icint.h

按照官方的说法：Cairo is a vector graphics library with cross-device output support. 翻译过来

	FbStorePart(dst,sizeof (FbBits) - 2,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 5): \
	FbStorePart(dst,sizeof (FbBits) - 5,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD32,xor); \
	break; \
    case (sizeof (FbBits) - 4) | (1 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 4) | (2 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD16,xor); \
	break; \
    case (sizeof (FbBits) - 4) | (3 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 2,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 4): \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD32,xor); \
	break;

#define FbDoRightMaskByteRRop6Cases(dst,xor) \
    case 4: \
	FbStorePart(dst,0,CARD32,xor); \
	break; \
    case 5: \
	FbStorePart(dst,0,CARD32,xor); \
	FbStorePart(dst,4,CARD8,xor); \
	break; \
    case 6: \
	FbStorePart(dst,0,CARD32,xor); \
	FbStorePart(dst,4,CARD16,xor); \
	break; \
    case 7: \
	FbStorePart(dst,0,CARD32,xor); \
	FbStorePart(dst,4,CARD16,xor); \
	FbStorePart(dst,6,CARD8,xor); \
	break;
#else
#define FbDoLeftMaskByteRRop6Cases(dst,xor)
#define FbDoRightMaskByteRRop6Cases(dst,xor)
#endif

#define FbDoLeftMaskByteRRop(dst,lb,l,and,xor) { \
    switch (lb) { \
    FbDoLeftMaskByteRRop6Cases(dst,xor) \
    case (sizeof (FbBits) - 3) | (1 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 3,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 3) | (2 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 3,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 2,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 2) | (1 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 2,CARD8,xor); \
	break; \
    case sizeof (FbBits) - 3: \
	FbStorePart(dst,sizeof (FbBits) - 3,CARD8,xor); \
    case sizeof (FbBits) - 2: \
	FbStorePart(dst,sizeof (FbBits) - 2,CARD16,xor); \
	break; \
    case sizeof (FbBits) - 1: \
	FbStorePart(dst,sizeof (FbBits) - 1,CARD8,xor); \
	break; \
    default: \
	*dst = FbDoMaskRRop(*dst, and, xor, l); \
	break; \
    } \
}

#define FbDoRightMaskByteRRop(dst,rb,r,and,xor) { \
    switch (rb) { \
    case 1: \
	FbStorePart(dst,0,CARD8,xor); \
	break; \
    case 2: \
	FbStorePart(dst,0,CARD16,xor); \
	break; \
    case 3: \
	FbStorePart(dst,0,CARD16,xor); \
	FbStorePart(dst,2,CARD8,xor); \
	break; \
    FbDoRightMaskByteRRop6Cases(dst,xor) \
    default: \
	*dst = FbDoMaskRRop (*dst, and, xor, r); \
    } \
}
#endif

#define FbMaskStip(x,w,l,n,r) { \
    n = (w); \
    r = FbRightStipMask((x)+n); \
    l = FbLeftStipMask(x); \
    if (l) { \
	n -= FB_STIP_UNIT - ((x) & FB_STIP_MASK); \
	if (n < 0) { \
	    n = 0; \
	    l &= r; \
	    r = 0; \
	} \
    } \
    n >>= FB_STIP_SHIFT; \
}

/*
 * These macros are used to transparently stipple
 * in copy mode; the expected usage is with 'n' constant
 * so all of the conditional parts collapse into a minimal
 * sequence of partial word writes
 *
 * 'n' is the bytemask of which bytes to store, 'a' is the address
 * of the FbBits base unit, 'o' is the offset within that unit
 *
 * The term "lane" comes from the hardware term "byte-lane" which
 */

#define FbLaneCase1(n,a,o)  ((n) == 0x01 ? \
			     (*(CARD8 *) ((a)+FbPatternOffset(o,CARD8)) = \
			      fgxor) : 0)
#define FbLaneCase2(n,a,o)  ((n) == 0x03 ? \
			     (*(CARD16 *) ((a)+FbPatternOffset(o,CARD16)) = \
			      fgxor) : \
			     ((void)FbLaneCase1((n)&1,a,o), \
				    FbLaneCase1((n)>>1,a,(o)+1)))
#define FbLaneCase4(n,a,o)  ((n) == 0x0f ? \
			     (*(CARD32 *) ((a)+FbPatternOffset(o,CARD32)) = \
			      fgxor) : \
			     ((void)FbLaneCase2((n)&3,a,o), \
				    FbLaneCase2((n)>>2,a,(o)+2)))
#define FbLaneCase8(n,a,o)  ((n) == 0x0ff ? (*(FbBits *) ((a)+(o)) = fgxor) : \
			     ((void)FbLaneCase4((n)&15,a,o), \
				    FbLaneCase4((n)>>4,a,(o)+4)))

#if FB_SHIFT == 6
#define FbLaneCase(n,a)   FbLaneCase8(n,(CARD8 *) (a),0)
#endif

#if FB_SHIFT == 5
#define FbLaneCase(n,a)   FbLaneCase4(n,(CARD8 *) (a),0)
#endif

/* Rotate a filled pixel value to the specified alignement */
#define FbRot24(p,b)	    (FbScrRight(p,b) | FbScrLeft(p,24-(b)))
#define FbRot24Stip(p,b)    (FbStipRight(p,b) | FbStipLeft(p,24-(b)))

/* step a filled pixel value to the next/previous FB_UNIT alignment */
#define FbNext24Pix(p)	(FbRot24(p,(24-FB_UNIT%24)))
#define FbPrev24Pix(p)	(FbRot24(p,FB_UNIT%24))
#define FbNext24Stip(p)	(FbRot24(p,(24-FB_STIP_UNIT%24)))
#define FbPrev24Stip(p)	(FbRot24(p,FB_STIP_UNIT%24))

/* step a rotation value to the next/previous rotation value */
#if FB_UNIT == 64
#define FbNext24Rot(r)        ((r) == 16 ? 0 : (r) + 8)
#define FbPrev24Rot(r)        ((r) == 0 ? 16 : (r) - 8)

#if IMAGE_BYTE_ORDER == MSBFirst
#define FbFirst24Rot(x)		(((x) + 8) % 24)
#else
#define FbFirst24Rot(x)		((x) % 24)
#endif

#endif

#if FB_UNIT == 32
#define FbNext24Rot(r)        ((r) == 0 ? 16 : (r) - 8)
#define FbPrev24Rot(r)        ((r) == 16 ? 0 : (r) + 8)

#if IMAGE_BYTE_ORDER == MSBFirst
#define FbFirst24Rot(x)		(((x) + 16) % 24)
#else
#define FbFirst24Rot(x)		((x) % 24)
#endif
#endif

#define FbNext24RotStip(r)        ((r) == 0 ? 16 : (r) - 8)
#define FbPrev24RotStip(r)        ((r) == 16 ? 0 : (r) + 8)

/* Whether 24-bit specific code is needed for this filled pixel value */
#define FbCheck24Pix(p)	((p) == FbNext24Pix(p))

#define FbGetPixels(icpixels, pointer, _stride_, _bpp_, xoff, yoff) { \
    (pointer) = icpixels->data; \
    (_stride_) = icpixels->stride / sizeof(pixman_bits_t); \
    (_bpp_) = icpixels->bpp; \
    (xoff) = icpixels->x; /* XXX: fb.h had this ifdef'd to constant 0. Why? */ \
    (yoff) = icpixels->y; /* XXX: fb.h had this ifdef'd to constant 0. Why? */ \
}

#define FbGetStipPixels(icpixels, pointer, _stride_, _bpp_, xoff, yoff) { \
    (pointer) = (FbStip *) icpixels->data; \
    (_stride_) = icpixels->stride / sizeof(FbStip); \
    (_bpp_) = icpixels->bpp; \
    (xoff) = icpixels->x; \
    (yoff) = icpixels->y; \
}

#ifdef FB_OLD_SCREEN
#define BitsPerPixel(d) (\
    ((1 << PixmapWidthPaddingInfo[d].padBytesLog2) * 8 / \
    (PixmapWidthPaddingInfo[d].padRoundUp+1)))
#endif

#define FbPowerOfTwo(w)	    (((w) & ((w) - 1)) == 0)
/*
 * Accelerated tiles are power of 2 width <= FB_UNIT
 */
#define FbEvenTile(w)	    ((w) <= FB_UNIT && FbPowerOfTwo(w))
/*
 * Accelerated stipples are power of 2 width and <= FB_UNIT/dstBpp
 * with dstBpp a power of 2 as well
 */
#define FbEvenStip(w,bpp)   ((w) * (bpp) <= FB_UNIT && FbPowerOfTwo(w) && FbPowerOfTwo(bpp))

/*
 * icblt.c
 */
pixman_private void
fbBlt (pixman_bits_t   *src,
       FbStride	srcStride,
       int	srcX,

       FbBits   *dst,
       FbStride dstStride,
       int	dstX,

       int	width,
       int	height,

       int	alu,
       FbBits	pm,
       int	bpp,

       Bool	reverse,
       Bool	upsidedown);

pixman_private void
fbBlt24 (pixman_bits_t	    *srcLine,
	 FbStride   srcStride,
	 int	    srcX,

	 FbBits	    *dstLine,
	 FbStride   dstStride,
	 int	    dstX,

	 int	    width,
	 int	    height,

	 int	    alu,
	 FbBits	    pm,

	 Bool	    reverse,
	 Bool	    upsidedown);

pixman_private void
fbBltStip (FbStip   *src,
	   FbStride srcStride,	    /* in FbStip units, not FbBits units */
	   int	    srcX,

	   FbStip   *dst,
	   FbStride dstStride,	    /* in FbStip units, not FbBits units */
	   int	    dstX,

	   int	    width,
	   int	    height,

	   int	    alu,
	   FbBits   pm,
	   int	    bpp);

/*
 * icbltone.c
 */
pixman_private void
fbBltOne (FbStip   *src,
	  FbStride srcStride,
	  int	   srcX,
	  FbBits   *dst,
	  FbStride dstStride,
	  int	   dstX,
	  int	   dstBpp,

	  int	   width,
	  int	   height,

	  FbBits   fgand,
	  FbBits   fbxor,
	  FbBits   bgand,
	  FbBits   bgxor);

#ifdef FB_24BIT
pixman_private void
fbBltOne24 (FbStip    *src,
	  FbStride  srcStride,	    /* FbStip units per scanline */
	  int	    srcX,	    /* bit position of source */
	  FbBits    *dst,
	  FbStride  dstStride,	    /* FbBits units per scanline */
	  int	    dstX,	    /* bit position of dest */
	  int	    dstBpp,	    /* bits per destination unit */

	  int	    width,	    /* width in bits of destination */
	  int	    height,	    /* height in scanlines */

	  FbBits    fgand,	    /* rrop values */
	  FbBits    fgxor,
	  FbBits    bgand,
	  FbBits    bgxor);
#endif

/*
 * icstipple.c
 */

pixman_private void
fbTransparentSpan (pixman_bits_t   *dst,
		   pixman_bits_t   stip,
		   pixman_bits_t   fgxor,
		   int	    n);

pixman_private void
fbEvenStipple (pixman_bits_t   *dst,
	       FbStride dstStride,
	       int	dstX,
	       int	dstBpp,

	       int	width,
	       int	height,

	       FbStip   *stip,
	       FbStride	stipStride,
	       int	stipHeight,

	       FbBits   fgand,
	       FbBits   fgxor,
	       FbBits   bgand,
	       FbBits   bgxor,

	       int	xRot,
	       int	yRot);

pixman_private void
fbOddStipple (pixman_bits_t	*dst,
	      FbStride	dstStride,
	      int	dstX,
	      int	dstBpp,

	      int	width,
	      int	height,

	      FbStip	*stip,
	      FbStride	stipStride,
	      int	stipWidth,
	      int	stipHeight,

	      FbBits	fgand,
	      FbBits	fgxor,
	      FbBits	bgand,
	      FbBits	bgxor,

	      int	xRot,
	      int	yRot);

pixman_private void
fbStipple (pixman_bits_t   *dst,
	   FbStride dstStride,
	   int	    dstX,
	   int	    dstBpp,

	   int	    width,