69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
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//////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2004, Industrial Light & Magic, a division of Lucasfilm
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// Entertainment Company Ltd. Portions contributed and copyright held by
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// others as indicated. 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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//
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// * Redistributions of source code must retain the above
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// copyright notice, this list of conditions and the following
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// disclaimer.
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//
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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
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// disclaimer in the documentation and/or other materials provided with
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// the distribution.
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//
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// * Neither the name of Industrial Light & Magic nor the names of
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// any other contributors to this software may be used to endorse or
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// promote products derived from this software without specific prior
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// written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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//////////////////////////////////////////////////////////////////////////////
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#include "compareFloat.h"
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using namespace OPENEXR_IMF_NAMESPACE;
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bool
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equivalent (float f1, float f2, Compression comp)
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{
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//
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// Test if a float, f1, is "equivalent" to another float, f2,
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// which results from storing f1 in an image file, and reading
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// it back:
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// If the file was compressed with PXR24_COMPRESSION, then f1
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// and f2 must the same as f1 rounded to 24 bits (see class
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// ImfPxr24Compressor); otherwise f1 and f2 must be the same.
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//
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union
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{
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float f;
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unsigned int i;
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} u1, u2;
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u1.f = f1;
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u2.f = f2;
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if (comp == PXR24_COMPRESSION)
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return (u2.i >> 8) - (u1.i >> 8) < 2;
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else
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return u2.i == u1.i;
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}
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