DennisOSRM/Project-OSRM — comment on commit 94bd6e22ffe761b6aed640cc5dd53a94daa8d8a3
File:  line 0
By DennisOSRM:

pngwriter is a typo. I meant to say pngImage, which is distributed along OSRM. It's more or less a single class and you can find it in /ThirdParty.