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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2007 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
*
*****************************************************************************/
//$Id$
#include "gdal_featureset.hpp"
#include <gdal_priv.h>
using mapnik::query;
using mapnik::Envelope;
using mapnik::Feature;
using mapnik::feature_ptr;
using mapnik::CoordTransform;
gdal_featureset::gdal_featureset(GDALDataset & dataset, query const& q)
: dataset_(dataset),
query_extent_(q.get_bbox()),
first_(true) {}
gdal_featureset::~gdal_featureset() {}
feature_ptr gdal_featureset::next()
{
if (first_)
{
first_ = false;
feature_ptr feature(new Feature(1));
GDALRasterBand * red = 0;
GDALRasterBand * green = 0;
GDALRasterBand * blue = 0;
GDALRasterBand * alpha = 0;
GDALRasterBand * grey = 0;
for (int i = 0; i < dataset_.GetRasterCount() ;++i)
{
GDALRasterBand * band = dataset_.GetRasterBand(i+1);
//if (band->GetOverviewCount() > 0)
//{
// band = band->GetOverview(0);
//}
#ifdef MAPNIK_DEBUG
int bsx,bsy;
band->GetBlockSize(&bsx,&bsy);
std::cout << boost::format("Block=%dx%d Type=%s Color=%s \n") % bsx % bsy
% GDALGetDataTypeName(band->GetRasterDataType())
% GDALGetColorInterpretationName(band->GetColorInterpretation());
#endif
GDALColorInterp color_interp = band->GetColorInterpretation();
switch (color_interp)
{
case GCI_RedBand:
red = band;
break;
case GCI_GreenBand:
green = band;
break;
case GCI_BlueBand:
blue = band;
break;
case GCI_AlphaBand:
alpha = band;
break;
case GCI_GrayIndex:
grey = band;
break;
case GCI_PaletteIndex:
{
grey = band;
GDALColorTable *color_table = band->GetColorTable();
if ( color_table)
{
int count = color_table->GetColorEntryCount();
#ifdef MAPNIK_DEBUG
std::cout << "Color Table count = " << count << "\n";
#endif
for ( int i = 0; i < count; i++ )
{
const GDALColorEntry *ce = color_table->GetColorEntry ( i );
if (!ce ) continue;
#ifdef MAPNIK_DEBUG
std::cout << "color entry RGB (" << ce->c1 <<"," <<ce->c2 << "," << ce->c3 << ")\n";
#endif
}
}
break;
}
case GCI_Undefined:
grey = band;
break;
default:
break;
;
}
}
unsigned raster_xsize = dataset_.GetRasterXSize();
unsigned raster_ysize = dataset_.GetRasterYSize();
double tr[6];
dataset_.GetGeoTransform(tr);
double x0 = tr[0];
double y0 = tr[3];
double x1 = tr[0] + raster_xsize * tr[1] + raster_ysize * tr[2];
double y1 = tr[3] + raster_xsize * tr[4] + raster_ysize * tr[5];
Envelope<double> raster_extent(x0,y0,x1,y1);
CoordTransform t (raster_xsize,raster_ysize,raster_extent,0,0);
Envelope<double> intersection = raster_extent.intersect(query_extent_);
Envelope<double> box = t.forward(intersection);
int start_x = int(box.minx());
int start_y = int(box.miny());
int width = int(box.width());
int height = int(box.height());
if (width > 0 && height > 0)
{
mapnik::ImageData32 image(width,height);
image.set(0xffffffff);
if (red && green && blue)
{
red->RasterIO (GF_Read,start_x,start_y,width,height, image.getBytes() + 0, width,height, GDT_Byte,4,4*width);
green->RasterIO(GF_Read,start_x,start_y,width,height, image.getBytes() + 1, width,height, GDT_Byte,4,4*width);
blue->RasterIO (GF_Read,start_x,start_y,width,height, image.getBytes() + 2, width,height, GDT_Byte,4,4*width);
if (alpha)
{
alpha->RasterIO(GF_Read,start_x,start_y,width,height, image.getBytes() + 3, width,height, GDT_Byte,4,4*width);
}
}
else if (grey)
{
grey->RasterIO(GF_Read,start_x,start_y,width,height,image.getBytes() + 0, width, height,GDT_Byte,4,4*width);
grey->RasterIO(GF_Read,start_x,start_y,width,height,image.getBytes() + 1, width, height,GDT_Byte,4,4*width);
grey->RasterIO(GF_Read,start_x,start_y,width,height,image.getBytes() + 2, width, height,GDT_Byte,4,4*width);
if (alpha)
{
alpha->RasterIO(GF_Read,start_x,start_y,width,height, image.getBytes() + 3, width,height, GDT_Byte,4,4*width);
}
}
feature->set_raster(mapnik::raster_ptr(new mapnik::raster(intersection,image)));
return feature;
}
}
return feature_ptr();
}
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