| /* |
| * Copyright (c) 1996, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.awt.image; |
| |
| import java.awt.image.ImageConsumer; |
| import java.awt.image.ColorModel; |
| import java.util.Hashtable; |
| import java.awt.Rectangle; |
| |
| /** |
| * An ImageFilter class for scaling images using the simplest algorithm. |
| * This class extends the basic ImageFilter Class to scale an existing |
| * image and provide a source for a new image containing the resampled |
| * image. The pixels in the source image are sampled to produce pixels |
| * for an image of the specified size by replicating rows and columns of |
| * pixels to scale up or omitting rows and columns of pixels to scale |
| * down. |
| * <p>It is meant to be used in conjunction with a FilteredImageSource |
| * object to produce scaled versions of existing images. Due to |
| * implementation dependencies, there may be differences in pixel values |
| * of an image filtered on different platforms. |
| * |
| * @see FilteredImageSource |
| * @see ImageFilter |
| * |
| * @author Jim Graham |
| */ |
| public class ReplicateScaleFilter extends ImageFilter { |
| |
| /** |
| * The width of the source image. |
| */ |
| protected int srcWidth; |
| |
| /** |
| * The height of the source image. |
| */ |
| protected int srcHeight; |
| |
| /** |
| * The target width to scale the image. |
| */ |
| protected int destWidth; |
| |
| /** |
| * The target height to scale the image. |
| */ |
| protected int destHeight; |
| |
| /** |
| * An {@code int} array containing information about a |
| * row of pixels. |
| */ |
| protected int srcrows[]; |
| |
| /** |
| * An {@code int} array containing information about a |
| * column of pixels. |
| */ |
| protected int srccols[]; |
| |
| /** |
| * A {@code byte} array initialized with a size of |
| * {@link #destWidth} and used to deliver a row of pixel |
| * data to the {@link ImageConsumer}. |
| */ |
| protected Object outpixbuf; |
| |
| /** |
| * Constructs a ReplicateScaleFilter that scales the pixels from |
| * its source Image as specified by the width and height parameters. |
| * @param width the target width to scale the image |
| * @param height the target height to scale the image |
| * @throws IllegalArgumentException if {@code width} equals |
| * zero or {@code height} equals zero |
| */ |
| public ReplicateScaleFilter(int width, int height) { |
| if (width == 0 || height == 0) { |
| throw new IllegalArgumentException("Width ("+width+ |
| ") and height ("+height+ |
| ") must be non-zero"); |
| } |
| destWidth = width; |
| destHeight = height; |
| } |
| |
| /** |
| * Passes along the properties from the source object after adding a |
| * property indicating the scale applied. |
| * This method invokes {@code super.setProperties}, |
| * which might result in additional properties being added. |
| * <p> |
| * Note: This method is intended to be called by the |
| * {@code ImageProducer} of the {@code Image} whose pixels |
| * are being filtered. Developers using |
| * this class to filter pixels from an image should avoid calling |
| * this method directly since that operation could interfere |
| * with the filtering operation. |
| */ |
| public void setProperties(Hashtable<?,?> props) { |
| @SuppressWarnings("unchecked") |
| Hashtable<Object,Object> p = (Hashtable<Object,Object>)props.clone(); |
| String key = "rescale"; |
| String val = destWidth + "x" + destHeight; |
| Object o = p.get(key); |
| if (o != null && o instanceof String) { |
| val = ((String) o) + ", " + val; |
| } |
| p.put(key, val); |
| super.setProperties(p); |
| } |
| |
| /** |
| * Override the dimensions of the source image and pass the dimensions |
| * of the new scaled size to the ImageConsumer. |
| * <p> |
| * Note: This method is intended to be called by the |
| * {@code ImageProducer} of the {@code Image} whose pixels |
| * are being filtered. Developers using |
| * this class to filter pixels from an image should avoid calling |
| * this method directly since that operation could interfere |
| * with the filtering operation. |
| * @see ImageConsumer |
| */ |
| public void setDimensions(int w, int h) { |
| srcWidth = w; |
| srcHeight = h; |
| if (destWidth < 0) { |
| if (destHeight < 0) { |
| destWidth = srcWidth; |
| destHeight = srcHeight; |
| } else { |
| destWidth = srcWidth * destHeight / srcHeight; |
| } |
| } else if (destHeight < 0) { |
| destHeight = srcHeight * destWidth / srcWidth; |
| } |
| consumer.setDimensions(destWidth, destHeight); |
| } |
| |
| private void calculateMaps() { |
| srcrows = new int[destHeight + 1]; |
| for (int y = 0; y <= destHeight; y++) { |
| srcrows[y] = (2 * y * srcHeight + srcHeight) / (2 * destHeight); |
| } |
| srccols = new int[destWidth + 1]; |
| for (int x = 0; x <= destWidth; x++) { |
| srccols[x] = (2 * x * srcWidth + srcWidth) / (2 * destWidth); |
| } |
| } |
| |
| /** |
| * Choose which rows and columns of the delivered byte pixels are |
| * needed for the destination scaled image and pass through just |
| * those rows and columns that are needed, replicated as necessary. |
| * <p> |
| * Note: This method is intended to be called by the |
| * {@code ImageProducer} of the {@code Image} whose pixels |
| * are being filtered. Developers using |
| * this class to filter pixels from an image should avoid calling |
| * this method directly since that operation could interfere |
| * with the filtering operation. |
| */ |
| public void setPixels(int x, int y, int w, int h, |
| ColorModel model, byte pixels[], int off, |
| int scansize) { |
| if (srcrows == null || srccols == null) { |
| calculateMaps(); |
| } |
| int sx, sy; |
| int dx1 = (2 * x * destWidth + srcWidth - 1) / (2 * srcWidth); |
| int dy1 = (2 * y * destHeight + srcHeight - 1) / (2 * srcHeight); |
| byte outpix[]; |
| if (outpixbuf != null && outpixbuf instanceof byte[]) { |
| outpix = (byte[]) outpixbuf; |
| } else { |
| outpix = new byte[destWidth]; |
| outpixbuf = outpix; |
| } |
| for (int dy = dy1; (sy = srcrows[dy]) < y + h; dy++) { |
| int srcoff = off + scansize * (sy - y); |
| int dx; |
| for (dx = dx1; (sx = srccols[dx]) < x + w; dx++) { |
| outpix[dx] = pixels[srcoff + sx - x]; |
| } |
| if (dx > dx1) { |
| consumer.setPixels(dx1, dy, dx - dx1, 1, |
| model, outpix, dx1, destWidth); |
| } |
| } |
| } |
| |
| /** |
| * Choose which rows and columns of the delivered int pixels are |
| * needed for the destination scaled image and pass through just |
| * those rows and columns that are needed, replicated as necessary. |
| * <p> |
| * Note: This method is intended to be called by the |
| * {@code ImageProducer} of the {@code Image} whose pixels |
| * are being filtered. Developers using |
| * this class to filter pixels from an image should avoid calling |
| * this method directly since that operation could interfere |
| * with the filtering operation. |
| */ |
| public void setPixels(int x, int y, int w, int h, |
| ColorModel model, int pixels[], int off, |
| int scansize) { |
| if (srcrows == null || srccols == null) { |
| calculateMaps(); |
| } |
| int sx, sy; |
| int dx1 = (2 * x * destWidth + srcWidth - 1) / (2 * srcWidth); |
| int dy1 = (2 * y * destHeight + srcHeight - 1) / (2 * srcHeight); |
| int outpix[]; |
| if (outpixbuf != null && outpixbuf instanceof int[]) { |
| outpix = (int[]) outpixbuf; |
| } else { |
| outpix = new int[destWidth]; |
| outpixbuf = outpix; |
| } |
| for (int dy = dy1; (sy = srcrows[dy]) < y + h; dy++) { |
| int srcoff = off + scansize * (sy - y); |
| int dx; |
| for (dx = dx1; (sx = srccols[dx]) < x + w; dx++) { |
| outpix[dx] = pixels[srcoff + sx - x]; |
| } |
| if (dx > dx1) { |
| consumer.setPixels(dx1, dy, dx - dx1, 1, |
| model, outpix, dx1, destWidth); |
| } |
| } |
| } |
| } |