gimpchannel.c 34.3 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 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
/* 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
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#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"
#include "temp_buf.h"
#include "undo.h"

33 34
#include "channel_pvt.h"

scott's avatar
scott committed
35
/*
36 37 38
enum {
  LAST_SIGNAL
};
scott's avatar
scott committed
39
*/
40 41 42 43 44

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
45
/*
46
static gint channel_signals[LAST_SIGNAL] = { 0 };
scott's avatar
scott committed
47
*/
48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

static GimpDrawableClass *parent_class = NULL;

guint
gimp_channel_get_type ()
{
  static guint channel_type = 0;

  if (!channel_type)
    {
      GtkTypeInfo channel_info =
      {
	"GimpChannel",
	sizeof (GimpChannel),
	sizeof (GimpChannelClass),
	(GtkClassInitFunc) gimp_channel_class_init,
	(GtkObjectInitFunc) gimp_channel_init,
65 66
	(GtkArgSetFunc) NULL,
	(GtkArgGetFunc) NULL,
67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82
      };

      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
83
  /*
84
  gtk_object_class_add_signals (object_class, channel_signals, LAST_SIGNAL);
scott's avatar
scott committed
85
  */
86 87 88 89 90 91 92 93

  object_class->destroy = gimp_channel_destroy;
}

static void
gimp_channel_init (GimpChannel *channel)
{
}
Elliot Lee's avatar
Elliot Lee committed
94 95 96 97 98 99 100 101

#define ROUND(x) ((int) (x + 0.5))

/*
 *  Static variables
 */
extern int global_drawable_ID;

102
int channel_get_count = 0;
Elliot Lee's avatar
Elliot Lee committed
103 104 105 106 107 108 109 110 111


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

static void
channel_validate (TileManager *tm, Tile *tile, int level)
{
  /*  Set the contents of the tile to empty  */
Manish Singh's avatar
Manish Singh committed
112
  memset (tile->data, TRANSPARENT_OPACITY, tile->ewidth * tile->eheight);
Elliot Lee's avatar
Elliot Lee committed
113 114 115 116 117 118 119 120 121 122 123 124
}




Channel *
channel_new (int gimage_ID, int width, int height, char *name, int opacity,
	     unsigned char *col)
{
  Channel * channel;
  int i;

125
  channel = gtk_type_new (gimp_channel_get_type ());
Elliot Lee's avatar
Elliot Lee committed
126

127 128
  gimp_drawable_configure (GIMP_DRAWABLE(channel), 
			   gimage_ID, width, height, GRAY_GIMAGE, name);
Elliot Lee's avatar
Elliot Lee committed
129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150

  /*  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
151 152 153 154 155 156 157 158 159 160 161 162 163 164 165
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
166 167 168 169 170 171 172 173 174

Channel *
channel_copy (Channel *channel)
{
  char * channel_name;
  Channel * new_channel;
  PixelRegion srcPR, destPR;

  /*  formulate the new channel name  */
175 176
  channel_name = (char *) g_malloc (strlen (GIMP_DRAWABLE(channel)->name) + 6);
  sprintf (channel_name, "%s copy", GIMP_DRAWABLE(channel)->name);
Elliot Lee's avatar
Elliot Lee committed
177 178

  /*  allocate a new channel object  */
179 180 181 182 183
  new_channel = channel_new (GIMP_DRAWABLE(channel)->gimage_ID, 
			     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
184 185 186
  new_channel->show_masked = channel->show_masked;

  /*  copy the contents across channels  */
187 188 189 190
  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
191 192 193 194 195 196 197 198 199 200 201 202
  copy_region (&srcPR, &destPR);

  /*  free up the channel_name memory  */
  g_free (channel_name);

  return new_channel;
}


Channel *
channel_get_ID (int ID)
{
203 204 205 206 207 208
  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
209 210 211 212 213 214
}


void
channel_delete (Channel *channel)
{
scott's avatar
scott committed
215
  gtk_object_unref (GTK_OBJECT (channel));
216 217 218 219 220 221 222 223 224 225 226 227
}

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
228 229 230 231 232 233
  /* free the segments?  */
  if (channel->segs_in)
    g_free (channel->segs_in);
  if (channel->segs_out)
    g_free (channel->segs_out);

234 235 236
  if (GTK_OBJECT_CLASS (parent_class)->destroy)
    (*GTK_OBJECT_CLASS (parent_class)->destroy) (object);
  
Elliot Lee's avatar
Elliot Lee committed
237 238 239 240 241 242 243 244 245 246 247 248
}

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  */
249
  drawable_update (GIMP_DRAWABLE(channel), 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height);
Elliot Lee's avatar
Elliot Lee committed
250 251

  /*  Configure the pixel regions  */
252
  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
253 254 255 256 257 258 259 260 261

  /*  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  */
262
  undo_push_channel_mod (gimage_get_ID (GIMP_DRAWABLE(channel)->gimage_ID), channel);
Elliot Lee's avatar
Elliot Lee committed
263 264

  /*  Configure the new channel  */
265 266 267
  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
268 269 270 271 272

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

  /*  Update the new channel position  */
273
  drawable_update (GIMP_DRAWABLE(channel), 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height);
Elliot Lee's avatar
Elliot Lee committed
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292
}


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);
293 294
  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
295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320
  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  */
321
  drawable_update (GIMP_DRAWABLE(channel), 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height);
Elliot Lee's avatar
Elliot Lee committed
322 323

  /*  Configure the pixel regions  */
324
  pixel_region_init (&srcPR, GIMP_DRAWABLE(channel)->tiles, x1, y1, w, h, FALSE);
Elliot Lee's avatar
Elliot Lee committed
325 326

  /*  Determine whether the new channel needs to be initially cleared  */
327 328
  if ((new_width > GIMP_DRAWABLE(channel)->width) ||
      (new_height > GIMP_DRAWABLE(channel)->height) ||
Elliot Lee's avatar
Elliot Lee committed
329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349
      (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  */
350
  undo_push_channel_mod (gimage_get_ID (GIMP_DRAWABLE(channel)->gimage_ID), channel);
Elliot Lee's avatar
Elliot Lee committed
351 352

  /*  Configure the new channel  */
353 354 355
  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
356 357 358 359 360

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

  /*  update the new channel area  */
361
  drawable_update (GIMP_DRAWABLE(channel), 0, 0, GIMP_DRAWABLE(channel)->width, GIMP_DRAWABLE(channel)->height);
Elliot Lee's avatar
Elliot Lee committed
362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377
}


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

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


int
channel_toggle_visibility (Channel *channel)
{
378
  GIMP_DRAWABLE(channel)->visible = !GIMP_DRAWABLE(channel)->visible;
Elliot Lee's avatar
Elliot Lee committed
379

380
  return GIMP_DRAWABLE(channel)->visible;
Elliot Lee's avatar
Elliot Lee committed
381 382 383 384 385 386 387 388 389 390 391
}


TempBuf *
channel_preview (Channel *channel, int width, int height)
{
  MaskBuf * preview_buf;
  PixelRegion srcPR, destPR;
  int subsample;

  /*  The easy way  */
392 393 394 395
  if (GIMP_DRAWABLE(channel)->preview_valid &&
      GIMP_DRAWABLE(channel)->preview->width == width &&
      GIMP_DRAWABLE(channel)->preview->height == height)
    return GIMP_DRAWABLE(channel)->preview;
Elliot Lee's avatar
Elliot Lee committed
396 397 398 399 400
  /*  The hard way  */
  else
    {
      /*  calculate 'acceptable' subsample  */
      subsample = 1;
401 402
      if (width < 1) width = 1;
      if (height < 1) height = 1;
403 404
      while ((width * (subsample + 1) * 2 < GIMP_DRAWABLE(channel)->width) &&
	     (height * (subsample + 1) * 2 < GIMP_DRAWABLE(channel)->height))
Elliot Lee's avatar
Elliot Lee committed
405 406
	subsample = subsample + 1;

407
      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
408 409 410 411 412 413 414 415 416 417 418 419

      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);

420 421
      if (GIMP_DRAWABLE(channel)->preview_valid)
	mask_buf_free (GIMP_DRAWABLE(channel)->preview);
Elliot Lee's avatar
Elliot Lee committed
422

423 424
      GIMP_DRAWABLE(channel)->preview = preview_buf;
      GIMP_DRAWABLE(channel)->preview_valid = 1;
Elliot Lee's avatar
Elliot Lee committed
425

426
      return GIMP_DRAWABLE(channel)->preview;
Elliot Lee's avatar
Elliot Lee committed
427 428 429 430 431 432 433
    }
}


void
channel_invalidate_previews (int gimage_id)
{
434
  GSList * tmp;
Elliot Lee's avatar
Elliot Lee committed
435
  Channel * channel;
436 437 438 439 440 441
  GImage * gimage;

  if (! (gimage = gimage_get_ID (gimage_id)))
    return;

  tmp = gimage->channels;
Elliot Lee's avatar
Elliot Lee committed
442 443 444 445

  while (tmp)
    {
      channel = (Channel *) tmp->data;
446
      drawable_invalidate_preview (GIMP_DRAWABLE(channel));
447
      tmp = g_slist_next (tmp);
Elliot Lee's avatar
Elliot Lee committed
448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
    }
}


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


Channel *
channel_new_mask (int gimage_ID, int width, int height)
{
  unsigned char black[3] = {0, 0, 0};
  Channel *new_channel;

  /*  Create the new channel  */
  new_channel = channel_new (gimage_ID, width, height, "Selection Mask", 127, black);

  /*  Set the validate procedure  */
466
  tile_manager_set_validate_proc (GIMP_DRAWABLE(new_channel)->tiles, channel_validate);
Elliot Lee's avatar
Elliot Lee committed
467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489

  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))
	{
490
	  pixel_region_init (&bPR, GIMP_DRAWABLE(mask)->tiles, x3, y3, (x4 - x3), (y4 - y3), FALSE);
Elliot Lee's avatar
Elliot Lee committed
491 492 493 494 495 496 497 498 499 500 501
	  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)
	    {
502
	      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
503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548
	      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
    {
549
      if (x < 0 || x >= GIMP_DRAWABLE(mask)->width || y < 0 || y >= GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
550 551 552
	return 0;
    }

553
  tile = tile_manager_get_tile (GIMP_DRAWABLE(mask)->tiles, x, y, 0);
Elliot Lee's avatar
Elliot Lee committed
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583
  tile_ref (tile);
  val = tile->data[(y % TILE_HEIGHT) * TILE_WIDTH + (x % TILE_WIDTH)];
  tile_unref (tile, FALSE);

  return val;
}


int
channel_bounds (Channel *mask, int *x1, int *y1, int *x2, int *y2)
{
  PixelRegion maskPR;
  unsigned char * data;
  int x, y;
  int ex, ey;
  int found;
  void *pr;

  /*  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  */
584 585
  *x1 = GIMP_DRAWABLE(mask)->width;
  *y1 = GIMP_DRAWABLE(mask)->height;
Elliot Lee's avatar
Elliot Lee committed
586 587 588
  *x2 = 0;
  *y2 = 0;

589
  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
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
  for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
    {
      data = maskPR.data;
      ex = maskPR.x + maskPR.w;
      ey = maskPR.y + maskPR.h;

      for (y = maskPR.y; y < ey; y++)
	{
	  found = FALSE;
	  for (x = maskPR.x; x < ex; x++, data++)
	    if (*data)
	      {
		if (x < *x1)
		  *x1 = x;
		if (x > *x2)
		  *x2 = x;
		found = TRUE;
	      }
	  if (found)
	    {
	      if (y < *y1)
		*y1 = y;
	      if (y > *y2)
		*y2 = y;
	    }
	}
    }

618 619
  *x2 = BOUNDS (*x2 + 1, 0, GIMP_DRAWABLE(mask)->width);
  *y2 = BOUNDS (*y2 + 1, 0, GIMP_DRAWABLE(mask)->height);
Elliot Lee's avatar
Elliot Lee committed
620

621
  if (*x1 == GIMP_DRAWABLE(mask)->width && *y1 == GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
622 623 624
    {
      mask->empty = TRUE;
      mask->x1 = 0; mask->y1 = 0;
625 626
      mask->x2 = GIMP_DRAWABLE(mask)->width;
      mask->y2 = GIMP_DRAWABLE(mask)->height;
Elliot Lee's avatar
Elliot Lee committed
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
    }
  else
    {
      mask->empty = FALSE;
      mask->x1 = *x1;
      mask->y1 = *y1;
      mask->x2 = *x2;
      mask->y2 = *y2;
    }
  mask->bounds_known = TRUE;

  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;

653
  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
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680
  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;
681 682
  mask->x2 = GIMP_DRAWABLE(mask)->width;
  mask->y2 = GIMP_DRAWABLE(mask)->height;
Elliot Lee's avatar
Elliot Lee committed
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699

  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;
700
  if (x2 > GIMP_DRAWABLE(mask)->width) x2 = GIMP_DRAWABLE(mask)->width;
Elliot Lee's avatar
Elliot Lee committed
701
  if (x < 0) x = 0;
702
  if (x > GIMP_DRAWABLE(mask)->width) x = GIMP_DRAWABLE(mask)->width;
Elliot Lee's avatar
Elliot Lee committed
703 704 705
  width = x2 - x;
  if (!width) return;

706
  if (y < 0 || y > GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
707 708
    return;

709
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, x, y, width, 1, TRUE);
Elliot Lee's avatar
Elliot Lee committed
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736
  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;
737
  if (x2 > GIMP_DRAWABLE(mask)->width) x2 = GIMP_DRAWABLE(mask)->width;
Elliot Lee's avatar
Elliot Lee committed
738
  if (x < 0) x = 0;
739
  if (x > GIMP_DRAWABLE(mask)->width) x = GIMP_DRAWABLE(mask)->width;
Elliot Lee's avatar
Elliot Lee committed
740 741 742
  width = x2 - x;
  if (!width) return;

743
  if (y < 0 || y > GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
744 745
    return;

746
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, x, y, width, 1, TRUE);
Elliot Lee's avatar
Elliot Lee committed
747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
  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
channel_inter_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;
774
  if (x2 > GIMP_DRAWABLE(mask)->width) x2 = GIMP_DRAWABLE(mask)->width;
Elliot Lee's avatar
Elliot Lee committed
775
  if (x < 0) x = 0;
776
  if (x > GIMP_DRAWABLE(mask)->width) x = GIMP_DRAWABLE(mask)->width;
Elliot Lee's avatar
Elliot Lee committed
777 778 779
  width = x2 - x;
  if (!width) return;

780
  if (y < 0 || y > GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
781 782
    return;

783
  pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, x, y, width, 1, TRUE);
Elliot Lee's avatar
Elliot Lee committed
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802
  for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
    {
      data = maskPR.data;
      width = maskPR.w;
      while (width--)
	{
	  val = MINIMUM(*data, value);
	  *data++ = val;
	}
    }
}

void
channel_combine_rect (Channel *mask, int op, int x, int y, int w, int h)
{
  int i;

  for (i = y; i < y + h; i++)
    {
803
      if (i >= 0 && i < GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840
	switch (op)
	  {
	  case ADD: case REPLACE:
	    channel_add_segment (mask, x, i, w, 255);
	    break;
	  case SUB:
	    channel_sub_segment (mask, x, i, w, 255);
	    break;
	  case INTERSECT:
	    channel_inter_segment (mask, x, i, w, 255);
	    break;
	  }
    }

  /*  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;

841 842 843 844
  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
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
}


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++)
    {
877
      if (i >= 0 && i < GIMP_DRAWABLE(mask)->height)
Elliot Lee's avatar
Elliot Lee committed
878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986
	{
	  /*  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;
		case INTERSECT:
		  channel_inter_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;

		  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;
			case INTERSECT:
			  channel_inter_segment (mask, x0, i, j - x0, last);
			}
		    }

		  if (last != val)
		    {
		      x0 = j;
		      last = val;
		    }
		}

	      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);
		  else if (op == INTERSECT)
		    channel_inter_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;

987 988 989 990
  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
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006
}


void
channel_combine_mask (Channel *mask, Channel *add_on, int op,
		      int off_x, int off_y)
{
  PixelRegion srcPR, destPR;
  unsigned char *src;
  unsigned char *dest;
  int val;
  int x1, y1, x2, y2;
  int x, y;
  int w, h;
  void * pr;

1007 1008 1009 1010
  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
1011 1012 1013 1014

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

1015 1016
  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
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 1053 1054 1055 1056 1057 1058 1059 1060 1061

  for (pr = pixel_regions_register (2, &srcPR, &destPR); pr != NULL; pr = pixel_regions_process (pr))
    {
      src = srcPR.data;
      dest = destPR.data;

      for (y = 0; y < srcPR.h; y++)
	{
	  for (x = 0; x < srcPR.w; x++)
	    {
	      switch (op)
		{
		case ADD: case REPLACE:
		  val = dest[x] + src[x];
		  if (val > 255) val = 255;
		  break;
		case SUB:
		  val = dest[x] - src[x];
		  if (val < 0) val = 0;
		  break;
		case INTERSECT:
		  val = MINIMUM(dest[x], src[x]);
		  break;
		default:
		  val = 0;
		  break;
		}
	      dest[x] = val;
	    }
	  src += srcPR.rowstride;
	  dest += destPR.rowstride;
	}
    }

  mask->bounds_known = FALSE;
}


void
channel_feather (Channel *input, Channel *output, double radius,
		 int op, int off_x, int off_y)
{
  int x1, y1, x2, y2;
  PixelRegion srcPR;

1062 1063 1064 1065
  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
1066

1067
  pixel_region_init (&srcPR, GIMP_DRAWABLE(input)->tiles, (x1 - off_x), (y1 - off_y), (x2 - x1), (y2 - y1), FALSE);
Elliot Lee's avatar
Elliot Lee committed
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
  gaussian_blur_region (&srcPR, radius);

  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);
1090
      pixel_region_init (&srcPR, GIMP_DRAWABLE(mask)->tiles, x1, y1, (x2 - x1), (y2 - y1), FALSE);
Elliot Lee's avatar
Elliot Lee committed
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101
      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 */
1102
  gimage = gimage_get_ID (GIMP_DRAWABLE(mask)->gimage_ID);
Elliot Lee's avatar
Elliot Lee committed
1103 1104 1105 1106
  undo_push_mask (gimage, mask_undo);
  gimage_mask_invalidate (gimage);

  /*  invalidate the preview  */
1107
  GIMP_DRAWABLE(mask)->preview_valid = 0;
Elliot Lee's avatar
Elliot Lee committed
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121
}


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)
    {
1122
      pixel_region_init (&maskPR, GIMP_DRAWABLE(mask)->tiles, mask->x1, mask->y1,
Elliot Lee's avatar
Elliot Lee committed
1123 1124 1125 1126 1127 1128
			 (mask->x2 - mask->x1), (mask->y2 - mask->y1), TRUE);
      color_region (&maskPR, &bg);
    }
  else
    {
      /*  clear the mask  */
1129
      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
1130 1131 1132 1133 1134 1135 1136
      color_region (&maskPR, &bg);
    }

  /*  we know the bounds  */
  mask->bounds_known = TRUE;
  mask->empty = TRUE;
  mask->x1 = 0; mask->y1 = 0;
1137 1138
  mask->x2 = GIMP_DRAWABLE(mask)->width;
  mask->y2 = GIMP_DRAWABLE(mask)->height;
Elliot Lee's avatar
Elliot Lee committed
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
}


void
channel_invert (Channel *mask)
{
  PixelRegion maskPR;
  unsigned char *data;
  int size;
  void * pr;

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

1153
  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
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
  for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
    {
      /*  subtract each pixel in the mask from 255  */
      data = maskPR.data;
      size = maskPR.w * maskPR.h;
      while (size --)
	{
	  *data = 255 - *data;
	  data++;
	}
    }

  mask->bounds_known = FALSE;
}


void
channel_sharpen (Channel *mask)
{
  PixelRegion maskPR;
  unsigned char *data;
  int size;
  void * pr;

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

1181
  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
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
  for (pr = pixel_regions_register (1, &maskPR); pr != NULL; pr = pixel_regions_process (pr))
    {
      /*  if a pixel in the mask has a non-zero value, make it 255  */
      data = maskPR.data;
      size = maskPR.w * maskPR.h;
      while (size--)
	{
	  if (*data > HALF_WAY)
	    *data++ = 255;
	  else
	    *data++ = 0;
	}
    }

  mask->bounds_known = FALSE;
}


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  */
1210
  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
1211 1212 1213 1214 1215 1216
  color_region (&maskPR, &bg);

  /*  we know the bounds  */
  mask->bounds_known = TRUE;
  mask->empty = FALSE;
  mask->x1 = 0; mask->y1 = 0;
1217 1218
  mask->x2 = GIMP_DRAWABLE(mask)->width;
  mask->y2 = GIMP_DRAWABLE(mask)->height;
Elliot Lee's avatar
Elliot Lee committed
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
}


void
channel_border (Channel *mask, int radius)
{
  PixelRegion bPR;
  int x1, y1, x2, y2;
  BoundSeg * bs;
  unsigned char bg = 0;
  int num_segs;

  if (! channel_bounds (mask, &x1, &y1, &x2, &y2))
    return;

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

1237
  pixel_region_init (&bPR, GIMP_DRAWABLE(mask)->tiles, x1, y1, (x2 - x1), (y2 - y1), FALSE);
Elliot Lee's avatar
Elliot Lee committed
1238 1239 1240 1241 1242
  bs =  find_mask_boundary (&bPR, &num_segs, WithinBounds, x1, y1, x2, y2);

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

  /*  calculate a border of specified radius based on the boundary segments  */
1255
  pixel_region_init (&bPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, TRUE);
Elliot Lee's avatar
Elliot Lee committed
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275
  border_region (&bPR, bs, num_segs, radius);

  g_free (bs);

  mask->bounds_known = FALSE;
}


void
channel_grow (Channel *mask, int steps)
{
  PixelRegion bPR;

  if (channel_is_empty (mask))
    return;

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

  /*  need full extents for grow  */
1276
  pixel_region_init (&bPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, TRUE);
Elliot Lee's avatar
Elliot Lee committed
1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296

  while (steps--)
    thin_region (&bPR, GROW_REGION);

  mask->bounds_known = FALSE;
}


void
channel_shrink (Channel *mask, int steps)
{
  PixelRegion bPR;
  int x1, y1, x2, y2;

  if (! channel_bounds (mask, &x1, &y1, &x2, &y2))
    return;

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

1297
  pixel_region_init (&bPR, GIMP_DRAWABLE(mask)->tiles, x1, y1, (x2 - x1), (y2 - y1), TRUE);
Elliot Lee's avatar
Elliot Lee committed
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320

  while (steps--)
    thin_region (&bPR, SHRINK_REGION);

  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);
1321 1322 1323 1324
  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
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334

  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
       */
1335
      tmp_mask = channel_new_mask (GIMP_DRAWABLE(mask)->gimage_ID, width, height);
Elliot Lee's avatar
Elliot Lee committed
1336

1337 1338
      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
1339 1340 1341 1342
      copy_region (&srcPR, &destPR);
    }

  /*  clear the mask  */
1343
  pixel_region_init (&srcPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, TRUE);
Elliot Lee's avatar
Elliot Lee committed
1344 1345 1346 1347 1348
  color_region (&srcPR, &empty);

  if (width != 0 && height != 0)
    {
      /*  copy the temp mask back to the mask  */
1349 1350
      pixel_region_init (&srcPR, GIMP_DRAWABLE(tmp_mask)->tiles, 0, 0, width, height, FALSE);
      pixel_region_init (&destPR, GIMP_DRAWABLE(mask)->tiles, x1, y1, width, height, TRUE);
Elliot Lee's avatar
Elliot Lee committed
1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
      copy_region (&srcPR, &destPR);

      /*  free the temporary mask  */
      channel_delete (tmp_mask);
    }

  /*  calculate new bounds  */
  if (width == 0 || height == 0)
    {
      mask->empty = TRUE;
      mask->x1 = 0; mask->y1 = 0;
1362 1363
      mask->x2 = GIMP_DRAWABLE(mask)->width;
      mask->y2 = GIMP_DRAWABLE(mask)->height;
Elliot Lee's avatar
Elliot Lee committed
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
    }
  else
    {
      mask->x1 = x1;
      mask->y1 = y1;
      mask->x2 = x2;
      mask->y2 = y2;
    }
}


void
1376
channel_layer_alpha (Channel *mask, Layer *layer)
Elliot Lee's avatar
Elliot Lee committed
1377 1378 1379 1380 1381 1382 1383 1384 1385
{
  PixelRegion srcPR, destPR;
  unsigned char empty = 0;
  int x1, y1, x2, y2;

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

  /*  clear the mask  */
1386
  pixel_region_init (&destPR, GIMP_DRAWABLE(mask)->tiles, 0, 0, GIMP_DRAWABLE(mask)->width, GIMP_DRAWABLE(mask)->height, TRUE);
Elliot Lee's avatar
Elliot Lee committed
1387 1388
  color_region (&destPR, &empty);

1389 1390 1391 1392
  x1 = BOUNDS (GIMP_DRAWABLE(layer)->offset_x, 0, GIMP_DRAWABLE(mask)->width);
  y1 = BOUNDS (GIMP_DRAWABLE(layer)->offset_y, 0, GIMP_DRAWABLE(mask)->height);
  x2 = BOUNDS (GIMP_DRAWABLE(layer)->offset_x + GIMP_DRAWABLE(layer)->width, 0, GIMP_DRAWABLE(mask)->width);
  y2 = BOUNDS (GIMP_DRAWABLE(layer)->offset_y + GIMP_DRAWABLE(layer)->height, 0, GIMP_DRAWABLE(mask)->height);
Elliot Lee's avatar
Elliot Lee committed
1393

1394 1395
  pixel_region_init (&srcPR, GIMP_DRAWABLE(layer)->tiles,
		     (x1 - GIMP_DRAWABLE(layer)->offset_x), (y1 - GIMP_DRAWABLE(layer)->offset_y),
Elliot Lee's avatar
Elliot Lee committed
1396
		     (x2 - x1), (y2 - y1), FALSE);
1397
  pixel_region_init (&destPR, GIMP_DRAWABLE(mask)->tiles, x1, y1, (x2 - x1), (y2 - y1), TRUE);