cfbcmap.c

早期freebsd实现

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

                    All Rights Reserved

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SUN DISCLAIMS ALL WARRANTIES WITH REGARD TO  THIS  SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FIT-
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#include "X.h"
#include "Xproto.h"
#include "scrnintstr.h"
#include "colormapst.h"
#include "resource.h"

#ifdef	STATIC_COLOR

static ColormapPtr InstalledMaps[MAXSCREENS];

int
cfbListInstalledColormaps(pScreen, pmaps)
    ScreenPtr	pScreen;
    Colormap	*pmaps;
{
    /* By the time we are processing requests, we can guarantee that there
     * is always a colormap installed */
    *pmaps = InstalledMaps[pScreen->myNum]->mid;
    return (1);
}


void
cfbInstallColormap(pmap)
    ColormapPtr	pmap;
{
    int index = pmap->pScreen->myNum;
    ColormapPtr oldpmap = InstalledMaps[index];

    if(pmap != oldpmap)
    {
	/* Uninstall pInstalledMap. No hardware changes required, just
	 * notify all interested parties. */
	if(oldpmap != (ColormapPtr)None)
	    WalkTree(pmap->pScreen, TellLostMap, (char *)&oldpmap->mid);
	/* Install pmap */
	InstalledMaps[index] = pmap;
	WalkTree(pmap->pScreen, TellGainedMap, (char *)&pmap->mid);

    }
}

void
cfbUninstallColormap(pmap)
    ColormapPtr	pmap;
{
    int index = pmap->pScreen->myNum;
    ColormapPtr curpmap = InstalledMaps[index];

    if(pmap == curpmap)
    {
	if (pmap->mid != pmap->pScreen->defColormap)
	{
	    curpmap = (ColormapPtr) LookupIDByType(pmap->pScreen->defColormap,
						   RT_COLORMAP);
	    (*pmap->pScreen->InstallColormap)(curpmap);
	}
    }
}

#endif

void
cfbResolveColor(pred, pgreen, pblue, pVisual)
    unsigned short	*pred, *pgreen, *pblue;
    register VisualPtr	pVisual;
{
    int shift = 16 - pVisual->bitsPerRGBValue;
    unsigned lim = (1 << pVisual->bitsPerRGBValue) - 1;

    if ((pVisual->class == PseudoColor) || (pVisual->class == DirectColor))
    {
	/* rescale to rgb bits */
	*pred = ((*pred >> shift) * 65535) / lim;
	*pgreen = ((*pgreen >> shift) * 65535) / lim;
	*pblue = ((*pblue >> shift) * 65535) / lim;
    }
    else if (pVisual->class == GrayScale)
    {
	/* rescale to gray then rgb bits */
	*pred = (30L * *pred + 59L * *pgreen + 11L * *pblue) / 100;
	*pblue = *pgreen = *pred = ((*pred >> shift) * 65535) / lim;
    }
    else if (pVisual->class == StaticGray)
    {
	unsigned limg = pVisual->ColormapEntries - 1;
	/* rescale to gray then [0..limg] then [0..65535] then rgb bits */
	*pred = (30L * *pred + 59L * *pgreen + 11L * *pblue) / 100;
	*pred = ((((*pred * (limg + 1))) >> 16) * 65535) / limg;
	*pblue = *pgreen = *pred = ((*pred >> shift) * 65535) / lim;
    }
    else
    {
	unsigned limr, limg, limb;

	limr = pVisual->redMask >> pVisual->offsetRed;
	limg = pVisual->greenMask >> pVisual->offsetGreen;
	limb = pVisual->blueMask >> pVisual->offsetBlue;
	/* rescale to [0..limN] then [0..65535] then rgb bits */
	*pred = ((((((*pred * (limr + 1)) >> 16) *
		    65535) / limr) >> shift) * 65535) / lim;
	*pgreen = ((((((*pgreen * (limg + 1)) >> 16) *
		      65535) / limg) >> shift) * 65535) / lim;
	*pblue = ((((((*pblue * (limb + 1)) >> 16) *
		     65535) / limb) >> shift) * 65535) / lim;
    }
}

Bool
cfbInitializeColormap(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;
    if (pVisual->class == TrueColor)
    {
	unsigned limr, limg, limb;

	limr = pVisual->redMask >> pVisual->offsetRed;
	limg = pVisual->greenMask >> pVisual->offsetGreen;
	limb = pVisual->blueMask >> pVisual->offsetBlue;
	for(i = 0; i <= maxent; i++)
	{
	    /* rescale to [0..65535] then rgb bits */
	    pmap->red[i].co.local.red =
		((((i * 65535) / limr) >> shift) * 65535) / lim;
	    pmap->green[i].co.local.green =
		((((i * 65535) / limg) >> shift) * 65535) / lim;
	    pmap->blue[i].co.local.blue =
		((((i * 65535) / limb) >> shift) * 65535) / lim;
	}
    }
    else if (pVisual->class == StaticColor)
    {
	unsigned limr, limg, limb;

	limr = pVisual->redMask >> pVisual->offsetRed;
	limg = pVisual->greenMask >> pVisual->offsetGreen;
	limb = pVisual->blueMask >> pVisual->offsetBlue;
	for(i = 0; i <= maxent; i++)
	{
	    /* rescale to [0..65535] then rgb bits */
	    pmap->red[i].co.local.red =
		((((((i & pVisual->redMask) >> pVisual->offsetRed)
		    * 65535) / limr) >> shift) * 65535) / lim;
	    pmap->red[i].co.local.green =
		((((((i & pVisual->greenMask) >> pVisual->offsetGreen)
		    * 65535) / limg) >> shift) * 65535) / lim;
	    pmap->red[i].co.local.blue =
		((((((i & pVisual->blueMask) >> pVisual->offsetBlue)
		    * 65535) / limb) >> shift) * 65535) / lim;
	}
    }
    else if (pVisual->class == StaticGray)
    {
	for(i = 0; i <= maxent; i++)
	{
	    /* rescale to [0..65535] then rgb bits */
	    pmap->red[i].co.local.red = ((((i * 65535) / maxent) >> shift)
					 * 65535) / lim;
	    pmap->red[i].co.local.green = pmap->red[i].co.local.red;
	    pmap->red[i].co.local.blue = pmap->red[i].co.local.red;
	}
    }
    return TRUE;
}

/* When simulating DirectColor on PseudoColor hardware, multiple
   entries of the colormap must be updated
 */

#define AddElement(mask) { \
    pixel = red | green | blue; \
    for (i = 0; i < nresult; i++) \
  	if (outdefs[i].pixel == pixel) \
    	    break; \
    if (i == nresult) \
    { \
   	nresult++; \
	outdefs[i].pixel = pixel; \
	outdefs[i].flags = 0; \
    } \
    outdefs[i].flags |= (mask); \
    outdefs[i].red = pmap->red[red >> pVisual->offsetRed].co.local.red; \
    outdefs[i].green = pmap->green[green >> pVisual->offsetGreen].co.local.green; \
    outdefs[i].blue = pmap->blue[blue >> pVisual->offsetBlue].co.local.blue; \
}

cfbExpandDirectColors (pmap, ndef, indefs, outdefs)
    ColormapPtr	pmap;
    int		ndef;
    xColorItem	*indefs, *outdefs;
{
    int		    minred, mingreen, minblue;
    register int    red, green, blue;
    int		    maxred, maxgreen, maxblue;
    int		    stepred, stepgreen, stepblue;
    VisualPtr	    pVisual;
    register int    pixel;
    register int    nresult;
    register int    i;

    pVisual = pmap->pVisual;

    stepred = 1 << pVisual->offsetRed;
    stepgreen = 1 << pVisual->offsetGreen;
    stepblue = 1 << pVisual->offsetBlue;
    maxred = pVisual->redMask;
    maxgreen = pVisual->greenMask;
    maxblue = pVisual->blueMask;
    nresult = 0;
    for (;ndef--; indefs++)
    {
	if (indefs->flags & DoRed)
	{
	    red = indefs->pixel & pVisual->redMask;
    	    for (green = 0; green <= maxgreen; green += stepgreen)
    	    {
	    	for (blue = 0; blue <= maxblue; blue += stepblue)
	    	{
		    AddElement (DoRed)
	    	}
    	    }
	}
	if (indefs->flags & DoGreen)
	{
	    green = indefs->pixel & pVisual->greenMask;
    	    for (red = 0; red <= maxred; red += stepred)
    	    {
	    	for (blue = 0; blue <= maxblue; blue += stepblue)
	    	{
		    AddElement (DoGreen)
	    	}
    	    }
	}
	if (indefs->flags & DoBlue)
	{
	    blue = indefs->pixel & pVisual->blueMask;
    	    for (red = 0; red <= maxred; red += stepred)
    	    {
	    	for (green = 0; green <= maxgreen; green += stepgreen)
	    	{
		    AddElement (DoBlue)
	    	}
    	    }
	}
    }
    return nresult;
}

Bool
cfbCreateDefColormap(pScreen)
    ScreenPtr pScreen;
{
    unsigned short	zero = 0, ones = 0xFFFF;
    VisualPtr	pVisual;
    ColormapPtr	cmap;
    
    for (pVisual = pScreen->visuals;
	 pVisual->vid != pScreen->rootVisual;
	 pVisual++)
	;

    if (CreateColormap(pScreen->defColormap, pScreen, pVisual, &cmap,
		       (pVisual->class & DynamicClass) ? AllocNone : AllocAll,
		       0)
	!= Success)
	return FALSE;
    if ((AllocColor(cmap, &zero, &zero, &zero, &(pScreen->blackPixel), 0) !=
       	   Success) ||
    	(AllocColor(cmap, &ones, &ones, &ones, &(pScreen->whitePixel), 0) !=
       	   Success))
    	return FALSE;
    (*pScreen->InstallColormap)(cmap);
    return TRUE;
}