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psfixed.h
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1 /***************************************************************************/
2 /* */
3 /* psfixed.h */
4 /* */
5 /* Adobe's code for Fixed Point Mathematics (specification only). */
6 /* */
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36 /***************************************************************************/
37 
38 
39 #ifndef PSFIXED_H_
40 #define PSFIXED_H_
41 
42 
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 
87 
88 
90 
91 
92 #endif /* PSFIXED_H_ */
93 
94 
95 /* END */
#define FT_END_HEADER
Definition: ftheader.h:54
FT_Int32 CF2_Frac
Definition: psfixed.h:49
#define FT_BEGIN_HEADER
Definition: ftheader.h:36
CF2_NumberType_
Definition: psfixed.h:80
enum CF2_NumberType_ CF2_NumberType