
  y2 = BOUNDS ((offy + GIMP_DRAWABLE(channel)->height), 0, new_height);
Elliot Lee's avatar
Elliot Lee committed
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
  w = x2 - x1;
  h = y2 - y1;

  if (offx > 0)
    {
      x1 = 0;
      x2 = offx;
    }
  else
    {
      x1 = -offx;
      x2 = 0;
    }

  if (offy > 0)
    {
      y1 = 0;
      y2 = offy;
    }
  else
    {
      y1 = -offy;
      y2 = 0;
    }

  /*  Update the old channel position  */
388
  drawable_update (GIMP_DRAWABLE(channel), 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height);
Elliot Lee's avatar
Elliot Lee committed
389
390

  /*  Configure the pixel regions  */
391
  pixel_region_init (&srcPR, GIMP_DRAWABLE(channel)->tiles, x1, y1, w, h, FALSE);
Elliot Lee's avatar
Elliot Lee committed
392
393

  /*  Determine whether the new channel needs to be initially cleared  */
394
395
  if ((new_width > GIMP_DRAWABLE(channel)->width) ||
      (new_height > GIMP_DRAWABLE(channel)->height) ||
Elliot Lee's avatar
Elliot Lee committed
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
      (x2 || y2))
    clear = TRUE;
  else
    clear = FALSE;

  /*  Allocate the new channel, configure dest region  */
  new_tiles = tile_manager_new (new_width, new_height, 1);

  /*  Set to black (empty--for selections)  */
  if (clear)
    {
      pixel_region_init (&destPR, new_tiles, 0, 0, new_width, new_height, TRUE);
      color_region (&destPR, &bg);
    }

  /*  copy from the old to the new  */
  pixel_region_init (&destPR, new_tiles, x2, y2, w, h, TRUE);
  if (w && h)
    copy_region (&srcPR, &destPR);

  /*  Push the channel on the undo stack  */
417
  undo_push_channel_mod (GIMP_DRAWABLE(channel)->gimage, channel);
Elliot Lee's avatar
Elliot Lee committed
418
419

  /*  Configure the new channel  */
420
421
422
  GIMP_DRAWABLE(channel)->tiles = new_tiles;
  GIMP_DRAWABLE(channel)->width = new_width;
  GIMP_DRAWABLE(channel)->height = new_height;
Elliot Lee's avatar
Elliot Lee committed
423
424
425
426
427

  /*  bounds are now unknown  */
  channel->bounds_known = FALSE;

  /*  update the new channel area  */
428
  drawable_update (GIMP_DRAWABLE(channel), 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height);
Elliot Lee's avatar
Elliot Lee committed
429
430
}

431
432
433
434
435
436
437
438
439
void            
channel_update (Channel *channel)
{
drawable_update (GIMP_DRAWABLE(channel), 0, 0,
                 GIMP_DRAWABLE(channel)->width,
                 GIMP_DRAWABLE(channel)->height);
gdisplays_flush ();
}

Elliot Lee's avatar
Elliot Lee committed
440
441
442
443
444
445
446
447
448
449
450
451
452
453

/********************/
/* access functions */

unsigned char *
channel_data (Channel *channel)
{
  return NULL;
}


int
channel_toggle_visibility (Channel *channel)
{
454
  GIMP_DRAWABLE(channel)->visible = !GIMP_DRAWABLE(channel)->visible;
Elliot Lee's avatar
Elliot Lee committed
455

456
  return GIMP_DRAWABLE(channel)->visible;
Elliot Lee's avatar
Elliot Lee committed
457
458
459
460
461
462
463
464
465
}


TempBuf *
channel_preview (Channel *channel, int width, int height)
{
  MaskBuf * preview_buf;
  PixelRegion srcPR, destPR;
  int subsample;
466
  TempBuf *ret_buf;
Elliot Lee's avatar
Elliot Lee committed
467
468

  /*  The easy way  */
469
  if (GIMP_DRAWABLE(channel)->preview_valid &&
470
471
472
      (ret_buf = gimp_preview_cache_get(&(GIMP_DRAWABLE(channel)->preview_cache),
					width,height)))
    return ret_buf;
Elliot Lee's avatar
Elliot Lee committed
473
474
475
476
477
  /*  The hard way  */
  else
    {
      /*  calculate 'acceptable' subsample  */
      subsample = 1;
478
479
      if (width < 1) width = 1;
      if (height < 1) height = 1;
480
481
      while ((width * (subsample + 1) * 2 < GIMP_DRAWABLE(channel)->width) &&
	     (height * (subsample + 1) * 2 < GIMP_DRAWABLE(channel)->height))
Elliot Lee's avatar
Elliot Lee committed
482
483
	subsample = subsample + 1;

484
      pixel_region_init (&srcPR, GIMP_DRAWABLE(channel)->tiles, 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height, FALSE);
Elliot Lee's avatar
Elliot Lee committed
485
486
487
488
489
490
491
492
493
494
495
496

      preview_buf = mask_buf_new (width, height);
      destPR.bytes = 1;
      destPR.x = 0;
      destPR.y = 0;
      destPR.w = width;
      destPR.h = height;
      destPR.rowstride = width;
      destPR.data = mask_buf_data (preview_buf);

      subsample_region (&srcPR, &destPR, subsample);

497
498
      if(!GIMP_DRAWABLE(channel)->preview_valid)
	gimp_preview_cache_invalidate(&(GIMP_DRAWABLE(channel)->preview_cache));
499
      GIMP_DRAWABLE(channel)->preview_valid = 1;
500
501
      gimp_preview_cache_add(&(GIMP_DRAWABLE(channel)->preview_cache),preview_buf);
      return preview_buf;
Elliot Lee's avatar
Elliot Lee committed
502
503
504
505
506
    }
}


void
507
channel_invalidate_previews (GimpImage* gimage)
Elliot Lee's avatar
Elliot Lee committed
508
{
509
  GSList * tmp;
Elliot Lee's avatar
Elliot Lee committed
510
  Channel * channel;
511
512

  tmp = gimage->channels;
Elliot Lee's avatar
Elliot Lee committed
513
514
515
516

  while (tmp)
    {
      channel = (Channel *) tmp->data;
517
      drawable_invalidate_preview (GIMP_DRAWABLE(channel));
518
      tmp = g_slist_next (tmp);
Elliot Lee's avatar
Elliot Lee committed
519
520
521
    }
}

522
Tattoo
523
524
525
526
527
channel_get_tattoo(const Channel *channel)
{
  return (gimp_drawable_get_tattoo(GIMP_DRAWABLE(channel)));
}

Elliot Lee's avatar
Elliot Lee committed
528
529
530
531
532
533

/****************************/
/* selection mask functions */


Channel *
534
channel_new_mask (GimpImage* gimage, int width, int height)
Elliot Lee's avatar
Elliot Lee committed
535
536
537
538
539
{
  unsigned char black[3] = {0, 0, 0};
  Channel *new_channel;

  /*  Create the new channel  */
540
  new_channel = channel_new (gimage, width, height, _("Selection Mask"), 127, black);
Elliot Lee's avatar
Elliot Lee committed
541
542

  /*  Set the validate procedure  */
543
  tile_manager_set_validate_proc (GIMP_DRAWABLE(new_channel)->tiles, channel_validate);
Elliot Lee's avatar
Elliot Lee committed
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566

  return new_channel;
}


int
channel_boundary (Channel *mask, BoundSeg **segs_in, BoundSeg **segs_out,
		  int *num_segs_in, int *num_segs_out,
		  int x1, int y1, int x2, int y2)
{
  int x3, y3, x4, y4;
  PixelRegion bPR;

  if (! mask->boundary_known)
    {
      /* free the out of date boundary segments */
      if (mask->segs_in)
	g_free (mask->segs_in);
      if (mask->segs_out)
	g_free (mask->segs_out);

      if (channel_bounds (mask, &x3, &y3, &x4, &y4))
	{
567
	  pixel_region_init (&bPR, GIMP_DRAWABLE(mask)->tiles, x3, y3, (x4 - x3), (y4 - y3), FALSE);
Elliot Lee's avatar
Elliot Lee committed
568
569
570
571
572
573
574
575
576
577
578
	  mask->segs_out = find_mask_boundary (&bPR, &mask->num_segs_out,
					       IgnoreBounds,
					       x1, y1,
					       x2, y2);
	  x1 = MAXIMUM (x1, x3);
	  y1 = MAXIMUM (y1, y3);
	  x2 = MINIMUM (x2, x4);
	  y2 = MINIMUM (y2, y4);

	  if (x2 > x1 && y2 > y1)
	    {
579
	      pixel_region_init (&bPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, FALSE);
Elliot Lee's avatar
Elliot Lee committed
580
581
582
583
584
585
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
	      mask->segs_in =  find_mask_boundary (&bPR, &mask->num_segs_in,
						   WithinBounds,
						   x1, y1,
						   x2, y2);
	    }
	  else
	    {
	      mask->segs_in = NULL;
	      mask->num_segs_in = 0;
	    }
	}
      else
	{
	  mask->segs_in = NULL;
	  mask->segs_out = NULL;
	  mask->num_segs_in = 0;
	  mask->num_segs_out = 0;
	}
      mask->boundary_known = TRUE;
    }

  *segs_in = mask->segs_in;
  *segs_out = mask->segs_out;
  *num_segs_in = mask->num_segs_in;
  *num_segs_out = mask->num_segs_out;

  return TRUE;
}


int
channel_value (Channel *mask, int x, int y)
{
  Tile *tile;
  int val;

  /*  Some checks to cut back on unnecessary work  */
  if (mask->bounds_known)
    {
      if (mask->empty)
	return 0;
      else if (x < mask->x1 || x >= mask->x2 || y < mask->y1 || y >= mask->y2)
	return 0;
    }
  else
    {
626
      if (x < 0 || x >= GIMP_DRAWABLE(mask)->width || y < 0 || y >= GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
627
628
629
	return 0;
    }

630
  tile = tile_manager_get_tile (GIMP_DRAWABLE(mask)->tiles, x, y, TRUE, FALSE);
scott's avatar
scott committed
631
  val = *(unsigned char *)(tile_data_pointer (tile, x % TILE_WIDTH, y % TILE_HEIGHT));
632
  tile_release (tile, FALSE);
Elliot Lee's avatar
Elliot Lee committed
633
634
635
636
637
638
639
640
641

  return val;
}


int
channel_bounds (Channel *mask, int *x1, int *y1, int *x2, int *y2)
{
  PixelRegion maskPR;
642
  unsigned char *data, *data1;
Elliot Lee's avatar
Elliot Lee committed
643
644
645
  int x, y;
  int ex, ey;
  void *pr;
646
647
  int tx1, tx2, ty1, ty2;
  int minx, maxx;
Elliot Lee's avatar
Elliot Lee committed
648
649
650
651
652
653
654
655
656
657
658
659
  /*  if the mask's bounds have already been reliably calculated...  */
  if (mask->bounds_known)
    {
      *x1 = mask->x1;
      *y1 = mask->y1;
      *x2 = mask->x2;
      *y2 = mask->y2;

      return (mask->empty) ? FALSE : TRUE;
    }

  /*  go through and calculate the bounds  */
660
661
662
663
  tx1 = GIMP_DRAWABLE(mask)->width;
  ty1 = GIMP_DRAWABLE(mask)->height;
  tx2 = 0;
  ty2 = 0;
Elliot Lee's avatar
Elliot Lee committed
664

665
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, FALSE);
Elliot Lee's avatar
Elliot Lee committed
666
667
  for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
    {
668
      data1 = data = maskPR.data;
Elliot Lee's avatar
Elliot Lee committed
669
670
      ex = maskPR.x + maskPR.w;
      ey = maskPR.y + maskPR.h;
671
672
      /* only check the pixels if this tile is not fully within the currently
	 computed bounds */
673
674
      if (maskPR.x < tx1 || ex > tx2 ||
	  maskPR.y < ty1 || ey > ty2)
675
        {
676
677
678
679
680
681
682
683
684
685
686
687
688
689
	  /* Check upper left and lower right corners to see if we can
	     avoid checking the rest of the pixels in this tile */
	  if (data[0] && data[maskPR.rowstride*(maskPR.h - 1) + maskPR.w - 1])
	  {
	    if (maskPR.x < tx1)
	      tx1 = maskPR.x;
	    if (ex > tx2)
	      tx2 = ex;
	    if (maskPR.y < ty1)
	      ty1 = maskPR.y;
	    if (ey > ty2)
	      ty2 = ey;
	  }
	  else
690
	    for (y = maskPR.y; y < ey; y++, data1 += maskPR.rowstride)
Elliot Lee's avatar
Elliot Lee committed
691
	    {
692
	      for (x = maskPR.x, data = data1; x < ex; x++, data++)
693
		if (*data)
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
		{
		  minx = x;
		  maxx = x;
		  for (; x < ex; x++, data++)
		    if (*data)
		      maxx = x;
		  if (minx < tx1)
		    tx1 = minx;
		  if (maxx > tx2)
		    tx2 = maxx;
		  if (y < ty1)
		    ty1 = y;
		  if (y > ty2)
		    ty2 = y;
	      }
Elliot Lee's avatar
Elliot Lee committed
709
710
711
712
	    }
	}
    }

713
714
  tx2 = BOUNDS (tx2 + 1, 0, GIMP_DRAWABLE(mask)->width);
  ty2 = BOUNDS (ty2 + 1, 0, GIMP_DRAWABLE(mask)->height);
Elliot Lee's avatar
Elliot Lee committed
715

716
  if (tx1 == GIMP_DRAWABLE(mask)->width && ty1 == GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
717
718
719
    {
      mask->empty = TRUE;
      mask->x1 = 0; mask->y1 = 0;
720
721
      mask->x2 = GIMP_DRAWABLE(mask)->width;
      mask->y2 = GIMP_DRAWABLE(mask)->height;
Elliot Lee's avatar
Elliot Lee committed
722
723
724
725
    }
  else
    {
      mask->empty = FALSE;
726
727
728
729
      mask->x1 = tx1;
      mask->y1 = ty1;
      mask->x2 = tx2;
      mask->y2 = ty2;
Elliot Lee's avatar
Elliot Lee committed
730
731
732
    }
  mask->bounds_known = TRUE;

733
734
735
736
737
  *x1 = tx1;
  *x2 = tx2;
  *y1 = ty1;
  *y2 = ty2;

Elliot Lee's avatar
Elliot Lee committed
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
  return (mask->empty) ? FALSE : TRUE;
}


int
channel_is_empty (Channel *mask)
{
  PixelRegion maskPR;
  unsigned char * data;
  int x, y;
  void * pr;

  if (mask->bounds_known)
    return mask->empty;

753
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, FALSE);
Elliot Lee's avatar
Elliot Lee committed
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
  for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
    {
      /*  check if any pixel in the mask is non-zero  */
      data = maskPR.data;
      for (y = 0; y < maskPR.h; y++)
	for (x = 0; x < maskPR.w; x++)
	  if (*data++)
	    {
	      pixel_regions_process_stop (pr);
	      return FALSE;
	    }
    }

  /*  The mask is empty, meaning we can set the bounds as known  */
  if (mask->segs_in)
    g_free (mask->segs_in);
  if (mask->segs_out)
    g_free (mask->segs_out);

  mask->empty = TRUE;
  mask->segs_in = NULL;
  mask->segs_out = NULL;
  mask->num_segs_in = 0;
  mask->num_segs_out = 0;
  mask->bounds_known = TRUE;
  mask->boundary_known = TRUE;
  mask->x1 = 0;  mask->y1 = 0;
781
782
  mask->x2 = GIMP_DRAWABLE(mask)->width;
  mask->y2 = GIMP_DRAWABLE(mask)->height;
Elliot Lee's avatar
Elliot Lee committed
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799

  return TRUE;
}


void
channel_add_segment (Channel *mask, int x, int y, int width, int value)
{
  PixelRegion maskPR;
  unsigned char *data;
  int val;
  int x2;
  void * pr;

  /*  check horizontal extents...  */
  x2 = x + width;
  if (x2 < 0) x2 = 0;
800
  if (x2 > GIMP_DRAWABLE(mask)->width) x2 = GIMP_DRAWABLE(mask)->width;
Elliot Lee's avatar
Elliot Lee committed
801
  if (x < 0) x = 0;
802
  if (x > GIMP_DRAWABLE(mask)->width) x = GIMP_DRAWABLE(mask)->width;
Elliot Lee's avatar
Elliot Lee committed
803
804
805
  width = x2 - x;
  if (!width) return;

806
  if (y < 0 || y > GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
807
808
    return;

809
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, x, y, width, 1, TRUE);
Elliot Lee's avatar
Elliot Lee committed
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
  for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
    {
      data = maskPR.data;
      width = maskPR.w;
      while (width--)
	{
	  val = *data + value;
	  if (val > 255)
	    val = 255;
	  *data++ = val;
	}
    }
}


void
channel_sub_segment (Channel *mask, int x, int y, int width, int value)
{
  PixelRegion maskPR;
  unsigned char *data;
  int val;
  int x2;
  void * pr;

  /*  check horizontal extents...  */
  x2 = x + width;
  if (x2 < 0) x2 = 0;
837
  if (x2 > GIMP_DRAWABLE(mask)->width) x2 = GIMP_DRAWABLE(mask)->width;
Elliot Lee's avatar
Elliot Lee committed
838
  if (x < 0) x = 0;
839
  if (x > GIMP_DRAWABLE(mask)->width) x = GIMP_DRAWABLE(mask)->width;
Elliot Lee's avatar
Elliot Lee committed
840
841
842
  width = x2 - x;
  if (!width) return;

843
  if (y < 0 || y > GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
844
845
    return;

846
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, x, y, width, 1, TRUE);
Elliot Lee's avatar
Elliot Lee committed
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
  for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
    {
      data = maskPR.data;
      width = maskPR.w;
      while (width--)
	{
	  val = *data - value;
	  if (val < 0)
	    val = 0;
	  *data++ = val;
	}
    }
}


void
863
channel_combine_rect (Channel *mask, int op, int x, int y, int w, int h)
Elliot Lee's avatar
Elliot Lee committed
864
{
865
  int x2, y2;
Elliot Lee's avatar
Elliot Lee committed
866
  PixelRegion maskPR;
867
868
869
  unsigned char color;
  y2 = y + h;
  x2 = x + w;
Elliot Lee's avatar
Elliot Lee committed
870

871
872
873
874
  x = BOUNDS (x, 0, GIMP_DRAWABLE(mask)->width);
  y = BOUNDS (y, 0, GIMP_DRAWABLE(mask)->height);
  x2 = BOUNDS (x2, 0, GIMP_DRAWABLE(mask)->width);
  y2 = BOUNDS (y2, 0, GIMP_DRAWABLE(mask)->height);
Elliot Lee's avatar
Elliot Lee committed
875

876
  if (x2 - x <= 0 || y2 - y <= 0)
Elliot Lee's avatar
Elliot Lee committed
877
878
    return;

879
880
881
882
883
884
885
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, x, y,
		     x2 - x, y2 - y, TRUE);
  if (op == ADD  || op == REPLACE)
    color = 255;
  else
    color = 0;
  color_region(&maskPR, &color);
Elliot Lee's avatar
Elliot Lee committed
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909

  /*  Determine new boundary  */
  if (mask->bounds_known && (op == ADD) && !mask->empty)
    {
      if (x < mask->x1)
	mask->x1 = x;
      if (y < mask->y1)
	mask->y1 = y;
      if ((x + w) > mask->x2)
	mask->x2 = (x + w);
      if ((y + h) > mask->y2)
	mask->y2 = (y + h);
    }
  else if (op == REPLACE || mask->empty)
    {
      mask->empty = FALSE;
      mask->x1 = x;
      mask->y1 = y;
      mask->x2 = x + w;
      mask->y2 = y + h;
    }
  else
    mask->bounds_known = FALSE;

910
911
912
913
  mask->x1 = BOUNDS (mask->x1, 0, GIMP_DRAWABLE(mask)->width);
  mask->y1 = BOUNDS (mask->y1, 0, GIMP_DRAWABLE(mask)->height);
  mask->x2 = BOUNDS (mask->x2, 0, GIMP_DRAWABLE(mask)->width);
  mask->y2 = BOUNDS (mask->y2, 0, GIMP_DRAWABLE(mask)->height);
Elliot Lee's avatar
Elliot Lee committed
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
}


void
channel_combine_ellipse (Channel *mask, int op, int x, int y, int w, int h,
			 int aa /*  antialias selection?  */)
{
  int i, j;
  int x0, x1, x2;
  int val, last;
  float a_sqr, b_sqr, aob_sqr;
  float w_sqr, h_sqr;
  float y_sqr;
  float t0, t1;
  float r;
  float cx, cy;
  float rad;
  float dist;


  if (!w || !h)
    return;

  a_sqr = (w * w / 4.0);
  b_sqr = (h * h / 4.0);
  aob_sqr = a_sqr / b_sqr;

  cx = x + w / 2.0;
  cy = y + h / 2.0;

  for (i = y; i < (y + h); i++)
    {
946
      if (i >= 0 && i < GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
	{
	  /*  Non-antialiased code  */
	  if (!aa)
	    {
	      y_sqr = (i + 0.5 - cy) * (i + 0.5 - cy);
	      rad = sqrt (a_sqr - a_sqr * y_sqr / (double) b_sqr);
	      x1 = ROUND (cx - rad);
	      x2 = ROUND (cx + rad);

	      switch (op)
		{
		case ADD: case REPLACE:
		  channel_add_segment (mask, x1, i, (x2 - x1), 255);
		  break;
		case SUB :
		  channel_sub_segment (mask, x1, i, (x2 - x1), 255);
		  break;
		}
	    }
	  /*  antialiasing  */
	  else
	    {
	      x0 = x;
	      last = 0;
	      h_sqr = (i + 0.5 - cy) * (i + 0.5 - cy);
	      for (j = x; j < (x + w); j++)
		{
		  w_sqr = (j + 0.5 - cx) * (j + 0.5 - cx);

		  if (h_sqr != 0)
		    {
		      t0 = w_sqr / h_sqr;
		      t1 = a_sqr / (t0 + aob_sqr);
		      r = sqrt (t1 + t0 * t1);
		      rad = sqrt (w_sqr + h_sqr);
		      dist = rad - r;
		    }
		  else
		    dist = -1.0;

		  if (dist < -0.5)
		    val = 255;
		  else if (dist < 0.5)
		    val = (int) (255 * (1 - (dist + 0.5)));
		  else
		    val = 0;
993
		  
Elliot Lee's avatar
Elliot Lee committed
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
		  if (last != val && last)
		    {
		      switch (op)
			{
			case ADD: case REPLACE:
			  channel_add_segment (mask, x0, i, j - x0, last);
			  break;
			case SUB:
			  channel_sub_segment (mask, x0, i, j - x0, last);
			  break;
			}
		    }

		  if (last != val)
		    {
		      x0 = j;
		      last = val;
1011
1012
1013
1014
		      /* because we are symetric accross the y axis we can
			 skip ahead a bit if we are inside the ellipse*/
		      if (val == 255 && j < cx)
			j = cx + (cx - j) - 1;
Elliot Lee's avatar
Elliot Lee committed
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
		    }
		}

	      if (last)
		{
		  if (op == ADD || op == REPLACE)
		    channel_add_segment (mask, x0, i, j - x0, last);
		  else if (op == SUB)
		    channel_sub_segment (mask, x0, i, j - x0, last);
		}
	    }

	}
    }

  /*  Determine new boundary  */
  if (mask->bounds_known && (op == ADD) && !mask->empty)
    {
      if (x < mask->x1)
	mask->x1 = x;
      if (y < mask->y1)
	mask->y1 = y;
      if ((x + w) > mask->x2)
	mask->x2 = (x + w);
      if ((y + h) > mask->y2)
	mask->y2 = (y + h);
    }
  else if (op == REPLACE || mask->empty)
    {
      mask->empty = FALSE;
      mask->x1 = x;
      mask->y1 = y;
      mask->x2 = x + w;
      mask->y2 = y + h;
    }
  else
    mask->bounds_known = FALSE;

1053
1054
1055
1056
  mask->x1 = BOUNDS (mask->x1, 0, GIMP_DRAWABLE(mask)->width);
  mask->y1 = BOUNDS (mask->y1, 0, GIMP_DRAWABLE(mask)->height);
  mask->x2 = BOUNDS (mask->x2, 0, GIMP_DRAWABLE(mask)->width);
  mask->y2 = BOUNDS (mask->y2, 0, GIMP_DRAWABLE(mask)->height);
Elliot Lee's avatar
Elliot Lee committed
1057
1058
1059
}


1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127

static void
channel_combine_sub_region_add (void *unused,
				PixelRegion *srcPR,
				PixelRegion *destPR)
{
  unsigned char *src, *dest;
  int x, y, val;
  src = srcPR->data;
  dest = destPR->data;
  for (y = 0; y < srcPR->h; y++)
  {
    for (x = 0; x < srcPR->w; x++)
    {
      val = dest[x] + src[x];
      if (val > 255)
	dest[x] = 255;
      else
	dest[x] = val;
    }
    src += srcPR->rowstride;
    dest += destPR->rowstride;
  }
}

static void
channel_combine_sub_region_sub (void *unused,
				PixelRegion *srcPR,
				PixelRegion *destPR)
{
  unsigned char *src, *dest;
  int x, y;
  src = srcPR->data;
  dest = destPR->data;
  for (y = 0; y < srcPR->h; y++)
  {
    for (x = 0; x < srcPR->w; x++)
    {
      if (src[x] > dest[x])
	dest[x] = 0;
      else
	dest[x]-= src[x];
    }
    src += srcPR->rowstride;
    dest += destPR->rowstride;
  }
}

static void
channel_combine_sub_region_intersect (void *unused,
				      PixelRegion *srcPR,
				      PixelRegion *destPR)
{
  unsigned char *src, *dest;
  int x, y;
  src = srcPR->data;
  dest = destPR->data;
  for (y = 0; y < srcPR->h; y++)
  {
    for (x = 0; x < srcPR->w; x++)
    {
      dest[x] = MINIMUM(dest[x], src[x]);
    }
    src += srcPR->rowstride;
    dest += destPR->rowstride;
  }
}

Elliot Lee's avatar
Elliot Lee committed
1128
1129
1130
1131
1132
1133
1134
1135
void
channel_combine_mask (Channel *mask, Channel *add_on, int op,
		      int off_x, int off_y)
{
  PixelRegion srcPR, destPR;
  int x1, y1, x2, y2;
  int w, h;

1136
1137
1138
1139
  x1 = BOUNDS (off_x, 0, GIMP_DRAWABLE(mask)->width);
  y1 = BOUNDS (off_y, 0, GIMP_DRAWABLE(mask)->height);
  x2 = BOUNDS (off_x + GIMP_DRAWABLE(add_on)->width, 0, GIMP_DRAWABLE(mask)->width);
  y2 = BOUNDS (off_y + GIMP_DRAWABLE(add_on)->height, 0, GIMP_DRAWABLE(mask)->height);
Elliot Lee's avatar
Elliot Lee committed
1140
1141
1142
1143

  w = (x2 - x1);
  h = (y2 - y1);

1144
1145
  pixel_region_init (&srcPR, GIMP_DRAWABLE(add_on)->tiles, (x1 - off_x), (y1 - off_y), w, h, FALSE);
  pixel_region_init (&destPR, GIMP_DRAWABLE(mask)->tiles, x1, y1, w, h, TRUE);
Elliot Lee's avatar
Elliot Lee committed
1146

1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
  switch (op)
  {
   case ADD: case REPLACE:
     pixel_regions_process_parallel ((p_func)channel_combine_sub_region_add,
				     NULL, 2, &srcPR, &destPR);
     break;
   case SUB:
     pixel_regions_process_parallel ((p_func)channel_combine_sub_region_sub,
				     NULL, 2, &srcPR, &destPR);
     break;
   case INTERSECT:
     pixel_regions_process_parallel ((p_func)
				     channel_combine_sub_region_intersect,
				     NULL, 2, &srcPR, &destPR);
     break;
   default:
     g_message("Error: unknown opperation type in channel_combine_mask\n");
     break;
  }
Elliot Lee's avatar
Elliot Lee committed
1166
1167
1168
1169
1170
  mask->bounds_known = FALSE;
}


void
1171
1172
1173
1174
1175
1176
1177
channel_feather (Channel *input,
		 Channel *output,
		 double   radius_x,
		 double   radius_y,
		 int      op,
		 int      off_x,
		 int      off_y)
Elliot Lee's avatar
Elliot Lee committed
1178
1179
1180
1181
{
  int x1, y1, x2, y2;
  PixelRegion srcPR;

1182
1183
1184
1185
  x1 = BOUNDS (off_x, 0, GIMP_DRAWABLE(output)->width);
  y1 = BOUNDS (off_y, 0, GIMP_DRAWABLE(output)->height);
  x2 = BOUNDS (off_x + GIMP_DRAWABLE(input)->width, 0, GIMP_DRAWABLE(output)->width);
  y2 = BOUNDS (off_y + GIMP_DRAWABLE(input)->height, 0, GIMP_DRAWABLE(output)->height);
Elliot Lee's avatar
Elliot Lee committed
1186

1187
  pixel_region_init (&srcPR, GIMP_DRAWABLE(input)->tiles, (x1 - off_x), (y1 - off_y), (x2 - x1), (y2 - y1), FALSE);
1188
  gaussian_blur_region (&srcPR, radius_x, radius_y);
Elliot Lee's avatar
Elliot Lee committed
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209

  if (input != output) 
    channel_combine_mask(output, input, op, 0, 0);

  output->bounds_known = FALSE;
}


void
channel_push_undo (Channel *mask)
{
  int x1, y1, x2, y2;
  MaskUndo *mask_undo;
  TileManager *undo_tiles;
  PixelRegion srcPR, destPR;
  GImage *gimage;

  mask_undo = (MaskUndo *) g_malloc (sizeof (MaskUndo));
  if (channel_bounds (mask, &x1, &y1, &x2, &y2))
    {
      undo_tiles = tile_manager_new ((x2 - x1), (y2 - y1), 1);
1210
      pixel_region_init (&srcPR, GIMP_DRAWABLE(mask)->tiles, x1, y1, (x2 - x1), (y2 - y1), FALSE);
Elliot Lee's avatar
Elliot Lee committed
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
      pixel_region_init (&destPR, undo_tiles, 0, 0, (x2 - x1), (y2 - y1), TRUE);
      copy_region (&srcPR, &destPR);
    }
  else
    undo_tiles = NULL;

  mask_undo->tiles = undo_tiles;
  mask_undo->x = x1;
  mask_undo->y = y1;

  /* push the undo buffer onto the undo stack */
1222
  gimage = GIMP_DRAWABLE(mask)->gimage;
Elliot Lee's avatar
Elliot Lee committed
1223
1224
1225
1226
  undo_push_mask (gimage, mask_undo);
  gimage_mask_invalidate (gimage);

  /*  invalidate the preview  */
1227
  GIMP_DRAWABLE(mask)->preview_valid = 0;
Elliot Lee's avatar
Elliot Lee committed
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
}


void
channel_clear (Channel *mask)
{
  PixelRegion maskPR;
  unsigned char bg = 0;

  /*  push the current channel onto the undo stack  */
  channel_push_undo (mask);

  if (mask->bounds_known && !mask->empty)
    {
1242
      pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, mask->x1, mask->y1,
Elliot Lee's avatar
Elliot Lee committed
1243
1244
1245
1246
1247
1248
			 (mask->x2 - mask->x1), (mask->y2 - mask->y1), TRUE);
      color_region (&maskPR, &bg);
    }
  else
    {
      /*  clear the mask  */
1249
      pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, TRUE);
Elliot Lee's avatar
Elliot Lee committed
1250
1251
1252
1253
1254
1255
1256
      color_region (&maskPR, &bg);
    }

  /*  we know the bounds  */
  mask->bounds_known = TRUE;
  mask->empty = TRUE;
  mask->x1 = 0; mask->y1 = 0;
1257
1258
  mask->x2 = GIMP_DRAWABLE(mask)->width;
  mask->y2 = GIMP_DRAWABLE(mask)->height;
Elliot Lee's avatar
Elliot Lee committed
1259
1260
1261
1262
1263
1264
1265
}


void
channel_invert (Channel *mask)
{
  PixelRegion maskPR;
1266
  GimpLut *lut;
Elliot Lee's avatar
Elliot Lee committed
1267
1268
1269
1270

  /*  push the current channel onto the undo stack  */
  channel_push_undo (mask);

1271
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, TRUE);
1272
1273
  
  lut = invert_lut_new(1);
Elliot Lee's avatar
Elliot Lee committed
1274

1275
1276
1277
  pixel_regions_process_parallel ((p_func)gimp_lut_process_inline,
				  lut, 1, &maskPR);
  gimp_lut_free(lut);
Elliot Lee's avatar
Elliot Lee committed
1278
1279
1280
1281
1282
1283
1284
  mask->bounds_known = FALSE;
}

void
channel_sharpen (Channel *mask)
{
  PixelRegion maskPR;
1285
  GimpLut *lut;
Elliot Lee's avatar
Elliot Lee committed
1286
1287
1288
  /*  push the current channel onto the undo stack  */
  channel_push_undo (mask);

1289
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, TRUE);
1290
  lut = threshold_lut_new(0.5, 1);
Elliot Lee's avatar
Elliot Lee committed
1291

1292
1293
1294
  pixel_regions_process_parallel ((p_func)gimp_lut_process_inline,
				  lut, 1, &maskPR);
  gimp_lut_free(lut);
Elliot Lee's avatar
Elliot Lee committed
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
}


void
channel_all (Channel *mask)
{
  PixelRegion maskPR;
  unsigned char bg = 255;

  /*  push the current channel onto the undo stack  */
  channel_push_undo (mask);

  /*  clear the mask  */
1308
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, TRUE);
Elliot Lee's avatar
Elliot Lee committed
1309
1310
1311
1312
1313
1314
  color_region (&maskPR, &bg);

  /*  we know the bounds  */
  mask->bounds_known = TRUE;
  mask->empty = FALSE;
  mask->x1 = 0; mask->y1 = 0;
1315
1316
  mask->x2 = GIMP_DRAWABLE(mask)->width;
  mask->y2 = GIMP_DRAWABLE(mask)->height;
Elliot Lee's avatar
Elliot Lee committed
1317
1318
1319
1320
}


void
1321
1322
1323
channel_border (Channel *mask,
		int      radius_x,
		int      radius_y)
Elliot Lee's avatar
Elliot Lee committed
1324
1325
1326
1327
{
  PixelRegion bPR;
  int x1, y1, x2, y2;

1328
  if (radius_x < 0 || radius_y < 0)
1329
    return;
1330

Elliot Lee's avatar
Elliot Lee committed
1331
1332
  if (! channel_bounds (mask, &x1, &y1, &x2, &y2))
    return;
1333
1334
1335
1336
  if (channel_is_empty (mask))
    return;

  if (x1 - radius_x < 0)
1337
1338
    x1 = 0;
  else
1339
1340
    x1 -= radius_x;
  if (x2 + radius_x > GIMP_DRAWABLE(mask)->width)
1341
1342
    x2 = GIMP_DRAWABLE(mask)->width;
  else
1343
    x2 += radius_x;
Elliot Lee's avatar
Elliot Lee committed
1344

1345
  if (y1 - radius_y < 0)
1346
1347
    y1 = 0;
  else
1348
1349
    y1 -= radius_y;
  if (y2 + radius_y > GIMP_DRAWABLE(mask)->height)
1350
1351
    y2 = GIMP_DRAWABLE(mask)->height;
  else
1352
    y2 += radius_y;
Elliot Lee's avatar
Elliot Lee committed
1353
1354
1355
  /*  push the current channel onto the undo stack  */
  channel_push_undo (mask);

1356
1357
  pixel_region_init (&bPR, GIMP_DRAWABLE(mask)->tiles, x1, y1,
		     (x2-x1), (y2-y1), TRUE);
Elliot Lee's avatar
Elliot Lee committed
1358

1359
  border_region(&bPR, radius_x, radius_y);
Elliot Lee's avatar
Elliot Lee committed
1360
1361
1362
1363
1364
1365

  mask->bounds_known = FALSE;
}


void
1366
1367
1368
channel_grow (Channel *mask,
	      int      radius_x,
	      int      radius_y)
Elliot Lee's avatar
Elliot Lee committed
1369
1370
{
  PixelRegion bPR;
1371
1372
  int x1, y1, x2, y2;

1373
  if (radius_x == 0 && radius_y == 0)
1374
1375
    return;

1376
1377
1378
1379
1380
1381
1382
1383
1384
  if (radius_x <= 0 && radius_y <= 0)
    {
      channel_shrink(mask, -radius_x, -radius_y, FALSE);
      return;
    }

  if (radius_x < 0 || radius_y < 0)
    return;
  
1385
1386
  if (! channel_bounds (mask, &x1, &y1, &x2, &y2))
    return;
Elliot Lee's avatar
Elliot Lee committed
1387
1388
1389
  if (channel_is_empty (mask))
    return;

1390
1391
  if (x1 - radius_x > 0)
    x1 = x1 - radius_x;
1392
1393
  else
    x1 = 0;
1394
1395
  if (y1 - radius_y > 0)
    y1 = y1 - radius_y;
1396
1397
  else
    y1 = 0;
1398
1399
  if (x2 + radius_x < GIMP_DRAWABLE(mask)->width)
    x2 = x2 + radius_x;
1400
1401
  else
    x2 = GIMP_DRAWABLE(mask)->width;
1402
1403
  if (y2 + radius_y < GIMP_DRAWABLE(mask)->height)
    y2 = y2 + radius_y;
1404
1405
1406
  else
    y2 = GIMP_DRAWABLE(mask)->height;

Elliot Lee's avatar
Elliot Lee committed
1407
1408
1409
  /*  push the current channel onto the undo stack  */
  channel_push_undo (mask);

1410
1411
1412
  /*  need full extents for grow, not! */
  pixel_region_init (&bPR, GIMP_DRAWABLE(mask)->tiles, x1, y1, (x2 - x1),
		     (y2 - y1), TRUE);
Elliot Lee's avatar
Elliot Lee committed
1413

1414
1415
  fatten_region (&bPR, radius_x, radius_y);

Elliot Lee's avatar
Elliot Lee committed
1416
1417
1418
1419
1420
  mask->bounds_known = FALSE;
}


void
1421
1422
1423
1424
channel_shrink (Channel *mask,
		int      radius_x,
		int      radius_y,
		int      edge_lock)
Elliot Lee's avatar
Elliot Lee committed
1425
1426
1427
1428
{
  PixelRegion bPR;
  int x1, y1, x2, y2;

1429
  if (radius_x == 0 && radius_y == 0)
1430
    return;
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440

  if (radius_x <= 0 && radius_y <= 0)
    {
      channel_grow (mask, -radius_x, -radius_y);
      return;
    }

  if (radius_x < 0 || radius_y < 0)
    return;
  
Elliot Lee's avatar
Elliot Lee committed
1441
1442
  if (! channel_bounds (mask, &x1, &y1, &x2, &y2))
    return;
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
  if (channel_is_empty (mask))
    return;

  if (x1 > 0)
    x1--;
  if (y1 > 0)
    y1--;
  if (x2 < GIMP_DRAWABLE(mask)->width)
    x2++;
  if (y2 < GIMP_DRAWABLE(mask)->height)
    y2++;
1454
1455
1456
1457

  /*  push the current channel onto the undo stack  */
  channel_push_undo (mask);

1458
1459
  pixel_region_init (&bPR, GIMP_DRAWABLE(mask)->tiles, x1, y1, (x2 - x1),
		     (y2 - y1), TRUE);
Elliot Lee's avatar
Elliot Lee committed
1460

1461
  thin_region (&bPR, radius_x, radius_y, edge_lock);
Elliot Lee's avatar
Elliot Lee committed
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481

  mask->bounds_known = FALSE;
}


void
channel_translate (Channel *mask, int off_x, int off_y)
{
  int width, height;
  Channel *tmp_mask;
  PixelRegion srcPR, destPR;
  unsigned char empty = 0;
  int x1, y1, x2, y2;

  tmp_mask = NULL;

  /*  push the current channel onto the undo stack  */
  channel_push_undo (mask);

  channel_bounds (mask, &x1, &y1, &x2, &y2);
1482
1483
1484
1485
  x1 = BOUNDS ((x1 + off_x), 0, GIMP_DRAWABLE(mask)->width);
  y1 = BOUNDS ((y1 + off_y), 0, GIMP_DRAWABLE(mask)->height);
  x2 = BOUNDS ((x2 + off_x), 0, GIMP_DRAWABLE(mask)->width);
  y2 = BOUNDS ((y2 + off_y), 0, GIMP_DRAWABLE(mask)->height);
Elliot Lee's avatar
Elliot Lee committed
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495

  width = x2 - x1;
  height = y2 - y1;

  /*  make sure width and height are non-zero  */
  if (width != 0 && height != 0)
    {
      /*  copy the portion of the mask we will keep to a
       *  temporary buffer
       */
1496
      tmp_mask = channel_new_mask (GIMP_DRAWABLE(mask)->gimage, width, height);
Elliot Lee's avatar
Elliot Lee committed
1497

1498
1499
      pixel_region_init (&srcPR, GIMP_DRAWABLE(mask)->tiles, x1 - off_x, y1 - off_y, width, height, FALSE);
      pixel_region_init (&destPR, GIMP_DRAWABLE(tmp_mask)->tiles, 0, 0, width, height, TRUE);
Elliot Lee's avatar
Elliot Lee committed
1500
1501
1502
1503
      copy_region (&srcPR, &destPR);
    }

  /*  clear the mask  */