📄 xcmsalloccolor.html
字号:
<HTML><HEAD><TITLE>Xlib Programming Manual: XcmsAllocColor</TITLE></HEAD><BODY><H1 ALIGN=center>XcmsAllocColor</H1><H2>Syntax</H2><!.IN "Allocation" "read-only colormap cells"><!.IN "Read-only colormap cells" "allocating"><!.IN "Color" "allocation"><!.IN "XcmsAllocColor" "" "@DEF@"><CODE><PRE><B><A HREF="conversion-contexts-and-gamut-mapping.html#cmsStatus">Status</A></B> XcmsAllocColor(<B>display</B>, <B>colormap</B>, <B>color_in_out</B>, <B>result_format</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; <A HREF="./#colormap">Colormap</A> <B>colormap</B>; <A HREF="structures.html#XcmsColor">XcmsColor</A> *<B>color_in_out</B>; <A HREF="structures.html#XcmsColor">XcmsColorFormat</A> <B>result_format</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>color_in_out</B><TD> Specifies the color to allocate and returns the pixel and color that is actually used in the colormap.<TR><TD> <B>result_format</B><TD> Specifies the color format for the returned color specification.</TABLE><H2>Description</H2>The<B>XcmsAllocColor()</B>function is similar to<B><A HREF="XAllocColor.html">XAllocColor()</A></B>except the color can be specified in any format.The<B>XcmsAllocColor()</B>function ultimately calls <B><A HREF="XAllocColor.html">XAllocColor()</A></B>to allocate a read-only color cell (colormap entry) with the specified color.<B>XcmsAllocColor()</B>first converts the color specifiedto an RGB value and then passes this to<B><A HREF="XAllocColor.html">XAllocColor()</A></B>.<B>XcmsAllocColor()</B>returns the pixel value of the color cell and the color specificationactually allocated.This returned color specification is the result of converting the RGB valuereturned by <B><A HREF="XAllocColor.html">XAllocColor()</A></B>into the format specified with the result_format argument.If there is no interest in a returned color specification, unnecessary computation can be bypassed if result_format is set to<B><A HREF="structures.html#XcmsRGBFormat">XcmsRGBFormat</A></B>.The corresponding colormap cell is read-only.If this routine returns <B><A HREF="conversion-contexts-and-gamut-mapping.html#cmsStatus">XcmsFailure</A></B>, the color_in_out color specification is left unchanged.<P><B>XcmsAllocColor()</B>can generate a<B>BadColor</B>error.<H2>Diagnostics</H2><TABLE><TR><TD><B>BadColor</B><TD> A value for a Colormap argument does not name a defined Colormap.</TABLE><H2>See also</H2><B><A HREF="XcmsAllocNamedColor.html">XcmsAllocNamedColor()</A></B>,<B><A HREF="XcmsQueryColor.html">XcmsQueryColor()</A></B>,<B><A HREF="XcmsStoreColor.html">XcmsStoreColor()</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 + -