28 #define LZW_TABLE_SIZE              (1 << LZW_MAXBITS)
48     return bytes[0] + (((uint16_t) bytes[1]) << 8);  in read_num()
100     f_gif_read(gif_base, &fdsz, 1);  in gif_open()
107     depth = ((fdsz >> 4) & 7) + 1;  in gif_open()
110     gct_sz = 1 << ((fdsz & 0x07) + 1);  in gif_open()
112     f_gif_read(gif_base, &bgidx, 1);  in gif_open()
114     f_gif_read(gif_base, &aspect, 1);  in gif_open()
143     gif->canvas = (uint8_t *) &gif[1];  in gif_open()
154 … GIFDEC_FILL_BG(gif->canvas, gif->width * gif->height, 1, gif->width * gif->height, bgcolor, 0xff);  in gif_open()
158         gif->canvas[i * 4 + 1] = *(bgcolor + 1);  in gif_open()
164     gif->loop_count = -1;  in gif_open()
178         f_gif_read(gif, &size, 1);  in discard_sub_blocks()
190         f_gif_seek(gif, 1, LV_FS_SEEK_CUR); /* block size = 12 */  in read_plain_text_ext()
195         f_gif_read(gif, &cw, 1);  in read_plain_text_ext()
196         f_gif_read(gif, &ch, 1);  in read_plain_text_ext()
197         f_gif_read(gif, &fg, 1);  in read_plain_text_ext()
198         f_gif_read(gif, &bg, 1);  in read_plain_text_ext()
217     f_gif_seek(gif, 1, LV_FS_SEEK_CUR);  in read_graphic_control_ext()
218     f_gif_read(gif, &rdit, 1);  in read_graphic_control_ext()
221     gif->gce.transparency = rdit & 1;  in read_graphic_control_ext()
223     f_gif_read(gif, &gif->gce.tindex, 1);  in read_graphic_control_ext()
225     f_gif_seek(gif, 1, LV_FS_SEEK_CUR);  in read_graphic_control_ext()
248     f_gif_seek(gif, 1, LV_FS_SEEK_CUR);  in read_application_ext()
262                 gif->loop_count = loop_count + 1;  in read_application_ext()
266         f_gif_seek(gif, 1, LV_FS_SEEK_CUR);  in read_application_ext()
284     f_gif_read(gif, &label, 1);  in read_ext()
317                 f_gif_read(gif, sub_len, 1); /* Must be nonzero! */  in get_key()
320             f_gif_read(gif, byte, 1);  in get_key()
327     key &= (1 << key_size) - 1;  in get_key()
334  * Return 0 on success or -1 on out-of-memory (w.r.t. LZW code table) or parse error. */
357     f_gif_read(gif, &byte, 1);  in read_image_data()
359     clear_code = 1 << key_size;  in read_image_data()
360     stop_code = clear_code + 1;  in read_image_data()
381     curr_size = key_size + 1;  in read_image_data()
382     top_slot = 1 << curr_size;  in read_image_data()
385     first_value = -1;  in read_image_data()
386     last_key = -1;  in read_image_data()
394                 return -1;  in read_image_data()
397             frm_off += 1;  in read_image_data()
403                     case 1:  in read_image_data()
436             curr_size = key_size + 1;  in read_image_data()
438             top_slot = 1 << curr_size;  in read_image_data()
439             first_value = last_key = -1;  in read_image_data()
471                 top_slot <<= 1;  in read_image_data()
472                 curr_size += 1;  in read_image_data()
477     if (key == stop_code) f_gif_read(gif, &sub_len, 1); /* Must be zero! */  in read_image_data()
486     int init_bulk = MAX(1 << (key_size + 1), 0x100);  in new_table()
490         table->nentries = (1 << key_size) + 2;  in new_table()
491         table->entries = (Entry *) &table[1];  in new_table()
492         for(key = 0; key < (1 << key_size); key++)  in new_table()
494             1, 0xFFF, key  in new_table()
502  *  +1 if key size must be incremented after this addition
503  *  -1 if could not realloc table */
511         if(!table) return -1;  in add_entry()
512         table->entries = (Entry *) &table[1];  in add_entry()
519     if((table->nentries & (table->nentries - 1)) == 0)  in add_entry()
520         return 1;  in add_entry()
530     p = (h - 1) / 8 + 1;  in interlaced_line_index()
531     if(y < p)  /* pass 1 */  in interlaced_line_index()
534     p = (h - 5) / 8 + 1;  in interlaced_line_index()
538     p = (h - 3) / 4 + 1;  in interlaced_line_index()
543     return y * 2 + 1;  in interlaced_line_index()
547  * Return 0 on success or -1 on out-of-memory (w.r.t. LZW code table) or parse error. */
560     f_gif_read(gif, &byte, 1);  in read_image_data()
566     clear = 1 << key_size;  in read_image_data()
567     stop = clear + 1;  in read_image_data()
579             table->nentries = (1 << (key_size - 1)) + 2;  in read_image_data()
583             ret = add_entry(&table, str_len + 1, key, entry.suffix);  in read_image_data()
584             if(ret == -1) {  in read_image_data()
586                 return -1;  in read_image_data()
590                 table_is_full = 1;  in read_image_data()
596         if(ret == 1) key_size++;  in read_image_data()
601 		return -1;  in read_image_data()
604             p = frm_off + entry.length - 1;  in read_image_data()
616         if(key < table->nentries - 1 && !table_is_full)  in read_image_data()
617             table->entries[table->nentries - 1].suffix = entry.suffix;  in read_image_data()
620     if(key == stop) f_gif_read(gif, &sub_len, 1);  /* Must be zero! */  in read_image_data()
628  * Return 0 on success or -1 on out-of-memory (w.r.t. LZW code table) or parse error. */
642         return -1;  in read_image()
644     f_gif_read(gif, &fisrz, 1);  in read_image()
650         gif->lct.size = 1 << ((fisrz & 0x07) + 1);  in read_image()
678                 buffer[(i + k) * 4 + 1] = *(color + 1);  in render_frame_rect()
708                     gif->canvas[(i + k) * 4 + 1] = *(bgcolor + 1);  in dispose()
724 /* Return 1 if got a frame; 0 if got GIF trailer; -1 if error. */
731     f_gif_read(gif, &sep, 1);  in gd_get_frame()
735             if(gif->loop_count == 1 || gif->loop_count < 0) {  in gd_get_frame()
738             else if(gif->loop_count > 1) {  in gd_get_frame()
744         else return -1;  in gd_get_frame()
745         f_gif_read(gif, &sep, 1);  in gd_get_frame()
747     if(read_image(gif) == -1)  in gd_get_frame()
748         return -1;  in gd_get_frame()
749     return 1;  in gd_get_frame()
761     gif->loop_count = -1;  in gd_rewind()