ImfConvert.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
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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