IABSD.fr/xenocara/lib/libXrender/src/Color.c

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• Author : matthieu
  Date : 2006-11-25 17:54:58
  Hash : bb1ca957
  Message : import from X.Org 7.2RC1

• lib/libXrender/src/Color.c

• /*
   *
   * Copyright © 2002 Keith Packard
   *
   * Permission to use, copy, modify, distribute, and sell this software and its
   * documentation for any purpose is hereby granted without fee, provided that
   * the above copyright notice appear in all copies and that both that
   * copyright notice and this permission notice appear in supporting
   * documentation, and that the name of Keith Packard not be used in
   * advertising or publicity pertaining to distribution of the software without
   * specific, written prior permission.  Keith Packard makes no
   * representations about the suitability of this software for any purpose.  It
   * is provided "as is" without express or implied warranty.
   *
   * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
   * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
   * EVENT SHALL KEITH PACKARD 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
   * PERFORMANCE OF THIS SOFTWARE.
   */
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  #include "Xrenderint.h"
  
  Status
  XRenderParseColor(Display *dpy, char *spec, XRenderColor *def)
  {
      
      if (!strncmp (spec, "rgba:", 5))
      {
  	unsigned short	elements[4];
  	unsigned short	*pShort;
  	int		i, n;
  	char		c;
  	
  	spec += 5;
  	/*
  	 * Attempt to parse the value portion.
  	 */
  	pShort = elements;
  	for (i = 0; i < 4; i++, pShort++, spec++) {
  	    n = 0;
  	    *pShort = 0;
  	    while (*spec != '/' && *spec != '\0') {
  		if (++n > 4) {
  		    return 0;
  		}
  		c = *spec++;
  		*pShort <<= 4;
  		if (c >= '0' && c <= '9')
  		    *pShort |= c - '0';
  		/* assume string in lowercase
  		else if (c >= 'A' && c <= 'F')
  		    *pShort |= c - ('A' - 10);
  		*/
  		else if (c >= 'a' && c <= 'f')
  		    *pShort |= c - ('a' - 10);
  		else return 0;
  	    }
  	    if (n == 0)
  		return 0;
  	    if (n < 4) {
  		*pShort = ((unsigned long)*pShort * 0xFFFF) / ((1 << n*4) - 1);
  	    }
  	}
  	def->red = elements[0];
  	def->green = elements[1];
  	def->blue = elements[2];
  	def->alpha = elements[3];
      }
      else
      {
  	XColor	    coreColor;
  	Colormap    colormap;
  	
  	colormap = DefaultColormap (dpy, DefaultScreen (dpy));
  	if (!XParseColor (dpy, colormap, spec, &coreColor))
  	    return 0;
  	def->red = coreColor.red;
  	def->green = coreColor.green;
  	def->blue = coreColor.blue;
  	def->alpha = 0xffff;
      }
      def->red = (def->red * def->alpha) / 65535;
      def->green = (def->green * def->alpha) / 65535;
      def->blue = (def->blue * def->alpha) / 65535;
      return 1;
  }