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nsxivimage.c

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1/* Copyright 2011-2020 Bert Muennich
2 * Copyright 2021-2022 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#if HAVE_LIBGIF
37#include <gif_lib.h>
38enum { DEF_GIF_DELAY = 75 };
39#endif
40
41#if HAVE_LIBWEBP
42#include <stdio.h>
43#include <webp/decode.h>
44#include <webp/demux.h>
45enum { DEF_WEBP_DELAY = 75 };
46#endif
47
48#define ZOOM_MIN (zoom_levels[0] / 100)
49#define ZOOM_MAX (zoom_levels[ARRLEN(zoom_levels)-1] / 100)
50
51static int calc_cache_size(void)
52{
53 long cache, pages = -1, page_size = -1;
54
55 if (CACHE_SIZE_MEM_PERCENTAGE <= 0)
56 return 0;
57#ifdef _SC_PHYS_PAGES /* _SC_PHYS_PAGES isn't POSIX */
58 pages = sysconf(_SC_PHYS_PAGES);
59 page_size = sysconf(_SC_PAGE_SIZE);
60#endif
61 if (pages < 0 || page_size < 0)
62 return CACHE_SIZE_FALLBACK;
63 cache = (pages/100) * CACHE_SIZE_MEM_PERCENTAGE;
64 cache *= page_size;
65
66 return MIN(cache, CACHE_SIZE_LIMIT);
67}
68
69void img_init(img_t *img, win_t *win)
70{
71 imlib_context_set_display(win->env.dpy);
72 imlib_context_set_visual(win->env.vis);
73 imlib_context_set_colormap(win->env.cmap);
74 imlib_set_cache_size(calc_cache_size());
75
76 img->im = NULL;
77 img->win = win;
78 img->scalemode = options->scalemode;
79 img->zoom = options->zoom;
80 img->zoom = MAX(img->zoom, ZOOM_MIN);
81 img->zoom = MIN(img->zoom, ZOOM_MAX);
82 img->checkpan = false;
83 img->dirty = false;
84 img->anti_alias = options->anti_alias;
85 img->alpha = ALPHA_LAYER;
86 img->multi.cap = img->multi.cnt = 0;
87 img->multi.animate = options->animate;
88 img->multi.framedelay = options->framerate > 0 ? 1000 / options->framerate : 0;
89 img->multi.length = 0;
90
91 img->cmod = imlib_create_color_modifier();
92 imlib_context_set_color_modifier(img->cmod);
93 img->brightness = 0;
94 img->contrast = 0;
95 img_change_color_modifier(img, options->gamma, &img->gamma);
96
97 img->ss.on = options->slideshow > 0;
98 img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY * 10u;
99}
100
101#if HAVE_LIBEXIF
102void exif_auto_orientate(const fileinfo_t *file)
103{
104 ExifData *ed;
105 ExifEntry *entry;
106 int byte_order, orientation = 0;
107
108 if ((ed = exif_data_new_from_file(file->path)) == NULL)
109 return;
110 byte_order = exif_data_get_byte_order(ed);
111 entry = exif_content_get_entry(ed->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION);
112 if (entry != NULL)
113 orientation = exif_get_short(entry->data, byte_order);
114 exif_data_unref(ed);
115
116 switch (orientation) {
117 case 5:
118 imlib_image_orientate(1);
119 /* fall through */
120 case 2:
121 imlib_image_flip_vertical();
122 break;
123 case 3:
124 imlib_image_orientate(2);
125 break;
126 case 7:
127 imlib_image_orientate(1);
128 /* fall through */
129 case 4:
130 imlib_image_flip_horizontal();
131 break;
132 case 6:
133 imlib_image_orientate(1);
134 break;
135 case 8:
136 imlib_image_orientate(3);
137 break;
138 }
139}
140#endif
141
142#if HAVE_LIBGIF || HAVE_LIBWEBP
143static void img_multiframe_context_set(img_t *img)
144{
145 if (img->multi.cnt > 1) {
146 imlib_context_set_image(img->im);
147 imlib_free_image();
148 img->im = img->multi.frames[0].im;
149 } else if (img->multi.cnt == 1) {
150 imlib_context_set_image(img->multi.frames[0].im);
151 imlib_free_image();
152 img->multi.cnt = 0;
153 }
154
155 imlib_context_set_image(img->im);
156}
157#endif
158
159#if HAVE_LIBGIF
160static bool img_load_gif(img_t *img, const fileinfo_t *file)
161{
162 GifFileType *gif;
163 GifRowType *rows = NULL;
164 GifRecordType rec;
165 ColorMapObject *cmap;
166 uint32_t bgpixel = 0, *data, *ptr;
167 uint32_t *prev_frame = NULL;
168 Imlib_Image im;
169 int i, j, bg, r, g, b;
170 int x, y, w, h, sw, sh;
171 int px, py, pw, ph;
172 int intoffset[] = { 0, 4, 2, 1 };
173 int intjump[] = { 8, 8, 4, 2 };
174 int transp = -1;
175 unsigned int disposal = 0, prev_disposal = 0;
176 unsigned int delay = 0;
177 bool err = false;
178 multi_img_t *m = &img->multi;
179
180#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
181 gif = DGifOpenFileName(file->path, NULL);
182#else
183 gif = DGifOpenFileName(file->path);
184#endif
185 if (gif == NULL) {
186 error(0, 0, "%s: Error opening gif image", file->name);
187 return false;
188 }
189 bg = gif->SBackGroundColor;
190 sw = gif->SWidth;
191 sh = gif->SHeight;
192 px = py = pw = ph = 0;
193
194 m->length = m->cnt = m->sel = 0;
195 do {
196 if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
197 err = true;
198 break;
199 }
200 if (rec == EXTENSION_RECORD_TYPE) {
201 int ext_code;
202 GifByteType *ext = NULL;
203
204 DGifGetExtension(gif, &ext_code, &ext);
205 while (ext) {
206 if (ext_code == GRAPHICS_EXT_FUNC_CODE) {
207 if (ext[1] & 1)
208 transp = (int) ext[4];
209 else
210 transp = -1;
211
212 delay = 10 * ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
213 disposal = (unsigned int) ext[1] >> 2 & 0x7;
214 }
215 ext = NULL;
216 DGifGetExtensionNext(gif, &ext);
217 }
218 } else if (rec == IMAGE_DESC_RECORD_TYPE) {
219 if (DGifGetImageDesc(gif) == GIF_ERROR) {
220 err = true;
221 break;
222 }
223 x = gif->Image.Left;
224 y = gif->Image.Top;
225 w = gif->Image.Width;
226 h = gif->Image.Height;
227
228 rows = emalloc(h * sizeof(*rows));
229 for (i = 0; i < h; i++)
230 rows[i] = emalloc(w * sizeof(*rows[i]));
231 if (gif->Image.Interlace) {
232 for (i = 0; i < 4; i++) {
233 for (j = intoffset[i]; j < h; j += intjump[i])
234 DGifGetLine(gif, rows[j], w);
235 }
236 } else {
237 for (i = 0; i < h; i++)
238 DGifGetLine(gif, rows[i], w);
239 }
240
241 ptr = data = emalloc(sw * sh * sizeof(*data));
242 cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
243 /* if bg > cmap->ColorCount, it is transparent black already */
244 if (cmap && bg >= 0 && bg < cmap->ColorCount) {
245 r = cmap->Colors[bg].Red;
246 g = cmap->Colors[bg].Green;
247 b = cmap->Colors[bg].Blue;
248 bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
249 }
250
251 for (i = 0; i < sh; i++) {
252 for (j = 0; j < sw; j++) {
253 if (i < y || i >= y + h || j < x || j >= x + w ||
254 rows[i-y][j-x] == transp)
255 {
256 if (prev_frame != NULL && (prev_disposal != 2 ||
257 i < py || i >= py + ph || j < px || j >= px + pw))
258 {
259 *ptr = prev_frame[i * sw + j];
260 } else {
261 *ptr = bgpixel;
262 }
263 } else {
264 assert(cmap != NULL);
265 r = cmap->Colors[rows[i-y][j-x]].Red;
266 g = cmap->Colors[rows[i-y][j-x]].Green;
267 b = cmap->Colors[rows[i-y][j-x]].Blue;
268 *ptr = 0xffu << 24 | r << 16 | g << 8 | b;
269 }
270 ptr++;
271 }
272 }
273
274 im = imlib_create_image_using_copied_data(sw, sh, data);
275
276 for (i = 0; i < h; i++)
277 free(rows[i]);
278 free(rows);
279 free(data);
280
281 if (im == NULL) {
282 err = true;
283 break;
284 }
285
286 imlib_context_set_image(im);
287 imlib_image_set_format("gif");
288 if (transp >= 0)
289 imlib_image_set_has_alpha(1);
290
291 if (disposal != 3)
292 prev_frame = imlib_image_get_data_for_reading_only();
293 prev_disposal = disposal;
294 px = x, py = y, pw = w, ph = h;
295
296 assert(m->cnt <= m->cap);
297 if (m->cnt == m->cap) {
298 m->cap = m->cap == 0 ? 16 : (m->cap * 2);
299 m->frames = erealloc(m->frames, m->cap * sizeof(*m->frames));
300 }
301 m->frames[m->cnt].im = im;
302 delay = m->framedelay > 0 ? m->framedelay : delay;
303 m->frames[m->cnt].delay = delay > 0 ? delay : DEF_GIF_DELAY;
304 m->length += m->frames[m->cnt].delay;
305 m->cnt++;
306 }
307 } while (rec != TERMINATE_RECORD_TYPE);
308
309#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
310 DGifCloseFile(gif, NULL);
311#else
312 DGifCloseFile(gif);
313#endif
314
315 if (err && (file->flags & FF_WARN))
316 error(0, 0, "%s: Corrupted gif file", file->name);
317
318 img_multiframe_context_set(img);
319
320 return !err;
321}
322#endif /* HAVE_LIBGIF */
323
324
325#if HAVE_LIBWEBP
326static bool img_load_webp(img_t *img, const fileinfo_t *file)
327{
328 FILE *webp_file;
329 WebPData data;
330 Imlib_Image im = NULL;
331 struct WebPAnimDecoderOptions opts;
332 WebPAnimDecoder *dec = NULL;
333 struct WebPAnimInfo info;
334 unsigned char *buf = NULL, *bytes = NULL;
335 int ts;
336 const WebPDemuxer *demux;
337 WebPIterator iter;
338 unsigned long flags;
339 unsigned int delay;
340 bool err = false;
341 multi_img_t *m = &img->multi;
342
343 if ((webp_file = fopen(file->path, "rb")) == NULL) {
344 error(0, errno, "%s: Error opening webp image", file->name);
345 return false;
346 }
347 fseek(webp_file, 0L, SEEK_END);
348 data.size = ftell(webp_file);
349 rewind(webp_file);
350 bytes = emalloc(data.size);
351 if ((err = fread(bytes, 1, data.size, webp_file) != data.size)) {
352 error(0, 0, "%s: Error reading webp image", file->name);
353 goto fail;
354 }
355 data.bytes = bytes;
356
357 /* Setup the WebP Animation Decoder */
358 if ((err = !WebPAnimDecoderOptionsInit(&opts))) {
359 error(0, 0, "%s: WebP library version mismatch", file->name);
360 goto fail;
361 }
362 opts.color_mode = MODE_BGRA;
363 /* NOTE: Multi-threaded decoding may cause problems on some system */
364 opts.use_threads = true;
365 dec = WebPAnimDecoderNew(&data, &opts);
366 if ((err = (dec == NULL) || !WebPAnimDecoderGetInfo(dec, &info))) {
367 error(0, 0, "%s: WebP parsing or memory error (file is corrupt?)", file->name);
368 goto fail;
369 }
370 demux = WebPAnimDecoderGetDemuxer(dec);
371
372 /* Get global information for the image */
373 flags = WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS);
374 img->w = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
375 img->h = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
376
377 if (info.frame_count > m->cap) {
378 m->cap = info.frame_count;
379 m->frames = erealloc(m->frames, m->cap * sizeof(*m->frames));
380 }
381
382 /* Load and decode frames (also works on images with only 1 frame) */
383 m->length = m->cnt = m->sel = 0;
384 while (WebPAnimDecoderGetNext(dec, &buf, &ts)) {
385 im = imlib_create_image_using_copied_data(
386 info.canvas_width, info.canvas_height, (uint32_t *)buf);
387 imlib_context_set_image(im);
388 imlib_image_set_format("webp");
389 /* Get an iterator of this frame - used for frame info (duration, etc.) */
390 WebPDemuxGetFrame(demux, m->cnt+1, &iter);
391 imlib_image_set_has_alpha((flags & ALPHA_FLAG) == ALPHA_FLAG);
392 /* Store info for this frame */
393 m->frames[m->cnt].im = im;
394 delay = iter.duration > 0 ? iter.duration : DEF_WEBP_DELAY;
395 m->frames[m->cnt].delay = delay;
396 m->length += m->frames[m->cnt].delay;
397 m->cnt++;
398 }
399 WebPDemuxReleaseIterator(&iter);
400
401 img_multiframe_context_set(img);
402fail:
403 if (dec != NULL)
404 WebPAnimDecoderDelete(dec);
405 free(bytes);
406 fclose(webp_file);
407 return !err;
408}
409#endif /* HAVE_LIBWEBP */
410
411Imlib_Image img_open(const fileinfo_t *file)
412{
413 struct stat st;
414 Imlib_Image im = NULL;
415
416 if (access(file->path, R_OK) == 0 &&
417 stat(file->path, &st) == 0 && S_ISREG(st.st_mode) &&
418 (im = imlib_load_image_immediately(file->path)) != NULL)
419 {
420 imlib_context_set_image(im);
421 }
422 if (im == NULL && (file->flags & FF_WARN))
423 error(0, 0, "%s: Error opening image", file->name);
424 return im;
425}
426
427bool img_load(img_t *img, const fileinfo_t *file)
428{
429 const char *fmt;
430
431 if ((img->im = img_open(file)) == NULL)
432 return false;
433
434 imlib_image_set_changes_on_disk();
435
436/* since v1.7.5, Imlib2 can parse exif orientation from jpeg files.
437 * this version also happens to be the first one which defines the
438 * IMLIB2_VERSION macro.
439 */
440#if HAVE_LIBEXIF && !defined(IMLIB2_VERSION)
441 exif_auto_orientate(file);
442#endif
443
444 if ((fmt = imlib_image_format()) != NULL) { /* NOLINT: fmt might be unused, not worth fixing */
445#if HAVE_LIBGIF
446 if (STREQ(fmt, "gif"))
447 img_load_gif(img, file);
448#endif
449#if HAVE_LIBWEBP
450 if (STREQ(fmt, "webp"))
451 img_load_webp(img, file);
452#endif
453#if HAVE_LIBEXIF && defined(IMLIB2_VERSION)
454 if (!STREQ(fmt, "jpeg") && !STREQ(fmt, "jpg"))
455 exif_auto_orientate(file);
456#endif
457 }
458 img->w = imlib_image_get_width();
459 img->h = imlib_image_get_height();
460 img->checkpan = true;
461 img->dirty = true;
462
463 return true;
464}
465
466CLEANUP void img_close(img_t *img, bool decache)
467{
468 unsigned int i;
469
470 if (img->multi.cnt > 0) {
471 for (i = 0; i < img->multi.cnt; i++) {
472 imlib_context_set_image(img->multi.frames[i].im);
473 imlib_free_image();
474 }
475 img->multi.cnt = 0;
476 img->im = NULL;
477 } else if (img->im != NULL) {
478 imlib_context_set_image(img->im);
479 if (decache)
480 imlib_free_image_and_decache();
481 else
482 imlib_free_image();
483 img->im = NULL;
484 }
485}
486
487static void img_check_pan(img_t *img, bool moved)
488{
489 win_t *win;
490 float w, h, ox, oy;
491
492 win = img->win;
493 w = img->w * img->zoom;
494 h = img->h * img->zoom;
495 ox = img->x;
496 oy = img->y;
497
498 if (w < win->w)
499 img->x = (win->w - w) / 2;
500 else if (img->x > 0)
501 img->x = 0;
502 else if (img->x + w < win->w)
503 img->x = win->w - w;
504 if (h < win->h)
505 img->y = (win->h - h) / 2;
506 else if (img->y > 0)
507 img->y = 0;
508 else if (img->y + h < win->h)
509 img->y = win->h - h;
510
511 if (!moved && (ox != img->x || oy != img->y))
512 img->dirty = true;
513}
514
515static bool img_fit(img_t *img)
516{
517 float z, zw, zh;
518
519 if (img->scalemode == SCALE_ZOOM)
520 return false;
521
522 zw = (float) img->win->w / (float) img->w;
523 zh = (float) img->win->h / (float) img->h;
524
525 switch (img->scalemode) {
526 case SCALE_FILL:
527 z = MAX(zw, zh);
528 break;
529 case SCALE_WIDTH:
530 z = zw;
531 break;
532 case SCALE_HEIGHT:
533 z = zh;
534 break;
535 default:
536 z = MIN(zw, zh);
537 break;
538 }
539 z = MIN(z, img->scalemode == SCALE_DOWN ? 1.0 : ZOOM_MAX);
540
541 if (ABS(img->zoom - z) > 1.0/MAX(img->w, img->h)) {
542 img->zoom = z;
543 img->dirty = title_dirty = true;
544 return true;
545 } else {
546 return false;
547 }
548}
549
550void img_render(img_t *img)
551{
552 win_t *win;
553 int sx, sy, sw, sh;
554 int dx, dy, dw, dh;
555 Imlib_Image bg;
556
557 win = img->win;
558 img_fit(img);
559
560 if (img->checkpan) {
561 img_check_pan(img, false);
562 img->checkpan = false;
563 }
564
565 if (!img->dirty)
566 return;
567
568 /* calculate source and destination offsets:
569 * - part of image drawn on full window, or
570 * - full image drawn on part of window
571 */
572 if (img->x <= 0) {
573 sx = -img->x / img->zoom + 0.5;
574 sw = win->w / img->zoom;
575 dx = 0;
576 dw = win->w;
577 } else {
578 sx = 0;
579 sw = img->w;
580 dx = img->x;
581 dw = MAX(img->w * img->zoom, 1);
582 }
583 if (img->y <= 0) {
584 sy = -img->y / img->zoom + 0.5;
585 sh = win->h / img->zoom;
586 dy = win->bar.top ? win->bar.h : 0;
587 dh = win->h;
588 } else {
589 sy = 0;
590 sh = img->h;
591 dy = img->y + (win->bar.top ? win->bar.h : 0);
592 dh = MAX(img->h * img->zoom, 1);
593 }
594
595 win_clear(win);
596
597 imlib_context_set_image(img->im);
598 imlib_context_set_anti_alias(img->anti_alias);
599 imlib_context_set_drawable(win->buf.pm);
600
601 /* manual blending, for performance reasons.
602 * see https://phab.enlightenment.org/T8969#156167 for more details.
603 */
604 if (imlib_image_has_alpha()) {
605 if ((bg = imlib_create_image(dw, dh)) == NULL) {
606 error(0, ENOMEM, "Failed to create image");
607 goto fallback;
608 }
609 imlib_context_set_image(bg);
610 imlib_image_set_has_alpha(0);
611
612 if (img->alpha) {
613 int i, c, r;
614 uint32_t col[2] = { 0xFF666666, 0xFF999999 };
615 uint32_t *data = imlib_image_get_data();
616
617 for (r = 0; r < dh; r++) {
618 i = r * dw;
619 if (r == 0 || r == 8) {
620 for (c = 0; c < dw; c++)
621 data[i++] = col[!(c & 8) ^ !r];
622 } else {
623 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
624 }
625 }
626 imlib_image_put_back_data(data);
627 } else {
628 XColor c = win->win_bg;
629 imlib_context_set_color(c.red >> 8, c.green >> 8, c.blue >> 8, 0xFF);
630 imlib_image_fill_rectangle(0, 0, dw, dh);
631 }
632 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
633 imlib_context_set_color_modifier(NULL);
634 imlib_render_image_on_drawable(dx, dy);
635 imlib_free_image();
636 imlib_context_set_color_modifier(img->cmod);
637 } else {
638fallback:
639 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
640 }
641 img->dirty = false;
642}
643
644bool img_fit_win(img_t *img, scalemode_t sm)
645{
646 float oz;
647
648 oz = img->zoom;
649 img->scalemode = sm;
650
651 if (img_fit(img)) {
652 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
653 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
654 img->checkpan = true;
655 return true;
656 } else {
657 return false;
658 }
659}
660
661bool img_zoom_to(img_t *img, float z)
662{
663 int x, y;
664 if (ZOOM_MIN <= z && z <= ZOOM_MAX) {
665 win_cursor_pos(img->win, &x, &y);
666 if (x < 0 || (unsigned int)x >= img->win->w ||
667 y < 0 || (unsigned int)y >= img->win->h)
668 {
669 x = img->win->w / 2;
670 y = img->win->h / 2;
671 }
672 img->x = x - (x - img->x) * z / img->zoom;
673 img->y = y - (y - img->y) * z / img->zoom;
674 img->zoom = z;
675 img->scalemode = SCALE_ZOOM;
676 img->dirty = img->checkpan = title_dirty = true;
677 return true;
678 } else {
679 return false;
680 }
681}
682
683bool img_zoom(img_t *img, int d)
684{
685 int i = d > 0 ? 0 : (int)ARRLEN(zoom_levels)-1;
686 while (i >= 0 && i < (int)ARRLEN(zoom_levels) &&
687 (d > 0 ? zoom_levels[i]/100 <= img->zoom : zoom_levels[i]/100 >= img->zoom))
688 {
689 i += d;
690 }
691 i = MIN(MAX(i, 0), (int)ARRLEN(zoom_levels)-1);
692 return img_zoom_to(img, zoom_levels[i]/100);
693}
694
695bool img_pos(img_t *img, float x, float y)
696{
697 float ox, oy;
698
699 ox = img->x;
700 oy = img->y;
701
702 img->x = x;
703 img->y = y;
704
705 img_check_pan(img, true);
706
707 if (ox != img->x || oy != img->y) {
708 img->dirty = true;
709 return true;
710 } else {
711 return false;
712 }
713}
714
715static bool img_move(img_t *img, float dx, float dy)
716{
717 return img_pos(img, img->x + dx, img->y + dy);
718}
719
720bool img_pan(img_t *img, direction_t dir, int d)
721{
722 /* d < 0: screen-wise
723 * d = 0: 1/PAN_FRACTION of screen
724 * d > 0: num of pixels
725 */
726 float x, y;
727
728 if (d > 0) {
729 x = y = MAX(1, (float) d * img->zoom);
730 } else {
731 x = img->win->w / (d < 0 ? 1 : PAN_FRACTION);
732 y = img->win->h / (d < 0 ? 1 : PAN_FRACTION);
733 }
734
735 switch (dir) {
736 case DIR_LEFT:
737 return img_move(img, x, 0.0);
738 case DIR_RIGHT:
739 return img_move(img, -x, 0.0);
740 case DIR_UP:
741 return img_move(img, 0.0, y);
742 case DIR_DOWN:
743 return img_move(img, 0.0, -y);
744 }
745 return false;
746}
747
748bool img_pan_center(img_t *img)
749{
750 float x, y;
751 x = (img->win->w - img->w * img->zoom) / 2.0;
752 y = (img->win->h - img->h * img->zoom) / 2.0;
753 return img_pos(img, x, y);
754}
755
756bool img_pan_edge(img_t *img, direction_t dir)
757{
758 float ox, oy;
759
760 ox = img->x;
761 oy = img->y;
762
763 if (dir & DIR_LEFT)
764 img->x = 0;
765 if (dir & DIR_RIGHT)
766 img->x = img->win->w - img->w * img->zoom;
767 if (dir & DIR_UP)
768 img->y = 0;
769 if (dir & DIR_DOWN)
770 img->y = img->win->h - img->h * img->zoom;
771
772 img_check_pan(img, true);
773
774 if (ox != img->x || oy != img->y) {
775 img->dirty = true;
776 return true;
777 } else {
778 return false;
779 }
780}
781
782void img_rotate(img_t *img, degree_t d)
783{
784 unsigned int i, tmp;
785 float ox, oy;
786
787 imlib_context_set_image(img->im);
788 imlib_image_orientate(d);
789
790 for (i = 0; i < img->multi.cnt; i++) {
791 if (i != img->multi.sel) {
792 imlib_context_set_image(img->multi.frames[i].im);
793 imlib_image_orientate(d);
794 }
795 }
796 if (d == DEGREE_90 || d == DEGREE_270) {
797 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
798 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
799
800 img->x = oy + (img->win->w - img->win->h) / 2;
801 img->y = ox + (img->win->h - img->win->w) / 2;
802
803 tmp = img->w;
804 img->w = img->h;
805 img->h = tmp;
806 img->checkpan = true;
807 }
808 img->dirty = true;
809}
810
811void img_flip(img_t *img, flipdir_t d)
812{
813 unsigned int i;
814 void (*imlib_flip_op[3])(void) = {
815 imlib_image_flip_horizontal,
816 imlib_image_flip_vertical,
817 imlib_image_flip_diagonal
818 };
819
820 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
821
822 if (d < 0 || d >= ARRLEN(imlib_flip_op))
823 return;
824
825 imlib_context_set_image(img->im);
826 imlib_flip_op[d]();
827
828 for (i = 0; i < img->multi.cnt; i++) {
829 if (i != img->multi.sel) {
830 imlib_context_set_image(img->multi.frames[i].im);
831 imlib_flip_op[d]();
832 }
833 }
834 img->dirty = true;
835}
836
837void img_toggle_antialias(img_t *img)
838{
839 img->anti_alias = !img->anti_alias;
840 imlib_context_set_image(img->im);
841 imlib_context_set_anti_alias(img->anti_alias);
842 img->dirty = true;
843}
844
845static double steps_to_range(int d, double max, double offset)
846{
847 return offset + d * ((d <= 0 ? 1.0 : (max - 1.0)) / CC_STEPS);
848}
849
850void img_update_color_modifiers(img_t *img)
851{
852 assert(imlib_context_get_color_modifier() == img->cmod);
853 imlib_reset_color_modifier();
854
855 if (img->gamma != 0)
856 imlib_modify_color_modifier_gamma(steps_to_range(img->gamma, GAMMA_MAX, 1.0));
857 if (img->brightness != 0)
858 imlib_modify_color_modifier_brightness(steps_to_range(img->brightness, BRIGHTNESS_MAX, 0.0));
859 if (img->contrast != 0)
860 imlib_modify_color_modifier_contrast(steps_to_range(img->contrast, CONTRAST_MAX, 1.0));
861
862 img->dirty = true;
863}
864
865bool img_change_color_modifier(img_t *img, int d, int *target)
866{
867 int value = d == 0 ? 0 : MIN(MAX(*target + d, -CC_STEPS), CC_STEPS);
868
869 if (*target == value)
870 return false;
871
872 *target = value;
873 img_update_color_modifiers(img);
874 return true;
875}
876
877static bool img_frame_goto(img_t *img, int n)
878{
879 if (n < 0 || (unsigned int)n >= img->multi.cnt || (unsigned int)n == img->multi.sel)
880 return false;
881
882 img->multi.sel = n;
883 img->im = img->multi.frames[n].im;
884
885 imlib_context_set_image(img->im);
886 img->w = imlib_image_get_width();
887 img->h = imlib_image_get_height();
888 img->checkpan = true;
889 img->dirty = true;
890
891 return true;
892}
893
894bool img_frame_navigate(img_t *img, int d)
895{
896 if (img->multi.cnt == 0 || d == 0)
897 return false;
898
899 d += img->multi.sel;
900 d = MAX(0, MIN(d, (int)img->multi.cnt - 1));
901
902 return img_frame_goto(img, d);
903}
904
905bool img_frame_animate(img_t *img)
906{
907 if (img->multi.cnt > 0)
908 return img_frame_goto(img, (img->multi.sel + 1) % img->multi.cnt);
909 else
910 return false;
911}