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LASreadItemCompressed_RGB12_v2.cs
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LASreadItemCompressed_RGB12_v2.cs
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//===============================================================================
//
// FILE: lasreaditemcompressed_rgb12_v2.cs
//
// CONTENTS:
//
// Implementation of LASreadItemCompressed for RGB12 items (version 2).
//
// 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;
using System.Diagnostics;
namespace laszip.net
{
class LASreadItemCompressed_RGB12_v2 : LASreadItemCompressed
{
public LASreadItemCompressed_RGB12_v2(ArithmeticDecoder dec)
{
// set decoder
Debug.Assert(dec!=null);
this.dec=dec;
// create models and integer compressors
m_byte_used=dec.createSymbolModel(128);
m_rgb_diff_0=dec.createSymbolModel(256);
m_rgb_diff_1=dec.createSymbolModel(256);
m_rgb_diff_2=dec.createSymbolModel(256);
m_rgb_diff_3=dec.createSymbolModel(256);
m_rgb_diff_4=dec.createSymbolModel(256);
m_rgb_diff_5=dec.createSymbolModel(256);
}
public override bool init(laszip_point item)
{
// init state
// init models and integer compressors
dec.initSymbolModel(m_byte_used);
dec.initSymbolModel(m_rgb_diff_0);
dec.initSymbolModel(m_rgb_diff_1);
dec.initSymbolModel(m_rgb_diff_2);
dec.initSymbolModel(m_rgb_diff_3);
dec.initSymbolModel(m_rgb_diff_4);
dec.initSymbolModel(m_rgb_diff_5);
// init last item
Buffer.BlockCopy(item.rgb, 0, last_item, 0, 6);
return true;
}
public override void read(laszip_point item)
{
int corr;
int diff=0;
uint sym=dec.decodeSymbol(m_byte_used);
if((sym&(1<<0))!=0)
{
corr=(int)dec.decodeSymbol(m_rgb_diff_0);
item.rgb[0]=(ushort)MyDefs.U8_FOLD(corr+(last_item[0]&255));
}
else
{
item.rgb[0]=(ushort)(last_item[0]&0xFF);
}
if((sym&(1<<1))!=0)
{
corr=(int)dec.decodeSymbol(m_rgb_diff_1);
item.rgb[0]|=(ushort)((MyDefs.U8_FOLD(corr+(last_item[0]>>8)))<<8);
}
else
{
item.rgb[0]|=(ushort)(last_item[0]&0xFF00);
}
if((sym&(1<<6))!=0)
{
diff=(item.rgb[0]&0x00FF)-(last_item[0]&0x00FF);
if((sym&(1<<2))!=0)
{
corr=(int)dec.decodeSymbol(m_rgb_diff_2);
item.rgb[1]=(ushort)MyDefs.U8_FOLD(corr+MyDefs.U8_CLAMP(diff+(last_item[1]&255)));
}
else
{
item.rgb[1]=(ushort)(last_item[1]&0xFF);
}
if((sym&(1<<4))!=0)
{
corr=(int)dec.decodeSymbol(m_rgb_diff_4);
diff=(diff+((item.rgb[1]&0x00FF)-(last_item[1]&0x00FF)))/2;
item.rgb[2]=(ushort)MyDefs.U8_FOLD(corr+MyDefs.U8_CLAMP(diff+(last_item[2]&255)));
}
else
{
item.rgb[2]=(ushort)(last_item[2]&0xFF);
}
diff=(item.rgb[0]>>8)-(last_item[0]>>8);
if((sym&(1<<3))!=0)
{
corr=(int)dec.decodeSymbol(m_rgb_diff_3);
item.rgb[1]|=(ushort)((MyDefs.U8_FOLD(corr+MyDefs.U8_CLAMP(diff+(last_item[1]>>8))))<<8);
}
else
{
item.rgb[1]|=(ushort)(last_item[1]&0xFF00);
}
if((sym&(1<<5))!=0)
{
corr=(int)dec.decodeSymbol(m_rgb_diff_5);
diff=(diff+((item.rgb[1]>>8)-(last_item[1]>>8)))/2;
item.rgb[2]|=(ushort)((MyDefs.U8_FOLD(corr+MyDefs.U8_CLAMP(diff+(last_item[2]>>8))))<<8);
}
else
{
item.rgb[2]|=(ushort)(last_item[2]&0xFF00);
}
}
else
{
item.rgb[1]=item.rgb[0];
item.rgb[2]=item.rgb[0];
}
last_item[0]=item.rgb[0];
last_item[1]=item.rgb[1];
last_item[2]=item.rgb[2];
}
ArithmeticDecoder dec;
ushort[] last_item=new ushort[3];
ArithmeticModel m_byte_used;
ArithmeticModel m_rgb_diff_0;
ArithmeticModel m_rgb_diff_1;
ArithmeticModel m_rgb_diff_2;
ArithmeticModel m_rgb_diff_3;
ArithmeticModel m_rgb_diff_4;
ArithmeticModel m_rgb_diff_5;
}
}