gimpimage-resize.c 111 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
/* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
18

19 20
#include "config.h"

21
#include <string.h>
22

Sven Neumann's avatar
Sven Neumann committed
23 24
#include <gtk/gtk.h>

25
#include "libgimpcolor/gimpcolor.h"
26
#include "libgimpmath/gimpmath.h"
27
#include "libgimpbase/gimpbase.h"
28

Michael Natterer's avatar
Michael Natterer committed
29 30
#include "core-types.h"

Michael Natterer's avatar
Michael Natterer committed
31 32 33 34
#include "base/pixel-region.h"
#include "base/temp-buf.h"
#include "base/tile-manager.h"
#include "base/tile.h"
Sven Neumann's avatar
Sven Neumann committed
35

36 37
#include "paint-funcs/paint-funcs.h"

38
#include "gimp.h"
39
#include "gimpcontext.h"
Michael Natterer's avatar
Michael Natterer committed
40
#include "gimpcoreconfig.h"
41
#include "gimpimage.h"
Michael Natterer's avatar
Michael Natterer committed
42
#include "gimpimage-colorhash.h"
43
#include "gimpimage-mask.h"
44
#include "gimpimage-undo.h"
45
#include "gimplayer.h"
46
#include "gimplayermask.h"
47
#include "gimplist.h"
48
#include "gimpmarshal.h"
Manish Singh's avatar
Manish Singh committed
49
#include "gimpparasite.h"
50
#include "gimpparasitelist.h"
51
#include "gimpundostack.h"
52 53 54

#include "floating_sel.h"
#include "gdisplay.h"
55
#include "path.h"
56
#include "undo.h"
57

58 59
#include "libgimp/gimpintl.h"

60

61 62 63 64 65 66 67
#ifdef DEBUG
#define TRC(x) printf x
#else
#define TRC(x)
#endif


68
/*  Local function declarations  */
69 70 71 72 73
static void     gimp_image_class_init            (GimpImageClass *klass);
static void     gimp_image_init                  (GimpImage      *gimage);
static void     gimp_image_destroy               (GtkObject      *object);
static void     gimp_image_name_changed          (GimpObject     *object);
static void     gimp_image_invalidate_preview    (GimpViewable   *viewable);
74
static void     gimp_image_size_changed          (GimpViewable   *viewable);
Michael Natterer's avatar
Michael Natterer committed
75 76
static void     gimp_image_real_colormap_changed (GimpImage      *gimage,
						  gint            ncol);
77
static TempBuf *gimp_image_get_preview           (GimpViewable   *gimage,
78 79
						  gint            width,
						  gint            height);
80
static TempBuf *gimp_image_get_new_preview       (GimpViewable   *viewable,
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106
						  gint            width, 
						  gint            height);
static void     gimp_image_free_projection       (GimpImage      *gimage);
static void     gimp_image_allocate_shadow       (GimpImage      *gimage,
						  gint            width,
						  gint            height,
						  gint            bpp);
static void     gimp_image_allocate_projection   (GimpImage      *gimage);
static void     gimp_image_construct_layers      (GimpImage      *gimage,
						  gint            x,
						  gint            y,
						  gint            w,
						  gint            h);
static void     gimp_image_construct_channels    (GimpImage      *gimage,
						  gint            x,
						  gint            y,
						  gint            w,
						  gint            h);
static void     gimp_image_initialize_projection (GimpImage      *gimage,
						  gint            x,
						  gint            y,
						  gint            w,
						  gint            h);
static void     gimp_image_get_active_channels   (GimpImage      *gimage,
						  GimpDrawable   *drawable,
						  gint           *active);
107 108 109 110 111
static void     gimp_image_construct             (GimpImage      *gimage,
						  gint            x,
						  gint            y,
						  gint            w,
						  gint            h);
112 113

/*  projection functions  */
114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
static void     project_intensity                (GimpImage      *gimage,
						  GimpLayer      *layer,
						  PixelRegion    *src,
						  PixelRegion    *dest,
						  PixelRegion    *mask);
static void     project_intensity_alpha          (GimpImage      *gimage,
						  GimpLayer      *layer,
						  PixelRegion    *src,
						  PixelRegion    *dest,
						  PixelRegion    *mask);
static void     project_indexed                  (GimpImage      *gimage,
						  GimpLayer      *layer,
						  PixelRegion    *src,
						  PixelRegion    *dest);
static void     project_indexed_alpha            (GimpImage      *gimage, 
						  GimpLayer      *layer,
						  PixelRegion    *src, 
						  PixelRegion    *dest,
						  PixelRegion    *mask);
static void     project_channel                  (GimpImage      *gimage,
						  GimpChannel    *channel,
						  PixelRegion    *src,
						  PixelRegion    *src2);
137 138 139 140

/*
 *  Global variables
 */
141
static gint valid_combinations[][MAX_CHANNELS + 1] =
142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
{
  /* RGB GIMAGE */
  { -1, -1, -1, COMBINE_INTEN_INTEN, COMBINE_INTEN_INTEN_A },
  /* RGBA GIMAGE */
  { -1, -1, -1, COMBINE_INTEN_A_INTEN, COMBINE_INTEN_A_INTEN_A },
  /* GRAY GIMAGE */
  { -1, COMBINE_INTEN_INTEN, COMBINE_INTEN_INTEN_A, -1, -1 },
  /* GRAYA GIMAGE */
  { -1, COMBINE_INTEN_A_INTEN, COMBINE_INTEN_A_INTEN_A, -1, -1 },
  /* INDEXED GIMAGE */
  { -1, COMBINE_INDEXED_INDEXED, COMBINE_INDEXED_INDEXED_A, -1, -1 },
  /* INDEXEDA GIMAGE */
  { -1, -1, COMBINE_INDEXED_A_INDEXED_A, -1, -1 },
};


/*
 *  Static variables
 */

162 163
enum
{
164
  MODE_CHANGED,
165
  ALPHA_CHANGED,
166
  FLOATING_SELECTION_CHANGED,
167 168
  ACTIVE_LAYER_CHANGED,
  ACTIVE_CHANNEL_CHANGED,
169 170
  COMPONENT_VISIBILITY_CHANGED,
  COMPONENT_ACTIVE_CHANGED,
171
  MASK_CHANGED,
172

173
  CLEAN,
174
  DIRTY,
Michael Natterer's avatar
Michael Natterer committed
175
  UPDATE,
176
  COLORMAP_CHANGED,
177
  UNDO_EVENT,
178 179
  LAST_SIGNAL
};
180

181

182 183
static guint gimp_image_signals[LAST_SIGNAL] = { 0 };

184
static GimpViewableClass *parent_class = NULL;
185

186

187
GType 
188 189
gimp_image_get_type (void) 
{
190
  static GType image_type = 0;
191 192 193

  if (! image_type)
    {
194
      static const GTypeInfo image_info =
195 196
      {
        sizeof (GimpImageClass),
197 198 199 200 201 202 203 204
        NULL,           /* base_init */
        NULL,           /* base_finalize */
        (GClassInitFunc) gimp_image_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data */
        sizeof (GimpImage),
        0,              /* n_preallocs */
        (GInstanceInitFunc) gimp_image_init,
205 206
      };

207 208 209
      image_type = g_type_register_static (GIMP_TYPE_VIEWABLE,
					   "GimpImage",
					   &image_info, 0);
210 211 212 213 214
    }

  return image_type;
}

215 216 217
static void
gimp_image_class_init (GimpImageClass *klass)
{
218 219 220
  GtkObjectClass    *object_class;
  GimpObjectClass   *gimp_object_class;
  GimpViewableClass *viewable_class;
221

222 223
  object_class      = (GtkObjectClass *) klass;
  gimp_object_class = (GimpObjectClass *) klass;
224
  viewable_class    = (GimpViewableClass *) klass;
225

226
  parent_class = g_type_class_peek_parent (klass);
227

228
  gimp_image_signals[MODE_CHANGED] =
229 230 231 232 233 234 235
    g_signal_new ("mode_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, mode_changed),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);
236

237
  gimp_image_signals[ALPHA_CHANGED] =
238 239 240 241 242 243 244
    g_signal_new ("alpha_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, alpha_changed),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);
245

246
  gimp_image_signals[FLOATING_SELECTION_CHANGED] =
247 248 249 250 251 252 253
    g_signal_new ("floating_selection_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, floating_selection_changed),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);
254

255
  gimp_image_signals[ACTIVE_LAYER_CHANGED] =
256 257 258 259 260 261 262
    g_signal_new ("active_layer_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, active_layer_changed),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);
263 264

  gimp_image_signals[ACTIVE_CHANNEL_CHANGED] =
265 266 267 268 269 270 271
    g_signal_new ("active_channel_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, active_channel_changed),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);
272

273
  gimp_image_signals[COMPONENT_VISIBILITY_CHANGED] =
274 275 276 277 278 279 280 281
    g_signal_new ("component_visibility_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, component_visibility_changed),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__INT,
		  G_TYPE_NONE, 1,
		  G_TYPE_INT);
282 283

  gimp_image_signals[COMPONENT_ACTIVE_CHANGED] =
284 285 286 287 288 289 290 291
    g_signal_new ("component_active_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, component_active_changed),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__INT,
		  G_TYPE_NONE, 1,
		  G_TYPE_INT);
292

293
  gimp_image_signals[MASK_CHANGED] =
294 295 296 297 298 299 300
    g_signal_new ("mask_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, mask_changed),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);
301

302
  gimp_image_signals[CLEAN] =
303 304 305 306 307 308 309
    g_signal_new ("clean",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, clean),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);
310

311
  gimp_image_signals[DIRTY] =
312 313 314 315 316 317 318
    g_signal_new ("dirty",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, dirty),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__VOID,
		  G_TYPE_NONE, 0);
319

Michael Natterer's avatar
Michael Natterer committed
320
  gimp_image_signals[UPDATE] =
321 322 323 324 325 326 327 328 329 330 331
    g_signal_new ("update",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, update),
		  NULL, NULL,
		  gimp_cclosure_marshal_VOID__INT_INT_INT_INT,
		  G_TYPE_NONE, 4,
		  G_TYPE_INT,
		  G_TYPE_INT,
		  G_TYPE_INT,
		  G_TYPE_INT);
332

333
  gimp_image_signals[COLORMAP_CHANGED] =
334 335 336 337 338 339 340 341
    g_signal_new ("colormap_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, colormap_changed),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__INT,
		  G_TYPE_NONE, 1,
		  G_TYPE_INT);
342

343
  gimp_image_signals[UNDO_EVENT] = 
344 345 346 347 348 349 350 351
    g_signal_new ("undo_event",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, undo_event),
		  NULL, NULL,
		  g_cclosure_marshal_VOID__INT,
		  G_TYPE_NONE, 1,
		  G_TYPE_INT);
352

353
  object_class->destroy               = gimp_image_destroy;
354

355
  gimp_object_class->name_changed     = gimp_image_name_changed;
356

357
  viewable_class->invalidate_preview  = gimp_image_invalidate_preview;
358
  viewable_class->size_changed        = gimp_image_size_changed;
359 360
  viewable_class->get_preview         = gimp_image_get_preview;
  viewable_class->get_new_preview     = gimp_image_get_new_preview;
361

362
  klass->mode_changed                 = NULL;
363
  klass->alpha_changed                = NULL;
364
  klass->floating_selection_changed   = NULL;
365 366 367 368
  klass->active_layer_changed         = NULL;
  klass->active_channel_changed       = NULL;
  klass->component_visibility_changed = NULL;
  klass->component_active_changed     = NULL;
369
  klass->mask_changed                 = NULL;
370

371 372
  klass->clean                        = NULL;
  klass->dirty                        = NULL;
Michael Natterer's avatar
Michael Natterer committed
373
  klass->update                       = NULL;
Michael Natterer's avatar
Michael Natterer committed
374
  klass->colormap_changed             = gimp_image_real_colormap_changed;
375 376 377
  klass->undo_event                   = NULL;
  klass->undo                         = gimp_image_undo;
  klass->redo                         = gimp_image_redo;
Michael Natterer's avatar
Michael Natterer committed
378 379

  gimp_image_color_hash_init ();
380 381 382 383 384
}


/* static functions */

Sven Neumann's avatar
Sven Neumann committed
385 386
static void 
gimp_image_init (GimpImage *gimage)
387
{
388
  gimage->ID                    = 0;
389

390 391 392 393
  gimage->save_proc             = NULL;

  gimage->width                 = 0;
  gimage->height                = 0;
394 395 396
  gimage->xresolution           = 1.0;
  gimage->yresolution           = 1.0;
  gimage->unit                  = GIMP_UNIT_INCH;
397 398
  gimage->base_type             = RGB;

399
  gimage->cmap                  = NULL;
400 401
  gimage->num_cols              = 0;

402
  gimage->dirty                 = 1;
403
  gimage->undo_on               = TRUE;
404 405 406 407

  gimage->instance_count        = 0;
  gimage->disp_count            = 0;

408
  gimage->tattoo_state          = 0;
409 410 411 412 413

  gimage->shadow                = NULL;

  gimage->construct_flag        = -1;
  gimage->proj_type             = RGBA_GIMAGE;
414
  gimage->projection            = NULL;
415

416
  gimage->guides                = NULL;
417

418 419 420 421
  gimage->layers                = gimp_list_new (GIMP_TYPE_LAYER, 
						 GIMP_CONTAINER_POLICY_STRONG);
  gimage->channels              = gimp_list_new (GIMP_TYPE_CHANNEL, 
						 GIMP_CONTAINER_POLICY_STRONG);
422
  gimage->layer_stack           = NULL;
423 424 425 426 427 428

  gimage->active_layer          = NULL;
  gimage->active_channel        = NULL;
  gimage->floating_sel          = NULL;
  gimage->selection_mask        = NULL;

429
  gimage->parasites             = gimp_parasite_list_new ();
430 431 432 433 434 435 436 437 438

  gimage->paths                 = NULL;

  gimage->qmask_state           = FALSE;
  gimage->qmask_color.r         = 1.0;
  gimage->qmask_color.g         = 0.0;
  gimage->qmask_color.b         = 0.0;
  gimage->qmask_color.a         = 0.5;

439 440 441 442
  gimage->undo_stack            = NULL;
  gimage->redo_stack            = NULL;
  gimage->undo_bytes            = 0;
  gimage->undo_levels           = 0;
443
  gimage->group_count           = 0;
444
  gimage->pushing_undo_group    = UNDO_NULL;
445 446
  gimage->undo_history          = NULL;

447 448 449
  gimage->new_undo_stack        = gimp_undo_stack_new (gimage);
  gimage->new_redo_stack        = gimp_undo_stack_new (gimage);

450
  gimage->comp_preview          = NULL;
451
  gimage->comp_preview_valid    = FALSE;
452 453
}

454 455
static void
gimp_image_destroy (GtkObject *object)
Sven Neumann's avatar
Sven Neumann committed
456
{
457 458 459 460
  GimpImage *gimage;

  gimage = GIMP_IMAGE (object);

461 462
  g_hash_table_remove (gimage->gimp->image_table,
		       GINT_TO_POINTER (gimage->ID));
463

464 465 466 467 468
  gimp_image_free_projection (gimage);
  gimp_image_free_shadow (gimage);
  
  if (gimage->cmap)
    g_free (gimage->cmap);
469
  
470 471
  g_object_unref (G_OBJECT (gimage->layers));
  g_object_unref (G_OBJECT (gimage->channels));
472
  g_slist_free (gimage->layer_stack);
473

474
  g_object_unref (G_OBJECT (gimage->selection_mask));
475

476 477 478 479
  if (gimage->comp_preview)
    temp_buf_free (gimage->comp_preview);

  if (gimage->parasites)
480
    g_object_unref (G_OBJECT (gimage->parasites));
481

Michael Natterer's avatar
Michael Natterer committed
482 483 484
  g_list_foreach (gimage->guides, (GFunc) g_free, NULL);
  g_list_free (gimage->guides);

485 486
  undo_free (gimage);

487 488
  g_object_unref (G_OBJECT (gimage->new_undo_stack));
  g_object_unref (G_OBJECT (gimage->new_redo_stack));
489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506
}

static void
gimp_image_name_changed (GimpObject *object)
{
  GimpImage   *gimage;
  const gchar *name;

  if (GIMP_OBJECT_CLASS (parent_class)->name_changed)
    GIMP_OBJECT_CLASS (parent_class)->name_changed (object);

  gimage = GIMP_IMAGE (object);
  name   = gimp_object_get_name (object);

  if (! (name && strlen (name)))
    {
      g_free (object->name);
      object->name = NULL;
507
    }
508
}
509

510 511 512 513 514
static void
gimp_image_invalidate_preview (GimpViewable *viewable)
{
  GimpImage *gimage;

515 516 517
  if (GIMP_VIEWABLE_CLASS (parent_class)->invalidate_preview)
    GIMP_VIEWABLE_CLASS (parent_class)->invalidate_preview (viewable);

518 519 520
  gimage = GIMP_IMAGE (viewable);

  gimage->comp_preview_valid = FALSE;
521 522
}

523 524 525 526 527 528 529 530 531 532 533 534 535 536
static void
gimp_image_size_changed (GimpViewable *viewable)
{
  GimpImage *gimage;

  if (GIMP_VIEWABLE_CLASS (parent_class)->size_changed)
    GIMP_VIEWABLE_CLASS (parent_class)->size_changed (viewable);

  gimage = GIMP_IMAGE (viewable);

  gimp_image_invalidate_layer_previews (gimage);
  gimp_image_invalidate_channel_previews (gimage);
}

Michael Natterer's avatar
Michael Natterer committed
537 538 539 540 541 542 543 544
static void 
gimp_image_real_colormap_changed (GimpImage *gimage,
				  gint       ncol)
{
  if (gimp_image_base_type (gimage) == INDEXED)
    gimp_image_color_hash_invalidate (gimage, ncol);
}

545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566
static void
gimp_image_allocate_projection (GimpImage *gimage)
{
  if (gimage->projection)
    gimp_image_free_projection (gimage);

  /*  Find the number of bytes required for the projection.
   *  This includes the intensity channels and an alpha channel
   *  if one doesn't exist.
   */
  switch (gimp_image_base_type (gimage))
    {
    case RGB:
    case INDEXED:
      gimage->proj_bytes = 4;
      gimage->proj_type = RGBA_GIMAGE;
      break;
    case GRAY:
      gimage->proj_bytes = 2;
      gimage->proj_type = GRAYA_GIMAGE;
      break;
    default:
567
      g_assert_not_reached ();
568 569 570
    }

  /*  allocate the new projection  */
571 572
  gimage->projection = tile_manager_new (gimage->width, gimage->height,
					 gimage->proj_bytes);
573
  tile_manager_set_user_data (gimage->projection, (void *) gimage);
574 575 576 577 578 579 580 581 582 583 584 585 586
  tile_manager_set_validate_proc (gimage->projection, gimp_image_validate);
}

static void
gimp_image_free_projection (GimpImage *gimage)
{
  if (gimage->projection)
    tile_manager_destroy (gimage->projection);

  gimage->projection = NULL;
}

static void
Sven Neumann's avatar
Sven Neumann committed
587
gimp_image_allocate_shadow (GimpImage *gimage, 
588 589 590
			    gint       width, 
			    gint       height, 
			    gint       bpp)
591 592 593 594 595 596 597 598 599
{
  /*  allocate the new projection  */
  gimage->shadow = tile_manager_new (width, height, bpp);
}


/* function definitions */

GimpImage *
600 601
gimp_image_new (Gimp              *gimp,
		gint               width,
602 603
		gint               height,
		GimpImageBaseType  base_type)
604
{
605 606 607 608 609 610
  GimpImage *gimage;
  gint       i;

  g_return_val_if_fail (gimp != NULL, NULL);
  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);

Michael Natterer's avatar
Michael Natterer committed
611
  gimage = GIMP_IMAGE (g_object_new (GIMP_TYPE_IMAGE, NULL));
612

613 614 615 616 617 618 619 620 621 622 623 624 625 626
  gimage->gimp        = gimp;
  gimage->ID          = gimp->next_image_ID++;

  g_hash_table_insert (gimp->image_table,
		       GINT_TO_POINTER (gimage->ID),
		       (gpointer) gimage);

  gimage->width       = width;
  gimage->height      = height;
  gimage->base_type   = base_type;

  gimage->xresolution = gimp->config->default_xresolution;
  gimage->yresolution = gimp->config->default_yresolution;
  gimage->unit        = gimp->config->default_units;
627 628 629 630 631 632 633 634 635

  switch (base_type)
    {
    case RGB:
    case GRAY:
      break;
    case INDEXED:
      /* always allocate 256 colors for the colormap */
      gimage->num_cols = 0;
636
      gimage->cmap     = (guchar *) g_malloc0 (COLORMAP_SIZE);
637 638 639 640 641 642 643 644
      break;
    default:
      break;
    }

  /*  set all color channels visible and active  */
  for (i = 0; i < MAX_CHANNELS; i++)
    {
645 646
      gimage->visible[i] = TRUE;
      gimage->active[i]  = TRUE;
647 648 649
    }

  /* create the selection mask */
Michael Natterer's avatar
Michael Natterer committed
650 651 652
  gimage->selection_mask = gimp_channel_new_mask (gimage,
						  gimage->width,
						  gimage->height);
653 654 655 656 657


  return gimage;
}

658 659 660 661 662 663 664 665 666 667
gint
gimp_image_get_ID (GimpImage *gimage)
{
  g_return_val_if_fail (gimage != NULL, -1);
  g_return_val_if_fail (GIMP_IS_IMAGE (gimage), -1);

  return gimage->ID;
}

GimpImage *
668 669
gimp_image_get_by_ID (Gimp *gimp,
		      gint  image_id)
670
{
671 672 673 674
  g_return_val_if_fail (gimp != NULL, NULL);
  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);

  if (gimp->image_table == NULL)
675 676
    return NULL;

677
  return (GimpImage *) g_hash_table_lookup (gimp->image_table, 
678 679 680
					    GINT_TO_POINTER (image_id));
}

681
void
682 683
gimp_image_set_filename (GimpImage   *gimage,
			 const gchar *filename)
684
{
685 686
  gimp_object_set_name (GIMP_OBJECT (gimage), filename);
}
687

688
void
689
gimp_image_set_resolution (GimpImage *gimage,
690 691
			   gdouble    xresolution,
			   gdouble    yresolution)
692
{
693 694 695 696 697
  /* nothing to do if setting res to the same as before */
  if ((ABS (gimage->xresolution - xresolution) < 1e-5) &&
      (ABS (gimage->yresolution - yresolution) < 1e-5))
      return;

698 699 700
  /* don't allow to set the resolution out of bounds */
  if (xresolution < GIMP_MIN_RESOLUTION || xresolution > GIMP_MAX_RESOLUTION ||
      yresolution < GIMP_MIN_RESOLUTION || yresolution > GIMP_MAX_RESOLUTION)
701 702
    return;

703
  undo_push_resolution (gimage);
704

705 706
  gimage->xresolution = xresolution;
  gimage->yresolution = yresolution;
707 708 709

  /* really just want to recalc size and repaint */
  gdisplays_shrink_wrap (gimage);
710 711
}

712
void
713 714 715
gimp_image_get_resolution (const GimpImage *gimage,
			   gdouble         *xresolution,
			   gdouble         *yresolution)
716
{
717 718
  g_return_if_fail (xresolution && yresolution);

719 720
  *xresolution = gimage->xresolution;
  *yresolution = gimage->yresolution;
721 722
}

723 724
void
gimp_image_set_unit (GimpImage *gimage,
725
		     GimpUnit   unit)
726
{
727 728
  undo_push_resolution (gimage);

729 730 731
  gimage->unit = unit;
}

732
GimpUnit
733
gimp_image_get_unit (const GimpImage *gimage)
734 735 736 737
{
  return gimage->unit;
}

738
void
Sven Neumann's avatar
Sven Neumann committed
739 740
gimp_image_set_save_proc (GimpImage     *gimage, 
			  PlugInProcDef *proc)
741 742 743 744 745
{
  gimage->save_proc = proc;
}

PlugInProcDef *
746
gimp_image_get_save_proc (const GimpImage *gimage)
747 748 749
{
  return gimage->save_proc;
}
750

751 752 753 754 755 756 757 758 759 760 761 762
gint
gimp_image_get_width (const GimpImage *gimage)
{
  return gimage->width;
}

gint
gimp_image_get_height (const GimpImage *gimage)
{
  return gimage->height;
}

763
void
764
gimp_image_resize (GimpImage *gimage, 
765 766 767 768
		   gint       new_width, 
		   gint       new_height,
		   gint       offset_x, 
		   gint       offset_y)
769
{
Michael Natterer's avatar
Michael Natterer committed
770 771 772
  GimpChannel *channel;
  GimpLayer   *layer;
  GimpLayer   *floating_layer;
773
  GList       *list;
Michael Natterer's avatar
Michael Natterer committed
774
  GList       *guide_list;
775

776
  gimp_set_busy (gimage->gimp);
777

778
  g_assert (new_width > 0 && new_height > 0);
779 780 781 782

  /*  Get the floating layer if one exists  */
  floating_layer = gimp_image_floating_sel (gimage);

Sven Neumann's avatar
Sven Neumann committed
783
  undo_push_group_start (gimage, IMAGE_RESIZE_UNDO);
784 785 786 787 788 789 790 791 792

  /*  Relax the floating selection  */
  if (floating_layer)
    floating_sel_relax (floating_layer, TRUE);

  /*  Push the image size to the stack  */
  undo_push_gimage_mod (gimage);

  /*  Set the new width and height  */
793
  gimage->width  = new_width;
794 795 796
  gimage->height = new_height;

  /*  Resize all channels  */
797 798 799
  for (list = GIMP_LIST (gimage->channels)->list; 
       list; 
       list = g_list_next (list))
800
    {
Michael Natterer's avatar
Michael Natterer committed
801
      channel = (GimpChannel *) list->data;
802

Michael Natterer's avatar
Michael Natterer committed
803
      gimp_channel_resize (channel, new_width, new_height, offset_x, offset_y);
804 805 806 807 808 809
    }

  /*  Reposition or remove any guides  */
  guide_list = gimage->guides;
  while (guide_list)
    {
Michael Natterer's avatar
Michael Natterer committed
810
      GimpGuide *guide;
811

Michael Natterer's avatar
Michael Natterer committed
812
      guide = (GimpGuide *) guide_list->data;
Sven Neumann's avatar
Sven Neumann committed
813
      guide_list = g_list_next (guide_list);
814 815 816

      switch (guide->orientation)
	{
817
	case ORIENTATION_HORIZONTAL:
Sven Neumann's avatar
Sven Neumann committed
818
	  undo_push_guide (gimage, guide);
819 820 821 822
	  guide->position += offset_y;
	  if (guide->position < 0 || guide->position > new_height)
	    gimp_image_delete_guide (gimage, guide);
	  break;
823

824
	case ORIENTATION_VERTICAL:
Sven Neumann's avatar
Sven Neumann committed
825
	  undo_push_guide (gimage, guide);
826 827 828 829
	  guide->position += offset_x;
	  if (guide->position < 0 || guide->position > new_width)
	    gimp_image_delete_guide (gimage, guide);
	  break;
830

831
	default:
832
	  g_error ("Unknown guide orientation\n");
833
	}
834 835 836
    }

  /*  Don't forget the selection mask!  */
Michael Natterer's avatar
Michael Natterer committed
837 838
  gimp_channel_resize (gimage->selection_mask,
		       new_width, new_height, offset_x, offset_y);
839 840 841
  gimage_mask_invalidate (gimage);

  /*  Reposition all layers  */
842 843 844
  for (list = GIMP_LIST (gimage->layers)->list; 
       list; 
       list = g_list_next (list))
845
    {
846
      layer = (GimpLayer *) list->data;
847

848
      gimp_layer_translate (layer, offset_x, offset_y);
849 850 851 852 853 854 855 856 857
    }

  /*  Make sure the projection matches the gimage size  */
  gimp_image_projection_realloc (gimage);

  /*  Rigor the floating selection  */
  if (floating_layer)
    floating_sel_rigor (floating_layer, TRUE);

858 859
  undo_push_group_end (gimage);

860
  gimp_viewable_size_changed (GIMP_VIEWABLE (gimage));
861

862
  gimp_unset_busy (gimage->gimp);
863 864 865
}

void
866
gimp_image_scale (GimpImage *gimage, 
867 868
		  gint       new_width, 
		  gint       new_height)
869
{
Michael Natterer's avatar
Michael Natterer committed
870 871 872
  GimpChannel *channel;
  GimpLayer   *layer;
  GimpLayer   *floating_layer;
873
  GList       *list;
Michael Natterer's avatar
Michael Natterer committed
874
  GSList      *remove = NULL;
875
  GSList      *slist;
Michael Natterer's avatar
Michael Natterer committed
876
  GimpGuide   *guide;
Michael Natterer's avatar
Michael Natterer committed
877 878 879 880
  gint         old_width;
  gint         old_height;
  gdouble      img_scale_w = 1.0;
  gdouble      img_scale_h = 1.0;
881

882
  if ((new_width == 0) || (new_height == 0))
883
    {
884 885
      g_message ("%s(): Scaling to zero width or height has been rejected.",
		 G_GNUC_FUNCTION);
886 887
      return;
    }
888

889
  gimp_set_busy (gimage->gimp);
890

891 892 893
  /*  Get the floating layer if one exists  */
  floating_layer = gimp_image_floating_sel (gimage);

Sven Neumann's avatar
Sven Neumann committed
894
  undo_push_group_start (gimage, IMAGE_SCALE_UNDO);
895 896 897 898 899 900 901 902 903

  /*  Relax the floating selection  */
  if (floating_layer)
    floating_sel_relax (floating_layer, TRUE);

  /*  Push the image size to the stack  */
  undo_push_gimage_mod (gimage);

  /*  Set the new width and height  */
904 905 906

  old_width      = gimage->width;
  old_height     = gimage->height;
907
  gimage->width  = new_width;
908
  gimage->height = new_height;
909 910
  img_scale_w    = (gdouble) new_width  / (gdouble) old_width;
  img_scale_h    = (gdouble) new_height / (gdouble) old_height;
911
 
912
  /*  Scale all channels  */
913 914 915
  for (list = GIMP_LIST (gimage->channels)->list; 
       list; 
       list = g_list_next (list))
916
    {
Michael Natterer's avatar
Michael Natterer committed
917 918 919
      channel = (GimpChannel *) list->data;

      gimp_channel_scale (channel, new_width, new_height);
920 921 922
    }

  /*  Don't forget the selection mask!  */
923
  /*  if (channel_is_empty(gimage->selection_mask))
Michael Natterer's avatar
Michael Natterer committed
924
        gimp_channel_resize(gimage->selection_mask, new_width, new_height, 0, 0)
925 926
      else
  */
Michael Natterer's avatar
Michael Natterer committed
927

Michael Natterer's avatar
Michael Natterer committed
928
  gimp_channel_scale (gimage->selection_mask, new_width, new_height);
929 930 931
  gimage_mask_invalidate (gimage);

  /*  Scale all layers  */
932 933 934
  for (list = GIMP_LIST (gimage->layers)->list; 
       list; 
       list = g_list_next (list))
935
    {
936 937
      layer = (GimpLayer *) list->data;

Michael Natterer's avatar
Michael Natterer committed
938
      if (! gimp_layer_scale_by_factors (layer, img_scale_w, img_scale_h))
939
	{
940 941 942 943 944
	  /* Since 0 < img_scale_w, img_scale_h, failure due to one or more
	   * vanishing scaled layer dimensions. Implicit delete implemented
	   * here. Upstream warning implemented in resize_check_layer_scaling()
	   * [resize.c line 1295], which offers the user the chance to bail out.
	   */
945
          remove = g_slist_append (remove, layer);
946 947
        }
    }
948

Michael Natterer's avatar
Michael Natterer committed
949 950 951
  /* We defer removing layers lost to scaling until now so as not to mix
   * the operations of iterating over and removal from gimage->layers.
   */  
952