Initial revision
From-SVN: r102074
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Tom Tromey
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/* Copyright (C) 2004 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.image;
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import java.awt.RenderingHints;
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import java.awt.geom.Point2D;
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import java.awt.geom.Rectangle2D;
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import java.util.Arrays;
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/**
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* @author Jerry Quinn (jlquinn@optonline.net)
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*/
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public class RescaleOp implements BufferedImageOp, RasterOp
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{
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private float[] scale;
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private float[] offsets;
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private RenderingHints hints = null;
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public RescaleOp(float[] scaleFactors,
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float[] offsets,
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RenderingHints hints)
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{
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this.scale = scaleFactors;
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this.offsets = offsets;
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this.hints = hints;
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}
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public RescaleOp(float scaleFactor,
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float offset,
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RenderingHints hints)
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{
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scale = new float[]{ scaleFactor };
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offsets = new float[]{offset};
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this.hints = hints;
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}
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public final float[] getScaleFactors(float[] scaleFactors)
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{
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if (scaleFactors == null)
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scaleFactors = new float[scale.length];
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System.arraycopy(scale, 0, scaleFactors, 0, scale.length);
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return scaleFactors;
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}
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public final float[] getOffsets(float[] offsets)
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{
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if (offsets == null)
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offsets = new float[this.offsets.length];
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System.arraycopy(this.offsets, 0, offsets, 0, this.offsets.length);
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return offsets;
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}
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public final int getNumFactors()
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{
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return scale.length;
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}
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/* (non-Javadoc)
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* @see java.awt.image.BufferedImageOp#getRenderingHints()
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*/
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public RenderingHints getRenderingHints()
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{
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return hints;
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}
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/* (non-Javadoc)
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* @see java.awt.image.BufferedImageOp#filter(java.awt.image.BufferedImage, java.awt.image.BufferedImage)
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*/
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public final BufferedImage filter(BufferedImage src, BufferedImage dst)
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{
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// TODO Make sure premultiplied alpha is handled correctly.
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// TODO See that color conversion is handled.
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// TODO figure out how to use rendering hints.
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if (scale.length != offsets.length)
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throw new IllegalArgumentException();
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ColorModel scm = src.getColorModel();
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if (dst == null) dst = createCompatibleDestImage(src, null);
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WritableRaster wsrc = src.getRaster();
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WritableRaster wdst = dst.getRaster();
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// Share constant across colors except alpha
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if (scale.length == 1 || scale.length == scm.getNumColorComponents())
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{
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// Construct a raster that doesn't include an alpha band.
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int[] subbands = new int[scm.getNumColorComponents()];
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for (int i=0; i < subbands.length; i++) subbands[i] = i;
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wsrc =
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wsrc.createWritableChild(wsrc.minX, wsrc.minY, wsrc.width, wsrc.height,
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wsrc.minX, wsrc.minY, subbands);
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}
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// else all color bands
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filter(wsrc, wdst);
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return dst;
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}
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/* (non-Javadoc)
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* @see java.awt.image.RasterOp#filter(java.awt.image.Raster, java.awt.image.WritableRaster)
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*/
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public final WritableRaster filter(Raster src, WritableRaster dest)
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{
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if (dest == null) dest = src.createCompatibleWritableRaster();
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// Required sanity checks
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if (src.numBands != dest.numBands || scale.length != offsets.length)
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throw new IllegalArgumentException();
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if (scale.length != 1 && scale.length != src.numBands)
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throw new IllegalArgumentException();
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// Create scaling arrays if needed
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float[] lscale = scale;
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float[] loff = offsets;
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if (scale.length == 1)
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{
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lscale = new float[src.numBands];
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Arrays.fill(lscale, scale[0]);
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loff = new float[src.numBands];
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Arrays.fill(loff, offsets[0]);
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}
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// TODO The efficiency here can be improved for various data storage
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// patterns, aka SampleModels.
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float[] pixel = new float[src.numBands];
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for (int y = src.minY; y < src.height + src.minY; y++)
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for (int x = src.minX; x < src.width + src.minX; x++)
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{
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src.getPixel(x, y, pixel);
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for (int b = 0; b < src.numBands; b++)
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pixel[b] = pixel[b] * lscale[b] + loff[b];
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dest.setPixel(x, y, pixel);
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}
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return dest;
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}
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/* (non-Javadoc)
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* @see java.awt.image.BufferedImageOp#createCompatibleDestImage(java.awt.image.BufferedImage, java.awt.image.ColorModel)
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*/
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public BufferedImage createCompatibleDestImage(BufferedImage src,
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ColorModel dstCM)
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{
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if (dstCM == null) dstCM = src.getColorModel();
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WritableRaster wr = src.getRaster().createCompatibleWritableRaster();
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BufferedImage image
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= new BufferedImage(dstCM, wr, src.isPremultiplied, null);
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return image;
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}
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/* (non-Javadoc)
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* @see java.awt.image.RasterOp#createCompatibleDestRaster(java.awt.image.Raster)
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*/
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public WritableRaster createCompatibleDestRaster(Raster src)
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{
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return src.createCompatibleWritableRaster();
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}
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/* (non-Javadoc)
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* @see java.awt.image.BufferedImageOp#getBounds2D(java.awt.image.BufferedImage)
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*/
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public final Rectangle2D getBounds2D(BufferedImage src)
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{
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return src.getRaster().getBounds();
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}
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/* (non-Javadoc)
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* @see java.awt.image.RasterOp#getBounds2D(java.awt.image.Raster)
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*/
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public final Rectangle2D getBounds2D(Raster src)
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{
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return src.getBounds();
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}
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/* (non-Javadoc)
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* @see java.awt.image.BufferedImageOp#getPoint2D(java.awt.geom.Point2D, java.awt.geom.Point2D)
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*/
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public final Point2D getPoint2D(Point2D src, Point2D dst) {
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if (dst == null) dst = (Point2D) src.clone();
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else dst.setLocation(src);
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return dst;
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}
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}
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