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 */