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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
*
*****************************************************************************/
// mapnik
#include <mapnik/debug.hpp>
#include <mapnik/image.hpp>
#include <mapnik/raster.hpp>
#include <mapnik/view_transform.hpp>
#include <mapnik/image_reader.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/feature_factory.hpp>
#include <mapnik/util/variant.hpp>
#include <mapnik/warning.hpp>
MAPNIK_DISABLE_WARNING_PUSH
#include <mapnik/warning_ignore.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/format.hpp>
MAPNIK_DISABLE_WARNING_POP
#include "raster_featureset.hpp"
using mapnik::feature_factory;
using mapnik::feature_ptr;
using mapnik::image_reader;
using mapnik::image_rgba8;
using mapnik::query;
using mapnik::raster;
template<typename LookupPolicy>
raster_featureset<LookupPolicy>::raster_featureset(LookupPolicy const& policy,
box2d<double> const& extent,
query const& q)
: policy_(policy),
feature_id_(1),
ctx_(std::make_shared<mapnik::context_type>()),
extent_(extent),
bbox_(q.get_bbox()),
curIter_(policy_.begin()),
endIter_(policy_.end()),
filter_factor_(q.get_filter_factor())
{}
template<typename LookupPolicy>
raster_featureset<LookupPolicy>::~raster_featureset()
{}
template<typename LookupPolicy>
feature_ptr raster_featureset<LookupPolicy>::next()
{
if (curIter_ != endIter_)
{
feature_ptr feature(feature_factory::create(ctx_, feature_id_++));
try
{
std::unique_ptr<image_reader> reader(mapnik::get_image_reader(curIter_->file(), curIter_->format()));
MAPNIK_LOG_DEBUG(raster) << "raster_featureset: Reader=" << curIter_->format() << "," << curIter_->file()
<< ",size(" << curIter_->width() << "," << curIter_->height() << ")";
if (reader.get())
{
int image_width = policy_.img_width(reader->width());
int image_height = policy_.img_height(reader->height());
if (image_width > 0 && image_height > 0)
{
mapnik::view_transform t(image_width, image_height, extent_, 0, 0);
box2d<double> intersect = bbox_.intersect(curIter_->envelope());
box2d<double> ext = t.forward(intersect);
box2d<double> rem = policy_.transform(ext);
// select minimum raster containing whole ext
int x_off = static_cast<int>(std::floor(ext.minx()));
int y_off = static_cast<int>(std::floor(ext.miny()));
int end_x = static_cast<int>(std::ceil(ext.maxx()));
int end_y = static_cast<int>(std::ceil(ext.maxy()));
// clip to available data
if (x_off >= image_width)
x_off = image_width - 1;
if (y_off >= image_height)
y_off = image_height - 1;
if (x_off < 0)
x_off = 0;
if (y_off < 0)
y_off = 0;
if (end_x > image_width)
end_x = image_width;
if (end_y > image_height)
end_y = image_height;
int width = end_x - x_off;
int height = end_y - y_off;
if (width < 1)
width = 1;
if (height < 1)
height = 1;
// calculate actual box2d of returned raster
box2d<double> feature_raster_extent(rem.minx() + x_off,
rem.miny() + y_off,
rem.maxx() + x_off + width,
rem.maxy() + y_off + height);
feature_raster_extent = t.backward(feature_raster_extent);
mapnik::image_any data = reader->read(x_off, y_off, width, height);
mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(feature_raster_extent,
intersect,
std::move(data),
filter_factor_);
feature->set_raster(raster);
}
}
}
catch (mapnik::image_reader_exception const& ex)
{
MAPNIK_LOG_ERROR(raster) << "Raster Plugin: image reader exception caught: " << ex.what();
}
catch (std::exception const& ex)
{
MAPNIK_LOG_ERROR(raster) << "Raster Plugin: " << ex.what();
}
catch (...)
{
MAPNIK_LOG_ERROR(raster) << "Raster Plugin: exception caught";
}
++curIter_;
return feature;
}
return feature_ptr();
}
std::string tiled_multi_file_policy::interpolate(std::string const& pattern, int x, int y) const
{
// TODO: make from some sort of configurable interpolation
int tms_y = tile_stride_ * ((image_height_ / tile_size_) - y - 1);
int tms_x = tile_stride_ * x;
// TODO - optimize by avoiding boost::format
std::string xs =
(boost::format("%03d/%03d/%03d") % (tms_x / 1000000) % ((tms_x / 1000) % 1000) % (tms_x % 1000)).str();
std::string ys =
(boost::format("%03d/%03d/%03d") % (tms_y / 1000000) % ((tms_y / 1000) % 1000) % (tms_y % 1000)).str();
std::string rv(pattern);
boost::algorithm::replace_all(rv, "${x}", xs);
boost::algorithm::replace_all(rv, "${y}", ys);
return rv;
}
template class raster_featureset<single_file_policy>;
template class raster_featureset<tiled_file_policy>;
template class raster_featureset<tiled_multi_file_policy>;
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