/*
 * cfb copy area
 */

/*

Copyright 1989, 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.

Author: Keith Packard

*/
/* $Xorg: cfbblt.c,v 1.4 2001/02/09 02:04:37 xorgcvs Exp $ */

#include	"X.h"
#include	"Xmd.h"
#include	"Xproto.h"
#include	"gcstruct.h"
#include	"windowstr.h"
#include	"scrnintstr.h"
#include	"pixmapstr.h"
#include	"regionstr.h"
#include	"cfb.h"
#include	"cfbmskbits.h"
#include	"cfb8bit.h"
#include	"fastblt.h"
#include	"mergerop.h"

#ifdef notdef /* XXX fails right now, walks off end of pixmaps */
#if defined (FAST_UNALIGNED_READS) && PSZ == 8
#define DO_UNALIGNED_BITBLT
#endif
#endif

#if defined(FAST_MEMCPY) && (MROP == Mcopy) && PSZ == 8
#define DO_MEMCPY
#endif

void
MROP_NAME(cfbDoBitblt)(pSrc, pDst, alu, prgnDst, pptSrc, planemask)
    DrawablePtr	    pSrc, pDst;
    int		    alu;
    RegionPtr	    prgnDst;
    DDXPointPtr	    pptSrc;
    unsigned long   planemask;
{
    unsigned long *psrcBase, *pdstBase;	
				/* start of src and dst bitmaps */
    int widthSrc, widthDst;	/* add to get to same position in next line */

    BoxPtr pbox;
    int nbox;

    BoxPtr pboxTmp, pboxNext, pboxBase, pboxNew1, pboxNew2;
				/* temporaries for shuffling rectangles */
    DDXPointPtr pptTmp, pptNew1, pptNew2;
				/* shuffling boxes entails shuffling the
				   source points too */
    int w, h;
    int xdir;			/* 1 = left right, -1 = right left/ */
    int ydir;			/* 1 = top down, -1 = bottom up */

    unsigned long *psrcLine, *pdstLine;	
				/* pointers to line with current src and dst */
    register unsigned long *psrc;/* pointer to current src longword */
    register unsigned long *pdst;/* pointer to current dst longword */

    MROP_DECLARE_REG()

				/* following used for looping through a line */
    unsigned long startmask, endmask;	/* masks for writing ends of dst */
    int nlMiddle;		/* whole longwords in dst */
    int xoffSrc, xoffDst;
    register int leftShift, rightShift;
    register unsigned long bits;
    register unsigned long bits1;
    register int nl;		/* temp copy of nlMiddle */

				/* place to store full source word */
    int nstart;			/* number of ragged bits at start of dst */
    int nend;			/* number of ragged bits at end of dst */
    int srcStartOver;		/* pulling nstart bits from src
				   overflows into the next word? */
    int careful;
    int tmpSrc;

    MROP_INITIALIZE(alu,planemask);

    cfbGetLongWidthAndPointer (pSrc, widthSrc, psrcBase)

    cfbGetLongWidthAndPointer (pDst, widthDst, pdstBase)

    /* XXX we have to err on the side of safety when both are windows,
     * because we don't know if IncludeInferiors is being used.
     */
    careful = ((pSrc == pDst) ||
	       ((pSrc->type == DRAWABLE_WINDOW) &&
		(pDst->type == DRAWABLE_WINDOW)));

    pbox = REGION_RECTS(prgnDst);
    nbox = REGION_NUM_RECTS(prgnDst);

    pboxNew1 = NULL;
    pptNew1 = NULL;
    pboxNew2 = NULL;
    pptNew2 = NULL;
    if (careful && (pptSrc->y < pbox->y1))
    {
        /* walk source botttom to top */
	ydir = -1;
	widthSrc = -widthSrc;
	widthDst = -widthDst;

	if (nbox > 1)
	{
	    /* keep ordering in each band, reverse order of bands */
	    pboxNew1 = (BoxPtr)ALLOCATE_LOCAL(sizeof(BoxRec) * nbox);
	    if(!pboxNew1)
		return;
	    pptNew1 = (DDXPointPtr)ALLOCATE_LOCAL(sizeof(DDXPointRec) * nbox);
	    if(!pptNew1)
	    {
	        DEALLOCATE_LOCAL(pboxNew1);
	        return;
	    }
	    pboxBase = pboxNext = pbox+nbox-1;
	    while (pboxBase >= pbox)
	    {
	        while ((pboxNext >= pbox) &&
		       (pboxBase->y1 == pboxNext->y1))
		    pboxNext--;
	        pboxTmp = pboxNext+1;
	        pptTmp = pptSrc + (pboxTmp - pbox);
	        while (pboxTmp <= pboxBase)
	        {
		    *pboxNew1++ = *pboxTmp++;
		    *pptNew1++ = *pptTmp++;
	        }
	        pboxBase = pboxNext;
	    }
	    pboxNew1 -= nbox;
	    pbox = pboxNew1;
	    pptNew1 -= nbox;
	    pptSrc = pptNew1;
        }
    }
    else
    {
	/* walk source top to bottom */
	ydir = 1;
    }

    if (careful && (pptSrc->x < pbox->x1))
    {
	/* walk source right to left */
        xdir = -1;

	if (nbox > 1)
	{
	    /* reverse order of rects in each band */
	    pboxNew2 = (BoxPtr)ALLOCATE_LOCAL(sizeof(BoxRec) * nbox);
	    pptNew2 = (DDXPointPtr)ALLOCATE_LOCAL(sizeof(DDXPointRec) * nbox);
	    if(!pboxNew2 || !pptNew2)
	    {
		if (pptNew2) DEALLOCATE_LOCAL(pptNew2);
		if (pboxNew2) DEALLOCATE_LOCAL(pboxNew2);
		if (pboxNew1)
		{
		    DEALLOCATE_LOCAL(pptNew1);
		    DEALLOCATE_LOCAL(pboxNew1);
		}
	        return;
	    }
	    pboxBase = pboxNext = pbox;
	    while (pboxBase < pbox+nbox)
	    {
	        while ((pboxNext < pbox+nbox) &&
		       (pboxNext->y1 == pboxBase->y1))
		    pboxNext++;
	        pboxTmp = pboxNext;
	        pptTmp = pptSrc + (pboxTmp - pbox);
	        while (pboxTmp != pboxBase)
	        {
		    *pboxNew2++ = *--pboxTmp;
		    *pptNew2++ = *--pptTmp;
	        }
	        pboxBase = pboxNext;
	    }
	    pboxNew2 -= nbox;
	    pbox = pboxNew2;
	    pptNew2 -= nbox;
	    pptSrc = pptNew2;
	}
    }
    else
    {
	/* walk source left to right */
        xdir = 1;
    }

    while(nbox--)
    {
	w = pbox->x2 - pbox->x1;
	h = pbox->y2 - pbox->y1;

	if (ydir == -1) /* start at last scanline of rectangle */
	{
	    psrcLine = psrcBase + ((pptSrc->y+h-1) * -widthSrc);
	    pdstLine = pdstBase + ((pbox->y2-1) * -widthDst);
	}
	else /* start at first scanline */
	{
	    psrcLine = psrcBase + (pptSrc->y * widthSrc);
	    pdstLine = pdstBase + (pbox->y1 * widthDst);
	}
	if ((pbox->x1 & PIM) + w <= PPW)
	{
	    maskpartialbits (pbox->x1, w, endmask);
	    startmask = 0;
	    nlMiddle = 0;
	}
	else
	{
	    maskbits(pbox->x1, w, startmask, endmask, nlMiddle);
	}

#ifdef DO_MEMCPY
	/* If the src and dst scanline don't overlap, do forward case.  */

	if ((xdir == 1) || (pptSrc->y != pbox->y1)
		|| (pptSrc->x + w <= pbox->x1))
	{
	    char *psrc = (char *) psrcLine + pptSrc->x;
	    char *pdst = (char *) pdstLine + pbox->x1;
	    while (h--)
	    {
	    	memcpy(pdst, psrc, w);
		pdst += widthDst << 2;
		psrc += widthSrc << 2;
	    }
	}
#else /* ! DO_MEMCPY */
	if (xdir == 1)
	{
	    xoffSrc = pptSrc->x & PIM;
	    xoffDst = pbox->x1 & PIM;
	    pdstLine += (pbox->x1 >> PWSH);
	    psrcLine += (pptSrc->x >> PWSH);
#ifdef DO_UNALIGNED_BITBLT
	    nl = xoffSrc - xoffDst;
	    psrcLine = (unsigned long *)
			(((unsigned char *) psrcLine) + nl);
#else
	    if (xoffSrc == xoffDst)
#endif
	    {
		while (h--)
		{
		    psrc = psrcLine;
		    pdst = pdstLine;
		    pdstLine += widthDst;
		    psrcLine += widthSrc;
		    if (startmask)
		    {
			*pdst = MROP_MASK(*psrc, *pdst, startmask);
			psrc++;
			pdst++;
		    }
		    nl = nlMiddle;

#ifdef LARGE_INSTRUCTION_CACHE
#ifdef FAST_CONSTANT_OFFSET_MODE

		    psrc += nl & (UNROLL-1);
		    pdst += nl & (UNROLL-1);

#define BodyOdd(n) pdst[-n] = MROP_SOLID (psrc[-n], pdst[-n]);
#define BodyEven(n) pdst[-n] = MROP_SOLID (psrc[-n], pdst[-n]);

#define LoopReset \
pdst += UNROLL; \
psrc += UNROLL;

#else

#define BodyOdd(n)  *pdst = MROP_SOLID (*psrc, *pdst); pdst++; psrc++;
#define BodyEven(n) BodyOdd(n)

#define LoopReset   ;

#endif
		    PackedLoop

#undef BodyOdd
#undef BodyEven
#undef LoopReset

#else
#ifdef NOTDEF
		    /* you'd think this would be faster --
		     * a single instruction instead of 6
		     * but measurements show it to be ~15% slower
		     */
		    while ((nl -= 6) >= 0)
		    {
			asm ("moveml %1+,#0x0c0f;moveml#0x0c0f,%0"
			     : "=m" (*(char *)pdst)
			     : "m" (*(char *)psrc)
			     : "d0", "d1", "d2", "d3",
			       "a2", "a3");
			pdst += 6;
		    }
		    nl += 6;
		    while (nl--)
			*pdst++ = *psrc++;
#endif
		    DuffL(nl, label1,
			    *pdst = MROP_SOLID (*psrc, *pdst);
			    pdst++; psrc++;)
#endif

		    if (endmask)
			*pdst = MROP_MASK(*psrc, *pdst, endmask);
		}
	    }
#ifndef DO_UNALIGNED_BITBLT
	    else
	    {
		if (xoffSrc > xoffDst)
		{
#if PGSZ == 32
		    leftShift = (xoffSrc - xoffDst) << (5 - PWSH);
#else /* PGSZ == 64 */
		    leftShift = (xoffSrc - xoffDst) << (6 - PWSH);
#endif /* PGSZ */
		    rightShift = PGSZ - leftShift;
		}
		else
		{
#if PGSZ == 32
		    rightShift = (xoffDst - xoffSrc) << (5 - PWSH);
#else /* PGSZ == 64 */
		    rightShift = (xoffDst - xoffSrc) << (6 - PWSH);
#endif /* PGSZ */
		    leftShift = PGSZ - rightShift;
		}
		while (h--)
		{
		    psrc = psrcLine;
		    pdst = pdstLine;
		    pdstLine += widthDst;
		    psrcLine += widthSrc;
		    bits = 0;
		    if (xoffSrc > xoffDst)
			bits = *psrc++;
		    if (startmask)
		    {
			bits1 = BitLeft(bits,leftShift);
			bits = *psrc++;
			bits1 |= BitRight(bits,rightShift);
			*pdst = MROP_MASK(bits1, *pdst, startmask);
			pdst++;
		    }
		    nl = nlMiddle;

#ifdef LARGE_INSTRUCTION_CACHE
		    bits1 = bits;

#ifdef FAST_CONSTANT_OFFSET_MODE

		    psrc += nl & (UNROLL-1);
		    pdst += nl & (UNROLL-1);

#define BodyOdd(n) \
bits = psrc[-n]; \
pdst[-n] = MROP_SOLID(BitLeft(bits1, leftShift) | BitRight(bits, rightShift), pdst[-n]);

#define BodyEven(n) \
bits1 = psrc[-n]; \
pdst[-n] = MROP_SOLID(BitLeft(bits, leftShift) | BitRight(bits1, rightShift), pdst[-n]);

#define LoopReset \
pdst += UNROLL; \
psrc += UNROLL;

#else

#define BodyOdd(n) \
bits = *psrc++; \
*pdst = MROP_SOLID(BitLeft(bits1, leftShift) | BitRight(bits, rightShift), *pdst); \
pdst++;
		   
#define BodyEven(n) \
bits1 = *psrc++; \
*pdst = MROP_SOLID(BitLeft(bits, leftShift) | BitRight(bits1, rightShift), *pdst); \
pdst++;

#define LoopReset   ;

#endif	/* !FAST_CONSTANT_OFFSET_MODE */

		    PackedLoop

#undef BodyOdd
#undef BodyEven
#undef LoopReset

#else
		    DuffL (nl,label2,
			bits1 = BitLeft(bits, leftShift);
			bits = *psrc++;
			*pdst = MROP_SOLID (bits1 | BitRight(bits, rightShift), *pdst);
			pdst++;
		    )
#endif

		    if (endmask)
		    {
			bits1 = BitLeft(bits, leftShift);
			if (BitLeft(endmask, rightShift))
			{
			    bits = *psrc;
			    bits1 |= BitRight(bits, rightShift);
			}
			*pdst = MROP_MASK (bits1, *pdst, endmask);
		    }
		}
	    }
#endif /* DO_UNALIGNED_BITBLT */
	}
#endif /* ! DO_MEMCPY */
	else	/* xdir == -1 */
	{
	    xoffSrc = (pptSrc->x + w - 1) & PIM;
	    xoffDst = (pbox->x2 - 1) & PIM;
	    pdstLine += ((pbox->x2-1) >> PWSH) + 1;
	    psrcLine += ((pptSrc->x+w - 1) >> PWSH) + 1;
#ifdef DO_UNALIGNED_BITBLT
	    nl = xoffSrc - xoffDst;
	    psrcLine = (unsigned long *)
			(((unsigned char *) psrcLine) + nl);
#else
	    if (xoffSrc == xoffDst)
#endif
	    {
		while (h--)
		{
		    psrc = psrcLine;
		    pdst = pdstLine;
		    pdstLine += widthDst;
		    psrcLine += widthSrc;
		    if (endmask)
		    {
			pdst--;
			psrc--;
			*pdst = MROP_MASK (*psrc, *pdst, endmask);
		    }
		    nl = nlMiddle;

#ifdef LARGE_INSTRUCTION_CACHE
#ifdef FAST_CONSTANT_OFFSET_MODE
		    psrc -= nl & (UNROLL - 1);
		    pdst -= nl & (UNROLL - 1);

#define BodyOdd(n) pdst[n-1] = MROP_SOLID (psrc[n-1], pdst[n-1]);

#define BodyEven(n) BodyOdd(n)

#define LoopReset \
pdst -= UNROLL;\
psrc -= UNROLL;

#else

#define BodyOdd(n)  --pdst; --psrc; *pdst = MROP_SOLID(*psrc, *pdst);
#define BodyEven(n) BodyOdd(n)
#define LoopReset   ;

#endif
		    PackedLoop

#undef BodyOdd
#undef BodyEven
#undef LoopReset

#else
		    DuffL(nl,label3,
			 --pdst; --psrc; *pdst = MROP_SOLID (*psrc, *pdst);)
#endif

		    if (startmask)
		    {
			--pdst;
			--psrc;
			*pdst = MROP_MASK(*psrc, *pdst, startmask);
		    }
		}
	    }
#ifndef DO_UNALIGNED_BITBLT
	    else
	    {
		if (xoffDst > xoffSrc)
		{
#if PGSZ == 32
		    rightShift = (xoffDst - xoffSrc) << (5 - PWSH);
#else /* PGSZ == 64 */
		    rightShift = (xoffDst - xoffSrc) << (6 - PWSH);
#endif /* PGSZ */
		    leftShift = PGSZ - rightShift;
		}
		else
		{
#if PGSZ == 32
		    leftShift = (xoffSrc - xoffDst) << (5 - PWSH);
#else /* PGSZ == 64 */
		    leftShift = (xoffSrc - xoffDst) << (6 - PWSH);
#endif /* PGSZ */
		    rightShift = PGSZ - leftShift;
		}
		while (h--)
		{
		    psrc = psrcLine;
		    pdst = pdstLine;
		    pdstLine += widthDst;
		    psrcLine += widthSrc;
		    bits = 0;
		    if (xoffDst > xoffSrc)
			bits = *--psrc;
		    if (endmask)
		    {
			bits1 = BitRight(bits, rightShift);
			bits = *--psrc;
			bits1 |= BitLeft(bits, leftShift);
			pdst--;
			*pdst = MROP_MASK(bits1, *pdst, endmask);
		    }
		    nl = nlMiddle;

#ifdef LARGE_INSTRUCTION_CACHE
		    bits1 = bits;
#ifdef FAST_CONSTANT_OFFSET_MODE
		    psrc -= nl & (UNROLL - 1);
		    pdst -= nl & (UNROLL - 1);

#define BodyOdd(n) \
bits = psrc[n-1]; \
pdst[n-1] = MROP_SOLID(BitRight(bits1, rightShift) | BitLeft(bits, leftShift),pdst[n-1]);

#define BodyEven(n) \
bits1 = psrc[n-1]; \
pdst[n-1] = MROP_SOLID(BitRight(bits, rightShift) | BitLeft(bits1, leftShift),pdst[n-1]);

#define LoopReset \
pdst -= UNROLL; \
psrc -= UNROLL;

#else

#define BodyOdd(n) \
bits = *--psrc; --pdst; \
*pdst = MROP_SOLID(BitRight(bits1, rightShift) | BitLeft(bits, leftShift),*pdst);

#define BodyEven(n) \
bits1 = *--psrc; --pdst; \
*pdst = MROP_SOLID(BitRight(bits, rightShift) | BitLeft(bits1, leftShift),*pdst);

#define LoopReset   ;

#endif

		    PackedLoop

#undef BodyOdd
#undef BodyEven
#undef LoopReset

#else
		    DuffL (nl, label4,
			bits1 = BitRight(bits, rightShift);
			bits = *--psrc;
			--pdst;
			*pdst = MROP_SOLID(bits1 | BitLeft(bits, leftShift),*pdst);
		    )
#endif

		    if (startmask)
		    {
			bits1 = BitRight(bits, rightShift);
			if (BitRight (startmask, leftShift))
			{
			    bits = *--psrc;
			    bits1 |= BitLeft(bits, leftShift);
			}
			--pdst;
			*pdst = MROP_MASK(bits1, *pdst, startmask);
		    }
		}
	    }
#endif
	}
	pbox++;
	pptSrc++;
    }
    if (pboxNew2)
    {
	DEALLOCATE_LOCAL(pptNew2);
	DEALLOCATE_LOCAL(pboxNew2);
    }
    if (pboxNew1)
    {
	DEALLOCATE_LOCAL(pptNew1);
	DEALLOCATE_LOCAL(pboxNew1);
    }
}