startDecode method
Start decoding the data as an animation sequence, but don't actually process the frames until they are requested with decodeFrame.
Implementation
@override
DecodeInfo? startDecode(List<int> bytes) {
info = TgaInfo();
input = InputBuffer(bytes, bigEndian: true);
final header = input.readBytes(18);
if (header[2] != 2) {
return null;
}
if (header[16] != 24 && header[16] != 32) {
return null;
}
info!.width = (header[12] & 0xff) | ((header[13] & 0xff) << 8);
info!.height = (header[14] & 0xff) | ((header[15] & 0xff) << 8);
info!.imageOffset = input.offset;
info!.bpp = header[16];
return info;
}