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https://github.com/libretro/scummvm.git
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88 lines
1.8 KiB
C++
88 lines
1.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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// Based on eos' (I)RDFT code which is in turn
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// Based upon the (I)DCT code in FFmpeg
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// Copyright (c) 2009 Peter Ross <pross@xvid.org>
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// Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
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// Copyright (c) 2010 Vitor Sessak
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#ifndef MATH_DCT_H
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#define MATH_DCT_H
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#include "math/cosinetables.h"
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namespace Math {
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class RDFT;
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/**
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* @defgroup math_dct Discrete Cosine Transforms
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* @ingroup math
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*
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* @brief Discrete Cosine Transforms.
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*
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* @{
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*/
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/**
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* (Inverse) Discrete Cosine Transforms.
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*
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* Used in engines:
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* - Scumm
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*/
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class DCT {
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public:
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enum TransformType {
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DCT_II,
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DCT_III,
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DCT_I,
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DST_I
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};
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DCT(int bits, TransformType trans);
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~DCT();
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void calc(float *data);
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private:
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int _bits;
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TransformType _trans;
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CosineTable _cos;
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const float *_tCos;
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float *_csc2;
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RDFT *_rdft;
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void calcDCTI (float *data);
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void calcDCTII (float *data);
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void calcDCTIII(float *data);
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void calcDSTI (float *data);
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};
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/** @} */
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} // End of namespace Math
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#endif // MATH_DCT_H
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