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LASreadItemCompressed_POINT10_v2.cs
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LASreadItemCompressed_POINT10_v2.cs
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//===============================================================================
//
// FILE: lasreaditemcompressed_point10_v2.cs
//
// CONTENTS:
//
// Implementation of LASreadItemCompressed for POINT10 items (version 2).
//
// PROGRAMMERS:
//
// [email protected] - http://rapidlasso.com
//
// COPYRIGHT:
//
// (c) 2005-2012, martin isenburg, rapidlasso - tools to catch reality
// (c) of the C# port 2014 by Shinta <[email protected]>
//
// 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_POINT10_v2 : LASreadItemCompressed
{
[StructLayout(LayoutKind.Sequential, Pack=1)]
struct LASpoint10
{
public int x;
public int y;
public int z;
public ushort intensity;
// all these bits combine to flags
//public byte return_number : 3;
//public byte number_of_returns_of_given_pulse : 3;
//public byte scan_direction_flag : 1;
//public byte edge_of_flight_line : 1;
public byte flags;
public byte classification;
public sbyte scan_angle_rank;
public byte user_data;
public ushort point_source_ID;
}
public LASreadItemCompressed_POINT10_v2(ArithmeticDecoder dec)
{
// set decoder
Debug.Assert(dec!=null);
this.dec=dec;
// create models and integer compressors
ic_dx=new IntegerCompressor(dec, 32, 2); // 32 bits, 2 context
ic_dy=new IntegerCompressor(dec, 32, 22); // 32 bits, 22 contexts
ic_z=new IntegerCompressor(dec, 32, 20); // 32 bits, 20 contexts
ic_intensity=new IntegerCompressor(dec, 16, 4);
m_scan_angle_rank[0]=dec.createSymbolModel(256);
m_scan_angle_rank[1]=dec.createSymbolModel(256);
ic_point_source_ID=new IntegerCompressor(dec, 16);
m_changed_values=dec.createSymbolModel(64);
for(int i=0; i<256; i++)
{
m_bit_byte[i]=null;
m_classification[i]=null;
m_user_data[i]=null;
}
}
public override bool init(laszip_point item)
{
// init state
for(int i=0; i<16; i++)
{
last_x_diff_median5[i].init();
last_y_diff_median5[i].init();
last_intensity[i]=0;
last_height[i/2]=0;
}
// init models and integer compressors
ic_dx.initDecompressor();
ic_dy.initDecompressor();
ic_z.initDecompressor();
ic_intensity.initDecompressor();
dec.initSymbolModel(m_scan_angle_rank[0]);
dec.initSymbolModel(m_scan_angle_rank[1]);
ic_point_source_ID.initDecompressor();
dec.initSymbolModel(m_changed_values);
for(int i=0; i<256; i++)
{
if(m_bit_byte[i]!=null) dec.initSymbolModel(m_bit_byte[i]);
if(m_classification[i]!=null) dec.initSymbolModel(m_classification[i]);
if(m_user_data[i]!=null) dec.initSymbolModel(m_user_data[i]);
}
// init last item
last.x=item.X;
last.y=item.Y;
last.z=item.Z;
last.intensity=0; // but set intensity to zero
last.flags=item.flags;
last.classification=item.classification;
last.scan_angle_rank=item.scan_angle_rank;
last.user_data=item.user_data;
last.point_source_ID=item.point_source_ID;
return true;
}
public override void read(laszip_point item)
{
// decompress which other values have changed
uint changed_values=dec.decodeSymbol(m_changed_values);
byte r, n, m, l;
if(changed_values!=0)
{
// decompress the edge_of_flight_line, scan_direction_flag, ... if it has changed
if((changed_values&32)!=0)
{
if(m_bit_byte[last.flags]==null)
{
m_bit_byte[last.flags]=dec.createSymbolModel(256);
dec.initSymbolModel(m_bit_byte[last.flags]);
}
last.flags=(byte)dec.decodeSymbol(m_bit_byte[last.flags]);
}
r=(byte)(last.flags&0x7); // return_number
n=(byte)((last.flags>>3)&0x7); // number_of_returns_of_given_pulse
m=Laszip_Common_v2.number_return_map[n, r];
l=Laszip_Common_v2.number_return_level[n, r];
// decompress the intensity if it has changed
if((changed_values&16)!=0)
{
last.intensity=(ushort)ic_intensity.decompress(last_intensity[m], (m<3?m:3u));
last_intensity[m]=last.intensity;
}
else
{
last.intensity=last_intensity[m];
}
// decompress the classification ... if it has changed
if((changed_values&8)!=0)
{
if(m_classification[last.classification]==null)
{
m_classification[last.classification]=dec.createSymbolModel(256);
dec.initSymbolModel(m_classification[last.classification]);
}
last.classification=(byte)dec.decodeSymbol(m_classification[last.classification]);
}
// decompress the scan_angle_rank ... if it has changed
if((changed_values&4)!=0)
{
int val=(int)dec.decodeSymbol(m_scan_angle_rank[(last.flags&0x40)!=0?1:0]); // scan_direction_flag
//last->scan_angle_rank=(sbyte)MyDefs.U8_FOLD(val+(byte)last->scan_angle_rank);
last.scan_angle_rank=(sbyte)((val+(byte)last.scan_angle_rank)%256);
}
// decompress the user_data ... if it has changed
if((changed_values&2)!=0)
{
if(m_user_data[last.user_data]==null)
{
m_user_data[last.user_data]=dec.createSymbolModel(256);
dec.initSymbolModel(m_user_data[last.user_data]);
}
last.user_data=(byte)dec.decodeSymbol(m_user_data[last.user_data]);
}
// decompress the point_source_ID ... if it has changed
if((changed_values&1)!=0)
{
last.point_source_ID=(ushort)ic_point_source_ID.decompress(last.point_source_ID);
}
}
else
{
r=(byte)(last.flags&0x7); // return_number
n=(byte)((last.flags>>3)&0x7); // number_of_returns_of_given_pulse
m=Laszip_Common_v2.number_return_map[n, r];
l=Laszip_Common_v2.number_return_level[n, r];
}
// decompress x coordinate
int median=last_x_diff_median5[m].get();
int diff=ic_dx.decompress(median, n==1?1u:0u);
last.x+=diff;
last_x_diff_median5[m].add(diff);
// decompress y coordinate
median=last_y_diff_median5[m].get();
uint k_bits=ic_dx.getK();
diff=ic_dy.decompress(median, (n==1?1u:0u)+(k_bits<20?k_bits&0xFEu:20u)); // &0xFE round k_bits to next even number
last.y+=diff;
last_y_diff_median5[m].add(diff);
// decompress z coordinate
k_bits=(ic_dx.getK()+ic_dy.getK())/2;
last.z=ic_z.decompress(last_height[l], (n==1?1u:0u)+(k_bits<18?k_bits&0xFEu:18u)); // &0xFE round k_bits to next even number
last_height[l]=last.z;
// copy the last point
item.X=last.x;
item.Y=last.y;
item.Z=last.z;
item.intensity=last.intensity;
item.flags=last.flags;
item.classification=last.classification;
item.scan_angle_rank=last.scan_angle_rank;
item.user_data=last.user_data;
item.point_source_ID=last.point_source_ID;
}
ArithmeticDecoder dec;
LASpoint10 last=new LASpoint10();
ushort[] last_intensity=new ushort[16];
StreamingMedian5[] last_x_diff_median5=new StreamingMedian5[16];
StreamingMedian5[] last_y_diff_median5=new StreamingMedian5[16];
int[] last_height=new int[8];
IntegerCompressor ic_dx;
IntegerCompressor ic_dy;
IntegerCompressor ic_z;
IntegerCompressor ic_intensity;
IntegerCompressor ic_point_source_ID;
ArithmeticModel m_changed_values;
ArithmeticModel[] m_scan_angle_rank=new ArithmeticModel[2];
ArithmeticModel[] m_bit_byte=new ArithmeticModel[256];
ArithmeticModel[] m_classification=new ArithmeticModel[256];
ArithmeticModel[] m_user_data=new ArithmeticModel[256];
}
}