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  98. A collection of cfb24 cleanups (Marc La France).
  97. Fix unaligned accesses in cfb's horizontal polysegment drawing
      (Shin Takemura).
  96. Finish Keith Packard's removal of 64-bit accesses to cfb framebuffers
      (Marc La France).

/* $XFree86: xc/programs/Xserver/cfb/cfbsetsp.c,v 3.8tsi Exp $ */
/***********************************************************

Copyright 1987, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

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
OPEN GROUP 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 Open Group 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 Open Group.


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.

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

#include <X11/X.h>
#include <X11/Xmd.h>
#include "servermd.h"

#include "misc.h"
#include "regionstr.h"
#include "gcstruct.h"
#include "windowstr.h"
#include "pixmapstr.h"
#include "scrnintstr.h"

#include "cfb.h"
#include "cfbmskbits.h"
#include "mergerop.h"

/* cfbSetScanline -- copies the bits from psrc to the drawable starting at
 * (xStart, y) and continuing to (xEnd, y).  xOrigin tells us where psrc 
 * starts on the scanline. (I.e., if this scanline passes through multiple
 * boxes, we may not want to start grabbing bits at psrc but at some offset
 * further on.) 
 */
/*
    int			xOrigin;	where this scanline starts
    int			xStart;		first bit to use from scanline
    int			xEnd;		last bit to use from scanline + 1
    int			alu;		raster op
    int			*pdstBase;	start of the drawable
    int			widthDst;	width of drawable in words
*/

void
cfbSetScanline(int y, int xOrigin, int xStart, int xEnd, unsigned int *psrc,
	       int alu, int *pdstBase, int widthDst, unsigned long planemask)
{
    int			w;		/* width of scanline in bits */
    int	*pdst;		/* where to put the bits */
    int	tmpSrc;		/* scratch buffer to collect bits in */
    int			offSrc;
    int			nl;
#if PSZ == 24
    char *psrcb, *pdstb;
    int	xIndex;
#else
    int			dstBit;		/* offset in bits from beginning of
					 * word */
    int	nstart; 	/* number of bits from first partial */
#if PSZ != 32 || PPW != 1
    int	nend; 		/* " " last partial word */
#endif
    int			startmask, endmask, nlMiddle;
#endif
    DeclareMergeRop()

    InitializeMergeRop(alu,planemask);
#if PSZ == 24
    pdst = pdstBase + (y * widthDst);
    xIndex = xStart;
    pdstb = (char *)pdst + (xStart * PSZB);
    offSrc = xStart - xOrigin;
    psrcb = (char *)psrc + (offSrc * PSZB);
#else
    pdst = pdstBase + (y * widthDst) + (xStart >> PWSH); 
    psrc += (xStart - xOrigin) >> PWSH;
    offSrc = (xStart - xOrigin) & PIM;
#endif
    w = xEnd - xStart;

#if PSZ == 24
    nl = w;
    while (nl--){
      psrc = (unsigned int *)((unsigned long)psrcb & ~(PGSZB - 1));
      getbits24(psrc, tmpSrc, offSrc);
      pdst = (int *)((unsigned long)pdstb & ~(PGSZB - 1));
      DoMergeRop24(tmpSrc, pdst, xIndex);
      offSrc++;
      psrcb += PSZB;
      xIndex++;
      pdstb += PSZB;
    } 
#else /* PSZ == 24 */
    dstBit = xStart & PIM;
    if (dstBit + w <= PPW) 
    { 
	maskpartialbits(dstBit, w, startmask);
	endmask = 0;
	nlMiddle = 0;
    } 
    else 
    { 
	maskbits(xStart, w, startmask, endmask, nlMiddle);
    }
    if (startmask) 
	nstart = PPW - dstBit; 
    else 
	nstart = 0; 
#if PSZ != 32 || PPW != 1
    if (endmask) 
	nend = xEnd & PIM; 
    else 
	nend = 0; 
#endif
    if (startmask) 
    { 
	getbits(psrc, offSrc, nstart, tmpSrc);
	putbitsmropshort(tmpSrc, dstBit, nstart, pdst);
	pdst++; 
	offSrc += nstart;
	if (offSrc > PLST)
	{
	    psrc++;
	    offSrc -= PPW;
	}
    } 
    nl = nlMiddle; 
    while (nl--) 
    { 
	getbits(psrc, offSrc, PPW, tmpSrc);
	*pdst = DoMergeRop(tmpSrc, *pdst);
	pdst++; 
	psrc++; 
    } 
    if (endmask) 
    { 
	getbits(psrc, offSrc, nend, tmpSrc);
	putbitsmropshort(tmpSrc, 0, nend, pdst);
    } 
#endif /* PSZ == 24 */
}



/* SetSpans -- for each span copy pwidth[i] bits from psrc to pDrawable at
 * ppt[i] using the raster op from the GC.  If fSorted is TRUE, the scanlines
 * are in increasing Y order.
 * Source bit lines are server scanline padded so that they always begin
 * on a word boundary.
 */ 
void
cfbSetSpans(DrawablePtr pDrawable, GCPtr pGC, char *pcharsrc, DDXPointPtr ppt,
	    int *pwidth, int nspans, int fSorted)
{
    unsigned int	*psrc = (unsigned int *)pcharsrc;
    CfbBits	*pdstBase;	/* start of dst bitmap */
    int 		widthDst;	/* width of bitmap in words */
    BoxPtr 	pbox, pboxLast, pboxTest;
    DDXPointPtr pptLast;
    int 		alu;
    RegionPtr 		prgnDst;
    int			xStart, xEnd;
    int			yMax;

    alu = pGC->alu;
    prgnDst = cfbGetCompositeClip(pGC);
    pptLast = ppt + nspans;

    cfbGetLongWidthAndPointer (pDrawable, widthDst, pdstBase)

    yMax = (int) pDrawable->y + (int) pDrawable->height;

    pbox = REGION_RECTS(prgnDst);
    pboxLast = pbox + REGION_NUM_RECTS(prgnDst);

    if(fSorted)
    {
    /* scan lines sorted in ascending order. Because they are sorted, we
     * don't have to check each scanline against each clip box.  We can be
     * sure that this scanline only has to be clipped to boxes at or after the
     * beginning of this y-band 
     */
	pboxTest = pbox;
	while(ppt < pptLast)
	{
	    pbox = pboxTest;
	    if(ppt->y >= yMax)
		break;
	    while(pbox < pboxLast)
	    {
		if(pbox->y1 > ppt->y)
		{
		    /* scanline is before clip box */
		    break;
		}
		else if(pbox->y2 <= ppt->y)
		{
		    /* clip box is before scanline */
		    pboxTest = ++pbox;
		    continue;
		}
		else if(pbox->x1 > ppt->x + *pwidth) 
		{
		    /* clip box is to right of scanline */
		    break;
		}
		else if(pbox->x2 <= ppt->x)
		{
		    /* scanline is to right of clip box */
		    pbox++;
		    continue;
		}

		/* at least some of the scanline is in the current clip box */
		xStart = max(pbox->x1, ppt->x);
		xEnd = min(ppt->x + *pwidth, pbox->x2);
		cfbSetScanline(ppt->y, ppt->x, xStart, xEnd, psrc, alu,
		    (int *)pdstBase, widthDst, pGC->planemask);
		if(ppt->x + *pwidth <= pbox->x2)
		{
		    /* End of the line, as it were */
		    break;
		}
		else
		    pbox++;
	    }
	    /* We've tried this line against every box; it must be outside them
	     * all.  move on to the next point */
	    ppt++;
	    psrc += PixmapWidthInPadUnits(*pwidth, pDrawable->depth);
	    pwidth++;
	}
    }
    else
    {
    /* scan lines not sorted. We must clip each line against all the boxes */
	while(ppt < pptLast)
	{
	    if(ppt->y >= 0 && ppt->y < yMax)
	    {
		
		for(pbox = REGION_RECTS(prgnDst); pbox< pboxLast; pbox++)
		{
		    if(pbox->y1 > ppt->y)
		    {
			/* rest of clip region is above this scanline,
			 * skip it */
			break;
		    }
		    if(pbox->y2 <= ppt->y)
		    {
			/* clip box is below scanline */
			pbox++;
			break;
		    }
		    if(pbox->x1 <= ppt->x + *pwidth &&
		       pbox->x2 > ppt->x)
		    {
			xStart = max(pbox->x1, ppt->x);
			xEnd = min(pbox->x2, ppt->x + *pwidth);
			cfbSetScanline(ppt->y, ppt->x, xStart, xEnd, psrc, alu,
			    (int *)pdstBase, widthDst, pGC->planemask);
		    }

		}
	    }
	psrc += PixmapWidthInPadUnits(*pwidth, pDrawable->depth);
	ppt++;
	pwidth++;
	}
    }
}