Composite (graphics)

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The Composite Extension of the X Window System renders the graphical output of clients " an off-screen buffer. Applications can then take the contents of that buffer and do whatever they like. The off-screen buffer can be automatically merged into the parent window or merged by external programs, called compositing managers."[1]

This enabled the creation of compositing window managers for X, capable of effects like transparency, 3D rotation, and jiggly windows.

The composite extension was added to in version X11R6.8[2] in September 2004.[3]