//////////////////////////////////////////////////////////////////////////////

//

// 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

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// 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;

}