TxImageSpriteBlock constructor

Implementation

TxImageSpriteBlock({
  required TxSprite image,
  required int spriteLineHeight,
  bool progressiveRender = true,
  bool updatable = true
  }) : _image = image,
       _spriteLineHeight = spriteLineHeight,
       _progressiveRender = progressiveRender,
       _updatable = updatable {
  // process the full-sized sprite lines
  for (int i = 0; i < image.height ~/ spriteLineHeight; i++) {
    _spriteLines.add(
      TxSprite(
        width: image.width,
        height: spriteLineHeight,
        numColors: image.numColors,
        paletteData: image.paletteData,
        pixelData: image.pixelData.buffer.asUint8List(i * spriteLineHeight * image.width, spriteLineHeight * image.width)));
  }

  // if there is some final, shorter sprite line, process it too
  int finalHeight  = image.height % spriteLineHeight;
  if (finalHeight > 0) {
    _spriteLines.add(
      TxSprite(
        width: image.width,
        height: finalHeight,
        numColors: image.numColors,
        paletteData: image.paletteData,
        pixelData: image.pixelData.buffer.asUint8List(_spriteLines.length * spriteLineHeight * image.width, finalHeight * image.width)));
  }
}