prepare method

void prepare()

Implementation

void prepare() {
  for (var componentId in components.keys) {
    final component = components[componentId]!;
    maxHSamples = max(maxHSamples, component.hSamples);
    maxVSamples = max(maxVSamples, component.vSamples);
  }

  mcusPerLine = (samplesPerLine! / 8 / maxHSamples).ceil();
  mcusPerColumn = (scanLines! / 8 / maxVSamples).ceil();

  for (var componentId in components.keys) {
    final component = components[componentId]!;
    final blocksPerLine =
        ((samplesPerLine! / 8).ceil() * component.hSamples / maxHSamples)
            .ceil();
    final blocksPerColumn =
        ((scanLines! / 8).ceil() * component.vSamples / maxVSamples).ceil();
    final blocksPerLineForMcu = mcusPerLine * component.hSamples;
    final blocksPerColumnForMcu = mcusPerColumn * component.vSamples;

    final blocks = List.generate(
        blocksPerColumnForMcu,
        (_) => List<Int32List>.generate(
            blocksPerLineForMcu, (_) => Int32List(64),
            growable: false),
        growable: false);

    component.blocksPerLine = blocksPerLine;
    component.blocksPerColumn = blocksPerColumn;
    component.blocks = blocks;
  }
}