1 ///////////////////////////////////////////////////////////////////////////
3 // Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
6 // All rights reserved.
8 // Redistribution and use in source and binary forms, with or without
9 // modification, are permitted provided that the following conditions are
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
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.
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.
33 ///////////////////////////////////////////////////////////////////////////
36 #ifndef INCLUDED_IMF_CONVERT_H
37 #define INCLUDED_IMF_CONVERT_H
39 //-----------------------------------------------------------------------------
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
47 //-----------------------------------------------------------------------------
54 //---------------------------------------------------------
55 // Conversion from half or float to unsigned int:
58 // ---------------------------------------------------
60 // finite, >= 0 input, cast to unsigned int
61 // (rounds towards zero)
71 //---------------------------------------------------------
73 unsigned int halfToUint (half h);
74 unsigned int floatToUint (float f);
77 //---------------------------------------------------------
78 // Conversion from unsigned int or float to half:
81 // ---------------------------------------------------
83 // finite, closest possible half
84 // magnitude <= HALF_MAX
86 // finite, > HALF_MAX +infinity
88 // finite, < -HALF_MAX -infinity
92 // +infinity +infinity
94 // -infinity -infinity
96 //---------------------------------------------------------
98 half uintToHalf (unsigned int ui);
99 half floatToHalf (float f);