gvsig-raster / org.gvsig.raster / branches / org.gvsig.raster_dataaccess_refactoring / org.gvsig.raster.lib / org.gvsig.raster.lib.impl / src / main / java / org / gvsig / raster / impl / provider / tile / TileDownloaderForFiles.java @ 2236
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/* gvSIG. Geographic Information System of the Valencian Government
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*
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* Copyright (C) 2007-2008 Infrastructures and Transports Department
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* of the Valencian Government (CIT)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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package org.gvsig.raster.impl.provider.tile; |
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import java.io.IOException; |
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import org.gvsig.fmap.dal.coverage.RasterLocator; |
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import org.gvsig.fmap.dal.coverage.dataset.Buffer; |
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import org.gvsig.fmap.dal.coverage.datastruct.BandList; |
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import org.gvsig.fmap.dal.coverage.datastruct.Extent; |
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import org.gvsig.fmap.dal.coverage.exception.NotSupportedExtensionException; |
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import org.gvsig.fmap.dal.coverage.exception.ProcessInterruptedException; |
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import org.gvsig.fmap.dal.coverage.exception.QueryException; |
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import org.gvsig.fmap.dal.coverage.exception.RasterDriverException; |
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import org.gvsig.fmap.dal.coverage.store.RasterDataStore; |
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import org.gvsig.fmap.dal.coverage.store.RasterQuery; |
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import org.gvsig.fmap.dal.coverage.store.props.ColorInterpretation; |
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import org.gvsig.raster.cache.tile.Tile; |
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import org.gvsig.raster.cache.tile.exception.TileGettingException; |
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import org.gvsig.raster.cache.tile.provider.CacheStruct; |
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import org.gvsig.raster.impl.DefaultRasterManager; |
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import org.gvsig.raster.impl.datastruct.ExtentImpl; |
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/**
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* Tile getter
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public class TileDownloaderForFiles extends BaseTileDownloader { |
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private CacheStruct struct = null; |
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private String extension = null; |
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public TileDownloaderForFiles(RasterDataStore store,
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CacheStruct struct, |
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int tileWidth,
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int tileHeight,
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String extension) {
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super(store, tileWidth, tileHeight);
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this.struct = struct;
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this.extension = extension;
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} |
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public synchronized Tile downloadTile(Tile tile) throws TileGettingException { |
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Extent tileExtent = new ExtentImpl(tile.getUl(), tile.getLr());
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ColorInterpretation ci = store.getColorInterpretation(); |
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//Escribe todas las bandas a disco
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BandList newBandList = store.getDefaultBandList();//createBandList(prov);
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Buffer bufResult = null; |
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double pixelSize = struct.getPixelSizeByLevel(tile.getLevel());
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try {
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Extent ex = store.getExtent().intersection(tileExtent); |
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//newBuf ser?n distintas de tilePx cuando haya zonas con valores no data. Las de los bordes
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int newBufWidth = (int)Math.ceil((ex.width() * this.tilePxWidth) / tileExtent.width()); |
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int newBufHeight = (int)Math.ceil((ex.height() * this.tilePxHeight) / tileExtent.height()); |
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boolean alphaBand = false; |
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int nBandsBuffer = store.getBandCount();
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if(store.getColorInterpretation().hasAlphaBand())
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alphaBand = true;
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//Si no hay parte del tile que cae fuera de la imagen no se usa una nueva banda de transparencia ni valores nodata
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if(newBufHeight == this.tilePxHeight && newBufWidth == this.tilePxWidth) { |
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bufResult = readSupersampledBuffer(tileExtent, newBandList, this.tilePxWidth, this.tilePxHeight, nBandsBuffer); |
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if(bufResult == null) { |
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RasterQuery q = RasterLocator.getManager().createQuery(); |
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q.setAreaOfInterest(tileExtent, this.tilePxWidth, this.tilePxHeight); |
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q.setAdjustToExtent(true);
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bufResult = store.query(q); |
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} |
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} else {
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//Hay parte del tile que cae fuera de la imagen
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if(store.getDataType()[0] == Buffer.TYPE_BYTE) { |
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//Para imagenes byte se crea una banda de transparencia
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alphaBand = true;
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if(!store.getColorInterpretation().hasAlphaBand())
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nBandsBuffer ++; |
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} |
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Buffer smallBuf = readSupersampledBuffer(ex, newBandList, newBufWidth, newBufHeight, nBandsBuffer);
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if(smallBuf == null) { //No ha habido resampleo |
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RasterQuery q = RasterLocator.getManager().createQuery(); |
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q.setAreaOfInterest(ex, newBufWidth, newBufHeight); |
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q.setAllDrawableBands(); |
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q.setAdjustToExtent(true);
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smallBuf = store.query(q); |
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} |
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bufResult = buildTileBuffer(nBandsBuffer, this.tilePxWidth, this.tilePxHeight); |
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RasterLocator.getManager().getRasterUtils().copyToBuffer( |
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bufResult, |
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tileExtent, |
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smallBuf, |
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ex, |
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pixelSize, |
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store.getColorInterpretation().hasAlphaBand()); |
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} |
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saveTile(bufResult, pixelSize, extension, alphaBand, tile, tileExtent, ci); |
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//Si borramos el rmf no se puede leer la etiqueta Alpha. En caso de que se modifique jgdal para
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//poder guardar esta etiqueta deberiamos borrar el rmf para ahorrar ficheros
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//File rmf = new File(tile.getFile().getAbsolutePath() + ".rmf");
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//if(rmf.exists())
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//rmf.delete();
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} catch (ProcessInterruptedException e) {
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} catch (RasterDriverException e) {
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throw new TileGettingException(e); |
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} catch (NotSupportedExtensionException e) {
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throw new TileGettingException(e); |
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} catch (IOException e) { |
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throw new TileGettingException(e); |
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} catch (QueryException e) {
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throw new TileGettingException(e); |
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} |
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readTileFromDisk(tile); |
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return tile;
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} |
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/**
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* When the buffer of the request is greater than the original raster (> scale 1:1) then the request
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* has to be resampled.
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* @param tileExtent
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* @param newBandList
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* @param bufWidth
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* @param bufHeight
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* @param nBands
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* @return
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* @throws ProcessInterruptedException
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* @throws TileGettingException
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*/
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private Buffer readSupersampledBuffer(Extent tileExtent, BandList newBandList, int bufWidth, int bufHeight, int nBands) throws ProcessInterruptedException, TileGettingException { |
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int widthImgPx = (int)Math.abs(tileExtent.width() / store.getPixelSizeX()); |
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int heightImgPx = (int)Math.abs(tileExtent.height() / store.getPixelSizeY()); |
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boolean supersampling = ((bufWidth > widthImgPx) || (bufHeight > heightImgPx)) ? true : false; |
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if(supersampling) {
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RasterQuery q = RasterLocator.getManager().createQuery(); |
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q.setAreaOfInterest(tileExtent, widthImgPx, heightImgPx); |
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q.setAllDrawableBands(); |
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q.setAdjustToExtent(true);
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Buffer buf = null; |
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try {
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buf = store.query(q); |
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} catch (QueryException e) {
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throw new TileGettingException(e); |
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} |
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Buffer result = buf.getAdjustedWindow(bufWidth, bufHeight, Buffer.INTERPOLATION_NearestNeighbour); |
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if(result != buf)
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buf.dispose(); |
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return result;
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} |
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return null; |
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} |
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/**
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* Builds a buffer using the specified number of bands and initialize it
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* @param nbands
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* @return
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*/
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private Buffer buildTileBuffer(int nbands, int w, int h) { |
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Buffer bufResult = DefaultRasterManager.getInstance().createMemoryBuffer(store.getDataType()[0], w, h, nbands, true); |
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if(store.getDataType()[0] != Buffer.TYPE_BYTE) { |
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for (int i = 0; i < bufResult.getBandCount(); i++) { |
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clearMaskBuffer(bufResult, i); |
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} |
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} else
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clearMaskBuffer(bufResult, nbands - 1);
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return bufResult;
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} |
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} |