Today we will see how to convert a complicated algorithm from BASIC to C, then to 6502 assembler, and the optimization process involved.

It all started when Goyo asked in September 2021 if anyone had a fast floodfill routine to share.

I was writing an article about how to create an efficient Flood Fill routine on the Oric, but then I realized that many of the optimizations were generic and could be part of a dedicated article about how to write efficient rasterization code.