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LASreadItemCompressed_WAVEPACKET13_v1.cs
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LASreadItemCompressed_WAVEPACKET13_v1.cs
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//===============================================================================
//
// FILE: lasreaditemcompressed_wavepacket13_v1.cs
//
// CONTENTS:
//
// Implementation of LASreadItemCompressed for WAVEPACKET13 items (version 1).
//
// PROGRAMMERS:
//
// martin.isenburg@rapidlasso.com - http://rapidlasso.com
//
// COPYRIGHT:
//
// (c) 2005-2012, martin isenburg, rapidlasso - tools to catch reality
// (c) of the C# port 2014 by Shinta <shintadono@googlemail.com>
//
// This is free software; you can redistribute and/or modify it under the
// terms of the GNU Lesser General Licence as published by the Free Software
// Foundation. See the COPYING file for more information.
//
// This software is distributed WITHOUT ANY WARRANTY and without even the
// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//
// CHANGE HISTORY: omitted for easier Copy&Paste (pls see the original)
//
//===============================================================================
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace laszip.net
{
class LASreadItemCompressed_WAVEPACKET13_v1 : LASreadItemCompressed
{
public LASreadItemCompressed_WAVEPACKET13_v1(ArithmeticDecoder dec)
{
// set decoder
Debug.Assert(dec!=null);
this.dec=dec;
// create models and integer compressors
m_packet_index=dec.createSymbolModel(256);
m_offset_diff[0]=dec.createSymbolModel(4);
m_offset_diff[1]=dec.createSymbolModel(4);
m_offset_diff[2]=dec.createSymbolModel(4);
m_offset_diff[3]=dec.createSymbolModel(4);
ic_offset_diff=new IntegerCompressor(dec, 32);
ic_packet_size=new IntegerCompressor(dec, 32);
ic_return_point=new IntegerCompressor(dec, 32);
ic_xyz=new IntegerCompressor(dec, 32, 3);
}
public unsafe override bool init(laszip_point item)
{
// init state
last_diff_32=0;
sym_last_offset_diff=0;
// init models and integer compressors
dec.initSymbolModel(m_packet_index);
dec.initSymbolModel(m_offset_diff[0]);
dec.initSymbolModel(m_offset_diff[1]);
dec.initSymbolModel(m_offset_diff[2]);
dec.initSymbolModel(m_offset_diff[3]);
ic_offset_diff.initDecompressor();
ic_packet_size.initDecompressor();
ic_return_point.initDecompressor();
ic_xyz.initDecompressor();
// init last item
fixed(byte* pItem=item.wave_packet)
{
last_item=*(LASwavepacket13*)(pItem+1);
}
return true;
}
public unsafe override void read(laszip_point item)
{
item.wave_packet[0]=(byte)(dec.decodeSymbol(m_packet_index));
fixed(byte* pItem=item.wave_packet)
{
LASwavepacket13* wave=(LASwavepacket13*)(pItem+1);
sym_last_offset_diff=dec.decodeSymbol(m_offset_diff[sym_last_offset_diff]);
if(sym_last_offset_diff==0)
{
wave->offset=last_item.offset;
}
else if(sym_last_offset_diff==1)
{
wave->offset=last_item.offset+last_item.packet_size;
}
else if(sym_last_offset_diff==2)
{
last_diff_32=ic_offset_diff.decompress(last_diff_32);
wave->offset=(ulong)((long)last_item.offset+last_diff_32);
}
else
{
wave->offset=dec.readInt64();
}
wave->packet_size=(uint)ic_packet_size.decompress((int)last_item.packet_size);
wave->return_point.i32=ic_return_point.decompress(last_item.return_point.i32);
wave->x.i32=ic_xyz.decompress(last_item.x.i32, 0);
wave->y.i32=ic_xyz.decompress(last_item.y.i32, 1);
wave->z.i32=ic_xyz.decompress(last_item.z.i32, 2);
last_item=*wave;
}
}
ArithmeticDecoder dec;
LASwavepacket13 last_item;
int last_diff_32;
uint sym_last_offset_diff;
ArithmeticModel m_packet_index;
ArithmeticModel[] m_offset_diff=new ArithmeticModel[4];
IntegerCompressor ic_offset_diff;
IntegerCompressor ic_packet_size;
IntegerCompressor ic_return_point;
IntegerCompressor ic_xyz;
}
}