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
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
|
//
// fiv-thumbnail.c: thumbnail management
//
// Copyright (c) 2021 - 2022, Přemysl Eric Janouch <p@janouch.name>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
#include "config.h"
#include <glib/gstdio.h>
#include <webp/demux.h>
#include <webp/encode.h>
#include <webp/mux.h>
#include <errno.h>
#include <math.h>
#include <stdbool.h>
#include "fiv-io.h"
#include "fiv-thumbnail.h"
#include "xdg.h"
#ifdef HAVE_LIBRAW
#include <libraw.h>
#endif // HAVE_LIBRAW
// TODO(p): Consider merging back with fiv-io.
#define FIV_THUMBNAIL_ERROR fiv_thumbnail_error_quark()
G_DEFINE_QUARK(fiv-thumbnail-error-quark, fiv_thumbnail_error)
enum FivThumbnailError {
FIV_THUMBNAIL_ERROR_IO
};
static void
set_error(GError **error, const char *message)
{
g_set_error_literal(
error, FIV_THUMBNAIL_ERROR, FIV_THUMBNAIL_ERROR_IO, message);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
GType
fiv_thumbnail_size_get_type(void)
{
static gsize guard;
if (g_once_init_enter(&guard)) {
#define XX(name, value, dir) {FIV_THUMBNAIL_SIZE_ ## name, \
"FIV_THUMBNAIL_SIZE_" #name, #name},
static const GEnumValue values[] = {FIV_THUMBNAIL_SIZES(XX) {}};
#undef XX
GType type = g_enum_register_static(
g_intern_static_string("FivThumbnailSize"), values);
g_once_init_leave(&guard, type);
}
return guard;
}
#define XX(name, value, dir) {value, dir},
FivThumbnailSizeInfo
fiv_thumbnail_sizes[FIV_THUMBNAIL_SIZE_COUNT] = {
FIV_THUMBNAIL_SIZES(XX)};
#undef XX
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#define THUMB_URI "Thumb::URI"
#define THUMB_MTIME "Thumb::MTime"
#define THUMB_SIZE "Thumb::Size"
#define THUMB_IMAGE_WIDTH "Thumb::Image::Width"
#define THUMB_IMAGE_HEIGHT "Thumb::Image::Height"
#define THUMB_COLORSPACE "Thumb::ColorSpace"
#define THUMB_COLORSPACE_SRGB "sRGB"
cairo_user_data_key_t fiv_thumbnail_key_lq;
static void
mark_thumbnail_lq(cairo_surface_t *surface)
{
cairo_surface_set_user_data(
surface, &fiv_thumbnail_key_lq, (void *) (intptr_t) 1, NULL);
}
gchar *
fiv_thumbnail_get_root(void)
{
gchar *cache_dir = get_xdg_home_dir("XDG_CACHE_HOME", ".cache");
gchar *thumbnails_dir = g_build_filename(cache_dir, "thumbnails", NULL);
g_free(cache_dir);
return thumbnails_dir;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static cairo_surface_t *
render(GFile *target, GBytes *data, gboolean *color_managed, GError **error)
{
FivIoOpenContext ctx = {
.uri = g_file_get_uri(target),
.screen_profile = fiv_io_profile_new_sRGB(),
.screen_dpi = 96,
.first_frame_only = TRUE,
// Only using this array as a redirect.
.warnings = g_ptr_array_new_with_free_func(g_free),
};
cairo_surface_t *surface = fiv_io_open_from_data(
g_bytes_get_data(data, NULL), g_bytes_get_size(data), &ctx, error);
g_free((gchar *) ctx.uri);
g_ptr_array_free(ctx.warnings, TRUE);
if ((*color_managed = !!ctx.screen_profile))
fiv_io_profile_free(ctx.screen_profile);
g_bytes_unref(data);
return surface;
}
// In principle similar to rescale_thumbnail() from fiv-browser.c.
static cairo_surface_t *
adjust_thumbnail(cairo_surface_t *thumbnail, double row_height)
{
// Hardcode orientation.
FivIoOrientation orientation = (uintptr_t) cairo_surface_get_user_data(
thumbnail, &fiv_io_key_orientation);
double w = 0, h = 0;
cairo_matrix_t matrix =
fiv_io_orientation_apply(thumbnail, orientation, &w, &h);
double scale_x = 1;
double scale_y = 1;
if (w > FIV_THUMBNAIL_WIDE_COEFFICIENT * h) {
scale_x = FIV_THUMBNAIL_WIDE_COEFFICIENT * row_height / w;
scale_y = round(scale_x * h) / h;
} else {
scale_y = row_height / h;
scale_x = round(scale_y * w) / w;
}
// Vector images should not have orientation, this should handle them all.
FivIoRenderClosure *closure =
cairo_surface_get_user_data(thumbnail, &fiv_io_key_render);
if (closure && orientation <= FivIoOrientation0) {
// This API doesn't accept non-uniform scaling; prefer a vertical fit.
cairo_surface_t *scaled = closure->render(closure, scale_y);
if (scaled)
return scaled;
}
// This will be CAIRO_FORMAT_INVALID with non-image surfaces, which is fine.
cairo_format_t format = cairo_image_surface_get_format(thumbnail);
if (format != CAIRO_FORMAT_INVALID &&
orientation <= FivIoOrientation0 && scale_x == 1 && scale_y == 1)
return cairo_surface_reference(thumbnail);
int projected_width = round(scale_x * w);
int projected_height = round(scale_y * h);
cairo_surface_t *scaled = cairo_image_surface_create(
(format == CAIRO_FORMAT_RGB24 || format == CAIRO_FORMAT_RGB30)
? CAIRO_FORMAT_RGB24
: CAIRO_FORMAT_ARGB32,
projected_width, projected_height);
cairo_t *cr = cairo_create(scaled);
cairo_scale(cr, scale_x, scale_y);
cairo_set_source_surface(cr, thumbnail, 0, 0);
cairo_pattern_t *pattern = cairo_get_source(cr);
// CAIRO_FILTER_BEST, for some reason, works bad with CAIRO_FORMAT_RGB30.
cairo_pattern_set_filter(pattern, CAIRO_FILTER_GOOD);
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_PAD);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_paint(cr);
// Note that this doesn't get triggered with oversize input surfaces,
// even though nothing will be rendered.
if (cairo_surface_status(thumbnail) != CAIRO_STATUS_SUCCESS ||
cairo_surface_status(scaled) != CAIRO_STATUS_SUCCESS ||
cairo_pattern_status(pattern) != CAIRO_STATUS_SUCCESS ||
cairo_status(cr) != CAIRO_STATUS_SUCCESS)
g_warning("thumbnail scaling failed");
cairo_destroy(cr);
return scaled;
}
static cairo_surface_t *
orient_thumbnail(cairo_surface_t *surface, FivIoOrientation orientation)
{
if (!surface || orientation <= FivIoOrientation0)
return surface;
double w = 0, h = 0;
cairo_matrix_t matrix =
fiv_io_orientation_apply(surface, orientation, &w, &h);
cairo_surface_t *oriented =
cairo_image_surface_create(CAIRO_FORMAT_RGB24, w, h);
cairo_t *cr = cairo_create(oriented);
cairo_set_source_surface(cr, surface, 0, 0);
cairo_pattern_set_matrix(cairo_get_source(cr), &matrix);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_paint(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);
return oriented;
}
cairo_surface_t *
fiv_thumbnail_extract(GFile *target, FivThumbnailSize max_size, GError **error)
{
const char *path = g_file_peek_path(target);
if (!path) {
set_error(error, "thumbnails will only be extracted from local files");
return NULL;
}
GMappedFile *mf = g_mapped_file_new(path, FALSE, error);
if (!mf)
return NULL;
// Bitmap thumbnails generally need rotating, e.g.:
// - Hasselblad/H4D-50/2-9-2017_street_0012.fff
// - OnePlus/One/IMG_20150729_201116.dng (and more DNGs in general)
// Though it's apparent LibRaw doesn't adjust the thumbnails to match
// the main image's "flip" field (it just happens to match up often), e.g.:
// - Phase One/H 25/H25_Outdoor_.IIQ (correct Orientation in IFD0)
// - Phase One/H 25/H25_IT8.7-2_Card.TIF (correctly missing in IFD0)
//
// JPEG thumbnails generally have the right rotation in their Exif, e.g.:
// - Canon/EOS-1Ds Mark II/RAW_CANON_1DSM2.CR2
// - Leica/C (Typ 112)/Leica_-_C_(Typ_112)-_3:2.RWL
// - Nikon/1 S2/RAW_NIKON_1S2.NEF
// - Panasonic/DMC-FZ18/RAW_PANASONIC_LUMIX_FZ18.RAW
// - Panasonic/DMC-FZ70/P1000836.RW2
// - Samsung/NX200/2013-05-08-194524__sam6589.srw
// - Sony/DSC-HX95/DSC00018.ARW
//
// Some files are problematic and we won't bother with special-casing:
// - Leaf/Aptus 22/L_003172.mos (JPEG)'s thumbnail wrongly contains
// Exif Orientation 6, and sizes.flip also contains 6.
// - Nokia/Lumia 1020/RAW_NOKIA_LUMIA_1020.DNG (bitmap) has wrong color.
// - Ricoh/GXR/R0017428.DNG (JPEG) seems to be plainly invalid.
FivIoOrientation orientation = FivIoOrientationUnknown;
cairo_surface_t *surface = NULL;
#ifndef HAVE_LIBRAW
// TODO(p): Implement our own thumbnail extractors.
set_error(error, "unsupported file");
#else // HAVE_LIBRAW
libraw_data_t *iprc = libraw_init(
LIBRAW_OPIONS_NO_MEMERR_CALLBACK | LIBRAW_OPIONS_NO_DATAERR_CALLBACK);
if (!iprc) {
set_error(error, "failed to obtain a LibRaw handle");
goto fail;
}
int err = 0;
if ((err = libraw_open_buffer(iprc, (void *) g_mapped_file_get_contents(mf),
g_mapped_file_get_length(mf))) ||
(err = libraw_unpack_thumb(iprc))) {
set_error(error, libraw_strerror(err));
goto fail_libraw;
}
libraw_processed_image_t *image = libraw_dcraw_make_mem_thumb(iprc, &err);
if (!image) {
set_error(error, libraw_strerror(err));
goto fail_libraw;
}
gboolean dummy = FALSE;
switch (image->type) {
case LIBRAW_IMAGE_JPEG:
surface = render(
target, g_bytes_new(image->data, image->data_size), &dummy, error);
orientation = (int) (intptr_t) cairo_surface_get_user_data(
surface, &fiv_io_key_orientation);
break;
case LIBRAW_IMAGE_BITMAP:
// Anything else is extremely rare.
if (image->colors != 3 || image->bits != 8) {
set_error(error, "unsupported bitmap thumbnail");
break;
}
surface = cairo_image_surface_create(
CAIRO_FORMAT_RGB24, image->width, image->height);
guint32 *out = (guint32 *) cairo_image_surface_get_data(surface);
const unsigned char *in = image->data;
for (guint64 i = 0; i < image->width * image->height; in += 3)
out[i++] = in[0] << 16 | in[1] << 8 | in[2];
cairo_surface_mark_dirty(surface);
// LibRaw actually turns an 8 to 5, so follow the documentation.
switch (iprc->sizes.flip) {
break; case 3: orientation = FivIoOrientation180;
break; case 5: orientation = FivIoOrientation270;
break; case 6: orientation = FivIoOrientation90;
}
break;
default:
set_error(error, "unsupported embedded thumbnail");
}
libraw_dcraw_clear_mem(image);
fail_libraw:
libraw_close(iprc);
#endif // HAVE_LIBRAW
fail:
g_mapped_file_unref(mf);
// This hardcodes Exif orientation before adjust_thumbnail() might do so,
// before the early return below.
surface = orient_thumbnail(surface, orientation);
if (!surface || max_size < FIV_THUMBNAIL_SIZE_MIN ||
max_size > FIV_THUMBNAIL_SIZE_MAX)
return surface;
cairo_surface_t *result =
adjust_thumbnail(surface, fiv_thumbnail_sizes[max_size].size);
cairo_surface_destroy(surface);
return result;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static WebPData
encode_thumbnail(cairo_surface_t *surface)
{
WebPData bitstream = {};
WebPConfig config = {};
if (!WebPConfigInit(&config) || !WebPConfigLosslessPreset(&config, 6))
return bitstream;
config.near_lossless = 95;
config.thread_level = true;
if (!WebPValidateConfig(&config))
return bitstream;
bitstream.bytes = fiv_io_encode_webp(surface, &config, &bitstream.size);
return bitstream;
}
static void
save_thumbnail(cairo_surface_t *thumbnail, const char *path, GString *thum)
{
WebPMux *mux = WebPMuxNew();
WebPData bitstream = encode_thumbnail(thumbnail);
gboolean ok = WebPMuxSetImage(mux, &bitstream, true) == WEBP_MUX_OK;
WebPDataClear(&bitstream);
WebPData data = {.bytes = (const uint8_t *) thum->str, .size = thum->len};
ok = ok && WebPMuxSetChunk(mux, "THUM", &data, false) == WEBP_MUX_OK;
WebPData assembled = {};
WebPDataInit(&assembled);
ok = ok && WebPMuxAssemble(mux, &assembled) == WEBP_MUX_OK;
WebPMuxDelete(mux);
if (!ok) {
g_warning("thumbnail encoding failed");
return;
}
GError *e = NULL;
while (!g_file_set_contents(
path, (const gchar *) assembled.bytes, assembled.size, &e)) {
bool missing_parents =
e->domain == G_FILE_ERROR && e->code == G_FILE_ERROR_NOENT;
g_debug("%s: %s", path, e->message);
g_clear_error(&e);
if (!missing_parents)
break;
gchar *dirname = g_path_get_dirname(path);
int err = g_mkdir_with_parents(dirname, 0755);
if (err)
g_debug("%s: %s", dirname, g_strerror(errno));
g_free(dirname);
if (err)
break;
}
// It would be possible to create square thumbnails as well,
// but it seems like wasted effort.
WebPDataClear(&assembled);
}
static cairo_surface_t *
produce_fallback(GFile *target, FivThumbnailSize size, GError **error)
{
goffset filesize = 0;
GFileInfo *info = g_file_query_info(target,
G_FILE_ATTRIBUTE_STANDARD_NAME "," G_FILE_ATTRIBUTE_STANDARD_SIZE,
G_FILE_QUERY_INFO_NONE, NULL, NULL);
if (info) {
filesize = g_file_info_get_size(info);
g_object_unref(info);
}
// TODO(p): Try to be a bit more intelligent about this.
// For example, we can employ magic checks.
if (filesize > 10 << 20) {
set_error(error, "oversize, not thumbnailing");
return NULL;
}
GBytes *data = g_file_load_bytes(target, NULL, NULL, error);
if (!data)
return NULL;
gboolean color_managed = FALSE;
cairo_surface_t *surface = render(target, data, &color_managed, error);
if (!surface)
return NULL;
cairo_surface_t *result =
adjust_thumbnail(surface, fiv_thumbnail_sizes[size].size);
cairo_surface_destroy(surface);
return result;
}
cairo_surface_t *
fiv_thumbnail_produce(GFile *target, FivThumbnailSize max_size, GError **error)
{
g_return_val_if_fail(max_size >= FIV_THUMBNAIL_SIZE_MIN &&
max_size <= FIV_THUMBNAIL_SIZE_MAX, FALSE);
const gchar *path = g_file_peek_path(target);
if (!path || !g_file_is_native(target) /* Don't save sftp://. */)
return produce_fallback(target, max_size, error);
// Make the TOCTTOU issue favour unnecessary reloading.
GStatBuf st = {};
if (g_stat(path, &st)) {
set_error(error, g_strerror(errno));
return NULL;
}
GError *e = NULL;
GMappedFile *mf = g_mapped_file_new(path, FALSE, &e);
if (!mf) {
g_debug("%s: %s", path, e->message);
g_error_free(e);
return produce_fallback(target, max_size, error);
}
gsize filesize = g_mapped_file_get_length(mf);
gboolean color_managed = FALSE;
cairo_surface_t *surface =
render(target, g_mapped_file_get_bytes(mf), &color_managed, error);
g_mapped_file_unref(mf);
if (!surface)
return NULL;
// Boilerplate copied from fiv_thumbnail_lookup().
gchar *uri = g_file_get_uri(target);
gchar *sum = g_compute_checksum_for_string(G_CHECKSUM_MD5, uri, -1);
gchar *thumbnails_dir = fiv_thumbnail_get_root();
GString *thum = g_string_new("");
g_string_append_printf(
thum, "%s%c%s%c", THUMB_URI, 0, uri, 0);
g_string_append_printf(
thum, "%s%c%ld%c", THUMB_MTIME, 0, (long) st.st_mtime, 0);
g_string_append_printf(
thum, "%s%c%ld%c", THUMB_SIZE, 0, (long) filesize, 0);
if (cairo_surface_get_type(surface) == CAIRO_SURFACE_TYPE_IMAGE) {
g_string_append_printf(thum, "%s%c%d%c", THUMB_IMAGE_WIDTH, 0,
cairo_image_surface_get_width(surface), 0);
g_string_append_printf(thum, "%s%c%d%c", THUMB_IMAGE_HEIGHT, 0,
cairo_image_surface_get_height(surface), 0);
}
// Without a CMM, no conversion is attempted.
if (color_managed) {
g_string_append_printf(
thum, "%s%c%s%c", THUMB_COLORSPACE, 0, THUMB_COLORSPACE_SRGB, 0);
}
cairo_surface_t *max_size_surface = NULL;
for (int use = max_size; use >= FIV_THUMBNAIL_SIZE_MIN; use--) {
cairo_surface_t *scaled =
adjust_thumbnail(surface, fiv_thumbnail_sizes[use].size);
gchar *path = g_strdup_printf("%s/wide-%s/%s.webp", thumbnails_dir,
fiv_thumbnail_sizes[use].thumbnail_spec_name, sum);
save_thumbnail(scaled, path, thum);
g_free(path);
if (!max_size_surface)
max_size_surface = scaled;
else
cairo_surface_destroy(scaled);
}
g_string_free(thum, TRUE);
g_free(thumbnails_dir);
g_free(sum);
g_free(uri);
cairo_surface_destroy(surface);
return max_size_surface;
}
static bool
check_wide_thumbnail_texts(GBytes *thum, const char *target, time_t mtime,
bool *sRGB)
{
gsize len = 0;
const gchar *s = g_bytes_get_data(thum, &len), *end = s + len;
// Similar to PNG below, but we're following our own specification.
const gchar *key = NULL, *nul = NULL;
bool have_uri = false, have_mtime = false;
for (; (nul = memchr(s, '\0', end - s)); s = ++nul) {
if (!key) {
key = s;
continue;
} else if (!strcmp(key, THUMB_URI)) {
have_uri = true;
if (strcmp(target, s))
return false;
} else if (!strcmp(key, THUMB_MTIME)) {
have_mtime = true;
if (atol(s) != mtime)
return false;
} else if (!strcmp(key, THUMB_COLORSPACE))
*sRGB = !strcmp(s, THUMB_COLORSPACE_SRGB);
key = NULL;
}
return have_uri && have_mtime;
}
static cairo_surface_t *
read_wide_thumbnail(
const char *path, const char *uri, time_t mtime, GError **error)
{
gchar *thumbnail_uri = g_filename_to_uri(path, NULL, error);
if (!thumbnail_uri)
return NULL;
cairo_surface_t *surface =
fiv_io_open(&(FivIoOpenContext){.uri = thumbnail_uri}, error);
g_free(thumbnail_uri);
if (!surface)
return NULL;
bool sRGB = false;
GBytes *thum = cairo_surface_get_user_data(surface, &fiv_io_key_thum);
if (!thum) {
g_clear_error(error);
set_error(error, "not a thumbnail");
} else if (!check_wide_thumbnail_texts(thum, uri, mtime, &sRGB)) {
g_clear_error(error);
set_error(error, "mismatch");
} else {
// TODO(p): Add a function or a non-valueless define to check
// for CMM presence, then remove this ifdef.
#ifdef HAVE_LCMS2
if (!sRGB)
mark_thumbnail_lq(surface);
#endif // HAVE_LCMS2
return surface;
}
cairo_surface_destroy(surface);
return NULL;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static cairo_surface_t *
read_png_thumbnail(
const char *path, const char *uri, time_t mtime, GError **error)
{
cairo_surface_t *surface = fiv_io_open_png_thumbnail(path, error);
if (!surface)
return NULL;
GHashTable *texts = cairo_surface_get_user_data(surface, &fiv_io_key_text);
if (!texts) {
set_error(error, "not a thumbnail");
cairo_surface_destroy(surface);
return NULL;
}
// May contain Thumb::Image::Width Thumb::Image::Height,
// but those aren't interesting currently (would be for fast previews).
const char *text_uri = g_hash_table_lookup(texts, THUMB_URI);
const char *text_mtime = g_hash_table_lookup(texts, THUMB_MTIME);
if (!text_uri || strcmp(text_uri, uri) ||
!text_mtime || atol(text_mtime) != mtime) {
set_error(error, "mismatch or not a thumbnail");
cairo_surface_destroy(surface);
return NULL;
}
return surface;
}
cairo_surface_t *
fiv_thumbnail_lookup(const char *uri, gint64 mtime_msec, FivThumbnailSize size)
{
g_return_val_if_fail(size >= FIV_THUMBNAIL_SIZE_MIN &&
size <= FIV_THUMBNAIL_SIZE_MAX, NULL);
gchar *sum = g_compute_checksum_for_string(G_CHECKSUM_MD5, uri, -1);
gchar *thumbnails_dir = fiv_thumbnail_get_root();
// The lookup sequence is: nominal..max, then mirroring back to ..min.
cairo_surface_t *result = NULL;
GError *error = NULL;
for (int i = 0; i < FIV_THUMBNAIL_SIZE_COUNT; i++) {
FivThumbnailSize use = size + i;
if (use > FIV_THUMBNAIL_SIZE_MAX)
use = FIV_THUMBNAIL_SIZE_MAX - i;
const char *name = fiv_thumbnail_sizes[use].thumbnail_spec_name;
gchar *wide =
g_strdup_printf("%s/wide-%s/%s.webp", thumbnails_dir, name, sum);
result = read_wide_thumbnail(wide, uri, mtime_msec / 1000, &error);
if (error) {
g_debug("%s: %s", wide, error->message);
g_clear_error(&error);
}
g_free(wide);
if (result) {
// Higher up we can't distinguish images smaller than the thumbnail.
// Also, try not to rescale the already rescaled.
if (use != size)
mark_thumbnail_lq(result);
break;
}
gchar *path =
g_strdup_printf("%s/%s/%s.png", thumbnails_dir, name, sum);
result = read_png_thumbnail(path, uri, mtime_msec / 1000, &error);
if (error) {
g_debug("%s: %s", path, error->message);
g_clear_error(&error);
}
g_free(path);
if (result) {
// Whatever produced it, we may be able to outclass it.
mark_thumbnail_lq(result);
break;
}
}
// TODO(p): We can definitely extract embedded thumbnails, but it should be
// done as a separate stage--the file may be stored on a slow device.
g_free(thumbnails_dir);
g_free(sum);
return result;
}
// --- Invalidation ------------------------------------------------------------
static void
print_error(GFile *file, GError *error)
{
gchar *name = g_file_get_parse_name(file);
g_printerr("%s: %s\n", name, error->message);
g_free(name);
g_error_free(error);
}
static gchar *
identify_wide_thumbnail(GMappedFile *mf, time_t *mtime, GError **error)
{
WebPDemuxer *demux = WebPDemux(&(WebPData) {
.bytes = (const uint8_t *) g_mapped_file_get_contents(mf),
.size = g_mapped_file_get_length(mf),
});
if (!demux) {
set_error(error, "demux failure while reading metadata");
return NULL;
}
WebPChunkIterator chunk_iter = {};
gchar *uri = NULL;
if (!WebPDemuxGetChunk(demux, "THUM", 1, &chunk_iter)) {
set_error(error, "missing THUM chunk");
goto fail;
}
// Similar to check_wide_thumbnail_texts(), but with a different purpose.
const char *p = (const char *) chunk_iter.chunk.bytes,
*end = p + chunk_iter.chunk.size, *key = NULL, *nul = NULL;
for (; (nul = memchr(p, '\0', end - p)); p = ++nul)
if (key) {
if (!strcmp(key, THUMB_URI) && !uri)
uri = g_strdup(p);
if (!strcmp(key, THUMB_MTIME))
*mtime = atol(p);
key = NULL;
} else {
key = p;
}
if (!uri)
set_error(error, "missing target URI");
WebPDemuxReleaseChunkIterator(&chunk_iter);
fail:
WebPDemuxDelete(demux);
return uri;
}
static void
check_wide_thumbnail(GFile *thumbnail, GError **error)
{
// Not all errors are enough of a reason for us to delete something.
GError *tolerable = NULL;
const char *path = g_file_peek_path(thumbnail);
GMappedFile *mf = g_mapped_file_new(path, FALSE, &tolerable);
if (!mf) {
print_error(thumbnail, tolerable);
return;
}
time_t target_mtime = 0;
gchar *target_uri = identify_wide_thumbnail(mf, &target_mtime, error);
g_mapped_file_unref(mf);
if (!target_uri)
return;
// This should not occur at all, we're being pedantic.
gchar *sum = g_compute_checksum_for_string(G_CHECKSUM_MD5, target_uri, -1);
gchar *expected_basename = g_strdup_printf("%s.webp", sum);
gchar *basename = g_path_get_basename(path);
gboolean match = !strcmp(basename, expected_basename);
g_free(basename);
g_free(expected_basename);
g_free(sum);
if (!match) {
set_error(error, "URI checksum mismatch");
g_free(target_uri);
return;
}
GFile *target = g_file_new_for_uri(target_uri);
g_free(target_uri);
GFileInfo *info = g_file_query_info(target,
G_FILE_ATTRIBUTE_STANDARD_NAME "," G_FILE_ATTRIBUTE_TIME_MODIFIED,
G_FILE_QUERY_INFO_NONE, NULL, &tolerable);
g_object_unref(target);
if (g_error_matches(tolerable, G_IO_ERROR, G_IO_ERROR_NOT_FOUND)) {
g_propagate_error(error, tolerable);
return;
} else if (tolerable) {
print_error(thumbnail, tolerable);
return;
}
GDateTime *mdatetime = g_file_info_get_modification_date_time(info);
g_object_unref(info);
if (!mdatetime) {
set_error(&tolerable, "cannot retrieve file modification time");
print_error(thumbnail, tolerable);
return;
}
if (g_date_time_to_unix(mdatetime) != target_mtime)
set_error(error, "mtime mismatch");
g_date_time_unref(mdatetime);
}
static void
invalidate_wide_thumbnail(GFile *thumbnail)
{
// It's possible to lift that restriction in the future,
// but we need to codify how the modification time should be checked.
const char *path = g_file_peek_path(thumbnail);
if (!path) {
print_error(thumbnail,
g_error_new_literal(G_IO_ERROR, G_IO_ERROR_FAILED,
"thumbnails are expected to be local files"));
return;
}
// You cannot kill what you did not create.
if (!g_str_has_suffix(path, ".webp"))
return;
GError *error = NULL;
check_wide_thumbnail(thumbnail, &error);
if (error) {
g_debug("Deleting %s: %s", path, error->message);
g_clear_error(&error);
if (!g_file_delete(thumbnail, NULL, &error))
print_error(thumbnail, error);
}
}
static void
invalidate_wide_thumbnail_directory(GFile *directory)
{
GError *error = NULL;
GFileEnumerator *enumerator = g_file_enumerate_children(directory,
G_FILE_ATTRIBUTE_STANDARD_NAME "," G_FILE_ATTRIBUTE_STANDARD_TYPE,
G_FILE_QUERY_INFO_NONE, NULL, &error);
if (!enumerator) {
print_error(directory, error);
return;
}
GFileInfo *info = NULL;
GFile *child = NULL;
while (g_file_enumerator_iterate(enumerator, &info, &child, NULL, &error) &&
info != NULL) {
if (g_file_info_get_file_type(info) == G_FILE_TYPE_REGULAR)
invalidate_wide_thumbnail(child);
}
g_object_unref(enumerator);
if (error)
print_error(directory, error);
}
void
fiv_thumbnail_invalidate(void)
{
gchar *thumbnails_dir = fiv_thumbnail_get_root();
for (int i = 0; i < FIV_THUMBNAIL_SIZE_COUNT; i++) {
const char *name = fiv_thumbnail_sizes[i].thumbnail_spec_name;
gchar *dirname = g_strdup_printf("wide-%s", name);
GFile *dir = g_file_new_build_filename(thumbnails_dir, dirname, NULL);
g_free(dirname);
invalidate_wide_thumbnail_directory(dir);
g_object_unref(dir);
}
g_free(thumbnails_dir);
}
|