jpeg-load.c 85.5 KB
Newer Older
Elliot Lee's avatar
Elliot Lee committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
16
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Elliot Lee's avatar
Elliot Lee committed
17
18
19
20
21
22
23
24
25
26
 */

/* JPEG loading and saving file filter for the GIMP
 *  -Peter Mattis
 *
 * This filter is heavily based upon the "example.c" file in libjpeg.
 * In fact most of the loading and saving code was simply cut-and-pasted
 *  from that file. The filter, therefore, also uses libjpeg.
 */

27
28
29
30
31
32
33
34
35
36
37
/* 11-JAN-99 - Added support for JPEG comments and Progressive saves.
 *  -pete whiting <pwhiting@sprint.net>
 *
 * Comments of size up to 32k can be stored in the header of jpeg
 * files.  (They are not compressed.)  The JPEG specs and libraries
 * support the storing of multiple comments.  The behavior of this
 * code is to merge all comments in a loading image into a single
 * comment (putting \n between each) and attach that string as a
 * parasite - gimp-comment - to the image.  When saving, the image is
 * checked to see if it has the gimp-comment parasite - if so, that is
 * used as the default comment in the save dialog.  Further, the other
38
 * jpeg parameters (quality, smoothing, compression and progressive)
39
40
 * are attached to the image as a parasite.  This allows the
 * parameters to remain consistent between saves.  I was not able to
41
 * figure out how to determine the quality, smoothing or compression
42
43
44
45
46
47
 * values of an image as it is being loaded, but the code is there to
 * support it if anyone knows how.  Progressive mode is a method of
 * saving the image such that as a browser (or other app supporting
 * progressive loads - gimp doesn't) loads the image it first gets a
 * low res version displayed and then the image is progressively
 * enhanced until you get the final version.  It doesn't add any size
48
49
50
 * to the image (actually it often results in smaller file size) - the
 * only draw backs are that progressive jpegs are not supported by some
 * older viewers/browsers, and some might find it annoying.
51
52
 */

53
/*
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
 * 21-AUG-99 - Added support for JPEG previews, subsampling,
 *             non-baseline JPEGs, restart markers and DCT method choice
 * - Steinar H. Gunderson <sgunderson@bigfoot.com>
 *
 * A small preview appears and changes according to the changes to the
 * compression options. The image itself works as a much bigger preview.
 * For slower machines, the save operation (not the load operation) is
 * done in the background, with a standard GTK+ idle loop, which turned
 * out to be the most portable way. Win32 porters shouldn't have much
 * difficulty porting my changes (at least I hope so...).
 *
 * Subsampling is a pretty obscure feature, but I thought it might be nice
 * to have it in anyway, for people to play with :-) Does anybody have
 * any better suggestions than the ones I've put in the menu? (See wizard.doc
 * from the libjpeg distribution for a tiny bit of information on subsampling.)
 *
 * A baseline JPEG is often larger and/or of worse quality than a non-baseline
 * one (especially at low quality settings), but all decoders are guaranteed
 * to read baseline JPEGs (I think). Not all will read a non-baseline one.
 *
 * Restart markers are useful if you are transmitting the image over an
 * unreliable network. If a file gets corrupted, it will only be corrupted
 * up to the next restart marker. Of course, if there are no restart markers,
 * the rest of the image will be corrupted. Restart markers take up extra
 * space. The libjpeg developers recommend a restart every 1 row for
 * transmitting images over unreliable networks, such as Usenet.
 *
 * The DCT method is said by the libjpeg docs to _only_ influence quality vs.
 * speed, and nothing else. However, I've found that there _are_ size
 * differences. Fast integer, on the other hand, is faster than integer,
 * which in turn is faster than FP. According to the libjpeg docs (and I
 * believe it's true), FP has only a theoretical advantage in quality, and
 * will be slower than the two other methods, unless you're blessed with
 * very a fast FPU. (In addition, images might not be identical on
 * different types of FP hardware.)
 *
 * ...and thus ends my additions to the JPEG plug-in. I hope. *sigh* :-)
 */

93
/*
94
95
96
97
98
99
100
101
102
103
104
105
 * 21-AUG-99 - Bunch O' Fixes.
 * - Adam D. Moss <adam@gimp.org>
 *
 * We now correctly create an alpha-padded layer for our preview --
 * having a non-background non-alpha layer is a no-no in GIMP.
 *
 * I've also tweaked the GIMP undo API a little and changed the JPEG
 * plugin to use gimp_image_{freeze,thaw}_undo so that it doesn't store
 * up a whole load of superfluous tile data every time the preview is
 * changed.
 */

106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
/*
 * 22-DEC-99 - volatiles added
 * - Austin Donnelly <austin@gimp.org>
 *
 * When gcc complains a variable may be clobbered by a longjmp or
 * vfork, it means the following: setjmp() was called by the JPEG
 * library for error recovery purposes, but gcc is keeping some
 * variables in registers without updating the memory locations on the
 * stack consistently.  If JPEG error recovery is every invoked, the
 * values of these variable will be inconsistent.  This is almost
 * always a bug, but not one that's commonly seen unless JPEG recovery
 * code is exercised frequently.  The correct solution is to tell gcc
 * to keep the stack version of the affected variables up to date, by
 * using the "volatile" keyword.   Here endeth the lesson.
 */

122
123
124
125
126
127
128
129
/*
 * 4-SEP-01 - remove the use of GtkText
 * - DindinX <David@dindinx.org>
 *
 * The new version of GTK+ does not support GtkText anymore.
 * I've just replaced the one used for the image comment by
 * a GtkTextView/GtkTextBuffer couple;
 */
130

131
132
133
134
/*
 * 22-JUN-03 - add support for keeping EXIF information
 * - Dave Neary <bolsh@gimp.org>
 *
135
 * This is little more than a modified version fo a patch from the
136
 * libexif owner (Lutz Muller) which attaches exif information to
137
138
 * a GimpImage, and if there is infoprmation available at save
 * time, writes it out. No modification of the exif data is
139
140
141
 * currently possible.
 */

142
143
144
145
146
147
148
149
/*
 * 15-NOV-04 - add support for EXIF JPEG thumbnail reading and writing
 * - S. Mukund <muks@mukund.org>
 *
 * Digital cameras store a TIFF APP1 marker that contains various
 * parameters of the shot along with a thumbnail image.
 */

Sven Neumann's avatar
Sven Neumann committed
150
#include "config.h"   /* configure cares about HAVE_PROGRESSIVE_JPEG */
Tor Lillqvist's avatar
Tor Lillqvist committed
151

Sven Neumann's avatar
Sven Neumann committed
152
#include <glib.h>     /* We want glib.h first because of some
Sven Neumann's avatar
Sven Neumann committed
153
154
                       * pretty obscure Win32 compilation issues.
                       */
155
#include <errno.h>
Elliot Lee's avatar
Elliot Lee committed
156
#include <setjmp.h>
157
#include <signal.h>
Elliot Lee's avatar
Elliot Lee committed
158
159
160
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
161
#include <sys/types.h>
162
#include <sys/stat.h>
Tor Lillqvist's avatar
Tor Lillqvist committed
163
#ifdef HAVE_UNISTD_H
164
#include <unistd.h>
Tor Lillqvist's avatar
Tor Lillqvist committed
165
#endif
Elliot Lee's avatar
Elliot Lee committed
166
#include <jpeglib.h>
167
#include <jerror.h>
168

169
170
171
172
#ifdef HAVE_EXIF
#include <libexif/exif-data.h>
#endif /* HAVE_EXIF */

Michael Natterer's avatar
Michael Natterer committed
173
174
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
175

176
177
#include "libgimp/stdplugins-intl.h"

Sven Neumann's avatar
Sven Neumann committed
178
#define SCALE_WIDTH         125
Elliot Lee's avatar
Elliot Lee committed
179

180
181
/* if you are not compiling this from inside the gimp tree, you have to  */
/* take care yourself if your JPEG library supports progressive mode     */
182
/* #undef HAVE_PROGRESSIVE_JPEG   if your library doesn't support it     */
183
184
/* #define HAVE_PROGRESSIVE_JPEG  if your library knows how to handle it */

185
/* See bugs #63610 and #61088 for a discussion about the quality settings */
186
#define DEFAULT_QUALITY     85
Sven Neumann's avatar
Sven Neumann committed
187
#define DEFAULT_SMOOTHING   0.0
188
189
190
#define DEFAULT_OPTIMIZE    TRUE
#define DEFAULT_PROGRESSIVE FALSE
#define DEFAULT_BASELINE    TRUE
Sven Neumann's avatar
Sven Neumann committed
191
192
193
#define DEFAULT_SUBSMP      0
#define DEFAULT_RESTART     0
#define DEFAULT_DCT         0
194
195
#define DEFAULT_PREVIEW     FALSE
#define DEFAULT_EXIF        TRUE
196
#define DEFAULT_THUMBNAIL   FALSE
197
198

/* sg - these should not be global... */
199
200
201
202
203
204
205
206
207
static  gint32 volatile  image_ID_global       = -1;
static  gint32           orig_image_ID_global  = -1;
static  gint32           drawable_ID_global    = -1;
static  gint32           layer_ID_global       = -1;
static  GtkWidget       *preview_size          = NULL;
static  GimpDrawable    *drawable_global       = NULL;
static  gboolean         undo_touched          = FALSE;
static  gint32           display_ID            = 0;

208

Elliot Lee's avatar
Elliot Lee committed
209
210
typedef struct
{
211
212
213
214
215
216
217
218
219
220
  gdouble  quality;
  gdouble  smoothing;
  gboolean optimize;
  gboolean progressive;
  gboolean baseline;
  gint     subsmp;
  gint     restart;
  gint     dct;
  gboolean preview;
  gboolean save_exif;
221
  gboolean save_thumbnail;
Elliot Lee's avatar
Elliot Lee committed
222
223
} JpegSaveVals;

224
typedef struct
225
226
{
  struct jpeg_compress_struct cinfo;
227
  struct jpeg_error_mgr jerr;
228
229
  gint          tile_height;
  FILE         *outfile;
230
  gboolean      has_alpha;
231
232
233
234
  gint          rowstride;
  guchar       *temp;
  guchar       *data;
  guchar       *src;
Sven Neumann's avatar
Sven Neumann committed
235
236
  GimpDrawable *drawable;
  GimpPixelRgn  pixel_rgn;
237
  const gchar  *file_name;
Sven Neumann's avatar
Sven Neumann committed
238
239
240
241
  gboolean      abort_me;
} PreviewPersistent;

static gboolean *abort_me = NULL;
Sven Neumann's avatar
Sven Neumann committed
242

243

Elliot Lee's avatar
Elliot Lee committed
244
245
/* Declare local functions.
 */
Sven Neumann's avatar
Sven Neumann committed
246
247
248
249
250
251
252
253
254
static void      query               (void);
static void      run                 (const gchar      *name,
                                      gint              nparams,
                                      const GimpParam  *param,
                                      gint             *nreturn_vals,
                                      GimpParam       **return_vals);
static gint32    load_image          (const gchar      *filename,
                                      GimpRunMode       runmode,
                                      gboolean          preview);
255
256
257
258
259
260
261
262
263
264
265
266
#ifdef HAVE_EXIF

static gint32    load_thumbnail_image(const gchar      *filename,
                                      gint             *width,
                                      gint             *height);

static gint      create_thumbnail    (gint32            image_ID,
                                      gint32            drawable_ID,
                                      gchar           **thumbnail_buffer);

#endif /* HAVE_EXIF */

Sven Neumann's avatar
Sven Neumann committed
267
268
269
270
271
272
273
274
275
276
277
278
279
static gboolean  save_image          (const gchar      *filename,
                                      gint32            image_ID,
                                      gint32            drawable_ID,
                                      gint32            orig_image_ID,
                                      gboolean          preview);

static gboolean  save_dialog         (void);

static void      make_preview        (void);
static void      destroy_preview     (void);

static void      save_restart_update (GtkAdjustment    *adjustment,
                                      GtkWidget        *toggle);
280

Elliot Lee's avatar
Elliot Lee committed
281

Sven Neumann's avatar
Sven Neumann committed
282
GimpPlugInInfo PLUG_IN_INFO =
Elliot Lee's avatar
Elliot Lee committed
283
{
284
285
286
287
  NULL,  /* init_proc  */
  NULL,  /* quit_proc  */
  query, /* query_proc */
  run,   /* run_proc   */
Elliot Lee's avatar
Elliot Lee committed
288
289
290
291
};

static JpegSaveVals jsvals =
{
292
293
294
  DEFAULT_QUALITY,
  DEFAULT_SMOOTHING,
  DEFAULT_OPTIMIZE,
295
296
297
298
299
  DEFAULT_PROGRESSIVE,
  DEFAULT_BASELINE,
  DEFAULT_SUBSMP,
  DEFAULT_RESTART,
  DEFAULT_DCT,
300
  DEFAULT_PREVIEW,
301
302
  DEFAULT_EXIF,
  DEFAULT_THUMBNAIL
Elliot Lee's avatar
Elliot Lee committed
303
304
305
};


Sven Neumann's avatar
Sven Neumann committed
306
static gchar     *image_comment         = NULL;
307
308
309
static GtkWidget *restart_markers_scale = NULL;
static GtkWidget *restart_markers_label = NULL;

310
311
312
#ifdef HAVE_EXIF
static ExifData  *exif_data             = NULL;
#endif /* HAVE_EXIF */
Sven Neumann's avatar
Sven Neumann committed
313

314

Elliot Lee's avatar
Elliot Lee committed
315
316
MAIN ()

317

Elliot Lee's avatar
Elliot Lee committed
318
static void
319
query (void)
Elliot Lee's avatar
Elliot Lee committed
320
{
Sven Neumann's avatar
Sven Neumann committed
321
  static GimpParamDef load_args[] =
Elliot Lee's avatar
Elliot Lee committed
322
  {
Sven Neumann's avatar
Sven Neumann committed
323
324
325
    { GIMP_PDB_INT32,    "run_mode",     "Interactive, non-interactive" },
    { GIMP_PDB_STRING,   "filename",     "The name of the file to load" },
    { GIMP_PDB_STRING,   "raw_filename", "The name of the file to load" }
Elliot Lee's avatar
Elliot Lee committed
326
  };
Sven Neumann's avatar
Sven Neumann committed
327
  static GimpParamDef load_return_vals[] =
Elliot Lee's avatar
Elliot Lee committed
328
  {
Sven Neumann's avatar
Sven Neumann committed
329
    { GIMP_PDB_IMAGE,   "image",         "Output image" }
Elliot Lee's avatar
Elliot Lee committed
330
331
  };

332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
#ifdef HAVE_EXIF

  static GimpParamDef thumb_args[] =
  {
    { GIMP_PDB_STRING, "filename",     "The name of the file to load"  },
    { GIMP_PDB_INT32,  "thumb_size",   "Preferred thumbnail size"      }
  };
  static GimpParamDef thumb_return_vals[] =
  {
    { GIMP_PDB_IMAGE,  "image",        "Thumbnail image"               },
    { GIMP_PDB_INT32,  "image_width",  "Width of full-sized image"     },
    { GIMP_PDB_INT32,  "image_height", "Height of full-sized image"    }
  };

#endif /* HAVE_EXIF */

Sven Neumann's avatar
Sven Neumann committed
348
  static GimpParamDef save_args[] =
Elliot Lee's avatar
Elliot Lee committed
349
  {
Sven Neumann's avatar
Sven Neumann committed
350
351
352
353
354
355
356
357
358
359
360
361
362
363
    { GIMP_PDB_INT32,    "run_mode",     "Interactive, non-interactive" },
    { GIMP_PDB_IMAGE,    "image",        "Input image" },
    { GIMP_PDB_DRAWABLE, "drawable",     "Drawable to save" },
    { GIMP_PDB_STRING,   "filename",     "The name of the file to save the image in" },
    { GIMP_PDB_STRING,   "raw_filename", "The name of the file to save the image in" },
    { GIMP_PDB_FLOAT,    "quality",      "Quality of saved image (0 <= quality <= 1)" },
    { GIMP_PDB_FLOAT,    "smoothing",    "Smoothing factor for saved image (0 <= smoothing <= 1)" },
    { GIMP_PDB_INT32,    "optimize",     "Optimization of entropy encoding parameters (0/1)" },
    { GIMP_PDB_INT32,    "progressive",  "Enable progressive jpeg image loading - ignored if not compiled with HAVE_PROGRESSIVE_JPEG (0/1)" },
    { GIMP_PDB_STRING,   "comment",      "Image comment" },
    { GIMP_PDB_INT32,    "subsmp",       "The subsampling option number" },
    { GIMP_PDB_INT32,    "baseline",     "Force creation of a baseline JPEG (non-baseline JPEGs can't be read by all decoders) (0/1)" },
    { GIMP_PDB_INT32,    "restart",      "Frequency of restart markers (in rows, 0 = no restart markers)" },
    { GIMP_PDB_INT32,    "dct",          "DCT algorithm to use (speed/quality tradeoff)" }
Elliot Lee's avatar
Elliot Lee committed
364
365
366
  };

  gimp_install_procedure ("file_jpeg_load",
Marc Lehmann's avatar
Marc Lehmann committed
367
368
                          "loads files in the JPEG file format",
                          "loads files in the JPEG file format",
369
                          "Spencer Kimball, Peter Mattis & others",
Elliot Lee's avatar
Elliot Lee committed
370
                          "Spencer Kimball & Peter Mattis",
371
                          "1995-1999",
Sven Neumann's avatar
Sven Neumann committed
372
373
                          N_("JPEG image"),
                          NULL,
Sven Neumann's avatar
Sven Neumann committed
374
                          GIMP_PLUGIN,
375
376
                          G_N_ELEMENTS (load_args),
                          G_N_ELEMENTS (load_return_vals),
Elliot Lee's avatar
Elliot Lee committed
377
378
                          load_args, load_return_vals);

379
380
  gimp_register_file_handler_mime ("file_jpeg_load", "image/jpeg");
  gimp_register_magic_load_handler ("file_jpeg_load",
Sven Neumann's avatar
Sven Neumann committed
381
382
383
                                    "jpg,jpeg,jpe",
                                    "",
                                    "6,string,JFIF,6,string,Exif");
384

385
386
387
388
389
390
391
392
#ifdef HAVE_EXIF

  gimp_install_procedure ("file_jpeg_load_thumb",
                          "Loads a thumbnail from a JPEG image",
                          "Loads a thumbnail from a JPEG image (only if it exists)",
                          "S. Mukund <muks@mukund.org>, Sven Neumann <sven@gimp.org>",
                          "S. Mukund <muks@mukund.org>, Sven Neumann <sven@gimp.org>",
                          "November 15, 2004",
393
                          NULL,
394
395
396
397
398
399
400
401
402
403
                          NULL,
                          GIMP_PLUGIN,
                          G_N_ELEMENTS (thumb_args),
                          G_N_ELEMENTS (thumb_return_vals),
                          thumb_args, thumb_return_vals);

  gimp_register_thumbnail_loader ("file_jpeg_load", "file_jpeg_load_thumb");

#endif /* HAVE_EXIF */

Elliot Lee's avatar
Elliot Lee committed
404
  gimp_install_procedure ("file_jpeg_save",
Marc Lehmann's avatar
Marc Lehmann committed
405
406
                          "saves files in the JPEG file format",
                          "saves files in the lossy, widely supported JPEG format",
407
                          "Spencer Kimball, Peter Mattis & others",
Elliot Lee's avatar
Elliot Lee committed
408
                          "Spencer Kimball & Peter Mattis",
409
                          "1995-1999",
410
                          N_("JPEG image"),
Sven Neumann's avatar
Sven Neumann committed
411
                          "RGB*, GRAY*",
Sven Neumann's avatar
Sven Neumann committed
412
                          GIMP_PLUGIN,
413
                          G_N_ELEMENTS (save_args), 0,
Elliot Lee's avatar
Elliot Lee committed
414
415
                          save_args, NULL);

416
  gimp_register_file_handler_mime ("file_jpeg_save", "image/jpeg");
417
  gimp_register_save_handler ("file_jpeg_save", "jpg,jpeg,jpe", "");
Elliot Lee's avatar
Elliot Lee committed
418
419
420
}

static void
421
422
423
424
425
run (const gchar      *name,
     gint              nparams,
     const GimpParam  *param,
     gint             *nreturn_vals,
     GimpParam       **return_vals)
Elliot Lee's avatar
Elliot Lee committed
426
{
427
  static GimpParam   values[4];
428
429
430
431
432
433
434
435
  GimpRunMode        run_mode;
  GimpPDBStatusType  status = GIMP_PDB_SUCCESS;
  gint32             image_ID;
  gint32             drawable_ID;
  gint32             orig_image_ID;
  GimpParasite      *parasite;
  gboolean           err;
  GimpExportReturn   export = GIMP_EXPORT_CANCEL;
Elliot Lee's avatar
Elliot Lee committed
436
437
438

  run_mode = param[0].data.d_int32;

439
440
  INIT_I18N ();

Elliot Lee's avatar
Elliot Lee committed
441
  *nreturn_vals = 1;
442
  *return_vals  = values;
Sven Neumann's avatar
Sven Neumann committed
443
444
  values[0].type          = GIMP_PDB_STATUS;
  values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
445

Elliot Lee's avatar
Elliot Lee committed
446
447
  if (strcmp (name, "file_jpeg_load") == 0)
    {
448
      image_ID = load_image (param[1].data.d_string, run_mode, FALSE);
Elliot Lee's avatar
Elliot Lee committed
449
450

      if (image_ID != -1)
Sven Neumann's avatar
Sven Neumann committed
451
452
453
454
455
        {
          *nreturn_vals = 2;
          values[1].type         = GIMP_PDB_IMAGE;
          values[1].data.d_image = image_ID;
        }
Elliot Lee's avatar
Elliot Lee committed
456
      else
Sven Neumann's avatar
Sven Neumann committed
457
458
459
        {
          status = GIMP_PDB_EXECUTION_ERROR;
        }
Elliot Lee's avatar
Elliot Lee committed
460
    }
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497

#ifdef HAVE_EXIF

  else if (strcmp (name, "file_jpeg_load_thumb") == 0)
    {
      if (nparams < 2)
        {
          status = GIMP_PDB_CALLING_ERROR;
        }
      else
        {
          const gchar *filename = param[0].data.d_string;
          gint         width    = 0;
          gint         height   = 0;
          gint32       image_ID;

          image_ID = load_thumbnail_image (filename, &width, &height);

          if (image_ID != -1)
            {
              *nreturn_vals = 4;
              values[1].type         = GIMP_PDB_IMAGE;
              values[1].data.d_image = image_ID;
              values[2].type         = GIMP_PDB_INT32;
              values[2].data.d_int32 = width;
              values[3].type         = GIMP_PDB_INT32;
              values[3].data.d_int32 = height;
            }
          else
            {
              status = GIMP_PDB_EXECUTION_ERROR;
            }
        }
    }

#endif /* HAVE_EXIF */

Elliot Lee's avatar
Elliot Lee committed
498
499
  else if (strcmp (name, "file_jpeg_save") == 0)
    {
Sven Neumann's avatar
Sven Neumann committed
500
501
502
      image_ID = orig_image_ID = param[1].data.d_int32;
      drawable_ID = param[2].data.d_int32;

503
       /*  eventually export the image */
Sven Neumann's avatar
Sven Neumann committed
504
      switch (run_mode)
Sven Neumann's avatar
Sven Neumann committed
505
506
507
508
509
510
511
512
513
514
        {
        case GIMP_RUN_INTERACTIVE:
        case GIMP_RUN_WITH_LAST_VALS:
          gimp_ui_init ("jpeg", FALSE);
          export = gimp_export_image (&image_ID, &drawable_ID, "JPEG",
                                      (GIMP_EXPORT_CAN_HANDLE_RGB |
                                       GIMP_EXPORT_CAN_HANDLE_GRAY));
          switch (export)
            {
            case GIMP_EXPORT_EXPORT:
515
516
517
518
519
520
521
522
523
              {
                gchar *tmp = g_filename_from_utf8 (_("Export Preview"), -1,
                                                   NULL, NULL, NULL);
                if (tmp)
                  {
                    gimp_image_set_filename (image_ID, tmp);
                    g_free (tmp);
                  }

524
                display_ID = -1;
525
              }
Sven Neumann's avatar
Sven Neumann committed
526
527
528
529
530
531
532
533
534
535
536
537
              break;
            case GIMP_EXPORT_IGNORE:
              break;
            case GIMP_EXPORT_CANCEL:
              values[0].data.d_status = GIMP_PDB_CANCEL;
              return;
              break;
            }
          break;
        default:
          break;
        }
538

539
540
541
542
543
#ifdef HAVE_EXIF
      exif_data_unref (exif_data);
      exif_data = NULL;
#endif /* HAVE_EXIF */

Sven Neumann's avatar
Sven Neumann committed
544
545
      g_free (image_comment);
      image_comment = NULL;
546

Marc Lehmann's avatar
Marc Lehmann committed
547
      parasite = gimp_image_parasite_find (orig_image_ID, "gimp-comment");
548
      if (parasite)
Sven Neumann's avatar
Sven Neumann committed
549
        {
Michael Natterer's avatar
Michael Natterer committed
550
551
          image_comment = g_strndup (gimp_parasite_data (parasite),
                                     gimp_parasite_data_size (parasite));
Sven Neumann's avatar
Sven Neumann committed
552
553
          gimp_parasite_free (parasite);
        }
554

555
#ifdef HAVE_EXIF
556

557
      parasite = gimp_image_parasite_find (orig_image_ID, "exif-data");
558
559
      if (parasite)
        {
Michael Natterer's avatar
Michael Natterer committed
560
561
          exif_data = exif_data_new_from_data (gimp_parasite_data (parasite),
                                               gimp_parasite_data_size (parasite));
562
563
          gimp_parasite_free (parasite);
        }
564

565
566
#endif /* HAVE_EXIF */

567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
      jsvals.quality        = DEFAULT_QUALITY;
      jsvals.smoothing      = DEFAULT_SMOOTHING;
      jsvals.optimize       = DEFAULT_OPTIMIZE;
      jsvals.progressive    = DEFAULT_PROGRESSIVE;
      jsvals.baseline       = DEFAULT_BASELINE;
      jsvals.subsmp         = DEFAULT_SUBSMP;
      jsvals.restart        = DEFAULT_RESTART;
      jsvals.dct            = DEFAULT_DCT;
      jsvals.preview        = DEFAULT_PREVIEW;
      jsvals.save_exif      = DEFAULT_EXIF;
      jsvals.save_thumbnail = DEFAULT_THUMBNAIL;

#ifdef HAVE_EXIF

      if (exif_data && (exif_data->data))
        jsvals.save_thumbnail = TRUE;

#endif /* HAVE_EXIF */
585

Elliot Lee's avatar
Elliot Lee committed
586
      switch (run_mode)
Sven Neumann's avatar
Sven Neumann committed
587
588
589
590
591
592
593
594
595
596
        {
        case GIMP_RUN_INTERACTIVE:
          /*  Possibly retrieve data  */
          gimp_get_data ("file_jpeg_save", &jsvals);

          /* load up the previously used values */
          parasite = gimp_image_parasite_find (orig_image_ID,
                                               "jpeg-save-options");
          if (parasite)
            {
597
598
599
600
601
602
603
604
605
606
607
608
609
610
              const JpegSaveVals *save_vals = gimp_parasite_data (parasite);

              jsvals.quality        = save_vals->quality;
              jsvals.smoothing      = save_vals->smoothing;
              jsvals.optimize       = save_vals->optimize;
              jsvals.progressive    = save_vals->progressive;
              jsvals.baseline       = save_vals->baseline;
              jsvals.subsmp         = save_vals->subsmp;
              jsvals.restart        = save_vals->restart;
              jsvals.dct            = save_vals->dct;
              jsvals.preview        = save_vals->preview;
              jsvals.save_exif      = save_vals->save_exif;
              jsvals.save_thumbnail = save_vals->save_thumbnail;

Sven Neumann's avatar
Sven Neumann committed
611
612
              gimp_parasite_free (parasite);
            }
613

614
615
          if (jsvals.preview)
            {
616
617
              /* we freeze undo saving so that we can avoid sucking up
               * tile cache with our unneeded preview steps. */
618
619
620
621
              gimp_image_undo_freeze (image_ID);

              undo_touched = TRUE;
            }
622

Sven Neumann's avatar
Sven Neumann committed
623
624
625
626
          /* prepare for the preview */
          image_ID_global = image_ID;
          orig_image_ID_global = orig_image_ID;
          drawable_ID_global = drawable_ID;
627

Sven Neumann's avatar
Sven Neumann committed
628
629
          /*  First acquire information with a dialog  */
          err = save_dialog ();
630

631
632
          if (undo_touched)
            {
633
634
              /* thaw undo saving and flush the displays to have them
               * reflect the current shortcuts */
635
              gimp_image_undo_thaw (image_ID);
636
              gimp_displays_flush ();
637
            }
638
639

          if (!err)
Sven Neumann's avatar
Sven Neumann committed
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
            status = GIMP_PDB_CANCEL;
          break;

        case GIMP_RUN_NONINTERACTIVE:
          /*  Make sure all the arguments are there!  */
          /*  pw - added two more progressive and comment */
          /*  sg - added subsampling, preview, baseline, restarts and DCT */
          if (nparams != 14)
            {
              status = GIMP_PDB_CALLING_ERROR;
            }
          else
            {
              /* Once the PDB gets default parameters, remove this hack */
              if (param[5].data.d_float > 0.05)
                {
                  jsvals.quality     = 100.0 * param[5].data.d_float;
                  jsvals.smoothing   = param[6].data.d_float;
                  jsvals.optimize    = param[7].data.d_int32;
659
#ifdef HAVE_PROGRESSIVE_JPEG
Sven Neumann's avatar
Sven Neumann committed
660
                  jsvals.progressive = param[8].data.d_int32;
661
#endif /* HAVE_PROGRESSIVE_JPEG */
Sven Neumann's avatar
Sven Neumann committed
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
                  jsvals.baseline    = param[11].data.d_int32;
                  jsvals.subsmp      = param[10].data.d_int32;
                  jsvals.restart     = param[12].data.d_int32;
                  jsvals.dct         = param[13].data.d_int32;

                  /* free up the default -- wasted some effort earlier */
                  g_free (image_comment);
                  image_comment = g_strdup (param[9].data.d_string);
                }

              jsvals.preview = FALSE;

              if (jsvals.quality < 0.0 || jsvals.quality > 100.0)
                status = GIMP_PDB_CALLING_ERROR;
              else if (jsvals.smoothing < 0.0 || jsvals.smoothing > 1.0)
                status = GIMP_PDB_CALLING_ERROR;
              else if (jsvals.subsmp < 0 || jsvals.subsmp > 2)
                status = GIMP_PDB_CALLING_ERROR;
              else if (jsvals.dct < 0 || jsvals.dct > 2)
                status = GIMP_PDB_CALLING_ERROR;
            }
          break;

        case GIMP_RUN_WITH_LAST_VALS:
          /*  Possibly retrieve data  */
          gimp_get_data ("file_jpeg_save", &jsvals);

          parasite = gimp_image_parasite_find (orig_image_ID,
                                               "jpeg-save-options");
          if (parasite)
            {
693
694
695
696
697
698
699
700
701
702
              const JpegSaveVals *save_vals = gimp_parasite_data (parasite);

              jsvals.quality     = save_vals->quality;
              jsvals.smoothing   = save_vals->smoothing;
              jsvals.optimize    = save_vals->optimize;
              jsvals.progressive = save_vals->progressive;
              jsvals.baseline    = save_vals->baseline;
              jsvals.subsmp      = save_vals->subsmp;
              jsvals.restart     = save_vals->restart;
              jsvals.dct         = save_vals->dct;
Sven Neumann's avatar
Sven Neumann committed
703
              jsvals.preview     = FALSE;
704

Sven Neumann's avatar
Sven Neumann committed
705
706
707
708
709
710
711
              gimp_parasite_free (parasite);
            }
          break;

        default:
          break;
        }
Elliot Lee's avatar
Elliot Lee committed
712

Sven Neumann's avatar
Sven Neumann committed
713
      if (status == GIMP_PDB_SUCCESS)
Sven Neumann's avatar
Sven Neumann committed
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
        {
          if (save_image (param[3].data.d_string,
                          image_ID,
                          drawable_ID,
                          orig_image_ID,
                          FALSE))
            {
              /*  Store mvals data  */
              gimp_set_data ("file_jpeg_save", &jsvals, sizeof (JpegSaveVals));
            }
          else
            {
              status = GIMP_PDB_EXECUTION_ERROR;
            }
        }
729

730
      if (export == GIMP_EXPORT_EXPORT)
Sven Neumann's avatar
Sven Neumann committed
731
732
733
        {
          /* If the image was exported, delete the new display. */
          /* This also deletes the image.                       */
734

735
          if (display_ID != -1)
Sven Neumann's avatar
Sven Neumann committed
736
737
738
739
            gimp_display_delete (display_ID);
          else
            gimp_image_delete (image_ID);
        }
Sven Neumann's avatar
Sven Neumann committed
740

741
742
743
      /* pw - now we need to change the defaults to be whatever
       * was used to save this image.  Dump the old parasites
       * and add new ones. */
744

Marc Lehmann's avatar
Marc Lehmann committed
745
      gimp_image_parasite_detach (orig_image_ID, "gimp-comment");
746
      if (image_comment && strlen (image_comment))
Sven Neumann's avatar
Sven Neumann committed
747
748
749
750
751
752
753
754
        {
          parasite = gimp_parasite_new ("gimp-comment",
                                        GIMP_PARASITE_PERSISTENT,
                                        strlen (image_comment) + 1,
                                        image_comment);
          gimp_image_parasite_attach (orig_image_ID, parasite);
          gimp_parasite_free (parasite);
        }
Marc Lehmann's avatar
Marc Lehmann committed
755
      gimp_image_parasite_detach (orig_image_ID, "jpeg-save-options");
756

757
      parasite = gimp_parasite_new ("jpeg-save-options",
Sven Neumann's avatar
Sven Neumann committed
758
                                    0, sizeof (jsvals), &jsvals);
Marc Lehmann's avatar
Marc Lehmann committed
759
      gimp_image_parasite_attach (orig_image_ID, parasite);
760
      gimp_parasite_free (parasite);
Elliot Lee's avatar
Elliot Lee committed
761
    }
762
763
  else
    {
Sven Neumann's avatar
Sven Neumann committed
764
      status = GIMP_PDB_CALLING_ERROR;
765
    }
Elliot Lee's avatar
Elliot Lee committed
766

767
768
  values[0].data.d_status = status;
}
Elliot Lee's avatar
Elliot Lee committed
769

770
/* Read next byte */
771
static guint
772
773
jpeg_getc (j_decompress_ptr cinfo)
{
774
  struct jpeg_source_mgr *datasrc = cinfo->src;
775

776
  if (datasrc->bytes_in_buffer == 0)
Sven Neumann's avatar
Sven Neumann committed
777
778
    {
      if (! (*datasrc->fill_input_buffer) (cinfo))
Sven Neumann's avatar
Sven Neumann committed
779
        ERREXIT (cinfo, JERR_CANT_SUSPEND);
Sven Neumann's avatar
Sven Neumann committed
780
    }
781
  datasrc->bytes_in_buffer--;
782

783
784
785
786
787
788
789
790
791
792
793
794
  return *datasrc->next_input_byte++;
}

/* We need our own marker parser, since early versions of libjpeg
 * don't keep a conventient list of the marker's that have been
 * seen. */

/*
 * Marker processor for COM markers.
 * This replaces the library's built-in processor, which just skips the marker.
 * Note this code relies on a non-suspending data source.
 */
Sven Neumann's avatar
Sven Neumann committed
795
static GString *local_image_comments = NULL;
796
797
798
799

static boolean
COM_handler (j_decompress_ptr cinfo)
{
800
801
  gint  length;
  guint ch;
802
803
804
805
806

  length = jpeg_getc (cinfo) << 8;
  length += jpeg_getc (cinfo);
  if (length < 2)
    return FALSE;
Sven Neumann's avatar
Sven Neumann committed
807
  length -= 2;                  /* discount the length word itself */
808
809
810
811
812
813
814

  if (!local_image_comments)
    local_image_comments = g_string_new (NULL);
  else
    g_string_append_c (local_image_comments, '\n');

  while (length-- > 0)
Sven Neumann's avatar
Sven Neumann committed
815
816
817
818
    {
      ch = jpeg_getc (cinfo);
      g_string_append_c (local_image_comments, ch);
    }
819
820
821
822

  return TRUE;
}

823
824
typedef struct my_error_mgr
{
825
826
827
828
829
830
  struct jpeg_error_mgr pub;            /* "public" fields */

#ifdef __ia64__
  /* Ugh, the jmp_buf field needs to be 16-byte aligned on ia64 and some
   * glibc/icc combinations don't guarantee this. So we pad. See bug #138357
   * for details.
831
   */
832
833
  long double           dummy;
#endif
834

835
  jmp_buf               setjmp_buffer;  /* for return to caller */
Elliot Lee's avatar
Elliot Lee committed
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
} *my_error_ptr;

/*
 * Here's the routine that will replace the standard error_exit method:
 */

static void
my_error_exit (j_common_ptr cinfo)
{
  /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
  my_error_ptr myerr = (my_error_ptr) cinfo->err;

  /* Always display the message. */
  /* We could postpone this until after returning, if we chose. */
  (*cinfo->err->output_message) (cinfo);

  /* Return control to the setjmp point */
  longjmp (myerr->setjmp_buffer, 1);
}

856
857
858
859
860
static void
my_emit_message (j_common_ptr cinfo,
                 int          msg_level)
{
  if (msg_level == -1)
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
    {
      /*  disable loading of EXIF data  */
      cinfo->client_data = GINT_TO_POINTER (TRUE);

      (*cinfo->err->output_message) (cinfo);
    }
}

static void
my_output_message (j_common_ptr cinfo)
{
  gchar  buffer[JMSG_LENGTH_MAX + 1];

  (*cinfo->err->format_message)(cinfo, buffer);

  if (GPOINTER_TO_INT (cinfo->client_data))
    {
      gchar *msg = g_strconcat (buffer,
                                "\n\n",
                                _("EXIF data will be ignored."),
                                NULL);
      g_message (msg);
      g_free (msg);
    }
  else
    {
      g_message (buffer);
    }
889
890
}

Elliot Lee's avatar
Elliot Lee committed
891
static gint32
892
load_image (const gchar *filename,
Sven Neumann's avatar
Sven Neumann committed
893
894
            GimpRunMode  runmode,
            gboolean     preview)
Elliot Lee's avatar
Elliot Lee committed
895
{
896
897
898
899
  GimpPixelRgn     pixel_rgn;
  GimpDrawable    *drawable;
  gint32 volatile  image_ID;
  gint32           layer_ID;
Elliot Lee's avatar
Elliot Lee committed
900
  struct jpeg_decompress_struct cinfo;
901
902
903
904
  struct my_error_mgr           jerr;
  FILE    *infile;
  guchar  *buf;
  guchar  * volatile padded_buf = NULL;
Elliot Lee's avatar
Elliot Lee committed
905
  guchar **rowbuf;
906
907
908
909
910
  gint     image_type;
  gint     layer_type;
  gint     tile_height;
  gint     scanlines;
  gint     i, start, end;
Elliot Lee's avatar
Elliot Lee committed
911

912
  GimpParasite * volatile comment_parasite = NULL;
913

914
915
#ifdef HAVE_EXIF
  GimpParasite *exif_parasite = NULL;
916
  ExifData     *exif_data     = NULL;
917
918
#endif

Elliot Lee's avatar
Elliot Lee committed
919
920
921
922
  /* We set up the normal JPEG error routines. */
  cinfo.err = jpeg_std_error (&jerr.pub);
  jerr.pub.error_exit = my_error_exit;

923
924
925
  /* flag warnings, so we try to ignore corrupt EXIF data */
  if (!preview)
    {
926
927
928
929
      cinfo.client_data = GINT_TO_POINTER (FALSE);

      jerr.pub.emit_message   = my_emit_message;
      jerr.pub.output_message = my_output_message;
930
931
    }

Elliot Lee's avatar
Elliot Lee committed
932
933
  if ((infile = fopen (filename, "rb")) == NULL)
    {
934
      g_message (_("Could not open '%s' for reading: %s"),
935
                 gimp_filename_to_utf8 (filename), g_strerror (errno));
Elliot Lee's avatar
Elliot Lee committed
936
937
938
      gimp_quit ();
    }

939
940
  if (!preview)
    {
941
942
      gchar *name = g_strdup_printf (_("Opening '%s'..."),
                                     gimp_filename_to_utf8 (filename));
943
944
945
946

      gimp_progress_init (name);
      g_free (name);
    }
Elliot Lee's avatar
Elliot Lee committed
947
948
949
950
951
952
953
954
955
956

  image_ID = -1;
  /* Establish the setjmp return context for my_error_exit to use. */
  if (setjmp (jerr.setjmp_buffer))
    {
      /* If we get here, the JPEG code has signaled an error.
       * We need to clean up the JPEG object, close the input file, and return.
       */
      jpeg_destroy_decompress (&cinfo);
      if (infile)
Sven Neumann's avatar
Sven Neumann committed
957
        fclose (infile);
958
      if (image_ID != -1 && !preview)
Sven Neumann's avatar
Sven Neumann committed
959
        gimp_image_delete (image_ID);
960
      if (preview)
Sven Neumann's avatar
Sven Neumann committed
961
        destroy_preview();
Elliot Lee's avatar
Elliot Lee committed
962
963
      gimp_quit ();
    }
964

Elliot Lee's avatar
Elliot Lee committed
965
966
967
968
969
970
971
  /* Now we can initialize the JPEG decompression object. */
  jpeg_create_decompress (&cinfo);

  /* Step 2: specify data source (eg, a file) */

  jpeg_stdio_src (&cinfo, infile);

972
  /* pw - step 2.1 let the lib know we want the comments. */
973
974

  jpeg_set_marker_processor (&cinfo, JPEG_COM, COM_handler);
975

Elliot Lee's avatar
Elliot Lee committed
976
977
978
  /* Step 3: read file parameters with jpeg_read_header() */

  (void) jpeg_read_header (&cinfo, TRUE);
979

Elliot Lee's avatar
Elliot Lee committed
980
981
982
983
984
985
  /* We can ignore the return value from jpeg_read_header since
   *   (a) suspension is not possible with the stdio data source, and
   *   (b) we passed TRUE to reject a tables-only JPEG file as an error.
   * See libjpeg.doc for more info.
   */

986
  if (!preview)
987
988
    {
      /* if we had any comments then make a parasite for them */
989
      if (local_image_comments && local_image_comments->len)
Sven Neumann's avatar
Sven Neumann committed
990
991
        {
          gchar *comment = local_image_comments->str;
992

Sven Neumann's avatar
Sven Neumann committed
993
          g_string_free (local_image_comments, FALSE);
994

Sven Neumann's avatar
Sven Neumann committed
995
          local_image_comments = NULL;
996
997
998
999
1000
1001
1002

          if (g_utf8_validate (comment, -1, NULL))
            comment_parasite = gimp_parasite_new ("gimp-comment",
                                                  GIMP_PARASITE_PERSISTENT,
                                                  strlen (comment) + 1,
                                                  comment);
          g_free (comment);
Sven Neumann's avatar
Sven Neumann committed
1003
        }
1004

1005
1006
1007
      /* Do not attach the "jpeg-save-options" parasite to the image
       * because this conflics with the global defaults.  See bug #75398:
       * http://bugzilla.gnome.org/show_bug.cgi?id=75398 */
1008
1009
    }

Elliot Lee's avatar
Elliot Lee committed
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
  /* Step 4: set parameters for decompression */

  /* In this example, we don't need to change any of the defaults set by
   * jpeg_read_header(), so we do nothing here.
   */

  /* Step 5: Start decompressor */

  jpeg_start_decompress (&cinfo);

  /* We may need to do some setup of our own at this point before reading
   * the data.  After jpeg_start_decompress() we have the correct scaled
   * output image dimensions available, as well as the output colormap
   * if we asked for color quantization.
   * In this example, we need to make an output work buffer of the right size.
   */
  /* temporary buffer */
  tile_height = gimp_tile_height ();
1028
  buf = g_new (guchar,
Sven Neumann's avatar
Sven Neumann committed
1029
               tile_height * cinfo.output_width * cinfo.output_components);
1030

Elliot Lee's avatar
Elliot Lee committed
1031
1032
1033
1034
1035
1036
  rowbuf = g_new (guchar*, tile_height);

  for (i = 0; i < tile_height; i++)
    rowbuf[i] = buf + cinfo.output_width * cinfo.output_components * i;

  /* Create a new image of the proper size and associate the filename with it.
1037
1038
1039

     Preview layers, not being on the bottom of a layer stack, MUST HAVE
     AN ALPHA CHANNEL!
Elliot Lee's avatar
Elliot Lee committed
1040
1041
1042
1043
   */
  switch (cinfo.output_components)
    {
    case 1:
Sven Neumann's avatar
Sven Neumann committed
1044
1045
      image_type = GIMP_GRAY;
      layer_type = preview ? GIMP_GRAYA_IMAGE : GIMP_GRAY_IMAGE;
Elliot Lee's avatar
Elliot Lee committed
1046
      break;
1047

Elliot Lee's avatar
Elliot Lee committed
1048
    case 3:
Sven Neumann's avatar
Sven Neumann committed
1049
1050
      image_type = GIMP_RGB;
      layer_type = preview ? GIMP_RGBA_IMAGE : GIMP_RGB_IMAGE;
Elliot Lee's avatar
Elliot Lee committed
1051
      break;
1052

1053
1054
    case 4:
      if (cinfo.out_color_space == JCS_CMYK)
Sven Neumann's avatar
Sven Neumann committed
1055
1056
1057
1058
1059
        {
          image_type = GIMP_RGB;
          layer_type = GIMP_RGB_IMAGE;
          break;
        }
1060
1061
      /*fallthrough*/

Elliot Lee's avatar
Elliot Lee committed
1062
    default:
1063
1064
1065
      g_message ("Don't know how to load JPEGs\n"
                 "with %d color channels\n"
                 "using colorspace %d (%d)",
Sven Neumann's avatar
Sven Neumann committed
1066
1067
                 cinfo.output_components, cinfo.out_color_space,
                 cinfo.jpeg_color_space);
Elliot Lee's avatar
Elliot Lee committed
1068
      gimp_quit ();
1069
      break;
Elliot Lee's avatar
Elliot Lee committed
1070
1071
    }

1072
1073
  if (preview)
    padded_buf = g_new (guchar, tile_height * cinfo.output_width *
Sven Neumann's avatar
Sven Neumann committed
1074
                        (cinfo.output_components + 1));
1075
1076
1077
1078
1079
  else if (cinfo.out_color_space == JCS_CMYK)
    padded_buf = g_new (guchar, tile_height * cinfo.output_width * 3);
  else
    padded_buf = NULL;

1080
  if (preview)
Sven Neumann's avatar
Sven Neumann committed
1081
1082
    {
      image_ID = image_ID_global;
1083
1084
    }
  else
Sven Neumann's avatar
Sven Neumann committed
1085
    {
1086
      image_ID = gimp_image_new (cinfo.output_width, cinfo.output_height,
Sven Neumann's avatar
Sven Neumann committed
1087
                                 image_type);
Sven Neumann's avatar
Sven Neumann committed
1088
1089
      gimp_image_set_filename (image_ID, filename);
    }
1090

1091
  if (preview)
Sven Neumann's avatar
Sven Neumann committed
1092
    {
1093
      layer_ID_global = layer_ID =
Sven Neumann's avatar
Sven Neumann committed
1094
1095
1096
1097
        gimp_layer_new (image_ID, _("JPEG preview"),
                        cinfo.output_width,
                        cinfo.output_height,
                        layer_type, 100, GIMP_NORMAL_MODE);
1098
    }
1099
  else
Sven Neumann's avatar
Sven Neumann committed
1100
1101
    {
      layer_ID = gimp_layer_new (image_ID, _("Background"),
Sven Neumann's avatar
Sven Neumann committed
1102
1103
1104
                                 cinfo.output_width,
                                 cinfo.output_height,
                                 layer_type, 100, GIMP_NORMAL_MODE);
Sven Neumann's avatar
Sven Neumann committed
1105
    }
Elliot Lee's avatar
Elliot Lee committed
1106

1107
  drawable_global = drawable = gimp_drawable_get (layer_ID);
1108
  gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0,
Sven Neumann's avatar
Sven Neumann committed
1109
                       drawable->width, drawable->height, TRUE, FALSE);
Elliot Lee's avatar
Elliot Lee committed
1110

1111
  /* Step 5.1: if the file had resolution information, set it on the image */
1112
  if (!preview && cinfo.saw_JFIF_marker)
1113
1114
1115
1116
    {
      gdouble xresolution;
      gdouble yresolution;
      gdouble asymmetry;
1117

1118
1119
      xresolution = cinfo.X_density;
      yresolution = cinfo.Y_density;
1120

1121
      switch (cinfo.density_unit)
Sven Neumann's avatar
Sven Neumann committed
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
        {
        case 0: /* unknown -> set the aspect ratio but use the default
                *  image resolution
                */
          if (cinfo.Y_density != 0)
            asymmetry = xresolution / yresolution;
          else
            asymmetry = 1.0;

          gimp_image_get_resolution (image_ID, &xresolution, &yresolution);
          xresolution *= asymmetry;
          break;

        case 1: /* dots per inch */
          break;

        case 2: /* dots per cm */
          xresolution *= 2.54;
          yresolution *= 2.54;
          gimp_image_set_unit (image_ID, GIMP_UNIT_MM);
          break;

        default:
          g_message ("Unknown density unit %d\nassuming dots per inch",
                     cinfo.density_unit);
          break;
        }
1149
1150
1151

      gimp_image_set_resolution (image_ID, xresolution, yresolution);
    }
1152

Elliot Lee's avatar
Elliot Lee committed
1153
1154
1155
1156
1157
1158
1159
1160
1161
  /* Step 6: while (scan lines remain to be read) */
  /*           jpeg_read_scanlines(...); */

  /* Here we use the library's state variable cinfo.output_scanline as the
   * loop counter, so that we don't have to keep track ourselves.
   */
  while (cinfo.output_scanline < cinfo.output_height)
    {
      start = cinfo.output_scanline;
1162
1163
      end   = cinfo.output_scanline + tile_height;
      end   = MIN (end, cinfo.output_height);
Elliot Lee's avatar
Elliot Lee committed
1164
1165
1166
      scanlines = end - start;

      for (i = 0; i < scanlines; i++)
Sven Neumann's avatar
Sven Neumann committed
1167
        jpeg_read_scanlines (&cinfo, (JSAMPARRAY) &rowbuf[i], 1);
Elliot Lee's avatar
Elliot Lee committed
1168

1169
      if (preview) /* Add a dummy alpha channel -- convert buf to padded_buf */
Sven Neumann's avatar
Sven Neumann committed
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
        {
          guchar *dest = padded_buf;
          guchar *src  = buf;
          gint    num  = drawable->width * scanlines;

          switch (cinfo.output_components)
            {
            case 1:
              for (i = 0; i < num; i++)
                {
                  *(dest++) = *(src++);
                  *(dest++) = 255;
                }
              break;

            case 3:
              for (i = 0; i < num; i++)
                {
                  *(dest++) = *(src++);
                  *(dest++) = *(src++);
                  *(dest++) = *(src++);
                  *(dest++) = 255;
                }
              break;

            default:
              g_warning ("JPEG - shouldn't have gotten here.\nReport to http://bugzilla.gnome.org/");
              break;
            }
        }
1200
      else if (cinfo.out_color_space == JCS_CMYK) /* buf-> RGB in padded_buf */
Sven Neumann's avatar
Sven Neumann committed
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
        {
          guchar *dest = padded_buf;
          guchar *src  = buf;
          gint    num  = drawable->width * scanlines;

          for (i = 0; i < num; i++)
            {
              guint r_c, g_m, b_y, a_k;

              r_c = *(src++);
              g_m = *(src++);
              b_y = *(src++);
              a_k = *(src++);
              *(dest++) = (r_c * a_k) / 255;
              *(dest++) = (g_m * a_k) / 255;
              *(dest++) = (b_y * a_k) / 255;
            }
        }
1219
1220

      gimp_pixel_rgn_set_rect (&pixel_rgn, padded_buf ? padded_buf : buf,
Sven Neumann's avatar
Sven Neumann committed
1221
                               0, start, drawable->width, scanlines);
Elliot Lee's avatar
Elliot Lee committed
1222

1223
1224
1225
      if (! preview)
        gimp_progress_update ((gdouble) cinfo.output_scanline /
                              (gdouble) cinfo.output_height);
Elliot Lee's avatar
Elliot Lee committed
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
    }

  /* Step 7: Finish decompression */

  jpeg_finish_decompress (&cinfo);
  /* We can ignore the return value since suspension is not possible
   * with the stdio data source.
   */

  /* Step 8: Release JPEG decompression object */

  /* This is an important step since it will release a good deal of memory. */
  jpeg_destroy_decompress (&cinfo);

  /* free up the temporary buffers */
  g_free (rowbuf);
  g_free (buf);
1243
  g_free (padded_buf);
Elliot Lee's avatar
Elliot Lee committed
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257

  /* After finish_decompress, we can close the input file.
   * Here we postpone it until after no more JPEG errors are possible,
   * so as to simplify the setjmp error logic above.  (Actually, I don't
   * think that jpeg_destroy can do an error exit, but why assume anything...)
   */
  fclose (infile);

  /* At this point you may want to check to see whether any corrupt-data
   * warnings occurred (test whether jerr.num_warnings is nonzero).
   */

  /* Tell the GIMP to display the image.
   */
BST 1999 Andy Thomas's avatar
BST 1999 Andy Thomas committed
1258
  gimp_image_add_layer (image_ID, layer_ID, 0);
Elliot Lee's avatar
Elliot Lee committed
1259
1260
  gimp_drawable_flush (drawable);

1261
1262
  /* pw - Last of all, attach the parasites (couldn't do it earlier -
     there was no image. */
Sven Neumann's avatar
Sven Neumann committed
1263

1264
  if (!preview)
Sven Neumann's avatar
Sven Neumann committed
1265
1266
    {
      if (comment_parasite)
Sven Neumann's avatar
Sven Neumann committed
1267
1268
1269
        {
          gimp_image_parasite_attach (image_ID, comment_parasite);
          gimp_parasite_free (comment_parasite);
1270
1271

          comment_parasite = NULL;
Sven Neumann's avatar
Sven Neumann committed
1272
        }
1273
1274

#ifdef HAVE_EXIF
1275
1276
#define EXIF_HEADER_SIZE 8

1277
      if (! GPOINTER_TO_INT (cinfo.client_data))
Sven Neumann's avatar
Sven Neumann committed
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288