call method
Magic method that allows instances of ColorFilter to be called as functions. The filter itself should be called as a function, rather than calling this method directly.
Implementation
Color call(Color color, List args) {
Type startingColorSpace = color.runtimeType;
color = color._convert(this.baseType);
color = this.filterFunction(color, args);
color = color._convert(startingColorSpace);
return color;
}