data property

@override FutureOr<Uint8List> get data

Implementation

@override
FutureOr<Uint8List> get data async {
  final (:byteColors, :width, :height) = await _imageInfo;

  final List<int> pixels = [];

  for (var h = 0; h < height; h++) {
    for (var w = 0; w < width; w += 8) {
      int value = 0;
      for (var i = 0; i < 8; i++) {
        final index = (h * width + w + i) * 4;

        if (w + i < width) {
          final red = byteColors[index];
          final green = byteColors[index + 1];
          final blue = byteColors[index + 2];
          final alpha = byteColors[index + 3];

          int pixel = red == 255 && green == 255 && blue == 255 || alpha == 0 ? 0 : 1;
          value |= pixel << 7 - i;
        }
      }
      pixels.add(value);
    }
  }

  final xL = (width + 7) ~/ 8 & 255;
  final xH = (width + 7) ~/ 8 >> 8 & 255;

  final yL = height & 255;
  final yH = height >> 8 & 255;

  return Uint8List.fromList([29, 118, 48, 0, xL, xH, yL, yH] + pixels);
}