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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
*
*****************************************************************************/
#include "catch.hpp"
#include <mapnik/datasource.hpp>
#include <mapnik/datasource_cache.hpp>
#include <mapnik/raster.hpp>
#include <mapnik/util/fs.hpp>
namespace {
mapnik::datasource_ptr get_gdal_ds(std::string const& file_name, std::optional<mapnik::value_integer> band)
{
bool const have_gdal_plugin = mapnik::datasource_cache::instance().plugin_registered("gdal");
if (!have_gdal_plugin)
{
return mapnik::datasource_ptr();
}
mapnik::parameters params;
params["type"] = std::string("gdal");
params["file"] = file_name;
if (band)
{
params["band"] = *band;
}
auto ds = mapnik::datasource_cache::instance().create(params);
REQUIRE(ds != nullptr);
return ds;
}
} // anonymous namespace
TEST_CASE("gdal")
{
SECTION("upsampling")
{
std::string dataset = "test/data/tiff/ndvi_256x256_gray32f_tiled.tif";
mapnik::datasource_ptr ds = get_gdal_ds(dataset, 1);
if (!ds)
{
// GDAL plugin not built.
return;
}
mapnik::box2d<double> envelope = ds->envelope();
CHECK(envelope.width() == 256);
CHECK(envelope.height() == 256);
// Indicate four times bigger resolution.
mapnik::query::resolution_type resolution(2.0, 2.0);
mapnik::query query(envelope, resolution, 1.0);
auto features = ds->features(query);
auto feature = features->next();
mapnik::raster_ptr raster = feature->get_raster();
REQUIRE(raster != nullptr);
// Check whether result is not scaled up.
CHECK(raster->data_.width() == 256);
CHECK(raster->data_.height() == 256);
}
} // END TEST CASE
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