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来自「linux图形界面x liberary手册」· HTML 代码 · 共 50 行
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<HTML><HEAD><TITLE>Xlib Programming Manual: Graphics Context Functions</TITLE></HEAD><BODY><H1 ALIGN=center>Chapter 7: Graphics Context Functions</H1>A number of resources are used when performing graphics operations in X.Most information about performing graphics (for example, foregroundcolor, background color, line style, and so on) is stored inresources called graphics contexts (GC).<!.IN "Graphics context">Most graphics operations (see "<A HREF="../graphics/">Graphics Functions</A>") take a GC as an argument.Although in theory the X protocol permits sharing of GCs between applications, it is expected that applications will use their ownGCs when performing operations. Sharing of GCs is highly discouraged because the library may cache GC state.<P>Graphics operations can be performed to either windows or pixmaps, which collectively are called drawables.<!.IN "Root">Each drawable exists on a single screen.A GC is created for a specific screen and drawable depthand can only be used with drawables of matchingscreen and depth.<P>This chapter discusses how to:<UL><P><LI><A HREF="manipulating.html">Manipulate graphics context/state</A><P><LI><A HREF="convenience-functions/">Use GC convenience functions</A></UL><H5 ALIGN=right><I>Next: <A HREF="manipulating.html">Manipulating Graphics Context/State</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>⌨️ 快捷键说明
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