DouyinGifDownload - 抖音gif表情包下载到相册（heif格式转gif）

%hook AWEEmojiView

- (void)longPressGesture:(UILongPressGestureRecognizer *)gesture {
    if (gesture.state == UIGestureRecognizerStateBegan) {
        // 获取表情包 URL
        NSString *emojiURL = self.model.url;
        // 下载并转换
        [self downloadAndConvertToGIF:emojiURL];
    }
}

%new
- (void)downloadAndConvertToGIF:(NSString *)url {
    // 下载 HEIF 文件
    NSData *heifData = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];

    // 转换为 GIF
    NSData *gifData = [self convertHEIFToGIF:heifData];

    // 保存到相册
    [self saveGIFToAlbum:gifData];
}

%new
- (NSData *)convertHEIFToGIF:(NSData *)heifData {
    // 使用 ImageIO 框架转换
    CGImageSourceRef source = CGImageSourceCreateWithData(
        (__bridge CFDataRef)heifData, NULL
    );

    NSMutableData *gifData = [NSMutableData data];
    CGImageDestinationRef destination = CGImageDestinationCreateWithData(
        (__bridge CFMutableDataRef)gifData,
        kUTTypeGIF,
        CGImageSourceGetCount(source),
        NULL
    );

    // 设置 GIF 属性（循环播放）
    NSDictionary *gifProperties = @{
        (__bridge NSString *)kCGImagePropertyGIFDictionary: @{
            (__bridge NSString *)kCGImagePropertyGIFLoopCount: @0
        }
    };
    CGImageDestinationSetProperties(
        destination,
        (__bridge CFDictionaryRef)gifProperties
    );

    // 复制所有帧
    NSUInteger frameCount = CGImageSourceGetCount(source);
    for (NSUInteger i = 0; i < frameCount; i++) {
        CGImageDestinationAddImageFromSource(destination, source, i, NULL);
    }

    CGImageDestinationFinalize(destination);
    CFRelease(destination);
    CFRelease(source);

    return gifData;
}

%end