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<HTML><HEAD><TITLE>Xlib Programming Manual: Manipulating Bitmaps</TITLE></HEAD><BODY><H1 ALIGN=center>16.9 Manipulating Bitmaps</H1>Xlib provides functions that you can use to read a bitmap from a file,save a bitmap to a file, or create a bitmap. This section describes those functions that transfer bitmaps to andfrom the client's file system, thus allowing their reuse in a laterconnection (for example, from an entirely different client or to adifferent display or server).<P>The X version 11 bitmap file format is:<P><PRE><CODE>#define <B>name</B>_width <B>width</B>#define <B>name</B>_height <B>height</B>#define <B>name</B>_x_hot <B>x</B>#define <B>name</B>_y_hot <B>y</B>static unsigned char <B>name</B>_bits[] = { 0x<B>NN</B>,... }</PRE></CODE><P>The lines for the variables ending with _x_hot and _y_hot suffixes are optionalbecause they are present only if a hotspot has been defined for this bitmap.The lines for the other variables are required.The word ``unsigned'' is optional;that is, the type of the _bits array can be ``char'' or ``unsigned char''.The _bits array must be large enough to contain the size bitmap.The bitmap unit is eight.<P>To read a bitmap from a file and store it in a pixmap, use<B><A HREF="XReadBitmapFile.html">XReadBitmapFile()</A></B>.<P>To read a bitmap from a file and return it as data, use<B><A HREF="XReadBitmapFileData.html">XReadBitmapFileData()</A></B>.<P>To write out a bitmap from a pixmap to a file, use<B><A HREF="XWriteBitmapFile.html">XWriteBitmapFile()</A></B>.<P>To create a pixmap and then store bitmap-format data into it, use<B><A HREF="XCreatePixmapFromBitmapData.html">XCreatePixmapFromBitmapData()</A></B>.<P>To include a bitmap written out by <B><A HREF="XWriteBitmapFile.html">XWriteBitmapFile()</A></B><!.IN "XWriteBitmapFile">in a program directly, as opposed to reading it in every time at run time, use<B><A HREF="XCreateBitmapFromData.html">XCreateBitmapFromData()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="context-manager.html">Using the Context Manager</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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