1 /***************************************************************************/
2 /* */
3 /* psfixed.h */
4 /* */
5 /* Adobe's code for Fixed Point Mathematics (specification only). */
6 /* */
7 /* Copyright 2007-2013 Adobe Systems Incorporated. */
8 /* */
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35 /* */
36 /***************************************************************************/
37
38
39 #ifndef PSFIXED_H_
40 #define PSFIXED_H_
41
42
43 FT_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) < 0 ? -( ( -(x) + 0x2000 ) >> 14 ) \
76 : ( ( (x) + 0x2000 ) >> 14 ) )
77
78
79 /* signed numeric types */
80 typedef enum CF2_NumberType_
81 {
82 CF2_NumberFixed, /* 16.16 */
83 CF2_NumberFrac, /* 2.30 */
84 CF2_NumberInt /* 32.0 */
85
86 } CF2_NumberType;
87
88
89 FT_END_HEADER
90
91
92 #endif /* PSFIXED_H_ */
93
94
95 /* END */