backing.html

来自「linux图形界面x liberary手册」· HTML 代码 · 共 32 行

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<HTML><HEAD><TITLE>Xlib Programming Manual: Window Attributes: Backing Planes and Backing Pixel Attributes</TITLE></HEAD><BODY><H1 ALIGN=center>3.2.6 Backing Planes and Backing Pixel Attributes</H1>You can set backing planes to indicate (with bits set to 1) which bit planes of an<B><A HREF="../create.html">InputOutput</A></B>window hold dynamic data that must be preserved in backing store and during save unders.The default value for the backing-planes attribute is all bits set to 1.You can set backing pixel to specify what bits to use in planes not covered by backing planes.The default value for the backing-pixel attribute is all bits set to 0.The X server is free to save only the specified bit planes in the backing storeor the save under and is free to regenerate the remaining planes with the specified pixel value.Any extraneous bits in these values (that is, those bits beyond the specified depth of the window) may be simply ignored.If you request backing store or save unders,you should use these members to minimize the amount of off-screen memory required to store your window.<H5 ALIGN=right><I>Next: <A HREF="event-and-do-not-propagate.html">Event Mask and Do Not Propagate Mask Attributes</A></I></H5><HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>

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