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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.                        */
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  9. /*  This software, and all works of authorship, whether in source or       */
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  12. /*  used, modified, and distributed under the FreeType Project License,    */
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  14. /*  FreeType Project License, each contributor to the Work hereby grants   */
  15. /*  to any individual or legal entity exercising permissions granted by    */
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  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)( ( (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.