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nsxivimage.c

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1/* Copyright 2011-2020 Bert Muennich
2 * Copyright 2021-2023 nsxiv contributors
3 *
4 * This file is a part of nsxiv.
5 *
6 * nsxiv is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; either version 2 of the License,
9 * or (at your option) any later version.
10 *
11 * nsxiv is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with nsxiv. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include "nsxiv.h"
21#define INCLUDE_IMAGE_CONFIG
22#include "config.h"
23
24#include <assert.h>
25#include <errno.h>
26#include <stdint.h>
27#include <stdlib.h>
28#include <string.h>
29#include <sys/stat.h>
30#include <unistd.h>
31
32#if HAVE_LIBEXIF
33#include <libexif/exif-data.h>
34#endif
35
36#ifdef IMLIB2_VERSION
37 #if IMLIB2_VERSION >= IMLIB2_VERSION_(1, 8, 0)
38 #define HAVE_IMLIB2_MULTI_FRAME 1
39 #endif
40#endif
41#ifndef HAVE_IMLIB2_MULTI_FRAME
42 #define HAVE_IMLIB2_MULTI_FRAME 0
43#endif
44
45#if HAVE_LIBGIF && !HAVE_IMLIB2_MULTI_FRAME
46#include <gif_lib.h>
47enum { DEF_GIF_DELAY = 75 };
48#endif
49
50#if HAVE_LIBWEBP && !HAVE_IMLIB2_MULTI_FRAME
51#include <stdio.h>
52#include <webp/decode.h>
53#include <webp/demux.h>
54enum { DEF_WEBP_DELAY = 75 };
55#endif
56
57#define ZOOM_MIN (zoom_levels[0] / 100)
58#define ZOOM_MAX (zoom_levels[ARRLEN(zoom_levels) - 1] / 100)
59
60static int calc_cache_size(void)
61{
62 long cache, pages = -1, page_size = -1;
63
64 if (CACHE_SIZE_MEM_PERCENTAGE <= 0)
65 return 0;
66#ifdef _SC_PHYS_PAGES /* _SC_PHYS_PAGES isn't POSIX */
67 pages = sysconf(_SC_PHYS_PAGES);
68 page_size = sysconf(_SC_PAGE_SIZE);
69#endif
70 if (pages < 0 || page_size < 0)
71 return CACHE_SIZE_FALLBACK;
72 cache = (pages / 100) * CACHE_SIZE_MEM_PERCENTAGE;
73 cache *= page_size;
74
75 return MIN(cache, CACHE_SIZE_LIMIT);
76}
77
78void img_init(img_t *img, win_t *win)
79{
80 imlib_context_set_display(win->env.dpy);
81 imlib_context_set_visual(win->env.vis);
82 imlib_context_set_colormap(win->env.cmap);
83 imlib_set_cache_size(calc_cache_size());
84
85 img->im = NULL;
86 img->win = win;
87 img->scalemode = options->scalemode;
88 img->zoom = options->zoom;
89 img->zoom = MAX(img->zoom, ZOOM_MIN);
90 img->zoom = MIN(img->zoom, ZOOM_MAX);
91 img->checkpan = false;
92 img->dirty = false;
93 img->anti_alias = options->anti_alias;
94 img->alpha_layer = options->alpha_layer;
95 img->multi.cap = img->multi.cnt = 0;
96 img->multi.animate = options->animate;
97 img->multi.framedelay = options->framerate > 0 ? 1000 / options->framerate : 0;
98 img->multi.length = 0;
99
100 img->cmod = imlib_create_color_modifier();
101 imlib_context_set_color_modifier(img->cmod);
102 img->brightness = 0;
103 img->contrast = 0;
104 img_change_color_modifier(img, options->gamma, &img->gamma);
105
106 img->ss.on = options->slideshow > 0;
107 img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY * 10u;
108}
109
110#if HAVE_LIBEXIF
111void exif_auto_orientate(const fileinfo_t *file)
112{
113 ExifData *ed;
114 ExifEntry *entry;
115 int byte_order, orientation = 0;
116
117 if ((ed = exif_data_new_from_file(file->path)) == NULL)
118 return;
119 byte_order = exif_data_get_byte_order(ed);
120 entry = exif_content_get_entry(ed->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION);
121 if (entry != NULL)
122 orientation = exif_get_short(entry->data, byte_order);
123 exif_data_unref(ed);
124
125 switch (orientation) {
126 case 5:
127 imlib_image_orientate(1);
128 /* fall through */
129 case 2:
130 imlib_image_flip_vertical();
131 break;
132 case 3:
133 imlib_image_orientate(2);
134 break;
135 case 7:
136 imlib_image_orientate(1);
137 /* fall through */
138 case 4:
139 imlib_image_flip_horizontal();
140 break;
141 case 6:
142 imlib_image_orientate(1);
143 break;
144 case 8:
145 imlib_image_orientate(3);
146 break;
147 }
148}
149#endif
150
151#if HAVE_LIBGIF || HAVE_LIBWEBP || HAVE_IMLIB2_MULTI_FRAME
152static void img_multiframe_context_set(img_t *img)
153{
154 if (img->multi.cnt > 1) {
155 imlib_context_set_image(img->im);
156 imlib_free_image();
157 img->im = img->multi.frames[0].im;
158 } else if (img->multi.cnt == 1) {
159 imlib_context_set_image(img->multi.frames[0].im);
160 imlib_free_image();
161 img->multi.cnt = 0;
162 }
163
164 imlib_context_set_image(img->im);
165}
166#endif
167
168#if (HAVE_LIBGIF || HAVE_LIBWEBP) && !HAVE_IMLIB2_MULTI_FRAME
169static void img_multiframe_deprecation_notice(void)
170{
171 static bool warned;
172 if (!warned) {
173 error(0, 0, "\n"
174 "################################################################\n"
175 "# DEPRECATION NOTICE #\n"
176 "################################################################\n"
177 "# Internal multi-frame gif and webp loaders are deprecated and #\n"
178 "# will be removed soon. Please upgrade to Imlib2 v1.8.0 for #\n"
179 "# multi-frame/animated image support. #\n"
180 "################################################################");
181 warned = true;
182 }
183}
184#endif
185
186#if HAVE_LIBGIF && !HAVE_IMLIB2_MULTI_FRAME
187static bool img_load_gif(img_t *img, const fileinfo_t *file)
188{
189 GifFileType *gif;
190 GifRowType *rows = NULL;
191 GifRecordType rec;
192 ColorMapObject *cmap;
193 uint32_t bgpixel = 0, *data, *ptr;
194 uint32_t *prev_frame = NULL;
195 Imlib_Image im;
196 int i, j, bg, r, g, b;
197 int x, y, w, h, sw, sh;
198 int px, py, pw, ph;
199 int intoffset[] = { 0, 4, 2, 1 };
200 int intjump[] = { 8, 8, 4, 2 };
201 int transp = -1;
202 unsigned int disposal = 0, prev_disposal = 0;
203 unsigned int delay = 0;
204 bool err = false;
205 multi_img_t *m = &img->multi;
206
207 img_multiframe_deprecation_notice();
208
209#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
210 gif = DGifOpenFileName(file->path, NULL);
211#else
212 gif = DGifOpenFileName(file->path);
213#endif
214 if (gif == NULL) {
215 error(0, 0, "%s: Error opening gif image", file->name);
216 return false;
217 }
218 bg = gif->SBackGroundColor;
219 sw = gif->SWidth;
220 sh = gif->SHeight;
221 px = py = pw = ph = 0;
222
223 m->length = m->cnt = m->sel = 0;
224 do {
225 if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
226 err = true;
227 break;
228 }
229 if (rec == EXTENSION_RECORD_TYPE) {
230 int ext_code;
231 GifByteType *ext = NULL;
232
233 DGifGetExtension(gif, &ext_code, &ext);
234 while (ext) {
235 if (ext_code == GRAPHICS_EXT_FUNC_CODE) {
236 if (ext[1] & 1)
237 transp = (int)ext[4];
238 else
239 transp = -1;
240
241 delay = 10 * ((unsigned int)ext[3] << 8 | (unsigned int)ext[2]);
242 disposal = (unsigned int)ext[1] >> 2 & 0x7;
243 }
244 ext = NULL;
245 DGifGetExtensionNext(gif, &ext);
246 }
247 } else if (rec == IMAGE_DESC_RECORD_TYPE) {
248 if (DGifGetImageDesc(gif) == GIF_ERROR) {
249 err = true;
250 break;
251 }
252 x = gif->Image.Left;
253 y = gif->Image.Top;
254 w = gif->Image.Width;
255 h = gif->Image.Height;
256
257 rows = emalloc(h * sizeof(*rows));
258 for (i = 0; i < h; i++)
259 rows[i] = emalloc(w * sizeof(*rows[i]));
260 if (gif->Image.Interlace) {
261 for (i = 0; i < 4; i++) {
262 for (j = intoffset[i]; j < h; j += intjump[i])
263 DGifGetLine(gif, rows[j], w);
264 }
265 } else {
266 for (i = 0; i < h; i++)
267 DGifGetLine(gif, rows[i], w);
268 }
269
270 ptr = data = emalloc(sw * sh * sizeof(*data));
271 cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
272 /* if bg > cmap->ColorCount, it is transparent black already */
273 if (cmap && bg >= 0 && bg < cmap->ColorCount) {
274 r = cmap->Colors[bg].Red;
275 g = cmap->Colors[bg].Green;
276 b = cmap->Colors[bg].Blue;
277 bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
278 }
279
280 for (i = 0; i < sh; i++) {
281 for (j = 0; j < sw; j++) {
282 if (i < y || i >= y + h || j < x || j >= x + w ||
283 rows[i - y][j - x] == transp)
284 {
285 if (prev_frame != NULL &&
286 (prev_disposal != 2 || i < py || i >= py + ph ||
287 j < px || j >= px + pw))
288 {
289 *ptr = prev_frame[i * sw + j];
290 } else {
291 *ptr = bgpixel;
292 }
293 } else {
294 assert(cmap != NULL);
295 r = cmap->Colors[rows[i - y][j - x]].Red;
296 g = cmap->Colors[rows[i - y][j - x]].Green;
297 b = cmap->Colors[rows[i - y][j - x]].Blue;
298 *ptr = 0xffu << 24 | r << 16 | g << 8 | b;
299 }
300 ptr++;
301 }
302 }
303
304 im = imlib_create_image_using_copied_data(sw, sh, data);
305
306 for (i = 0; i < h; i++)
307 free(rows[i]);
308 free(rows);
309 free(data);
310
311 if (im == NULL) {
312 err = true;
313 break;
314 }
315
316 imlib_context_set_image(im);
317 imlib_image_set_format("gif");
318 if (transp >= 0)
319 imlib_image_set_has_alpha(1);
320
321 if (disposal != 3)
322 prev_frame = imlib_image_get_data_for_reading_only();
323 prev_disposal = disposal;
324 px = x, py = y, pw = w, ph = h;
325
326 assert(m->cnt <= m->cap);
327 if (m->cnt == m->cap) {
328 m->cap = m->cap == 0 ? 16 : (m->cap * 2);
329 m->frames = erealloc(m->frames, m->cap * sizeof(*m->frames));
330 }
331 m->frames[m->cnt].im = im;
332 delay = m->framedelay > 0 ? m->framedelay : delay;
333 m->frames[m->cnt].delay = delay > 0 ? delay : DEF_GIF_DELAY;
334 m->length += m->frames[m->cnt].delay;
335 m->cnt++;
336 }
337 } while (rec != TERMINATE_RECORD_TYPE);
338
339#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
340 DGifCloseFile(gif, NULL);
341#else
342 DGifCloseFile(gif);
343#endif
344
345 if (err && (file->flags & FF_WARN))
346 error(0, 0, "%s: Corrupted gif file", file->name);
347
348 img_multiframe_context_set(img);
349
350 return !err;
351}
352#endif /* HAVE_LIBGIF */
353
354#if HAVE_LIBWEBP && !HAVE_IMLIB2_MULTI_FRAME
355static bool img_load_webp(img_t *img, const fileinfo_t *file)
356{
357 FILE *webp_file;
358 WebPData data;
359 Imlib_Image im = NULL;
360 struct WebPAnimDecoderOptions opts;
361 WebPAnimDecoder *dec = NULL;
362 struct WebPAnimInfo info;
363 unsigned char *buf = NULL, *bytes = NULL;
364 int ts;
365 const WebPDemuxer *demux;
366 WebPIterator iter;
367 unsigned long flags;
368 unsigned int delay;
369 bool err = false;
370 multi_img_t *m = &img->multi;
371
372 img_multiframe_deprecation_notice();
373
374 if ((webp_file = fopen(file->path, "rb")) == NULL) {
375 error(0, errno, "%s: Error opening webp image", file->name);
376 return false;
377 }
378 fseek(webp_file, 0L, SEEK_END);
379 data.size = ftell(webp_file);
380 rewind(webp_file);
381 bytes = emalloc(data.size);
382 if ((err = fread(bytes, 1, data.size, webp_file) != data.size)) {
383 error(0, 0, "%s: Error reading webp image", file->name);
384 goto fail;
385 }
386 data.bytes = bytes;
387
388 /* Setup the WebP Animation Decoder */
389 if ((err = !WebPAnimDecoderOptionsInit(&opts))) {
390 error(0, 0, "%s: WebP library version mismatch", file->name);
391 goto fail;
392 }
393 opts.color_mode = MODE_BGRA;
394 /* NOTE: Multi-threaded decoding may cause problems on some system */
395 opts.use_threads = true;
396 dec = WebPAnimDecoderNew(&data, &opts);
397 if ((err = (dec == NULL) || !WebPAnimDecoderGetInfo(dec, &info))) {
398 error(0, 0, "%s: WebP parsing or memory error (file is corrupt?)", file->name);
399 goto fail;
400 }
401 demux = WebPAnimDecoderGetDemuxer(dec);
402
403 /* Get global information for the image */
404 flags = WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS);
405 img->w = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
406 img->h = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
407
408 if (info.frame_count > m->cap) {
409 m->cap = info.frame_count;
410 m->frames = erealloc(m->frames, m->cap * sizeof(*m->frames));
411 }
412
413 /* Load and decode frames (also works on images with only 1 frame) */
414 m->length = m->cnt = m->sel = 0;
415 while (WebPAnimDecoderGetNext(dec, &buf, &ts)) {
416 im = imlib_create_image_using_copied_data(info.canvas_width, info.canvas_height,
417 (uint32_t *)buf);
418 imlib_context_set_image(im);
419 imlib_image_set_format("webp");
420 /* Get an iterator of this frame - used for frame info (duration, etc.) */
421 WebPDemuxGetFrame(demux, m->cnt + 1, &iter);
422 imlib_image_set_has_alpha((flags & ALPHA_FLAG) == ALPHA_FLAG);
423 /* Store info for this frame */
424 m->frames[m->cnt].im = im;
425 delay = iter.duration > 0 ? iter.duration : DEF_WEBP_DELAY;
426 m->frames[m->cnt].delay = delay;
427 m->length += m->frames[m->cnt].delay;
428 m->cnt++;
429 }
430 WebPDemuxReleaseIterator(&iter);
431
432 img_multiframe_context_set(img);
433fail:
434 if (dec != NULL)
435 WebPAnimDecoderDelete(dec);
436 free(bytes);
437 fclose(webp_file);
438 return !err;
439}
440#endif /* HAVE_LIBWEBP */
441
442#if HAVE_IMLIB2_MULTI_FRAME
443static void img_area_clear(int x, int y, int w, int h)
444{
445 assert(x >= 0 && y >= 0);
446 assert(w > 0 && h > 0);
447 imlib_image_set_has_alpha(1);
448 imlib_context_set_blend(0);
449 imlib_context_set_color(0, 0, 0, 0);
450 imlib_image_fill_rectangle(x, y, w, h);
451}
452
453static bool img_load_multiframe(img_t *img, const fileinfo_t *file)
454{
455 unsigned int n, fcnt;
456 Imlib_Image blank;
457 Imlib_Frame_Info finfo;
458 int px, py, pw, ph, pflag;
459 multi_img_t *m = &img->multi;
460
461 imlib_context_set_image(img->im);
462 imlib_image_get_frame_info(&finfo);
463 if ((fcnt = finfo.frame_count) <= 1 || !(finfo.frame_flags & IMLIB_IMAGE_ANIMATED))
464 return false;
465 img->w = finfo.canvas_w;
466 img->h = finfo.canvas_h;
467
468 if (fcnt > m->cap) {
469 m->cap = fcnt;
470 m->frames = erealloc(m->frames, m->cap * sizeof(*m->frames));
471 }
472
473 imlib_context_set_dither(0);
474 imlib_context_set_anti_alias(0);
475 imlib_context_set_color_modifier(NULL);
476 imlib_context_set_operation(IMLIB_OP_COPY);
477
478 if ((blank = imlib_create_image(img->w, img->h)) == NULL) {
479 error(0, 0, "%s: couldn't create image", file->name);
480 return false;
481 }
482 imlib_context_set_image(blank);
483 img_area_clear(0, 0, img->w, img->h);
484
485 /*
486 * Imlib2 gives back a "raw frame", we need to blend it on top of the
487 * previous frame ourselves if necessary to get the fully decoded frame.
488 */
489 pflag = m->length = m->cnt = m->sel = 0;
490 px = py = pw = ph = 0;
491 for (n = 1; n <= fcnt; ++n) {
492 Imlib_Image frame, canvas;
493 int sx, sy, sw, sh;
494 bool has_alpha;
495
496 imlib_context_set_image(m->cnt < 1 ? blank : m->frames[m->cnt - 1].im);
497 if ((canvas = imlib_clone_image()) == NULL ||
498 (frame = imlib_load_image_frame(file->path, n)) == NULL)
499 {
500 if (canvas != NULL) {
501 imlib_context_set_image(canvas);
502 imlib_free_image();
503 }
504 error(0, 0, "%s: failed to load frame %d", file->name, n);
505 break;
506 }
507
508 imlib_context_set_image(frame);
509 imlib_image_set_changes_on_disk(); /* see img_load() for rationale */
510 imlib_image_get_frame_info(&finfo);
511 assert(finfo.frame_count == (int)fcnt);
512 assert(finfo.canvas_w == img->w && finfo.canvas_h == img->h);
513 sx = finfo.frame_x;
514 sy = finfo.frame_y;
515 sw = finfo.frame_w;
516 sh = finfo.frame_h;
517 has_alpha = imlib_image_has_alpha();
518
519 imlib_context_set_image(canvas);
520 /* the dispose flags are explained in Imlib2's header */
521 if (pflag & IMLIB_FRAME_DISPOSE_CLEAR) {
522 img_area_clear(px, py, pw, ph);
523 } else if (pflag & IMLIB_FRAME_DISPOSE_PREV) {
524 Imlib_Image p = m->cnt < 2 ? blank : m->frames[m->cnt - 2].im;
525 assert(m->cnt > 0);
526 img_area_clear(0, 0, img->w, img->h);
527 imlib_blend_image_onto_image(p, 1, px, py, pw, ph, px, py, pw, ph);
528 }
529 pflag = finfo.frame_flags;
530 if (pflag & (IMLIB_FRAME_DISPOSE_CLEAR | IMLIB_FRAME_DISPOSE_PREV)) {
531 /* remember these so we can "dispose" them before blending next frame */
532 px = sx;
533 py = sy;
534 pw = sw;
535 ph = sh;
536 }
537 assert(imlib_context_get_operation() == IMLIB_OP_COPY);
538 imlib_image_set_has_alpha(has_alpha);
539 imlib_context_set_blend(!!(finfo.frame_flags & IMLIB_FRAME_BLEND));
540 imlib_blend_image_onto_image(frame, has_alpha, 0, 0, sw, sh, sx, sy, sw, sh);
541 m->frames[m->cnt].im = canvas;
542 m->frames[m->cnt].delay = finfo.frame_delay;
543 m->length += m->frames[m->cnt].delay;
544 m->cnt++;
545 imlib_context_set_image(frame);
546 imlib_free_image();
547 }
548 imlib_context_set_image(blank);
549 imlib_free_image();
550 img_multiframe_context_set(img);
551 return m->cnt > 0;
552}
553#endif /* HAVE_IMLIB2_MULTI_FRAME */
554
555Imlib_Image img_open(const fileinfo_t *file)
556{
557 struct stat st;
558 Imlib_Image im = NULL;
559
560 if (access(file->path, R_OK) == 0 &&
561 stat(file->path, &st) == 0 && S_ISREG(st.st_mode) &&
562#if HAVE_IMLIB2_MULTI_FRAME
563 (im = imlib_load_image_frame(file->path, 1)) != NULL)
564#else
565 (im = imlib_load_image_immediately(file->path)) != NULL)
566#endif
567 {
568 imlib_context_set_image(im);
569 }
570 if (im == NULL && (file->flags & FF_WARN))
571 error(0, 0, "%s: Error opening image", file->name);
572 return im;
573}
574
575bool img_load(img_t *img, const fileinfo_t *file)
576{
577 const char *fmt;
578 bool animated = false;
579
580 if ((img->im = img_open(file)) == NULL)
581 return false;
582
583 /* ensure that the image's timestamp is checked when loading from cache
584 * to avoid issues like: https://codeberg.org/nsxiv/nsxiv/issues/436
585 */
586 imlib_image_set_changes_on_disk();
587
588/* since v1.7.5, Imlib2 can parse exif orientation from jpeg files.
589 * this version also happens to be the first one which defines the
590 * IMLIB2_VERSION macro.
591 */
592#if HAVE_LIBEXIF && !defined(IMLIB2_VERSION)
593 exif_auto_orientate(file);
594#endif
595
596#if HAVE_IMLIB2_MULTI_FRAME
597 animated = img_load_multiframe(img, file);
598#endif
599
600 if ((fmt = imlib_image_format()) != NULL) { /* NOLINT: fmt might be unused, not worth fixing */
601#if HAVE_LIBGIF && !HAVE_IMLIB2_MULTI_FRAME
602 if (STREQ(fmt, "gif"))
603 img_load_gif(img, file);
604#endif
605#if HAVE_LIBWEBP && !HAVE_IMLIB2_MULTI_FRAME
606 if (STREQ(fmt, "webp"))
607 img_load_webp(img, file);
608#endif
609#if HAVE_LIBEXIF && defined(IMLIB2_VERSION)
610 if (!STREQ(fmt, "jpeg") && !STREQ(fmt, "jpg"))
611 exif_auto_orientate(file);
612#endif
613 }
614 /* for animated images, we want the _canvas_ width/height, which
615 * img_load_multiframe() sets already.
616 */
617 if (!animated) {
618 img->w = imlib_image_get_width();
619 img->h = imlib_image_get_height();
620 }
621 img->checkpan = true;
622 img->dirty = true;
623
624 return true;
625}
626
627CLEANUP void img_close(img_t *img, bool decache)
628{
629 unsigned int i;
630 void (*free_img)(void) = decache ? imlib_free_image_and_decache : imlib_free_image;
631
632 if (img->multi.cnt > 0) {
633 for (i = 0; i < img->multi.cnt; i++) {
634 imlib_context_set_image(img->multi.frames[i].im);
635 free_img();
636 }
637 img->multi.cnt = 0;
638 img->im = NULL;
639 } else if (img->im != NULL) {
640 imlib_context_set_image(img->im);
641 free_img();
642 img->im = NULL;
643 }
644}
645
646static void img_check_pan(img_t *img, bool moved)
647{
648 win_t *win;
649 float w, h, ox, oy;
650
651 win = img->win;
652 w = img->w * img->zoom;
653 h = img->h * img->zoom;
654 ox = img->x;
655 oy = img->y;
656
657 if (w < win->w)
658 img->x = (win->w - w) / 2;
659 else if (img->x > 0)
660 img->x = 0;
661 else if (img->x + w < win->w)
662 img->x = win->w - w;
663 if (h < win->h)
664 img->y = (win->h - h) / 2;
665 else if (img->y > 0)
666 img->y = 0;
667 else if (img->y + h < win->h)
668 img->y = win->h - h;
669
670 if (!moved && (ox != img->x || oy != img->y))
671 img->dirty = true;
672}
673
674static bool img_fit(img_t *img)
675{
676 float z, zw, zh;
677
678 if (img->scalemode == SCALE_ZOOM)
679 return false;
680
681 zw = (float)img->win->w / (float)img->w;
682 zh = (float)img->win->h / (float)img->h;
683
684 switch (img->scalemode) {
685 case SCALE_FILL:
686 z = MAX(zw, zh);
687 break;
688 case SCALE_WIDTH:
689 z = zw;
690 break;
691 case SCALE_HEIGHT:
692 z = zh;
693 break;
694 default:
695 z = MIN(zw, zh);
696 break;
697 }
698 z = MIN(z, img->scalemode == SCALE_DOWN ? 1.0 : ZOOM_MAX);
699
700 if (ABS(img->zoom - z) > 1.0 / MAX(img->w, img->h)) {
701 img->zoom = z;
702 img->dirty = title_dirty = true;
703 return true;
704 } else {
705 return false;
706 }
707}
708
709void img_render(img_t *img)
710{
711 win_t *win;
712 int sx, sy, sw, sh;
713 int dx, dy, dw, dh;
714 Imlib_Image bg;
715
716 win = img->win;
717 img_fit(img);
718
719 if (img->checkpan) {
720 img_check_pan(img, false);
721 img->checkpan = false;
722 }
723
724 if (!img->dirty)
725 return;
726
727 /* calculate source and destination offsets:
728 * - part of image drawn on full window, or
729 * - full image drawn on part of window
730 */
731 if (img->x <= 0) {
732 sx = -img->x / img->zoom + 0.5;
733 sw = win->w / img->zoom;
734 dx = 0;
735 dw = win->w;
736 } else {
737 sx = 0;
738 sw = img->w;
739 dx = img->x;
740 dw = MAX(img->w * img->zoom, 1);
741 }
742 if (img->y <= 0) {
743 sy = -img->y / img->zoom + 0.5;
744 sh = win->h / img->zoom;
745 dy = win->bar.top ? win->bar.h : 0;
746 dh = win->h;
747 } else {
748 sy = 0;
749 sh = img->h;
750 dy = img->y + (win->bar.top ? win->bar.h : 0);
751 dh = MAX(img->h * img->zoom, 1);
752 }
753
754 win_clear(win);
755
756 imlib_context_set_image(img->im);
757 imlib_context_set_anti_alias(img->anti_alias);
758 imlib_context_set_drawable(win->buf.pm);
759
760 /* manual blending, for performance reasons.
761 * see https://phab.enlightenment.org/T8969#156167 for more details.
762 */
763 if (imlib_image_has_alpha()) {
764 if ((bg = imlib_create_image(dw, dh)) == NULL) {
765 error(0, ENOMEM, "Failed to create image");
766 goto fallback;
767 }
768 imlib_context_set_image(bg);
769 imlib_image_set_has_alpha(0);
770
771 if (img->alpha_layer) {
772 int i, c, r;
773 uint32_t col[2] = { 0xFF666666, 0xFF999999 };
774 uint32_t *data = imlib_image_get_data();
775
776 for (r = 0; r < dh; r++) {
777 i = r * dw;
778 if (r == 0 || r == 8) {
779 for (c = 0; c < dw; c++)
780 data[i++] = col[!(c & 8) ^ !r];
781 } else {
782 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
783 }
784 }
785 imlib_image_put_back_data(data);
786 } else {
787 XColor c = win->win_bg;
788 imlib_context_set_color(c.red >> 8, c.green >> 8, c.blue >> 8, 0xFF);
789 imlib_image_fill_rectangle(0, 0, dw, dh);
790 }
791 imlib_context_set_blend(1);
792 imlib_context_set_operation(IMLIB_OP_COPY);
793 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
794 imlib_context_set_color_modifier(NULL);
795 imlib_render_image_on_drawable(dx, dy);
796 imlib_free_image();
797 imlib_context_set_color_modifier(img->cmod);
798 } else {
799fallback:
800 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
801 }
802 img->dirty = false;
803}
804
805bool img_fit_win(img_t *img, scalemode_t sm)
806{
807 float oz;
808
809 oz = img->zoom;
810 img->scalemode = sm;
811
812 if (img_fit(img)) {
813 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
814 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
815 img->checkpan = true;
816 return true;
817 } else {
818 return false;
819 }
820}
821
822bool img_zoom_to(img_t *img, float z)
823{
824 int x, y;
825 if (ZOOM_MIN <= z && z <= ZOOM_MAX) {
826 win_cursor_pos(img->win, &x, &y);
827 if (x < 0 || (unsigned int)x >= img->win->w ||
828 y < 0 || (unsigned int)y >= img->win->h)
829 {
830 x = img->win->w / 2;
831 y = img->win->h / 2;
832 }
833 img->x = x - (x - img->x) * z / img->zoom;
834 img->y = y - (y - img->y) * z / img->zoom;
835 img->zoom = z;
836 img->scalemode = SCALE_ZOOM;
837 img->dirty = img->checkpan = title_dirty = true;
838 return true;
839 } else {
840 return false;
841 }
842}
843
844bool img_zoom(img_t *img, int d)
845{
846 int i = d > 0 ? 0 : (int)ARRLEN(zoom_levels) - 1;
847 while (i >= 0 && i < (int)ARRLEN(zoom_levels) &&
848 (d > 0 ? zoom_levels[i] / 100 <= img->zoom : zoom_levels[i] / 100 >= img->zoom))
849 {
850 i += d;
851 }
852 i = MIN(MAX(i, 0), (int)ARRLEN(zoom_levels) - 1);
853 return img_zoom_to(img, zoom_levels[i] / 100);
854}
855
856bool img_pos(img_t *img, float x, float y)
857{
858 float ox, oy;
859
860 ox = img->x;
861 oy = img->y;
862
863 img->x = x;
864 img->y = y;
865
866 img_check_pan(img, true);
867
868 if (ox != img->x || oy != img->y) {
869 img->dirty = true;
870 return true;
871 } else {
872 return false;
873 }
874}
875
876static bool img_move(img_t *img, float dx, float dy)
877{
878 return img_pos(img, img->x + dx, img->y + dy);
879}
880
881bool img_pan(img_t *img, direction_t dir, int d)
882{
883 /* d < 0: screen-wise
884 * d = 0: 1/PAN_FRACTION of screen
885 * d > 0: num of pixels
886 */
887 float x, y;
888
889 if (d > 0) {
890 x = y = MAX(1, (float)d * img->zoom);
891 } else {
892 x = img->win->w / (d < 0 ? 1 : PAN_FRACTION);
893 y = img->win->h / (d < 0 ? 1 : PAN_FRACTION);
894 }
895
896 switch (dir) {
897 case DIR_LEFT:
898 return img_move(img, x, 0.0);
899 case DIR_RIGHT:
900 return img_move(img, -x, 0.0);
901 case DIR_UP:
902 return img_move(img, 0.0, y);
903 case DIR_DOWN:
904 return img_move(img, 0.0, -y);
905 }
906 return false;
907}
908
909bool img_pan_center(img_t *img)
910{
911 float x, y;
912 x = (img->win->w - img->w * img->zoom) / 2.0;
913 y = (img->win->h - img->h * img->zoom) / 2.0;
914 return img_pos(img, x, y);
915}
916
917bool img_pan_edge(img_t *img, direction_t dir)
918{
919 float ox, oy;
920
921 ox = img->x;
922 oy = img->y;
923
924 if (dir & DIR_LEFT)
925 img->x = 0;
926 if (dir & DIR_RIGHT)
927 img->x = img->win->w - img->w * img->zoom;
928 if (dir & DIR_UP)
929 img->y = 0;
930 if (dir & DIR_DOWN)
931 img->y = img->win->h - img->h * img->zoom;
932
933 img_check_pan(img, true);
934
935 if (ox != img->x || oy != img->y) {
936 img->dirty = true;
937 return true;
938 } else {
939 return false;
940 }
941}
942
943void img_rotate(img_t *img, degree_t d)
944{
945 unsigned int i, tmp;
946 float ox, oy;
947
948 imlib_context_set_image(img->im);
949 imlib_image_orientate(d);
950
951 for (i = 0; i < img->multi.cnt; i++) {
952 if (i != img->multi.sel) {
953 imlib_context_set_image(img->multi.frames[i].im);
954 imlib_image_orientate(d);
955 }
956 }
957 if (d == DEGREE_90 || d == DEGREE_270) {
958 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
959 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
960
961 img->x = oy + (img->win->w - img->win->h) / 2;
962 img->y = ox + (img->win->h - img->win->w) / 2;
963
964 tmp = img->w;
965 img->w = img->h;
966 img->h = tmp;
967 img->checkpan = true;
968 }
969 img->dirty = true;
970}
971
972void img_flip(img_t *img, flipdir_t d)
973{
974 unsigned int i;
975 void (*imlib_flip_op[3])(void) = {
976 imlib_image_flip_horizontal,
977 imlib_image_flip_vertical,
978 imlib_image_flip_diagonal
979 };
980
981 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
982
983 if (d < 0 || d >= ARRLEN(imlib_flip_op))
984 return;
985
986 imlib_context_set_image(img->im);
987 imlib_flip_op[d]();
988
989 for (i = 0; i < img->multi.cnt; i++) {
990 if (i != img->multi.sel) {
991 imlib_context_set_image(img->multi.frames[i].im);
992 imlib_flip_op[d]();
993 }
994 }
995 img->dirty = true;
996}
997
998void img_toggle_antialias(img_t *img)
999{
1000 img->anti_alias = !img->anti_alias;
1001 imlib_context_set_image(img->im);
1002 imlib_context_set_anti_alias(img->anti_alias);
1003 img->dirty = true;
1004}
1005
1006static double steps_to_range(int d, double max, double offset)
1007{
1008 return offset + d * ((d <= 0 ? 1.0 : (max - 1.0)) / CC_STEPS);
1009}
1010
1011void img_update_color_modifiers(img_t *img)
1012{
1013 assert(imlib_context_get_color_modifier() == img->cmod);
1014 imlib_reset_color_modifier();
1015
1016 if (img->gamma != 0)
1017 imlib_modify_color_modifier_gamma(steps_to_range(img->gamma, GAMMA_MAX, 1.0));
1018 if (img->brightness != 0)
1019 imlib_modify_color_modifier_brightness(steps_to_range(img->brightness, BRIGHTNESS_MAX, 0.0));
1020 if (img->contrast != 0)
1021 imlib_modify_color_modifier_contrast(steps_to_range(img->contrast, CONTRAST_MAX, 1.0));
1022
1023 img->dirty = true;
1024}
1025
1026bool img_change_color_modifier(img_t *img, int d, int *target)
1027{
1028 int value = d == 0 ? 0 : MIN(MAX(*target + d, -CC_STEPS), CC_STEPS);
1029
1030 if (*target == value)
1031 return false;
1032
1033 *target = value;
1034 img_update_color_modifiers(img);
1035 return true;
1036}
1037
1038static bool img_frame_goto(img_t *img, int n)
1039{
1040 if (n < 0 || (unsigned int)n >= img->multi.cnt || (unsigned int)n == img->multi.sel)
1041 return false;
1042
1043 img->multi.sel = n;
1044 img->im = img->multi.frames[n].im;
1045
1046 imlib_context_set_image(img->im);
1047 img->w = imlib_image_get_width();
1048 img->h = imlib_image_get_height();
1049 img->checkpan = true;
1050 img->dirty = true;
1051
1052 return true;
1053}
1054
1055bool img_frame_navigate(img_t *img, int d)
1056{
1057 if (img->multi.cnt == 0 || d == 0)
1058 return false;
1059
1060 d += img->multi.sel;
1061 d = MAX(0, MIN(d, (int)img->multi.cnt - 1));
1062
1063 return img_frame_goto(img, d);
1064}
1065
1066bool img_frame_animate(img_t *img)
1067{
1068 if (img->multi.cnt > 0)
1069 return img_frame_goto(img, (img->multi.sel + 1) % img->multi.cnt);
1070 else
1071 return false;
1072}