push method
Implementation
void push(Matrix matrix, num alpha, [BlendMode? blendMode]) {
final cs1 = _currentContextState!;
final cs2 = _currentContextState!.nextContextState;
cs2.matrix.copyFromAndConcat(matrix, cs1.matrix);
cs2.blendMode = blendMode ?? cs1.blendMode;
cs2.alpha = alpha * cs1.alpha;
_currentContextState = cs2;
}