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 */ 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 */ 20 /* otherwise transfer the Work, where such license applies only to those */ 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 */ 24 /* submitted. If You institute patent litigation against any entity */ 25 /* (including a cross-claim or counterclaim in a lawsuit) alleging that */ 26 /* the Work or a contribution incorporated within the Work constitutes */ 27 /* direct or contributory patent infringement, then any patent licenses */ 28 /* granted to You under this License for that Work shall terminate as of */ 29 /* the date such litigation is filed. */ 30 /* */ 31 /* By using, modifying, or distributing the Work you indicate that you */ 32 /* have read and understood the terms and conditions of the */ 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)( ( (FT_UInt32)(x) + 0x8000U ) & 0xFFFF0000UL ) ) 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)( (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 /* __CF2FIXED_H__ */ 93 94 95 /* END */ 96
