/* $Xorg: XRGB.c,v 1.3 2000/08/17 19:45:04 cpqbld Exp $ */ /* * Code and supporting documentation (c) Copyright 1990 1991 Tektronix, Inc. * All Rights Reserved * * This file is a component of an X Window System-specific implementation * of Xcms based on the TekColor Color Management System. Permission is * hereby granted to use, copy, modify, sell, and otherwise distribute this * software and its documentation for any purpose and without fee, provided * that this copyright, permission, and disclaimer notice is reproduced in * all copies of this software and in supporting documentation. TekColor * is a trademark of Tektronix, Inc. * * Tektronix makes no representation about the suitability of this software * for any purpose. It is provided "as is" and with all faults. * * TEKTRONIX DISCLAIMS ALL WARRANTIES APPLICABLE TO THIS SOFTWARE, * INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE. IN NO EVENT SHALL TEKTRONIX BE LIABLE FOR ANY * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER * RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER IN AN ACTION OF * CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN * CONNECTION WITH THE USE OR THE PERFORMANCE OF THIS SOFTWARE. * * * NAME * XcmsRtoX.c * * DESCRIPTION * Convert color specifications in XcmsRGB format in one array of * XcmsColor structures to RGB in an array of XColor structures. * * */ /* $XFree86: xc/lib/X11/XRGB.c,v 3.3 2001/07/29 05:01:11 tsi Exp $ */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include "Xlibint.h" #include "Xcmsint.h" #include "Cv.h" /* * LOCAL VARIABLES */ static unsigned short const MASK[17] = { 0x0000, /* 0 bitsPerRGB */ 0x8000, /* 1 bitsPerRGB */ 0xc000, /* 2 bitsPerRGB */ 0xe000, /* 3 bitsPerRGB */ 0xf000, /* 4 bitsPerRGB */ 0xf800, /* 5 bitsPerRGB */ 0xfc00, /* 6 bitsPerRGB */ 0xfe00, /* 7 bitsPerRGB */ 0xff00, /* 8 bitsPerRGB */ 0xff80, /* 9 bitsPerRGB */ 0xffc0, /* 10 bitsPerRGB */ 0xffe0, /* 11 bitsPerRGB */ 0xfff0, /* 12 bitsPerRGB */ 0xfff8, /* 13 bitsPerRGB */ 0xfffc, /* 14 bitsPerRGB */ 0xfffe, /* 15 bitsPerRGB */ 0xffff /* 16 bitsPerRGB */ }; /************************************************************************ * * * API PRIVATE ROUTINES * * * ************************************************************************/ /* * NAME * _XcmsRGB_to_XColor - * * SYNOPSIS */ void _XcmsRGB_to_XColor( XcmsColor *pColors, XColor *pXColors, unsigned int nColors) /* * DESCRIPTION * Translates a color specification in XcmsRGBFormat in a XcmsColor * structure to an XColor structure. * * RETURNS * void. */ { for (; nColors--; pXColors++, pColors++) { pXColors->pixel = pColors->pixel; pXColors->red = pColors->spec.RGB.red; pXColors->green = pColors->spec.RGB.green; pXColors->blue = pColors->spec.RGB.blue; pXColors->flags = (DoRed | DoGreen | DoBlue); } } /* * NAME * _XColor_to_XcmsRGB * * SYNOPSIS */ void _XColor_to_XcmsRGB( XcmsCCC ccc, XColor *pXColors, XcmsColor *pColors, unsigned int nColors) /* * DESCRIPTION * Translates an RGB color specification in an XColor * structure to an XcmsRGB structure. * * IMPORTANT NOTE: Bit replication that may have been caused * with ResolveColor() routine in the X Server is undone * here if requested! For example, if red = 0xcaca and the * bits_per_rgb is 8, then spec.RGB.red will be 0xca00. * * RETURNS * void */ { int bits_per_rgb = ccc->visual->bits_per_rgb; for (; nColors--; pXColors++, pColors++) { pColors->spec.RGB.red = (pXColors->red & MASK[bits_per_rgb]); pColors->spec.RGB.green = (pXColors->green & MASK[bits_per_rgb]); pColors->spec.RGB.blue = (pXColors->blue & MASK[bits_per_rgb]); pColors->format = XcmsRGBFormat; pColors->pixel = pXColors->pixel; } } /* * NAME * _XcmsResolveColor * * SYNOPSIS */ void _XcmsResolveColor( XcmsCCC ccc, XcmsColor *pXcmsColor) /* * DESCRIPTION * Uses the X Server ResolveColor() algorithm to * modify values to closest values supported by hardware. * Old algorithm simply masked low-order bits. The new algorithm * has the effect of replicating significant bits into lower order * bits in order to stretch the hardware value into all 16 bits. * * On a display with N-bit DACs, the "hardware" color is computed as: * * ((unsignedlong)(ClientValue >> (16-N)) * 0xFFFF) / ((1 << N) - 1) * * * RETURNS * void. */ { int shift; int max_color; shift = 16 - ccc->visual->bits_per_rgb; max_color = (1 << ccc->visual->bits_per_rgb) - 1; pXcmsColor->spec.RGB.red = ((unsigned long)(pXcmsColor->spec.RGB.red >> shift) * 0xFFFF) / max_color; pXcmsColor->spec.RGB.green = ((unsigned long)(pXcmsColor->spec.RGB.green >> shift) * 0xFFFF) / max_color; pXcmsColor->spec.RGB.blue = ((unsigned long)(pXcmsColor->spec.RGB.blue >> shift) * 0xFFFF) / max_color; } /* * NAME * _XcmsUnresolveColor * * SYNOPSIS */ void _XcmsUnresolveColor( XcmsCCC ccc, XcmsColor *pColor) /* * DESCRIPTION * Masks out insignificant bits. * * RETURNS * void. * * ASSUMPTIONS * format == XcmsRGBFormat */ { int bits_per_rgb = ccc->visual->bits_per_rgb; pColor->spec.RGB.red &= MASK[bits_per_rgb]; pColor->spec.RGB.green &= MASK[bits_per_rgb]; pColor->spec.RGB.blue &= MASK[bits_per_rgb]; } /* * NAME * _XUnresolveColor * * SYNOPSIS */ void _XUnresolveColor( XcmsCCC ccc, XColor *pXColor) /* * DESCRIPTION * Masks out insignificant bits. * * RETURNS * void. */ { int bits_per_rgb = ccc->visual->bits_per_rgb; pXColor->red &= MASK[bits_per_rgb]; pXColor->green &= MASK[bits_per_rgb]; pXColor->blue &= MASK[bits_per_rgb]; }