psfixed.h (3743B)
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 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 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) + 0x2000 - ( (x) < 0 ) ) >> 14 ) 76 77 78 /* signed numeric types */ 79 typedef enum CF2_NumberType_ 80 { 81 CF2_NumberFixed, /* 16.16 */ 82 CF2_NumberFrac, /* 2.30 */ 83 CF2_NumberInt /* 32.0 */ 84 85 } CF2_NumberType; 86 87 88 FT_END_HEADER 89 90 91 #endif /* PSFIXED_H_ */ 92 93 94 /* END */