1. A method comprising: recognizing an input by one or more modules executable on one or more processors of a computing device as an ink stroke to be rendered by a display device of the computing device; building the ink stroke by the one or more modules using a strip of triangles; identifying, with a geometry module, a bend in the ink stroke that exceeds a threshold change of direction in the ink stroke; replacing, with the geometry module and in response to the identifying, the bend in the ink stroke with a stamp having a geometry of the bend; and sending the strip of triangles and the stamp to a graphics processing unit to render the ink stroke.