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