RenderShaderMask constructor

RenderShaderMask({RenderBox child, @required ShaderCallback shaderCallback, BlendMode blendMode: BlendMode.modulate })

Creates a render object that applies a mask generated by a Shader to its child.

The shaderCallback and blendMode arguments must not be null.

Implementation 

RenderShaderMask({
  RenderBox child,
  @required ShaderCallback shaderCallback,
  BlendMode blendMode = BlendMode.modulate,
}) : assert(shaderCallback != null),
     assert(blendMode != null),
     _shaderCallback = shaderCallback,
     _blendMode = blendMode,
     super(child);