windraw

https://github.com/main-path/windraw

windraw renders shapes and text into an off-screen bitmap using the graphics stack that already ships with Windows — Direct2D for vector drawing, DirectWrite for text, and WIC for PNG encoding — then saves a PNG to a file or returns the bytes as a string. A Cairo-style 2D canvas with no window or message loop required. Windows MSVC (mswin) Ruby only.