📄 xfreecolors.html
字号:
<HTML><HEAD><TITLE>Xlib Programming Manual: XFreeColors</TITLE></HEAD><BODY><H1 ALIGN=center>XFreeColors</H1><H2>Syntax</H2><!.IN "XFreeColors" "" "@DEF@"><!.IN "Color" "deallocation"><CODE><PRE>XFreeColors(<B>display</B>, <B>colormap</B>, <B>pixels</B>, <B>npixels</B>, <B>planes</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; <A HREF="./#colormap">Colormap</A> <B>colormap</B>; unsigned long <B>pixels</B>[]; int <B>npixels</B>; unsigned long <B>planes</B>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>display</B><TD> Specifies the connection to the X server.<TR><TD> <B>colormap</B><TD> Specifies the colormap.<TR><TD> <B>pixels</B><TD> Specifies an array of pixel values that map to the cells in the specified colormap. <TR><TD> <B>npixels</B><TD> Specifies the number of pixels. <TR><TD> <B>planes</B><TD> Specifies the planes you want to free.</TABLE><H2>Description</H2>The<B>XFreeColors()</B>function frees the cells represented by pixels whose values are in thepixels array.The planes argument should not have any bits set to 1 in common with any of thepixels. The set of all pixels is produced by ORing together subsets ofthe planes argument with the pixels.The request frees all of these pixels thatwere allocated by the client (using <!.IN XAllocColor><!.IN XAllocNamedColor><!.IN XAllocColorCells><!.IN XAllocColorPlanes><B><A HREF="XAllocColor.html">XAllocColor()</A></B>, <B><A HREF="XAllocNamedColor.html">XAllocNamedColor()</A></B>,<B><A HREF="XAllocColorCells.html">XAllocColorCells()</A></B>,and <B><A HREF="XAllocColorPlanes.html">XAllocColorPlanes()</A></B>).Note that freeing anindividual pixel obtained from <B><A HREF="XAllocColorPlanes.html">XAllocColorPlanes()</A></B>may not actually allowit to be reused until all of its related pixels are also freed.Similarly,a read-only entry is not actually freed until it has been freed by all clients,and if a client allocates the same read-only entry multiple times,it must free the entry that many times before the entry is actually freed.<P>All specified pixels that are allocated by the client in the colormap arefreed, even if one or more pixels produce an error. If a specified pixel is not a valid index into the colormap, a <B>BadValue</B>error results.If a specified pixel is not allocated by theclient (that is, is unallocated or is only allocated by another client)or if the colormap was created with all entries writable (by passing<B>AllocAll</B>to<B><A HREF="XCreateColormap.html">XCreateColormap()</A></B>),a<B>BadAccess</B>error results. If more than one pixel is in error, the one that gets reported is arbitrary.<P><B>XFreeColors()</B>can generate<B>BadAccess</B> ,<B>BadColor</B> ,and<B>BadValue</B> errors.<H2>Diagnostics</H2><TABLE><TR><TD><B>BadAccess</B><TD> A client attempted to free a color map entry thatit did not already allocate.<TR><TD><B>BadAccess</B><TD> A client attempted to store into a read-only color map entry.<TR><TD><B>BadColor</B><TD> A value for a Colormap argument does not name a defined Colormap.<TR><TD><B>BadValue</B><TD> Some numeric value falls outside the range of values accepted by the request. Unless a specific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error.</TABLE><H2>See also</H2><B><A HREF="XAllocColor.html">XAllocColor()</A></B>,<B><A HREF="XAllocColorCells.html">XAllocColorCells()</A></B>,<B><A HREF="XAllocColorPlanes.html">XAllocColorPlanes()</A></B>,<B><A HREF="XAllocNamedColor.html">XAllocNamedColor()</A></B>,<B><A HREF="XCreateColormap.html">XCreateColormap()</A></B>,<B><A HREF="XQueryColor.html">XQueryColor()</A></B>,<B><A HREF="XStoreColors.html">XStoreColors()</A></B>,"<A HREF="cell.html">Allocating and Freeing Color Cells</A>".<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
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -