/***************************************************************************** * * This file is part of Mapnik (c++ mapping toolkit) * * Copyright (C) 2011 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 "rasterlite_featureset.hpp" // mapnik #include <mapnik/debug.hpp> #include <mapnik/image_util.hpp> #include <mapnik/feature_factory.hpp> // boost #include <boost/make_shared.hpp> using mapnik::query; using mapnik::coord2d; using mapnik::box2d; using mapnik::Feature; using mapnik::feature_ptr; using mapnik::geometry_type; using mapnik::query; using mapnik::feature_factory; rasterlite_featureset::rasterlite_featureset(void* dataset, rasterlite_query q) : dataset_(dataset), gquery_(q), first_(true), ctx_(boost::make_shared<mapnik::context_type>()) { rasterliteSetBackgroundColor(dataset_, 255, 0, 255); rasterliteSetTransparentColor(dataset_, 255, 0, 255); } rasterlite_featureset::~rasterlite_featureset() { MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_featureset: Closing"; rasterliteClose(dataset_); } feature_ptr rasterlite_featureset::next() { if (first_) { first_ = false; query *q = boost::get<query>(&gquery_); if (q) { return get_feature(*q); } else { coord2d *p = boost::get<coord2d>(&gquery_); if (p) { return get_feature_at_point(*p); } } // should never reach here } return feature_ptr(); } feature_ptr rasterlite_featureset::get_feature(mapnik::query const& q) { MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_featureset: Running get_feature"; feature_ptr feature(feature_factory::create(ctx_,1)); double x0, y0, x1, y1; rasterliteGetExtent (dataset_, &x0, &y0, &x1, &y1); box2d<double> raster_extent(x0, y0, x1, y1); box2d<double> intersect = raster_extent.intersect(q.get_bbox()); const int width = static_cast<int>(boost::get<0>(q.resolution()) * intersect.width() + 0.5); const int height = static_cast<int>(boost::get<0>(q.resolution()) * intersect.height() + 0.5); const double pixel_size = (intersect.width() >= intersect.height()) ? (intersect.width() / (double) width) : (intersect.height() / (double) height); MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_featureset: Raster extent=" << raster_extent; MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_featureset: View extent=" << q.get_bbox(); MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_featureset: Intersect extent=" << intersect; MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_featureset: Query resolution=" << boost::get<0>(q.resolution()) << "," << boost::get<1>(q.resolution()); MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_featureset: Size=" << width << " " << height; MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_featureset: Pixel Size=" << pixel_size; if (width > 0 && height > 0) { int size = 0; void* raster = 0; if (rasterliteGetRawImageByRect(dataset_, intersect.minx(), intersect.miny(), intersect.maxx(), intersect.maxy(), pixel_size, width, height, GAIA_RGBA_ARRAY, &raster, &size) == RASTERLITE_OK) { if (size > 0) { mapnik::image_data_32 image(width, height); image.set(0xffffffff); unsigned char* raster_data = static_cast<unsigned char*>(raster); unsigned char* image_data = image.getBytes(); memcpy (image_data, raster_data, size); feature->set_raster(boost::make_shared<mapnik::raster>(intersect,image)); free (raster); MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_featureset: Done"; } else { MAPNIK_LOG_ERROR(rasterlite) << "Rasterlite Plugin: Error " << rasterliteGetLastError (dataset_); } } return feature; } return feature_ptr(); } feature_ptr rasterlite_featureset::get_feature_at_point(mapnik::coord2d const& pt) { return feature_ptr(); }