219 lines
8.0 KiB
Java
219 lines
8.0 KiB
Java
/* BandCombineOp.java - perform a combination on the bands of a raster
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Copyright (C) 2004, 2006 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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* Filter Raster pixels by applying a matrix.
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*
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* BandCombineOp applies a matrix to each pixel to produce new pixel values.
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* The width of the matrix must be the same or one more than the number of
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* bands in the source Raster. If one more, the pixels in the source are
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* assumed to contain an implicit 1.0 at the end.
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*
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* The rows of the matrix are multiplied by the pixel to produce the values
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* for the destination. Therefore the destination Raster must contain the
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* same number of bands as the number of rows in the filter matrix.
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*
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* This Op assumes that samples are integers; floating point sample types will
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* be rounded to their nearest integer value during filtering.
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*
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* @author Jerry Quinn (jlquinn@optonline.net)
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*/
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public class BandCombineOp implements RasterOp
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{
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private RenderingHints hints;
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private float[][] matrix;
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/**
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* Construct a BandCombineOp.
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*
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* @param matrix The matrix to filter pixels with.
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* @param hints Rendering hints to apply. Ignored.
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* @throws ArrayIndexOutOfBoundsException if the matrix is invalid
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*/
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public BandCombineOp(float[][] matrix, RenderingHints hints)
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{
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this.matrix = new float[matrix.length][];
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int width = matrix[0].length;
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for (int i = 0; i < matrix.length; i++)
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{
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this.matrix[i] = new float[width + 1];
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for (int j = 0; j < width; j++)
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this.matrix[i][j] = matrix[i][j];
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// The reference implementation pads the array with a trailing zero...
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this.matrix[i][width] = 0;
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}
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this.hints = hints;
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}
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/**
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* Filter Raster pixels through a matrix. Applies the Op matrix to source
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* pixes to produce dest pixels. Each row of the matrix is multiplied by the
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* src pixel components to produce the dest pixel. If matrix is one more than
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* the number of bands in the src, the last element is implicitly multiplied
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* by 1, i.e. added to the sum for that dest component. If dest is null, a
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* suitable Raster is created. This implementation uses
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* createCompatibleDestRaster.
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*
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* @param src The source Raster.
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* @param dest The destination Raster, or null.
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* @throws IllegalArgumentException if the destination raster is incompatible
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* with the source raster.
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* @return The filtered Raster.
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* @see java.awt.image.RasterOp#filter(java.awt.image.Raster,
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* java.awt.image.WritableRaster)
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*/
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public WritableRaster filter(Raster src, WritableRaster dest) {
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if (dest == null)
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dest = createCompatibleDestRaster(src);
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else if (dest.getNumBands() != src.getNumBands()
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|| dest.getTransferType() != src.getTransferType())
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throw new IllegalArgumentException("Destination raster is incompatible with source raster");
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// Filter the pixels
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int[] spix = new int[matrix[0].length - 1];
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int[] spix2 = new int[matrix[0].length - 1];
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int[] dpix = new int[matrix.length];
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for (int y = src.getMinY(); y < src.getHeight() + src.getMinY(); y++)
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for (int x = src.getMinX(); x < src.getWidth() + src.getMinX(); x++)
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{
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// In case matrix rows have implicit translation
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spix[spix.length - 1] = 1;
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src.getPixel(x, y, spix);
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// Do not re-calculate if pixel is identical to the last one
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// (ie, blocks of the same colour)
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if (!Arrays.equals(spix, spix2))
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{
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System.arraycopy(spix, 0, spix2, 0, spix.length);
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for (int i = 0; i < matrix.length; i++)
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{
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dpix[i] = 0;
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for (int j = 0; j < matrix[0].length - 1; j++)
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dpix[i] += spix[j] * (int)matrix[i][j];
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}
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}
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dest.setPixel(x, y, dpix);
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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.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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/**
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* Creates a new WritableRaster that can be used as the destination for this
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* Op. The number of bands in the source raster must equal the number of rows
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* in the op matrix, which must also be equal to either the number of columns
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* or (columns - 1) in the matrix.
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*
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* @param src The source raster.
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* @return A compatible raster.
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* @see java.awt.image.RasterOp#createCompatibleDestRaster(java.awt.image.Raster)
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* @throws IllegalArgumentException if the raster is incompatible with the
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* matrix.
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*/
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public WritableRaster createCompatibleDestRaster(Raster src)
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{
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// Destination raster must have same number of bands as source
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if (src.getNumBands() != matrix.length)
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throw new IllegalArgumentException("Number of rows in matrix specifies an "
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+ "incompatible number of bands");
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// We use -1 and -2 because we previously padded the rows with a trailing 0
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if (src.getNumBands() != matrix[0].length - 1
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&& src.getNumBands() != matrix[0].length - 2)
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throw new IllegalArgumentException("Incompatible number of bands: "
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+ "the number of bands in the raster must equal the number of "
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+ "columns in the matrix, optionally minus one");
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return src.createCompatibleWritableRaster();
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}
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/**
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* Return corresponding destination point for source point. Because this is
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* not a geometric operation, it simply returns a copy of the source.
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*
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* @param src The source point.
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* @param dst The destination point.
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* @return dst The destination point.
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* @see java.awt.image.RasterOp#getPoint2D(java.awt.geom.Point2D,
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*java.awt.geom.Point2D)
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*/
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public final Point2D getPoint2D(Point2D src, Point2D dst)
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{
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if (dst == null)
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return (Point2D)src.clone();
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dst.setLocation(src);
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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#getRenderingHints()
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*/
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public final RenderingHints getRenderingHints()
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{
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return hints;
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}
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/**
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* Return the matrix used in this operation.
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*
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* @return The matrix used in this operation.
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*/
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public final float[][] getMatrix()
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{
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return matrix;
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}
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}
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