105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
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// Digital Ltd. LLC
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Industrial Light & Magic nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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///////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDED_IMF_CONVERT_H
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#define INCLUDED_IMF_CONVERT_H
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//-----------------------------------------------------------------------------
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//
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// Routines for converting between pixel data types,
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// with well-defined behavior for exceptional cases,
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// without depending on how hardware and operating
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// system handle integer overflows and floating-point
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// exceptions.
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//
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//-----------------------------------------------------------------------------
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#include "half.h"
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namespace Imf {
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//---------------------------------------------------------
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// Conversion from half or float to unsigned int:
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//
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// input result
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// ---------------------------------------------------
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//
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// finite, >= 0 input, cast to unsigned int
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// (rounds towards zero)
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//
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// finite, < 0 0
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//
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// NaN 0
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//
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// +infinity UINT_MAX
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//
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// -infinity 0
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//
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//---------------------------------------------------------
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unsigned int halfToUint (half h);
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unsigned int floatToUint (float f);
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//---------------------------------------------------------
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// Conversion from unsigned int or float to half:
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//
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// input result
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// ---------------------------------------------------
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//
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// finite, closest possible half
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// magnitude <= HALF_MAX
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//
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// finite, > HALF_MAX +infinity
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//
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// finite, < -HALF_MAX -infinity
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//
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// NaN NaN
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//
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// +infinity +infinity
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//
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// -infinity -infinity
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//
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//---------------------------------------------------------
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half uintToHalf (unsigned int ui);
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half floatToHalf (float f);
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} // namespace Imf
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#endif
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