397 lines
14 KiB
C++
397 lines
14 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) 2007 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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//$Id$
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#include "gdal_featureset.hpp"
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#include <gdal_priv.h>
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// boost
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#include <boost/format.hpp>
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using mapnik::query;
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using mapnik::coord2d;
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using mapnik::box2d;
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using mapnik::Feature;
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using mapnik::feature_ptr;
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using mapnik::CoordTransform;
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using mapnik::point_impl;
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using mapnik::geometry2d;
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using mapnik::datasource_exception;
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gdal_featureset::gdal_featureset(GDALDataset & dataset, int band, gdal_query q,
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mapnik::box2d<double> extent, double width, double height, int nbands,
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double dx, double dy, double filter_factor)
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: dataset_(dataset),
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band_(band),
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gquery_(q),
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raster_extent_(extent),
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raster_width_(width),
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raster_height_(height),
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dx_(dx),
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dy_(dy),
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nbands_(nbands),
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filter_factor_(filter_factor),
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first_(true) {}
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gdal_featureset::~gdal_featureset()
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{
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: closing dataset = " << &dataset_ << "\n";
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#endif
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GDALClose(&dataset_);
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}
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feature_ptr gdal_featureset::next()
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{
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if (first_)
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{
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first_ = false;
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: featureset, dataset = " << &dataset_ << "\n";
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#endif
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query *q = boost::get<query>(&gquery_);
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if(q) {
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return get_feature(*q);
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} else {
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coord2d *p = boost::get<coord2d>(&gquery_);
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if(p) {
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return get_feature_at_point(*p);
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}
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}
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// should never reach here
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}
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return feature_ptr();
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}
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feature_ptr gdal_featureset::get_feature(mapnik::query const& q)
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{
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feature_ptr feature(new Feature(1));
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GDALRasterBand * red = 0;
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GDALRasterBand * green = 0;
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GDALRasterBand * blue = 0;
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GDALRasterBand * alpha = 0;
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GDALRasterBand * grey = 0;
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/*
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double tr[6];
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dataset_.GetGeoTransform(tr);
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double dx = tr[1];
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double dy = tr[5];
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std::clog << "dx_: " << dx_ << " dx: " << dx << " dy_: " << dy_ << "dy: " << dy << "\n";
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*/
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CoordTransform t(raster_width_,raster_height_,raster_extent_,0,0);
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box2d<double> intersect = raster_extent_.intersect(q.get_bbox());
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box2d<double> box = t.forward(intersect);
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//size of resized output pixel in source image domain
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double margin_x = 1.0/(fabs(dx_)*boost::get<0>(q.resolution()));
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double margin_y = 1.0/(fabs(dy_)*boost::get<1>(q.resolution()));
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if (margin_x < 1)
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margin_x = 1.0;
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if (margin_y < 1)
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margin_y = 1.0;
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//select minimum raster containing whole box
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int x_off = rint(box.minx() - margin_x);
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int y_off = rint(box.miny() - margin_y);
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int end_x = rint(box.maxx() + margin_x);
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int end_y = rint(box.maxy() + margin_y);
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//clip to available data
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if (x_off < 0)
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x_off = 0;
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if (y_off < 0)
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y_off = 0;
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if (end_x > (int)raster_width_)
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end_x = raster_width_;
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if (end_y > (int)raster_height_)
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end_y = raster_height_;
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int width = end_x - x_off;
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int height = end_y - y_off;
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// don't process almost invisible data
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if (box.width() < 0.5)
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width = 0;
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if (box.height() < 0.5)
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height = 0;
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//calculate actual box2d of returned raster
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box2d<double> feature_raster_extent(x_off, y_off, x_off+width, y_off+height);
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intersect = t.backward(feature_raster_extent);
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Raster extent=" << raster_extent_ << "\n";
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std::clog << "GDAL Plugin: View extent=" << intersect << "\n";
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std::clog << "GDAL Plugin: Query resolution=" << boost::get<0>(q.resolution()) << "," << boost::get<1>(q.resolution()) << "\n";
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std::clog << boost::format("GDAL Plugin: StartX=%d StartY=%d Width=%d Height=%d \n") % x_off % y_off % width % height;
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#endif
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if (width > 0 && height > 0)
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{
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double width_res = boost::get<0>(q.resolution());
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double height_res = boost::get<1>(q.resolution());
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int im_width = int(width_res * intersect.width() + 0.5);
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int im_height = int(height_res * intersect.height() + 0.5);
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// if layer-level filter_factor is set, apply it
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if (filter_factor_)
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{
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im_width *= filter_factor_;
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im_height *= filter_factor_;
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}
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// otherwise respect symbolizer level factor applied to query, default of 1.0
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else
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{
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double sym_downsample_factor = q.get_filter_factor();
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im_width *= sym_downsample_factor;
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im_height *= sym_downsample_factor;
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}
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// case where we need to avoid upsampling so that the
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// image can be later scaled within raster_symbolizer
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if (im_width >= width || im_height >= height)
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{
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im_width = width;
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im_height = height;
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}
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if (im_width > 0 && im_height > 0)
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{
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mapnik::image_data_32 image(im_width, im_height);
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image.set(0xffffffff);
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Image Size=(" << im_width << "," << im_height << ")\n";
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std::clog << "GDAL Plugin: Reading band " << band_ << "\n";
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#endif
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typedef std::vector<int,int> pallete;
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if (band_>0) // we are querying a single band
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{
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if (band_ > nbands_)
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throw datasource_exception((boost::format("GDAL Plugin: '%d' is an invalid band, dataset only has '%d' bands\n") % band_ % nbands_).str());
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float *imageData = (float*)image.getBytes();
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GDALRasterBand * band = dataset_.GetRasterBand(band_);
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band->RasterIO(GF_Read, x_off, y_off, width, height,
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imageData, image.width(), image.height(),
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GDT_Float32, 0, 0);
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feature->set_raster(mapnik::raster_ptr(new mapnik::raster(intersect,image)));
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}
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else // working with all bands
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{
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for (int i = 0; i < nbands_; ++i)
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{
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GDALRasterBand * band = dataset_.GetRasterBand(i+1);
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#ifdef MAPNIK_DEBUG
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get_overview_meta(band);
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#endif
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GDALColorInterp color_interp = band->GetColorInterpretation();
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switch (color_interp)
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{
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case GCI_RedBand:
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red = band;
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Found red band" << "\n";
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#endif
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break;
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case GCI_GreenBand:
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green = band;
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Found green band" << "\n";
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#endif
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break;
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case GCI_BlueBand:
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blue = band;
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Found blue band" << "\n";
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#endif
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break;
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case GCI_AlphaBand:
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alpha = band;
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Found alpha band" << "\n";
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#endif
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break;
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case GCI_GrayIndex:
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grey = band;
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Found gray band" << "\n";
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#endif
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break;
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case GCI_PaletteIndex:
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{
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grey = band;
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Found gray band, and colortable..." << "\n";
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#endif
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GDALColorTable *color_table = band->GetColorTable();
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if ( color_table)
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{
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int count = color_table->GetColorEntryCount();
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Color Table count = " << count << "\n";
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#endif
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for ( int i = 0; i < count; i++ )
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{
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const GDALColorEntry *ce = color_table->GetColorEntry ( i );
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if (!ce ) continue;
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Color entry RGB (" << ce->c1 << "," <<ce->c2 << "," << ce->c3 << ")\n";
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#endif
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}
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}
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break;
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}
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case GCI_Undefined:
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: Found undefined band (assumming gray band)" << "\n";
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#endif
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grey = band;
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break;
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default:
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: band type unknown!" << "\n";
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#endif
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break;
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}
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}
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if (red && green && blue)
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{
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: processing rgb bands..." << "\n";
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#endif
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red->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 0,
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image.width(),image.height(),GDT_Byte,4,4*image.width());
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green->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 1,
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image.width(),image.height(),GDT_Byte,4,4*image.width());
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blue->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 2,
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image.width(),image.height(),GDT_Byte,4,4*image.width());
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}
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else if (grey)
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{
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: processing gray band..." << "\n";
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#endif
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// TODO : apply colormap if present
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grey->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 0,
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image.width(),image.height(),GDT_Byte, 4, 4 * image.width());
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grey->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 1,
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image.width(),image.height(),GDT_Byte, 4, 4 * image.width());
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grey->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 2,
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image.width(),image.height(),GDT_Byte, 4, 4 * image.width());
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}
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if (alpha)
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{
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#ifdef MAPNIK_DEBUG
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std::clog << "GDAL Plugin: processing alpha band..." << "\n";
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#endif
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alpha->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 3,
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image.width(),image.height(),GDT_Byte,4,4*image.width());
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}
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feature->set_raster(mapnik::raster_ptr(new mapnik::raster(intersect,image)));
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}
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return feature;
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}
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}
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return feature_ptr();
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}
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feature_ptr gdal_featureset::get_feature_at_point(mapnik::coord2d const& pt)
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{
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if (band_>0) {
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unsigned raster_xsize = dataset_.GetRasterXSize();
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unsigned raster_ysize = dataset_.GetRasterYSize();
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double gt[6];
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dataset_.GetGeoTransform(gt);
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double det = gt[1]*gt[5] - gt[2]*gt[4];
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// subtract half a pixel width & height because gdal coord reference
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// is the top-left corner of a pixel, not the center.
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double X = pt.x - gt[0] - gt[1]/2;
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double Y = pt.y - gt[3] - gt[5]/2;
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double det1 = gt[1]*Y + gt[4]*X;
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double det2 = gt[2]*Y + gt[5]*X;
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unsigned x = det2/det, y = det1/det;
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if(0<=x && x<raster_xsize && 0<=y && y<raster_ysize) {
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#ifdef MAPNIK_DEBUG
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std::clog << boost::format("GDAL Plugin: pt.x=%f pt.y=%f\n") % pt.x % pt.y;
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std::clog << boost::format("GDAL Plugin: x=%f y=%f\n") % x % y;
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#endif
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GDALRasterBand * band = dataset_.GetRasterBand(band_);
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int hasNoData;
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double nodata = band->GetNoDataValue(&hasNoData);
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double value;
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band->RasterIO(GF_Read, x, y, 1, 1, &value, 1, 1, GDT_Float64, 0, 0);
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if(!hasNoData || value!=nodata) {
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// construct feature
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feature_ptr feature(new Feature(1));
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geometry2d * point = new point_impl;
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point->move_to(pt.x, pt.y);
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feature->add_geometry(point);
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(*feature)["value"] = value;
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return feature;
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}
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}
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}
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return feature_ptr();
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}
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void gdal_featureset::get_overview_meta(GDALRasterBand * band)
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{
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int band_overviews = band->GetOverviewCount();
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if (band_overviews > 0)
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{
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std::clog << "GDAL Plugin: "<< band_overviews << " overviews found!" << "\n";
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for (int b = 0; b < band_overviews; b++)
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{
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GDALRasterBand * overview = band->GetOverview (b);
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std::clog << boost::format("GDAL Plugin: Overview=%d Width=%d Height=%d \n")
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% b % overview->GetXSize() % overview->GetYSize();
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}
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}
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else
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{
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std::clog << "GDAL Plugin: No overviews found!" << "\n";
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}
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int bsx,bsy;
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double scale;
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band->GetBlockSize(&bsx,&bsy);
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scale = band->GetScale();
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std::clog << boost::format("GDAL Plugin: Block=%dx%d Scale=%f Type=%s Color=%s \n") % bsx % bsy % scale
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% GDALGetDataTypeName(band->GetRasterDataType())
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% GDALGetColorInterpretationName(band->GetColorInterpretation());
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}
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