gimpchannel.c 42.3 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
/* 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
#include "config.h"

Elliot Lee's avatar
Elliot Lee committed
21 22
#include <stdlib.h>
#include <string.h>
23

Sven Neumann's avatar
Sven Neumann committed
24 25
#include <gtk/gtk.h>

26 27
#include "libgimpmath/gimpmath.h"

Sven Neumann's avatar
Sven Neumann committed
28 29
#include "apptypes.h"

Elliot Lee's avatar
Elliot Lee committed
30
#include "appenv.h"
31
#include "boundary.h"
Elliot Lee's avatar
Elliot Lee committed
32 33
#include "channel.h"
#include "drawable.h"
34
#include "gdisplay.h"
35
#include "gimpimage.h"
Elliot Lee's avatar
Elliot Lee committed
36
#include "gimage_mask.h"
37 38
#include "gimppreviewcache.h"
#include "gimplut.h"
Elliot Lee's avatar
Elliot Lee committed
39 40
#include "layer.h"
#include "paint_funcs.h"
41
#include "parasitelist.h"
42 43 44
#include "pixel_processor.h"
#include "pixel_region.h"
#include "lut_funcs.h"
Elliot Lee's avatar
Elliot Lee committed
45
#include "temp_buf.h"
scott's avatar
scott committed
46
#include "tile.h"
47 48
#include "tile_manager.h"
#include "undo.h"
49

50 51 52
#include "libgimp/gimpintl.h"


Michael Natterer's avatar
Michael Natterer committed
53 54 55
static void      gimp_channel_class_init      (GimpChannelClass *klass);
static void      gimp_channel_init            (GimpChannel      *channel);
static void      gimp_channel_destroy         (GtkObject        *object);
56

Michael Natterer's avatar
Michael Natterer committed
57 58 59
static TempBuf * gimp_channel_preview_private (GimpChannel *channel,
					       gint         width,
					       gint         height);
60

61 62 63

static GimpDrawableClass *parent_class = NULL;

64

65
GtkType
66
gimp_channel_get_type (void)
67
{
68
  static GtkType channel_type = 0;
69 70 71 72 73 74 75 76 77 78

  if (!channel_type)
    {
      GtkTypeInfo channel_info =
      {
	"GimpChannel",
	sizeof (GimpChannel),
	sizeof (GimpChannelClass),
	(GtkClassInitFunc) gimp_channel_class_init,
	(GtkObjectInitFunc) gimp_channel_init,
79 80
        /* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
81
	(GtkClassInitFunc) NULL,
82 83
      };

84
      channel_type = gtk_type_unique (GIMP_TYPE_DRAWABLE, &channel_info);
85 86 87 88 89 90
    }

  return channel_type;
}

static void
91
gimp_channel_class_init (GimpChannelClass *klass)
92 93 94
{
  GtkObjectClass *object_class;

95 96 97
  object_class = (GtkObjectClass *) klass;

  parent_class = gtk_type_class (GIMP_TYPE_DRAWABLE);
98 99 100 101 102 103 104 105

  object_class->destroy = gimp_channel_destroy;
}

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

/**************************/
/*  Function definitions  */
109
/**************************/
Elliot Lee's avatar
Elliot Lee committed
110 111

static void
Michael Natterer's avatar
Michael Natterer committed
112 113
gimp_channel_validate (TileManager *tm,
		       Tile        *tile)
Elliot Lee's avatar
Elliot Lee committed
114 115
{
  /*  Set the contents of the tile to empty  */
scott's avatar
scott committed
116
  memset (tile_data_pointer (tile, 0, 0), 
117
	  TRANSPARENT_OPACITY, tile_size (tile));
Elliot Lee's avatar
Elliot Lee committed
118 119
}

Michael Natterer's avatar
Michael Natterer committed
120 121 122 123 124 125
GimpChannel *
gimp_channel_new (GimpImage     *gimage,
		  gint           width,
		  gint           height,
		  const gchar   *name,
		  const GimpRGB *color)
Elliot Lee's avatar
Elliot Lee committed
126
{
Michael Natterer's avatar
Michael Natterer committed
127
  GimpChannel *channel;
128 129

  g_return_val_if_fail (color != NULL, NULL);
Elliot Lee's avatar
Elliot Lee committed
130

131
  channel = gtk_type_new (GIMP_TYPE_CHANNEL);
Elliot Lee's avatar
Elliot Lee committed
132

Michael Natterer's avatar
Michael Natterer committed
133
  gimp_drawable_configure (GIMP_DRAWABLE (channel),
134
			   gimage, width, height, GRAY_GIMAGE, name);
Elliot Lee's avatar
Elliot Lee committed
135 136

  /*  set the channel color and opacity  */
137
  channel->color = *color;
138 139

  channel->show_masked = TRUE;
Elliot Lee's avatar
Elliot Lee committed
140 141

  /*  selection mask variables  */
142 143 144 145 146 147
  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;
Elliot Lee's avatar
Elliot Lee committed
148
  channel->boundary_known = TRUE;
149 150 151 152
  channel->x1             = 0;
  channel->y1             = 0;
  channel->x2             = width;
  channel->y2             = height;
Elliot Lee's avatar
Elliot Lee committed
153 154 155 156

  return channel;
}

Michael Natterer's avatar
Michael Natterer committed
157 158
GimpChannel *
gimp_channel_copy (const GimpChannel *channel)
Elliot Lee's avatar
Elliot Lee committed
159
{
160
  gchar       *channel_name;
Michael Natterer's avatar
Michael Natterer committed
161
  GimpChannel *new_channel;
162 163 164 165 166
  PixelRegion  srcPR, destPR;
  gchar       *ext;
  gint         number;
  const gchar *name;
  gint         len;
Elliot Lee's avatar
Elliot Lee committed
167 168

  /*  formulate the new channel name  */
169 170
  name = gimp_object_get_name (GIMP_OBJECT (channel));

171
  ext = strrchr (name, '#');
172
  len = strlen (_("copy"));
173 174 175 176
  if ((strlen (name) >= len &&
       strcmp (&name[strlen (name) - len], _("copy")) == 0) ||
      (ext && (number = atoi (ext + 1)) > 0 && 
       ((int)(log10 (number) + 1)) == strlen (ext + 1)))
177 178
    /* don't have redundant "copy"s */
    channel_name = g_strdup (name);
179
  else
180
    channel_name = g_strdup_printf (_("%s copy"), name);
Elliot Lee's avatar
Elliot Lee committed
181 182

  /*  allocate a new channel object  */
Michael Natterer's avatar
Michael Natterer committed
183 184 185 186 187
  new_channel = gimp_channel_new (GIMP_DRAWABLE (channel)->gimage, 
				  GIMP_DRAWABLE (channel)->width, 
				  GIMP_DRAWABLE (channel)->height, 
				  channel_name,
				  &channel->color);
188
  GIMP_DRAWABLE (new_channel)->visible = GIMP_DRAWABLE (channel)->visible;
Elliot Lee's avatar
Elliot Lee committed
189 190 191
  new_channel->show_masked = channel->show_masked;

  /*  copy the contents across channels  */
192 193 194 195 196 197 198
  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
199 200
  copy_region (&srcPR, &destPR);

201
  /* copy the parasites */
202 203
  GIMP_DRAWABLE (new_channel)->parasites =
    parasite_list_copy (GIMP_DRAWABLE (channel)->parasites);
204

Elliot Lee's avatar
Elliot Lee committed
205 206 207 208 209 210
  /*  free up the channel_name memory  */
  g_free (channel_name);

  return new_channel;
}

211
void 
Michael Natterer's avatar
Michael Natterer committed
212 213
gimp_channel_set_color (GimpChannel   *channel,
			const GimpRGB *color)
214
{
215 216 217
  g_return_if_fail (channel != NULL);
  g_return_if_fail (GIMP_IS_CHANNEL (channel));
  g_return_if_fail (color != NULL);
218

219
  channel->color = *color;
220
}
221

222
const GimpRGB *
Michael Natterer's avatar
Michael Natterer committed
223
gimp_channel_get_color (const GimpChannel *channel)
224
{
225 226 227 228
  g_return_val_if_fail (channel != NULL, NULL);
  g_return_val_if_fail (GIMP_IS_CHANNEL (channel), NULL);

  return &channel->color;
229 230
}
 
231
gint
Michael Natterer's avatar
Michael Natterer committed
232
gimp_channel_get_opacity (const GimpChannel *channel)
233 234 235 236 237
{
  g_return_val_if_fail (channel != NULL, 0);
  g_return_val_if_fail (GIMP_IS_CHANNEL (channel), 0);

  return (gint) (channel->color.a * 100.999);
238 239
}

240
void 
Michael Natterer's avatar
Michael Natterer committed
241 242
gimp_channel_set_opacity (GimpChannel *channel,
			  gint         opacity)
243
{
244 245 246 247 248 249
  g_return_if_fail (channel != NULL);
  g_return_if_fail (GIMP_IS_CHANNEL (channel));

  opacity = CLAMP (opacity, 0, 100);

  channel->color.a = opacity / 100.0;
250 251
}

252 253 254 255 256 257 258 259 260 261
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
262 263 264 265 266 267
  /* free the segments?  */
  if (channel->segs_in)
    g_free (channel->segs_in);
  if (channel->segs_out)
    g_free (channel->segs_out);

268
  if (GTK_OBJECT_CLASS (parent_class)->destroy)
269
    GTK_OBJECT_CLASS (parent_class)->destroy (object);
Elliot Lee's avatar
Elliot Lee committed
270 271 272
}

void
Michael Natterer's avatar
Michael Natterer committed
273 274 275
gimp_channel_scale (GimpChannel *channel,
		    gint         new_width,
		    gint         new_height)
Elliot Lee's avatar
Elliot Lee committed
276
{
277
  PixelRegion  srcPR, destPR;
Elliot Lee's avatar
Elliot Lee committed
278 279 280 281 282 283
  TileManager *new_tiles;

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

  /*  Update the old channel position  */
284 285 286 287
  drawable_update (GIMP_DRAWABLE (channel),
		   0, 0,
		   GIMP_DRAWABLE (channel)->width,
		   GIMP_DRAWABLE (channel)->height);
Elliot Lee's avatar
Elliot Lee committed
288 289

  /*  Configure the pixel regions  */
290 291 292 293
  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
294 295 296 297 298 299 300 301 302

  /*  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  */
303
  undo_push_channel_mod (GIMP_DRAWABLE (channel)->gimage, channel);
Elliot Lee's avatar
Elliot Lee committed
304 305

  /*  Configure the new channel  */
306 307 308
  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
309 310 311 312 313

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

  /*  Update the new channel position  */
314 315 316 317
  drawable_update (GIMP_DRAWABLE (channel),
		   0, 0,
		   GIMP_DRAWABLE (channel)->width,
		   GIMP_DRAWABLE (channel)->height);
Elliot Lee's avatar
Elliot Lee committed
318 319 320
}

void
Michael Natterer's avatar
Michael Natterer committed
321 322 323 324 325
gimp_channel_resize (GimpChannel *channel,
		     gint         new_width,
		     gint         new_height,
		     gint         offx,
		     gint         offy)
Elliot Lee's avatar
Elliot Lee committed
326
{
327
  PixelRegion  srcPR, destPR;
Elliot Lee's avatar
Elliot Lee committed
328
  TileManager *new_tiles;
329 330 331 332
  guchar       bg = 0;
  gint         clear;
  gint         w, h;
  gint         x1, y1, x2, y2;
Elliot Lee's avatar
Elliot Lee committed
333 334 335 336

  if (!new_width || !new_height)
    return;

337 338 339 340
  x1 = CLAMP (offx, 0, new_width);
  y1 = CLAMP (offy, 0, new_height);
  x2 = CLAMP ((offx + GIMP_DRAWABLE (channel)->width), 0, new_width);
  y2 = CLAMP ((offy + GIMP_DRAWABLE (channel)->height), 0, new_height);
Elliot Lee's avatar
Elliot Lee committed
341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366
  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  */
367 368 369 370
  drawable_update (GIMP_DRAWABLE (channel),
		   0, 0,
		   GIMP_DRAWABLE (channel)->width,
		   GIMP_DRAWABLE (channel)->height);
Elliot Lee's avatar
Elliot Lee committed
371 372

  /*  Configure the pixel regions  */
373 374
  pixel_region_init (&srcPR, GIMP_DRAWABLE (channel)->tiles,
		     x1, y1, w, h, FALSE);
Elliot Lee's avatar
Elliot Lee committed
375 376

  /*  Determine whether the new channel needs to be initially cleared  */
377 378
  if ((new_width  > GIMP_DRAWABLE (channel)->width) ||
      (new_height > GIMP_DRAWABLE (channel)->height) ||
Elliot Lee's avatar
Elliot Lee committed
379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
      (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  */
400
  undo_push_channel_mod (GIMP_DRAWABLE (channel)->gimage, channel);
Elliot Lee's avatar
Elliot Lee committed
401 402

  /*  Configure the new channel  */
403 404 405
  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
406 407 408 409 410

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

  /*  update the new channel area  */
411 412 413 414
  drawable_update (GIMP_DRAWABLE (channel),
		   0, 0,
		   GIMP_DRAWABLE (channel)->width,
		   GIMP_DRAWABLE (channel)->height);
Elliot Lee's avatar
Elliot Lee committed
415 416
}

417
void            
Michael Natterer's avatar
Michael Natterer committed
418
gimp_channel_update (GimpChannel *channel)
419
{
420 421 422 423 424
  drawable_update (GIMP_DRAWABLE (channel),
		   0, 0,
		   GIMP_DRAWABLE (channel)->width,
		   GIMP_DRAWABLE (channel)->height);
  gdisplays_flush ();
425 426
}

427 428 429
/**********************/
/*  access functions  */
/**********************/
Elliot Lee's avatar
Elliot Lee committed
430

431
gboolean
Michael Natterer's avatar
Michael Natterer committed
432
gimp_channel_toggle_visibility (GimpChannel *channel)
Elliot Lee's avatar
Elliot Lee committed
433
{
434
  GIMP_DRAWABLE (channel)->visible = !GIMP_DRAWABLE (channel)->visible;
Elliot Lee's avatar
Elliot Lee committed
435

436
  return GIMP_DRAWABLE (channel)->visible;
Elliot Lee's avatar
Elliot Lee committed
437 438
}

439
TempBuf *
Michael Natterer's avatar
Michael Natterer committed
440 441 442
gimp_channel_preview (GimpChannel *channel,
		      gint         width,
		      gint         height)
Elliot Lee's avatar
Elliot Lee committed
443
{
444 445
  /* Ok prime the cache with a large preview if the cache is invalid */
  if (! GIMP_DRAWABLE (channel)->preview_valid &&
446 447
      width  <= PREVIEW_CACHE_PRIME_WIDTH      &&
      height <= PREVIEW_CACHE_PRIME_HEIGHT     &&
448 449 450 451
      GIMP_DRAWABLE (channel)->gimage          &&
      GIMP_DRAWABLE (channel)->gimage->width  > PREVIEW_CACHE_PRIME_WIDTH   &&
      GIMP_DRAWABLE (channel)->gimage->height > PREVIEW_CACHE_PRIME_HEIGHT)
    {
Michael Natterer's avatar
Michael Natterer committed
452 453 454
      TempBuf * tb = gimp_channel_preview_private (channel,
						   PREVIEW_CACHE_PRIME_WIDTH,
						   PREVIEW_CACHE_PRIME_HEIGHT);
455 456 457 458 459 460 461
      
      /* Save the 2nd call */
      if (width  == PREVIEW_CACHE_PRIME_WIDTH &&
	  height == PREVIEW_CACHE_PRIME_HEIGHT)
	return tb;
    }

462
  /* Second call - should NOT visit the tile cache... */
Michael Natterer's avatar
Michael Natterer committed
463
  return gimp_channel_preview_private (channel, width, height);
464 465 466
}

static TempBuf *
Michael Natterer's avatar
Michael Natterer committed
467 468 469
gimp_channel_preview_private (GimpChannel *channel,
			      gint         width,
			      gint         height)
470 471 472 473 474 475
{
  MaskBuf     *preview_buf;
  PixelRegion  srcPR;
  PixelRegion  destPR;
  gint         subsample;
  TempBuf     *ret_buf;
Elliot Lee's avatar
Elliot Lee committed
476

477 478 479
  g_return_val_if_fail (channel != NULL, NULL);
  g_return_val_if_fail (GIMP_IS_CHANNEL (channel), NULL);
  
Elliot Lee's avatar
Elliot Lee committed
480
  /*  The easy way  */
481 482 483 484
  if (GIMP_DRAWABLE (channel)->preview_valid &&
      (ret_buf =
       gimp_preview_cache_get (& (GIMP_DRAWABLE (channel)->preview_cache),
			       width, height)))
485 486 487
    {
      return ret_buf;
    }
Elliot Lee's avatar
Elliot Lee committed
488 489 490 491 492
  /*  The hard way  */
  else
    {
      /*  calculate 'acceptable' subsample  */
      subsample = 1;
493 494
      if (width < 1) width = 1;
      if (height < 1) height = 1;
495 496
      while ((width  * (subsample + 1) * 2 < GIMP_DRAWABLE (channel)->width) &&
	     (height * (subsample + 1) * 2 < GIMP_DRAWABLE (channel)->height))
Elliot Lee's avatar
Elliot Lee committed
497 498
	subsample = subsample + 1;

499 500 501 502
      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
503 504

      preview_buf = mask_buf_new (width, height);
505 506 507 508 509
      destPR.bytes     = 1;
      destPR.x         = 0;
      destPR.y         = 0;
      destPR.w         = width;
      destPR.h         = height;
Elliot Lee's avatar
Elliot Lee committed
510
      destPR.rowstride = width;
511
      destPR.data      = mask_buf_data (preview_buf);
Elliot Lee's avatar
Elliot Lee committed
512 513 514

      subsample_region (&srcPR, &destPR, subsample);

515 516 517 518 519 520
      if (!GIMP_DRAWABLE (channel)->preview_valid)
	gimp_preview_cache_invalidate (&(GIMP_DRAWABLE(channel)->preview_cache));

      GIMP_DRAWABLE (channel)->preview_valid = TRUE;
      gimp_preview_cache_add (&(GIMP_DRAWABLE (channel)->preview_cache),
			      preview_buf);
521
      return preview_buf;
Elliot Lee's avatar
Elliot Lee committed
522 523 524
    }
}

525 526 527
/******************************/
/*  selection mask functions  */
/******************************/
Elliot Lee's avatar
Elliot Lee committed
528

Michael Natterer's avatar
Michael Natterer committed
529 530 531 532
GimpChannel *
gimp_channel_new_mask (GimpImage *gimage,
		       gint       width,
		       gint       height)
Elliot Lee's avatar
Elliot Lee committed
533
{
Michael Natterer's avatar
Michael Natterer committed
534 535
  GimpRGB      black = { 0.0, 0.0, 0.0, 0.5 };
  GimpChannel *new_channel;
Elliot Lee's avatar
Elliot Lee committed
536 537

  /*  Create the new channel  */
Michael Natterer's avatar
Michael Natterer committed
538 539
  new_channel = gimp_channel_new (gimage, width, height,
				  _("Selection Mask"), &black);
Elliot Lee's avatar
Elliot Lee committed
540 541

  /*  Set the validate procedure  */
542
  tile_manager_set_validate_proc (GIMP_DRAWABLE (new_channel)->tiles,
Michael Natterer's avatar
Michael Natterer committed
543
				  gimp_channel_validate);
Elliot Lee's avatar
Elliot Lee committed
544 545 546 547

  return new_channel;
}

548
gboolean
Michael Natterer's avatar
Michael Natterer committed
549 550 551 552 553 554 555 556 557
gimp_channel_boundary (GimpChannel  *mask,
		       BoundSeg    **segs_in,
		       BoundSeg    **segs_out,
		       gint         *num_segs_in,
		       gint         *num_segs_out,
		       gint          x1,
		       gint          y1,
		       gint          x2,
		       gint          y2)
Elliot Lee's avatar
Elliot Lee committed
558
{
559
  gint        x3, y3, x4, y4;
Elliot Lee's avatar
Elliot Lee committed
560 561 562 563 564 565 566 567 568 569
  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);

Michael Natterer's avatar
Michael Natterer committed
570
      if (gimp_channel_bounds (mask, &x3, &y3, &x4, &y4))
Elliot Lee's avatar
Elliot Lee committed
571
	{
572 573
	  pixel_region_init (&bPR, GIMP_DRAWABLE (mask)->tiles,
			     x3, y3, (x4 - x3), (y4 - y3), FALSE);
Elliot Lee's avatar
Elliot Lee committed
574 575 576 577
	  mask->segs_out = find_mask_boundary (&bPR, &mask->num_segs_out,
					       IgnoreBounds,
					       x1, y1,
					       x2, y2);
578 579 580 581
	  x1 = MAX (x1, x3);
	  y1 = MAX (y1, y3);
	  x2 = MIN (x2, x4);
	  y2 = MIN (y2, y4);
Elliot Lee's avatar
Elliot Lee committed
582 583 584

	  if (x2 > x1 && y2 > y1)
	    {
585 586 587 588
	      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
589 590 591 592 593 594 595
	      mask->segs_in =  find_mask_boundary (&bPR, &mask->num_segs_in,
						   WithinBounds,
						   x1, y1,
						   x2, y2);
	    }
	  else
	    {
596
	      mask->segs_in     = NULL;
Elliot Lee's avatar
Elliot Lee committed
597 598 599 600 601
	      mask->num_segs_in = 0;
	    }
	}
      else
	{
602 603 604
	  mask->segs_in      = NULL;
	  mask->segs_out     = NULL;
	  mask->num_segs_in  = 0;
Elliot Lee's avatar
Elliot Lee committed
605 606 607 608 609
	  mask->num_segs_out = 0;
	}
      mask->boundary_known = TRUE;
    }

610 611 612
  *segs_in      = mask->segs_in;
  *segs_out     = mask->segs_out;
  *num_segs_in  = mask->num_segs_in;
Elliot Lee's avatar
Elliot Lee committed
613 614 615 616 617
  *num_segs_out = mask->num_segs_out;

  return TRUE;
}

618
gint
Michael Natterer's avatar
Michael Natterer committed
619 620 621
gimp_channel_value (GimpChannel *mask,
		    gint         x,
		    gint         y)
Elliot Lee's avatar
Elliot Lee committed
622 623
{
  Tile *tile;
624
  gint  val;
Elliot Lee's avatar
Elliot Lee committed
625 626 627 628 629 630 631 632 633 634 635

  /*  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
    {
636 637
      if (x < 0 || x >= GIMP_DRAWABLE (mask)->width ||
	  y < 0 || y >= GIMP_DRAWABLE (mask)->height)
Elliot Lee's avatar
Elliot Lee committed
638 639 640
	return 0;
    }

641 642
  tile = tile_manager_get_tile (GIMP_DRAWABLE (mask)->tiles, x, y, TRUE, FALSE);
  val = *(guchar *) (tile_data_pointer (tile, x % TILE_WIDTH, y % TILE_HEIGHT));
643
  tile_release (tile, FALSE);
Elliot Lee's avatar
Elliot Lee committed
644 645 646 647

  return val;
}

648
gboolean
Michael Natterer's avatar
Michael Natterer committed
649 650 651 652 653
gimp_channel_bounds (GimpChannel *mask,
		     gint        *x1,
		     gint        *y1,
		     gint        *x2,
		     gint        *y2)
Elliot Lee's avatar
Elliot Lee committed
654
{
655 656 657 658 659 660 661
  PixelRegion  maskPR;
  guchar      *data, *data1;
  gint         x, y;
  gint         ex, ey;
  gint         tx1, tx2, ty1, ty2;
  gint         minx, maxx;
  gpointer     pr;
662

Elliot Lee's avatar
Elliot Lee committed
663 664 665 666 667 668 669 670
  /*  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;

671
      return !mask->empty;
Elliot Lee's avatar
Elliot Lee committed
672 673 674
    }

  /*  go through and calculate the bounds  */
675 676
  tx1 = GIMP_DRAWABLE (mask)->width;
  ty1 = GIMP_DRAWABLE (mask)->height;
677 678
  tx2 = 0;
  ty2 = 0;
Elliot Lee's avatar
Elliot Lee committed
679

680 681 682 683 684 685 686
  pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
		     0, 0,
		     GIMP_DRAWABLE (mask)->width,
		     GIMP_DRAWABLE (mask)->height, FALSE);
  for (pr = pixel_regions_register (1, &maskPR);
       pr != NULL;
       pr = pixel_regions_process (pr))
Elliot Lee's avatar
Elliot Lee committed
687
    {
688
      data1 = data = maskPR.data;
Elliot Lee's avatar
Elliot Lee committed
689 690
      ex = maskPR.x + maskPR.w;
      ey = maskPR.y + maskPR.h;
691 692
      /* only check the pixels if this tile is not fully within the currently
	 computed bounds */
693 694
      if (maskPR.x < tx1 || ex > tx2 ||
	  maskPR.y < ty1 || ey > ty2)
695
        {
696 697 698 699 700 701 702 703 704 705 706 707 708 709
	  /* 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
710
	    for (y = maskPR.y; y < ey; y++, data1 += maskPR.rowstride)
Elliot Lee's avatar
Elliot Lee committed
711
	    {
712
	      for (x = maskPR.x, data = data1; x < ex; x++, data++)
713
		if (*data)
714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
		{
		  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
729 730 731 732
	    }
	}
    }

733 734
  tx2 = CLAMP (tx2 + 1, 0, GIMP_DRAWABLE (mask)->width);
  ty2 = CLAMP (ty2 + 1, 0, GIMP_DRAWABLE (mask)->height);
Elliot Lee's avatar
Elliot Lee committed
735

736
  if (tx1 == GIMP_DRAWABLE (mask)->width && ty1 == GIMP_DRAWABLE (mask)->height)
Elliot Lee's avatar
Elliot Lee committed
737 738
    {
      mask->empty = TRUE;
739 740 741 742
      mask->x1    = 0;
      mask->y1    = 0;
      mask->x2    = GIMP_DRAWABLE (mask)->width;
      mask->y2    = GIMP_DRAWABLE (mask)->height;
Elliot Lee's avatar
Elliot Lee committed
743 744 745 746
    }
  else
    {
      mask->empty = FALSE;
747 748 749 750
      mask->x1    = tx1;
      mask->y1    = ty1;
      mask->x2    = tx2;
      mask->y2    = ty2;
Elliot Lee's avatar
Elliot Lee committed
751 752 753
    }
  mask->bounds_known = TRUE;

754 755 756 757 758
  *x1 = tx1;
  *x2 = tx2;
  *y1 = ty1;
  *y2 = ty2;

759
  return !mask->empty;
Elliot Lee's avatar
Elliot Lee committed
760 761
}

762
gboolean
Michael Natterer's avatar
Michael Natterer committed
763
gimp_channel_is_empty (GimpChannel *mask)
Elliot Lee's avatar
Elliot Lee committed
764
{
765 766 767 768
  PixelRegion  maskPR;
  guchar      *data;
  gint         x, y;
  gpointer     pr;
Elliot Lee's avatar
Elliot Lee committed
769 770 771 772

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

773 774 775 776 777 778 779
  pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
		     0, 0,
		     GIMP_DRAWABLE (mask)->width,
		     GIMP_DRAWABLE (mask)->height, FALSE);
  for (pr = pixel_regions_register (1, &maskPR);
       pr != NULL;
       pr = pixel_regions_process (pr))
Elliot Lee's avatar
Elliot Lee committed
780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797
    {
      /*  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);

798 799 800 801 802 803
  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;
Elliot Lee's avatar
Elliot Lee committed
804
  mask->boundary_known = TRUE;
805 806 807 808
  mask->x1             = 0;
  mask->y1             = 0;
  mask->x2             = GIMP_DRAWABLE (mask)->width;
  mask->y2             = GIMP_DRAWABLE (mask)->height;
Elliot Lee's avatar
Elliot Lee committed
809 810 811 812 813

  return TRUE;
}

void
Michael Natterer's avatar
Michael Natterer committed
814 815 816 817 818
gimp_channel_add_segment (GimpChannel *mask,
			  gint         x,
			  gint         y,
			  gint         width,
			  gint         value)
Elliot Lee's avatar
Elliot Lee committed
819
{
820 821 822 823 824
  PixelRegion  maskPR;
  guchar      *data;
  gint         val;
  gint         x2;
  gpointer     pr;
Elliot Lee's avatar
Elliot Lee committed
825 826 827 828

  /*  check horizontal extents...  */
  x2 = x + width;
  if (x2 < 0) x2 = 0;
829
  if (x2 > GIMP_DRAWABLE (mask)->width) x2 = GIMP_DRAWABLE (mask)->width;
Elliot Lee's avatar
Elliot Lee committed
830
  if (x < 0) x = 0;
831
  if (x > GIMP_DRAWABLE (mask)->width) x = GIMP_DRAWABLE (mask)->width;
Elliot Lee's avatar
Elliot Lee committed
832 833 834
  width = x2 - x;
  if (!width) return;

835
  if (y < 0 || y > GIMP_DRAWABLE (mask)->height)
Elliot Lee's avatar
Elliot Lee committed
836 837
    return;

838 839 840 841 842
  pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
		     x, y, width, 1, TRUE);
  for (pr = pixel_regions_register (1, &maskPR);
       pr != NULL;
       pr = pixel_regions_process (pr))
Elliot Lee's avatar
Elliot Lee committed
843 844 845 846 847 848 849 850 851 852 853 854 855 856
    {
      data = maskPR.data;
      width = maskPR.w;
      while (width--)
	{
	  val = *data + value;
	  if (val > 255)
	    val = 255;
	  *data++ = val;
	}
    }
}

void
Michael Natterer's avatar
Michael Natterer committed
857 858 859 860 861
gimp_channel_sub_segment (GimpChannel *mask,
			  gint         x,
			  gint         y,
			  gint         width,
			  gint         value)
Elliot Lee's avatar
Elliot Lee committed
862
{
863 864 865 866 867
  PixelRegion  maskPR;
  guchar      *data;
  gint         val;
  gint         x2;
  gpointer     pr;
Elliot Lee's avatar
Elliot Lee committed
868 869 870 871

  /*  check horizontal extents...  */
  x2 = x + width;
  if (x2 < 0) x2 = 0;
872
  if (x2 > GIMP_DRAWABLE (mask)->width) x2 = GIMP_DRAWABLE (mask)->width;
Elliot Lee's avatar
Elliot Lee committed
873
  if (x < 0) x = 0;
874
  if (x > GIMP_DRAWABLE (mask)->width) x = GIMP_DRAWABLE (mask)->width;
Elliot Lee's avatar
Elliot Lee committed
875 876 877
  width = x2 - x;
  if (!width) return;

878
  if (y < 0 || y > GIMP_DRAWABLE (mask)->height)
Elliot Lee's avatar
Elliot Lee committed
879 880
    return;

881 882 883 884
  pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles, x, y, width, 1, TRUE);
  for (pr = pixel_regions_register (1, &maskPR);
       pr != NULL;
       pr = pixel_regions_process (pr))
Elliot Lee's avatar
Elliot Lee committed
885 886 887 888 889 890 891 892 893 894 895 896 897 898
    {
      data = maskPR.data;
      width = maskPR.w;
      while (width--)
	{
	  val = *data - value;
	  if (val < 0)
	    val = 0;
	  *data++ = val;
	}
    }
}

void
Michael Natterer's avatar
Michael Natterer committed
899 900 901 902 903 904
gimp_channel_combine_rect (GimpChannel *mask,
			   ChannelOps   op,
			   gint         x,
			   gint         y,
			   gint         w,
			   gint         h)
Elliot Lee's avatar
Elliot Lee committed
905
{
906
  gint        x2, y2;
Elliot Lee's avatar
Elliot Lee committed
907
  PixelRegion maskPR;
908
  guchar      color;
909

910 911
  y2 = y + h;
  x2 = x + w;
Elliot Lee's avatar
Elliot Lee committed
912

913 914 915 916
  x  = CLAMP (x,  0, GIMP_DRAWABLE (mask)->width);
  y  = CLAMP (y,  0, GIMP_DRAWABLE (mask)->height);
  x2 = CLAMP (x2, 0, GIMP_DRAWABLE (mask)->width);
  y2 = CLAMP (y2, 0, GIMP_DRAWABLE (mask)->height);
Elliot Lee's avatar
Elliot Lee committed
917

918
  if (x2 - x <= 0 || y2 - y <= 0)
Elliot Lee's avatar
Elliot Lee committed
919 920
    return;

921 922
  pixel_region_init (&maskPR, GIMP_DRAWABLE (mask)->tiles,
		     x, y, x2 - x, y2 - y, TRUE);
923
  if (op == CHANNEL_OP_ADD  || op == CHANNEL_OP_REPLACE)
924 925 926
    color = 255;
  else
    color = 0;
927
  color_region (&maskPR, &color);
Elliot Lee's avatar
Elliot Lee committed
928 929

  /*  Determine new boundary  */
930
  if (mask->bounds_known && (op == CHANNEL_OP_ADD) && !mask->empty)
Elliot Lee's avatar
Elliot Lee committed
931 932 933 934 935 936 937 938 939 940
    {
      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);
    }
941
  else if (op == CHANNEL_OP_REPLACE || mask->empty)
Elliot Lee's avatar
Elliot Lee committed
942 943 944 945 946 947 948 949 950 951
    {
      mask->empty = FALSE;
      mask->x1 = x;
      mask->y1 = y;
      mask->x2 = x + w;
      mask->y2 = y + h;
    }
  else
    mask->bounds_known = FALSE;

952 953 954 955
  mask->x1 = CLAMP (mask->x1, 0, GIMP_DRAWABLE (mask)->width);
  mask->y1 = CLAMP (mask->y1, 0, GIMP_DRAWABLE (mask)->height);
  mask->x2 = CLAMP (mask->x2, 0, GIMP_DRAWABLE (mask)->width);
  mask->y2 = CLAMP (mask->y2, 0, GIMP_DRAWABLE (mask)->height);
Elliot Lee's avatar
Elliot Lee committed
956 957 958
}

void
Michael Natterer's avatar
Michael Natterer committed
959 960 961 962 963 964 965
gimp_channel_combine_ellipse (GimpChannel *mask,
			      ChannelOps   op,
			      gint         x,
			      gint         y,
			      gint         w,
			      gint         h,
			      gboolean     antialias)
Elliot Lee's avatar
Elliot Lee committed
966
{
967 968 969
  gint   i, j;
  gint   x0, x1, x2;
  gint   val, last;
970 971 972 973 974 975 976 977
  gfloat a_sqr, b_sqr, aob_sqr;
  gfloat w_sqr, h_sqr;
  gfloat y_sqr;
  gfloat t0, t1;
  gfloat r;
  gfloat cx, cy;
  gfloat rad;
  gfloat dist;
Elliot Lee's avatar
Elliot Lee committed
978 979 980 981 982 983 984 985 986 987 988 989 990

  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++)
    {
991
      if (i >= 0 && i < GIMP_DRAWABLE (mask)->height)
Elliot Lee's avatar
Elliot Lee committed
992 993
	{
	  /*  Non-antialiased code  */
994
	  if (!antialias)
Elliot Lee's avatar
Elliot Lee committed
995 996 997 998 999 1000 1001 1002
	    {
	      y_sqr = (i + 0.5 - cy) * (i + 0.5 - cy);
	      rad = sqrt (a_sqr - a_sqr * y_sqr / (double) b_sqr);
	      x1 = ROUND (cx -