method beginRenderMask

Source

@override
void beginRenderMask(RenderState renderState, RenderMask mask) {
  var matrix = renderState.globalMatrix;
  _renderingContext.setTransform(matrix.a, matrix.b, matrix.c, matrix.d, matrix.tx, matrix.ty);
  _renderingContext.beginPath();
  mask.renderMask(renderState);
  _renderingContext.save();
  _renderingContext.clip();
}