x11/bitmap 1.1.2 NetBSD

The bitmap program is a rudimentary tool for creating or editing rectangular images made up of 1's and 0's. Bitmaps are used in X for defining clipping regions, cursor shapes, icon shapes, and tile and stipple patterns.

The bmtoa and atobm filters convert bitmap files to and from ASCII strings. They are most commonly used to quickly print out bitmaps and to generate versions for including in text.

This is from the modular X.org X11 project.