drawDRRect method

void drawDRRect (RRect outer, RRect inner, Paint paint)

Draws a shape consisting of the difference between two rounded rectangles with the given Paint. Whether this shape is filled or stroked (or both) is controlled by Paint.style.

This shape is almost but not quite entirely unlike an annulus.

Implementation 

void drawDRRect(RRect outer, RRect inner, Paint paint) {
  assert(_rrectIsValid(outer));
  assert(_rrectIsValid(inner));
  assert(paint != null);
  _drawDRRect(outer._value, inner._value, paint._objects, paint._data);
}