/usr/include/OpenEXR/ImfConvert.h is in libopenexr-dev 1.6.1-7ubuntu1.
This file is owned by root:root, with mode 0o644.
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//
// 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
// met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////
#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
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