source: NonGTP/OpenEXR/include/IlmImf/ImfConvert.h @ 855

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
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// *       Redistributions in binary form must reproduce the above
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// in the documentation and/or other materials provided with the
// distribution.
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// its contributors may be used to endorse or promote products derived
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///////////////////////////////////////////////////////////////////////////


#ifndef INCLUDED_IMF_CONVERT_H
#define INCLUDED_IMF_CONVERT_H

//-----------------------------------------------------------------------------
//
//      Routines for converting between pixel data types,
//      with well-defined behavior for exceptional cases,
//      without depending on how hardware and operating
//      system handle integer overflows and floating-point
//      exceptions.
//
//-----------------------------------------------------------------------------

#include <half.h>


namespace Imf {

//---------------------------------------------------------
// Conversion from half or float to unsigned int:
//
//      input                   result
//      ---------------------------------------------------
//
//      finite, >= 0            input, cast to unsigned int
//                              (rounds towards zero)
//
//      finite, < 0             0
//
//      NaN                     0
//
//      +infinity               UINT_MAX
//
//      -infinity               0
//
//---------------------------------------------------------

unsigned int    halfToUint (half h);
unsigned int    floatToUint (float f);


//---------------------------------------------------------
// Conversion from unsigned int or float to half:
//
//      input                   result
//      ---------------------------------------------------
//
//      finite,                 closest possible half
//      magnitude <= HALF_MAX
//
//      finite, > HALF_MAX      +infinity
//
//      finite, < -HALF_MAX     -infinity
//
//      NaN                     NaN
//
//      +infinity               +infinity
//
//      -infinity               -infinity
//
//---------------------------------------------------------

half            uintToHalf (unsigned int ui);
half            floatToHalf (float f);


} // namespace Imf

#endif