| 1 | /////////////////////////////////////////////////////////////////////////// |
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| 2 | // |
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| 3 | // Copyright (c) 2002, Industrial Light & Magic, a division of Lucas |
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| 4 | // Digital Ltd. LLC |
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| 5 | // |
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| 6 | // All rights reserved. |
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| 7 | // |
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| 8 | // Redistribution and use in source and binary forms, with or without |
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| 9 | // modification, are permitted provided that the following conditions are |
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| 10 | // met: |
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| 11 | // * Redistributions of source code must retain the above copyright |
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| 12 | // notice, this list of conditions and the following disclaimer. |
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| 13 | // * Redistributions in binary form must reproduce the above |
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| 14 | // copyright notice, this list of conditions and the following disclaimer |
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| 15 | // in the documentation and/or other materials provided with the |
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| 16 | // distribution. |
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| 17 | // * Neither the name of Industrial Light & Magic nor the names of |
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| 18 | // its contributors may be used to endorse or promote products derived |
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| 19 | // from this software without specific prior written permission. |
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| 20 | // |
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| 21 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 22 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 23 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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| 24 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| 25 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 26 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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| 27 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 28 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 29 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 30 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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| 31 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 32 | // |
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| 33 | /////////////////////////////////////////////////////////////////////////// |
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| 34 | |
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| 35 | |
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| 36 | #ifndef INCLUDED_IMF_CONVERT_H |
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| 37 | #define INCLUDED_IMF_CONVERT_H |
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| 38 | |
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| 39 | //----------------------------------------------------------------------------- |
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| 40 | // |
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| 41 | // Routines for converting between pixel data types, |
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| 42 | // with well-defined behavior for exceptional cases, |
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| 43 | // without depending on how hardware and operating |
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| 44 | // system handle integer overflows and floating-point |
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| 45 | // exceptions. |
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| 46 | // |
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| 47 | //----------------------------------------------------------------------------- |
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| 48 | |
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| 49 | #include "half.h" |
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| 50 | #include "ImfExport.h" |
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| 51 | #include "ImfNamespace.h" |
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| 52 | |
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| 53 | OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER |
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| 54 | |
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| 55 | |
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| 56 | //--------------------------------------------------------- |
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| 57 | // Conversion from half or float to unsigned int: |
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| 58 | // |
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| 59 | // input result |
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| 60 | // --------------------------------------------------- |
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| 61 | // |
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| 62 | // finite, >= 0 input, cast to unsigned int |
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| 63 | // (rounds towards zero) |
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| 64 | // |
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| 65 | // finite, < 0 0 |
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| 66 | // |
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| 67 | // NaN 0 |
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| 68 | // |
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| 69 | // +infinity UINT_MAX |
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| 70 | // |
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| 71 | // -infinity 0 |
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| 72 | // |
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| 73 | //--------------------------------------------------------- |
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| 74 | |
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| 75 | IMF_EXPORT unsigned int halfToUint (half h); |
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| 76 | IMF_EXPORT unsigned int floatToUint (float f); |
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| 77 | |
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| 78 | |
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| 79 | //--------------------------------------------------------- |
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| 80 | // Conversion from unsigned int or float to half: |
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| 81 | // |
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| 82 | // input result |
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| 83 | // --------------------------------------------------- |
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| 84 | // |
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| 85 | // finite, closest possible half |
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| 86 | // magnitude <= HALF_MAX |
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| 87 | // |
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| 88 | // finite, > HALF_MAX +infinity |
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| 89 | // |
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| 90 | // finite, < -HALF_MAX -infinity |
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| 91 | // |
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| 92 | // NaN NaN |
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| 93 | // |
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| 94 | // +infinity +infinity |
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| 95 | // |
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| 96 | // -infinity -infinity |
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| 97 | // |
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| 98 | //--------------------------------------------------------- |
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| 99 | |
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| 100 | IMF_EXPORT half uintToHalf (unsigned int ui); |
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| 101 | IMF_EXPORT half floatToHalf (float f); |
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| 102 | |
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| 103 | |
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| 104 | OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT |
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| 105 | |
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| 106 | |
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| 107 | #endif |
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| 108 | |
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