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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 /*                                                                         */
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     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 */
     96