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Diffstat (limited to 'libX11/src/xcms/XRGB.c')
| -rw-r--r-- | libX11/src/xcms/XRGB.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/libX11/src/xcms/XRGB.c b/libX11/src/xcms/XRGB.c new file mode 100644 index 000000000..0d7e24c7d --- /dev/null +++ b/libX11/src/xcms/XRGB.c @@ -0,0 +1,244 @@ +/* $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]; +} + |