94 lines
3 KiB
C++
94 lines
3 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2021 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef GDAL_FEATURESET_HPP
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#define GDAL_FEATURESET_HPP
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// mapnik
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#include <mapnik/feature.hpp>
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#include <mapnik/featureset.hpp>
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#include <mapnik/query.hpp>
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#include <mapnik/util/variant.hpp>
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#include <optional>
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class GDALDataset;
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class GDALRasterBand;
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using gdal_query = mapnik::util::variant<mapnik::query, mapnik::coord2d>;
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class gdal_featureset : public mapnik::Featureset
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{
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struct query_dispatch
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{
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query_dispatch(gdal_featureset& featureset)
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: featureset_(featureset)
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{}
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mapnik::feature_ptr operator()(mapnik::query const& q) const { return featureset_.get_feature(q); }
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mapnik::feature_ptr operator()(mapnik::coord2d const& p) const { return featureset_.get_feature_at_point(p); }
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gdal_featureset& featureset_;
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};
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public:
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gdal_featureset(GDALDataset& dataset,
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int band,
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gdal_query q,
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mapnik::box2d<double> extent,
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unsigned width,
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unsigned height,
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int nbands,
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double dx,
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double dy,
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std::optional<double> const& nodata,
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double nodata_tolerance,
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int64_t max_image_area);
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virtual ~gdal_featureset();
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mapnik::feature_ptr next();
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private:
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void find_best_overview(int bandNumber,
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int ideal_width,
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int ideal_height,
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int& current_width,
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int& current_height) const;
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mapnik::feature_ptr get_feature(mapnik::query const& q);
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mapnik::feature_ptr get_feature_at_point(mapnik::coord2d const& p);
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GDALDataset& dataset_;
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mapnik::context_ptr ctx_;
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int band_;
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gdal_query gquery_;
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mapnik::box2d<double> raster_extent_;
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unsigned raster_width_;
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unsigned raster_height_;
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double dx_;
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double dy_;
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int nbands_;
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std::optional<double> nodata_value_;
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double nodata_tolerance_;
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int64_t max_image_area_;
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bool first_;
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};
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#endif // GDAL_FEATURESET_HPP
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