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<HTML><HEAD><TITLE>Xlib Programming Manual: Color Specification Conversion Callback</TITLE></HEAD><BODY><H1 ALIGN=center>6.12.6 Color Specification Conversion Callback</H1>Callback functions in the<B><A HREF="creating-additional-spaces.html#XcmsColorSpace">XcmsColorSpace</A></B>structure for converting a color specification between device-independentspaces must adhere to thefollowing software interface specification:<CODE><PRE><B><A HREF="../conversion-contexts-and-gamut-mapping.html#cmsStatus">Status</A></B> ConversionProc(<B>ccc</B>, <B>white_point</B>, <B>colors_in_out</B>, <B>ncolors</B>) <A HREF="../CCC/macros.html">XcmsCCC</A> <B>ccc</B>; <A HREF="../structures.html#XcmsColor">XcmsColor</A> *<B>white_point</B>; <A HREF="../structures.html#XcmsColor">XcmsColor</A> *<B>colors_in_out</B>; unsigned int <B>ncolors</B>;</PRE></CODE><TABLE><TR><TD> <B>ccc</B><TD>Specifies the CCC.<TR><TD> <B>white_point</B><TD>Specifies the white point associated with color specifications.The pixel member should be ignored,and the entire structure remain unchanged upon return.<TR><TD> <B>colors_in_out</B><TD>Specifies an array of color specifications.Pixel members should be ignored and must remain unchanged upon return.<TR><TD> <B>ncolors</B><TD>Specifies the number of <A HREF="../structures.html#XcmsColor">XcmsColor</A>structures in the color specification array.</TABLE><P>Callback functions in the<B><A HREF="creating-additional-spaces.html#XcmsColorSpace">XcmsColorSpace</A></B>structure for converting a color specification to or from a device-dependentspace must adhere to thefollowing software interface specification:<CODE><PRE><B><A HREF="../conversion-contexts-and-gamut-mapping.html#cmsStatus">Status</A></B> ConversionProc(<B>ccc</B>, <B>colors_in_out</B>, <B>ncolors</B>, <B>compression_flags_return</B>) <A HREF="../CCC/macros.html">XcmsCCC</A> <B>ccc</B>; <A HREF="../structures.html#XcmsColor">XcmsColor</A> *<B>colors_in_out</B>; unsigned int <B>ncolors</B>; Bool <B>compression_flags_return</B>[];</PRE></CODE><TABLE><TR><TD> <B>ccc</B><TD> Specifies the CCC.<TR><TD> <B>colors_in_out</B><TD> Specifies an array of color specifications.Pixel members should be ignored and must remain unchanged upon return.<TR><TD> <B>ncolors</B><TD> Specifies the number of <A HREF="../structures.html#XcmsColor">XcmsColor</A>structures in the color specification array.<TR><TD> <B>compression_flags_return</B><TD> Returns an array of Boolean values for indicating compression status.If a non-NULL pointer is suppliedand a color at a given index is compressed, then<B>True</B>should be stored at the corresponding index in this array;otherwise, the array should not be modified.</TABLE>Conversion functions are available globally for use by other colorspaces.The conversion functions provided by Xlib are:<TABLE><TR><TD COLSPAN=3><HR><TR><TD><B>Function</B> <TD><B>Converts from</B> <TD><B>Converts to</B><TR><TD COLSPAN=3><HR><TR><TD> <B>XcmsCIELabToCIEXYZ()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIELabFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEXYZFormat</A></B><TR><TD> <B>XcmsCIELuvToCIEuvY()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIELuvFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEuvYFormat</A></B><TR><TD> <B>XcmsCIEXYZToCIELab()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEXYZFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIELabFormat</A></B><TR><TD> <B>XcmsCIEXYZToCIEuvY()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEXYZFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEuvYFormat</A></B><TR><TD> <B>XcmsCIEXYZToCIExyY()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEXYZFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIExyYFormat</A></B><TR><TD> <B>XcmsCIEXYZToRGBi()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEXYZFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsRGBiFormat</A></B><TR><TD> <B>XcmsCIEuvYToCIELuv()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEuvYFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIELabFormat</A></B><TR><TD> <B>XcmsCIEuvYToCIEXYZ()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEuvYFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEXYZFormat</A></B><TR><TD> <B>XcmsCIEuvYToTekHVC()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEuvYFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsTekHVCFormat</A></B><TR><TD> <B>XcmsCIExyYToCIEXYZ()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIExyYFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEXYZFormat</A></B><TR><TD> <B>XcmsRGBToRGBi()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsRGBFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsRGBiFormat</A></B><TR><TD> <B>XcmsRGBiToCIEXYZ()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsRGBiFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEXYZFormat</A></B><TR><TD> <B>XcmsRGBiToRGB()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsRGBiFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsRGBFormat</A></B><TR><TD> <B>XcmsTekHVCToCIEuvY()</B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsTekHVCFormat</A></B> <TD><B><A HREF="../structures.html#XcmsRGBFormat">XcmsCIEuvYFormat</A></B><TR><TD COLSPAN=3><HR></TABLE><H5 ALIGN=right><I>Next: <A HREF="function-sets.html">Function Sets</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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