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backing store
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When a server maintains the contents of a window, the off-screen saved
pixels are known as a backing store.
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before action
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An action of a contact-display that is called when an event is
dispatched to a contact, but before any other contact input processing
is performed.
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bit gravity
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When a window is resized, the contents of the window are not
necessarily discarded. It is possible to request the server to
relocate the previous contents to some region of the window. This
attraction of window contents for some location of a window is known
as bit gravity.
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bitmap
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A pixmap of depth one.
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button grabbing
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Buttons on the pointer can be passively grabbed by a client.
When the button is pressed, the pointer is then actively grabbed by
the client.
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byte order
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For image (pixmap/bitmap) data, byte order is defined by the server,
and clients with different native byte ordering must swap bytes as
necessary. For all other parts of the protocol, the byte order is
defined by the client, and the server swaps bytes as necessary.