cfbteblt8.c

早期freebsd实现

/*
 * TEGblt - ImageText expanded glyph fonts only.  For
 * 8 bit displays, in Copy mode with no clipping.
 */

/*
Copyright 1989 by the Massachusetts Institute of Technology

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 M.I.T. not be used in
advertising or publicity pertaining to distribution of the software
without specific, written prior permission.  M.I.T. makes no
representations about the suitability of this software for any
purpose.  It is provided "as is" without express or implied warranty.
*/

/* $XConsortium: cfbteblt8.c,v 5.14 91/04/10 11:41:38 keith Exp $ */

#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"

#if (PPW == 4)

/*
 * this code supports up to 5 characters at a time.  The performance
 * differences between 4 and 5 is usually small (~7% on PMAX) and
 * frequently negative (SPARC and Sun3), so this file is compiled
 * only once for now.  If you want to use the other options, you'll
 * need to hack cfbgc.c as well.
 */

#ifndef NGLYPHS
#define NGLYPHS 4
#endif

#if NGLYPHS == 4
#define DO_COMMON
#endif

#ifdef DO_COMMON
#define CFBTEGBLT8 cfbTEGlyphBlt8
#endif

/*
 * On little-endian machines (or where fonts are padded to 32-bit
 * boundaries) we can use some magic to avoid the expense of getleftbits
 */

#if ((BITMAP_BIT_ORDER == LSBFirst && NGLYPHS >= 4) || GLYPHPADBYTES == 4)

#if GLYPHPADBYTES == 1
typedef unsigned char	*glyphPointer;
#define USE_LEFTBITS
#endif

#if GLYPHPADBYTES == 2
typedef unsigned short	*glyphPointer;
#define USE_LEFTBITS
#endif

#if GLYPHPADBYTES == 4
typedef unsigned int	*glyphPointer;
#endif

#define GetBitsL    c = BitLeft (*leftChar++, lshift)

#define GetBits1S   c = BitRight(*char1++, xoff1)
#define GetBits1L   GetBitsL | BitRight(*char1++, xoff1)
#define GetBits1U   c = *char1++
#define GetBits2S   GetBits1S | BitRight(*char2++, xoff2)
#define GetBits2L   GetBits1L | BitRight(*char2++, xoff2)
#define GetBits2U   GetBits1U | BitRight(*char2++, xoff2)
#define GetBits3S   GetBits2S | BitRight(*char3++, xoff3)
#define GetBits3L   GetBits2L | BitRight(*char3++, xoff3)
#define GetBits3U   GetBits2U | BitRight(*char3++, xoff3)
#define GetBits4S   GetBits3S | BitRight(*char4++, xoff4)
#define GetBits4L   GetBits3L | BitRight(*char4++, xoff4)
#define GetBits4U   GetBits3U | BitRight(*char4++, xoff4)
#define GetBits5S   GetBits4S | BitRight(*char5++, xoff5)
#define GetBits5L   GetBits4L | BitRight(*char5++, xoff5)
#define GetBits5U   GetBits4U | BitRight(*char5++, xoff5)

#else

typedef unsigned char	*glyphPointer;

#define USE_LEFTBITS

#define GetBitsL    WGetBitsL
#define GetBits1S   WGetBits1S
#define GetBits1L   WGetBits1L
#define GetBits1U   WGetBits1U

#define GetBits2S   GetBits1S Get1Bits (char2, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff2);
#define GetBits2L   GetBits1L Get1Bits (char2, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff2);
#define GetBits2U   GetBits1U Get1Bits (char2, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff2);

#define GetBits3S   GetBits2S Get1Bits (char3, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff3);
#define GetBits3L   GetBits2L Get1Bits (char3, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff3);
#define GetBits3U   GetBits2U Get1Bits (char3, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff3);

#define GetBits4S   GetBits3S Get1Bits (char4, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff4);
#define GetBits4L   GetBits3L Get1Bits (char4, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff4);
#define GetBits4U   GetBits3U Get1Bits (char4, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff4);

#define GetBits5S   GetBits4S Get1Bits (char5, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff5);
#define GetBits5L   GetBits4L Get1Bits (char5, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff5);
#define GetBits5U   GetBits4U Get1Bits (char5, tmpSrc) \
		    c |= BitRight(tmpSrc, xoff5);

#endif

#ifdef USE_LEFTBITS
extern long endtab[];

#define IncChar(c)  (c = (glyphPointer) (((char *) c) + glyphBytes))

#define Get1Bits(ch,dst)    glyphbits (ch, widthGlyph, glyphMask, dst); \
			    IncChar (ch);

#define glyphbits(bits,width,mask,dst)	getleftbits(bits,width,dst); \
					dst &= mask;

#define WGetBitsL   Get1Bits(leftChar,c); \
		    c = BitLeft (c, lshift);
#define WGetBits1S  Get1Bits (char1, c) \
		    c = BitRight (c, xoff1);
#define WGetBits1L  WGetBitsL Get1Bits (char1, tmpSrc) \
		    c |= BitRight (tmpSrc, xoff1);
#define WGetBits1U  Get1Bits (char1, c)

#else
#define WGetBitsL   GetBitsL
#define WGetBits1S  GetBits1S
#define WGetBits1L  GetBits1L
#define WGetBits1U  GetBits1U
#endif

#if NGLYPHS == 2
# define GetBitsNS GetBits2S
# define GetBitsNL GetBits2L
# define GetBitsNU GetBits2U
# define LastChar char2
#ifndef CFBTEGBLT8
# define CFBTEGBLT8 cfbTEGlyphBlt8x2
#endif
#endif
#if NGLYPHS == 3
# define GetBitsNS GetBits3S
# define GetBitsNL GetBits3L
# define GetBitsNU GetBits3U
# define LastChar char3
#ifndef CFBTEGBLT8
# define CFBTEGBLT8 cfbTEGlyphBlt8x3
#endif
#endif
#if NGLYPHS == 4
# define GetBitsNS GetBits4S
# define GetBitsNL GetBits4L
# define GetBitsNU GetBits4U
# define LastChar char4
#ifndef CFBTEGBLT8
# define CFBTEGBLT8 cfbTEGlyphBlt8x4
#endif
#endif
#if NGLYPHS == 5
# define GetBitsNS GetBits5S
# define GetBitsNL GetBits5L
# define GetBitsNU GetBits5U
# define LastChar char5
#ifndef CFBTEGBLT8
# define CFBTEGBLT8 cfbTEGlyphBlt8x5
#endif
#endif

/* another ugly giant macro */
#define SwitchEm    switch (ew) \
		    { \
		    case 0: \
		    	break; \
		    case 1: \
		    	while (hTmp--) { \
			    GetBits; \
			    StoreBits0 \
			    Loop \
		    	} \
		    	break; \
		    case 2: \
		    	while (hTmp--) { \
			    GetBits; \
			    StoreBits0 FirstStep StoreBits(1) \
			    Loop \
		    	} \
		    	break; \
		    case 3: \
		    	while (hTmp--) { \
			    GetBits; \
			    StoreBits0 FirstStep StoreBits(1) Step StoreBits(2) \
			    Loop \
		    	} \
		    	break; \
		    case 4: \
		    	while (hTmp--) { \
			    GetBits; \
			    StoreBits0 FirstStep StoreBits(1) Step \
			    StoreBits(2) Step StoreBits(3) \
			    Loop \
		    	} \
		    	break; \
		    case 5: \
		    	while (hTmp--) { \
			    GetBits; \
			    StoreBits0 FirstStep StoreBits(1) Step \
			    StoreBits(2) Step StoreBits(3) Step \
			    StoreBits(4) \
			    Loop \
		    	} \
		    	break; \
		    case 6: \
		    	while (hTmp--) { \
			    GetBits; \
			    StoreBits0 FirstStep StoreBits(1) Step \
 			    StoreBits(2) Step StoreBits(3) Step \
			    StoreBits(4) Step StoreBits(5) \
			    Loop \
		    	} \
		    	break; \
		    case 7: \
		    	while (hTmp--) { \
			    GetBits; \
			    StoreBits0 FirstStep StoreBits(1) Step \
			    StoreBits(2) Step StoreBits(3) Step \
			    StoreBits(4) Step StoreBits(5) Step \
			    StoreBits(6) \
			    Loop \
		    	} \
		    	break; \
		    case 8: \
		    	while (hTmp--) { \
			    GetBits; \
			    StoreBits0 FirstStep StoreBits(1) Step \
			    StoreBits(2) Step StoreBits(3) Step \
			    StoreBits(4) Step StoreBits(5) Step \
			    StoreBits(6) Step StoreBits(7) \
			    Loop \
		    	} \
		    	break; \
		    }

#ifdef FAST_CONSTANT_OFFSET_MODE
#define StorePixels(o,p)    dst[o] = p
#define Loop		    dst += widthDst;
#else
#define StorePixels(o,p)    *dst++ = (p)
#define Loop		    dst += widthLeft;
#endif

#define Step		    NextFourBits(c);

#if (BITMAP_BIT_ORDER == MSBFirst)
#define StoreBits(o)	StorePixels(o,GetFourPixels(c));
#define FirstStep	Step
#else
#define StoreBits(o)	StorePixels(o,*((unsigned long *) (((char *) cfb8Pixels) + (c & 0x3c))));
#define FirstStep	c = BitLeft (c, 2);
#endif

extern void cfbImageGlyphBlt8();

void
CFBTEGBLT8 (pDrawable, pGC, xInit, yInit, nglyph, ppci, pglyphBase)
    DrawablePtr pDrawable;
    GC 		*pGC;
    int 	xInit, yInit;
    unsigned int nglyph;
    CharInfoPtr *ppci;		/* array of character info */
    unsigned char *pglyphBase;	/* start of array of glyphs */
{
    register unsigned long  c;
    register unsigned long  *dst;
    register unsigned long  leftMask, rightMask;
    register int	    hTmp;
    register int	    xoff1;
    register int	    xoff2;
#if NGLYPHS >= 3
    register int	    xoff3;
#endif
#if NGLYPHS >= 4
    register int	    xoff4;
#endif
#if NGLYPHS >= 5
    register int	    xoff5;
#endif
    register glyphPointer   char1;
    register glyphPointer   char2;
#if NGLYPHS >= 3
    register glyphPointer   char3;
#endif
#if NGLYPHS >= 4
    register glyphPointer   char4;
#endif
#if NGLYPHS >= 5
    register glyphPointer   char5;
#endif

    FontPtr		pfont = pGC->font;
    unsigned long	*dstLine;
    glyphPointer	oldRightChar;
    unsigned long	*pdstBase;
    glyphPointer	leftChar;
    int			widthDst, widthLeft;
    int			widthGlyph;
    int			h;
    int			ew;
    int			x, y;
    BoxRec		bbox;		/* for clipping */
    int			lshift;
    int			widthGlyphs;
#ifdef USE_LEFTBITS
    register int	    glyphMask;
    register unsigned int   tmpSrc;
    register int	    glyphBytes;
#endif

    widthGlyph = FONTMAXBOUNDS(pfont,characterWidth);
    h = FONTASCENT(pfont) + FONTDESCENT(pfont);
    if (!h)
	return;
    x = xInit + FONTMAXBOUNDS(pfont,leftSideBearing) + pDrawable->x;
    y = yInit - FONTASCENT(pfont) + pDrawable->y;
    bbox.x1 = x;
    bbox.x2 = x + (widthGlyph * nglyph);
    bbox.y1 = y;
    bbox.y2 = y + h;

    switch ((*pGC->pScreen->RectIn)(
                ((cfbPrivGC *)(pGC->devPrivates[cfbGCPrivateIndex].ptr))->pCompositeClip, &bbox))
    {
      case rgnPART:
	cfbImageGlyphBlt8(pDrawable, pGC, xInit, yInit, nglyph, ppci, pglyphBase);
      case rgnOUT:
	return;
    }

    if (!cfb8CheckPixels (pGC->fgPixel, pGC->bgPixel))
	cfb8SetPixels (pGC->fgPixel, pGC->bgPixel);

    leftChar = 0;

    cfbGetLongWidthAndPointer(pDrawable, widthDst, pdstBase)

#if NGLYPHS == 2
    widthGlyphs = widthGlyph << 1;
#else
#if NGLYPHS == 4
    widthGlyphs = widthGlyph << 2;
#else
    widthGlyphs = widthGlyph * NGLYPHS;
#endif
#endif

#ifdef USE_LEFTBITS
    glyphMask = endtab[widthGlyph];
    glyphBytes = GLYPHWIDTHBYTESPADDED(*ppci);
#endif

    SET_REGISTERS_FOR_WRITING(pDrawable->pScreen, ~0, GXcopy);

    pdstBase += y * widthDst;
#ifdef DO_COMMON
    if (widthGlyphs <= 32)
#endif
    	while (nglyph >= NGLYPHS)
    	{
	    nglyph -= NGLYPHS;
	    hTmp = h;
	    dstLine = pdstBase + (x >> 2);
	    xoff1 = x & 0x3;
	    xoff2 = xoff1 + widthGlyph;
#if NGLYPHS >= 3
	    xoff3 = xoff2 + widthGlyph;
#endif
#if NGLYPHS >= 4
	    xoff4 = xoff3 + widthGlyph;
#endif
#if NGLYPHS >= 5
	    xoff5 = xoff4 + widthGlyph;
#endif
	    char1 = (glyphPointer) FONTGLYPHBITS(pglyphBase, *ppci++);
	    char2 = (glyphPointer) FONTGLYPHBITS(pglyphBase, *ppci++);
#if NGLYPHS >= 3
	    char3 = (glyphPointer) FONTGLYPHBITS(pglyphBase, *ppci++);
#endif
#if NGLYPHS >= 4
	    char4 = (glyphPointer) FONTGLYPHBITS(pglyphBase, *ppci++);
#endif
#if NGLYPHS >= 5
	    char5 = (glyphPointer) FONTGLYPHBITS(pglyphBase, *ppci++);
#endif
	    oldRightChar = LastChar;
	    dst = dstLine;
	    if (xoff1)
	    {
		ew = ((widthGlyphs - (4 - xoff1)) >> 2) + 1;
#ifndef FAST_CONSTANT_OFFSET_MODE
		widthLeft = widthDst - ew;
#endif
	    	if (!leftChar)
	    	{
		    leftMask = cfbendtab[xoff1];
		    rightMask = cfbstarttab[xoff1];

#define StoreBits0	StorePixels (0,dst[0] & leftMask | \
				       GetFourPixels(c) & rightMask);
#define GetBits GetBitsNS

		    SwitchEm

#undef GetBits
#undef StoreBits0

	    	}
	    	else
	    	{
		    lshift = widthGlyph - xoff1;
    
#define StoreBits0  StorePixels (0,GetFourPixels(c));
#define GetBits GetBitsNL
    
		    SwitchEm
    
#undef GetBits
#undef StoreBits0
    
	    	}
	    }
	    else
	    {
#if NGLYPHS == 4
	    	ew = widthGlyph;    /* widthGlyphs >> 2 */
#else
	    	ew = widthGlyphs >> 2;
#endif
#ifndef FAST_CONSTANT_OFFSET_MODE
		widthLeft = widthDst - ew;
#endif

#define StoreBits0  StorePixels (0,GetFourPixels(c));
#define GetBits	GetBitsNU

	    	SwitchEm

#undef GetBits
#undef StoreBits0

	    }
	    x += widthGlyphs;
	    leftChar = oldRightChar;
    	}
    while (nglyph--)
    {
	xoff1 = x & 0x3;
	char1 = (glyphPointer) FONTGLYPHBITS(pglyphBase, *ppci++);
	hTmp = h;
	dstLine = pdstBase + (x >> 2);
	oldRightChar = char1;
	dst = dstLine;
	if (xoff1)
	{
	    ew = ((widthGlyph - (4 - xoff1)) >> 2) + 1;
#ifndef FAST_CONSTANT_OFFSET_MODE
	    widthLeft = widthDst - ew;
#endif
	    if (!leftChar)
	    {
		leftMask = cfbendtab[xoff1];
		rightMask = cfbstarttab[xoff1];

#define StoreBits0	StorePixels (0,dst[0] & leftMask | GetFourPixels(c) & rightMask);
#define GetBits	WGetBits1S

		SwitchEm
#undef GetBits
#undef StoreBits0

	    }
	    else
	    {
		lshift = widthGlyph - xoff1;

#define StoreBits0  StorePixels (0,GetFourPixels(c));
#define GetBits WGetBits1L

		SwitchEm
#undef GetBits
#undef StoreBits0

	    }
	}
	else
	{
	    ew = widthGlyph >> 2;

#ifndef FAST_CONSTANT_OFFSET_MODE
	    widthLeft = widthDst - ew;
#endif

#define StoreBits0  StorePixels (0,GetFourPixels(c));
#define GetBits	WGetBits1U

	    SwitchEm

#undef GetBits
#undef StoreBits0

	}
	x += widthGlyph;
	leftChar = oldRightChar;
    }
    /*
     * draw the tail of the last character
     */
    xoff1 = x & 3;
    if (xoff1)
    {
	rightMask = cfbstarttab[xoff1];
	leftMask = cfbendtab[xoff1];
	lshift = widthGlyph - xoff1;
	dst = pdstBase + (x >> 2);
	hTmp = h;
	while (hTmp--)
	{
	    GetBitsL;
	    *dst = (*dst & rightMask) | (GetFourPixels(c) & leftMask);
	    dst += widthDst;
	}
    }
}
#endif /* PPW == 4 */