icint.h

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

/*
 * Copyright © 2003 Carl Worth
 *
 * 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 the name of Carl Worth not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Carl Worth makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * CARL WORTH DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL CARL WORTH 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.
 */

#ifndef _ICINT_H_
#define _ICINT_H_

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include "pixman.h"

#include <stdlib.h>
#include <string.h>
#include <limits.h>

#include "slim_internal.h"

#ifndef __GNUC__
#define __inline
#endif

#if defined(__GNUC__)
#define INLINE __inline__
#else
#define INLINE
#endif

#undef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#undef MAX
#define MAX(a,b) ((a) > (b) ? (a) : (b))

/* C89 has implementation-defined behavior for % with negative operands.
   C99 has well-defined behavior which is that / with integers rounds toward zero
       and a%b is defined so that (a/b)*b + a%b == a.

   The C99 version gives negative remainders rather than the modulus
   in [0 .. b-1] that we want. This macro avoids using % with negative
   operands to avoid both problems.

   a and b are integers. b > 0.
*/
#define MOD(a, b) ((b) == 1 ? 0 : (a) >= 0 ? (a) % (b) : (b) - (-(a) - 1) % (b) - 1)

typedef struct _FbPoint {
	int16_t    x,y ;
} FbPoint;

typedef unsigned int	Mask;

#define GXcopy		0x3
#define GXor		0x7
#define ClipByChildren  0
#define PolyEdgeSharp   0
#define PolyModePrecise 0
#define CPClipMask      (1 << 6)
#define CPLastBit       11

/* Define any names that the server code will be expecting in
 * terms of libpixman names. */

typedef uint8_t			CARD8;
typedef uint16_t		CARD16;
typedef uint32_t		CARD32;
typedef int16_t			INT16;

typedef int			Bool;
#define FALSE 0
#define TRUE  1

typedef pixman_bits_t		FbBits;
typedef pixman_image_t*		PicturePtr;
typedef pixman_box16_t		BoxRec;
typedef pixman_box16_t*		BoxPtr;

typedef pixman_point_fixed_t	xPointFixed;
typedef pixman_line_fixed_t	xLineFixed;
typedef pixman_trapezoid_t	xTrapezoid;
typedef pixman_triangle_t	xTriangle;

/* These few definitions avoid me needing to include servermd.h and misc.h from Xserver/include */
#ifndef BITMAP_SCANLINE_PAD
#define BITMAP_SCANLINE_PAD  32
#define LOG2_BITMAP_PAD		5
#define LOG2_BYTES_PER_SCANLINE_PAD	2
#endif

#define LSBFirst 0
#define MSBFirst 1

#ifdef WORDS_BIGENDIAN
#  define IMAGE_BYTE_ORDER MSBFirst
#  define BITMAP_BIT_ORDER MSBFirst
#else
#  define IMAGE_BYTE_ORDER LSBFirst
#  define BITMAP_BIT_ORDER LSBFirst
#endif

#define MAXSHORT SHRT_MAX
#define MINSHORT SHRT_MIN

/* XXX: What do we need from here?
#include "picture.h"
*/

#include "pixman.h"

/* XXX: Most of this file is straight from fb.h and I imagine we can
   drop quite a bit of it. Once the real ic code starts to come
   together I can probably figure out what is not needed here. */

#define FB_UNIT	    (1 << FB_SHIFT)
#define FB_HALFUNIT (1 << (FB_SHIFT-1))
#define FB_MASK	    (FB_UNIT - 1)
#define FB_ALLONES  ((pixman_bits_t) -1)

/* whether to bother to include 24bpp support */
#ifndef ICNO24BIT
#define FB_24BIT
#endif

/*
 * Unless otherwise instructed, ic includes code to advertise 24bpp
 * windows with 32bpp image format for application compatibility
 */

#ifdef FB_24BIT
#ifndef ICNO24_32
#define FB_24_32BIT
#endif
#endif

#define FB_STIP_SHIFT	LOG2_BITMAP_PAD
#define FB_STIP_UNIT	(1 << FB_STIP_SHIFT)
#define FB_STIP_MASK	(FB_STIP_UNIT - 1)
#define FB_STIP_ALLONES	((FbStip) -1)

#define FB_STIP_ODDSTRIDE(s)	(((s) & (FB_MASK >> FB_STIP_SHIFT)) != 0)
#define FB_STIP_ODDPTR(p)	((((long) (p)) & (FB_MASK >> 3)) != 0)

#define FbStipStrideToBitsStride(s) (((s) >> (FB_SHIFT - FB_STIP_SHIFT)))
#define FbBitsStrideToStipStride(s) (((s) << (FB_SHIFT - FB_STIP_SHIFT)))

#define FbFullMask(n)   ((n) == FB_UNIT ? FB_ALLONES : ((((FbBits) 1) << n) - 1))

typedef uint32_t	    FbStip;
typedef int		    FbStride;

#ifdef FB_DEBUG
extern void fbValidateDrawable(DrawablePtr d);
extern void fbInitializeDrawable(DrawablePtr d);
extern void fbSetBits (FbStip *bits, int stride, FbStip data);
#define FB_HEAD_BITS   (FbStip) (0xbaadf00d)
#define FB_TAIL_BITS   (FbStip) (0xbaddf0ad)
#else
#define fbValidateDrawable(d)
#define fdInitializeDrawable(d)
#endif

#if BITMAP_BIT_ORDER == LSBFirst
#define FbScrLeft(x,n)	((x) >> (n))
#define FbScrRight(x,n)	((x) << (n))
/* #define FbLeftBits(x,n)	((x) & ((((FbBits) 1) << (n)) - 1)) */
#define FbLeftStipBits(x,n) ((x) & ((((FbStip) 1) << (n)) - 1))
#define FbStipMoveLsb(x,s,n)	(FbStipRight (x,(s)-(n)))
#define FbPatternOffsetBits	0
#else
#define FbScrLeft(x,n)	((x) << (n))
#define FbScrRight(x,n)	((x) >> (n))
/* #define FbLeftBits(x,n)	((x) >> (FB_UNIT - (n))) */
#define FbLeftStipBits(x,n) ((x) >> (FB_STIP_UNIT - (n)))
#define FbStipMoveLsb(x,s,n)	(x)
#define FbPatternOffsetBits	(sizeof (FbBits) - 1)
#endif

#define FbStipLeft(x,n)	FbScrLeft(x,n)
#define FbStipRight(x,n) FbScrRight(x,n)

#define FbRotLeft(x,n)	FbScrLeft(x,n) | (n ? FbScrRight(x,FB_UNIT-n) : 0)
#define FbRotRight(x,n)	FbScrRight(x,n) | (n ? FbScrLeft(x,FB_UNIT-n) : 0)

#define FbRotStipLeft(x,n)  FbStipLeft(x,n) | (n ? FbStipRight(x,FB_STIP_UNIT-n) : 0)
#define FbRotStipRight(x,n)  FbStipRight(x,n) | (n ? FbStipLeft(x,FB_STIP_UNIT-n) : 0)

#define FbLeftMask(x)	    ( ((x) & FB_MASK) ? \
			     FbScrRight(FB_ALLONES,(x) & FB_MASK) : 0)
#define FbRightMask(x)	    ( ((FB_UNIT - (x)) & FB_MASK) ? \
			     FbScrLeft(FB_ALLONES,(FB_UNIT - (x)) & FB_MASK) : 0)

#define FbLeftStipMask(x)   ( ((x) & FB_STIP_MASK) ? \
			     FbStipRight(FB_STIP_ALLONES,(x) & FB_STIP_MASK) : 0)
#define FbRightStipMask(x)  ( ((FB_STIP_UNIT - (x)) & FB_STIP_MASK) ? \
			     FbScrLeft(FB_STIP_ALLONES,(FB_STIP_UNIT - (x)) & FB_STIP_MASK) : 0)

#define FbBitsMask(x,w)	(FbScrRight(FB_ALLONES,(x) & FB_MASK) & \
			 FbScrLeft(FB_ALLONES,(FB_UNIT - ((x) + (w))) & FB_MASK))

#define FbStipMask(x,w)	(FbStipRight(FB_STIP_ALLONES,(x) & FB_STIP_MASK) & \
			 FbStipLeft(FB_STIP_ALLONES,(FB_STIP_UNIT - ((x)+(w))) & FB_STIP_MASK))

#define FbMaskBits(x,w,l,n,r) { \
    n = (w); \
    r = FbRightMask((x)+n); \
    l = FbLeftMask(x); \
    if (l) { \
	n -= FB_UNIT - ((x) & FB_MASK); \
	if (n < 0) { \
	    n = 0; \
	    l &= r; \
	    r = 0; \
	} \
    } \
    n >>= FB_SHIFT; \
}

#ifdef ICNOPIXADDR
#define FbMaskBitsBytes(x,w,copy,l,lb,n,r,rb) FbMaskBits(x,w,l,n,r)
#define FbDoLeftMaskByteRRop(dst,lb,l,and,xor) { \
    *dst = FbDoMaskRRop(*dst,and,xor,l); \
}
#define FbDoRightMaskByteRRop(dst,rb,r,and,xor) { \
    *dst = FbDoMaskRRop(*dst,and,xor,r); \
}
#else

#define FbByteMaskInvalid   0x10

#define FbPatternOffset(o,t)  ((o) ^ (FbPatternOffsetBits & ~(sizeof (t) - 1)))

#define FbPtrOffset(p,o,t)		((t *) ((CARD8 *) (p) + (o)))
#define FbSelectPatternPart(xor,o,t)	((xor) >> (FbPatternOffset (o,t) << 3))
#define FbStorePart(dst,off,t,xor)	(*FbPtrOffset(dst,off,t) = \
					 FbSelectPart(xor,off,t))
#ifndef FbSelectPart
#define FbSelectPart(x,o,t) FbSelectPatternPart(x,o,t)
#endif

#define FbMaskBitsBytes(x,w,copy,l,lb,n,r,rb) { \
    n = (w); \
    lb = 0; \
    rb = 0; \
    r = FbRightMask((x)+n); \
    if (r) { \
	/* compute right byte length */ \
	if ((copy) && (((x) + n) & 7) == 0) { \
	    rb = (((x) + n) & FB_MASK) >> 3; \
	} else { \
	    rb = FbByteMaskInvalid; \
	} \
    } \
    l = FbLeftMask(x); \
    if (l) { \
	/* compute left byte length */ \
	if ((copy) && ((x) & 7) == 0) { \
	    lb = ((x) & FB_MASK) >> 3; \
	} else { \
	    lb = FbByteMaskInvalid; \
	} \
	/* subtract out the portion painted by leftMask */ \
	n -= FB_UNIT - ((x) & FB_MASK); \
	if (n < 0) { \
	    if (lb != FbByteMaskInvalid) { \
		if (rb == FbByteMaskInvalid) { \
		    lb = FbByteMaskInvalid; \
		} else if (rb) { \
		    lb |= (rb - lb) << (FB_SHIFT - 3); \
		    rb = 0; \
		} \
	    } \
	    n = 0; \
	    l &= r; \
	    r = 0; \
	}\
    } \
    n >>= FB_SHIFT; \
}

#if FB_SHIFT == 6
#define FbDoLeftMaskByteRRop6Cases(dst,xor) \
    case (sizeof (FbBits) - 7) | (1 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 7,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 7) | (2 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 7,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 7) | (3 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 7,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD16,xor); \
	break; \
    case (sizeof (FbBits) - 7) | (4 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 7,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 7) | (5 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 7,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD16,xor); \
	break; \
    case (sizeof (FbBits) - 7) | (6 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 7,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 2,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 7): \
	FbStorePart(dst,sizeof (FbBits) - 7,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD32,xor); \
	break; \
    case (sizeof (FbBits) - 6) | (1 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 6) | (2 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD16,xor); \
	break; \
    case (sizeof (FbBits) - 6) | (3 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 6) | (4 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD16,xor); \
	break; \
    case (sizeof (FbBits) - 6) | (5 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 2,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 6): \
	FbStorePart(dst,sizeof (FbBits) - 6,CARD16,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD32,xor); \
	break; \
    case (sizeof (FbBits) - 5) | (1 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 5,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 5) | (2 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 5,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD8,xor); \
	break; \
    case (sizeof (FbBits) - 5) | (3 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 5,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD16,xor); \
	break; \
    case (sizeof (FbBits) - 5) | (4 << (FB_SHIFT - 3)): \
	FbStorePart(dst,sizeof (FbBits) - 5,CARD8,xor); \
	FbStorePart(dst,sizeof (FbBits) - 4,CARD16,xor); \