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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  *
9  * This software, and all works of authorship, whether in source or
10  * object code form as indicated by the copyright notice(s) included
11  * herein (collectively, the "Work") is made available, and may only be
12  * used, modified, and distributed under the FreeType Project License,
13  * LICENSE.TXT.  Additionally, subject to the terms and conditions of the
14  * FreeType Project License, each contributor to the Work hereby grants
15  * to any individual or legal entity exercising permissions granted by
16  * the FreeType Project License and this section (hereafter, "You" or
17  * "Your") a perpetual, worldwide, non-exclusive, no-charge,
18  * royalty-free, irrevocable (except as stated in this section) patent
19  * license to make, have made, use, offer to sell, sell, import, and
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21  * patent claims licensable by such contributor that are necessarily
22  * infringed by their contribution(s) alone or by combination of their
23  * contribution(s) with the Work to which such contribution(s) was
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26  * the Work or a contribution incorporated within the Work constitutes
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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 */
96