unixcmap.c

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

#include "hxtypes.h"
#include "hxcom.h"
#include <X11/Xlib.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include "unixcmap.h"

#define MAX_COLORS 256

XColor gHXCurrentColors[MAX_COLORS];
Colormap gHXColormap = 0;

Colormap HXGetXColormap(Display* pDisplay, Window window)
{
    XWindowAttributes attr;

    XGetWindowAttributes(pDisplay, window, &attr);

    return attr.colormap;
}

static void HXInitXColormap(Display* pDisplay, Colormap cmap)
{
    int i;
    for (i=0; i<MAX_COLORS; i++)
    {
	gHXCurrentColors[i].pixel = i;
    }
    gHXColormap = cmap;
    if (pDisplay && cmap)
    {
	XQueryColors(pDisplay, cmap,
	    gHXCurrentColors,
	    MAX_COLORS);
    }
}

static int Distance(XColor c1, XColor c2)
{
    return abs(c1.red - c2.red) + 
	   abs(c1.green - c2.green) + 
	   abs(c1.blue - c2.blue);
}

void HXFindBestXColor(Display* pDisplay, Colormap cmap, XColor* desired)
{
    BOOL foundMatch = FALSE;

    XColor bestMatch = gHXCurrentColors[0];
    unsigned int i, distance = ~0;


    if (desired)
    {
	if (XAllocColor(pDisplay, cmap, desired))
	{
	    return;
	} else if (cmap == gHXColormap) {
	    for (i=0; i<MAX_COLORS; i++)
	    {
		if (Distance(*desired, gHXCurrentColors[i]) < distance)
		{
		    bestMatch = gHXCurrentColors[i];
		    distance = Distance(*desired, gHXCurrentColors[i]);
		    foundMatch = TRUE;
		}
	    }
	}
    }

    if (foundMatch)
    {
	*desired = bestMatch;
    } else {
	HXInitXColormap(pDisplay, cmap);
	HXFindBestXColor(pDisplay, cmap, desired);
    }
}