1///////////////////////////////////////////////////////////////////////////
2//
3// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
4// Digital Ltd. LLC
5//
6// All rights reserved.
7//
8// Redistribution and use in source and binary forms, with or without
9// modification, are permitted provided that the following conditions are
10// met:
11// *       Redistributions of source code must retain the above copyright
12// notice, this list of conditions and the following disclaimer.
13// *       Redistributions in binary form must reproduce the above
14// copyright notice, this list of conditions and the following disclaimer
15// in the documentation and/or other materials provided with the
16// distribution.
17// *       Neither the name of Industrial Light & Magic nor the names of
18// its contributors may be used to endorse or promote products derived
19// from this software without specific prior written permission.
20//
21// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32//
33///////////////////////////////////////////////////////////////////////////
34
35
36#ifndef INCLUDED_IMF_CONVERT_H
37#define INCLUDED_IMF_CONVERT_H
38
39//-----------------------------------------------------------------------------
40//
41//	Routines for converting between pixel data types,
42//	with well-defined behavior for exceptional cases,
43//	without depending on how hardware and operating
44//	system handle integer overflows and floating-point
45//	exceptions.
46//
47//-----------------------------------------------------------------------------
48
49#include "half.h"
50
51
52namespace Imf {
53
54//---------------------------------------------------------
55// Conversion from half or float to unsigned int:
56//
57//	input			result
58//	---------------------------------------------------
59//
60//	finite, >= 0		input, cast to unsigned int
61//				(rounds towards zero)
62//
63//	finite, < 0		0
64//
65//	NaN			0
66//
67//	+infinity		UINT_MAX
68//
69//	-infinity		0
70//
71//---------------------------------------------------------
72
73unsigned int	halfToUint (half h);
74unsigned int	floatToUint (float f);
75
76
77//---------------------------------------------------------
78// Conversion from unsigned int or float to half:
79//
80// 	input			result
81//	---------------------------------------------------
82//
83// 	finite,			closest possible half
84// 	magnitude <= HALF_MAX
85//
86// 	finite, > HALF_MAX	+infinity
87//
88// 	finite, < -HALF_MAX	-infinity
89//
90// 	NaN			NaN
91//
92// 	+infinity		+infinity
93//
94// 	-infinity		-infinity
95//
96//---------------------------------------------------------
97
98half		uintToHalf (unsigned int ui);
99half		floatToHalf (float f);
100
101
102} // namespace Imf
103
104#endif
105