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<HTML><HEAD><TITLE>Xlib Programming Manual: Screen Information Macros</TITLE></HEAD><BODY><H1 ALIGN=center>2.2.3. Screen Information Macros</H1>The following lists the C language macros,their corresponding function equivalents that are for other language bindings,and what data they both can return.These macros or functions all take a pointer to the appropriate screenstructure.<A NAME="BlackPixelOfScreen"></A><H3>BlackPixelOfScreen</H3><CODE><PRE>BlackPixelOfScreen(<B>screen</B>)unsigned long XBlackPixelOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "BlackPixelOfScreen" "" "@DEF@"><!.IN "XBlackPixelOfScreen" "" "@DEF@">Both return the black pixel value of the specified screen.<A NAME="WhitePixelOfScreen"></A><H3>WhitePixelOfScreen</H3> <P><CODE><PRE>WhitePixelOfScreen(<B>screen</B>)unsigned long XWhitePixelOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "WhitePixelOfScreen" "" "@DEF@"><!.IN "XWhitePixelOfScreen" "" "@DEF@">Both return the white pixel value of the specified screen.<A NAME="CellsOfScreen"></A><H3>CellsOfScreen</H3><CODE><PRE>CellsOfScreen(<B>screen</B>)int XCellsOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "CellsOfScreen" "" "@DEF@"><!.IN "XCellsOfScreen" "" "@DEF@">Both return the number of colormap cells in the default colormap of the specified screen.<A NAME="DefaultColormapOfScreen"></A><H3>DefaultColormapOfScreen</H3><CODE><PRE>DefaultColormapOfScreen(<B>screen</B>)Colormap XDefaultColormapOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "DefaultColormapOfScreen" "" "@DEF@"><!.IN "XDefaultColormapOfScreen" "" "@DEF@">Both return the default colormap of the specified screen.<A NAME="DefaultDepthOfScreen"></A><H3>DefaultDepthOfScreen</H3><CODE><PRE>DefaultDepthOfScreen(<B>screen</B>)int XDefaultDepthOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "DefaultDepthOfScreen" "" "@DEF@"><!.IN "XDefaultDepthOfScreen" "" "@DEF@">Both return the depth of the root window.<A NAME="DefaultGCOfScreen"></A><H3>DefaultGCOfScreen</H3><CODE><PRE>DefaultGCOfScreen(<B>screen</B>)GC XDefaultGCOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "DefaultGCOfScreen" "" "@DEF@"><!.IN "XDefaultGCOfScreen" "" "@DEF@">Both return a default graphics context (GC) of the specified screen,which has the same depth as the root window of the screen.The GC must never be freed.<A NAME="DefaultVisualOfScreen"></A><H3>DefaultVisualOfScreen</H3><CODE><PRE>DefaultVisualOfScreen(<B>screen</B>)Visual *XDefaultVisualOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "DefaultVisualOfScreen" "" "@DEF@"><!.IN "XDefaultVisualOfScreen" "" "@DEF@">Both return the default visual of the specified screen.For information on visual types,see "<A HREF="../window/visual-types.html">Visual Types</A>".<A NAME="DoesBackingStore"></A><H3>DoesBackingStore</H3><CODE><PRE>DoesBackingStore(<B>screen</B>)int XDoesBackingStore(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "DoesBackingStore" "" "@DEF@"><!.IN "XDoesBackingStore" "" "@DEF@">Both return a value indicating whether the screen supports backingstores.The value returned can be one of <B>WhenMapped</B>,<B>NotUseful</B>,or<B>Always</B>(see "<A HREF="../window/attributes/backing-store.html">Backing Store Attribute</A>").<A NAME="DoesSaveUnders"></A><H3>DoesSaveUnders</H3><CODE><PRE>DoesSaveUnders(<B>screen</B>)Bool XDoesSaveUnders(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "DoesSaveUnders" "" "@DEF@"><!.IN "XDoesSaveUnders" "" "@DEF@">Both return a Boolean value indicating whether thescreen supports save unders.If<B>True</B>,the screen supports save unders.If<B>False</B>,the screen does not support save unders (see "<A HREF="../window/attributes/save-under.html">Save Under Flag</A>").<A NAME="DisplayOfScreen"></A><H3>DisplayOfScreen</H3><CODE><PRE>DisplayOfScreen(<B>screen</B>)Display *XDisplayOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "DisplayOfScreen" "" "@DEF@"><!.IN "XDisplayOfScreen" "" "@DEF@">Both return the display of the specified screen.<A NAME="ScreenNumberOfScreen"></A><H3>ScreenNumberOfScreen</H3><!.IN "XScreenNumberOfScreen" "" "@DEF@">.FD 0int XScreenNumberOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;.FN.IP <B>screen</B> 1iSpecifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P>The<B>XScreenNumberOfScreen()</B>function returns the screen index number of the specified screen.<A NAME="EventMaskOfScreen"></A><H3>EventMaskOfScreen</H3><CODE><PRE>EventMaskOfScreen(<B>screen</B>)long XEventMaskOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "EventMaskOfScreen" "" "@DEF@"><!.IN "XEventMaskOfScreen" "" "@DEF@">Both return the event mask of the root window for the specified screenat connection setup time.<A NAME="WidthOfScreen"></A><H3>WidthOfScreen</H3><CODE><PRE>WidthOfScreen(<B>screen</B>)int XWidthOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "WidthOfScreen" "" "@DEF@"><!.IN "XWidthOfScreen" "" "@DEF@">Both return the width of the specified screen in pixels.<A NAME="HeightOfScreen"></A><H3>HeightOfScreen</H3><CODE><PRE>HeightOfScreen(<B>screen</B>)int XHeightOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "HeightOfScreen" "" "@DEF@"><!.IN "XHeightOfScreen" "" "@DEF@">Both return the height of the specified screen in pixels.<A NAME="WidthMMOfScreen"></A><H3>WidthMMOfScreen</H3><CODE><PRE>WidthMMOfScreen(<B>screen</B>)int XWidthMMOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "WidthMMOfScreen" "" "@DEF@"><!.IN "XWidthMMOfScreen" "" "@DEF@">Both return the width of the specified screen in millimeters.<A NAME="HeightMMOfScreen"></A><H3>HeightMMOfScreen</H3><CODE><PRE>HeightMMOfScreen(<B>screen</B>)int XHeightMMOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "HeightMMOfScreen" "" "@DEF@"><!.IN "XHeightMMOfScreen" "" "@DEF@">Both return the height of the specified screen in millimeters.<A NAME="MaxCmapsOfScreen"></A><H3>MaxCmapsOfScreen</H3><CODE><PRE>MaxCmapsOfScreen(<B>screen</B>)int XMaxCmapsOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "MaxCmapsOfScreen" "" "@DEF@"><!.IN "XMaxCmapsOfScreen" "" "@DEF@">Both return the maximum number of installed colormaps supported by the specified screen(see "<A HREF="../window-and-session-manager/managing-installed-colormap.html">Managing Installed Colormaps</A>").<A NAME="MinCmapsOfScreen"></A><H3>MinCmapsOfScreen</H3><CODE><PRE>MinCmapsOfScreen(<B>screen</B>)int XMinCmapsOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "MinCmapsOfScreen" "" "@DEF@"><!.IN "XMinCmapsOfScreen" "" "@DEF@">Both return the minimum number of installed colormaps supported by the specified screen (see "<A HREF="../window-and-session-manager/managing-installed-colormap.html">Managing Installed Colormaps</A>").<A NAME="PlanesOfScreen"></A><H3>PlanesOfScreen</H3><CODE><PRE>PlanesOfScreen(<B>screen</B>)int XPlanesOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "PlanesOfScreen" "" "@DEF@"><!.IN "XPlanesOfScreen" "" "@DEF@">Both return the depth of the root window.<A NAME="RootWindowOfScreen"></A><H3>RootWindowOfScreen</H3><CODE><PRE>RootWindowOfScreen(<B>screen</B>)Window XRootWindowOfScreen(<B>screen</B>) <A HREF="opening.html#Screen">Screen</A> *<B>screen</B>;</PRE></CODE><TABLE><TR><TD> <B>screen</B><TD> Specifies the appropriate <A HREF="opening.html#Screen">Screen</A>structure.</TABLE><P><!.IN "RootWindowOfScreen" "" "@DEF@"><!.IN "XRootWindowOfScreen" "" "@DEF@">Both return the root window of the specified screen.<H5 ALIGN=right><I>Next: <A HREF="XNoOp.html">Generating a NoOperation Protocol Request</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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