addToScene method

  1. @override
EngineLayer addToScene (SceneBuilder builder, [ Offset layerOffset = Offset.zero ])
override

Override this method to upload this layer to the engine.

Return the engine layer for retained rendering. When there's no corresponding engine layer, null is returned.

Implementation 

@override
ui.EngineLayer addToScene(ui.SceneBuilder builder, [Offset layerOffset = Offset.zero]) {
  assert(optionsMask != null);
  builder.addPerformanceOverlay(optionsMask, overlayRect.shift(layerOffset));
  builder.setRasterizerTracingThreshold(rasterizerThreshold);
  builder.setCheckerboardRasterCacheImages(checkerboardRasterCacheImages);
  builder.setCheckerboardOffscreenLayers(checkerboardOffscreenLayers);
  return null; // this does not return an engine layer yet.
}