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  • xlib dev[1]

    root window: 

      At the top of each hierarchy is a root window,which covers each of the display screen.Each root window is partially or completely covered by child windows.All windows except for root window,have parents.

    window note:

       1 Each window or pixmap has its own coordinate.

      2 X does not guarantee to preserve the contents of windows.Programs must be prepared to regenerate the contents of windows on demand.

      3 X also provide off-screen storage of graphic objects,called pixmaps.Single plane (depth 1) pixmaps are sometimes reffered to as bitmaps. Windows and pixmaps together are reffered to as drawable.

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  • 原文地址:https://www.cnblogs.com/billin/p/2442722.html
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