cfbcmap.c

远程桌面连接工具

    	    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;
    Pixel wp, bp;
    
    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;
    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;
    (*pScreen->InstallColormap)(cmap);
    return TRUE;
}

extern int defaultColorVisualClass;

#define _BZ(d) (d / 3)
#define _BS(d) 0
#define _BM(d) ((1 << _BZ(d)) - 1)
#define _GZ(d) ((d - _BZ(d) + 1) / 2)
#define _GS(d) _BZ(d)
#define _GM(d) (((1 << _GZ(d)) - 1) << _GS(d))
#define _RZ(d) (d - _BZ(d) - _GZ(d))
#define _RS(d) (_BZ(d) + _GZ(d))
#define _RM(d) (((1 << _RZ(d)) - 1) << _RS(d))
#define _CE(d) (1 << _GZ(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:
		if (d == 8) {
		    visual->redMask = 0x07;
		    visual->greenMask = 0x38;
		    visual->blueMask =  0xC0;
		    visual->offsetRed  =  0;
		    visual->offsetGreen = 3;
		    visual->offsetBlue =  6;
		} else {
		    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];

#ifdef GLXEXT
#ifdef GLX_MODULE
    if( GlxInitVisualsPtr != NULL ) 
       return (*GlxInitVisualsPtr)
#else
    return GlxInitVisuals
#endif
	   (
               visualp, 
               depthp,
               nvisualp,
               ndepthp,
               rootDepthp,
               defaultVisp,
               sizes,
               bitsPerRGB
           );
#else
    return TRUE;
#endif

}