what's the proper implementation of the Chroma

Question

I've been trying to got into Direct2D, and although successful up to this point, i'm stumped on how to implement the Chroma-key Effect on bitmaps. I'm trying to follow: https://msdn.microsoft.com/en-us/library/windows/desktop/dn890715(v=vs.85).aspx , but the code being 4-8 years out of date on average, means i can't find the same methods and functions in the intellisense documentation while typing the code. Has anyone done this before, and had success in making a graphical program? and could you please help me out?