| Examples of other operating systems allegedly not designed by professionals: https://en.wikipedia.org/wiki/Desktop_Window_Manager The Desktop Window Manager is a compositing window manager, meaning that each program has a buffer that it writes data to; DWM then composites each program's buffer into a final image. https://web.archive.org/web/20040925095929/http://developer.... The Quartz Compositor layer of Mac OS X comprises the window server and the (private) system programming interfaces (SPI) implemented by the window server. In this layer are the facilities responsible for rudimentary screen displays, window compositing and management, event routing, and cursor management. The window server is a single system-wide process that coordinates low-level windowing behavior and enforces a fundamental uniformity in what appears on the screen. It is a lightweight server in that it does not do any rendering itself, but instead communicates with the client graphics libraries layered on top of it. It is “agnostic” in terms of a drawing model. The window server has few dependencies on other system services and libraries. It relies on the kernel environment’s I/O Kit (specifically, device drivers built with the I/O Kit) in order to communicate with the frame buffer, the input infrastructure, and input and output devices. |
Window management on MacOS is done by Dock which talks to Quartz Compositor where the underlying windows live.