method push

Source

void push(Matrix matrix, num alpha, BlendMode blendMode) {
  var cs1 = _currentContextState;
  var cs2 = _currentContextState.nextContextState;
  cs2.matrix.copyFromAndConcat(matrix, cs1.matrix);
  cs2.blendMode = (blendMode is BlendMode) ? blendMode : cs1.blendMode;
  cs2.alpha = alpha * cs1.alpha;
  _currentContextState = cs2;
}