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();
}
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();
}
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();
}
