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Open Source Computer Vision Library
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139 lines
3.3 KiB
139 lines
3.3 KiB
/////////////////////////////////////////////////////////////////////////// |
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// |
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// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas |
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// Digital Ltd. LLC |
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// |
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// All rights reserved. |
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// |
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// Redistribution and use in source and binary forms, with or without |
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// modification, are permitted provided that the following conditions are |
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// met: |
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// * Redistributions of source code must retain the above copyright |
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// notice, this list of conditions and the following disclaimer. |
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// * Redistributions in binary form must reproduce the above |
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// copyright notice, this list of conditions and the following disclaimer |
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// in the documentation and/or other materials provided with the |
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// distribution. |
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// * Neither the name of Industrial Light & Magic nor the names of |
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// its contributors may be used to endorse or promote products derived |
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// from this software without specific prior written permission. |
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// |
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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// |
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/////////////////////////////////////////////////////////////////////////// |
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//----------------------------------------------------------------------------- |
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// |
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// Routines for converting between pixel data types, |
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// with well-defined behavior for exceptional cases. |
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// |
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//----------------------------------------------------------------------------- |
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#include <ImfConvert.h> |
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#include <limits.h> |
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namespace Imf { |
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namespace { |
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inline bool |
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isNegative (float f) |
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{ |
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union {float f; int i;} u; |
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u.f = f; |
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return (u.i & 0x80000000) != 0; |
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} |
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inline bool |
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isNan (float f) |
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{ |
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union {float f; int i;} u; |
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u.f = f; |
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return (u.i & 0x7fffffff) > 0x7f800000; |
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} |
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inline bool |
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isInfinity (float f) |
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{ |
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union {float f; int i;} u; |
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u.f = f; |
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return (u.i & 0x7fffffff) == 0x7f800000; |
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} |
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inline bool |
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isFinite (float f) |
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{ |
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union {float f; int i;} u; |
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u.f = f; |
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return (u.i & 0x7f800000) != 0x7f800000; |
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} |
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} // namespace |
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unsigned int |
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halfToUint (half h) |
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{ |
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if (h.isNegative() || h.isNan()) |
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return 0; |
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if (h.isInfinity()) |
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return UINT_MAX; |
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return (unsigned int) h; |
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} |
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unsigned int |
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floatToUint (float f) |
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{ |
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if (isNegative (f) || isNan (f)) |
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return 0; |
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if (isInfinity (f) || f > UINT_MAX) |
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return UINT_MAX; |
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return (unsigned int) f; |
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} |
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half |
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uintToHalf (unsigned int ui) |
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{ |
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if (ui > HALF_MAX) |
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return half::posInf(); |
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return half (ui); |
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} |
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half |
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floatToHalf (float f) |
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{ |
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if (isFinite (f)) |
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{ |
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if (f > HALF_MAX) |
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return half::posInf(); |
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if (f < -HALF_MAX) |
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return half::negInf(); |
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} |
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return half (f); |
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} |
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} // namespace Imf
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