/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2005-2008, Open Source Geospatial Foundation (OSGeo)
*
* 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;
* version 2.1 of the License.
*
* 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.
*/
package org.geotools.renderer.lite.gridcoverage2d;
import java.awt.image.DataBuffer;
import java.awt.image.IndexColorModel;
import java.awt.image.RenderedImage;
import java.awt.image.SampleModel;
import org.geotools.coverage.GridSampleDimension;
import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverage.grid.GridGeometry2D;
import org.geotools.factory.Hints;
import org.geotools.image.ImageWorker;
import org.geotools.renderer.i18n.Vocabulary;
import org.geotools.renderer.i18n.VocabularyKeys;
import org.geotools.resources.coverage.CoverageUtilities;
import org.geotools.styling.ChannelSelection;
import org.geotools.styling.ColorMap;
import org.geotools.styling.ContrastEnhancement;
import org.geotools.styling.RasterSymbolizer;
import org.geotools.styling.StyleVisitor;
import org.geotools.util.SimpleInternationalString;
import org.opengis.coverage.grid.GridCoverage;
/**
* A helper class for rendering {@link GridCoverage} objects. It supports almost
* all RasterSymbolizer options.
*
* @author Simone Giannecchini, GeoSolutions
*
*
* @source $URL$
*/
public class RasterSymbolizerHelper extends
SubchainStyleVisitorCoverageProcessingAdapter implements StyleVisitor {
/**
* We are hacking here a solutions for whenever the user either did not
* specify a style or did specify a bad one and the resulting image seems
* not be drawable.
* @return {@link GridCoverage2D} the result of this operation
*/
public synchronized GridCoverage2D execute() {
///////////////////////////////////////////////////////////////////////
//
// We get the geophysics view of this coverage and we check if we give away
// something that can visualized directly. If the final data type is still floating
// point numbers (no direct rendering) we do our best to cope with it doing a local
//
///////////////////////////////////////////////////////////////////////
//get the output coverage and its RenderedImage
final GridCoverage2D output= (GridCoverage2D) super.execute();
// final GridCoverage2D outputNonGeo=output.geophysics(false);
// //if we have an index color model we are ok, this way we preserve the non geo view or whatever it is now called
// if(outputNonGeo.getRenderedImage().getColorModel() instanceof IndexColorModel)
// return output;
RenderedImage outputImage=output.getRenderedImage();
///////////////////////////////////////////////////////////////////////
//
// We are in the more general case hence it might be that we have
// an image with too many bands and a bogus color space or an image with
// a data type that is not drawable itself. We have to try and do our
// best in order to show something as quickly as possible.
//
///////////////////////////////////////////////////////////////////////
//let's check the number of bands
final SampleModel outputImageSampleModel= outputImage.getSampleModel();
final int numBands=outputImageSampleModel.getNumBands();
final int dataType= outputImageSampleModel.getDataType();
final GridSampleDimension sd[];
if(numBands>4)
{
//get the visible band
final int visibleBand=CoverageUtilities.getVisibleBand(outputImage);
outputImage=
new ImageWorker(outputImage).setRenderingHints(this.getHints()).retainBands(new int[]{visibleBand}).getRenderedImage();
sd=new GridSampleDimension[]{(GridSampleDimension) output.getSampleDimension(visibleBand)};
}
else
sd=output.getSampleDimensions();
//more general case, let's check the data type and let go only USHORT and BYTE
// TODO I am not sure this will work with multipacked types (using INT for an RGB as an instance)
// TODO should we go to component color model also?
// TODO use JAI TOOLS statistics and ignore no data properly.
switch(dataType){
case DataBuffer.TYPE_DOUBLE:
case DataBuffer.TYPE_FLOAT:
case DataBuffer.TYPE_INT:
case DataBuffer.TYPE_SHORT:
//rescale to byte
outputImage=
new ImageWorker(outputImage).setRenderingHints(this.getHints()).rescaleToBytes().getRenderedImage();
}
//create a new grid coverage but preserve as much input as possible
return this.getCoverageFactory().create(output.getName(), outputImage,(GridGeometry2D)output.getGridGeometry(),sd, new GridCoverage[]{output},output.getProperties());
}
/**
*
* @param sourceCoverage
* @param hints
*/
public RasterSymbolizerHelper(GridCoverage2D sourceCoverage, Hints hints) {
super(
1,
hints,
SimpleInternationalString.wrap(Vocabulary.format(VocabularyKeys.RASTER_SYMBOLIZER_HELPER)),
SimpleInternationalString
.wrap("Simple Coverage Processing Node for RasterSymbolizerHelper"));
// add a source that will just give me back my gridcoverage
this.addSource(new RootNode(sourceCoverage, hints));
}
/*
* (non-Javadoc)
*
* @see org.geotools.renderer.lite.gridcoverage2d.StyleVisitorAdapter#visit(org.geotools.styling.RasterSymbolizer)
*/
public synchronized void visit(RasterSymbolizer rs) {
ColorMapUtilities.ensureNonNull("RasterSymbolizer", rs);
// /////////////////////////////////////////////////////////////////////
//
// Create the various nodes we'll use for executing this
// RasterSymbolizer
//
// /////////////////////////////////////////////////////////////////////
// the source node for the internal chains
// final RootNode sourceNode = new RootNode(sourceCoverage, adopt,
// hints);
final ChannelSelectionNode csNode = new ChannelSelectionNode();
final ColorMapNode cmNode = new ColorMapNode(this.getHints());
final ContrastEnhancementNode ceNode = new ContrastEnhancementNode(this.getHints());
setSink(ceNode);
// /////////////////////////////////////////////////////////////////////
//
// CHANNEL SELECTION
//
// /////////////////////////////////////////////////////////////////////
final ChannelSelection cs = rs.getChannelSelection();
csNode.addSource(this.getSource(0));
csNode.addSink(cmNode);
csNode.visit(cs);
// /////////////////////////////////////////////////////////////////////
//
// COLOR MAP
//
// /////////////////////////////////////////////////////////////////////
final ColorMap cm = rs.getColorMap();
cmNode.addSource(csNode);
csNode.addSink(cmNode);
cmNode.visit(cm);
// /////////////////////////////////////////////////////////////////////
//
// CONTRAST ENHANCEMENT
//
// /////////////////////////////////////////////////////////////////////
final ContrastEnhancement ce = rs.getContrastEnhancement();
ceNode.addSource(cmNode);
cmNode.addSink(ceNode);
ceNode.visit(ce);
//
// //
// /////////////////////////////////////////////////////////////////////
// //
// // OPACITY
// //
// //
// /////////////////////////////////////////////////////////////////////
// final Expression op = rs.getOpacity();
// if (op != null) {
// final Number number = (Number) op.evaluate(null, Float.class);
// if (number != null) {
// opacity = number.floatValue();
// }
// }
}
}