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jlechner |
/* ReplicateScaleFilter.java -- Java class for filtering images
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Copyright (C) 1999 Free Software Foundation, Inc.
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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.util.Hashtable;
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/**
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* This filter should be used for fast scaling of images where the result
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* does not need to ensure straight lines are still straight, etc. The
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* exact method is not defined by Sun but some sort of fast Box filter should
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* probably be correct.
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* <br>
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* Currently this filter does nothing and needs to be implemented.
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*
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* @author C. Brian Jones (cbj@gnu.org)
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*/
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public class ReplicateScaleFilter extends ImageFilter
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{
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public ReplicateScaleFilter(int width, int height) {
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destHeight = height;
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destWidth = width;
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}
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/**
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* The height of the destination image.
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*/
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protected int destHeight;
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/**
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* The width of the destination image.
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*/
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protected int destWidth;
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/**
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* The height of the source image.
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*/
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protected int srcHeight;
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/**
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* The width of the source image.
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*/
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protected int srcWidth;
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/**
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*
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*/
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protected int srcrows[];
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/**
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*
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*/
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protected int srccols[];
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/**
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*
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*/
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protected Object outpixbuf;
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/**
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* An <code>ImageProducer</code> indicates the size of the image
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* being produced using this method. A filter can override this
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* method to intercept these calls from the producer in order to
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* change either the width or the height before in turn calling
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* the consumer's <code>setDimensions</code> method.
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*
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* @param width the width of the image
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* @param height the height of the image
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*/
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public void setDimensions(int width, int height)
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{
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srcWidth = width;
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srcHeight = height;
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/* If either destHeight or destWidth is < 0, the image should
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maintain its original aspect ratio. When both are < 0,
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just maintain the original width and height. */
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if (destWidth < 0 && destHeight < 0)
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{
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destWidth = width;
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destHeight = height;
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}
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else if (destWidth < 0)
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{
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destWidth = (int) (width * ((double) destHeight / srcHeight));
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}
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else if (destHeight < 0)
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{
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destHeight = (int) (height * ((double) destWidth / srcWidth));
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}
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if (consumer != null)
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consumer.setDimensions(destWidth, destHeight);
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}
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/**
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* An <code>ImageProducer</code> can set a list of properties
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* associated with this image by using this method.
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*
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* @param props the list of properties associated with this image
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*/
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public void setProperties(Hashtable props)
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{
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props.put("filters", "ReplicateScaleFilter");
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if (consumer != null)
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consumer.setProperties(props);
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}
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/**
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* This function delivers a rectangle of pixels where any
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* pixel(m,n) is stored in the array as a <code>byte</code> at
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* index (n * scansize + m + offset).
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*
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* @param x the x coordinate of the rectangle
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* @param y the y coordinate of the rectangle
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* @param w the width of the rectangle
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* @param h the height of the rectangle
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* @param model the <code>ColorModel</code> used to translate the pixels
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* @param pixels the array of pixel values
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* @param offset the index of the first pixels in the <code>pixels</code> array
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* @param scansize the width to use in extracting pixels from the <code>pixels</code> array
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*/
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public void setPixels(int x, int y, int w, int h,
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ColorModel model, byte[] pixels, int offset, int scansize)
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{
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double rx = ((double) srcWidth) / destWidth;
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double ry = ((double) srcHeight) / destHeight;
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int destScansize = (int) Math.round(scansize / rx);
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byte[] destPixels = replicatePixels(x, y, w, h,
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model, pixels, offset, scansize,
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rx, ry, destScansize);
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if (consumer != null)
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consumer.setPixels((int) Math.floor(x/rx), (int) Math.floor(y/ry),
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(int) Math.ceil(w/rx), (int) Math.ceil(h/ry),
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model, destPixels, 0, destScansize);
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}
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/**
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* This function delivers a rectangle of pixels where any
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* pixel(m,n) is stored in the array as an <code>int</code> at
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* index (n * scansize + m + offset).
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*
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* @param x the x coordinate of the rectangle
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* @param y the y coordinate of the rectangle
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* @param w the width of the rectangle
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* @param h the height of the rectangle
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* @param model the <code>ColorModel</code> used to translate the pixels
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* @param pixels the array of pixel values
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* @param offset the index of the first pixels in the <code>pixels</code> array
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* @param scansize the width to use in extracting pixels from the <code>pixels</code> array
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*/
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public void setPixels(int x, int y, int w, int h,
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ColorModel model, int[] pixels, int offset, int scansize)
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{
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double rx = ((double) srcWidth) / destWidth;
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double ry = ((double) srcHeight) / destHeight;
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int destScansize = (int) Math.round(scansize / rx);
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int[] destPixels = replicatePixels(x, y, w, h,
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model, pixels, offset, scansize,
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rx, ry, destScansize);
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if (consumer != null)
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consumer.setPixels((int) Math.floor(x/rx), (int) Math.floor(y/ry),
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(int) Math.ceil(w/rx), (int) Math.ceil(h/ry),
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model, destPixels, 0, destScansize);
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}
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private byte[] replicatePixels(int srcx, int srcy, int srcw, int srch,
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ColorModel model, byte[] srcPixels,
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int srcOffset, int srcScansize,
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double rx, double ry, int destScansize)
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{
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byte[] destPixels =
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new byte[(int) Math.ceil(srcw/rx) * (int) Math.ceil(srch/ry)];
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int a, b;
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for (int i = 0; i < destPixels.length; i++)
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{
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a = (int) ((int) ( ((double) i) / destScansize) * ry) * srcScansize;
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b = (int) ((i % destScansize) * rx);
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if ((a + b + srcOffset) < srcPixels.length)
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destPixels[i] = srcPixels[a + b + srcOffset];
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}
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return destPixels;
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}
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private int[] replicatePixels(int srcx, int srcy, int srcw, int srch,
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ColorModel model, int[] srcPixels,
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int srcOffset, int srcScansize,
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double rx, double ry, int destScansize)
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{
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int[] destPixels =
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new int[(int) Math.ceil(srcw/rx) * (int) Math.ceil(srch/ry)];
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int a, b;
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for (int i = 0; i < destPixels.length; i++)
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{
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a = (int) ((int) ( ((double) i) / destScansize) * ry) * srcScansize;
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b = (int) ((i % destScansize) * rx);
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if ((a + b + srcOffset) < srcPixels.length)
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destPixels[i] = srcPixels[a + b + srcOffset];
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}
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return destPixels;
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}
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}
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