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* Copyright (C) 1994-1996, Thomas G. Lane.
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* Copyright (C) 1999-2006, MIYASAKA Masaru.
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* Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
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* Copyright (C) 2011 D. R. Commander
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* For conditions of distribution and use, see the accompanying README file.
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* This file contains the forward-DCT management logic.