777 lines
34 KiB
C++
777 lines
34 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) 2015 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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// mapnik
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#include <mapnik/datasource.hpp>
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#include <mapnik/global.hpp>
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#include <mapnik/debug.hpp>
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#include <mapnik/image.hpp>
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#include <mapnik/raster.hpp>
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#include <mapnik/view_transform.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/feature_factory.hpp>
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// stl
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#include <cmath>
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#include <memory>
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#include <sstream>
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#include "gdal_featureset.hpp"
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#include <gdal_priv.h>
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using mapnik::box2d;
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using mapnik::feature_ptr;
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using mapnik::view_transform;
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using mapnik::datasource_exception;
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using mapnik::feature_factory;
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#ifdef MAPNIK_LOG
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namespace {
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void 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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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: " << band_overviews << " overviews found!";
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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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MAPNIK_LOG_DEBUG(gdal) << "Overview= " << b
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<< " Width=" << overview->GetXSize()
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<< " Height=" << overview->GetYSize();
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}
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}
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else
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{
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: No overviews found!";
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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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MAPNIK_LOG_DEBUG(gdal) << "Block=" << bsx << "x" << bsy
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<< " Scale=" << scale
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<< " Type=" << GDALGetDataTypeName(band->GetRasterDataType())
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<< "Color=" << GDALGetColorInterpretationName(band->GetColorInterpretation());
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}
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} // anonymous ns
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#endif
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gdal_featureset::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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boost::optional<double> const& nodata,
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double nodata_tolerance,
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int64_t max_image_area)
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: dataset_(dataset),
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ctx_(std::make_shared<mapnik::context_type>()),
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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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nodata_value_(nodata),
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nodata_tolerance_(nodata_tolerance),
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max_image_area_(max_image_area),
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first_(true)
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{
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ctx_->push("nodata");
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}
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gdal_featureset::~gdal_featureset()
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{
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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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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Next feature in Dataset=" << &dataset_;
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return mapnik::util::apply_visitor(query_dispatch(*this), gquery_);
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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 = feature_factory::create(ctx_,1);
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int raster_has_nodata = 0;
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double raster_nodata = 0;
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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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CPLErr raster_io_error = CE_None;
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/*
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#ifdef MAPNIK_LOG
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double tr[6];
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dataset_.GetGeoTransform(tr);
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const double dx = tr[1];
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const double dy = tr[5];
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: dx_=" << dx_ << " dx=" << dx << " dy_=" << dy_ << "dy=" << dy;
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#endif
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*/
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view_transform 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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// get the filter factor if it is set
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double filter_factor = q.get_filter_factor();
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//size of resized output pixel in source image domain
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double margin_x = 1.0 / (std::fabs(dx_) * std::get<0>(q.resolution()));
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double margin_y = 1.0 / (std::fabs(dy_) * std::get<1>(q.resolution()));
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: margin_x=" << margin_x;
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: margin_y=" << margin_y;
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if (margin_x < 1)
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{
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margin_x = 1.0;
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}
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if (margin_y < 1)
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{
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margin_y = 1.0;
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}
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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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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: x_off=" << x_off;
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: y_off=" << y_off;
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: end_x=" << end_x;
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: end_y=" << end_y;
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//clip to available data
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if (x_off < 0)
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{
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x_off = 0;
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}
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if (y_off < 0)
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{
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y_off = 0;
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}
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if (end_x > (int)raster_width_)
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{
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end_x = raster_width_;
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}
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if (end_y > (int)raster_height_)
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{
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end_y = raster_height_;
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}
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// width and height of the portion of the source image we are requesting
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int width = end_x - x_off;
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int height = end_y - y_off;
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// In many cases we want GDAL to simply return the exact image so we
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// can handle resampling internally in mapnik. In other cases such as
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// when overviews exist or when the image allocated might be too large
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// we want to utilize some resampling in GDAL instead.
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int im_height = height;
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int im_width = width;
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double im_offset_x = x_off;
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double im_offset_y = y_off;
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int current_width = (int)raster_width_;
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int current_height = (int)raster_height_;
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// loop through overviews -- snap up in resolution to closest overview if necessary
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// we find an image size that most resembles the resolution of our output image.
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double width_res = std::get<0>(q.resolution());
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double height_res = std::get<1>(q.resolution());
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int res_adjusted_raster_width = static_cast<int>(std::floor(((double)raster_width_ * width_res) + .5));
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int res_adjusted_raster_height = static_cast<int>(std::floor(((double)raster_height_ * height_res) + .5));
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if (band_ > 0 && band_ < nbands_)
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{
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GDALRasterBand * band = dataset_.GetRasterBand(band_);
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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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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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int overview_width = overview->GetXSize();
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int overview_height = overview->GetYSize();
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if ((overview_width < current_width || overview_height < current_height) &&
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res_adjusted_raster_width <= overview_width &&
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res_adjusted_raster_height <= overview_height)
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{
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current_width = overview_width;
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current_height = overview_height;
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}
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}
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}
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}
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else
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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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int band_overviews = band->GetOverviewCount();
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if (band_overviews > 0)
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{
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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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int overview_width = overview->GetXSize();
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int overview_height = overview->GetYSize();
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if ((overview_width < current_width || overview_height < current_height) &&
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res_adjusted_raster_width <= overview_width &&
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res_adjusted_raster_height <= overview_height)
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{
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current_width = overview_width;
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current_height = overview_height;
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}
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}
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}
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}
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}
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if (current_width != (int)raster_width_ || current_height != (int)raster_height_)
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{
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if (current_width != (int)raster_width_)
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{
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double ratio = (double)current_width / (double)raster_width_;
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int adjusted_width = static_cast<int>(std::floor((ratio * im_width) + 0.5));
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double adjusted_ratio = (double)adjusted_width / (double)im_width;
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im_offset_x = adjusted_ratio * im_offset_x;
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im_width = adjusted_width;
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}
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if (current_height != (int)raster_height_)
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{
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double ratio = (double)current_height / (double)raster_height_;
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int adjusted_height = static_cast<int>(std::floor((ratio * im_height) + 0.5));
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double adjusted_ratio = (double)adjusted_height / (double)im_height;
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im_offset_y = adjusted_ratio * im_offset_y;
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im_height = adjusted_height;
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}
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}
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int64_t im_area = (int64_t)im_width * (int64_t)im_height;
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if (im_area > max_image_area_)
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{
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int adjusted_width = static_cast<int>(std::round(std::sqrt(max_image_area_ * ((double)im_width / (double)im_height))));
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int adjusted_height = static_cast<int>(std::round(std::sqrt(max_image_area_ * ((double)im_height / (double)im_width))));
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if (adjusted_width < 1)
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{
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adjusted_width = 1;
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}
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if (adjusted_height < 1)
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{
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adjusted_height = 1;
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}
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double ratio_x = (double)adjusted_width / (double)im_width;
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double ratio_y = (double)adjusted_height / (double)im_height;
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im_offset_x = ratio_x * im_offset_x;
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im_offset_y = ratio_y * im_offset_y;
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im_width = adjusted_width;
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im_height = adjusted_height;
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current_width = static_cast<int>(std::floor((ratio_x * current_width) + 0.5));
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current_height = static_cast<int>(std::floor((ratio_y * current_height) + 0.5));
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}
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//calculate actual box2d of returned raster
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view_transform t2(current_width, current_height, raster_extent_, 0, 0);
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box2d<double> feature_raster_extent(im_offset_x, im_offset_y, im_offset_x + im_width, im_offset_y + im_height);
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Feature Raster extent=" << feature_raster_extent;
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feature_raster_extent = t2.backward(feature_raster_extent);
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Raster extent=" << raster_extent_;
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Feature Raster extent=" << feature_raster_extent;
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: View extent=" << intersect;
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Query resolution=" << std::get<0>(q.resolution()) << "," << std::get<1>(q.resolution());
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: StartX=" << x_off << " StartY=" << y_off << " Width=" << width << " Height=" << height;
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: IM StartX=" << im_offset_x << " StartY=" << im_offset_y << " Width=" << im_width << " Height=" << im_height;
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if (width > 0 && height > 0)
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{
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Requested Image Size=(" << width << "," << height << ")";
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Image Size=(" << im_width << "," << im_height << ")";
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Reading band=" << band_;
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if (band_ > 0) // we are querying a single band
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{
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GDALRasterBand * band = dataset_.GetRasterBand(band_);
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if (band_ > nbands_)
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{
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std::ostringstream s;
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s << "GDAL Plugin: " << band_ << " is an invalid band, dataset only has " << nbands_ << "bands";
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throw datasource_exception(s.str());
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}
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GDALDataType band_type = band->GetRasterDataType();
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switch (band_type)
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{
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case GDT_Byte:
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{
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mapnik::image_gray8 image(im_width, im_height);
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image.set(std::numeric_limits<std::uint8_t>::max());
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raster_nodata = band->GetNoDataValue(&raster_has_nodata);
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raster_io_error = band->RasterIO(GF_Read, x_off, y_off, width, height,
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image.data(), image.width(), image.height(),
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GDT_Byte, 0, 0);
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if (raster_io_error == CE_Failure)
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{
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throw datasource_exception(CPLGetLastErrorMsg());
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}
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mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(feature_raster_extent, intersect, image, filter_factor);
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// set nodata value to be used in raster colorizer
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if (nodata_value_) raster->set_nodata(*nodata_value_);
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else raster->set_nodata(raster_nodata);
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feature->set_raster(raster);
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break;
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}
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case GDT_Float64:
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case GDT_Float32:
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{
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mapnik::image_gray32f image(im_width, im_height);
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image.set(std::numeric_limits<float>::max());
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raster_nodata = band->GetNoDataValue(&raster_has_nodata);
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raster_io_error = band->RasterIO(GF_Read, x_off, y_off, width, height,
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image.data(), image.width(), image.height(),
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GDT_Float32, 0, 0);
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if (raster_io_error == CE_Failure)
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{
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throw datasource_exception(CPLGetLastErrorMsg());
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}
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mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(feature_raster_extent, intersect, image, filter_factor);
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// set nodata value to be used in raster colorizer
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if (nodata_value_) raster->set_nodata(*nodata_value_);
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else raster->set_nodata(raster_nodata);
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feature->set_raster(raster);
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break;
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}
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case GDT_UInt16:
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{
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mapnik::image_gray16 image(im_width, im_height);
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image.set(std::numeric_limits<std::uint16_t>::max());
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raster_nodata = band->GetNoDataValue(&raster_has_nodata);
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raster_io_error = band->RasterIO(GF_Read, x_off, y_off, width, height,
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image.data(), image.width(), image.height(),
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GDT_UInt16, 0, 0);
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if (raster_io_error == CE_Failure)
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{
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throw datasource_exception(CPLGetLastErrorMsg());
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}
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mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(feature_raster_extent, intersect, image, filter_factor);
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// set nodata value to be used in raster colorizer
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if (nodata_value_) raster->set_nodata(*nodata_value_);
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else raster->set_nodata(raster_nodata);
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feature->set_raster(raster);
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break;
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}
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default:
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case GDT_Int16:
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{
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mapnik::image_gray16s image(im_width, im_height);
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image.set(std::numeric_limits<std::int16_t>::max());
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raster_nodata = band->GetNoDataValue(&raster_has_nodata);
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raster_io_error = band->RasterIO(GF_Read, x_off, y_off, width, height,
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image.data(), image.width(), image.height(),
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GDT_Int16, 0, 0);
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if (raster_io_error == CE_Failure)
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{
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throw datasource_exception(CPLGetLastErrorMsg());
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}
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mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(feature_raster_extent, intersect, image, filter_factor);
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// set nodata value to be used in raster colorizer
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if (nodata_value_) raster->set_nodata(*nodata_value_);
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else raster->set_nodata(raster_nodata);
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feature->set_raster(raster);
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break;
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}
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}
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}
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else // working with all bands
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{
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mapnik::image_rgba8 image(im_width, im_height);
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image.set(std::numeric_limits<std::uint32_t>::max());
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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_LOG
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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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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found red band";
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break;
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case GCI_GreenBand:
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green = band;
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found green band";
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break;
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case GCI_BlueBand:
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blue = band;
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MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found blue band";
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break;
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case GCI_AlphaBand:
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alpha = band;
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|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found alpha band";
|
|
break;
|
|
case GCI_GrayIndex:
|
|
grey = band;
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found gray band";
|
|
break;
|
|
case GCI_PaletteIndex:
|
|
{
|
|
grey = band;
|
|
#ifdef MAPNIK_LOG
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found gray band, and colortable...";
|
|
GDALColorTable *color_table = band->GetColorTable();
|
|
|
|
if (color_table)
|
|
{
|
|
int count = color_table->GetColorEntryCount();
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Color Table count=" << count;
|
|
|
|
for (int j = 0; j < count; j++)
|
|
{
|
|
const GDALColorEntry *ce = color_table->GetColorEntry (j);
|
|
if (! ce) continue;
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Color entry RGB=" << ce->c1 << "," <<ce->c2 << "," << ce->c3;
|
|
}
|
|
}
|
|
#endif
|
|
break;
|
|
}
|
|
case GCI_Undefined:
|
|
#if GDAL_VERSION_NUM <= 1730
|
|
if (nbands_ == 4)
|
|
{
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found undefined band (assumming alpha band)";
|
|
alpha = band;
|
|
}
|
|
else
|
|
{
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found undefined band (assumming gray band)";
|
|
grey = band;
|
|
}
|
|
#else
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found undefined band (assumming gray band)";
|
|
grey = band;
|
|
#endif
|
|
break;
|
|
default:
|
|
MAPNIK_LOG_WARN(gdal) << "gdal_featureset: Band type unknown!";
|
|
break;
|
|
}
|
|
}
|
|
if (red && green && blue)
|
|
{
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Processing rgb bands...";
|
|
raster_nodata = red->GetNoDataValue(&raster_has_nodata);
|
|
GDALColorTable *color_table = red->GetColorTable();
|
|
bool has_nodata = nodata_value_ || raster_has_nodata;
|
|
|
|
// we can deduce the alpha channel from nodata in the Byte case
|
|
// by reusing the reading of R,G,B bands directly
|
|
if (has_nodata && !color_table && red->GetRasterDataType() == GDT_Byte)
|
|
{
|
|
double apply_nodata = nodata_value_ ? *nodata_value_ : raster_nodata;
|
|
// read the data in and create an alpha channel from the nodata values
|
|
// TODO - we assume here the nodata value for the red band applies to all bands
|
|
// more details about this at http://trac.osgeo.org/gdal/ticket/2734
|
|
float* imageData = (float*)image.bytes();
|
|
raster_io_error = red->RasterIO(GF_Read, x_off, y_off, width, height,
|
|
imageData, image.width(), image.height(),
|
|
GDT_Float32, 0, 0);
|
|
if (raster_io_error == CE_Failure) {
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
int len = image.width() * image.height();
|
|
for (int i = 0; i < len; ++i)
|
|
{
|
|
if (std::fabs(apply_nodata - imageData[i]) < nodata_tolerance_)
|
|
{
|
|
*reinterpret_cast<unsigned *>(&imageData[i]) = 0;
|
|
}
|
|
else
|
|
{
|
|
*reinterpret_cast<unsigned *>(&imageData[i]) = 0xFFFFFFFF;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Use dataset RasterIO in priority in 99.9% of the cases */
|
|
if( red->GetBand() == 1 && green->GetBand() == 2 && blue->GetBand() == 3 )
|
|
{
|
|
int nBandsToRead = 3;
|
|
if( alpha != nullptr && alpha->GetBand() == 4 && !raster_has_nodata )
|
|
{
|
|
nBandsToRead = 4;
|
|
alpha = nullptr; // to avoid reading it again afterwards
|
|
}
|
|
raster_io_error = dataset_.RasterIO(GF_Read, x_off, y_off, width, height,
|
|
image.bytes(),
|
|
image.width(), image.height(), GDT_Byte,
|
|
nBandsToRead, nullptr,
|
|
4, 4 * image.width(), 1);
|
|
if (raster_io_error == CE_Failure) {
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
raster_io_error = red->RasterIO(GF_Read, x_off, y_off, width, height, image.bytes() + 0,
|
|
image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
|
|
if (raster_io_error == CE_Failure) {
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
raster_io_error = green->RasterIO(GF_Read, x_off, y_off, width, height, image.bytes() + 1,
|
|
image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
|
|
if (raster_io_error == CE_Failure) {
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
raster_io_error = blue->RasterIO(GF_Read, x_off, y_off, width, height, image.bytes() + 2,
|
|
image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
|
|
if (raster_io_error == CE_Failure) {
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
}
|
|
|
|
// In the case we skipped initializing the alpha channel
|
|
if (has_nodata && !color_table && red->GetRasterDataType() == GDT_Byte)
|
|
{
|
|
double apply_nodata = nodata_value_ ? *nodata_value_ : raster_nodata;
|
|
if( apply_nodata >= 0 && apply_nodata <= 255 )
|
|
{
|
|
int len = image.width() * image.height();
|
|
GByte* pabyBytes = (GByte*) image.bytes();
|
|
for (int i = 0; i < len; ++i)
|
|
{
|
|
// TODO - we assume here the nodata value for the red band applies to all bands
|
|
// more details about this at http://trac.osgeo.org/gdal/ticket/2734
|
|
if (std::fabs(apply_nodata - pabyBytes[4*i]) < nodata_tolerance_)
|
|
pabyBytes[4*i + 3] = 0;
|
|
else
|
|
pabyBytes[4*i + 3] = 255;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (grey)
|
|
{
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Processing gray band...";
|
|
raster_nodata = grey->GetNoDataValue(&raster_has_nodata);
|
|
GDALColorTable* color_table = grey->GetColorTable();
|
|
bool has_nodata = nodata_value_ || raster_has_nodata;
|
|
if (!color_table && has_nodata)
|
|
{
|
|
double apply_nodata = nodata_value_ ? *nodata_value_ : raster_nodata;
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: applying nodata value for layer=" << apply_nodata;
|
|
// first read the data in and create an alpha channel from the nodata values
|
|
float* imageData = (float*)image.bytes();
|
|
raster_io_error = grey->RasterIO(GF_Read, x_off, y_off, width, height,
|
|
imageData, image.width(), image.height(),
|
|
GDT_Float32, 0, 0);
|
|
if (raster_io_error == CE_Failure)
|
|
{
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
int len = image.width() * image.height();
|
|
for (int i = 0; i < len; ++i)
|
|
{
|
|
if (std::fabs(apply_nodata - imageData[i]) < nodata_tolerance_)
|
|
{
|
|
*reinterpret_cast<unsigned *>(&imageData[i]) = 0;
|
|
}
|
|
else
|
|
{
|
|
*reinterpret_cast<unsigned *>(&imageData[i]) = 0xFFFFFFFF;
|
|
}
|
|
}
|
|
}
|
|
|
|
raster_io_error = grey->RasterIO(GF_Read, x_off, y_off, width, height, image.bytes() + 0,
|
|
image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
|
|
if (raster_io_error == CE_Failure)
|
|
{
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
|
|
raster_io_error = grey->RasterIO(GF_Read,x_off, y_off, width, height, image.bytes() + 1,
|
|
image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
|
|
if (raster_io_error == CE_Failure)
|
|
{
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
|
|
raster_io_error = grey->RasterIO(GF_Read,x_off, y_off, width, height, image.bytes() + 2,
|
|
image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
|
|
|
|
if (raster_io_error == CE_Failure)
|
|
{
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
|
|
if (color_table)
|
|
{
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Loading color table...";
|
|
for (unsigned y = 0; y < image.height(); ++y)
|
|
{
|
|
unsigned int* row = image.get_row(y);
|
|
for (unsigned x = 0; x < image.width(); ++x)
|
|
{
|
|
unsigned value = row[x] & 0xff;
|
|
const GDALColorEntry *ce = color_table->GetColorEntry(value);
|
|
if (ce)
|
|
{
|
|
row[x] = (ce->c4 << 24)| (ce->c3 << 16) | (ce->c2 << 8) | (ce->c1) ;
|
|
}
|
|
else
|
|
{
|
|
// make lacking color entry fully alpha
|
|
// note - gdal_translate makes black
|
|
row[x] = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (alpha)
|
|
{
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: processing alpha band...";
|
|
if (!raster_has_nodata || (red && green && blue))
|
|
{
|
|
raster_io_error = alpha->RasterIO(GF_Read, x_off, y_off, width, height, image.bytes() + 3,
|
|
image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
|
|
if (raster_io_error == CE_Failure) {
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MAPNIK_LOG_WARN(gdal) << "warning: nodata value (" << raster_nodata << ") used to set transparency instead of alpha band";
|
|
}
|
|
}
|
|
else if( dataset_.GetRasterCount() > 0 && dataset_.GetRasterBand(1) )
|
|
{
|
|
// Check if we have a non-alpha mask band (for example a TIFF internal mask)
|
|
int flags = dataset_.GetRasterBand(1)->GetMaskFlags();
|
|
GDALRasterBand* mask = 0;
|
|
if (flags == GMF_PER_DATASET)
|
|
{
|
|
mask = dataset_.GetRasterBand(1)->GetMaskBand();
|
|
}
|
|
if (mask)
|
|
{
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: found and processing mask band...";
|
|
if (!raster_has_nodata)
|
|
{
|
|
raster_io_error = mask->RasterIO(GF_Read, x_off, y_off, width, height, image.bytes() + 3,
|
|
image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
|
|
if (raster_io_error == CE_Failure) {
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MAPNIK_LOG_WARN(gdal) << "warning: nodata value (" << raster_nodata << ") used to set transparency instead of mask band";
|
|
}
|
|
}
|
|
}
|
|
mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(feature_raster_extent, intersect, image, filter_factor);
|
|
// set nodata value to be used in raster colorizer
|
|
if (nodata_value_) raster->set_nodata(*nodata_value_);
|
|
else raster->set_nodata(raster_nodata);
|
|
feature->set_raster(raster);
|
|
}
|
|
// report actual/original source nodata in feature attributes
|
|
if (raster_has_nodata)
|
|
{
|
|
feature->put("nodata",raster_nodata);
|
|
}
|
|
return feature;
|
|
}
|
|
return feature_ptr();
|
|
}
|
|
|
|
|
|
feature_ptr gdal_featureset::get_feature_at_point(mapnik::coord2d const& pt)
|
|
{
|
|
CPLErr raster_io_error = CE_None;
|
|
|
|
if (band_ > 0)
|
|
{
|
|
unsigned raster_xsize = dataset_.GetRasterXSize();
|
|
unsigned raster_ysize = dataset_.GetRasterYSize();
|
|
|
|
double gt[6];
|
|
dataset_.GetGeoTransform(gt);
|
|
|
|
double det = gt[1] * gt[5] - gt[2] * gt[4];
|
|
// subtract half a pixel width & height because gdal coord reference
|
|
// is the top-left corner of a pixel, not the center.
|
|
double X = pt.x - gt[0] - gt[1]/2;
|
|
double Y = pt.y - gt[3] - gt[5]/2;
|
|
double det1 = gt[1]*Y + gt[4]*X;
|
|
double det2 = gt[2]*Y + gt[5]*X;
|
|
unsigned x = static_cast<unsigned>(det2/det);
|
|
unsigned y = static_cast<unsigned>(det1/det);
|
|
|
|
if (x < raster_xsize && y < raster_ysize)
|
|
{
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: pt.x=" << pt.x << " pt.y=" << pt.y;
|
|
MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: x=" << x << " y=" << y;
|
|
|
|
GDALRasterBand* band = dataset_.GetRasterBand(band_);
|
|
int raster_has_nodata;
|
|
double nodata = band->GetNoDataValue(&raster_has_nodata);
|
|
double value;
|
|
raster_io_error = band->RasterIO(GF_Read, x, y, 1, 1, &value, 1, 1, GDT_Float64, 0, 0);
|
|
if (raster_io_error == CE_Failure) {
|
|
throw datasource_exception(CPLGetLastErrorMsg());
|
|
}
|
|
if (! raster_has_nodata || value != nodata)
|
|
{
|
|
// construct feature
|
|
feature_ptr feature = feature_factory::create(ctx_,1);
|
|
feature->set_geometry(mapnik::geometry::point<double>(pt.x,pt.y));
|
|
feature->put_new("value",value);
|
|
if (raster_has_nodata)
|
|
{
|
|
feature->put_new("nodata",nodata);
|
|
}
|
|
return feature;
|
|
}
|
|
}
|
|
}
|
|
return feature_ptr();
|
|
}
|