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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2025 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
*
*****************************************************************************/
// boost
// mapnik
#include <mapnik/util/fs.hpp>
#include <mapnik/debug.hpp>
#include <mapnik/view_transform.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/image_reader.hpp>
#include <mapnik/boolean.hpp>
#include "raster_featureset.hpp"
#include "raster_info.hpp"
#include "raster_datasource.hpp"
using mapnik::coord2d;
using mapnik::datasource;
using mapnik::datasource_exception;
using mapnik::featureset_ptr;
using mapnik::image_reader;
using mapnik::layer_descriptor;
using mapnik::parameters;
using mapnik::query;
DATASOURCE_PLUGIN_IMPL(raster_datasource_plugin, raster_datasource);
DATASOURCE_PLUGIN_EXPORT(raster_datasource_plugin);
DATASOURCE_PLUGIN_EMPTY_AFTER_LOAD(raster_datasource_plugin);
DATASOURCE_PLUGIN_EMPTY_BEFORE_UNLOAD(raster_datasource_plugin);
raster_datasource::raster_datasource(parameters const& params)
: datasource(params),
desc_(raster_datasource::name(), "utf-8"),
extent_initialized_(false)
{
MAPNIK_LOG_DEBUG(raster) << "raster_datasource: Initializing...";
auto const file = params.get<std::string>("file");
if (!file)
throw datasource_exception("Raster Plugin: missing <file> parameter ");
auto const base = params.get<std::string>("base");
if (base)
filename_ = *base + "/" + *file;
else
filename_ = *file;
multi_tiles_ = *params.get<mapnik::boolean_type>("multi", false);
tile_size_ = *params.get<mapnik::value_integer>("tile_size", 1024);
tile_stride_ = *params.get<mapnik::value_integer>("tile_stride", 1);
auto const format_from_filename = mapnik::type_from_filename(*file);
format_ = *params.get<std::string>("format", format_from_filename ? (*format_from_filename) : "tiff");
auto const lox = params.get<mapnik::value_double>("lox");
auto const loy = params.get<mapnik::value_double>("loy");
auto const hix = params.get<mapnik::value_double>("hix");
auto const hiy = params.get<mapnik::value_double>("hiy");
auto const ext = params.get<std::string>("extent");
if (lox && loy && hix && hiy)
{
extent_.init(*lox, *loy, *hix, *hiy);
extent_initialized_ = true;
}
else if (ext)
{
extent_initialized_ = extent_.from_string(*ext);
}
else // bounding box from image_reader
{
std::unique_ptr<image_reader> reader(mapnik::get_image_reader(*file));
if (!reader)
throw datasource_exception("Raster Plugin: failed to create reader for " + *file);
auto bbox = reader->bounding_box();
if (bbox)
{
extent_ = *bbox;
extent_initialized_ = true;
}
}
if (!extent_initialized_)
{
throw datasource_exception("Raster Plugin: valid <extent> or <lox> <loy> <hix> <hiy> are required");
}
if (multi_tiles_)
{
auto const x_width = params.get<mapnik::value_integer>("x_width");
auto const y_width = params.get<mapnik::value_integer>("y_width");
if (!x_width)
{
throw datasource_exception("Raster Plugin: x-width parameter not supplied for multi-tiled data source.");
}
if (!y_width)
{
throw datasource_exception("Raster Plugin: y-width parameter not supplied for multi-tiled data source.");
}
width_ = x_width.value() * tile_size_;
height_ = y_width.value() * tile_size_;
}
else
{
if (!mapnik::util::exists(filename_))
{
throw datasource_exception("Raster Plugin: " + filename_ + " does not exist");
}
try
{
std::unique_ptr<image_reader> reader(mapnik::get_image_reader(filename_, format_));
if (reader.get())
{
width_ = reader->width();
height_ = reader->height();
}
}
catch (mapnik::image_reader_exception const& ex)
{
throw datasource_exception("Raster Plugin: image reader exception: " + std::string(ex.what()));
}
catch (std::exception const& ex)
{
throw datasource_exception("Raster Plugin: " + std::string(ex.what()));
}
catch (...)
{
throw datasource_exception("Raster Plugin: image reader unknown exception caught");
}
}
MAPNIK_LOG_DEBUG(raster) << "raster_datasource: Raster size=" << width_ << "," << height_;
}
raster_datasource::~raster_datasource() {}
mapnik::datasource::datasource_t raster_datasource::type() const
{
return datasource::Raster;
}
char const* raster_datasource::name()
{
return "raster";
}
mapnik::box2d<double> raster_datasource::envelope() const
{
return extent_;
}
std::optional<mapnik::datasource_geometry_t> raster_datasource::get_geometry_type() const
{
return std::nullopt;
}
layer_descriptor raster_datasource::get_descriptor() const
{
return desc_;
}
featureset_ptr raster_datasource::features(query const& q) const
{
mapnik::view_transform t(width_, height_, extent_, 0, 0);
mapnik::box2d<double> intersect = extent_.intersect(q.get_bbox());
mapnik::box2d<double> ext = t.forward(intersect);
int const width = int(ext.maxx() + 0.5) - int(ext.minx() + 0.5);
int const height = int(ext.maxy() + 0.5) - int(ext.miny() + 0.5);
MAPNIK_LOG_DEBUG(raster) << "raster_datasource: Box size=" << width << "," << height;
if (multi_tiles_)
{
MAPNIK_LOG_DEBUG(raster) << "raster_datasource: Multi-Tiled policy";
tiled_multi_file_policy
policy(filename_, format_, tile_size_, extent_, q.get_bbox(), width_, height_, tile_stride_);
return std::make_shared<raster_featureset<tiled_multi_file_policy>>(policy, extent_, q);
}
else if (width * height > static_cast<int>(tile_size_ * tile_size_ << 2))
{
MAPNIK_LOG_DEBUG(raster) << "raster_datasource: Tiled policy";
tiled_file_policy policy(filename_, format_, tile_size_, extent_, q.get_bbox(), width_, height_);
return std::make_shared<raster_featureset<tiled_file_policy>>(policy, extent_, q);
}
else
{
MAPNIK_LOG_DEBUG(raster) << "raster_datasource: Single file";
raster_info info(filename_, format_, extent_, width_, height_);
single_file_policy policy(info);
return std::make_shared<raster_featureset<single_file_policy>>(policy, extent_, q);
}
}
featureset_ptr raster_datasource::features_at_point(coord2d const&, double tol) const
{
MAPNIK_LOG_WARN(raster) << "raster_datasource: feature_at_point not supported";
return mapnik::make_empty_featureset();
}
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