summaryrefslogtreecommitdiff
path: root/src/eom-image-jpeg.c
blob: 576df36b07cc6ff3deb4f6b17d500d54bb47811c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
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
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
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
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
/* This code is based on the jpeg saving code from gdk-pixbuf. Full copyright
 * notice is given in the following:
 */
/* GdkPixbuf library - JPEG image loader
 *
 * Copyright (C) 1999 Michael Zucchi
 * Copyright (C) 1999 The Free Software Foundation
 *
 * Progressive loading code Copyright (C) 1999 Red Hat, Inc.
 *
 * Authors: Michael Zucchi <zucchi@zedzone.mmc.com.au>
 *          Federico Mena-Quintero <federico@gimp.org>
 *          Michael Fulbright <drmike@redhat.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "eom-image-jpeg.h"
#include "eom-image-private.h"

#if HAVE_JPEG

#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <jpeglib.h>
#include <jerror.h>
#include "transupp.h"
#include <glib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <glib/gi18n.h>
#if HAVE_EXIF
#include <libexif/exif-data.h>
#endif

#ifdef G_OS_WIN32
#define sigjmp_buf jmp_buf
#define sigsetjmp(env, savesigs) setjmp (env)
#define siglongjmp longjmp
#endif

typedef enum {
	EOM_SAVE_NONE,
	EOM_SAVE_JPEG_AS_JPEG,
	EOM_SAVE_ANY_AS_JPEG
} EomJpegSaveMethod;

/* error handler data */
struct error_handler_data {
	struct jpeg_error_mgr pub;
	sigjmp_buf setjmp_buffer;
        GError **error;
	char *filename;
};


static void
fatal_error_handler (j_common_ptr cinfo)
{
	struct error_handler_data *errmgr;
        char buffer[JMSG_LENGTH_MAX];

	errmgr = (struct error_handler_data *) cinfo->err;

        /* Create the message */
        (* cinfo->err->format_message) (cinfo, buffer);

        /* broken check for *error == NULL for robustness against
         * crappy JPEG library
         */
        if (errmgr->error && *errmgr->error == NULL) {
                g_set_error (errmgr->error,
			     0,
			     0,
			     "Error interpreting JPEG image file: %s\n\n%s",
			     g_path_get_basename (errmgr->filename),
                             buffer);
        }

	siglongjmp (errmgr->setjmp_buffer, 1);

        g_assert_not_reached ();
}


static void
output_message_handler (j_common_ptr cinfo)
{
	/* This method keeps libjpeg from dumping crap to stderr */
	/* do nothing */
}

static void
init_transform_info (EomImage *image, jpeg_transform_info *info)
{
	EomImagePrivate *priv;
	EomTransform *composition = NULL;
	EomTransformType transformation;
	JXFORM_CODE trans_code = JXFORM_NONE;

	g_return_if_fail (EOM_IS_IMAGE (image));

	priv = image->priv;

	if (priv->trans != NULL && priv->trans_autorotate != NULL) {
		composition = eom_transform_compose (priv->trans,
						     priv->trans_autorotate);
	} else if (priv->trans != NULL) {
		composition = g_object_ref (priv->trans);
	} else if (priv->trans_autorotate != NULL) {
		composition = g_object_ref (priv->trans_autorotate);
	}

	if (composition != NULL) {
		transformation = eom_transform_get_transform_type (composition);

		switch (transformation) {
		case EOM_TRANSFORM_ROT_90:
			trans_code = JXFORM_ROT_90;
			break;
		case EOM_TRANSFORM_ROT_270:
			trans_code = JXFORM_ROT_270;
			break;
		case EOM_TRANSFORM_ROT_180:
			trans_code = JXFORM_ROT_180;
			break;
		case EOM_TRANSFORM_FLIP_HORIZONTAL:
			trans_code = JXFORM_FLIP_H;
			break;
		case EOM_TRANSFORM_FLIP_VERTICAL:
			trans_code = JXFORM_FLIP_V;
			break;
		case EOM_TRANSFORM_TRANSPOSE:
			trans_code = JXFORM_TRANSPOSE;
			break;
		case EOM_TRANSFORM_TRANSVERSE:
			trans_code = JXFORM_TRANSVERSE;
			break;
		default:
			g_warning("EomTransformType not supported!");
			/* Fallthrough intended here. */
		case EOM_TRANSFORM_NONE:
			trans_code = JXFORM_NONE;
			break;
		}
	}

	info->transform = trans_code;
	info->trim      = FALSE;
#if JPEG_LIB_VERSION >= 80
	info->crop = FALSE;
#endif
	info->force_grayscale = FALSE;

	g_object_unref (composition);
}

static gboolean
_save_jpeg_as_jpeg (EomImage *image, const char *file, EomImageSaveInfo *source,
		    EomImageSaveInfo *target, GError **error)
{
	struct jpeg_decompress_struct  srcinfo;
	struct jpeg_compress_struct    dstinfo;
	struct error_handler_data      jsrcerr, jdsterr;
	jpeg_transform_info            transformoption;
	jvirt_barray_ptr              *src_coef_arrays;
	jvirt_barray_ptr              *dst_coef_arrays;
	FILE                          *output_file;
	FILE                          *input_file;
	EomImagePrivate               *priv;
	gchar                          *infile_uri;

	g_return_val_if_fail (EOM_IS_IMAGE (image), FALSE);
	g_return_val_if_fail (EOM_IMAGE (image)->priv->file != NULL, FALSE);

	priv = image->priv;

	init_transform_info (image, &transformoption);

	/* Initialize the JPEG decompression object with default error
	 * handling. */
	jsrcerr.filename = g_file_get_path (priv->file);
	srcinfo.err = jpeg_std_error (&(jsrcerr.pub));
	jsrcerr.pub.error_exit = fatal_error_handler;
	jsrcerr.pub.output_message = output_message_handler;
	jsrcerr.error = error;

	jpeg_create_decompress (&srcinfo);

	/* Initialize the JPEG compression object with default error
	 * handling. */
	jdsterr.filename = (char *) file;
	dstinfo.err = jpeg_std_error (&(jdsterr.pub));
	jdsterr.pub.error_exit = fatal_error_handler;
	jdsterr.pub.output_message = output_message_handler;
	jdsterr.error = error;

	jpeg_create_compress (&dstinfo);

	dstinfo.err->trace_level = 0;
	dstinfo.arith_code = FALSE;
	dstinfo.optimize_coding = FALSE;

	jsrcerr.pub.trace_level = jdsterr.pub.trace_level;
	srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;

	/* Open the output file. */
	/* FIXME: Make this a GIO aware input manager */
	infile_uri = g_file_get_path (priv->file);
	input_file = fopen (infile_uri, "rb");
	if (input_file == NULL) {
		g_warning ("Input file not openable: %s\n", infile_uri);
		g_free (jsrcerr.filename);
		g_free (infile_uri);
		return FALSE;
	}
	g_free (infile_uri);

	output_file = fopen (file, "wb");
	if (output_file == NULL) {
		g_warning ("Output file not openable: %s\n", file);
		fclose (input_file);
		g_free (jsrcerr.filename);
		return FALSE;
	}

	if (sigsetjmp (jsrcerr.setjmp_buffer, 1)) {
		fclose (output_file);
		fclose (input_file);
		jpeg_destroy_compress (&dstinfo);
		jpeg_destroy_decompress (&srcinfo);
		g_free (jsrcerr.filename);
		return FALSE;
	}

	if (sigsetjmp (jdsterr.setjmp_buffer, 1)) {
		fclose (output_file);
		fclose (input_file);
		jpeg_destroy_compress (&dstinfo);
		jpeg_destroy_decompress (&srcinfo);
		g_free (jsrcerr.filename);
		return FALSE;
	}

	/* Specify data source for decompression */
	jpeg_stdio_src (&srcinfo, input_file);

	/* Enable saving of extra markers that we want to copy */
	jcopy_markers_setup (&srcinfo, JCOPYOPT_DEFAULT);

	/* Read file header */
	(void) jpeg_read_header (&srcinfo, TRUE);

	/* Any space needed by a transform option must be requested before
	 * jpeg_read_coefficients so that memory allocation will be done right.
	 */
	jtransform_request_workspace (&srcinfo, &transformoption);

	/* Read source file as DCT coefficients */
	src_coef_arrays = jpeg_read_coefficients (&srcinfo);

	/* Initialize destination compression parameters from source values */
	jpeg_copy_critical_parameters (&srcinfo, &dstinfo);

	/* Adjust destination parameters if required by transform options;
	 * also find out which set of coefficient arrays will hold the output.
	 */
	dst_coef_arrays = jtransform_adjust_parameters (&srcinfo,
							&dstinfo,
							src_coef_arrays,
							&transformoption);

	/* Specify data destination for compression */
	jpeg_stdio_dest (&dstinfo, output_file);

	/* Start compressor (note no image data is actually written here) */
	jpeg_write_coefficients (&dstinfo, dst_coef_arrays);

	/* handle EXIF/IPTC data explicitly */
#if HAVE_EXIF
	/* exif_chunk and exif are mutally exclusvie, this is what we assure here */
	g_assert (priv->exif_chunk == NULL);
	if (priv->exif != NULL)
	{
		unsigned char *exif_buf;
		unsigned int   exif_buf_len;

		exif_data_save_data (priv->exif, &exif_buf, &exif_buf_len);
		jpeg_write_marker (&dstinfo, JPEG_APP0+1, exif_buf, exif_buf_len);
		g_free (exif_buf);
	}
#else
	if (priv->exif_chunk != NULL) {
		jpeg_write_marker (&dstinfo, JPEG_APP0+1, priv->exif_chunk, priv->exif_chunk_len);
	}
#endif
	/* FIXME: Consider IPTC data too */

	/* Copy to the output file any extra markers that we want to
	 * preserve */
	jcopy_markers_execute (&srcinfo, &dstinfo, JCOPYOPT_DEFAULT);

	/* Execute image transformation, if any */
	jtransform_execute_transformation (&srcinfo,
					   &dstinfo,
					   src_coef_arrays,
					   &transformoption);

	/* Finish compression and release memory */
	jpeg_finish_compress (&dstinfo);
	jpeg_destroy_compress (&dstinfo);
	(void) jpeg_finish_decompress (&srcinfo);
	jpeg_destroy_decompress (&srcinfo);
	g_free (jsrcerr.filename);

	/* Close files */
	fclose (input_file);
	fclose (output_file);

	return TRUE;
}

static gboolean
_save_any_as_jpeg (EomImage *image, const char *file, EomImageSaveInfo *source,
		   EomImageSaveInfo *target, GError **error)
{
	EomImagePrivate *priv;
	GdkPixbuf *pixbuf;
	struct jpeg_compress_struct cinfo;
	guchar *buf = NULL;
	guchar *ptr;
	guchar *pixels = NULL;
	JSAMPROW *jbuf;
	int y = 0;
	volatile int quality = 75; /* default; must be between 0 and 100 */
	int i, j;
	int w, h = 0;
	int rowstride = 0;
	FILE *outfile;
	struct error_handler_data jerr;

	g_return_val_if_fail (EOM_IS_IMAGE (image), FALSE);
	g_return_val_if_fail (EOM_IMAGE (image)->priv->image != NULL, FALSE);

	priv = image->priv;
	pixbuf = priv->image;

	rowstride = gdk_pixbuf_get_rowstride (pixbuf);
	w = gdk_pixbuf_get_width (pixbuf);
	h = gdk_pixbuf_get_height (pixbuf);

	/* no image data? abort */
	pixels = gdk_pixbuf_get_pixels (pixbuf);
	g_return_val_if_fail (pixels != NULL, FALSE);

	outfile = fopen (file, "wb");
	if (outfile == NULL) {
		g_set_error (error,             /* FIXME: Better error message */
			     GDK_PIXBUF_ERROR,
			     GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
			     _("Couldn't create temporary file for saving: %s"),
			     file);
		return FALSE;
	}

	/* allocate a small buffer to convert image data */
	buf = g_try_malloc (w * 3 * sizeof (guchar));
	if (!buf) {
		g_set_error (error,
			     GDK_PIXBUF_ERROR,
			     GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
			     _("Couldn't allocate memory for loading JPEG file"));
		fclose (outfile);
		return FALSE;
	}

	/* set up error handling */
	jerr.filename = (char *) file;
	cinfo.err = jpeg_std_error (&(jerr.pub));
	jerr.pub.error_exit = fatal_error_handler;
	jerr.pub.output_message = output_message_handler;
	jerr.error = error;

	/* setup compress params */
	jpeg_create_compress (&cinfo);
	jpeg_stdio_dest (&cinfo, outfile);
	cinfo.image_width      = w;
	cinfo.image_height     = h;
	cinfo.input_components = 3;
	cinfo.in_color_space   = JCS_RGB;

	/* error exit routine */
	if (sigsetjmp (jerr.setjmp_buffer, 1)) {
		g_free (buf);
		fclose (outfile);
		jpeg_destroy_compress (&cinfo);
		return FALSE;
	}

	/* set desired jpeg quality if available */
	if (target != NULL && target->jpeg_quality >= 0.0) {
		quality = (int) MIN (target->jpeg_quality, 1.0) * 100;
	}

	/* set up jepg compression parameters */
	jpeg_set_defaults (&cinfo);
	jpeg_set_quality (&cinfo, quality, TRUE);
	jpeg_start_compress (&cinfo, TRUE);

	/* write EXIF/IPTC data explicitly */
#if HAVE_EXIF
	/* exif_chunk and exif are mutally exclusvie, this is what we assure here */
	g_assert (priv->exif_chunk == NULL);
	if (priv->exif != NULL)
	{
		unsigned char *exif_buf;
		unsigned int   exif_buf_len;

		exif_data_save_data (priv->exif, &exif_buf, &exif_buf_len);
		jpeg_write_marker (&cinfo, 0xe1, exif_buf, exif_buf_len);
		g_free (exif_buf);
	}
#else
	if (priv->exif_chunk != NULL) {
		jpeg_write_marker (&cinfo, JPEG_APP0+1, priv->exif_chunk, priv->exif_chunk_len);
	}
#endif
	/* FIXME: Consider IPTC data too */

	/* get the start pointer */
	ptr = pixels;
	/* go one scanline at a time... and save */
	i = 0;
	while (cinfo.next_scanline < cinfo.image_height) {
		/* convert scanline from ARGB to RGB packed */
		for (j = 0; j < w; j++)
			memcpy (&(buf[j*3]), &(ptr[i*rowstride + j*(rowstride/w)]), 3);

		/* write scanline */
		jbuf = (JSAMPROW *)(&buf);
		jpeg_write_scanlines (&cinfo, jbuf, 1);
		i++;
		y++;

	}

	/* finish off */
	jpeg_finish_compress (&cinfo);
	jpeg_destroy_compress(&cinfo);
	g_free (buf);

	fclose (outfile);

	return TRUE;
}

gboolean
eom_image_jpeg_save_file (EomImage *image, const char *file,
			  EomImageSaveInfo *source, EomImageSaveInfo *target,
			  GError **error)
{
	EomJpegSaveMethod method = EOM_SAVE_NONE;
	gboolean source_is_jpeg = FALSE;
	gboolean target_is_jpeg = FALSE;
        gboolean result;

	g_return_val_if_fail (source != NULL, FALSE);

	source_is_jpeg = !g_ascii_strcasecmp (source->format, EOM_FILE_FORMAT_JPEG);

	/* determine which method should be used for saving */
	if (target == NULL) {
		if (source_is_jpeg) {
			method = EOM_SAVE_JPEG_AS_JPEG;
		}
	}
	else {
		target_is_jpeg = !g_ascii_strcasecmp (target->format, EOM_FILE_FORMAT_JPEG);

		if (source_is_jpeg && target_is_jpeg) {
			if (target->jpeg_quality < 0.0) {
				method = EOM_SAVE_JPEG_AS_JPEG;
			}
			else {
				/* reencoding is required, cause quality is set */
				method = EOM_SAVE_ANY_AS_JPEG;
			}
		}
		else if (!source_is_jpeg && target_is_jpeg) {
			method = EOM_SAVE_ANY_AS_JPEG;
		}
	}

	switch (method) {
	case EOM_SAVE_JPEG_AS_JPEG:
		result = _save_jpeg_as_jpeg (image, file, source, target, error);
		break;
	case EOM_SAVE_ANY_AS_JPEG:
		result = _save_any_as_jpeg (image, file, source, target, error);
		break;
	default:
		result = FALSE;
	}

	return result;
}
#endif