mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-14 21:59:17 +00:00
91 lines
2.0 KiB
C++
91 lines
2.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
|
|
*
|
|
* ScummVM is the legal property of its developers, whose names
|
|
* are too numerous to list here. Please refer to the COPYRIGHT
|
|
* file distributed with this source distribution.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
*/
|
|
|
|
// Based on eos' (I)RDFT code which is in turn
|
|
// Based upon the (I)DCT code in FFmpeg
|
|
// Copyright (c) 2009 Peter Ross <pross@xvid.org>
|
|
// Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
|
|
// Copyright (c) 2010 Vitor Sessak
|
|
|
|
#ifndef COMMON_DCT_H
|
|
#define COMMON_DCT_H
|
|
|
|
#include "common/scummsys.h"
|
|
#include "common/math.h"
|
|
#include "common/rdft.h"
|
|
|
|
#include "common/cosinetables.h"
|
|
|
|
namespace Common {
|
|
|
|
/**
|
|
* @defgroup common_dct Discrete Cosine Transforms
|
|
* @ingroup common
|
|
*
|
|
* @brief Discrete Cosine Transforms.
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* (Inverse) Discrete Cosine Transforms.
|
|
*
|
|
* Used in engines:
|
|
* - Scumm
|
|
*/
|
|
class DCT {
|
|
public:
|
|
enum TransformType {
|
|
DCT_II,
|
|
DCT_III,
|
|
DCT_I,
|
|
DST_I
|
|
};
|
|
|
|
DCT(int bits, TransformType trans);
|
|
~DCT();
|
|
|
|
void calc(float *data);
|
|
|
|
private:
|
|
int _bits;
|
|
TransformType _trans;
|
|
|
|
CosineTable _cos;
|
|
const float *_tCos;
|
|
|
|
float *_csc2;
|
|
|
|
RDFT *_rdft;
|
|
|
|
void calcDCTI (float *data);
|
|
void calcDCTII (float *data);
|
|
void calcDCTIII(float *data);
|
|
void calcDSTI (float *data);
|
|
};
|
|
|
|
/** @} */
|
|
|
|
} // End of namespace Common
|
|
|
|
#endif // COMMON_DCT_H
|