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1 /***************************************************************************/ | |
2 /* */ | |
3 /* cf2fixed.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 */ | |
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33 /* FreeType Project License as well as those provided in this section, */ | |
34 /* and you accept them fully. */ | |
35 /* */ | |
36 /***************************************************************************/ | |
37 | |
38 | |
39 #ifndef __CF2FIXED_H__ | |
40 #define __CF2FIXED_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 0x10000L | |
55 #define CF2_FIXED_EPSILON 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)( ( (x) + 0x8000 ) & 0xFFFF0000L ) ) | |
66 #define cf2_floatToFixed( f ) \ | |
67 ( (CF2_Fixed)( (f) * 65536.0 + 0.5 ) ) | |
68 #define cf2_fixedAbs( x ) \ | |
69 ( (x) < 0 ? -(x) : (x) ) | |
70 #define cf2_fixedFloor( x ) \ | |
71 ( (CF2_Fixed)( (x) & 0xFFFF0000L ) ) | |
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 /* __CF2FIXED_H__ */ | |
93 | |
94 | |
95 /* END */ | |
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