path: root/cfb/cfbcmap.c

/* $Xorg: cfbcmap.c,v 1.3 2000/08/17 19:48:13 cpqbld Exp $ */
/************************************************************
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,
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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;
{
/* 
 * In the following sources PC X server vendors may want to delete 
 * "_not_tog" from "#ifdef WIN32_not_tog"
 */
#ifdef WIN32_not_tog
    /*  
     * these are the MS-Windows desktop colors, adjusted for X's 16-bit 
     * color specifications.
     */
    static xColorItem citems[] = {
	{   0,      0,      0,      0, 0, 0 },
	{   1, 0x8000,      0,      0, 0, 0 },
	{   2,      0, 0x8000,      0, 0, 0 },
	{   3, 0x8000, 0x8000,      0, 0, 0 },
	{   4,      0,      0, 0x8000, 0, 0 },
	{   5, 0x8000,      0, 0x8000, 0, 0 },
	{   6,      0, 0x8000, 0x8000, 0, 0 },
	{   7, 0xc000, 0xc000, 0xc000, 0, 0 },
	{   8, 0xc000, 0xdc00, 0xc000, 0, 0 },
	{   9, 0xa600, 0xca00, 0xf000, 0, 0 },
	{ 246, 0xff00, 0xfb00, 0xf000, 0, 0 },
	{ 247, 0xa000, 0xa000, 0xa400, 0, 0 },
	{ 248, 0x8000, 0x8000, 0x8000, 0, 0 },
	{ 249, 0xff00,      0,      0, 0, 0 },
	{ 250,      0, 0xff00,      0, 0, 0 },
	{ 251, 0xff00, 0xff00,      0, 0, 0 },
	{ 252,      0,      0, 0xff00, 0, 0 },
	{ 253, 0xff00,      0, 0xff00, 0, 0 },
	{ 254,      0, 0xff00, 0xff00, 0, 0 },
	{ 255, 0xff00, 0xff00, 0xff00, 0, 0 }
    };
#define NUM_DESKTOP_COLORS sizeof citems / sizeof citems[0]
    int i;
#else
    unsigned short	zero = 0, ones = 0xFFFF;
#endif
    Pixel wp, bp;
    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;
    wp = pScreen->whitePixel;
    bp = pScreen->blackPixel;
#ifdef WIN32_not_tog
    for (i = 0; i < NUM_DESKTOP_COLORS; i++) {
	if (AllocColor (cmap, 
			&citems[i].red, &citems[i].green, &citems[i].blue,
			&citems[i].pixel, 0) != Success)
	    return FALSE;
    }
#else
    if ((AllocColor(cmap, &ones, &ones, &ones, &wp, 0) !=
       	   Success) ||
    	(AllocColor(cmap, &zero, &zero, &zero, &bp, 0) !=
       	   Success))
    	return FALSE;
    pScreen->whitePixel = wp;
    pScreen->blackPixel = bp;
#endif
    (*pScreen->InstallColormap)(cmap);
    return TRUE;
}

extern int defaultColorVisualClass;

#define _RZ(d) ((d + 2) / 3)
#define _RS(d) 0
#define _RM(d) ((1 << _RZ(d)) - 1)
#define _GZ(d) ((d - _RZ(d) + 1) / 2)
#define _GS(d) _RZ(d)
#define _GM(d) (((1 << _GZ(d)) - 1) << _GS(d))
#define _BZ(d) (d - _RZ(d) - _GZ(d))
#define _BS(d) (_RZ(d) + _GZ(d))
#define _BM(d) (((1 << _BZ(d)) - 1) << _BS(d))
#define _CE(d) (1 << _RZ(d))

#define MAX_PSEUDO_DEPTH    10	    /* largest DAC size I know */

#define StaticGrayMask	(1 << StaticGray)
#define GrayScaleMask	(1 << GrayScale)
#define StaticColorMask	(1 << StaticColor)
#define PseudoColorMask	(1 << PseudoColor)
#define TrueColorMask	(1 << TrueColor)
#define DirectColorMask (1 << DirectColor)

#define ALL_VISUALS	(StaticGrayMask|\
			 GrayScaleMask|\
			 StaticColorMask|\
			 PseudoColorMask|\
			 TrueColorMask|\
			 DirectColorMask)

#define LARGE_VISUALS	(TrueColorMask|\
			 DirectColorMask)

typedef struct _cfbVisuals {
    struct _cfbVisuals	*next;
    int			depth;
    int			bitsPerRGB;
    int			visuals;
    int			count;
} cfbVisualsRec, *cfbVisualsPtr;

static int  cfbVisualPriority[] = {
    PseudoColor, DirectColor, GrayScale, StaticColor, TrueColor, StaticGray
};

#define NUM_PRIORITY	6

static cfbVisualsPtr	cfbVisuals;

Bool
cfbSetVisualTypes (depth, visuals, bitsPerRGB)
    int	    depth;
    int	    visuals;
{
    cfbVisualsPtr   new, *prev, v;
    int		    count;

    new = (cfbVisualsPtr) xalloc (sizeof *new);
    if (!new)
	return FALSE;
    new->next = 0;
    new->depth = depth;
    new->visuals = visuals;
    new->bitsPerRGB = bitsPerRGB;
    count = (visuals >> 1) & 033333333333;
    count = visuals - count - ((count >> 1) & 033333333333);
    count = (((count + (count >> 3)) & 030707070707) % 077);	/* HAKMEM 169 */
    new->count = count;
    for (prev = &cfbVisuals; v = *prev; prev = &v->next);
    *prev = new;
    return TRUE;
}

/*
 * Given a list of formats for a screen, create a list
 * of visuals and depths for the screen which coorespond to
 * the set which can be used with this version of cfb.
 */

Bool
cfbInitVisuals (visualp, depthp, nvisualp, ndepthp, rootDepthp, defaultVisp, sizes, bitsPerRGB)
    VisualPtr	*visualp;
    DepthPtr	*depthp;
    int		*nvisualp, *ndepthp;
    int		*rootDepthp;
    VisualID	*defaultVisp;
    unsigned long   sizes;
    int		bitsPerRGB;
{
    int		i, j, k;
    VisualPtr	visual;
    DepthPtr	depth;
    VisualID	*vid;
    int		d, b;
    int		f;
    int		ndepth, nvisual;
    int		nvtype;
    int		vtype;
    VisualID	defaultVisual;
    cfbVisualsPtr   visuals, nextVisuals;

    /* none specified, we'll guess from pixmap formats */
    if (!cfbVisuals) 
    {
    	for (f = 0; f < screenInfo.numPixmapFormats; f++) 
    	{
	    d = screenInfo.formats[f].depth;
	    b = screenInfo.formats[f].bitsPerPixel;
	    if (sizes & (1 << (b - 1)))
	    {
	    	if (d > MAX_PSEUDO_DEPTH)
		    vtype = LARGE_VISUALS;
	    	else if (d == 1)
		    vtype = StaticGrayMask;
		else
		    vtype = ALL_VISUALS;
	    }
	    else
		vtype = 0;
	    if (!cfbSetVisualTypes (d, vtype, bitsPerRGB))
		return FALSE;
    	}
    }
    nvisual = 0;
    ndepth = 0;
    for (visuals = cfbVisuals; visuals; visuals = nextVisuals) 
    {
	nextVisuals = visuals->next;
	ndepth++;
	nvisual += visuals->count;
    }
    depth = (DepthPtr) xalloc (ndepth * sizeof (DepthRec));
    visual = (VisualPtr) xalloc (nvisual * sizeof (VisualRec));
    if (!depth || !visual)
    {
	xfree (depth);
	xfree (visual);
	return FALSE;
    }
    *depthp = depth;
    *visualp = visual;
    *ndepthp = ndepth;
    *nvisualp = nvisual;
    for (visuals = cfbVisuals; visuals; visuals = nextVisuals) 
    {
	nextVisuals = visuals->next;
	d = visuals->depth;
	vtype = visuals->visuals;
	nvtype = visuals->count;
	vid = NULL;
	if (nvtype)
	{
	    vid = (VisualID *) xalloc (nvtype * sizeof (VisualID));
	    if (!vid)
		return FALSE;
	}
	depth->depth = d;
	depth->numVids = nvtype;
	depth->vids = vid;
	depth++;
	for (i = 0; i < NUM_PRIORITY; i++) {
	    if (! (vtype & (1 << cfbVisualPriority[i])))
		continue;
	    visual->class = cfbVisualPriority[i];
	    visual->bitsPerRGBValue = visuals->bitsPerRGB;
	    visual->ColormapEntries = 1 << d;
	    visual->nplanes = d;
	    visual->vid = *vid = FakeClientID (0);
	    switch (visual->class) {
	    case PseudoColor:
	    case GrayScale:
	    case StaticGray:
		visual->redMask = 0;
		visual->greenMask =  0;
		visual->blueMask =  0;
		visual->offsetRed  =  0;
		visual->offsetGreen = 0;
		visual->offsetBlue =  0;
		break;
	    case DirectColor:
	    case TrueColor:
		visual->ColormapEntries = _CE(d);
		/* fall through */
	    case StaticColor:
		visual->redMask =  _RM(d);
		visual->greenMask =  _GM(d);
		visual->blueMask =  _BM(d);
		visual->offsetRed  =  _RS(d);
		visual->offsetGreen = _GS(d);
		visual->offsetBlue =  _BS(d);
	    }
	    vid++;
	    visual++;
	}
	xfree (visuals);
    }
    cfbVisuals = NULL;
    visual = *visualp;
    depth = *depthp;
    for (i = 0; i < ndepth; i++)
    {
	if (*rootDepthp && *rootDepthp != depth[i].depth)
	    continue;
	for (j = 0; j < depth[i].numVids; j++)
	{
	    for (k = 0; k < nvisual; k++)
		if (visual[k].vid == depth[i].vids[j])
		    break;
	    if (k == nvisual)
		continue;
	    if (defaultColorVisualClass < 0 ||
		visual[k].class == defaultColorVisualClass)
		break;
	}
	if (j != depth[i].numVids)
	    break;
    }
    if (i == ndepth) {
	i = 0;
	j = 0;
    }
    *rootDepthp = depth[i].depth;
    *defaultVisp = depth[i].vids[j];
    return TRUE;
}