/* $XConsortium: cfbglblt8.c,v 1.6 94/04/17 21:16:23 rob Exp $ */
/*

Copyright (c) 1989  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 1992, 1993 Data General Corporation;
Copyright 1992, 1993 OMRON Corporation  

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, and that
neither the name OMRON or DATA GENERAL be used in advertising or publicity
pertaining to distribution of the software without specific, written prior
permission of the party whose name is to be used.  Neither OMRON or 
DATA GENERAL make any representation about the suitability of this software
for any purpose.  It is provided "as is" without express or implied warranty.  

OMRON AND DATA GENERAL EACH DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
IN NO EVENT SHALL OMRON OR DATA GENERAL 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.

*/

/*
 * Poly glyph blt.  Accepts an arbitrary font <= 32 bits wide, in Copy mode
 * only.
 */

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

#define BOX_OVERLAP(box1, box2, xoffset, yoffset) \
 	((box1)->x1 <= ((int) (box2)->x2 + (xoffset)) && \
 	 ((int) (box2)->x1 + (xoffset)) <= (box1)->x2 && \
	 (box1)->y1 <= ((int) (box2)->y2 + (yoffset)) && \
 	 ((int) (box2)->y1 + (yoffset)) <= (box1)->y2)

#define BOX_CONTAINS(box1, box2, xoffset, yoffset) \
 	((box1)->x1 <= ((int) (box2)->x1 + (xoffset)) && \
 	 ((int) (box2)->x2 + (xoffset)) <= (box1)->x2 && \
	 (box1)->y1 <= ((int) (box2)->y1 + (yoffset)) && \
 	 ((int) (box2)->y2 + (yoffset)) <= (box1)->y2)

#if defined(FOUR_BIT_CODE) || defined(WriteBitGroup) && !defined(GLYPHROP)

#if GLYPHPADBYTES != 4
#define USE_LEFTBITS
#endif

#ifdef USE_LEFTBITS
typedef	unsigned char	*glyphPointer;
extern unsigned long endtab[];

#define GlyphBits(bits,width,dst)	getleftbits(bits,width,dst); \
					(dst) &= widthMask; \
					(bits) += widthGlyph;
#define GlyphBitsS(bits,width,dst,off)	GlyphBits(bits,width,dst); \
					dst = BitRight (dst, off);
#else
typedef CARD32	*glyphPointer;

#define GlyphBits(bits,width,dst)	dst = *bits++;
#define GlyphBitsS(bits,width,dst,off)	dst = BitRight(*bits++, off);
#endif

#ifdef GLYPHROP
#define cfbPolyGlyphBlt8	cfbPolyGlyphRop8
#define cfbPolyGlyphBlt8Clipped	cfbPolyGlyphRop8Clipped

#undef WriteBitGroup
#define WriteBitGroup(dst,pixel,bits)	RRopBitGroup(dst,bits)

#endif

static void cfbPolyGlyphBlt8Clipped();

#if defined(HAS_STIPPLE_CODE) && !defined(GLYPHROP) && !defined(USE_LEFTBITS)
#define USE_STIPPLE_CODE
#endif

#if defined(__GNUC__) && !defined(GLYPHROP) && (defined(mc68020) || defined(mc68000) || defined(__mc68000__)) && !defined(USE_LEFTBITS)
#ifdef USE_STIPPLE_CODE
#undef USE_STIPPLE_CODE
#endif
#endif

#define DST_INC	    (PGSZB >> PWSH)

/*  cfbStippleStack/cfbStippleStackTE are coded in assembly language.
 *  They are only provided on some architecures.
 */
#ifdef USE_STIPPLE_CODE
extern void		cfbStippleStack (), cfbStippleStackTE ();
#endif

void
cfbPolyGlyphBlt8 (pDrawable, pGC, x, y, nglyph, ppci, pglyphBase)
    DrawablePtr pDrawable;
    GCPtr	pGC;
    int 	x, y;
    unsigned int nglyph;
    CharInfoPtr *ppci;		/* array of character info */
    pointer	pglyphBase;	/* start of array of glyphs */
{
    register unsigned long  c;
#ifndef GLYPHROP
    register unsigned long  pixel;
#endif
    register unsigned long  *dst;
    register glyphPointer   glyphBits;
    register int	    xoff;

    FontPtr		pfont = pGC->font;
    CharInfoPtr		pci;
    unsigned long	*dstLine;
    unsigned long	*pdstBase;
    int			hTmp;
    int			bwidthDst;
    int			widthDst;
    int			h;
    int			ew;
    BoxRec		bbox;		/* for clipping */
    int			widthDiff;
    int			w;
    RegionPtr		clip;
    BoxPtr		extents;
#ifdef USE_LEFTBITS
    int			widthGlyph;
    unsigned long	widthMask;
#endif
#ifdef XTHREADS
#ifdef GLYPHROP
    StippleRec          *pstipple;
#endif
#endif /* XTHREADS */
#ifndef STIPPLE
#ifdef USE_STIPPLE_CODE
    void		(*stipple)();

    stipple = cfbStippleStack;
    if (FONTCONSTMETRICS(pfont))
	stipple = cfbStippleStackTE;
#endif
#endif
    
    x += pDrawable->x;
    y += pDrawable->y;

    /* compute an approximate (but covering) bounding box */
    bbox.x1 = 0;
    if ((ppci[0]->metrics.leftSideBearing < 0))
	bbox.x1 = ppci[0]->metrics.leftSideBearing;
    h = nglyph - 1;
    w = ppci[h]->metrics.rightSideBearing;
    while (--h >= 0)
	w += ppci[h]->metrics.characterWidth;
    bbox.x2 = w;
    bbox.y1 = -FONTMAXBOUNDS(pfont,ascent);
    bbox.y2 = FONTMAXBOUNDS(pfont,descent);

    clip = cfbGetCompositeClip(pGC);
    extents = &clip->extents;

    if (!clip->data) 
    {
	if (!BOX_CONTAINS(extents, &bbox, x, y))
	{
	    if (BOX_OVERLAP (extents, &bbox, x, y))
		cfbPolyGlyphBlt8Clipped(pDrawable, pGC, x, y,
					nglyph, ppci, pglyphBase);
	    return;
	}
    }
    else
    {
    	/* check to make sure some of the text appears on the screen */
    	if (!BOX_OVERLAP (extents, &bbox, x, y))
	    return;
    
    	bbox.x1 += x;
    	bbox.x2 += x;
    	bbox.y1 += y;
    	bbox.y2 += y;
    
    	switch (RECT_IN_REGION(pGC->pScreen, clip, &bbox))
    	{
      	  case rgnPART:
	    cfbPolyGlyphBlt8Clipped(pDrawable, pGC, x, y,
				    nglyph, ppci, pglyphBase);
      	  case rgnOUT:
	    return;
    	}
    }

#ifdef GLYPHROP
#ifdef XTHREADS
    if(!(pstipple = (cfbGetGCPrivate(pGC))->stipple))
    {
	pstipple = (StippleRec *)xalloc( sizeof( StippleRec ) );
	(cfbGetGCPrivate(pGC))->stipple = pstipple;
	cfb8SetStipple (pGC->alu, pGC->fgPixel, pGC->planemask, pstipple);
    }
    else
#endif /* XTHREADS */
#ifdef XTHREADS
	cfb8SetStipple (pGC->alu, pGC->fgPixel, pGC->planemask, pstipple);
#else
	cfb8CheckStipple (pGC->alu, pGC->fgPixel, pGC->planemask);
#endif /* !XTHREADS */
#ifdef XTHREADS
    pstipple->change = FALSE; /* XXX */
#endif /* XTHREADS */
#else
    pixel = cfbGetGCPrivate(pGC)->xor;
#endif

    cfbGetTypedWidthAndPointer (pDrawable, bwidthDst, pdstBase, char, unsigned long)

    widthDst = bwidthDst / PGSZB;
    while (nglyph--)
    {
	pci = *ppci++;
	glyphBits = (glyphPointer) FONTGLYPHBITS(pglyphBase,pci);
	xoff = x + pci->metrics.leftSideBearing;
	dstLine = pdstBase +
	          (y - pci->metrics.ascent) * widthDst + (xoff >> PWSH);
	x += pci->metrics.characterWidth;
	if (hTmp = pci->metrics.descent + pci->metrics.ascent)
	{
	    xoff &= PIM;
#ifdef STIPPLE
	    STIPPLE(dstLine,glyphBits,pixel,bwidthDst,hTmp,xoff);
#else
#ifdef USE_STIPPLE_CODE
	    (*stipple)(dstLine,glyphBits,pixel,bwidthDst,hTmp,xoff);
#else
#ifdef USE_LEFTBITS
	    w = pci->metrics.rightSideBearing - pci->metrics.leftSideBearing;
	    widthGlyph = PADGLYPHWIDTHBYTES(w);
	    widthMask = endtab[w];
#endif
	    do {
	    	dst = dstLine;
	    	dstLine = (unsigned long *) (((char *) dstLine) + bwidthDst);
	    	GlyphBits(glyphBits, w, c)
	    	WriteBitGroup(dst, pixel, GetBitGroup(BitRight(c,xoff)));
	    	dst += DST_INC;
	    	c = BitLeft(c,PGSZB - xoff);
	    	while (c)
	    	{
		    WriteBitGroup(dst, pixel, GetBitGroup(c));
		    NextBitGroup(c);
		    dst += DST_INC;
	    	}
	    } while (--hTmp);
#endif /* USE_STIPPLE_CODE else */
#endif /* STIPPLE else */
	}
    }
}

static void
cfbPolyGlyphBlt8Clipped (pDrawable, pGC, x, y, nglyph, ppci, pglyphBase)
    DrawablePtr pDrawable;
    GCPtr	pGC;
    int 	x, y;
    unsigned int nglyph;
    CharInfoPtr *ppci;		/* array of character info */
    unsigned char *pglyphBase;	/* start of array of glyphs */
{
    register unsigned long  c;
#ifndef GLYPHROP
    register unsigned long  pixel;
#endif
    register unsigned long  *dst;
    register glyphPointer   glyphBits;
    register int	    xoff;
    unsigned long	    c1;

    CharInfoPtr		pci;
    FontPtr		pfont = pGC->font;
    unsigned long	*dstLine;
    unsigned long	*pdstBase;
    CARD32		*cTmp, *clips;
    int			maxAscent, maxDescent;
    int			minLeftBearing;
    int			hTmp;
    int			widthDst;
    int			bwidthDst;
    int			ew;
    int			xG, yG;
    BoxPtr		pBox;
    int			numRects;
    int			widthDiff;
    int			w;
    RegionPtr		pRegion;
    int			yBand;
#ifdef GLYPHROP
    unsigned long       bits;
#ifdef XTHREADS
    StippleRec		*pstipple;
#endif /* XTHREADS */
#endif
#ifdef USE_LEFTBITS
    int			widthGlyph;
    unsigned long	widthMask;
#endif

#ifdef GLYPHROP
#ifdef XTHREADS
    if(!(pstipple = (cfbGetGCPrivate(pGC))->stipple))
    {
	pstipple = (StippleRec *)xalloc( sizeof( StippleRec ) );
	(cfbGetGCPrivate(pGC))->stipple = pstipple;
	cfb8SetStipple (pGC->alu, pGC->fgPixel, pGC->planemask, pstipple);
    }
    else
#endif /* XTHREADS */
#ifdef XTHREADS
	cfb8SetStipple (pGC->alu, pGC->fgPixel, pGC->planemask, pstipple);
#else
	cfb8CheckStipple (pGC->alu, pGC->fgPixel, pGC->planemask);
#endif /* !XTHREADS */
#ifdef XTHREADS
    pstipple->change = FALSE; /* XXX */
#endif /* XTHREADS */
#else
    pixel = cfbGetGCPrivate(pGC)->xor;
#endif
    
    cfbGetTypedWidthAndPointer (pDrawable, bwidthDst, pdstBase, char, unsigned long)

    widthDst = bwidthDst / PGSZB;
    maxAscent = FONTMAXBOUNDS(pfont,ascent);
    maxDescent = FONTMAXBOUNDS(pfont,descent);
    minLeftBearing = FONTMINBOUNDS(pfont,leftSideBearing);

    pRegion = cfbGetCompositeClip(pGC);

    pBox = REGION_RECTS(pRegion);
    numRects = REGION_NUM_RECTS (pRegion);
    while (numRects && pBox->y2 <= y - maxAscent)
    {
	++pBox;
	--numRects;
    }
    if (!numRects || pBox->y1 >= y + maxDescent)
	return;
    yBand = pBox->y1;
    while (numRects && pBox->y1 == yBand && pBox->x2 <= x + minLeftBearing)
    {
	++pBox;
	--numRects;
    }
    if (!numRects)
	return;
    clips = (CARD32 *)ALLOCATE_LOCAL ((maxAscent + maxDescent) *
						sizeof (CARD32));
    while (nglyph--)
    {
	pci = *ppci++;
	glyphBits = (glyphPointer) FONTGLYPHBITS(pglyphBase,pci);
	w = pci->metrics.rightSideBearing - pci->metrics.leftSideBearing;
	xG = x + pci->metrics.leftSideBearing;
	yG = y - pci->metrics.ascent;
	x += pci->metrics.characterWidth;
	if (hTmp = pci->metrics.descent + pci->metrics.ascent)
	{
	    dstLine = pdstBase + yG * widthDst + (xG >> PWSH);
	    xoff = xG & PIM;
#ifdef USE_LEFTBITS
	    w = pci->metrics.rightSideBearing - pci->metrics.leftSideBearing;
	    widthGlyph = PADGLYPHWIDTHBYTES(w);
	    widthMask = endtab[w];
#endif
	    switch (cfb8ComputeClipMasks32 (pBox, numRects, xG, yG, w, hTmp, clips))
 	    {
	    case rgnPART:
#ifdef USE_LEFTBITS
	    	cTmp = clips;
	    	do {
	    	    dst = dstLine;
	    	    dstLine = (unsigned long *) (((char *) dstLine) + bwidthDst);
	    	    GlyphBits(glyphBits, w, c)
		    c &= *cTmp++;
		    if (c)
		    {
	    	    	WriteBitGroup(dst, pixel, GetBitGroup(BitRight(c,xoff)));
	    	    	c = BitLeft(c,PGSZB - xoff); 
	    	    	dst += DST_INC;
	    	    	while (c)
	    	    	{
		    	    WriteBitGroup(dst, pixel, GetBitGroup(c));
		    	    NextBitGroup(c);
		    	    dst += DST_INC;
	    	    	}
		    }
	    	} while (--hTmp);
	    	break;
#else /* !USE_LEFT_BITS */
	    	{
		    int h;
    
		    h = hTmp;
		    do
		    {
			--h;
		    	clips[h] = clips[h] & glyphBits[h];
		    } while (h);
	    	}
	    	glyphBits = clips;
	    	/* fall through */
#endif /* USE_LEFT_BITS */
	    case rgnIN:
#ifdef STIPPLE
	    	STIPPLE(dstLine,glyphBits,pixel,bwidthDst,hTmp,xoff);
#else
#ifdef USE_STIPPLE_CODE
	    	cfbStippleStackTE(dstLine,glyphBits,pixel,bwidthDst,hTmp,xoff);
#else
	    	do {
	    	    dst = dstLine;
	    	    dstLine = (unsigned long *) (((char *) dstLine) + bwidthDst);
	    	    GlyphBits(glyphBits, w, c)
		    if (c)
		    {
		        /* This code originally could read memory locations
			 * that were not mapped. Hence we have to check the
			 * trailing bits to see whether they are zero and if
			 * then skip them correctly. This is no problem for
			 * the GXcopy case, since there only the pixels that
			 * are non-zero are written ...
			 */
#ifndef GLYPHROP
	    	    	WriteBitGroup(dst, pixel, GetBitGroup(BitRight(c,xoff)));
	    	    	c = BitLeft(c,PGSZB - xoff);
	    	    	dst += DST_INC;
#else /* GLYPHROP */
                        if (bits = GetBitGroup(BitRight(c,xoff)))
	    	    	  WriteBitGroup(dst, pixel, bits);
	    	    	c = BitLeft(c,PGSZB - xoff);
	    	    	dst += DST_INC;

			while (c && ((bits = GetBitGroup(c)) == 0))
		        {
		    	    NextBitGroup(c);
		    	    dst += DST_INC;
                        } 
#endif /* GLYPHROP */
	    	    	while (c)
	    	    	{
		    	    WriteBitGroup(dst, pixel, GetBitGroup(c));
		    	    NextBitGroup(c);
		    	    dst += DST_INC;
	    	    	}
		    }
	    	} while (--hTmp);
#endif /* USE_STIPPLE_CODE else */
#endif /* STIPPLE else */
	    	break;
	    }
	}
    }
    DEALLOCATE_LOCAL (clips);
}

#endif /* FOUR_BIT_CODE */