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<HTML><HEAD><TITLE>Xlib Programming Manual: Allocating and Freeing Color Cells</TITLE></HEAD><BODY><H1 ALIGN=center>6.6 Allocating and Freeing Color Cells</H1>There are two ways of allocating color cells: explicitly as read-only entries, one pixel value at a time,or read/write,where you can allocate a number of color cells and planes simultaneously.<!.IN "Read-only colormap cells">A read-only cell has its RGB value set by the server.<!.IN "Read/write colormap cells">Read/write cells do not have defined colors initially;functions described in the next section must be used to store values into them.Although it is possible for any client to store values into a read/writecell allocated by another client,read/write cells normally should be considered private to the clientthat allocated them.<P>Read-only colormap cells are shared among clients.The server counts each allocation and free of the cell by clients.When the last client frees a shared cell, the cell is finally deallocated.If a single client allocates the same read-only cell multipletimes, the server counts each such allocation, not just the first one.<P>To allocate a read-only color cell with an RGB value, use<B><A HREF="XAllocColor.html">XAllocColor()</A></B>.<P>To allocate a read-only color cell with a color in arbitrary format, use<B><A HREF="XcmsAllocColor.html">XcmsAllocColor()</A></B>.<P>To allocate a read-only color cell using a color name and return the closestcolor supported by the hardware in RGB format, use<B><A HREF="XAllocNamedColor.html">XAllocNamedColor()</A></B>.<P>To allocate a read-only color cell using a color name and return the closestcolor supported by the hardware in an arbitrary format, use<B><A HREF="XcmsAllocNamedColor.html">XcmsAllocNamedColor()</A></B>.<P>To allocate read/write color cell and color plane combinations for a<B><A HREF="../window/visual-types.html">PseudoColor</A></B>model, use<B><A HREF="XAllocColorCells.html">XAllocColorCells()</A></B>.<P>To allocate read/write color resources for a<B><A HREF="../window/visual-types.html">DirectColor</A></B>model, use<B><A HREF="XAllocColorPlanes.html">XAllocColorPlanes()</A></B>.<P><!.IN "Freeing" "colors">To free colormap cells, use<B><A HREF="XFreeColors.html">XFreeColors()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="modifying-and-querying-cells.html">Modifying and Querying Colormap Cells</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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