105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
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/* SPDX-License-Identifier: MIT */
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/**
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@file ntv2fixed.h
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@brief Declares several fixed-point math routines. Assumes 16-bit fraction.
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@copyright (C) 2004-2021 AJA Video Systems, Inc. All rights reserved.
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**/
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#ifndef NTV2FIXED_H
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#define NTV2FIXED_H
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#include "ajatypes.h"
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#define FIXED_ONE (1<<16)
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#ifdef MSWindows
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//Visual Studio 2008 or lower
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#if (_MSC_VER <= 1500)
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#define inline __inline
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#endif
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#endif
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#if defined (AJAMac) | defined (AJAVirtual)
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// MacOS still defines the functions below in CarbonCore/FixMath.h
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#ifdef FixedRound
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#undef FixedRound
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#endif
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#ifdef FloatToFixed
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#undef FloatToFixed
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#endif
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#ifdef FixedToFloat
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#undef FixedToFloat
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#endif
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#if !defined (FixedTrunc)
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// Conflicts with FixedTrunc function in AJABase's videoutilities.h
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#define FixedTrunc(__x__) ((__x__)>>16)
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#endif
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#define FixedRound(__x__) (((__x__) < 0) ? (-((-(__x__)+0x8000)>>16)) : (((__x__) + 0x8000)>>16))
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#define FixedMix(__min__,__max__,__mixer__) (FixedRound(((__max__)-(__min__))*(__mixer__)+(__min__)))
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#define FloatToFixed(__x__) ((Fixed_)((__x__) * (float)FIXED_ONE))
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#define FixedToFloat(__x__) (((float)(__x__) / (float) 65536.0))
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#define FixedFrac(__x__) (((__x__) < 0) ? (-(__x__) & 0xFFFF)) : ((__x__) & 0xFFFF)
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#else // not AJAMac
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// Prevent unsupported-floating link errors in Linux device driver.
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// The following are not used in the Linux driver but cause the 2.6 kernel
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// linker to fail anyway.
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#ifndef __KERNEL__
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inline Fixed_ FloatToFixed(float inFlt)
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{
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return (Fixed_)(inFlt * (float)FIXED_ONE);
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}
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inline float FixedToFloat(Fixed_ inFix)
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{
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return((float)inFix/(float)65536.0);
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}
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#endif // if __KERNEL__ undefined
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inline Word FixedRound(Fixed_ inFix)
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{
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Word retValue;
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if ( inFix < 0 )
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{
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retValue = (Word)(-((-inFix+0x8000)>>16));
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}
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else
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{
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retValue = (Word)((inFix + 0x8000)>>16);
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}
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return retValue;
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}
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inline Fixed_ FixedFrac(Fixed_ inFix)
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{
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Fixed_ retValue;
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if ( inFix < 0 )
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{
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retValue = -inFix&0xFFFF;
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}
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else
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{
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retValue = inFix&0xFFFF;
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}
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return retValue;
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}
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inline Fixed_ FixedTrunc(Fixed_ inFix)
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{
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return (inFix>>16);
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}
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inline Word FixedMix(Word min, Word max, Fixed_ mixer)
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{
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Fixed_ result = (max-min)*mixer+min;
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return FixedRound(result);
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}
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#endif // else not AJAMac
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#endif // NTV2FIXED_H
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