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Java Source | 1997-10-27 | 5.7 KB | 184 lines |
- /*
- * @(#)ReplicateScaleFilter.java 1.2 96/11/23
- *
- * Copyright (c) 1995, 1996 Sun Microsystems, Inc. All Rights Reserved.
- *
- * This software is the confidential and proprietary information of Sun
- * Microsystems, Inc. ("Confidential Information"). You shall not
- * disclose such Confidential Information and shall use it only in
- * accordance with the terms of the license agreement you entered into
- * with Sun.
- *
- * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
- * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
- * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
- * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
- * THIS SOFTWARE OR ITS DERIVATIVES.
- *
- * CopyrightVersion 1.1_beta
- *
- */
-
- 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.
- * It is meant to be used in conjunction with a FilteredImageSource
- * object to produce scaled versions of existing images.
- *
- * @see FilteredImageSource
- * @see ImageFilter
- *
- * @version 1.2 11/23/96
- * @author Jim Graham
- */
- public class ReplicateScaleFilter extends ImageFilter {
- protected int srcWidth;
- protected int srcHeight;
- protected int destWidth;
- protected int destHeight;
-
- protected int srcrows[];
- protected int srccols[];
- 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
- */
- public ReplicateScaleFilter(int width, int height) {
- destWidth = width;
- destHeight = height;
- }
-
- /**
- * Passes along the properties from the source object after adding a
- * property indicating the scale applied.
- */
- public void setProperties(Hashtable props) {
- props = (Hashtable) props.clone();
- String key = "rescale";
- String val = destWidth + "x" + destHeight;
- Object o = props.get(key);
- if (o != null && o instanceof String) {
- val = ((String) o) + ", " + val;
- }
- props.put(key, val);
- super.setProperties(props);
- }
-
- /**
- * Override the dimensions of the source image and pass the dimensions
- * of the new scaled size to the ImageConsumer.
- * @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.
- */
- 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];
- }
- 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.
- */
- 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];
- }
- if (dx > dx1) {
- consumer.setPixels(dx1, dy, dx - dx1, 1,
- model, outpix, dx1, destWidth);
- }
- }
- }
- }
-