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

Revision 855, 3.2 KB checked in by igarcia, 19 years ago (diff)
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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
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