ntv2fixed.h

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/* SPDX-License-Identifier: MIT */
#ifndef NTV2FIXED_H
#define NTV2FIXED_H

#include "ajatypes.h"

#define FIXED_ONE (1<<16)

#ifdef  MSWindows
    //Visual Studio 2008 or lower
    #if (_MSC_VER <= 1500)
        #define inline __inline
    #endif
#endif

#if defined (AJAMac) | defined (AJAVirtual)
    //  MacOS still defines the functions below in CarbonCore/FixMath.h
    #ifdef FixedRound
        #undef FixedRound
    #endif
    #ifdef FloatToFixed
        #undef FloatToFixed
    #endif
    #ifdef FixedToFloat
        #undef FixedToFloat
    #endif
    #if !defined (FixedTrunc)
        //  Conflicts with FixedTrunc function in AJABase's videoutilities.h
        #define FixedTrunc(__x__) ((__x__)>>16)
    #endif
    #define FixedRound(__x__)                   (((__x__) < 0) ? (-((-(__x__)+0x8000)>>16)) :  (((__x__) + 0x8000)>>16))
    #define FixedMix(__min__,__max__,__mixer__) (FixedRound(((__max__)-(__min__))*(__mixer__)+(__min__)))
    #define FloatToFixed(__x__)                 ((Fixed_)((__x__) * (float)FIXED_ONE))
    #define FixedToFloat(__x__)                 (((float)(__x__) / (float) 65536.0))
    #define FixedFrac(__x__)                    (((__x__) < 0) ? (-(__x__) & 0xFFFF)) :  ((__x__) & 0xFFFF)

#else   //  not AJAMac

    // Prevent unsupported-floating link errors in Linux device driver.
    // The following are not used in the Linux driver but cause the 2.6 kernel 
    // linker to fail anyway.
    #ifndef __KERNEL__
        inline  Fixed_  FloatToFixed(float inFlt)
        { 
          return (Fixed_)(inFlt * (float)FIXED_ONE); 
        }

        inline  float   FixedToFloat(Fixed_ inFix)
        { 
          return((float)inFix/(float)65536.0); 
        }
    #endif  //  if __KERNEL__ undefined

    inline  Word    FixedRound(Fixed_ inFix)
    { 
      Word retValue;
      
      if ( inFix < 0 ) 
      {
        retValue = (Word)(-((-inFix+0x8000)>>16));
      }
      else
      {
        retValue = (Word)((inFix + 0x8000)>>16);
      }
      return retValue;
    }

    inline  Fixed_  FixedFrac(Fixed_ inFix)
    { 
      Fixed_ retValue;
      
      if ( inFix < 0 ) 
      {
        retValue = -inFix&0xFFFF;
      }
      else
      {
        retValue = inFix&0xFFFF;
      }
      
      return retValue;
    }

    inline Fixed_ FixedTrunc(Fixed_ inFix)
    {
      return (inFix>>16);
    }

    inline Word FixedMix(Word min, Word max, Fixed_ mixer)
    {
        Fixed_ result = (max-min)*mixer+min;

        return FixedRound(result);
    }
#endif  //  else not AJAMac

#endif  //  NTV2FIXED_H