RandomIterFallbackNoCacheNoArray.java

/* JAI-Ext - OpenSource Java Advanced Image Extensions Library
*    http://www.geo-solutions.it/
*    Copyright 2014 GeoSolutions


* Licensed 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 it.geosolutions.jaiext.iterators;

import java.awt.Rectangle;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.SampleModel;

import javax.media.jai.PlanarImage;
import javax.media.jai.iterator.RandomIter;

/**
 * Modified version of JAI {@link RandomIterFallbackIntNoCache} that doesn't stores the tile positions in an array. The current tile is
 * not cached but it is calculated every time.
 */
public class RandomIterFallbackNoCacheNoArray implements RandomIter {

    private RenderedImage im;

    private final Rectangle boundsRect;

    private final SampleModel sampleModel;

    private final int boundsX;

    private final int boundsY;
    
    private final int tileWidth;
    
    private final int tileHeight;
    
    private final int tileGridXOffset;
    
    private final int tileGridYOffset;

    public RandomIterFallbackNoCacheNoArray(RenderedImage im, Rectangle bounds) {
        this.im = im;

        Rectangle imBounds = new Rectangle(im.getMinX(), im.getMinY(), im.getWidth(),
                im.getHeight());
        this.boundsRect = imBounds.intersection(bounds);
        this.sampleModel = im.getSampleModel();

        this.boundsX = boundsRect.x;
        this.boundsY = boundsRect.y;
        
        this.tileWidth = im.getTileWidth();
        this.tileHeight = im.getTileHeight();
        this.tileGridXOffset = im.getTileGridXOffset();
        this.tileGridYOffset = im.getTileGridYOffset();
        
    }

    /**
     * Sets dataBuffer to the correct buffer for the pixel (x, y) = (xLocal + boundsRect.x, yLocal + boundsRect.y).
     * 
     * @param xLocal the X coordinate in the local coordinate system.
     * @param yLocal the Y coordinate in the local coordinate system.
     */
    private Raster makeCurrent(int xLocal, int yLocal) {

        final int tileX = PlanarImage.XToTileX(xLocal, tileGridXOffset, tileWidth);
        final int tileY = PlanarImage.YToTileY(yLocal, tileGridYOffset, tileHeight);

        return im.getTile(tileX, tileY);
    }

    public int getSample(int x, int y, int b) {
        // get tile
        Raster tile = makeCurrent(x - boundsX, y - boundsY);

        // get value
        final int sampleModelTranslateX = tile.getSampleModelTranslateX();
        final int sampleModelTranslateY = tile.getSampleModelTranslateY();

        return sampleModel.getSample(x - sampleModelTranslateX, y - sampleModelTranslateY, b,
                tile.getDataBuffer());
    }

    public float getSampleFloat(int x, int y, int b) {
        // get tile
        Raster tile = makeCurrent(x - boundsX, y - boundsY);

        // get value
        final int sampleModelTranslateX = tile.getSampleModelTranslateX();
        final int sampleModelTranslateY = tile.getSampleModelTranslateY();

        return sampleModel.getSampleFloat(x - sampleModelTranslateX, y - sampleModelTranslateY, b,
                tile.getDataBuffer());
    }

    public double getSampleDouble(int x, int y, int b) {
        // get tile
        Raster tile = makeCurrent(x - boundsX, y - boundsY);

        // get value
        final int sampleModelTranslateX = tile.getSampleModelTranslateX();
        final int sampleModelTranslateY = tile.getSampleModelTranslateY();

        return sampleModel.getSampleDouble(x - sampleModelTranslateX, y - sampleModelTranslateY, b,
                tile.getDataBuffer());
    }

    public int[] getPixel(int x, int y, int[] iArray) {
        // get tile
        Raster tile = makeCurrent(x - boundsX, y - boundsY);

        // get value
        final int sampleModelTranslateX = tile.getSampleModelTranslateX();
        final int sampleModelTranslateY = tile.getSampleModelTranslateY();

        return sampleModel.getPixel(x - sampleModelTranslateX, y - sampleModelTranslateY, iArray,
                tile.getDataBuffer());
    }

    public float[] getPixel(int x, int y, float[] fArray) {
        // get tile
        Raster tile = makeCurrent(x - boundsX, y - boundsY);

        // get value
        final int sampleModelTranslateX = tile.getSampleModelTranslateX();
        final int sampleModelTranslateY = tile.getSampleModelTranslateY();

        return sampleModel.getPixel(x - sampleModelTranslateX, y - sampleModelTranslateY, fArray,
                tile.getDataBuffer());
    }

    public double[] getPixel(int x, int y, double[] dArray) {
        // get tile
        Raster tile = makeCurrent(x - boundsX, y - boundsY);

        // get value
        final int sampleModelTranslateX = tile.getSampleModelTranslateX();
        final int sampleModelTranslateY = tile.getSampleModelTranslateY();

        return sampleModel.getPixel(x - sampleModelTranslateX, y - sampleModelTranslateY, dArray,
                tile.getDataBuffer());
    }

    public void done() {
    }
}