This document discusses different techniques for line clipping and polygon clipping. It describes 4 cases for line clipping depending on whether the line endpoints are inside or outside the clipping area. For polygon clipping, it explains the Sutherland-Hodgeman algorithm which clips polygons against rectangular windows by considering polygon edges as line segments and connecting unconnected edges along the window sides. The document also introduces the midpoint subdivision algorithm for line clipping which uses binary search to iteratively subdivide lines at their midpoints until intersections with the clipping boundary are found.