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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2007 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
// $Id$
#include "gdal_datasource.hpp"
#include "gdal_featureset.hpp"
// mapnik
#include <mapnik/ptree_helpers.hpp>
#include <mapnik/geom_util.hpp>
using mapnik::datasource;
using mapnik::parameters;
DATASOURCE_PLUGIN(gdal_datasource)
using mapnik::box2d;
using mapnik::coord2d;
using mapnik::query;
using mapnik::featureset_ptr;
using mapnik::layer_descriptor;
using mapnik::datasource_exception;
/*
* Opens a GDALDataset and returns a pointer to it.
* Caller is responsible for calling GDALClose on it
*/
inline GDALDataset *gdal_datasource::open_dataset() const
{
#ifdef MAPNIK_DEBUG
std::clog << "GDAL Plugin: opening: " << dataset_name_ << std::endl;
#endif
GDALDataset *dataset;
#if GDAL_VERSION_NUM >= 1600
if (shared_dataset_)
dataset = reinterpret_cast<GDALDataset*>(GDALOpenShared((dataset_name_).c_str(),GA_ReadOnly));
else
#endif
dataset = reinterpret_cast<GDALDataset*>(GDALOpen((dataset_name_).c_str(),GA_ReadOnly));
if (! dataset) throw datasource_exception(CPLGetLastErrorMsg());
return dataset;
}
gdal_datasource::gdal_datasource(parameters const& params, bool bind)
: datasource(params),
desc_(*params.get<std::string>("type"),"utf-8"),
filter_factor_(*params_.get<double>("filter_factor",0.0))
{
#ifdef MAPNIK_DEBUG
std::clog << "GDAL Plugin: Initializing..." << std::endl;
#endif
GDALAllRegister();
boost::optional<std::string> file = params.get<std::string>("file");
if (!file) throw datasource_exception("missing <file> parameter");
boost::optional<std::string> base = params_.get<std::string>("base");
if (base)
dataset_name_ = *base + "/" + *file;
else
dataset_name_ = *file;
if (bind)
{
this->bind();
}
}
void gdal_datasource::bind() const
{
if (is_bound_) return;
shared_dataset_ = *params_.get<mapnik::boolean>("shared",false);
band_ = *params_.get<int>("band", -1);
GDALDataset *dataset = open_dataset();
nbands_ = dataset->GetRasterCount();
width_ = dataset->GetRasterXSize();
height_ = dataset->GetRasterYSize();
double tr[6];
bool bbox_override = false;
boost::optional<std::string> bbox_s = params_.get<std::string>("bbox");
if (bbox_s)
{
#ifdef MAPNIK_DEBUG
std::clog << "GDAL Plugin: bbox parameter=" << *bbox_s << std::endl;
#endif
bbox_override = extent_.from_string(*bbox_s);
if (!bbox_override)
{
throw datasource_exception("GDAL Plugin: bbox parameter '" + *bbox_s + "' invalid");
}
}
if (bbox_override)
{
tr[0] = extent_.minx();
tr[1] = extent_.width() / (double)width_;
tr[2] = 0;
tr[3] = extent_.maxy();
tr[4] = 0;
tr[5] = -extent_.height() / (double)height_;
}
else
{
dataset->GetGeoTransform(tr);
}
#ifdef MAPNIK_DEBUG
std::clog << "GDAL Plugin: geotransform=" << tr[0] << "," << tr[1] << ","
<< tr[2] << "," << tr[3] << ","
<< tr[4] << "," << tr[5] << std::endl;
#endif
if (tr[2] !=0 || tr[4] != 0)
{
throw datasource_exception("GDAL Plugin: only 'north up' images are supported");
}
dx_ = tr[1];
dy_ = tr[5];
if (!bbox_override)
{
double x0 = tr[0];
double y0 = tr[3];
double x1 = tr[0] + width_ * dx_ + height_ *tr[2];
double y1 = tr[3] + width_ *tr[4] + height_ * dy_;
/*
double x0 = tr[0] + (height_) * tr[2]; // minx
double y0 = tr[3] + (height_) * tr[5]; // miny
double x1 = tr[0] + (width_) * tr[1]; // maxx
double y1 = tr[3] + (width_) * tr[4]; // maxy
*/
extent_.init(x0,y0,x1,y1);
}
GDALClose(dataset);
#ifdef MAPNIK_DEBUG
std::clog << "GDAL Plugin: Raster Size=" << width_ << "," << height_ << std::endl;
std::clog << "GDAL Plugin: Raster Extent=" << extent_ << std::endl;
#endif
is_bound_ = true;
}
gdal_datasource::~gdal_datasource()
{
}
int gdal_datasource::type() const
{
return datasource::Raster;
}
std::string gdal_datasource::name()
{
return "gdal";
}
box2d<double> gdal_datasource::envelope() const
{
if (!is_bound_) bind();
return extent_;
}
layer_descriptor gdal_datasource::get_descriptor() const
{
return desc_;
}
featureset_ptr gdal_datasource::features(query const& q) const
{
if (!is_bound_) bind();
gdal_query gq = q;
// TODO - move to boost::make_shared, but must reduce # of args to <= 9
return featureset_ptr(new gdal_featureset(*open_dataset(), band_, gq, extent_, width_, height_, nbands_, dx_, dy_, filter_factor_));
}
featureset_ptr gdal_datasource::features_at_point(coord2d const& pt) const
{
if (!is_bound_) bind();
gdal_query gq = pt;
return featureset_ptr(new gdal_featureset(*open_dataset(), band_, gq, extent_, width_, height_, nbands_, dx_, dy_, filter_factor_));
}
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