colormap.c

远程桌面连接工具

/***********************************************************

Copyright (c) 1987  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.


Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        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 Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL 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.

******************************************************************/

/* $XConsortium: colormap.c /main/71 1996/06/17 11:01:33 mor $ */
/* $XFree86: xc/programs/Xserver/dix/colormap.c,v 3.1 1996/12/23 06:29:34 dawes Exp $ */

#include "X.h"
#define NEED_EVENTS
#include "Xproto.h"
#include "misc.h"
#include "dix.h"
#include "colormapst.h"
#include "os.h"
#include "scrnintstr.h"
#include "resource.h"
#include "windowstr.h"

extern XID clientErrorValue;

static Pixel FindBestPixel(
#if NeedFunctionPrototypes
    EntryPtr /*pentFirst*/,
    int /*size*/,
    xrgb * /*prgb*/,
    int /*channel*/
#endif
);

static int AllComp(
#if NeedFunctionPrototypes
    EntryPtr /*pent*/,
    xrgb * /*prgb*/
#endif
);

static int RedComp(
#if NeedFunctionPrototypes
    EntryPtr /*pent*/,
    xrgb * /*prgb*/
#endif
);

static int GreenComp(
#if NeedFunctionPrototypes
    EntryPtr /*pent*/,
    xrgb * /*prgb*/
#endif
);

static int BlueComp(
#if NeedFunctionPrototypes
    EntryPtr /*pent*/,
    xrgb * /*prgb*/
#endif
);

static void FreePixels(
#if NeedFunctionPrototypes
    register ColormapPtr /*pmap*/,
    register int /*client*/
#endif
);

static void CopyFree(
#if NeedFunctionPrototypes
    int /*channel*/,
    int /*client*/,
    ColormapPtr /*pmapSrc*/,
    ColormapPtr /*pmapDst*/
#endif
);

static void FreeCell(
#if NeedFunctionPrototypes
    ColormapPtr /*pmap*/,
    Pixel /*i*/,
    int /*channel*/
#endif
);

static void UpdateColors(
#if NeedFunctionPrototypes
    ColormapPtr /*pmap*/
#endif
);

static int AllocDirect(
#if NeedFunctionPrototypes
    int /*client*/,
    ColormapPtr /*pmap*/,
    int /*c*/,
    int /*r*/,
    int /*g*/,
    int /*b*/,
    Bool /*contig*/,
    Pixel * /*pixels*/,
    Pixel * /*prmask*/,
    Pixel * /*pgmask*/,
    Pixel * /*pbmask*/
#endif
);

static int AllocPseudo(
#if NeedFunctionPrototypes
    int /*client*/,
    ColormapPtr /*pmap*/,
    int /*c*/,
    int /*r*/,
    Bool /*contig*/,
    Pixel * /*pixels*/,
    Pixel * /*pmask*/,
    Pixel ** /*pppixFirst*/
#endif
);

static Bool AllocCP(
#if NeedFunctionPrototypes
    ColormapPtr /*pmap*/,
    EntryPtr /*pentFirst*/,
    int /*count*/,
    int /*planes*/,
    Bool /*contig*/,
    Pixel * /*pixels*/,
    Pixel * /*pMask*/
#endif
);

static Bool AllocShared(
#if NeedFunctionPrototypes
    ColormapPtr /*pmap*/,
    Pixel * /*ppix*/,
    int /*c*/,
    int /*r*/,
    int /*g*/,
    int /*b*/,
    Pixel /*rmask*/,
    Pixel /*gmask*/,
    Pixel /*bmask*/,
    Pixel * /*ppixFirst*/
#endif
);

static int FreeCo(
#if NeedFunctionPrototypes
    ColormapPtr /*pmap*/,
    int /*client*/,
    int /*color*/,
    int /*npixIn*/,
    Pixel * /*ppixIn*/,
    Pixel /*mask*/
#endif
);

static int   TellNoMap(
#if NeedFunctionPrototypes
    WindowPtr	/*pwin*/,
    Colormap 	* /*pmid*/
#endif
);

#define NUMRED(vis) ((vis->redMask >> vis->offsetRed) + 1)
#define NUMGREEN(vis) ((vis->greenMask >> vis->offsetGreen) + 1)
#define NUMBLUE(vis) ((vis->blueMask >> vis->offsetBlue) + 1)
#define RGBMASK(vis) (vis->redMask | vis->greenMask | vis->blueMask)

/* GetNextBitsOrBreak(bits, mask, base)  -- 
 * (Suggestion: First read the macro, then read this explanation.
 *
 * Either generate the next value to OR in to a pixel or break out of this
 * while loop 
 *
 * This macro is used when we're trying to generate all 2^n combinations of
 * bits in mask.  What we're doing here is counting in binary, except that
 * the bits we use to count may not be contiguous.  This macro will be
 * called 2^n times, returning a different value in bits each time. Then
 * it will cause us to break out of a surrounding loop. (It will always be
 * called from within a while loop.)
 * On call: mask is the value we want to find all the combinations for
 * base has 1 bit set where the least significant bit of mask is set
 *
 * For example,if mask is 01010, base should be 0010 and we count like this:
 * 00010 (see this isn't so hard), 
 *     then we add base to bits and get 0100. (bits & ~mask) is (0100 & 0100) so
 *      we add that to bits getting (0100 + 0100) =
 * 01000 for our next value.
 *      then we add 0010 to get 
 * 01010 and we're done (easy as 1, 2, 3)
 */
#define GetNextBitsOrBreak(bits, mask, base)	\
	    if((bits) == (mask)) 		\
		break;		 		\
	    (bits) += (base);		 	\
	    while((bits) & ~(mask))		\
		(bits) += ((bits) & ~(mask));	
/* ID of server as client */
#define SERVER_ID	0

typedef struct _colorResource
{
	Colormap	mid;
	int		client;
} colorResource;

/* Invariants:
 * refcnt == 0 means entry is empty
 * refcnt > 0 means entry is useable by many clients, so it can't be changed
 * refcnt == AllocPrivate means entry owned by one client only
 * fShared should only be set if refcnt == AllocPrivate, and only in red map
 */


/* Create and initialize the color map */
int 
CreateColormap (mid, pScreen, pVisual, ppcmap, alloc, client)
    Colormap	mid;		/* resource to use for this colormap */
    ScreenPtr	pScreen;
    VisualPtr	pVisual;
    ColormapPtr	*ppcmap;	
    int		alloc;		/* 1 iff all entries are allocated writeable */
    int		client;
{
    int		class, size;
    unsigned long sizebytes;
    ColormapPtr	pmap;
    register	EntryPtr	pent;
    int		i;
    register	Pixel	*ppix, **pptr;
    extern int colormapPrivateCount;

    class = pVisual->class;
    if(!(class & DynamicClass) && (alloc != AllocNone) && (client != SERVER_ID))
	return (BadMatch);

    size = pVisual->ColormapEntries;
    sizebytes = (size * sizeof(Entry)) +
		(MAXCLIENTS * sizeof(Pixel *)) +
		(MAXCLIENTS * sizeof(int));
    if ((class | DynamicClass) == DirectColor)
	sizebytes *= 3;
    sizebytes += sizeof(ColormapRec);
    pmap = (ColormapPtr) xalloc(sizebytes);
    if (!pmap)
	return (BadAlloc);
    pmap->red = (EntryPtr)((char *)pmap + sizeof(ColormapRec));    
    sizebytes = size * sizeof(Entry);
    pmap->clientPixelsRed = (Pixel **)((char *)pmap->red + sizebytes);
    pmap->numPixelsRed = (int *)((char *)pmap->clientPixelsRed +
				 (MAXCLIENTS * sizeof(Pixel *)));
    pmap->mid = mid;
    pmap->flags = 0; 	/* start out with all flags clear */
    if(mid == pScreen->defColormap)
	pmap->flags |= IsDefault;
    pmap->pScreen = pScreen;
    pmap->pVisual = pVisual;
    pmap->class = class;
    if ((class | DynamicClass) == DirectColor)
	size = NUMRED(pVisual);
    pmap->freeRed = size;
    bzero ((char *) pmap->red, (int)sizebytes);
    bzero((char *) pmap->numPixelsRed, MAXCLIENTS * sizeof(int));
    for (pptr = &pmap->clientPixelsRed[MAXCLIENTS]; --pptr >= pmap->clientPixelsRed; )
	*pptr = (Pixel *)NULL;
    if (alloc == AllocAll)
    {
	if (class & DynamicClass)
	    pmap->flags |= AllAllocated;
	for (pent = &pmap->red[size - 1]; pent >= pmap->red; pent--)
	    pent->refcnt = AllocPrivate;
	pmap->freeRed = 0;
	ppix = (Pixel *)xalloc(size * sizeof(Pixel));
	if (!ppix)
	{
	    xfree(pmap);
	    return (BadAlloc);
	}
	pmap->clientPixelsRed[client] = ppix;
	for(i = 0; i < size; i++)
	    ppix[i] = i;
	pmap->numPixelsRed[client] = size;
    }

    if ((class | DynamicClass) == DirectColor)
    {
	pmap->freeGreen = NUMGREEN(pVisual);
	pmap->green = (EntryPtr)((char *)pmap->numPixelsRed +
				 (MAXCLIENTS * sizeof(int)));
	pmap->clientPixelsGreen = (Pixel **)((char *)pmap->green + sizebytes);
	pmap->numPixelsGreen = (int *)((char *)pmap->clientPixelsGreen +
				       (MAXCLIENTS * sizeof(Pixel *)));
	pmap->freeBlue = NUMBLUE(pVisual);
	pmap->blue = (EntryPtr)((char *)pmap->numPixelsGreen +
				(MAXCLIENTS * sizeof(int)));
	pmap->clientPixelsBlue = (Pixel **)((char *)pmap->blue + sizebytes);
	pmap->numPixelsBlue = (int *)((char *)pmap->clientPixelsBlue +
				      (MAXCLIENTS * sizeof(Pixel *)));

	bzero ((char *) pmap->green, (int)sizebytes);
	bzero ((char *) pmap->blue, (int)sizebytes);

	memmove((char *) pmap->clientPixelsGreen,
		(char *) pmap->clientPixelsRed,
	      MAXCLIENTS * sizeof(Pixel *));
	memmove((char *) pmap->clientPixelsBlue,
		(char *) pmap->clientPixelsRed,
	      MAXCLIENTS * sizeof(Pixel *));
	bzero((char *) pmap->numPixelsGreen, MAXCLIENTS * sizeof(int));
	bzero((char *) pmap->numPixelsBlue, MAXCLIENTS * sizeof(int));

	/* If every cell is allocated, mark its refcnt */
	if (alloc == AllocAll)
	{
	    size = pmap->freeGreen;
	    for(pent = &pmap->green[size-1]; pent >= pmap->green; pent--)
		pent->refcnt = AllocPrivate;
	    pmap->freeGreen = 0;
	    ppix = (Pixel *) xalloc(size * sizeof(Pixel));
	    if (!ppix)
	    {
		xfree(pmap->clientPixelsRed[client]);
		xfree(pmap);
		return(BadAlloc);
	    }
	    pmap->clientPixelsGreen[client] = ppix;
	    for(i = 0; i < size; i++)
		ppix[i] = i;
	    pmap->numPixelsGreen[client] = size;

	    size = pmap->freeBlue;
	    for(pent = &pmap->blue[size-1]; pent >= pmap->blue; pent--)
		pent->refcnt = AllocPrivate;
	    pmap->freeBlue = 0;
	    ppix = (Pixel *) xalloc(size * sizeof(Pixel));
	    if (!ppix)
	    {
		xfree(pmap->clientPixelsGreen[client]);
		xfree(pmap->clientPixelsRed[client]);
		xfree(pmap);
		return(BadAlloc);
	    }
	    pmap->clientPixelsBlue[client] = ppix;
	    for(i = 0; i < size; i++)
		ppix[i] = i;
	    pmap->numPixelsBlue[client] = size;
	}
    }
    if (!AddResource(mid, RT_COLORMAP, (pointer)pmap))
	return (BadAlloc);
    /* If the device wants a chance to initialize the colormap in any way,
     * this is it.  In specific, if this is a Static colormap, this is the
     * time to fill in the colormap's values */
    pmap->flags |= BeingCreated;


    /*
     * Allocate the array of devPrivate's for this colormap.
     */

    if (colormapPrivateCount == 0)
	pmap->devPrivates = NULL;
    else
    {
	pmap->devPrivates = (DevUnion *) xalloc (
	    colormapPrivateCount * sizeof(DevUnion));

	if (!pmap->devPrivates)
	{
	    FreeResource (mid, RT_NONE);
	    return BadAlloc;
	}
    }

    if (!(*pScreen->CreateColormap)(pmap))
    {
	FreeResource (mid, RT_NONE);
	return BadAlloc;
    }
    pmap->flags &= ~BeingCreated;
    *ppcmap = pmap;
    return (Success);
}

int
FreeColormap (value, mid)
    pointer	value; /* must conform to DeleteType */
    XID		mid;
{
    int		i;
    register EntryPtr pent;
    ColormapPtr	pmap = (ColormapPtr)value;

    if(CLIENT_ID(mid) != SERVER_ID)
    {
        (*pmap->pScreen->UninstallColormap) (pmap);
        WalkTree(pmap->pScreen, (VisitWindowProcPtr)TellNoMap, (pointer) &mid);
    }

    /* This is the device's chance to undo anything it needs to, especially
     * to free any storage it allocated */
    (*pmap->pScreen->DestroyColormap)(pmap);

    if(pmap->clientPixelsRed)
    {
	for(i = 0; i < MAXCLIENTS; i++)
	    xfree(pmap->clientPixelsRed[i]);
    }

    if ((pmap->class == PseudoColor) || (pmap->class == GrayScale))
    {
	for(pent = &pmap->red[pmap->pVisual->ColormapEntries - 1];
	    pent >= pmap->red;
	    pent--)
	{
	    if(pent->fShared)
	    {
		if (--pent->co.shco.red->refcnt == 0)
		    xfree(pent->co.shco.red);
		if (--pent->co.shco.green->refcnt == 0)
		    xfree(pent->co.shco.green);
		if (--pent->co.shco.blue->refcnt == 0)
		    xfree(pent->co.shco.blue);
	    }
	}
    }
    if((pmap->class | DynamicClass) == DirectColor)
    {
        for(i = 0; i < MAXCLIENTS; i++)
	{
            xfree(pmap->clientPixelsGreen[i]);
            xfree(pmap->clientPixelsBlue[i]);
        }
    }

    if (pmap->devPrivates)
	xfree(pmap->devPrivates);

    xfree(pmap);
    return(Success);
}

/* Tell window that pmid has disappeared */
static int
TellNoMap (pwin, pmid)
    WindowPtr	pwin;
    Colormap 	*pmid;
{
    xEvent 	xE;
    if (wColormap(pwin) == *pmid)
    {
	/* This should be call to DeliverEvent */