1/****************************************************************************
2 *
3 * psfixed.h
4 *
5 * Adobe's code for Fixed-Point Mathematics (specification only).
6 *
7 * Copyright 2007-2013 Adobe Systems Incorporated.
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37
38
39#ifndef PSFIXED_H_
40#define PSFIXED_H_
41
42
43FT_BEGIN_HEADER
44
45
46 /* rasterizer integer and fixed-point arithmetic must be 32-bit */
47
48#define CF2_Fixed CF2_F16Dot16
49 typedef FT_Int32 CF2_Frac; /* 2.30 fixed-point */
50
51
52#define CF2_FIXED_MAX ( (CF2_Fixed)0x7FFFFFFFL )
53#define CF2_FIXED_MIN ( (CF2_Fixed)0x80000000L )
54#define CF2_FIXED_ONE ( (CF2_Fixed)0x10000L )
55#define CF2_FIXED_EPSILON ( (CF2_Fixed)0x0001 )
56
57 /* in C 89, left and right shift of negative numbers is */
58 /* implementation specific behaviour in the general case */
59
60#define cf2_intToFixed( i ) \
61 ( (CF2_Fixed)( (FT_UInt32)(i) << 16 ) )
62#define cf2_fixedToInt( x ) \
63 ( (FT_Short)( ( (FT_UInt32)(x) + 0x8000U ) >> 16 ) )
64#define cf2_fixedRound( x ) \
65 ( (CF2_Fixed)( ( (FT_UInt32)(x) + 0x8000U ) & 0xFFFF0000UL ) )
66#define cf2_doubleToFixed( f ) \
67 ( (CF2_Fixed)( (f) * 65536.0 + 0.5 ) )
68#define cf2_fixedAbs( x ) \
69 ( (x) < 0 ? NEG_INT32( x ) : (x) )
70#define cf2_fixedFloor( x ) \
71 ( (CF2_Fixed)( (FT_UInt32)(x) & 0xFFFF0000UL ) )
72#define cf2_fixedFraction( x ) \
73 ( (x) - cf2_fixedFloor( x ) )
74#define cf2_fracToFixed( x ) \
75 ( ( (x) + 0x2000 - ( (x) < 0 ) ) >> 14 )
76
77
78 /* signed numeric types */
79 typedef enum CF2_NumberType_
80 {
81 CF2_NumberFixed, /* 16.16 */
82 CF2_NumberFrac, /* 2.30 */
83 CF2_NumberInt /* 32.0 */
84
85 } CF2_NumberType;
86
87
88FT_END_HEADER
89
90
91#endif /* PSFIXED_H_ */
92
93
94/* END */
95