ppcRslvC.c   [plain text]

/************************************************************
Copyright 1987 by Sun Microsystems, Inc. Mountain View, CA.

                    All Rights Reserved

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distribution  of  the software  without specific prior 
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implied warranty.

SUN DISCLAIMS ALL WARRANTIES WITH REGARD TO  THIS  SOFTWARE,
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/*
 * Copyright IBM Corporation 1987,1988,1989
 *
 * All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted,
 * 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 IBM not be
 * used in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.
 *
 * IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
 * IBM 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.
 *
*/

/* Generic Color Resolution Scheme
 * P. Shupak 12/31/87
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include "xf4bpp.h"
#include "scrnintstr.h"

/*
 * New colormap routines that can support multiple Visual types.
 */

static unsigned short defstaticpalette[16][3] = {
	/*   R       G       B   */
	{ 0x0000, 0x0000, 0x0000 },	/* black */
	{ 0xFFFF, 0xFFFF, 0xFFFF },	/* white */
	{ 0xAAAA, 0xAAAA, 0xAAAA },	/* grey */
	{ 0x0000, 0x0000, 0xAAAA },	/* dark blue */
	{ 0x0000, 0x0000, 0xFFFF },	/* medium blue */
	{ 0x0000, 0xAAAA, 0xFFFF },	/* light blue */
	{ 0x0000, 0xFFFF, 0xFFFF },	/* cyan */
	{ 0x0000, 0xAAAA, 0x0000 },	/* dark green */
	{ 0x0000, 0xFFFF, 0x0000 },	/* green */
	{ 0xAAAA, 0xFFFF, 0x5555 },	/* pale green */
	{ 0xAAAA, 0x5555, 0x0000 },	/* brown */
	{ 0xFFFF, 0xAAAA, 0x0000 },	/* light brown */
	{ 0xFFFF, 0xFFFF, 0x0000 },	/* yellow */
	{ 0xAAAA, 0x0000, 0xAAAA },	/* purple */
	{ 0xFFFF, 0x0000, 0xFFFF },	/* magenta */
	{ 0xFFFF, 0x0000, 0x0000 },	/* red */
	};

Bool
xf4bppInitializeColormap(pmap)
    register ColormapPtr	pmap;
{
    register unsigned i;
    register VisualPtr pVisual;
    unsigned lim, maxent, shift;

    pVisual = pmap->pVisual;
    lim = (1 << pVisual->bitsPerRGBValue) - 1;
    shift = 16 - pVisual->bitsPerRGBValue;
    maxent = pVisual->ColormapEntries - 1;

    switch( pVisual->class )
	{
	case StaticGray:
	    for ( i = 0 ; i < maxent ; i++ ) {
		pmap->red[i].co.local.red   =
		pmap->red[i].co.local.green =
		pmap->red[i].co.local.blue  =
		    ((((i * 65535) / maxent) >> shift) * 65535) / lim;
	    }
	    break;
	case StaticColor:
	    for ( i = 0 ; i < 16 ; i++ ) {
		pmap->red[i].co.local.red   = (defstaticpalette[i][0]);
		pmap->red[i].co.local.green = (defstaticpalette[i][1]);
		pmap->red[i].co.local.blue  = (defstaticpalette[i][2]);
	    }
	    break;
	case GrayScale:
	case PseudoColor:
	    for(i=0;i<=maxent;i++) {
	        int a,b,c;
		a = i << 10;
		b = i << 12;
		c = i << 14;
		pmap->red[i].co.local.red   = a;
		pmap->red[i].co.local.green = b;
		pmap->red[i].co.local.blue  = c;
	    }
	    break;
	case TrueColor:
	case DirectColor:
	default:
	    ErrorF( "Unsupported Visual class %d\b", pVisual->class );
	    return FALSE;
	}
    return TRUE;
}

void
xf4bppResolveColor( pred, pgreen, pblue, pVisual )
register unsigned short* pred ;
register unsigned short* pgreen ;
register unsigned short* pblue ;
register VisualPtr pVisual ;
{ 
    unsigned lim, maxent, shift;

    lim = (1 << pVisual->bitsPerRGBValue) - 1;
    shift = 16 - pVisual->bitsPerRGBValue;
    maxent = pVisual->ColormapEntries - 1;

    switch( pVisual->class )
	{
	case StaticGray:
	    *pred = (30L * *pred + 59L * *pgreen + 11L * *pblue) / 100;
	    *pred = (((*pred * (maxent + 1)) >> 16) * 65535) / maxent;
	    *pblue = *pgreen = *pred = ((*pred >> shift) * 65535) / lim;
	    break;
	case StaticColor:
	    break;
	case GrayScale:
	    *pred = (30L * *pred + 59L * *pgreen + 11L * *pblue) / 100;
	    *pblue = *pgreen = *pred = ((*pred >> shift) * 65535) / lim;
	    break;
	case PseudoColor:
	    /* rescale to rgb bits */
	    *pred = ((*pred >> shift) * 65535) / lim;
	    *pgreen = ((*pgreen >> shift) * 65535) / lim;
	    *pblue = ((*pblue >> shift) * 65535) / lim;
	    break;
	case TrueColor:
	case DirectColor:
	default:
	    ErrorF( "Unsupported Visual class %d\b", pVisual->class );
	}
}