jiayuasu commented on code in PR #2673: URL: https://github.com/apache/sedona/pull/2673#discussion_r2851273580
########## common/src/main/java/org/apache/sedona/common/raster/TileGenerator.java: ########## @@ -0,0 +1,270 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +package org.apache.sedona.common.raster; + +import java.awt.Rectangle; +import java.awt.image.Raster; +import java.awt.image.RenderedImage; +import java.awt.image.WritableRaster; +import java.util.Iterator; +import java.util.NoSuchElementException; +import javax.media.jai.RasterFactory; +import org.apache.sedona.common.utils.ImageUtils; +import org.apache.sedona.common.utils.RasterUtils; +import org.geotools.api.metadata.spatial.PixelOrientation; +import org.geotools.api.referencing.datum.PixelInCell; +import org.geotools.coverage.GridSampleDimension; +import org.geotools.coverage.grid.GridCoverage2D; +import org.geotools.coverage.grid.GridEnvelope2D; +import org.geotools.coverage.grid.GridGeometry2D; +import org.geotools.referencing.operation.transform.AffineTransform2D; + +public class TileGenerator { + + public static class Tile { + + private final int tileX; + private final int tileY; + private final GridCoverage2D coverage; + + public Tile(int tileX, int tileY, GridCoverage2D coverage) { + this.tileX = tileX; + this.tileY = tileY; + this.coverage = coverage; + } + + public int getTileX() { + return tileX; + } + + public int getTileY() { + return tileY; + } + + public GridCoverage2D getCoverage() { + return coverage; + } + } + + /** + * Generate tiles from an in-db grid coverage. The generated tiles are also in-db grid coverages. + * Pixel data will be copied into the tiles one tile at a time via a lazy iterator. + * + * @param gridCoverage2D the in-db grid coverage + * @param bandIndices the indices of the bands to select (1-based) + * @param tileWidth the width of the tiles + * @param tileHeight the height of the tiles + * @param padWithNoData whether to pad the tiles with no data value + * @param padNoDataValue the no data value for padded tiles, only used when padWithNoData is true. + * If the value is NaN, the no data value of the original band will be used. + * @return a lazy iterator of tiles + */ + public static InDbTileIterator generateInDbTiles( + GridCoverage2D gridCoverage2D, + int[] bandIndices, + int tileWidth, + int tileHeight, + boolean padWithNoData, + double padNoDataValue) { + return new InDbTileIterator( + gridCoverage2D, bandIndices, tileWidth, tileHeight, padWithNoData, padNoDataValue); + } + + public abstract static class TileIterator implements Iterator<Tile> { + protected final GridCoverage2D gridCoverage2D; + protected int numTileX; + protected int numTileY; + protected int tileX; + protected int tileY; + protected boolean autoDisposeSource = false; + protected Runnable disposeFunction = null; + + TileIterator(GridCoverage2D gridCoverage2D) { + this.gridCoverage2D = gridCoverage2D; + } + + protected void initialize(int numTileX, int numTileY) { + this.numTileX = numTileX; + this.numTileY = numTileY; + this.tileX = 0; + this.tileY = 0; + } + + /** + * Set whether to dispose the grid coverage when the iterator reaches the end. Default is false. + * + * @param autoDisposeSource whether to dispose the grid coverage + */ + public void setAutoDisposeSource(boolean autoDisposeSource) { + this.autoDisposeSource = autoDisposeSource; + } + + public void setDisposeFunction(Runnable disposeFunction) { + this.disposeFunction = disposeFunction; + } + + public int getNumTileX() { + return numTileX; + } + + public int getNumTileY() { + return numTileY; + } + + public int getNumTiles() { + return numTileX * numTileY; + } + + protected abstract Tile generateTile(); + + @Override + public boolean hasNext() { + if (numTileX == 0 || numTileY == 0) { + return false; + } + return tileY < numTileY; + } + + @Override + public Tile next() { + // Check if current tile coordinate is valid + if (tileX >= numTileX || tileY >= numTileY) { + throw new NoSuchElementException(); + } + + Tile tile = generateTile(); + + // Advance to the next tile + tileX += 1; + if (tileX >= numTileX) { + tileX = 0; + tileY += 1; + + // Dispose the grid coverage if we are at the end + if (tileY >= numTileY) { + if (autoDisposeSource) { + gridCoverage2D.dispose(true); + } + if (disposeFunction != null) { + disposeFunction.run(); + } + } + } + + return tile; + } + } + + public static class InDbTileIterator extends TileIterator { + private final int[] bandIndices; + private final int tileWidth; + private final int tileHeight; + private final boolean padWithNoData; + private final double padNoDataValue; + private final AffineTransform2D affine; + private final RenderedImage image; + private final double[] noDataValues; + private final int imageWidth; + private final int imageHeight; + + public InDbTileIterator( + GridCoverage2D gridCoverage2D, + int[] bandIndices, + int tileWidth, + int tileHeight, + boolean padWithNoData, + double padNoDataValue) { + super(gridCoverage2D); + this.bandIndices = bandIndices; + this.tileWidth = tileWidth; + this.tileHeight = tileHeight; + this.padWithNoData = padWithNoData; + this.padNoDataValue = padNoDataValue; + + affine = RasterUtils.getAffineTransform(gridCoverage2D, PixelOrientation.CENTER); + image = gridCoverage2D.getRenderedImage(); + noDataValues = new double[bandIndices.length]; + for (int i = 0; i < bandIndices.length; i++) { + noDataValues[i] = + RasterUtils.getNoDataValue(gridCoverage2D.getSampleDimension(bandIndices[i] - 1)); + } + imageWidth = image.getWidth(); + imageHeight = image.getHeight(); + int numTileX = (int) Math.ceil((double) imageWidth / tileWidth); + int numTileY = (int) Math.ceil((double) imageHeight / tileHeight); + initialize(numTileX, numTileY); + } + + @Override + protected Tile generateTile() { + // Process the current tile + int x0 = tileX * tileWidth + image.getMinX(); + int y0 = tileY * tileHeight + image.getMinY(); + + // Rect to copy from the original image + int rectWidth = Math.min(tileWidth, imageWidth - x0); + int rectHeight = Math.min(tileHeight, imageHeight - y0); Review Comment: Fixed -- This is an automated message from the Apache Git Service. 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