tile_set.cpp

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#include <multires_image/tile_set.h>
 
// C++ standard libraries
#include <cmath>
#include <cstdlib>
#include <algorithm>
 
// QT libraries
#include <QFile>
#include <QFileInfo>
#include <QDir>
#include <QString>
 
namespace multires_image
{
  TileSet::TileSet(const std::string& geofile) :
    m_geo(geofile),
    m_extension("jpg")
  {
  }
 
  TileSet::TileSet(const std::string& geofile, const std::string extension) :
    m_geo(geofile),
    m_extension(extension)
  {
  }
 
  TileSet::TileSet(const swri_transform_util::GeoReference& georeference) :
    m_geo(georeference),
    m_extension("jpg")
  {
  }
 
  TileSet::TileSet(const swri_transform_util::GeoReference& georeference,
                   const std::string extension) :
    m_geo(georeference),
    m_extension(extension)
  {
  }
 
  TileSet::~TileSet(void)
  {
    // Free each of the layers.
    for (unsigned int i = 0; i < m_layers.size(); i++)
    {
      delete m_layers[i];
    }
  }
 
  bool TileSet::Load()
  {
    if (!m_geo.Load())
    {
      return false;
    }
 
    m_cacheDir = m_geo.Path();
    m_width = m_geo.Width();
    m_height = m_geo.Height();
    m_tileSize = m_geo.TileSize();
    m_extension = m_geo.Extension();
 
    float max_dim = std::max(m_width, m_height);
    m_layerCount = std::ceil(std::log(max_dim / m_tileSize) / std::log(2.0f)) + 1;
    m_layers.reserve(m_layerCount);
 
    // Check if the cache directory for this image exists.
    QDir directory(m_cacheDir.c_str());
    if (!directory.exists())
    {
      return false;
    }
 
    // Load each layer.
    for (int i = 0; i < m_layerCount; i++)
    {
      QString layerNum = QString::number(i);
 
      // Check if this layer exists in the cache.
      QDir layerDir(directory.absolutePath() + "/layer" + layerNum);
      if (!layerDir.exists(layerDir.absolutePath()))
      {
        return false;
      }
 
      // Load the base layer.
      m_layers.push_back(new TileSetLayer(m_geo, layerDir.absolutePath().toStdString(), m_tileSize, i));
 
      if (!m_layers[i]->Load(m_extension))
        return false;
    }
 
    return true;
  }
}