/* $Xorg: cfbglblt8.c,v 1.4 2001/02/09 02:04:38 xorgcvs Exp $ */
/*

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.
*/
/* $XFree86: xc/programs/Xserver/cfb/cfbglblt8.c,v 3.6 2001/12/14 19:59:23 dawes Exp $ */

/*
 * 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 CfbBits 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__)) && PSZ == 8 && !defined(USE_LEFTBITS)
#ifdef USE_STIPPLE_CODE
#undef USE_STIPPLE_CODE
#endif
#include "stip68kgnu.h"
#endif

#if PSZ == 24
#define DST_INC	    3
#else
#define DST_INC	    (PGSZB >> PWSH)
#endif

/*  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 */
{
#ifndef GLYPHROP
    register CfbBits  pixel;
#endif
#if !defined(STIPPLE) && !defined(USE_STIPPLE_CODE)
    register CfbBits  c;
    register CfbBits  *dst;
#endif
    register glyphPointer   glyphBits;
    register int	    xoff;

    FontPtr		pfont = pGC->font;
    CharInfoPtr		pci;
    CfbBits	*dstLine;
    CfbBits	*pdstBase;
    int			hTmp;
    int			bwidthDst;
    int			widthDst;
    int			h;
    BoxRec		bbox;		/* for clipping */
    int			w;
    RegionPtr		clip;
    BoxPtr		extents;
#ifdef USE_LEFTBITS
    int			widthGlyph;
    CfbBits	widthMask;
#endif
#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
    cfb8CheckStipple (pGC->alu, pGC->fgPixel, pGC->planemask);
#else
    pixel = cfbGetGCPrivate(pGC)->xor;
#endif

    cfbGetTypedWidthAndPointer (pDrawable, bwidthDst, pdstBase, char, CfbBits)

    widthDst = bwidthDst / PGSZB;
    while (nglyph--)
    {
	pci = *ppci++;
	glyphBits = (glyphPointer) FONTGLYPHBITS(pglyphBase,pci);
	xoff = x + pci->metrics.leftSideBearing;
#if PSZ == 24
	dstLine = pdstBase + (y - pci->metrics.ascent) * widthDst +((xoff>> 2)*3);
#else
	dstLine = pdstBase +
	          (y - pci->metrics.ascent) * widthDst + (xoff >> PWSH);
#endif
	x += pci->metrics.characterWidth;
	if ((hTmp = pci->metrics.descent + pci->metrics.ascent))
	{
#if PSZ == 24
	    xoff &= 0x03;
#else
	    xoff &= PIM;
#endif /* PSZ == 24 */
#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 = (CfbBits *) (((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 */
{
#ifndef GLYPHROP
    register CfbBits	pixel;
#endif
#if !defined(STIPPLE) && !defined(USE_STIPPLE_CODE)
    register CfbBits	c;
#endif
    register glyphPointer   glyphBits;
    register int	xoff;
#if defined(USE_LEFT_BITS) || (!defined(STIPPLE) && !defined(USE_STIPPLE_CODE))
    register CfbBits	*dst;
#endif

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

#ifdef GLYPHROP
    cfb8CheckStipple (pGC->alu, pGC->fgPixel, pGC->planemask);
#else
    pixel = cfbGetGCPrivate(pGC)->xor;
#endif
    
    cfbGetTypedWidthAndPointer (pDrawable, bwidthDst, pdstBase, char, CfbBits)

    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))
	{
#if PSZ == 24
	    dstLine = pdstBase + yG * widthDst + ((xG>> 2)*3);
	    /* never use (xG*3)>>2 */
#else
	    dstLine = pdstBase + yG * widthDst + (xG >> PWSH);
#endif
#if PSZ == 24
	    xoff = xG & 3;
#else
	    xoff = xG & PIM;
#endif
#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 = (CfbBits *) (((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 = (CfbBits *) (((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 */
