#include "gifdec.h"
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <esp_log.h>
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#define TAG "GIF"
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#define MIN(A, B) ((A) < (B) ? (A) : (B))
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#define MAX(A, B) ((A) > (B) ? (A) : (B))
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typedef struct Entry {
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uint16_t length;
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uint16_t prefix;
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uint8_t suffix;
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} Entry;
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typedef struct Table {
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int bulk;
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int nentries;
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Entry * entries;
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} Table;
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#if LV_GIF_CACHE_DECODE_DATA
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#define LZW_MAXBITS 12
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#define LZW_TABLE_SIZE (1 << LZW_MAXBITS)
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#define LZW_CACHE_SIZE (LZW_TABLE_SIZE * 4)
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#endif
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static gd_GIF * gif_open(gd_GIF * gif);
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static bool f_gif_open(gd_GIF * gif, const void * path, bool is_file);
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static inline void f_gif_read(gd_GIF * gif, void * buf, size_t len);
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static inline int f_gif_seek(gd_GIF * gif, size_t pos, int k);
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static void f_gif_close(gd_GIF * gif);
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#if LV_USE_DRAW_SW_ASM == LV_DRAW_SW_ASM_HELIUM
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#include "gifdec_mve.h"
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#endif
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static uint16_t
|
read_num(gd_GIF * gif)
|
{
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uint8_t bytes[2];
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|
f_gif_read(gif, bytes, 2);
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return bytes[0] + (((uint16_t) bytes[1]) << 8);
|
}
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gd_GIF *
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gd_open_gif_file(const char * fname)
|
{
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gd_GIF gif_base;
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memset(&gif_base, 0, sizeof(gif_base));
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bool res = f_gif_open(&gif_base, fname, true);
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if(!res) return NULL;
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return gif_open(&gif_base);
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}
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gd_GIF *
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gd_open_gif_data(const void * data)
|
{
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gd_GIF gif_base;
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memset(&gif_base, 0, sizeof(gif_base));
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bool res = f_gif_open(&gif_base, data, false);
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if(!res) return NULL;
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return gif_open(&gif_base);
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}
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static gd_GIF * gif_open(gd_GIF * gif_base)
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{
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uint8_t sigver[3];
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uint16_t width, height, depth;
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uint8_t fdsz, bgidx, aspect;
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uint8_t * bgcolor;
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int gct_sz;
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gd_GIF * gif = NULL;
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/* Header */
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f_gif_read(gif_base, sigver, 3);
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if(memcmp(sigver, "GIF", 3) != 0) {
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ESP_LOGW(TAG, "invalid signature");
|
goto fail;
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}
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/* Version */
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f_gif_read(gif_base, sigver, 3);
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if(memcmp(sigver, "89a", 3) != 0 && memcmp(sigver, "87a", 3) != 0) {
|
ESP_LOGW(TAG, "invalid version");
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goto fail;
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}
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/* Width x Height */
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width = read_num(gif_base);
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height = read_num(gif_base);
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/* FDSZ */
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f_gif_read(gif_base, &fdsz, 1);
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/* Presence of GCT */
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if(!(fdsz & 0x80)) {
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ESP_LOGW(TAG, "no global color table");
|
goto fail;
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}
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/* Color Space's Depth */
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depth = ((fdsz >> 4) & 7) + 1;
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/* Ignore Sort Flag. */
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/* GCT Size */
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gct_sz = 1 << ((fdsz & 0x07) + 1);
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/* Background Color Index */
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f_gif_read(gif_base, &bgidx, 1);
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/* Aspect Ratio */
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f_gif_read(gif_base, &aspect, 1);
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/* Create gd_GIF Structure. */
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if(0 == width || 0 == height){
|
ESP_LOGW(TAG, "Zero size image");
|
goto fail;
|
}
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#if LV_GIF_CACHE_DECODE_DATA
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if(0 == (INT_MAX - sizeof(gd_GIF) - LZW_CACHE_SIZE) / width / height / 5){
|
ESP_LOGW(TAG, "Image dimensions are too large");
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goto fail;
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}
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gif = lv_malloc(sizeof(gd_GIF) + 5 * width * height + LZW_CACHE_SIZE);
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#else
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if(0 == (INT_MAX - sizeof(gd_GIF)) / width / height / 5){
|
ESP_LOGW(TAG, "Image dimensions are too large");
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goto fail;
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}
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gif = lv_malloc(sizeof(gd_GIF) + 5 * width * height);
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#endif
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if(!gif) goto fail;
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memcpy(gif, gif_base, sizeof(gd_GIF));
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gif->width = width;
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gif->height = height;
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gif->depth = depth;
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/* Read GCT */
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gif->gct.size = gct_sz;
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f_gif_read(gif, gif->gct.colors, 3 * gif->gct.size);
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gif->palette = &gif->gct;
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gif->bgindex = bgidx;
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gif->canvas = (uint8_t *) &gif[1];
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gif->frame = &gif->canvas[4 * width * height];
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if(gif->bgindex) {
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memset(gif->frame, gif->bgindex, gif->width * gif->height);
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}
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bgcolor = &gif->palette->colors[gif->bgindex * 3];
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#if LV_GIF_CACHE_DECODE_DATA
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gif->lzw_cache = gif->frame + width * height;
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#endif
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#ifdef GIFDEC_FILL_BG
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GIFDEC_FILL_BG(gif->canvas, gif->width * gif->height, 1, gif->width * gif->height, bgcolor, 0x00);
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#else
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for(int i = 0; i < gif->width * gif->height; i++) {
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gif->canvas[i * 4 + 0] = *(bgcolor + 2);
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gif->canvas[i * 4 + 1] = *(bgcolor + 1);
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gif->canvas[i * 4 + 2] = *(bgcolor + 0);
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gif->canvas[i * 4 + 3] = 0x00; // 初始化为透明，让第一帧根据自己的透明度设置来渲染
|
}
|
#endif
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gif->anim_start = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
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gif->loop_count = -1;
|
goto ok;
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fail:
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f_gif_close(gif_base);
|
ok:
|
return gif;
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}
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static void
|
discard_sub_blocks(gd_GIF * gif)
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{
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uint8_t size;
|
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do {
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f_gif_read(gif, &size, 1);
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f_gif_seek(gif, size, LV_FS_SEEK_CUR);
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} while(size);
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}
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static void
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read_plain_text_ext(gd_GIF * gif)
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{
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if(gif->plain_text) {
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uint16_t tx, ty, tw, th;
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uint8_t cw, ch, fg, bg;
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size_t sub_block;
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f_gif_seek(gif, 1, LV_FS_SEEK_CUR); /* block size = 12 */
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tx = read_num(gif);
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ty = read_num(gif);
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tw = read_num(gif);
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th = read_num(gif);
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f_gif_read(gif, &cw, 1);
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f_gif_read(gif, &ch, 1);
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f_gif_read(gif, &fg, 1);
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f_gif_read(gif, &bg, 1);
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sub_block = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
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gif->plain_text(gif, tx, ty, tw, th, cw, ch, fg, bg);
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f_gif_seek(gif, sub_block, LV_FS_SEEK_SET);
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}
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else {
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/* Discard plain text metadata. */
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f_gif_seek(gif, 13, LV_FS_SEEK_CUR);
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}
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/* Discard plain text sub-blocks. */
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discard_sub_blocks(gif);
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}
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static void
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read_graphic_control_ext(gd_GIF * gif)
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{
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uint8_t rdit;
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/* Discard block size (always 0x04). */
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f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
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f_gif_read(gif, &rdit, 1);
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gif->gce.disposal = (rdit >> 2) & 3;
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gif->gce.input = rdit & 2;
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gif->gce.transparency = rdit & 1;
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gif->gce.delay = read_num(gif);
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f_gif_read(gif, &gif->gce.tindex, 1);
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/* Skip block terminator. */
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f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
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}
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static void
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read_comment_ext(gd_GIF * gif)
|
{
|
if(gif->comment) {
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size_t sub_block = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
|
gif->comment(gif);
|
f_gif_seek(gif, sub_block, LV_FS_SEEK_SET);
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}
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/* Discard comment sub-blocks. */
|
discard_sub_blocks(gif);
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}
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static void
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read_application_ext(gd_GIF * gif)
|
{
|
char app_id[8];
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char app_auth_code[3];
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uint16_t loop_count;
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/* Discard block size (always 0x0B). */
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f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
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/* Application Identifier. */
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f_gif_read(gif, app_id, 8);
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/* Application Authentication Code. */
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f_gif_read(gif, app_auth_code, 3);
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if(!strncmp(app_id, "NETSCAPE", sizeof(app_id))) {
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/* Discard block size (0x03) and constant byte (0x01). */
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f_gif_seek(gif, 2, LV_FS_SEEK_CUR);
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loop_count = read_num(gif);
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if(gif->loop_count < 0) {
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if(loop_count == 0) {
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gif->loop_count = 0;
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}
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else {
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gif->loop_count = loop_count + 1;
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}
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}
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/* Skip block terminator. */
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f_gif_seek(gif, 1, LV_FS_SEEK_CUR);
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}
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else if(gif->application) {
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size_t sub_block = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
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gif->application(gif, app_id, app_auth_code);
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f_gif_seek(gif, sub_block, LV_FS_SEEK_SET);
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discard_sub_blocks(gif);
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}
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else {
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discard_sub_blocks(gif);
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}
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}
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static void
|
read_ext(gd_GIF * gif)
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{
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uint8_t label;
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|
f_gif_read(gif, &label, 1);
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switch(label) {
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case 0x01:
|
read_plain_text_ext(gif);
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break;
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case 0xF9:
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read_graphic_control_ext(gif);
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break;
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case 0xFE:
|
read_comment_ext(gif);
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break;
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case 0xFF:
|
read_application_ext(gif);
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break;
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default:
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ESP_LOGW(TAG, "unknown extension: %02X\n", label);
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}
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}
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static uint16_t
|
get_key(gd_GIF *gif, int key_size, uint8_t *sub_len, uint8_t *shift, uint8_t *byte)
|
{
|
int bits_read;
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int rpad;
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int frag_size;
|
uint16_t key;
|
|
key = 0;
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for (bits_read = 0; bits_read < key_size; bits_read += frag_size) {
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rpad = (*shift + bits_read) % 8;
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if (rpad == 0) {
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/* Update byte. */
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if (*sub_len == 0) {
|
f_gif_read(gif, sub_len, 1); /* Must be nonzero! */
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if (*sub_len == 0) return 0x1000;
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}
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f_gif_read(gif, byte, 1);
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(*sub_len)--;
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}
|
frag_size = MIN(key_size - bits_read, 8 - rpad);
|
key |= ((uint16_t) ((*byte) >> rpad)) << bits_read;
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}
|
/* Clear extra bits to the left. */
|
key &= (1 << key_size) - 1;
|
*shift = (*shift + key_size) % 8;
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return key;
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}
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#if LV_GIF_CACHE_DECODE_DATA
|
/* Decompress image pixels.
|
* Return 0 on success or -1 on out-of-memory (w.r.t. LZW code table) or parse error. */
|
static int
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read_image_data(gd_GIF *gif, int interlace)
|
{
|
uint8_t sub_len, shift, byte;
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int ret = 0;
|
int key_size;
|
int y, pass, linesize;
|
uint8_t *ptr = NULL;
|
uint8_t *ptr_row_start = NULL;
|
uint8_t *ptr_base = NULL;
|
size_t start, end;
|
uint16_t key, clear_code, stop_code, curr_code;
|
int frm_off, frm_size,curr_size,top_slot,new_codes,slot;
|
/* The first value of the value sequence corresponding to key */
|
int first_value;
|
int last_key;
|
uint8_t *sp = NULL;
|
uint8_t *p_stack = NULL;
|
uint8_t *p_suffix = NULL;
|
uint16_t *p_prefix = NULL;
|
|
/* get initial key size and clear code, stop code */
|
f_gif_read(gif, &byte, 1);
|
key_size = (int) byte;
|
clear_code = 1 << key_size;
|
stop_code = clear_code + 1;
|
key = 0;
|
|
start = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
|
discard_sub_blocks(gif);
|
end = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
|
f_gif_seek(gif, start, LV_FS_SEEK_SET);
|
|
linesize = gif->width;
|
ptr_base = &gif->frame[gif->fy * linesize + gif->fx];
|
ptr_row_start = ptr_base;
|
ptr = ptr_row_start;
|
sub_len = shift = 0;
|
/* decoder */
|
pass = 0;
|
y = 0;
|
p_stack = gif->lzw_cache;
|
p_suffix = gif->lzw_cache + LZW_TABLE_SIZE;
|
p_prefix = (uint16_t*)(gif->lzw_cache + LZW_TABLE_SIZE * 2);
|
frm_off = 0;
|
frm_size = gif->fw * gif->fh;
|
curr_size = key_size + 1;
|
top_slot = 1 << curr_size;
|
new_codes = clear_code + 2;
|
slot = new_codes;
|
first_value = -1;
|
last_key = -1;
|
sp = p_stack;
|
|
while (frm_off < frm_size) {
|
/* copy data to frame buffer */
|
while (sp > p_stack) {
|
if(frm_off >= frm_size){
|
ESP_LOGW(TAG, "LZW table token overflows the frame buffer");
|
return -1;
|
}
|
*ptr++ = *(--sp);
|
frm_off += 1;
|
/* read one line */
|
if ((ptr - ptr_row_start) == gif->fw) {
|
if (interlace) {
|
switch(pass) {
|
case 0:
|
case 1:
|
y += 8;
|
ptr_row_start += linesize * 8;
|
break;
|
case 2:
|
y += 4;
|
ptr_row_start += linesize * 4;
|
break;
|
case 3:
|
y += 2;
|
ptr_row_start += linesize * 2;
|
break;
|
default:
|
break;
|
}
|
while (y >= gif->fh) {
|
y = 4 >> pass;
|
ptr_row_start = ptr_base + linesize * y;
|
pass++;
|
}
|
} else {
|
ptr_row_start += linesize;
|
}
|
ptr = ptr_row_start;
|
}
|
}
|
|
key = get_key(gif, curr_size, &sub_len, &shift, &byte);
|
|
if (key == stop_code || key >= LZW_TABLE_SIZE)
|
break;
|
|
if (key == clear_code) {
|
curr_size = key_size + 1;
|
slot = new_codes;
|
top_slot = 1 << curr_size;
|
first_value = last_key = -1;
|
sp = p_stack;
|
continue;
|
}
|
|
curr_code = key;
|
/*
|
* If the current code is a code that will be added to the decoding
|
* dictionary, it is composed of the data list corresponding to the
|
* previous key and its first data.
|
* */
|
if (curr_code == slot && first_value >= 0) {
|
*sp++ = first_value;
|
curr_code = last_key;
|
}else if(curr_code >= slot)
|
break;
|
|
while (curr_code >= new_codes) {
|
*sp++ = p_suffix[curr_code];
|
curr_code = p_prefix[curr_code];
|
}
|
*sp++ = curr_code;
|
|
/* Add code to decoding dictionary */
|
if (slot < top_slot && last_key >= 0) {
|
p_suffix[slot] = curr_code;
|
p_prefix[slot++] = last_key;
|
}
|
first_value = curr_code;
|
last_key = key;
|
if (slot >= top_slot) {
|
if (curr_size < LZW_MAXBITS) {
|
top_slot <<= 1;
|
curr_size += 1;
|
}
|
}
|
}
|
|
if (key == stop_code) f_gif_read(gif, &sub_len, 1); /* Must be zero! */
|
f_gif_seek(gif, end, LV_FS_SEEK_SET);
|
return ret;
|
}
|
#else
|
static Table *
|
new_table(int key_size)
|
{
|
int key;
|
int init_bulk = MAX(1 << (key_size + 1), 0x100);
|
Table * table = lv_malloc(sizeof(*table) + sizeof(Entry) * init_bulk);
|
if(table) {
|
table->bulk = init_bulk;
|
table->nentries = (1 << key_size) + 2;
|
table->entries = (Entry *) &table[1];
|
for(key = 0; key < (1 << key_size); key++)
|
table->entries[key] = (Entry) {
|
1, 0xFFF, key
|
};
|
}
|
return table;
|
}
|
|
/* Add table entry. Return value:
|
* 0 on success
|
* +1 if key size must be incremented after this addition
|
* -1 if could not realloc table */
|
static int
|
add_entry(Table ** tablep, uint16_t length, uint16_t prefix, uint8_t suffix)
|
{
|
Table * table = *tablep;
|
if(table->nentries == table->bulk) {
|
table->bulk *= 2;
|
table = lv_realloc(table, sizeof(*table) + sizeof(Entry) * table->bulk);
|
if(!table) return -1;
|
table->entries = (Entry *) &table[1];
|
*tablep = table;
|
}
|
table->entries[table->nentries] = (Entry) {
|
length, prefix, suffix
|
};
|
table->nentries++;
|
if((table->nentries & (table->nentries - 1)) == 0)
|
return 1;
|
return 0;
|
}
|
|
/* Compute output index of y-th input line, in frame of height h. */
|
static int
|
interlaced_line_index(int h, int y)
|
{
|
int p; /* number of lines in current pass */
|
|
p = (h - 1) / 8 + 1;
|
if(y < p) /* pass 1 */
|
return y * 8;
|
y -= p;
|
p = (h - 5) / 8 + 1;
|
if(y < p) /* pass 2 */
|
return y * 8 + 4;
|
y -= p;
|
p = (h - 3) / 4 + 1;
|
if(y < p) /* pass 3 */
|
return y * 4 + 2;
|
y -= p;
|
/* pass 4 */
|
return y * 2 + 1;
|
}
|
|
/* Decompress image pixels.
|
* Return 0 on success or -1 on out-of-memory (w.r.t. LZW code table) or parse error. */
|
static int
|
read_image_data(gd_GIF * gif, int interlace)
|
{
|
uint8_t sub_len, shift, byte;
|
int init_key_size, key_size, table_is_full = 0;
|
int frm_off, frm_size, str_len = 0, i, p, x, y;
|
uint16_t key, clear, stop;
|
int ret;
|
Table * table;
|
Entry entry = {0};
|
size_t start, end;
|
|
f_gif_read(gif, &byte, 1);
|
key_size = (int) byte;
|
start = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
|
discard_sub_blocks(gif);
|
end = f_gif_seek(gif, 0, LV_FS_SEEK_CUR);
|
f_gif_seek(gif, start, LV_FS_SEEK_SET);
|
clear = 1 << key_size;
|
stop = clear + 1;
|
table = new_table(key_size);
|
key_size++;
|
init_key_size = key_size;
|
sub_len = shift = 0;
|
key = get_key(gif, key_size, &sub_len, &shift, &byte); /* clear code */
|
frm_off = 0;
|
ret = 0;
|
frm_size = gif->fw * gif->fh;
|
while(frm_off < frm_size) {
|
if(key == clear) {
|
key_size = init_key_size;
|
table->nentries = (1 << (key_size - 1)) + 2;
|
table_is_full = 0;
|
}
|
else if(!table_is_full) {
|
ret = add_entry(&table, str_len + 1, key, entry.suffix);
|
if(ret == -1) {
|
lv_free(table);
|
return -1;
|
}
|
if(table->nentries == 0x1000) {
|
ret = 0;
|
table_is_full = 1;
|
}
|
}
|
key = get_key(gif, key_size, &sub_len, &shift, &byte);
|
if(key == clear) continue;
|
if(key == stop || key == 0x1000) break;
|
if(ret == 1) key_size++;
|
entry = table->entries[key];
|
str_len = entry.length;
|
if(frm_off + str_len > frm_size){
|
ESP_LOGW(TAG, "LZW table token overflows the frame buffer");
|
lv_free(table);
|
return -1;
|
}
|
for(i = 0; i < str_len; i++) {
|
p = frm_off + entry.length - 1;
|
x = p % gif->fw;
|
y = p / gif->fw;
|
if(interlace)
|
y = interlaced_line_index((int) gif->fh, y);
|
gif->frame[(gif->fy + y) * gif->width + gif->fx + x] = entry.suffix;
|
if(entry.prefix == 0xFFF)
|
break;
|
else
|
entry = table->entries[entry.prefix];
|
}
|
frm_off += str_len;
|
if(key < table->nentries - 1 && !table_is_full)
|
table->entries[table->nentries - 1].suffix = entry.suffix;
|
}
|
lv_free(table);
|
if(key == stop) f_gif_read(gif, &sub_len, 1); /* Must be zero! */
|
f_gif_seek(gif, end, LV_FS_SEEK_SET);
|
return 0;
|
}
|
|
#endif
|
|
/* Read image.
|
* Return 0 on success or -1 on out-of-memory (w.r.t. LZW code table) or parse error. */
|
static int
|
read_image(gd_GIF * gif)
|
{
|
uint8_t fisrz;
|
int interlace;
|
|
/* Image Descriptor. */
|
gif->fx = read_num(gif);
|
gif->fy = read_num(gif);
|
gif->fw = read_num(gif);
|
gif->fh = read_num(gif);
|
if(gif->fx + (uint32_t)gif->fw > gif->width || gif->fy + (uint32_t)gif->fh > gif->height){
|
ESP_LOGW(TAG, "Frame coordinates out of image bounds");
|
return -1;
|
}
|
f_gif_read(gif, &fisrz, 1);
|
interlace = fisrz & 0x40;
|
/* Ignore Sort Flag. */
|
/* Local Color Table? */
|
if(fisrz & 0x80) {
|
/* Read LCT */
|
gif->lct.size = 1 << ((fisrz & 0x07) + 1);
|
f_gif_read(gif, gif->lct.colors, 3 * gif->lct.size);
|
gif->palette = &gif->lct;
|
}
|
else
|
gif->palette = &gif->gct;
|
/* Image Data. */
|
return read_image_data(gif, interlace);
|
}
|
|
static void
|
render_frame_rect(gd_GIF * gif, uint8_t * buffer)
|
{
|
int i = gif->fy * gif->width + gif->fx;
|
#ifdef GIFDEC_RENDER_FRAME
|
GIFDEC_RENDER_FRAME(&buffer[i * 4], gif->fw, gif->fh, gif->width,
|
&gif->frame[i], gif->palette->colors,
|
gif->gce.transparency ? gif->gce.tindex : 0x100);
|
#else
|
int j, k;
|
uint8_t index, * color;
|
|
for(j = 0; j < gif->fh; j++) {
|
for(k = 0; k < gif->fw; k++) {
|
index = gif->frame[(gif->fy + j) * gif->width + gif->fx + k];
|
color = &gif->palette->colors[index * 3];
|
if(!gif->gce.transparency || index != gif->gce.tindex) {
|
buffer[(i + k) * 4 + 0] = *(color + 2);
|
buffer[(i + k) * 4 + 1] = *(color + 1);
|
buffer[(i + k) * 4 + 2] = *(color + 0);
|
buffer[(i + k) * 4 + 3] = 0xFF;
|
}
|
}
|
i += gif->width;
|
}
|
#endif
|
}
|
|
static void
|
dispose(gd_GIF * gif)
|
{
|
int i;
|
uint8_t * bgcolor;
|
switch(gif->gce.disposal) {
|
case 2: /* Restore to background color. */
|
bgcolor = &gif->palette->colors[gif->bgindex * 3];
|
|
uint8_t opa = 0xff;
|
if(gif->gce.transparency) opa = 0x00;
|
|
i = gif->fy * gif->width + gif->fx;
|
#ifdef GIFDEC_FILL_BG
|
GIFDEC_FILL_BG(&(gif->canvas[i * 4]), gif->fw, gif->fh, gif->width, bgcolor, opa);
|
#else
|
int j, k;
|
for(j = 0; j < gif->fh; j++) {
|
for(k = 0; k < gif->fw; k++) {
|
gif->canvas[(i + k) * 4 + 0] = *(bgcolor + 2);
|
gif->canvas[(i + k) * 4 + 1] = *(bgcolor + 1);
|
gif->canvas[(i + k) * 4 + 2] = *(bgcolor + 0);
|
gif->canvas[(i + k) * 4 + 3] = opa;
|
}
|
i += gif->width;
|
}
|
#endif
|
break;
|
case 3: /* Restore to previous, i.e., don't update canvas.*/
|
break;
|
default:
|
/* Add frame non-transparent pixels to canvas. */
|
render_frame_rect(gif, gif->canvas);
|
}
|
}
|
|
/* Return 1 if got a frame; 0 if got GIF trailer; -1 if error. */
|
int
|
gd_get_frame(gd_GIF * gif)
|
{
|
char sep;
|
|
dispose(gif);
|
f_gif_read(gif, &sep, 1);
|
while(sep != ',') {
|
if(sep == ';') {
|
f_gif_seek(gif, gif->anim_start, LV_FS_SEEK_SET);
|
if(gif->loop_count == 1 || gif->loop_count < 0) {
|
return 0;
|
}
|
else if(gif->loop_count > 1) {
|
gif->loop_count--;
|
}
|
}
|
else if(sep == '!')
|
read_ext(gif);
|
else return -1;
|
f_gif_read(gif, &sep, 1);
|
}
|
if(read_image(gif) == -1)
|
return -1;
|
return 1;
|
}
|
|
void
|
gd_render_frame(gd_GIF * gif, uint8_t * buffer)
|
{
|
render_frame_rect(gif, buffer);
|
}
|
|
void
|
gd_rewind(gd_GIF * gif)
|
{
|
gif->loop_count = -1;
|
f_gif_seek(gif, gif->anim_start, LV_FS_SEEK_SET);
|
}
|
|
void
|
gd_close_gif(gd_GIF * gif)
|
{
|
f_gif_close(gif);
|
lv_free(gif);
|
}
|
|
static bool f_gif_open(gd_GIF * gif, const void * path, bool is_file)
|
{
|
gif->f_rw_p = 0;
|
gif->data = NULL;
|
gif->is_file = is_file;
|
|
if(is_file) {
|
lv_fs_res_t res = lv_fs_open(&gif->fd, path, LV_FS_MODE_RD);
|
if(res != LV_FS_RES_OK) return false;
|
else return true;
|
}
|
else {
|
gif->data = path;
|
return true;
|
}
|
}
|
|
static void f_gif_read(gd_GIF * gif, void * buf, size_t len)
|
{
|
if(gif->is_file) {
|
lv_fs_read(&gif->fd, buf, len, NULL);
|
}
|
else {
|
memcpy(buf, &gif->data[gif->f_rw_p], len);
|
gif->f_rw_p += len;
|
}
|
}
|
|
static int f_gif_seek(gd_GIF * gif, size_t pos, int k)
|
{
|
if(gif->is_file) {
|
lv_fs_seek(&gif->fd, pos, k);
|
uint32_t x;
|
lv_fs_tell(&gif->fd, &x);
|
return x;
|
}
|
else {
|
if(k == LV_FS_SEEK_CUR) gif->f_rw_p += pos;
|
else if(k == LV_FS_SEEK_SET) gif->f_rw_p = pos;
|
return gif->f_rw_p;
|
}
|
}
|
|
static void f_gif_close(gd_GIF * gif)
|
{
|
if(gif->is_file) {
|
lv_fs_close(&gif->fd);
|
}
|
}
|
