I am interested in developing paint brushes and other editing tools for a specialized Cocoa image editing program. But I haven’t been able to locate any resources which would allow me to learn this area of programming. I’d be greatful for any pointers to where I could learn these subjects.
Thank you for your help.
Do you mean 2D bitmap brush imaging? If so, there should be enough in the OpenGL Programming book (hard copy or online here) to get started with the pixel transfer stuff you’ll need. Try looking at chapter 8 - Drawing Pixels, Bitmaps, Fonts, and Images
hope that helped. 
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