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/*
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* Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.awt.image;
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import java.awt.color.ICC_Profile;
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import java.awt.geom.Rectangle2D;
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import java.awt.Rectangle;
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import java.awt.RenderingHints;
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import java.awt.geom.Point2D;
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import sun.awt.image.ImagingLib;
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/**
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* This class implements a convolution from the source
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* to the destination.
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* Convolution using a convolution kernel is a spatial operation that
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* computes the output pixel from an input pixel by multiplying the kernel
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* with the surround of the input pixel.
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* This allows the output pixel to be affected by the immediate neighborhood
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* in a way that can be mathematically specified with a kernel.
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*<p>
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* This class operates with BufferedImage data in which color components are
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* premultiplied with the alpha component. If the Source BufferedImage has
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* an alpha component, and the color components are not premultiplied with
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* the alpha component, then the data are premultiplied before being
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* convolved. If the Destination has color components which are not
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* premultiplied, then alpha is divided out before storing into the
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* Destination (if alpha is 0, the color components are set to 0). If the
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* Destination has no alpha component, then the resulting alpha is discarded
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* after first dividing it out of the color components.
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* <p>
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* Rasters are treated as having no alpha channel. If the above treatment
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* of the alpha channel in BufferedImages is not desired, it may be avoided
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* by getting the Raster of a source BufferedImage and using the filter method
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* of this class which works with Rasters.
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* <p>
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* If a RenderingHints object is specified in the constructor, the
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* color rendering hint and the dithering hint may be used when color
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* conversion is required.
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*<p>
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* Note that the Source and the Destination may not be the same object.
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* @see Kernel
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* @see java.awt.RenderingHints#KEY_COLOR_RENDERING
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* @see java.awt.RenderingHints#KEY_DITHERING
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*/
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public class ConvolveOp implements BufferedImageOp, RasterOp {
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Kernel kernel;
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int edgeHint;
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RenderingHints hints;
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/**
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* Edge condition constants.
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*/
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/**
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* Pixels at the edge of the destination image are set to zero. This
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* is the default.
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*/
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public static final int EDGE_ZERO_FILL = 0;
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/**
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* Pixels at the edge of the source image are copied to
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* the corresponding pixels in the destination without modification.
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*/
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public static final int EDGE_NO_OP = 1;
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/**
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* Constructs a ConvolveOp given a Kernel, an edge condition, and a
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* RenderingHints object (which may be null).
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* @param kernel the specified <code>Kernel</code>
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* @param edgeCondition the specified edge condition
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* @param hints the specified <code>RenderingHints</code> object
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* @see Kernel
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* @see #EDGE_NO_OP
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* @see #EDGE_ZERO_FILL
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* @see java.awt.RenderingHints
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*/
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public ConvolveOp(Kernel kernel, int edgeCondition, RenderingHints hints) {
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this.kernel = kernel;
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this.edgeHint = edgeCondition;
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this.hints = hints;
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}
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/**
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* Constructs a ConvolveOp given a Kernel. The edge condition
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* will be EDGE_ZERO_FILL.
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* @param kernel the specified <code>Kernel</code>
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* @see Kernel
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* @see #EDGE_ZERO_FILL
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*/
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public ConvolveOp(Kernel kernel) {
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this.kernel = kernel;
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this.edgeHint = EDGE_ZERO_FILL;
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}
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/**
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* Returns the edge condition.
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* @return the edge condition of this <code>ConvolveOp</code>.
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* @see #EDGE_NO_OP
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* @see #EDGE_ZERO_FILL
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*/
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public int getEdgeCondition() {
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return edgeHint;
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}
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/**
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* Returns the Kernel.
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* @return the <code>Kernel</code> of this <code>ConvolveOp</code>.
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*/
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public final Kernel getKernel() {
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return (Kernel) kernel.clone();
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}
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/**
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* Performs a convolution on BufferedImages. Each component of the
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* source image will be convolved (including the alpha component, if
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* present).
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* If the color model in the source image is not the same as that
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* in the destination image, the pixels will be converted
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* in the destination. If the destination image is null,
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* a BufferedImage will be created with the source ColorModel.
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* The IllegalArgumentException may be thrown if the source is the
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* same as the destination.
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* @param src the source <code>BufferedImage</code> to filter
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* @param dst the destination <code>BufferedImage</code> for the
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* filtered <code>src</code>
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* @return the filtered <code>BufferedImage</code>
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* @throws NullPointerException if <code>src</code> is <code>null</code>
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* @throws IllegalArgumentException if <code>src</code> equals
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* <code>dst</code>
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* @throws ImagingOpException if <code>src</code> cannot be filtered
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*/
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public final BufferedImage filter (BufferedImage src, BufferedImage dst) {
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if (src == null) {
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throw new NullPointerException("src image is null");
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}
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if (src == dst) {
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throw new IllegalArgumentException("src image cannot be the "+
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"same as the dst image");
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}
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boolean needToConvert = false;
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ColorModel srcCM = src.getColorModel();
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ColorModel dstCM;
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BufferedImage origDst = dst;
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// Can't convolve an IndexColorModel. Need to expand it
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if (srcCM instanceof IndexColorModel) {
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IndexColorModel icm = (IndexColorModel) srcCM;
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src = icm.convertToIntDiscrete(src.getRaster(), false);
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srcCM = src.getColorModel();
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}
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if (dst == null) {
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dst = createCompatibleDestImage(src, null);
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dstCM = srcCM;
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origDst = dst;
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}
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else {
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dstCM = dst.getColorModel();
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if (srcCM.getColorSpace().getType() !=
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dstCM.getColorSpace().getType())
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{
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needToConvert = true;
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dst = createCompatibleDestImage(src, null);
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dstCM = dst.getColorModel();
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}
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else if (dstCM instanceof IndexColorModel) {
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dst = createCompatibleDestImage(src, null);
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dstCM = dst.getColorModel();
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}
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}
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if (ImagingLib.filter(this, src, dst) == null) {
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throw new ImagingOpException ("Unable to convolve src image");
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}
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if (needToConvert) {
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ColorConvertOp ccop = new ColorConvertOp(hints);
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ccop.filter(dst, origDst);
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}
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else if (origDst != dst) {
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java.awt.Graphics2D g = origDst.createGraphics();
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try {
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g.drawImage(dst, 0, 0, null);
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} finally {
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g.dispose();
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}
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}
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return origDst;
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}
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/**
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* Performs a convolution on Rasters. Each band of the source Raster
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* will be convolved.
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* The source and destination must have the same number of bands.
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* If the destination Raster is null, a new Raster will be created.
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* The IllegalArgumentException may be thrown if the source is
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* the same as the destination.
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* @param src the source <code>Raster</code> to filter
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* @param dst the destination <code>WritableRaster</code> for the
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* filtered <code>src</code>
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* @return the filtered <code>WritableRaster</code>
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* @throws NullPointerException if <code>src</code> is <code>null</code>
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* @throws ImagingOpException if <code>src</code> and <code>dst</code>
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* do not have the same number of bands
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* @throws ImagingOpException if <code>src</code> cannot be filtered
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* @throws IllegalArgumentException if <code>src</code> equals
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* <code>dst</code>
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*/
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public final WritableRaster filter (Raster src, WritableRaster dst) {
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if (dst == null) {
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dst = createCompatibleDestRaster(src);
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}
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else if (src == dst) {
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throw new IllegalArgumentException("src image cannot be the "+
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"same as the dst image");
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}
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else if (src.getNumBands() != dst.getNumBands()) {
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throw new ImagingOpException("Different number of bands in src "+
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" and dst Rasters");
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}
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if (ImagingLib.filter(this, src, dst) == null) {
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throw new ImagingOpException ("Unable to convolve src image");
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}
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return dst;
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}
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/**
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* Creates a zeroed destination image with the correct size and number
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* of bands. If destCM is null, an appropriate ColorModel will be used.
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* @param src Source image for the filter operation.
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* @param destCM ColorModel of the destination. Can be null.
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* @return a destination <code>BufferedImage</code> with the correct
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* size and number of bands.
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*/
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public BufferedImage createCompatibleDestImage(BufferedImage src,
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ColorModel destCM) {
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BufferedImage image;
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int w = src.getWidth();
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int h = src.getHeight();
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WritableRaster wr = null;
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if (destCM == null) {
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destCM = src.getColorModel();
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// Not much support for ICM
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if (destCM instanceof IndexColorModel) {
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destCM = ColorModel.getRGBdefault();
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} else {
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/* Create destination image as similar to the source
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* as it possible...
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*/
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wr = src.getData().createCompatibleWritableRaster(w, h);
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}
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}
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if (wr == null) {
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/* This is the case when destination color model
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* was explicitly specified (and it may be not compatible
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* with source raster structure) or source is indexed image.
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* We should use destination color model to create compatible
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* destination raster here.
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*/
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wr = destCM.createCompatibleWritableRaster(w, h);
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}
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image = new BufferedImage (destCM, wr,
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destCM.isAlphaPremultiplied(), null);
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return image;
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}
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/**
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* Creates a zeroed destination Raster with the correct size and number
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* of bands, given this source.
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*/
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public WritableRaster createCompatibleDestRaster(Raster src) {
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return src.createCompatibleWritableRaster();
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}
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/**
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* Returns the bounding box of the filtered destination image. Since
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* this is not a geometric operation, the bounding box does not
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* change.
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*/
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public final Rectangle2D getBounds2D(BufferedImage src) {
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return getBounds2D(src.getRaster());
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}
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/**
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* Returns the bounding box of the filtered destination Raster. Since
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* this is not a geometric operation, the bounding box does not
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* change.
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*/
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public final Rectangle2D getBounds2D(Raster src) {
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return src.getBounds();
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}
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/**
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* Returns the location of the destination point given a
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* point in the source. If dstPt is non-null, it will
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* be used to hold the return value. Since this is not a geometric
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* operation, the srcPt will equal the dstPt.
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*/
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public final Point2D getPoint2D(Point2D srcPt, Point2D dstPt) {
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if (dstPt == null) {
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dstPt = new Point2D.Float();
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}
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dstPt.setLocation(srcPt.getX(), srcPt.getY());
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return dstPt;
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}
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/**
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* Returns the rendering hints for this op.
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*/
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public final RenderingHints getRenderingHints() {
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return hints;
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}
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}
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