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/*
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Copyright 1990, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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*/
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/*
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* Author: Keith Packard, MIT X Consortium
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <X11/Xlib.h>
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#include <stdlib.h>
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#include <X11/Xutil.h>
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#include <X11/Xmu/StdCmap.h>
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/*
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* Distinguishable colors routine. Determines if two colors are
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* distinguishable or not. Somewhat arbitrary meaning.
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*/
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#define MIN_DISTINGUISH 10000.0
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Bool
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XmuDistinguishableColors(XColor *colors, int count)
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{
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double deltaRed, deltaGreen, deltaBlue;
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double dist;
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int i, j;
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for (i = 0; i < count - 1; i++)
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for (j = i + 1; j < count; j++)
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{
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deltaRed = (double)colors[i].red - (double)colors[j].red;
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deltaGreen = (double)colors[i].green - (double)colors[j].green;
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deltaBlue = (double)colors[i].blue - (double)colors[j].blue;
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dist = deltaRed * deltaRed +
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deltaGreen * deltaGreen +
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deltaBlue * deltaBlue;
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if (dist <= MIN_DISTINGUISH * MIN_DISTINGUISH)
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return False;
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}
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return True;
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}
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Bool
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XmuDistinguishablePixels(Display *dpy, Colormap cmap,
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unsigned long *pixels, int count)
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{
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XColor *defs;
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int i, j;
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Bool ret;
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for (i = 0; i < count - 1; i++)
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for (j = i + 1; j < count; j++)
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if (pixels[i] == pixels[j])
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return False;
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defs = (XColor *) malloc (count * sizeof (XColor));
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if (!defs)
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return False;
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for (i = 0; i < count; i++)
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defs[i].pixel = pixels[i];
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XQueryColors (dpy, cmap, defs, count);
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ret = XmuDistinguishableColors (defs, count);
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free ((char *) defs);
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return ret;
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}
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