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cs440-acg/ext/openexr/OpenEXR/IlmImfTest/compareFloat.cpp

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