rcdefs.h

SFC游戏模拟器 snes9x 1.43 的原代码

/*
Copyright (C) 2002 Andrea Mazzoleni ( http://advancemame.sf.net )
Copyright (C) 2001-4 Igor Pavlov ( http://www.7-zip.org )

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef __RCDEFS_H
#define __RCDEFS_H

#include "aribitcd.h"
#include "ariconst.h"

#define RC_INIT_VAR                            \
  UINT32 aRange = aRangeDecoder->m_Range;      \
  UINT32 aCode = aRangeDecoder->m_Code;        

#define RC_FLUSH_VAR                          \
  aRangeDecoder->m_Range = aRange;            \
  aRangeDecoder->m_Code = aCode;

#define RC_NORMALIZE                                    \
    if (aRange < NCompression::NArithmetic::kTopValue)               \
    {                                                              \
      aCode = (aCode << 8) | aRangeDecoder->m_Stream.ReadByte();   \
      aRange <<= 8; }

#define RC_GETBIT2(aNumMoveBits, aProb, aModelIndex, Action0, Action1)                        \
    {UINT32 aNewBound = (aRange >> NCompression::NArithmetic::kNumBitModelTotalBits) * aProb; \
    if (aCode < aNewBound)                               \
    {                                                             \
      Action0;                                                    \
      aRange = aNewBound;                                         \
      aProb += (NCompression::NArithmetic::kBitModelTotal - aProb) >> aNumMoveBits;          \
      aModelIndex <<= 1;                                          \
    }                                                             \
    else                                                          \
    {                                                             \
      Action1;                                                    \
      aRange -= aNewBound;                                        \
      aCode -= aNewBound;                                          \
      aProb -= (aProb) >> aNumMoveBits;                           \
      aModelIndex = (aModelIndex << 1) + 1;                       \
    }}                                                             \
    RC_NORMALIZE

#define RC_GETBIT(aNumMoveBits, aProb, aModelIndex) RC_GETBIT2(aNumMoveBits, aProb, aModelIndex, ; , ;)               

#endif