晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// 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
// its contributors 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 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////


#ifndef INCLUDED_IMF_B44_COMPRESSOR_H
#define INCLUDED_IMF_B44_COMPRESSOR_H

//-----------------------------------------------------------------------------
//
//	class B44Compressor -- lossy compression of 4x4 pixel blocks
//
//-----------------------------------------------------------------------------

#include "ImfCompressor.h"
#include "ImfNamespace.h"
#include "ImfExport.h"
#include "ImfForward.h"

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER


class IMF_EXPORT B44Compressor: public Compressor
{
  public:

    B44Compressor (const Header &hdr,
                   size_t maxScanLineSize,
		   size_t numScanLines,
		   bool optFlatFields);

    virtual ~B44Compressor ();

    virtual int		numScanLines () const;

    virtual Format	format () const;

    virtual int		compress (const char *inPtr,
				  int inSize,
				  int minY,
				  const char *&outPtr);                  
                  
    virtual int		compressTile (const char *inPtr,
				      int inSize,
				      IMATH_NAMESPACE::Box2i range,
				      const char *&outPtr);

    virtual int		uncompress (const char *inPtr,
				    int inSize,
				    int minY,
				    const char *&outPtr);
                    
    virtual int		uncompressTile (const char *inPtr,
					int inSize,
					IMATH_NAMESPACE::Box2i range,
					const char *&outPtr);
  private:

    struct ChannelData;
    
    int			compress (const char *inPtr,
				  int inSize,
				  IMATH_NAMESPACE::Box2i range,
				  const char *&outPtr);
 
    int			uncompress (const char *inPtr,
				    int inSize,
				    IMATH_NAMESPACE::Box2i range,
				    const char *&outPtr);

    int			_maxScanLineSize;
    bool		_optFlatFields;
    Format		_format;
    int			_numScanLines;
    unsigned short *	_tmpBuffer;
    char *		_outBuffer;
    int			_numChans;
    const ChannelList &	_channels;
    ChannelData *	_channelData;
    int			_minX;
    int			_maxX;
    int			_maxY;
};


OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif

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