Creates a render object that applies a mask generated by a Shader to its child.
The shaderCallback and transferMode arguments must not be null.
Source
RenderShaderMask({
ShaderCallback shaderCallback,
TransferMode transferMode: TransferMode.modulate,
RenderBox child
}) : _shaderCallback = shaderCallback, _transferMode = transferMode, super(child) {
assert(shaderCallback != null);
assert(transferMode != null);
}