Does anyone know of an example like this that shows a bitmap, without external libraries? As far as I know, you have to ask the server for the active bit depth

Does anyone know of an example like this that shows a bitmap, without external libraries? As far as I know, you have to ask the server for the active bit depth and send bitmap data in a matching way, meaning every client needs to have code to convert to every pixel format under the sun. Maybe that's not true though, I'm not sure.