1 #include "gifdec.h"
2 #include "../../../misc/lv_log.h"
3 #include "../../../misc/lv_mem.h"
4 #include "../../../misc/lv_color.h"
5 #if LV_USE_GIF
6
7 #include <stdlib.h>
8 #include <string.h>
9 #include <stdbool.h>
10
11 #define MIN(A, B) ((A) < (B) ? (A) : (B))
12 #define MAX(A, B) ((A) > (B) ? (A) : (B))
13
14 typedef struct Entry {
15 uint16_t length;
16 uint16_t prefix;
17 uint8_t suffix;
18 } Entry;
19
20 typedef struct Table {
21 int bulk;
22 int nentries;
23 Entry *entries;
24 } Table;
25
26 static gd_GIF * gif_open(gd_GIF * gif);
27 static bool f_gif_open(gd_GIF * gif, const void * path, bool is_file);
28 static void f_gif_read(gd_GIF * gif, void * buf, size_t len);
29 static int f_gif_seek(gd_GIF * gif, size_t pos, int k);
30 static void f_gif_close(gd_GIF * gif);
31
32 static uint16_t
read_num(gd_GIF * gif)33 read_num(gd_GIF * gif)
34 {
35 uint8_t bytes[2];
36
37 f_gif_read(gif, bytes, 2);
38 return bytes[0] + (((uint16_t) bytes[1]) << 8);
39 }
40
41
42
43 gd_GIF *
gd_open_gif_file(const char * fname)44 gd_open_gif_file(const char *fname)
45 {
46 gd_GIF gif_base;
47 memset(&gif_base, 0, sizeof(gif_base));
48
49 bool res = f_gif_open(&gif_base, fname, true);
50 if(!res) return NULL;
51
52 return gif_open(&gif_base);
53 }
54
55
56 gd_GIF *
gd_open_gif_data(const void * data)57 gd_open_gif_data(const void *data)
58 {
59 gd_GIF gif_base;
60 memset(&gif_base, 0, sizeof(gif_base));
61
62 bool res = f_gif_open(&gif_base, data, false);
63 if(!res) return NULL;
64
65 return gif_open(&gif_base);
66 }
67
gif_open(gd_GIF * gif_base)68 static gd_GIF * gif_open(gd_GIF * gif_base)
69 {
70 uint8_t sigver[3];
71 uint16_t width, height, depth;
72 uint8_t fdsz, bgidx, aspect;
73 int i;
74 uint8_t *bgcolor;
75 int gct_sz;
76 gd_GIF *gif = NULL;
77
78 /* Header */
79 f_gif_read(gif_base, sigver, 3);
80 if (memcmp(sigver, "GIF", 3) != 0) {
81 LV_LOG_WARN("invalid signature\n");
82 goto fail;
83 }
84 /* Version */
85 f_gif_read(gif_base, sigver, 3);
86 if (memcmp(sigver, "89a", 3) != 0) {
87 LV_LOG_WARN("invalid version\n");
88 goto fail;
89 }
90 /* Width x Height */
91 width = read_num(gif_base);
92 height = read_num(gif_base);
93 /* FDSZ */
94 f_gif_read(gif_base, &fdsz, 1);
95 /* Presence of GCT */
96 if (!(fdsz & 0x80)) {
97 LV_LOG_WARN("no global color table\n");
98 goto fail;
99 }
100 /* Color Space's Depth */
101 depth = ((fdsz >> 4) & 7) + 1;
102 /* Ignore Sort Flag. */
103 /* GCT Size */
104 gct_sz = 1 << ((fdsz & 0x07) + 1);
105 /* Background Color Index */
106 f_gif_read(gif_base, &bgidx, 1);
107 /* Aspect Ratio */
108 f_gif_read(gif_base, &aspect, 1);
109 /* Create gd_GIF Structure. */
110 #if LV_COLOR_DEPTH == 32
111 gif = lv_mem_alloc(sizeof(gd_GIF) + 5 * width * height);
112 #elif LV_COLOR_DEPTH == 16
113 gif = lv_mem_alloc(sizeof(gd_GIF) + 4 * width * height);
114 #elif LV_COLOR_DEPTH == 8 || LV_COLOR_DEPTH == 1
115 gif = lv_mem_alloc(sizeof(gd_GIF) + 3 * width * height);
116 #endif
117
118 if (!gif) goto fail;
119 memcpy(gif, gif_base, sizeof(gd_GIF));
120 gif->width = width;
121 gif->height = height;
122 gif->depth = depth;
123 /* Read GCT */
124 gif->gct.size = gct_sz;
125 f_gif_read(gif, gif->gct.colors, 3 * gif->gct.size);
126 gif->palette = &gif->gct;
127 gif->bgindex = bgidx;
128 gif->canvas = (uint8_t *) &gif[1];
129 #if LV_COLOR_DEPTH == 32
130 gif->frame = &gif->canvas[4 * width * height];
131 #elif LV_COLOR_DEPTH == 16
132 gif->frame = &gif->canvas[3 * width * height];
133 #elif LV_COLOR_DEPTH == 8 || LV_COLOR_DEPTH == 1
134 gif->frame = &gif->canvas[2 * width * height];
135 #endif
136 if (gif->bgindex) {
137 memset(gif->frame, gif->bgindex, gif->width * gif->height);
138 }
139 bgcolor = &gif->palette->colors[gif->bgindex*3];
140
141 for (i = 0; i < gif->width * gif->height; i++) {
142 #if LV_COLOR_DEPTH == 32
143 gif->canvas[i*4 + 0] = *(bgcolor + 2);
144 gif->canvas[i*4 + 1] = *(bgcolor + 1);
145 gif->canvas[i*4 + 2] = *(bgcolor + 0);
146 gif->canvas[i*4 + 3] = 0xff;
147 #elif LV_COLOR_DEPTH == 16
148 lv_color_t c = lv_color_make(*(bgcolor + 0), *(bgcolor + 1), *(bgcolor + 2));
149 gif->canvas[i*3 + 0] = c.full & 0xff;
150 gif->canvas[i*3 + 1] = (c.full >> 8) & 0xff;
151 gif->canvas[i*3 + 2] = 0xff;
152 #elif LV_COLOR_DEPTH == 8
153 lv_color_t c = lv_color_make(*(bgcolor + 0), *(bgcolor + 1), *(bgcolor + 2));
154 gif->canvas[i*2 + 0] = c.full;
155 gif->canvas[i*2 + 1] = 0xff;
156 #elif LV_COLOR_DEPTH == 1
157 lv_color_t c = lv_color_make(*(bgcolor + 0), *(bgcolor + 1), *(bgcolor + 2));
158 gif->canvas[i*2 + 0] = c.ch.red > 128 ? 1 : 0;
159 gif->canvas[i*2 + 1] = 0xff;
160 #endif
161 }
162 gif->anim_start = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
163 gif->loop_count = -1;
164 goto ok;
165 fail:
166 f_gif_close(gif_base);
167 ok:
168 return gif;
169 }
170
171 static void
discard_sub_blocks(gd_GIF * gif)172 discard_sub_blocks(gd_GIF *gif)
173 {
174 uint8_t size;
175
176 do {
177 f_gif_read(gif, &size, 1);
178 f_gif_seek(gif, size, LV_FS_SEEK_CUR);
179 } while (size);
180 }
181
182 static void
read_plain_text_ext(gd_GIF * gif)183 read_plain_text_ext(gd_GIF *gif)
184 {
185 if (gif->plain_text) {
186 uint16_t tx, ty, tw, th;
187 uint8_t cw, ch, fg, bg;
188 size_t sub_block;
189 f_gif_seek(gif, 1, LV_FS_SEEK_CUR); /* block size = 12 */
190 tx = read_num(gif);
191 ty = read_num(gif);
192 tw = read_num(gif);
193 th = read_num(gif);
194 f_gif_read(gif, &cw, 1);
195 f_gif_read(gif, &ch, 1);
196 f_gif_read(gif, &fg, 1);
197 f_gif_read(gif, &bg, 1);
198 sub_block = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
199 gif->plain_text(gif, tx, ty, tw, th, cw, ch, fg, bg);
200 f_gif_seek(gif, sub_block, LV_FS_SEEK_SET);
201 } else {
202 /* Discard plain text metadata. */
203 f_gif_seek(gif, 13, LV_FS_SEEK_CUR);
204 }
205 /* Discard plain text sub-blocks. */
206 discard_sub_blocks(gif);
207 }
208
209 static void
read_graphic_control_ext(gd_GIF * gif)210 read_graphic_control_ext(gd_GIF *gif)
211 {
212 uint8_t rdit;
213
214 /* Discard block size (always 0x04). */
215 f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
216 f_gif_read(gif, &rdit, 1);
217 gif->gce.disposal = (rdit >> 2) & 3;
218 gif->gce.input = rdit & 2;
219 gif->gce.transparency = rdit & 1;
220 gif->gce.delay = read_num(gif);
221 f_gif_read(gif, &gif->gce.tindex, 1);
222 /* Skip block terminator. */
223 f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
224 }
225
226 static void
read_comment_ext(gd_GIF * gif)227 read_comment_ext(gd_GIF *gif)
228 {
229 if (gif->comment) {
230 size_t sub_block = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
231 gif->comment(gif);
232 f_gif_seek(gif, sub_block, LV_FS_SEEK_SET);
233 }
234 /* Discard comment sub-blocks. */
235 discard_sub_blocks(gif);
236 }
237
238 static void
read_application_ext(gd_GIF * gif)239 read_application_ext(gd_GIF *gif)
240 {
241 char app_id[8];
242 char app_auth_code[3];
243 uint16_t loop_count;
244
245 /* Discard block size (always 0x0B). */
246 f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
247 /* Application Identifier. */
248 f_gif_read(gif, app_id, 8);
249 /* Application Authentication Code. */
250 f_gif_read(gif, app_auth_code, 3);
251 if (!strncmp(app_id, "NETSCAPE", sizeof(app_id))) {
252 /* Discard block size (0x03) and constant byte (0x01). */
253 f_gif_seek(gif, 2, LV_FS_SEEK_CUR);
254 loop_count = read_num(gif);
255 if(gif->loop_count < 0) {
256 if(loop_count == 0) {
257 gif->loop_count = 0;
258 }
259 else{
260 gif->loop_count = loop_count + 1;
261 }
262 }
263 /* Skip block terminator. */
264 f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
265 } else if (gif->application) {
266 size_t sub_block = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
267 gif->application(gif, app_id, app_auth_code);
268 f_gif_seek(gif, sub_block, LV_FS_SEEK_SET);
269 discard_sub_blocks(gif);
270 } else {
271 discard_sub_blocks(gif);
272 }
273 }
274
275 static void
read_ext(gd_GIF * gif)276 read_ext(gd_GIF *gif)
277 {
278 uint8_t label;
279
280 f_gif_read(gif, &label, 1);
281 switch (label) {
282 case 0x01:
283 read_plain_text_ext(gif);
284 break;
285 case 0xF9:
286 read_graphic_control_ext(gif);
287 break;
288 case 0xFE:
289 read_comment_ext(gif);
290 break;
291 case 0xFF:
292 read_application_ext(gif);
293 break;
294 default:
295 LV_LOG_WARN("unknown extension: %02X\n", label);
296 }
297 }
298
299 static Table *
new_table(int key_size)300 new_table(int key_size)
301 {
302 int key;
303 int init_bulk = MAX(1 << (key_size + 1), 0x100);
304 Table *table = lv_mem_alloc(sizeof(*table) + sizeof(Entry) * init_bulk);
305 if (table) {
306 table->bulk = init_bulk;
307 table->nentries = (1 << key_size) + 2;
308 table->entries = (Entry *) &table[1];
309 for (key = 0; key < (1 << key_size); key++)
310 table->entries[key] = (Entry) {1, 0xFFF, key};
311 }
312 return table;
313 }
314
315 /* Add table entry. Return value:
316 * 0 on success
317 * +1 if key size must be incremented after this addition
318 * -1 if could not realloc table */
319 static int
add_entry(Table ** tablep,uint16_t length,uint16_t prefix,uint8_t suffix)320 add_entry(Table **tablep, uint16_t length, uint16_t prefix, uint8_t suffix)
321 {
322 Table *table = *tablep;
323 if (table->nentries == table->bulk) {
324 table->bulk *= 2;
325 table = lv_mem_realloc(table, sizeof(*table) + sizeof(Entry) * table->bulk);
326 if (!table) return -1;
327 table->entries = (Entry *) &table[1];
328 *tablep = table;
329 }
330 table->entries[table->nentries] = (Entry) {length, prefix, suffix};
331 table->nentries++;
332 if ((table->nentries & (table->nentries - 1)) == 0)
333 return 1;
334 return 0;
335 }
336
337 static uint16_t
get_key(gd_GIF * gif,int key_size,uint8_t * sub_len,uint8_t * shift,uint8_t * byte)338 get_key(gd_GIF *gif, int key_size, uint8_t *sub_len, uint8_t *shift, uint8_t *byte)
339 {
340 int bits_read;
341 int rpad;
342 int frag_size;
343 uint16_t key;
344
345 key = 0;
346 for (bits_read = 0; bits_read < key_size; bits_read += frag_size) {
347 rpad = (*shift + bits_read) % 8;
348 if (rpad == 0) {
349 /* Update byte. */
350 if (*sub_len == 0) {
351 f_gif_read(gif, sub_len, 1); /* Must be nonzero! */
352 if (*sub_len == 0) return 0x1000;
353 }
354 f_gif_read(gif, byte, 1);
355 (*sub_len)--;
356 }
357 frag_size = MIN(key_size - bits_read, 8 - rpad);
358 key |= ((uint16_t) ((*byte) >> rpad)) << bits_read;
359 }
360 /* Clear extra bits to the left. */
361 key &= (1 << key_size) - 1;
362 *shift = (*shift + key_size) % 8;
363 return key;
364 }
365
366 /* Compute output index of y-th input line, in frame of height h. */
367 static int
interlaced_line_index(int h,int y)368 interlaced_line_index(int h, int y)
369 {
370 int p; /* number of lines in current pass */
371
372 p = (h - 1) / 8 + 1;
373 if (y < p) /* pass 1 */
374 return y * 8;
375 y -= p;
376 p = (h - 5) / 8 + 1;
377 if (y < p) /* pass 2 */
378 return y * 8 + 4;
379 y -= p;
380 p = (h - 3) / 4 + 1;
381 if (y < p) /* pass 3 */
382 return y * 4 + 2;
383 y -= p;
384 /* pass 4 */
385 return y * 2 + 1;
386 }
387
388 /* Decompress image pixels.
389 * Return 0 on success or -1 on out-of-memory (w.r.t. LZW code table). */
390 static int
read_image_data(gd_GIF * gif,int interlace)391 read_image_data(gd_GIF *gif, int interlace)
392 {
393 uint8_t sub_len, shift, byte;
394 int init_key_size, key_size, table_is_full=0;
395 int frm_off, frm_size, str_len=0, i, p, x, y;
396 uint16_t key, clear, stop;
397 int ret;
398 Table *table;
399 Entry entry = {0};
400 size_t start, end;
401
402 f_gif_read(gif, &byte, 1);
403 key_size = (int) byte;
404 start = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
405 discard_sub_blocks(gif);
406 end = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
407 f_gif_seek(gif, start, LV_FS_SEEK_SET);
408 clear = 1 << key_size;
409 stop = clear + 1;
410 table = new_table(key_size);
411 key_size++;
412 init_key_size = key_size;
413 sub_len = shift = 0;
414 key = get_key(gif, key_size, &sub_len, &shift, &byte); /* clear code */
415 frm_off = 0;
416 ret = 0;
417 frm_size = gif->fw*gif->fh;
418 while (frm_off < frm_size) {
419 if (key == clear) {
420 key_size = init_key_size;
421 table->nentries = (1 << (key_size - 1)) + 2;
422 table_is_full = 0;
423 } else if (!table_is_full) {
424 ret = add_entry(&table, str_len + 1, key, entry.suffix);
425 if (ret == -1) {
426 lv_mem_free(table);
427 return -1;
428 }
429 if (table->nentries == 0x1000) {
430 ret = 0;
431 table_is_full = 1;
432 }
433 }
434 key = get_key(gif, key_size, &sub_len, &shift, &byte);
435 if (key == clear) continue;
436 if (key == stop || key == 0x1000) break;
437 if (ret == 1) key_size++;
438 entry = table->entries[key];
439 str_len = entry.length;
440 for (i = 0; i < str_len; i++) {
441 p = frm_off + entry.length - 1;
442 x = p % gif->fw;
443 y = p / gif->fw;
444 if (interlace)
445 y = interlaced_line_index((int) gif->fh, y);
446 gif->frame[(gif->fy + y) * gif->width + gif->fx + x] = entry.suffix;
447 if (entry.prefix == 0xFFF)
448 break;
449 else
450 entry = table->entries[entry.prefix];
451 }
452 frm_off += str_len;
453 if (key < table->nentries - 1 && !table_is_full)
454 table->entries[table->nentries - 1].suffix = entry.suffix;
455 }
456 lv_mem_free(table);
457 if (key == stop) f_gif_read(gif, &sub_len, 1); /* Must be zero! */
458 f_gif_seek(gif, end, LV_FS_SEEK_SET);
459 return 0;
460 }
461
462 /* Read image.
463 * Return 0 on success or -1 on out-of-memory (w.r.t. LZW code table). */
464 static int
read_image(gd_GIF * gif)465 read_image(gd_GIF *gif)
466 {
467 uint8_t fisrz;
468 int interlace;
469
470 /* Image Descriptor. */
471 gif->fx = read_num(gif);
472 gif->fy = read_num(gif);
473 gif->fw = read_num(gif);
474 gif->fh = read_num(gif);
475 f_gif_read(gif, &fisrz, 1);
476 interlace = fisrz & 0x40;
477 /* Ignore Sort Flag. */
478 /* Local Color Table? */
479 if (fisrz & 0x80) {
480 /* Read LCT */
481 gif->lct.size = 1 << ((fisrz & 0x07) + 1);
482 f_gif_read(gif, gif->lct.colors, 3 * gif->lct.size);
483 gif->palette = &gif->lct;
484 } else
485 gif->palette = &gif->gct;
486 /* Image Data. */
487 return read_image_data(gif, interlace);
488 }
489
490 static void
render_frame_rect(gd_GIF * gif,uint8_t * buffer)491 render_frame_rect(gd_GIF *gif, uint8_t *buffer)
492 {
493 int i, j, k;
494 uint8_t index, *color;
495 i = gif->fy * gif->width + gif->fx;
496 for (j = 0; j < gif->fh; j++) {
497 for (k = 0; k < gif->fw; k++) {
498 index = gif->frame[(gif->fy + j) * gif->width + gif->fx + k];
499 color = &gif->palette->colors[index*3];
500 if (!gif->gce.transparency || index != gif->gce.tindex) {
501 #if LV_COLOR_DEPTH == 32
502 buffer[(i+k)*4 + 0] = *(color + 2);
503 buffer[(i+k)*4 + 1] = *(color + 1);
504 buffer[(i+k)*4 + 2] = *(color + 0);
505 buffer[(i+k)*4 + 3] = 0xFF;
506 #elif LV_COLOR_DEPTH == 16
507 lv_color_t c = lv_color_make(*(color + 0), *(color + 1), *(color + 2));
508 buffer[(i+k)*3 + 0] = c.full & 0xff;
509 buffer[(i+k)*3 + 1] = (c.full >> 8) & 0xff;
510 buffer[(i+k)*3 + 2] = 0xff;
511 #elif LV_COLOR_DEPTH == 8
512 lv_color_t c = lv_color_make(*(color + 0), *(color + 1), *(color + 2));
513 buffer[(i+k)*2 + 0] = c.full;
514 buffer[(i+k)*2 + 1] = 0xff;
515 #elif LV_COLOR_DEPTH == 1
516 uint8_t b = (*(color + 0)) | (*(color + 1)) | (*(color + 2));
517 buffer[(i+k)*2 + 0] = b > 128 ? 1 : 0;
518 buffer[(i+k)*2 + 1] = 0xff;
519 #endif
520 }
521 }
522 i += gif->width;
523 }
524 }
525
526 static void
dispose(gd_GIF * gif)527 dispose(gd_GIF *gif)
528 {
529 int i, j, k;
530 uint8_t *bgcolor;
531 switch (gif->gce.disposal) {
532 case 2: /* Restore to background color. */
533 bgcolor = &gif->palette->colors[gif->bgindex*3];
534
535 uint8_t opa = 0xff;
536 if(gif->gce.transparency) opa = 0x00;
537
538 i = gif->fy * gif->width + gif->fx;
539 for (j = 0; j < gif->fh; j++) {
540 for (k = 0; k < gif->fw; k++) {
541 #if LV_COLOR_DEPTH == 32
542 gif->canvas[(i+k)*4 + 0] = *(bgcolor + 2);
543 gif->canvas[(i+k)*4 + 1] = *(bgcolor + 1);
544 gif->canvas[(i+k)*4 + 2] = *(bgcolor + 0);
545 gif->canvas[(i+k)*4 + 3] = opa;
546 #elif LV_COLOR_DEPTH == 16
547 lv_color_t c = lv_color_make(*(bgcolor + 0), *(bgcolor + 1), *(bgcolor + 2));
548 gif->canvas[(i+k)*3 + 0] = c.full & 0xff;
549 gif->canvas[(i+k)*3 + 1] = (c.full >> 8) & 0xff;
550 gif->canvas[(i+k)*3 + 2] = opa;
551 #elif LV_COLOR_DEPTH == 8
552 lv_color_t c = lv_color_make(*(bgcolor + 0), *(bgcolor + 1), *(bgcolor + 2));
553 gif->canvas[(i+k)*2 + 0] = c.full;
554 gif->canvas[(i+k)*2 + 1] = opa;
555 #elif LV_COLOR_DEPTH == 1
556 uint8_t b = (*(bgcolor + 0)) | (*(bgcolor + 1)) | (*(bgcolor + 2));
557 gif->canvas[(i+k)*2 + 0] = b > 128 ? 1 : 0;
558 gif->canvas[(i+k)*2 + 1] = opa;
559 #endif
560 }
561 i += gif->width;
562 }
563 break;
564 case 3: /* Restore to previous, i.e., don't update canvas.*/
565 break;
566 default:
567 /* Add frame non-transparent pixels to canvas. */
568 render_frame_rect(gif, gif->canvas);
569 }
570 }
571
572 /* Return 1 if got a frame; 0 if got GIF trailer; -1 if error. */
573 int
gd_get_frame(gd_GIF * gif)574 gd_get_frame(gd_GIF *gif)
575 {
576 char sep;
577
578 dispose(gif);
579 f_gif_read(gif, &sep, 1);
580 while (sep != ',') {
581 if (sep == ';') {
582 f_gif_seek(gif, gif->anim_start, LV_FS_SEEK_SET);
583 if(gif->loop_count == 1 || gif->loop_count < 0) {
584 return 0;
585 }
586 else if(gif->loop_count > 1) {
587 gif->loop_count--;
588 }
589 }
590 else if (sep == '!')
591 read_ext(gif);
592 else return -1;
593 f_gif_read(gif, &sep, 1);
594 }
595 if (read_image(gif) == -1)
596 return -1;
597 return 1;
598 }
599
600 void
gd_render_frame(gd_GIF * gif,uint8_t * buffer)601 gd_render_frame(gd_GIF *gif, uint8_t *buffer)
602 {
603 // uint32_t i;
604 // uint32_t j;
605 // for(i = 0, j = 0; i < gif->width * gif->height * 3; i+= 3, j+=4) {
606 // buffer[j + 0] = gif->canvas[i + 2];
607 // buffer[j + 1] = gif->canvas[i + 1];
608 // buffer[j + 2] = gif->canvas[i + 0];
609 // buffer[j + 3] = 0xFF;
610 // }
611 // memcpy(buffer, gif->canvas, gif->width * gif->height * 3);
612 render_frame_rect(gif, buffer);
613 }
614
615 void
gd_rewind(gd_GIF * gif)616 gd_rewind(gd_GIF *gif)
617 {
618 gif->loop_count = -1;
619 f_gif_seek(gif, gif->anim_start, LV_FS_SEEK_SET);
620 }
621
622 void
gd_close_gif(gd_GIF * gif)623 gd_close_gif(gd_GIF *gif)
624 {
625 f_gif_close(gif);
626 lv_mem_free(gif);
627 }
628
f_gif_open(gd_GIF * gif,const void * path,bool is_file)629 static bool f_gif_open(gd_GIF * gif, const void * path, bool is_file)
630 {
631 gif->f_rw_p = 0;
632 gif->data = NULL;
633 gif->is_file = is_file;
634
635 if(is_file) {
636 lv_fs_res_t res = lv_fs_open(&gif->fd, path, LV_FS_MODE_RD);
637 if(res != LV_FS_RES_OK) return false;
638 else return true;
639 } else {
640 gif->data = path;
641 return true;
642 }
643 }
644
f_gif_read(gd_GIF * gif,void * buf,size_t len)645 static void f_gif_read(gd_GIF * gif, void * buf, size_t len)
646 {
647 if(gif->is_file) {
648 lv_fs_read(&gif->fd, buf, len, NULL);
649 } else
650 {
651 memcpy(buf, &gif->data[gif->f_rw_p], len);
652 gif->f_rw_p += len;
653 }
654 }
655
f_gif_seek(gd_GIF * gif,size_t pos,int k)656 static int f_gif_seek(gd_GIF * gif, size_t pos, int k)
657 {
658 if(gif->is_file) {
659 lv_fs_seek(&gif->fd, pos, k);
660 uint32_t x;
661 lv_fs_tell(&gif->fd, &x);
662 return x;
663 } else {
664 if(k == LV_FS_SEEK_CUR) gif->f_rw_p += pos;
665 else if(k == LV_FS_SEEK_SET) gif->f_rw_p = pos;
666 return gif->f_rw_p;
667 }
668 }
669
f_gif_close(gd_GIF * gif)670 static void f_gif_close(gd_GIF * gif)
671 {
672 if(gif->is_file) {
673 lv_fs_close(&gif->fd);
674 }
675 }
676
677 #endif /*LV_USE_GIF*/
678
