예제 #1
0
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>(std::get<0>(q.resolution()) * intersect.width() + 0.5);
    const int height = static_cast<int>(std::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=" << std::get<0>(q.resolution())  << "," << std::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_rgba8 image(width,height);
                unsigned char* raster_data = static_cast<unsigned char*>(raster);
                std::memcpy(image.bytes(), raster_data, size);
                feature->set_raster(std::make_shared<mapnik::raster>(intersect, std::move(image), 1.0));
                MAPNIK_LOG_DEBUG(rasterlite) << "rasterlite_featureset: Done";
            }
            else
            {
                MAPNIK_LOG_ERROR(rasterlite) << "Rasterlite Plugin: Error " << rasterliteGetLastError (dataset_);
            }
        }

        return feature;
    }
    return feature_ptr();
}
예제 #2
0
mapnik::featureset_ptr geojson_datasource::features(mapnik::query const& q) const
{
    // if the query box intersects our world extent then query for features
    mapnik::box2d<double> const& box = q.get_bbox();
    if (extent_.intersects(box))
    {
        geojson_featureset::array_type index_array;
        if (tree_)
        {
            tree_->query(boost::geometry::index::intersects(box),std::back_inserter(index_array));
            // sort index array to preserve original feature ordering in GeoJSON
            std::sort(index_array.begin(),index_array.end(),
                      [] (item_type const& item0, item_type const& item1)
                      {
                          return item0.second.first < item1.second.first;
                      });
            if (cache_features_)
            {
                return std::make_shared<geojson_featureset>(features_, std::move(index_array));
            }
            else
            {
                return std::make_shared<geojson_memory_index_featureset>(filename_, std::move(index_array));
            }
        }
        else if (has_disk_index_)
        {
            mapnik::filter_in_box filter(q.get_bbox());
            return std::make_shared<geojson_index_featureset>(filename_, filter);
        }

    }
    // otherwise return an empty featureset
    return mapnik::make_invalid_featureset();
}
예제 #3
0
mapnik::featureset_ptr csv_datasource::features(mapnik::query const& q) const
{
    for (auto const& name : q.property_names())
    {
        bool found_name = false;
        for (auto const& header : headers_)
        {
            if (header == name)
            {
                found_name = true;
                break;
            }
        }
        if (!found_name)
        {
            std::ostringstream s;
            s << "CSV Plugin: no attribute '" << name << "'. Valid attributes are: "
              << boost::algorithm::join(headers_, ",") << ".";
            throw mapnik::datasource_exception(s.str());
        }
    }

    mapnik::box2d<double> const& box = q.get_bbox();
    if (extent_.intersects(box))
    {
        if (tree_)
        {
            csv_featureset::array_type index_array;
            tree_->query(boost::geometry::index::intersects(box),std::back_inserter(index_array));
            std::sort(index_array.begin(),index_array.end(),
                      [] (item_type const& item0, item_type const& item1)
                      {
                          return item0.second.first < item1.second.first;
                      });
            if (inline_string_.empty())
            {
                return std::make_shared<csv_featureset>(filename_, locator_, separator_, quote_, headers_, ctx_, std::move(index_array));
            }
            else
            {
                return std::make_shared<csv_inline_featureset>(inline_string_, locator_, separator_, quote_, headers_, ctx_, std::move(index_array));
            }
        }
        else if (has_disk_index_)
        {
            mapnik::filter_in_box filter(q.get_bbox());
            return std::make_shared<csv_index_featureset>(filename_, filter, locator_, separator_, quote_, headers_, ctx_);
        }
    }
    return mapnik::featureset_ptr();
}
예제 #4
0
 virtual mapnik::featureset_ptr features(mapnik::query const& q) const
 {
     mapnik::box2d<double> const& actual_bbox = q.get_bbox();
     REQUIRE(actual_bbox.minx() == Approx(expected_query_bbox_.minx()));
     REQUIRE(actual_bbox.miny() == Approx(expected_query_bbox_.miny()));
     REQUIRE(actual_bbox.maxx() == Approx(expected_query_bbox_.maxx()));
     REQUIRE(actual_bbox.maxy() == Approx(expected_query_bbox_.maxy()));
     return mapnik::memory_datasource::features(q);
 }
예제 #5
0
mapnik::featureset_ptr geojson_datasource::features(mapnik::query const& q) const
{
    // if the query box intersects our world extent then query for features
    mapnik::box2d<double> const& b = q.get_bbox();
    if (extent_.intersects(b))
    {
        box_type box(point_type(b.minx(),b.miny()),point_type(b.maxx(),b.maxy()));
        return std::make_shared<geojson_featureset>(features_, tree_.find(box));
    }
    // otherwise return an empty featureset pointer
    return mapnik::featureset_ptr();
}
예제 #6
0
mapnik::featureset_ptr topojson_datasource::features(mapnik::query const& q) const
{
    // if the query box intersects our world extent then query for features
    mapnik::box2d<double> const& box = q.get_bbox();
    if (extent_.intersects(box))
    {
        topojson_featureset::array_type index_array;
        if (tree_)
        {
            tree_->query(boost::geometry::index::intersects(box),std::back_inserter(index_array));
            return std::make_shared<topojson_featureset>(topo_, *tr_, std::move(index_array));
        }
    }
    // otherwise return an empty featureset pointer
    return mapnik::featureset_ptr();
}
예제 #7
0
mapnik::featureset_ptr python_datasource::features(mapnik::query const& q) const
{
    try
    {
        // if the query box intersects our world extent then query for features
        if (envelope().intersects(q.get_bbox()))
        {
            ensure_gil lock;
            boost::python::object features(datasource_.attr("features")(q));
            // if 'None' was returned, return an empty feature set
            if(features.ptr() == boost::python::object().ptr())
            {
                return mapnik::featureset_ptr();
            }
            return std::make_shared<python_featureset>(features);
        }
        // otherwise return an empty featureset pointer
        return mapnik::featureset_ptr();
    }
    catch ( boost::python::error_already_set )
    {
        throw mapnik::datasource_exception(extractException());
    }
}
예제 #8
0
mapnik::featureset_ptr geojson_datasource::features(mapnik::query const& q) const
{
    // if the query box intersects our world extent then query for features
    mapnik::box2d<double> const& b = q.get_bbox();
    if (extent_.intersects(b))
    {
        box_type box(point_type(b.minx(),b.miny()),point_type(b.maxx(),b.maxy()));
#if BOOST_VERSION >= 105600
        geojson_featureset::array_type index_array;
        if (tree_)
        {
            tree_->query(boost::geometry::index::intersects(box),std::back_inserter(index_array));
            return std::make_shared<geojson_featureset>(features_, std::move(index_array));
        }
#else
        if (tree_)
        {
            return std::make_shared<geojson_featureset>(features_, tree_->find(box));
        }
#endif
    }
    // otherwise return an empty featureset pointer
    return mapnik::featureset_ptr();
}
예제 #9
0
feature_ptr gdal_featureset::get_feature(mapnik::query const& q)
{
    feature_ptr feature = feature_factory::create(ctx_,1);

    GDALRasterBand * red = 0;
    GDALRasterBand * green = 0;
    GDALRasterBand * blue = 0;
    GDALRasterBand * alpha = 0;
    GDALRasterBand * grey = 0;

    /*
#ifdef MAPNIK_LOG
      double tr[6];
      dataset_.GetGeoTransform(tr);

      const double dx = tr[1];
      const double dy = tr[5];
      MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: dx_=" << dx_ << " dx=" << dx << " dy_=" << dy_ << "dy=" << dy;
#endif
    */

    CoordTransform t(raster_width_, raster_height_, raster_extent_, 0, 0);
    box2d<double> intersect = raster_extent_.intersect(q.get_bbox());
    box2d<double> box = t.forward(intersect);

    //size of resized output pixel in source image domain
    double margin_x = 1.0 / (fabs(dx_) * boost::get<0>(q.resolution()));
    double margin_y = 1.0 / (fabs(dy_) * boost::get<1>(q.resolution()));
    if (margin_x < 1)
    {
        margin_x = 1.0;
    }
    if (margin_y < 1)
    {
        margin_y = 1.0;
    }

    //select minimum raster containing whole box
    int x_off = rint(box.minx() - margin_x);
    int y_off = rint(box.miny() - margin_y);
    int end_x = rint(box.maxx() + margin_x);
    int end_y = rint(box.maxy() + margin_y);

    //clip to available data
    if (x_off < 0)
    {
        x_off = 0;
    }
    if (y_off < 0)
    {
        y_off = 0;
    }
    if (end_x > (int)raster_width_)
    {
        end_x = raster_width_;
    }
    if (end_y > (int)raster_height_)
    {
        end_y = raster_height_;
    }
    int width = end_x - x_off;
    int height = end_y - y_off;

    // don't process almost invisible data
    if (box.width() < 0.5)
    {
        width = 0;
    }
    if (box.height() < 0.5)
    {
        height = 0;
    }

    //calculate actual box2d of returned raster
    box2d<double> feature_raster_extent(x_off, y_off, x_off + width, y_off + height);
    intersect = t.backward(feature_raster_extent);

    MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Raster extent=" << raster_extent_;
    MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: View extent=" << intersect;
    MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Query resolution=" << boost::get<0>(q.resolution()) << "," << boost::get<1>(q.resolution());
    MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: StartX=" << x_off << " StartY=" << y_off << " Width=" << width << " Height=" << height;

    if (width > 0 && height > 0)
    {
        double width_res = boost::get<0>(q.resolution());
        double height_res = boost::get<1>(q.resolution());
        int im_width = int(width_res * intersect.width() + 0.5);
        int im_height = int(height_res * intersect.height() + 0.5);

        // if layer-level filter_factor is set, apply it
        if (filter_factor_)
        {
            im_width *= filter_factor_;
            im_height *= filter_factor_;

            MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Applying layer filter_factor=" << filter_factor_;
        }
        // otherwise respect symbolizer level factor applied to query, default of 1.0
        else
        {
            double sym_downsample_factor = q.get_filter_factor();
            im_width *= sym_downsample_factor;
            im_height *= sym_downsample_factor;
        }

        // case where we need to avoid upsampling so that the
        // image can be later scaled within raster_symbolizer
        if (im_width >= width || im_height >= height)
        {
            im_width = width;
            im_height = height;
        }

        if (im_width > 0 && im_height > 0)
        {
            mapnik::raster_ptr raster = boost::make_shared<mapnik::raster>(intersect, im_width, im_height);
            feature->set_raster(raster);
            mapnik::image_data_32 & image = raster->data_;
            image.set(0xffffffff);

            MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Image Size=(" << im_width << "," << im_height << ")";
            MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Reading band=" << band_;

            if (band_ > 0) // we are querying a single band
            {
                if (band_ > nbands_)
                {
                    throw datasource_exception((boost::format("GDAL Plugin: '%d' is an invalid band, dataset only has '%d' bands\n") % band_ % nbands_).str());
                }

                float* imageData = (float*)image.getBytes();
                GDALRasterBand * band = dataset_.GetRasterBand(band_);
                int hasNoData(0);
                double nodata(0);
                if (nodata_value_)
                {
                    hasNoData = 1;
                    nodata = *nodata_value_;
                }
                else
                {
                    nodata = band->GetNoDataValue(&hasNoData);
                }
                band->RasterIO(GF_Read, x_off, y_off, width, height,
                               imageData, image.width(), image.height(),
                               GDT_Float32, 0, 0);

                if (hasNoData)
                {
                    feature->put("NODATA",nodata);
                }
            }
            else // working with all bands
            {
                for (int i = 0; i < nbands_; ++i)
                {
                    GDALRasterBand * band = dataset_.GetRasterBand(i + 1);

#ifdef MAPNIK_LOG
                    get_overview_meta(band);
#endif

                    GDALColorInterp color_interp = band->GetColorInterpretation();
                    switch (color_interp)
                    {
                    case GCI_RedBand:
                        red = band;

                        MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found red band";

                        break;
                    case GCI_GreenBand:
                        green = band;

                        MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found green band";

                        break;
                    case GCI_BlueBand:
                        blue = band;

                        MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found blue band";

                        break;
                    case GCI_AlphaBand:
                        alpha = band;

                        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;

                        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;
                            }
                        }
                        break;
                    }
                    case GCI_Undefined:
                        MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found undefined band (assumming gray band)";

                        grey = band;
                        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...";

                    int hasNoData = 0;
                    double nodata = 0.0;
                    if (nodata_value_)
                    {
                        hasNoData = 1;
                        nodata = *nodata_value_;
                    }
                    else
                    {
                        nodata = red->GetNoDataValue(&hasNoData);
                    }
                    if (hasNoData)
                    {
                        feature->put("NODATA",nodata);
                    }
                    GDALColorTable *color_table = red->GetColorTable();

                    if (! alpha && hasNoData && ! color_table)
                    {
                        // first read the data in and create an alpha channel from the nodata values
                        float* imageData = (float*)image.getBytes();
                        red->RasterIO(GF_Read, x_off, y_off, width, height,
                                      imageData, image.width(), image.height(),
                                      GDT_Float32, 0, 0);

                        int len = image.width() * image.height();

                        for (int i = 0; i < len; ++i)
                        {
                            if (nodata == imageData[i])
                            {
                                *reinterpret_cast<unsigned *>(&imageData[i]) = 0;
                            }
                            else
                            {
                                *reinterpret_cast<unsigned *>(&imageData[i]) = 0xFFFFFFFF;
                            }
                        }

                    }

                    red->RasterIO(GF_Read, x_off, y_off, width, height, image.getBytes() + 0,
                                  image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
                    green->RasterIO(GF_Read, x_off, y_off, width, height, image.getBytes() + 1,
                                    image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
                    blue->RasterIO(GF_Read, x_off, y_off, width, height, image.getBytes() + 2,
                                   image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
                }
                else if (grey)
                {
                    MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Processing gray band...";

                    int hasNoData(0);
                    double nodata(0);
                    if (nodata_value_)
                    {
                        hasNoData = 1;
                        nodata = *nodata_value_;
                    }
                    else
                    {
                        nodata = grey->GetNoDataValue(&hasNoData);
                    }
                    GDALColorTable* color_table = grey->GetColorTable();

                    if (hasNoData && ! color_table)
                    {
                        MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: No data value for layer=" << nodata;

                        feature->put("NODATA",nodata);
                        // first read the data in and create an alpha channel from the nodata values
                        float* imageData = (float*)image.getBytes();
                        grey->RasterIO(GF_Read, x_off, y_off, width, height,
                                       imageData, image.width(), image.height(),
                                       GDT_Float32, 0, 0);

                        int len = image.width() * image.height();

                        for (int i = 0; i < len; ++i)
                        {
                            if (nodata == imageData[i])
                            {
                                *reinterpret_cast<unsigned *>(&imageData[i]) = 0;
                            }
                            else
                            {
                                *reinterpret_cast<unsigned *> (&imageData[i]) = 0xFFFFFFFF;
                            }
                        }
                    }

                    grey->RasterIO(GF_Read, x_off, y_off, width, height, image.getBytes() + 0,
                                   image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
                    grey->RasterIO(GF_Read,x_off, y_off, width, height, image.getBytes() + 1,
                                   image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
                    grey->RasterIO(GF_Read,x_off, y_off, width, height, image.getBytes() + 2,
                                   image.width(), image.height(), GDT_Byte, 4, 4 * image.width());

                    if (color_table)
                    {
                        MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Loading colour table...";

                        unsigned nodata_value = static_cast<unsigned>(nodata);
                        if (hasNoData)
                        {
                            feature->put("NODATA",static_cast<int>(nodata_value));
                        }
                        for (unsigned y = 0; y < image.height(); ++y)
                        {
                            unsigned int* row = image.getRow(y);
                            for (unsigned x = 0; x < image.width(); ++x)
                            {
                                unsigned value = row[x] & 0xff;
                                if (hasNoData && (value == nodata_value))
                                {
                                    // make no data fully alpha
                                    row[x] = 0;
                                }
                                else
                                {
                                    const GDALColorEntry *ce = color_table->GetColorEntry(value);
                                    if (ce)
                                    {
                                        // TODO - big endian support
                                        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...";

                    alpha->RasterIO(GF_Read, x_off, y_off, width, height, image.getBytes() + 3,
                                    image.width(), image.height(), GDT_Byte, 4, 4 * image.width());
                }
            }
            return feature;
        }
    }
    return feature_ptr();
}
예제 #10
0
feature_ptr gdal_featureset::get_feature(mapnik::query const& q)
{
    feature_ptr feature = feature_factory::create(ctx_,1);
    int raster_has_nodata = 0;
    double raster_nodata = 0;
    GDALRasterBand * red = 0;
    GDALRasterBand * green = 0;
    GDALRasterBand * blue = 0;
    GDALRasterBand * alpha = 0;
    GDALRasterBand * grey = 0;
    CPLErr raster_io_error = CE_None;

    /*
#ifdef MAPNIK_LOG
      double tr[6];
      dataset_.GetGeoTransform(tr);

      const double dx = tr[1];
      const double dy = tr[5];
      MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: dx_=" << dx_ << " dx=" << dx << " dy_=" << dy_ << "dy=" << dy;
#endif
    */

    view_transform t(raster_width_, raster_height_, raster_extent_, 0, 0);
    box2d<double> intersect = raster_extent_.intersect(q.get_bbox());
    box2d<double> box = t.forward(intersect);

    //size of resized output pixel in source image domain
    double margin_x = 1.0 / (std::fabs(dx_) * std::get<0>(q.resolution()));
    double margin_y = 1.0 / (std::fabs(dy_) * std::get<1>(q.resolution()));
    if (margin_x < 1)
    {
        margin_x = 1.0;
    }
    if (margin_y < 1)
    {
        margin_y = 1.0;
    }

    //select minimum raster containing whole box
    int x_off = rint(box.minx() - margin_x);
    int y_off = rint(box.miny() - margin_y);
    int end_x = rint(box.maxx() + margin_x);
    int end_y = rint(box.maxy() + margin_y);

    //clip to available data
    if (x_off < 0)
    {
        x_off = 0;
    }
    if (y_off < 0)
    {
        y_off = 0;
    }
    if (end_x > (int)raster_width_)
    {
        end_x = raster_width_;
    }
    if (end_y > (int)raster_height_)
    {
        end_y = raster_height_;
    }
    int width = end_x - x_off;
    int height = end_y - y_off;

    // don't process almost invisible data
    if (box.width() < 0.5)
    {
        width = 0;
    }
    if (box.height() < 0.5)
    {
        height = 0;
    }

    //calculate actual box2d of returned raster
    box2d<double> feature_raster_extent(x_off, y_off, x_off + width, y_off + height);
    intersect = t.backward(feature_raster_extent);

    MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Raster extent=" << raster_extent_;
    MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: View extent=" << intersect;
    MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Query resolution=" << std::get<0>(q.resolution()) << "," << std::get<1>(q.resolution());
    MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: StartX=" << x_off << " StartY=" << y_off << " Width=" << width << " Height=" << height;

    if (width > 0 && height > 0)
    {
        double width_res = std::get<0>(q.resolution());
        double height_res = std::get<1>(q.resolution());
        int im_width = int(width_res * intersect.width() + 0.5);
        int im_height = int(height_res * intersect.height() + 0.5);

        double filter_factor = q.get_filter_factor();
        im_width = int(im_width * filter_factor + 0.5);
        im_height = int(im_height * filter_factor + 0.5);

        // case where we need to avoid upsampling so that the
        // image can be later scaled within raster_symbolizer
        if (im_width >= width || im_height >= height)
        {
            im_width = width;
            im_height = height;
        }

        if (im_width > 0 && im_height > 0)
        {
            MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Image Size=(" << im_width << "," << im_height << ")";
            MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Reading band=" << band_;
            if (band_ > 0) // we are querying a single band
            {
                GDALRasterBand * band = dataset_.GetRasterBand(band_);
                if (band_ > nbands_)
                {
                    std::ostringstream s;
                    s << "GDAL Plugin: " << band_ << " is an invalid band, dataset only has " << nbands_ << "bands";
                    throw datasource_exception(s.str());
                }
                GDALDataType band_type = band->GetRasterDataType();
                switch (band_type)
                {
                case GDT_Byte:
                {
                    mapnik::image_gray8 image(im_width, im_height);
                    image.set(std::numeric_limits<std::uint8_t>::max());
                    raster_nodata = band->GetNoDataValue(&raster_has_nodata);
                    raster_io_error = band->RasterIO(GF_Read, x_off, y_off, width, height,
                                                     image.data(), image.width(), image.height(),
                                                     GDT_Byte, 0, 0);
                    if (raster_io_error == CE_Failure)
                    {
                        throw datasource_exception(CPLGetLastErrorMsg());
                    }
                    mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(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);
                    break;
                }
                case GDT_Float64:
                case GDT_Float32:
                {
                    mapnik::image_gray32f image(im_width, im_height);
                    image.set(std::numeric_limits<float>::max());
                    raster_nodata = band->GetNoDataValue(&raster_has_nodata);
                    raster_io_error = band->RasterIO(GF_Read, x_off, y_off, width, height,
                                                     image.data(), image.width(), image.height(),
                                                     GDT_Float32, 0, 0);
                    if (raster_io_error == CE_Failure)
                    {
                        throw datasource_exception(CPLGetLastErrorMsg());
                    }
                    mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(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);
                    break;
                }
                case GDT_UInt16:
                {
                    mapnik::image_gray16 image(im_width, im_height);
                    image.set(std::numeric_limits<std::uint16_t>::max());
                    raster_nodata = band->GetNoDataValue(&raster_has_nodata);
                    raster_io_error = band->RasterIO(GF_Read, x_off, y_off, width, height,
                                                     image.data(), image.width(), image.height(),
                                                     GDT_UInt16, 0, 0);
                    if (raster_io_error == CE_Failure)
                    {
                        throw datasource_exception(CPLGetLastErrorMsg());
                    }
                    mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(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);
                    break;
                }
                default:
                case GDT_Int16:
                {
                    mapnik::image_gray16s image(im_width, im_height);
                    image.set(std::numeric_limits<std::int16_t>::max());
                    raster_nodata = band->GetNoDataValue(&raster_has_nodata);
                    raster_io_error = band->RasterIO(GF_Read, x_off, y_off, width, height,
                                                     image.data(), image.width(), image.height(),
                                                     GDT_Int16, 0, 0);
                    if (raster_io_error == CE_Failure)
                    {
                        throw datasource_exception(CPLGetLastErrorMsg());
                    }
                    mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(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);
                    break;
                }
                }
            }
            else // working with all bands
            {
                mapnik::image_rgba8 image(im_width, im_height);
                image.set(std::numeric_limits<std::uint32_t>::max());
                for (int i = 0; i < nbands_; ++i)
                {
                    GDALRasterBand * band = dataset_.GetRasterBand(i + 1);
#ifdef MAPNIK_LOG
                    get_overview_meta(band);
#endif
                    GDALColorInterp color_interp = band->GetColorInterpretation();
                    switch (color_interp)
                    {
                    case GCI_RedBand:
                        red = band;
                        MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found red band";
                        break;
                    case GCI_GreenBand:
                        green = band;
                        MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found green band";
                        break;
                    case GCI_BlueBand:
                        blue = band;
                        MAPNIK_LOG_DEBUG(gdal) << "gdal_featureset: Found blue band";
                        break;
                    case GCI_AlphaBand:
                        alpha = band;
                        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 != NULL && alpha->GetBand() == 4 && !raster_has_nodata )
                        {
                            nBandsToRead = 4;
                            alpha = NULL; // 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, NULL,
                                                            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)
                    {
                        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";
                    }
                }
                mapnik::raster_ptr raster = std::make_shared<mapnik::raster>(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();
}
mapnik::featureset_ptr rasterizer_datasource::features(const mapnik::query& q) const
{
	std::clog << "Rasterizer::features"
			<< ", resolution_type=(" << q.resolution().head << "," << q.resolution().tail.head << ")"
			<< ", scale_denominator=" << q.scale_denominator()
			<< ", bbox=[" << q.get_bbox().minx() << "," << q.get_bbox().miny() << "," << q.get_bbox().maxx() << "," << q.get_bbox().maxy() << "]"
			<< std::endl;

	double	resx=q.resolution().head,
			resy=q.resolution().tail.head,
			bbox_width=q.get_bbox().width(),
			bbox_height=q.get_bbox().height();

	int 	pixel_width=round(bbox_width * resx),
			pixel_height=round(bbox_height * resy);

	if (pixel_width<=0 || pixel_height<=0) {
		std::clog << "Illegal rasterizer display metrics" << std::endl;
		return mapnik::featureset_ptr();
	}

	std::clog << "Rasterizer generating image of size (" << pixel_width << "," << pixel_height << ")" << std::endl;

	// Setup for render
	mapnik::feature_ptr feature(mapnik::feature_factory::create(1));
	mapnik::image_data_32 image(pixel_width, pixel_height);
	rasterize_params params(q, image);

	rasterize(params);

	// Prepare and return the raster feature
	feature->set_raster(boost::make_shared<mapnik::raster>(q.get_bbox(), image));
	return boost::make_shared<singleton_featureset>(singleton_featureset(feature));
}
feature_ptr rasterlite_featureset::get_feature(mapnik::query const& q)
{
#ifdef MAPNIK_DEBUG
   std::clog << "Rasterlite Plugin: get_feature" << "\n";
#endif

   feature_ptr feature(new Feature(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());

   int width = static_cast<int>(q.resolution() * intersect.width() + 0.5);
   int height = static_cast<int>(q.resolution() * intersect.height() + 0.5);

   double pixel_size = (intersect.width() >= intersect.height()) ?
       (intersect.width() / (double) width) : (intersect.height() / (double) height);

#ifdef MAPNIK_DEBUG         
   std::clog << "Rasterlite Plugin: Raster extent=" << raster_extent << "\n";
   std::clog << "Rasterlite Plugin: View extent=" << q.get_bbox() << "\n";
   std::clog << "Rasterlite Plugin: Intersect extent=" << intersect << "\n";
   std::clog << "Rasterlite Plugin: Query resolution=" << q.resolution() << "\n";
   std::clog << "Rasterlite Plugin: Size=" << width << " " << height << "\n";
   std::clog << "Rasterlite Plugin: Pixel Size=" << pixel_size << "\n";
#endif

   if (width > 0 && height > 0)
   {
      int size;
      void *raster;

      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(mapnik::raster_ptr(new mapnik::raster(intersect,image)));

              free (raster);

#ifdef MAPNIK_DEBUG         
              std::clog << "Rasterlite Plugin: Done" << "\n";
#endif
          }
          else
          {
#ifdef MAPNIK_DEBUG         
              std::clog << "Rasterlite Plugin: Error=" << rasterliteGetLastError (dataset_) << "\n";
#endif
          }
      }
      
      return feature;
   }
   return feature_ptr();
}
feature_ptr gdal_featureset::get_feature(mapnik::query const& q)
{
    feature_ptr feature(new Feature(1));

    GDALRasterBand * red = 0;
    GDALRasterBand * green = 0;
    GDALRasterBand * blue = 0;
    GDALRasterBand * alpha = 0;
    GDALRasterBand * grey = 0; 
   
    /*
    double tr[6];
    dataset_.GetGeoTransform(tr);
    
    double dx = tr[1];
    double dy = tr[5];
    std::clog << "dx_: " << dx_ << " dx: " << dx << " dy_: " << dy_ << "dy: " << dy << "\n";
    */
          
    CoordTransform t(raster_width_,raster_height_,raster_extent_,0,0);
    box2d<double> intersect = raster_extent_.intersect(q.get_bbox());
    box2d<double> box = t.forward(intersect);

    //size of resized output pixel in source image domain
    double margin_x = 1.0/(fabs(dx_)*boost::get<0>(q.resolution()));
    double margin_y = 1.0/(fabs(dy_)*boost::get<1>(q.resolution()));
    if (margin_x < 1)
        margin_x = 1.0;
    if (margin_y < 1)
        margin_y = 1.0;
    //select minimum raster containing whole box
    int x_off = rint(box.minx() - margin_x);
    int y_off = rint(box.miny() - margin_y);
    int end_x = rint(box.maxx() + margin_x);
    int end_y = rint(box.maxy() + margin_y);
    //clip to available data
    if (x_off < 0)
        x_off = 0;
    if (y_off < 0)
        y_off = 0;
    if (end_x > (int)raster_width_)
        end_x = raster_width_;
    if (end_y > (int)raster_height_)
        end_y = raster_height_;
    int width = end_x - x_off;
    int height = end_y - y_off;
    // don't process almost invisible data
    if (box.width() < 0.5)
        width = 0;
    if (box.height() < 0.5)
        height = 0;
    //calculate actual box2d of returned raster
    box2d<double> feature_raster_extent(x_off, y_off, x_off+width, y_off+height); 
    intersect = t.backward(feature_raster_extent);
    
#ifdef MAPNIK_DEBUG         
    std::clog << "GDAL Plugin: Raster extent=" << raster_extent_ << std::endl;
    std::clog << "GDAL Plugin: View extent=" << intersect << std::endl;
    std::clog << "GDAL Plugin: Query resolution=" << boost::get<0>(q.resolution()) << "," << boost::get<1>(q.resolution()) << std::endl;
    std::clog << boost::format("GDAL Plugin: StartX=%d StartY=%d Width=%d Height=%d") % x_off % y_off % width % height << std::endl;
#endif
   
    if (width > 0 && height > 0)
    {
        double width_res = boost::get<0>(q.resolution());
        double height_res = boost::get<1>(q.resolution());
        int im_width = int(width_res * intersect.width() + 0.5);
        int im_height = int(height_res * intersect.height() + 0.5);
        
        // if layer-level filter_factor is set, apply it
        if (filter_factor_)
        {
            im_width *= filter_factor_;
            im_height *= filter_factor_;
        }
        // otherwise respect symbolizer level factor applied to query, default of 1.0
        else
        {
            double sym_downsample_factor = q.get_filter_factor();
            im_width *= sym_downsample_factor;
            im_height *= sym_downsample_factor;
        }

        // case where we need to avoid upsampling so that the
        // image can be later scaled within raster_symbolizer 
        if (im_width >= width || im_height >= height)
        {
            im_width = width;
            im_height = height;
        }

        if (im_width > 0 && im_height > 0)
        {
            mapnik::image_data_32 image(im_width, im_height);
            image.set(0xffffffff); 
             
#ifdef MAPNIK_DEBUG
            std::clog << "GDAL Plugin: Image Size=(" << im_width << "," << im_height << ")" << std::endl;
            std::clog << "GDAL Plugin: Reading band " << band_ << std::endl;
#endif
            typedef std::vector<int,int> pallete;
        
            if (band_ > 0) // we are querying a single band
            {
                if (band_ > nbands_)
                    throw datasource_exception((boost::format("GDAL Plugin: '%d' is an invalid band, dataset only has '%d' bands\n") % band_ % nbands_).str());
                float *imageData = (float*)image.getBytes();
                GDALRasterBand * band = dataset_.GetRasterBand(band_);
                band->RasterIO(GF_Read, x_off, y_off, width, height,
                               imageData, image.width(), image.height(),
                               GDT_Float32, 0, 0);
    
                feature->set_raster(mapnik::raster_ptr(new mapnik::raster(intersect,image)));
            }
          
            else // working with all bands
            {
                for (int i = 0; i < nbands_; ++i)
                {
                    GDALRasterBand * band = dataset_.GetRasterBand(i+1);
             
#ifdef MAPNIK_DEBUG
                    get_overview_meta(band);  
#endif
    
                    GDALColorInterp color_interp = band->GetColorInterpretation();
                    switch (color_interp)
                    {
                    case GCI_RedBand:
                        red = band;
#ifdef MAPNIK_DEBUG
                        std::clog << "GDAL Plugin: Found red band" << std::endl;
#endif
                        break;
                    case GCI_GreenBand:
                        green = band;
#ifdef MAPNIK_DEBUG
                        std::clog << "GDAL Plugin: Found green band" << std::endl;
#endif
                        break;
                    case GCI_BlueBand:
                        blue = band;
#ifdef MAPNIK_DEBUG
                        std::clog << "GDAL Plugin: Found blue band" << std::endl;
#endif
                        break;
                    case GCI_AlphaBand:
                        alpha = band;
#ifdef MAPNIK_DEBUG
                        std::clog << "GDAL Plugin: Found alpha band" << std::endl;
#endif
                        break;
                    case GCI_GrayIndex:
                        grey = band;
#ifdef MAPNIK_DEBUG
                        std::clog << "GDAL Plugin: Found gray band" << std::endl;
#endif
                        break;
                    case GCI_PaletteIndex:
                    {
                        grey = band;
#ifdef MAPNIK_DEBUG
                        std::clog << "GDAL Plugin: Found gray band, and colortable..." << std::endl;
#endif
                        GDALColorTable *color_table = band->GetColorTable();
                
                        if ( color_table)
                        {
                            int count = color_table->GetColorEntryCount();
#ifdef MAPNIK_DEBUG
                            std::clog << "GDAL Plugin: Color Table count = " << count << std::endl;
#endif 
                            for (int j = 0; j < count; j++)
                            {
                                const GDALColorEntry *ce = color_table->GetColorEntry (j);
                                if (! ce) continue;
#ifdef MAPNIK_DEBUG
                                std::clog << "GDAL Plugin: Color entry RGB (" << ce->c1 << "," <<ce->c2 << "," << ce->c3 << ")" << std::endl; 
#endif
                            }
                        }
                        break;
                    }
                    case GCI_Undefined:
#ifdef MAPNIK_DEBUG
                        std::clog << "GDAL Plugin: Found undefined band (assumming gray band)" << std::endl;
#endif
                        grey = band;
                        break;
                    default:
#ifdef MAPNIK_DEBUG
                        std::clog << "GDAL Plugin: band type unknown!" << std::endl;
#endif
                        break;
                    }
                }
    
                if (red && green && blue)
                {
#ifdef MAPNIK_DEBUG
                    std::clog << "GDAL Plugin: processing rgb bands..." << std::endl;
#endif
                    red->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 0,
                                  image.width(),image.height(),GDT_Byte,4,4*image.width());
                    green->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 1,
                                    image.width(),image.height(),GDT_Byte,4,4*image.width());
                    blue->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 2,
                                   image.width(),image.height(),GDT_Byte,4,4*image.width());
                }
                else if (grey)
                {
#ifdef MAPNIK_DEBUG
                    std::clog << "GDAL Plugin: processing gray band..." << std::endl;
#endif
                    // TODO : apply colormap if present
                
                    grey->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 0,
                                   image.width(),image.height(),GDT_Byte, 4, 4 * image.width());
                    grey->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 1,
                                   image.width(),image.height(),GDT_Byte, 4, 4 * image.width());
                    grey->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 2,
                                   image.width(),image.height(),GDT_Byte, 4, 4 * image.width());
                }
    
                if (alpha)
                {
#ifdef MAPNIK_DEBUG
                    std::clog << "GDAL Plugin: processing alpha band..." << std::endl;
#endif
                    alpha->RasterIO(GF_Read,x_off,y_off,width,height,image.getBytes() + 3,
                                    image.width(),image.height(),GDT_Byte,4,4*image.width());
                }
    
                feature->set_raster(mapnik::raster_ptr(new mapnik::raster(intersect,image)));
            }
            return feature;
        }
    }
    return feature_ptr();
}