meshR.h

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/* This software and supporting documentation are distributed by
 *     Institut Federatif de Recherche 49
 *     CEA/NeuroSpin, Batiment 145,
 *     91191 Gif-sur-Yvette cedex
 *     France
 *
 * This software is governed by the CeCILL-B license under
 * French law and abiding by the rules of distribution of free software.
 * You can  use, modify and/or redistribute the software under the
 * terms of the CeCILL-B license as circulated by CEA, CNRS
 * and INRIA at the following URL "http://www.cecill.info".
 *
 * As a counterpart to the access to the source code and  rights to copy,
 * modify and redistribute granted by the license, users are provided only
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 * economic rights,  and the successive licensors  have only  limited
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 */
 
/*
 *  Surface reader class
 */
#ifndef AIMS_IO_MESHR_H
#define AIMS_IO_MESHR_H
 
#include <aims/config/aimsdata_config.h>
#include <aims/io/defaultItemR.h>
#include <aims/io/meshheader.h>
#include <cartobase/exception/ioexcept.h>
 
 
namespace aims
{

  template<int D, class T=Void>
  class MeshReader
  {
  public:
    MeshReader( const std::string & name, ItemReader<T> *ir = 0 ) 
      : _name( name ), _itemr( ir ) { }
    ~MeshReader() { delete _itemr; }
 
    inline void read( AimsTimeSurface<D,T>& thing, int frame = -1 );

    inline std::string removeExtension(const std::string& name);
    void setItemReader( ItemReader<T>* ir )
      { delete _itemr; _itemr = ir; }
 
  private:
    std::string         _name;
    ItemReader<T>  *_itemr;
  };
 
 
  template <int D, class T>
  inline 
  AIMSDATA_API MeshReader<D,T> &
  operator >> ( MeshReader<D,T> & reader, AimsTimeSurface<D,T> & thing )
  {
    reader.read( thing );
    return reader;
  }
 
 
  template <int D, class T> inline 
  std::string MeshReader<D,T>::removeExtension( const std::string& name )
  {
    std::string res = name;
    std::string ext="";
    if ( res.length() > 5 )
      ext = res.substr( int(res.length() - 5), 5 );
    if ( ext == ".mesh" )
      res = res.substr( 0, res.length() - 5 );
    return res;
  }
 
 
  template <int D, class T> inline
  void 
  MeshReader<D,T>::read( AimsTimeSurface<D,T> & thing, int frame )
  {
    if ( frame >= 0 )
      std::cerr << "Warning : .mesh single frame reading not implemented yet " 
                << "-\nreading whole mesh\n";
 
    MeshHeader        hdr( _name );
    uint32_t    buf;
    if ( !hdr.read( &buf ) )
      carto::io_error::launchErrnoExcept( hdr.filename() );
    int polydim = D;
    hdr.getProperty( "polygon_dimension", polydim );
    if( polydim != D )
    {
      std::stringstream msg;
      msg << "Wrong polygon dimension, " << polydim << ", should be " << D 
        << ".";
      throw carto::datatype_format_error( msg.str(), hdr.filename() );
    }
    std::ifstream::off_type offset = buf; // ## does not support large files!
 
    std::ios::openmode  omd = std::ios::in;
    if ( hdr.openMode() == "binar" )
      omd |= std::ios::binary;
    std::ifstream       is( hdr.filename().c_str(), omd );
    is.unsetf( std::ios::skipws );
    if ( !is )
      carto::io_error::launchErrnoExcept( hdr.filename() );
    is.seekg( offset );
    if ( !is )
      carto::io_error::launchErrnoExcept( hdr.filename() );
 
    if ( hdr.openMode() == "ascii" )
      is.setf( std::ios::skipws );
    thing.erase();
    if ( !_itemr )
      _itemr = new DefaultItemReader<T>;
    ItemReader<T>          *ir 
      = _itemr->reader( hdr.openMode(), hdr.byteSwapping() );
    DefaultItemReader<uint32_t>      sr1;
    ItemReader<uint32_t>    *sr = sr1.reader( hdr.openMode(), 
                                          hdr.byteSwapping() );
    DefaultItemReader<Point3df>      pr1;
    ItemReader<Point3df>    *pr = pr1.reader( hdr.openMode(), 
                                                  hdr.byteSwapping() );
    DefaultItemReader<AimsVector<uint,D> >  plr1;
    ItemReader<AimsVector<uint,D> >                *plr 
      = plr1.reader( hdr.openMode(), hdr.byteSwapping() );
 
    int size = 0;
    hdr.getProperty( "nb_t_pos", size );
    bool        broken = false;
    typename std::vector<AimsVector<uint,D> >::iterator       ip;
 
    thing.setHeader( hdr );
 
    uint32_t time, nvertex, nnormal, ntexture, npolygon;
    for ( int t=0; t<size; ++t )
      {
        // time
        sr->read( is, time );
 
        // vertices
        sr->read( is, nvertex );
 
        AimsSurface<D,T>        & surf = thing[ time ];
 
        std::vector<Point3df>   & vert = surf.vertex();
        vert.insert( vert.end(), nvertex, Point3df() );
        pr->read( is, &vert[0], nvertex );
 
        // normals
        sr->read( is, nnormal );
        std::vector<Point3df>   & norm = surf.normal();
        norm.insert( norm.end(), nnormal, Point3df() );
        pr->read( is, &norm[0], nnormal );
 
        // textures
        sr->read( is, ntexture );
        std::vector<T>  & tex = surf.texture();
        tex.insert( tex.end(), ntexture, T() );
        ir->read( is, &tex[0], ntexture );
 
        // polygons
        sr->read( is, npolygon );
        std::vector<AimsVector<uint,D> >  & poly = surf.polygon();
        poly.insert( poly.end(), npolygon, AimsVector<uint,D>() );
        plr->read( is, &poly[0], npolygon );
 
        // verify polygons are all in the vertices range
        for ( ip=poly.begin(); ip!=poly.end(); ++ip )
          {
            AimsVector<uint,D>        & pol = *ip;
            for ( int j=0; j<D; ++j )
              if ( pol[j] >= nvertex )
                {
                  if ( !broken )
                    {
                      broken = true;
                      std::cerr << "Broken mesh: polygon pointing to a " 
                                << "vertex out of range" << std::endl;
                    }
                  poly.erase( ip );
                  --ip;
                  break;
                }
          }
 
        if ( norm.size() != vert.size() )
          surf.updateNormals();
      }
 
    delete plr;
    delete pr;
    delete sr;
    delete ir;
  }
 
}
 
 
#endif