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<HTML><HEAD><TITLE>Xlib Programming Manual: Determining the Appropriate Visual Type</TITLE></HEAD><BODY><H1 ALIGN=center>16.7 Determining the Appropriate Visual Type</H1>A single display can support multiple screens.Each screen can have several different visual types supported at different depths.You can use the functions described in this section to determinewhich visual to use for your application.<A NAME="XVisualInfo"></A><!.IN "XVisualInfo" "" "@DEF@"><P>The functions in this section use the visual information masks and the<B>XVisualInfo</B>structure,which is defined in<B><TT>X11/Xutil.h</TT></B>and contains:<P><PRE><CODE>/* Visual information mask bits */#define <B>VisualNoMask</B> 0x0#define <B>VisualIDMask</B> 0x1#define <B>VisualScreenMask</B> 0x2#define <B>VisualDepthMask</B> 0x4#define <B>VisualClassMask</B> 0x8#define <B>VisualRedMaskMask</B> 0x10#define <B>VisualGreenMaskMask</B> 0x20#define <B>VisualBlueMaskMask</B> 0x40#define <B>VisualColormapSizeMask</B> 0x80#define <B>VisualBitsPerRGBMask</B> 0x100#define <B>VisualAllMask</B> 0x1FF/* Values */typedef struct { <A HREF="../window/visual-types.html#Visual">Visual</A> *visual; VisualID visualid; int screen; unsigned int depth; int class; unsigned long red_mask; unsigned long green_mask; unsigned long blue_mask; int colormap_size; int bits_per_rgb;} XVisualInfo;</PRE></CODE><P>To obtain a list of visual information structures that match a specifiedtemplate, use<B><A HREF="XGetVisualInfo.html">XGetVisualInfo()</A></B>.<P>To obtain the visual information that matches the specified depth andclass of the screen, use<B><A HREF="XMatchVisualInfo.html">XMatchVisualInfo()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="manipulating-images.html">Manipulating Images</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>?? 快捷鍵說明
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