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nsxivimage.c

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1/* Copyright 2011, 2012 Bert Muennich
2 *
3 * This file is a part of nsxiv.
4 *
5 * nsxiv is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published
7 * by the Free Software Foundation; either version 2 of the License,
8 * or (at your option) any later version.
9 *
10 * nsxiv is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with nsxiv. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#include "nsxiv.h"
20#define _IMAGE_CONFIG
21#include "config.h"
22
23#include <errno.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/stat.h>
27#include <sys/types.h>
28#include <unistd.h>
29
30#if HAVE_LIBEXIF
31#include <libexif/exif-data.h>
32#endif
33
34#if HAVE_LIBGIF
35#include <gif_lib.h>
36enum { DEF_GIF_DELAY = 75 };
37#endif
38
39#if HAVE_LIBWEBP
40#include <webp/decode.h>
41#include <webp/demux.h>
42enum { DEF_WEBP_DELAY = 75 };
43#endif
44
45void img_init(img_t *img, win_t *win)
46{
47 imlib_context_set_display(win->env.dpy);
48 imlib_context_set_visual(win->env.vis);
49 imlib_context_set_colormap(win->env.cmap);
50
51 img->im = NULL;
52 img->win = win;
53 img->scalemode = options->scalemode;
54 img->zoom = options->zoom;
55 img->zoom = MAX(img->zoom, ZOOM_MIN);
56 img->zoom = MIN(img->zoom, ZOOM_MAX);
57 img->checkpan = false;
58 img->dirty = false;
59 img->aa = ANTI_ALIAS;
60 img->alpha = ALPHA_LAYER;
61 img->multi.cap = img->multi.cnt = 0;
62 img->multi.animate = options->animate;
63 img->multi.framedelay = options->framerate > 0 ? 1000 / options->framerate : 0;
64 img->multi.length = 0;
65
66 img->cmod = imlib_create_color_modifier();
67 imlib_context_set_color_modifier(img->cmod);
68 img_change_gamma(img, options->gamma);
69
70 img->ss.on = options->slideshow > 0;
71 img->ss.delay = options->slideshow > 0 ? options->slideshow : SLIDESHOW_DELAY * 10;
72}
73
74#if HAVE_LIBEXIF
75void exif_auto_orientate(const fileinfo_t *file)
76{
77 ExifData *ed;
78 ExifEntry *entry;
79 int byte_order, orientation = 0;
80
81 if ((ed = exif_data_new_from_file(file->path)) == NULL)
82 return;
83 byte_order = exif_data_get_byte_order(ed);
84 entry = exif_content_get_entry(ed->ifd[EXIF_IFD_0], EXIF_TAG_ORIENTATION);
85 if (entry != NULL)
86 orientation = exif_get_short(entry->data, byte_order);
87 exif_data_unref(ed);
88
89 switch (orientation) {
90 case 5:
91 imlib_image_orientate(1);
92 case 2:
93 imlib_image_flip_vertical();
94 break;
95 case 3:
96 imlib_image_orientate(2);
97 break;
98 case 7:
99 imlib_image_orientate(1);
100 case 4:
101 imlib_image_flip_horizontal();
102 break;
103 case 6:
104 imlib_image_orientate(1);
105 break;
106 case 8:
107 imlib_image_orientate(3);
108 break;
109 }
110}
111#endif
112
113#if HAVE_LIBGIF
114bool img_load_gif(img_t *img, const fileinfo_t *file)
115{
116 GifFileType *gif;
117 GifRowType *rows = NULL;
118 GifRecordType rec;
119 ColorMapObject *cmap;
120 DATA32 bgpixel, *data, *ptr;
121 DATA32 *prev_frame = NULL;
122 Imlib_Image im;
123 int i, j, bg, r, g, b;
124 int x, y, w, h, sw, sh;
125 int px, py, pw, ph;
126 int intoffset[] = { 0, 4, 2, 1 };
127 int intjump[] = { 8, 8, 4, 2 };
128 int transp = -1;
129 unsigned int disposal = 0, prev_disposal = 0;
130 unsigned int delay = 0;
131 bool err = false;
132
133 if (img->multi.cap == 0) {
134 img->multi.cap = 8;
135 img->multi.frames = (img_frame_t*)
136 emalloc(sizeof(img_frame_t) * img->multi.cap);
137 }
138 img->multi.cnt = img->multi.sel = 0;
139 img->multi.length = 0;
140
141#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5
142 gif = DGifOpenFileName(file->path, NULL);
143#else
144 gif = DGifOpenFileName(file->path);
145#endif
146 if (gif == NULL) {
147 error(0, 0, "%s: Error opening gif image", file->name);
148 return false;
149 }
150 bg = gif->SBackGroundColor;
151 sw = gif->SWidth;
152 sh = gif->SHeight;
153 px = py = pw = ph = 0;
154
155 do {
156 if (DGifGetRecordType(gif, &rec) == GIF_ERROR) {
157 err = true;
158 break;
159 }
160 if (rec == EXTENSION_RECORD_TYPE) {
161 int ext_code;
162 GifByteType *ext = NULL;
163
164 DGifGetExtension(gif, &ext_code, &ext);
165 while (ext) {
166 if (ext_code == GRAPHICS_EXT_FUNC_CODE) {
167 if (ext[1] & 1)
168 transp = (int) ext[4];
169 else
170 transp = -1;
171
172 delay = 10 * ((unsigned int) ext[3] << 8 | (unsigned int) ext[2]);
173 disposal = (unsigned int) ext[1] >> 2 & 0x7;
174 }
175 ext = NULL;
176 DGifGetExtensionNext(gif, &ext);
177 }
178 } else if (rec == IMAGE_DESC_RECORD_TYPE) {
179 if (DGifGetImageDesc(gif) == GIF_ERROR) {
180 err = true;
181 break;
182 }
183 x = gif->Image.Left;
184 y = gif->Image.Top;
185 w = gif->Image.Width;
186 h = gif->Image.Height;
187
188 rows = (GifRowType*) emalloc(h * sizeof(GifRowType));
189 for (i = 0; i < h; i++)
190 rows[i] = (GifRowType) emalloc(w * sizeof(GifPixelType));
191 if (gif->Image.Interlace) {
192 for (i = 0; i < 4; i++) {
193 for (j = intoffset[i]; j < h; j += intjump[i])
194 DGifGetLine(gif, rows[j], w);
195 }
196 } else {
197 for (i = 0; i < h; i++)
198 DGifGetLine(gif, rows[i], w);
199 }
200
201 ptr = data = (DATA32*) emalloc(sizeof(DATA32) * sw * sh);
202 cmap = gif->Image.ColorMap ? gif->Image.ColorMap : gif->SColorMap;
203 if (bg >= cmap->ColorCount) {
204 err = true;
205 break;
206 }
207 r = cmap->Colors[bg].Red;
208 g = cmap->Colors[bg].Green;
209 b = cmap->Colors[bg].Blue;
210 bgpixel = 0x00ffffff & (r << 16 | g << 8 | b);
211
212 for (i = 0; i < sh; i++) {
213 for (j = 0; j < sw; j++) {
214 if (i < y || i >= y + h || j < x || j >= x + w ||
215 rows[i-y][j-x] == transp)
216 {
217 if (prev_frame != NULL && (prev_disposal != 2 ||
218 i < py || i >= py + ph || j < px || j >= px + pw))
219 {
220 *ptr = prev_frame[i * sw + j];
221 } else {
222 *ptr = bgpixel;
223 }
224 } else {
225 r = cmap->Colors[rows[i-y][j-x]].Red;
226 g = cmap->Colors[rows[i-y][j-x]].Green;
227 b = cmap->Colors[rows[i-y][j-x]].Blue;
228 *ptr = 0xffu << 24 | r << 16 | g << 8 | b;
229 }
230 ptr++;
231 }
232 }
233
234 im = imlib_create_image_using_copied_data(sw, sh, data);
235
236 for (i = 0; i < h; i++)
237 free(rows[i]);
238 free(rows);
239 free(data);
240
241 if (im == NULL) {
242 err = true;
243 break;
244 }
245
246 imlib_context_set_image(im);
247 imlib_image_set_format("gif");
248 if (transp >= 0)
249 imlib_image_set_has_alpha(1);
250
251 if (disposal != 3)
252 prev_frame = imlib_image_get_data_for_reading_only();
253 prev_disposal = disposal;
254 px = x, py = y, pw = w, ph = h;
255
256 if (img->multi.cnt == img->multi.cap) {
257 img->multi.cap *= 2;
258 img->multi.frames = (img_frame_t*)
259 erealloc(img->multi.frames,
260 img->multi.cap * sizeof(img_frame_t));
261 }
262 img->multi.frames[img->multi.cnt].im = im;
263 delay = img->multi.framedelay > 0 ? img->multi.framedelay : delay;
264 img->multi.frames[img->multi.cnt].delay = delay > 0 ? delay : DEF_GIF_DELAY;
265 img->multi.length += img->multi.frames[img->multi.cnt].delay;
266 img->multi.cnt++;
267 }
268 } while (rec != TERMINATE_RECORD_TYPE);
269
270#if defined(GIFLIB_MAJOR) && GIFLIB_MAJOR >= 5 && GIFLIB_MINOR >= 1
271 DGifCloseFile(gif, NULL);
272#else
273 DGifCloseFile(gif);
274#endif
275
276 if (err && (file->flags & FF_WARN))
277 error(0, 0, "%s: Corrupted gif file", file->name);
278
279 if (img->multi.cnt > 1) {
280 imlib_context_set_image(img->im);
281 imlib_free_image();
282 img->im = img->multi.frames[0].im;
283 } else if (img->multi.cnt == 1) {
284 imlib_context_set_image(img->multi.frames[0].im);
285 imlib_free_image();
286 img->multi.cnt = 0;
287 }
288
289 imlib_context_set_image(img->im);
290
291 return !err;
292}
293#endif /* HAVE_LIBGIF */
294
295
296#if HAVE_LIBWEBP
297bool is_webp(const char *path)
298{
299 /* The size (in bytes) of the largest amount of data required to verify a WebP image. */
300 enum { max = 30 };
301 const unsigned char fmt[max];
302 bool ret = false;
303 FILE *f;
304
305 if ((f = fopen(path, "rb")) != NULL) {
306 if (fread((unsigned char *) fmt, 1, max, f) == max)
307 ret = WebPGetInfo(fmt, max, NULL, NULL);
308 fclose(f);
309 }
310 return ret;
311}
312
313/* fframe img
314 * NULL NULL = do nothing
315 * x NULL = load the first frame as an Imlib_Image
316 * NULL x = load all frames into img->multi.
317 */
318bool img_load_webp(const fileinfo_t *file, Imlib_Image *fframe, img_t *img)
319{
320 FILE *webp_file;
321 WebPData data;
322 data.bytes = NULL;
323
324 Imlib_Image im = NULL;
325 struct WebPAnimDecoderOptions opts;
326 WebPAnimDecoder *dec = NULL;
327 struct WebPAnimInfo info;
328 unsigned char *buf = NULL;
329 int ts;
330 const WebPDemuxer *demux;
331 WebPIterator iter;
332 unsigned long flags;
333 unsigned int delay;
334 bool err = false;
335
336 if ((err = fframe == NULL && img == NULL))
337 goto fail;
338
339 if ((err = (webp_file = fopen(file->path, "rb")) == NULL)) {
340 error(0, 0, "%s: Error opening webp image", file->name);
341 goto fail;
342 }
343 fseek(webp_file, 0L, SEEK_END);
344 data.size = ftell(webp_file);
345 rewind(webp_file);
346 data.bytes = emalloc(data.size);
347 if ((err = fread((unsigned char *)data.bytes, 1, data.size, webp_file) != data.size)) {
348 error(0, 0, "%s: Error reading webp image", file->name);
349 goto fail;
350 }
351
352 /* Setup the WebP Animation Decoder */
353 if ((err = !WebPAnimDecoderOptionsInit(&opts))) {
354 error(0, 0, "%s: WebP library version mismatch", file->name);
355 goto fail;
356 }
357 opts.color_mode = MODE_BGRA;
358 /* NOTE: Multi-threaded decoding may cause problems on some system */
359 opts.use_threads = true;
360 dec = WebPAnimDecoderNew(&data, &opts);
361 if ((err = (dec == NULL) || !WebPAnimDecoderGetInfo(dec, &info))) {
362 error(0, 0, "%s: WebP parsing or memory error (file is corrupt?)", file->name);
363 goto fail;
364 }
365 demux = WebPAnimDecoderGetDemuxer(dec);
366
367 if (img == NULL) { /* Only get the first frame and put it into fframe. */
368 if ((err = !WebPAnimDecoderGetNext(dec, &buf, &ts))) {
369 error(0, 0, "%s: Error loading first frame", file->name);
370 goto fail;
371 }
372 *fframe = imlib_create_image_using_copied_data(
373 info.canvas_width, info.canvas_height, (DATA32*)buf);
374 imlib_context_set_image(*fframe);
375 imlib_image_set_has_alpha(WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS) & ALPHA_FLAG);
376 } else {
377 /* Get global information for the image */
378 flags = WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS);
379 img->w = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
380 img->h = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
381 img->multi.cap = info.frame_count;
382 img->multi.sel = 0;
383 img->multi.frames = emalloc(info.frame_count * sizeof(img_frame_t));
384
385 /* Load and decode frames (also works on images with only 1 frame) */
386 img->multi.cnt = 0;
387 while (WebPAnimDecoderGetNext(dec, &buf, &ts)) {
388 im = imlib_create_image_using_copied_data(
389 info.canvas_width, info.canvas_height, (DATA32*)buf);
390 imlib_context_set_image(im);
391 imlib_image_set_format("webp");
392 /* Get an iterator of this frame - used for frame info (duration, etc.) */
393 WebPDemuxGetFrame(demux, img->multi.cnt+1, &iter);
394 imlib_image_set_has_alpha((flags & ALPHA_FLAG) == ALPHA_FLAG);
395 /* Store info for this frame */
396 img->multi.frames[img->multi.cnt].im = im;
397 delay = iter.duration > 0 ? iter.duration : DEF_WEBP_DELAY;
398 img->multi.frames[img->multi.cnt].delay = delay;
399 img->multi.length += img->multi.frames[img->multi.cnt].delay;
400 img->multi.cnt++;
401 }
402 WebPDemuxReleaseIterator(&iter);
403
404 if (img->multi.cnt > 1) {
405 imlib_context_set_image(img->im);
406 imlib_free_image();
407 img->im = img->multi.frames[0].im;
408 } else if (img->multi.cnt == 1) {
409 imlib_context_set_image(img->multi.frames[0].im);
410 imlib_free_image();
411 img->multi.cnt = 0;
412 }
413 imlib_context_set_image(img->im);
414 }
415 imlib_image_set_format("webp");
416fail:
417 if (dec != NULL)
418 WebPAnimDecoderDelete(dec);
419 free((unsigned char *)data.bytes);
420 return !err;
421}
422#endif /* HAVE_LIBWEBP */
423
424Imlib_Image img_open(const fileinfo_t *file)
425{
426 struct stat st;
427 Imlib_Image im = NULL;
428
429 if (access(file->path, R_OK) == 0 &&
430 stat(file->path, &st) == 0 && S_ISREG(st.st_mode))
431 {
432#if HAVE_LIBWEBP
433 if (is_webp(file->path))
434 img_load_webp(file, &im, NULL);
435 else
436#endif
437 im = imlib_load_image(file->path);
438 if (im != NULL) {
439 imlib_context_set_image(im);
440#if HAVE_LIBWEBP
441 const char *fmt;
442 if ((fmt = imlib_image_format()) != NULL && !STREQ(fmt, "webp") &&
443 imlib_image_get_data_for_reading_only() == NULL) {
444#else
445 if (imlib_image_get_data_for_reading_only() == NULL) {
446#endif
447 imlib_free_image();
448 im = NULL;
449 }
450 }
451 }
452 if (im == NULL && (file->flags & FF_WARN))
453 error(0, 0, "%s: Error opening image", file->name);
454 return im;
455}
456
457bool img_load(img_t *img, const fileinfo_t *file)
458{
459 const char *fmt;
460
461 if ((img->im = img_open(file)) == NULL)
462 return false;
463
464 imlib_image_set_changes_on_disk();
465
466#if HAVE_LIBEXIF
467 exif_auto_orientate(file);
468#endif
469
470 if ((fmt = imlib_image_format()) != NULL) {
471#if HAVE_LIBGIF
472 if (STREQ(fmt, "gif"))
473 img_load_gif(img, file);
474#endif
475#if HAVE_LIBWEBP
476 if (STREQ(fmt, "webp"))
477 img_load_webp(file, NULL, img);
478#endif
479 }
480 img->w = imlib_image_get_width();
481 img->h = imlib_image_get_height();
482 img->checkpan = true;
483 img->dirty = true;
484
485 return true;
486}
487
488CLEANUP void img_close(img_t *img, bool decache)
489{
490 int i;
491
492 if (img->multi.cnt > 0) {
493 for (i = 0; i < img->multi.cnt; i++) {
494 imlib_context_set_image(img->multi.frames[i].im);
495 imlib_free_image();
496 }
497 img->multi.cnt = 0;
498 img->im = NULL;
499 } else if (img->im != NULL) {
500 imlib_context_set_image(img->im);
501 if (decache)
502 imlib_free_image_and_decache();
503 else
504 imlib_free_image();
505 img->im = NULL;
506 }
507}
508
509void img_check_pan(img_t *img, bool moved)
510{
511 win_t *win;
512 float w, h, ox, oy;
513
514 win = img->win;
515 w = img->w * img->zoom;
516 h = img->h * img->zoom;
517 ox = img->x;
518 oy = img->y;
519
520 if (w < win->w)
521 img->x = (win->w - w) / 2;
522 else if (img->x > 0)
523 img->x = 0;
524 else if (img->x + w < win->w)
525 img->x = win->w - w;
526 if (h < win->h)
527 img->y = (win->h - h) / 2;
528 else if (img->y > 0)
529 img->y = 0;
530 else if (img->y + h < win->h)
531 img->y = win->h - h;
532
533 if (!moved && (ox != img->x || oy != img->y))
534 img->dirty = true;
535}
536
537bool img_fit(img_t *img)
538{
539 float z, zw, zh;
540
541 if (img->scalemode == SCALE_ZOOM)
542 return false;
543
544 zw = (float) img->win->w / (float) img->w;
545 zh = (float) img->win->h / (float) img->h;
546
547 switch (img->scalemode) {
548 case SCALE_FILL:
549 z = MAX(zw, zh);
550 break;
551 case SCALE_WIDTH:
552 z = zw;
553 break;
554 case SCALE_HEIGHT:
555 z = zh;
556 break;
557 default:
558 z = MIN(zw, zh);
559 break;
560 }
561 z = MIN(z, img->scalemode == SCALE_DOWN ? 1.0 : ZOOM_MAX);
562
563 if (ABS(img->zoom - z) > 1.0/MAX(img->w, img->h)) {
564 img->zoom = z;
565 img->dirty = true;
566 return true;
567 } else {
568 return false;
569 }
570}
571
572void img_render(img_t *img)
573{
574 win_t *win;
575 int sx, sy, sw, sh;
576 int dx, dy, dw, dh;
577 Imlib_Image bg;
578 unsigned long c;
579
580 win = img->win;
581 img_fit(img);
582
583 if (img->checkpan) {
584 img_check_pan(img, false);
585 img->checkpan = false;
586 }
587
588 if (!img->dirty)
589 return;
590
591 /* calculate source and destination offsets:
592 * - part of image drawn on full window, or
593 * - full image drawn on part of window
594 */
595 if (img->x <= 0) {
596 sx = -img->x / img->zoom + 0.5;
597 sw = win->w / img->zoom;
598 dx = 0;
599 dw = win->w;
600 } else {
601 sx = 0;
602 sw = img->w;
603 dx = img->x;
604 dw = img->w * img->zoom;
605 }
606 if (img->y <= 0) {
607 sy = -img->y / img->zoom + 0.5;
608 sh = win->h / img->zoom;
609 dy = 0;
610 dh = win->h;
611 } else {
612 sy = 0;
613 sh = img->h;
614 dy = img->y;
615 dh = img->h * img->zoom;
616 }
617
618 win_clear(win);
619
620 imlib_context_set_image(img->im);
621 imlib_context_set_anti_alias(img->aa);
622 imlib_context_set_drawable(win->buf.pm);
623
624 if (imlib_image_has_alpha()) {
625 if ((bg = imlib_create_image(dw, dh)) == NULL)
626 error(EXIT_FAILURE, ENOMEM, NULL);
627 imlib_context_set_image(bg);
628 imlib_image_set_has_alpha(1);
629
630 if (img->alpha) {
631 int i, c, r;
632 DATA32 col[2] = { 0xFF666666, 0xFF999999 };
633 DATA32 * data = imlib_image_get_data();
634
635 for (r = 0; r < dh; r++) {
636 i = r * dw;
637 if (r == 0 || r == 8) {
638 for (c = 0; c < dw; c++)
639 data[i++] = col[!(c & 8) ^ !r];
640 } else {
641 memcpy(&data[i], &data[(r & 8) * dw], dw * sizeof(data[0]));
642 }
643 }
644 imlib_image_put_back_data(data);
645 } else {
646 c = win->win_bg;
647 imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
648 imlib_image_fill_rectangle(0, 0, dw, dh);
649 }
650 imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);
651 imlib_context_set_color_modifier(NULL);
652 imlib_render_image_on_drawable(dx, dy);
653 imlib_free_image();
654 imlib_context_set_color_modifier(img->cmod);
655 } else {
656 imlib_image_set_has_alpha(1);
657 imlib_render_image_part_on_drawable_at_size(sx, sy, sw, sh, dx, dy, dw, dh);
658 }
659 img->dirty = false;
660}
661
662bool img_fit_win(img_t *img, scalemode_t sm)
663{
664 float oz;
665
666 oz = img->zoom;
667 img->scalemode = sm;
668
669 if (img_fit(img)) {
670 img->x = img->win->w / 2 - (img->win->w / 2 - img->x) * img->zoom / oz;
671 img->y = img->win->h / 2 - (img->win->h / 2 - img->y) * img->zoom / oz;
672 img->checkpan = true;
673 return true;
674 } else {
675 return false;
676 }
677}
678
679bool img_zoom_to(img_t *img, float z)
680{
681 int x, y;
682 if (ZOOM_MIN <= z && z <= ZOOM_MAX) {
683 win_cursor_pos(img->win, &x, &y);
684 if (x < 0 || x >= img->win->w || y < 0 || y >= img->win->h) {
685 x = img->win->w / 2;
686 y = img->win->h / 2;
687 }
688 img->x = x - (x - img->x) * z / img->zoom;
689 img->y = y - (y - img->y) * z / img->zoom;
690 img->zoom = z;
691 img->scalemode = SCALE_ZOOM;
692 img->checkpan = true;
693 img->dirty = true;
694 return true;
695 } else {
696 return false;
697 }
698}
699
700bool img_zoom(img_t *img, int d)
701{
702 const float z = img->zoom * (d > 0 ? ZOOM_STEP : 1/ZOOM_STEP);
703 return img_zoom_to(img, z);
704}
705
706bool img_pos(img_t *img, float x, float y)
707{
708 float ox, oy;
709
710 ox = img->x;
711 oy = img->y;
712
713 img->x = x;
714 img->y = y;
715
716 img_check_pan(img, true);
717
718 if (ox != img->x || oy != img->y) {
719 img->dirty = true;
720 return true;
721 } else {
722 return false;
723 }
724}
725
726bool img_move(img_t *img, float dx, float dy)
727{
728 return img_pos(img, img->x + dx, img->y + dy);
729}
730
731bool img_pan(img_t *img, direction_t dir, int d)
732{
733 /* d < 0: screen-wise
734 * d = 0: 1/PAN_FRACTION of screen
735 * d > 0: num of pixels
736 */
737 float x, y;
738
739 if (d > 0) {
740 x = y = MAX(1, (float) d * img->zoom);
741 } else {
742 x = img->win->w / (d < 0 ? 1 : PAN_FRACTION);
743 y = img->win->h / (d < 0 ? 1 : PAN_FRACTION);
744 }
745
746 switch (dir) {
747 case DIR_LEFT:
748 return img_move(img, x, 0.0);
749 case DIR_RIGHT:
750 return img_move(img, -x, 0.0);
751 case DIR_UP:
752 return img_move(img, 0.0, y);
753 case DIR_DOWN:
754 return img_move(img, 0.0, -y);
755 }
756 return false;
757}
758
759bool img_pan_edge(img_t *img, direction_t dir)
760{
761 float ox, oy;
762
763 ox = img->x;
764 oy = img->y;
765
766 if (dir & DIR_LEFT)
767 img->x = 0;
768 if (dir & DIR_RIGHT)
769 img->x = img->win->w - img->w * img->zoom;
770 if (dir & DIR_UP)
771 img->y = 0;
772 if (dir & DIR_DOWN)
773 img->y = img->win->h - img->h * img->zoom;
774
775 img_check_pan(img, true);
776
777 if (ox != img->x || oy != img->y) {
778 img->dirty = true;
779 return true;
780 } else {
781 return false;
782 }
783}
784
785void img_rotate(img_t *img, degree_t d)
786{
787 int i, tmp;
788 float ox, oy;
789
790 imlib_context_set_image(img->im);
791 imlib_image_orientate(d);
792
793 for (i = 0; i < img->multi.cnt; i++) {
794 if (i != img->multi.sel) {
795 imlib_context_set_image(img->multi.frames[i].im);
796 imlib_image_orientate(d);
797 }
798 }
799 if (d == DEGREE_90 || d == DEGREE_270) {
800 ox = d == DEGREE_90 ? img->x : img->win->w - img->x - img->w * img->zoom;
801 oy = d == DEGREE_270 ? img->y : img->win->h - img->y - img->h * img->zoom;
802
803 img->x = oy + (img->win->w - img->win->h) / 2;
804 img->y = ox + (img->win->h - img->win->w) / 2;
805
806 tmp = img->w;
807 img->w = img->h;
808 img->h = tmp;
809 img->checkpan = true;
810 }
811 img->dirty = true;
812}
813
814void img_flip(img_t *img, flipdir_t d)
815{
816 int i;
817 void (*imlib_flip_op[3])(void) = {
818 imlib_image_flip_horizontal,
819 imlib_image_flip_vertical,
820 imlib_image_flip_diagonal
821 };
822
823 d = (d & (FLIP_HORIZONTAL | FLIP_VERTICAL)) - 1;
824
825 if (d < 0 || d >= ARRLEN(imlib_flip_op))
826 return;
827
828 imlib_context_set_image(img->im);
829 imlib_flip_op[d]();
830
831 for (i = 0; i < img->multi.cnt; i++) {
832 if (i != img->multi.sel) {
833 imlib_context_set_image(img->multi.frames[i].im);
834 imlib_flip_op[d]();
835 }
836 }
837 img->dirty = true;
838}
839
840void img_toggle_antialias(img_t *img)
841{
842 img->aa = !img->aa;
843 imlib_context_set_image(img->im);
844 imlib_context_set_anti_alias(img->aa);
845 img->dirty = true;
846}
847
848bool img_change_gamma(img_t *img, int d)
849{
850 /* d < 0: decrease gamma
851 * d = 0: reset gamma
852 * d > 0: increase gamma
853 */
854 int gamma;
855 double range;
856
857 if (d == 0)
858 gamma = 0;
859 else
860 gamma = MIN(MAX(img->gamma + d, -GAMMA_RANGE), GAMMA_RANGE);
861
862 if (img->gamma != gamma) {
863 imlib_reset_color_modifier();
864 if (gamma != 0) {
865 range = gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0;
866 imlib_modify_color_modifier_gamma(1.0 + gamma * (range / GAMMA_RANGE));
867 }
868 img->gamma = gamma;
869 img->dirty = true;
870 return true;
871 } else {
872 return false;
873 }
874}
875
876bool img_frame_goto(img_t *img, int n)
877{
878 if (n < 0 || n >= img->multi.cnt || n == img->multi.sel)
879 return false;
880
881 img->multi.sel = n;
882 img->im = img->multi.frames[n].im;
883
884 imlib_context_set_image(img->im);
885 img->w = imlib_image_get_width();
886 img->h = imlib_image_get_height();
887 img->checkpan = true;
888 img->dirty = true;
889
890 return true;
891}
892
893bool img_frame_navigate(img_t *img, int d)
894{
895 if (img->multi.cnt == 0 || d == 0)
896 return false;
897
898 d += img->multi.sel;
899 if (d < 0)
900 d = 0;
901 else if (d >= img->multi.cnt)
902 d = img->multi.cnt - 1;
903
904 return img_frame_goto(img, d);
905}
906
907bool img_frame_animate(img_t *img)
908{
909 if (img->multi.cnt == 0)
910 return false;
911
912 if (img->multi.sel + 1 >= img->multi.cnt)
913 img_frame_goto(img, 0);
914 else
915 img_frame_goto(img, img->multi.sel + 1);
916 img->dirty = true;
917 return true;
918}
919