DecodePolygon loads a polygon saved using EncodePolygon function.

DrawPolyline is a simple function for drawing a series of rasterized lines, connecting the points specified in pts (treated as a closed polygon).

EncodeContour serializes all points of a specified contour using a simple textual format.

EncodePolygon serializes all contours of a polygon using a simple textual format.

Putpixel describes a function expected to draw a point on a bitmap at (x, y) coordinates.