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 52 namespace 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 73 unsigned int halfToUint (half h); 74 unsigned 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 98 half uintToHalf (unsigned int ui); 99 half floatToHalf (float f); 100 101 102 } // namespace Imf 103 104 #endif 105