read static method

Implementation

static IcoInfo? read(InputBuffer input) {
  if (input.readUint16() != 0) {
    return null;
  }
  final t = input.readUint16();
  if (t >= IcoType.values.length) {
    return null;
  }
  final type = IcoType.values[t];

  if (type == IcoType.cur) {
    // CUR format not yet supported.
    return null;
  }

  final imageCount = input.readUint16();

  final images = List<IcoInfoImage>.generate(
      imageCount,
      (e) => IcoInfoImage(
            width: input.readByte(),
            height: input.readByte(),
            colorPalette: input.readByte(),
            // ignore 1 byte
            colorPlanes: (input..skip(1)).readUint16(),
            bitsPerPixel: input.readUint16(),
            bytesSize: input.readUint32(),
            bytesOffset: input.readUint32(),
          ));

  return IcoInfo(type: type, numFrames: imageCount, images: images);
}