| /* ReplicateScaleFilter.java -- Java class for filtering images |
| Copyright (C) 1999 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package java.awt.image; |
| |
| import java.util.Hashtable; |
| |
| /** |
| * This filter should be used for fast scaling of images where the result |
| * does not need to ensure straight lines are still straight, etc. The |
| * exact method is not defined by Sun but some sort of fast Box filter should |
| * probably be correct. |
| * <br> |
| * |
| * @author C. Brian Jones (cbj@gnu.org) |
| */ |
| public class ReplicateScaleFilter extends ImageFilter |
| { |
| public ReplicateScaleFilter(int width, int height) { |
| destHeight = height; |
| destWidth = width; |
| } |
| |
| /** |
| * The height of the destination image. |
| */ |
| protected int destHeight; |
| |
| /** |
| * The width of the destination image. |
| */ |
| protected int destWidth; |
| |
| /** |
| * The height of the source image. |
| */ |
| protected int srcHeight; |
| |
| /** |
| * The width of the source image. |
| */ |
| protected int srcWidth; |
| |
| /** |
| * |
| */ |
| protected int srcrows[]; |
| |
| /** |
| * |
| */ |
| protected int srccols[]; |
| |
| /** |
| * |
| */ |
| protected Object outpixbuf; |
| |
| /** |
| * An <code>ImageProducer</code> indicates the size of the image |
| * being produced using this method. A filter can override this |
| * method to intercept these calls from the producer in order to |
| * change either the width or the height before in turn calling |
| * the consumer's <code>setDimensions</code> method. |
| * |
| * @param width the width of the image |
| * @param height the height of the image |
| */ |
| public void setDimensions(int width, int height) |
| { |
| srcWidth = width; |
| srcHeight = height; |
| |
| /* If either destHeight or destWidth is < 0, the image should |
| maintain its original aspect ratio. When both are < 0, |
| just maintain the original width and height. */ |
| if (destWidth < 0 && destHeight < 0) |
| { |
| destWidth = width; |
| destHeight = height; |
| } |
| else if (destWidth < 0) |
| { |
| destWidth = (int) (width * ((double) destHeight / srcHeight)); |
| } |
| else if (destHeight < 0) |
| { |
| destHeight = (int) (height * ((double) destWidth / srcWidth)); |
| } |
| |
| if (consumer != null) |
| consumer.setDimensions(destWidth, destHeight); |
| } |
| |
| /** |
| * An <code>ImageProducer</code> can set a list of properties |
| * associated with this image by using this method. |
| * |
| * @param props the list of properties associated with this image |
| */ |
| public void setProperties(Hashtable props) |
| { |
| props.put("filters", "ReplicateScaleFilter"); |
| if (consumer != null) |
| consumer.setProperties(props); |
| } |
| |
| /** |
| * This function delivers a rectangle of pixels where any |
| * pixel(m,n) is stored in the array as a <code>byte</code> at |
| * index (n * scansize + m + offset). |
| * |
| * @param x the x coordinate of the rectangle |
| * @param y the y coordinate of the rectangle |
| * @param w the width of the rectangle |
| * @param h the height of the rectangle |
| * @param model the <code>ColorModel</code> used to translate the pixels |
| * @param pixels the array of pixel values |
| * @param offset the index of the first pixels in the <code>pixels</code> array |
| * @param scansize the width to use in extracting pixels from the <code>pixels</code> array |
| */ |
| public void setPixels(int x, int y, int w, int h, |
| ColorModel model, byte[] pixels, int offset, int scansize) |
| { |
| double rx = ((double) srcWidth) / destWidth; |
| double ry = ((double) srcHeight) / destHeight; |
| |
| int destScansize = (int) Math.round(scansize / rx); |
| |
| byte[] destPixels = replicatePixels(x, y, w, h, |
| model, pixels, offset, scansize, |
| rx, ry, destScansize); |
| |
| if (consumer != null) |
| consumer.setPixels((int) Math.floor(x/rx), (int) Math.floor(y/ry), |
| (int) Math.ceil(w/rx), (int) Math.ceil(h/ry), |
| model, destPixels, 0, destScansize); |
| } |
| |
| /** |
| * This function delivers a rectangle of pixels where any |
| * pixel(m,n) is stored in the array as an <code>int</code> at |
| * index (n * scansize + m + offset). |
| * |
| * @param x the x coordinate of the rectangle |
| * @param y the y coordinate of the rectangle |
| * @param w the width of the rectangle |
| * @param h the height of the rectangle |
| * @param model the <code>ColorModel</code> used to translate the pixels |
| * @param pixels the array of pixel values |
| * @param offset the index of the first pixels in the <code>pixels</code> array |
| * @param scansize the width to use in extracting pixels from the <code>pixels</code> array |
| */ |
| public void setPixels(int x, int y, int w, int h, |
| ColorModel model, int[] pixels, int offset, int scansize) |
| { |
| double rx = ((double) srcWidth) / destWidth; |
| double ry = ((double) srcHeight) / destHeight; |
| |
| int destScansize = (int) Math.round(scansize / rx); |
| |
| int[] destPixels = replicatePixels(x, y, w, h, |
| model, pixels, offset, scansize, |
| rx, ry, destScansize); |
| |
| if (consumer != null) |
| consumer.setPixels((int) Math.floor(x/rx), (int) Math.floor(y/ry), |
| (int) Math.ceil(w/rx), (int) Math.ceil(h/ry), |
| model, destPixels, 0, destScansize); |
| } |
| |
| private byte[] replicatePixels(int srcx, int srcy, int srcw, int srch, |
| ColorModel model, byte[] srcPixels, |
| int srcOffset, int srcScansize, |
| double rx, double ry, int destScansize) |
| { |
| byte[] destPixels = |
| new byte[(int) Math.ceil(srcw/rx) * (int) Math.ceil(srch/ry)]; |
| |
| int a, b; |
| for (int i = 0; i < destPixels.length; i++) |
| { |
| a = (int) ((int) ( ((double) i) / destScansize) * ry) * srcScansize; |
| b = (int) ((i % destScansize) * rx); |
| if ((a + b + srcOffset) < srcPixels.length) |
| destPixels[i] = srcPixels[a + b + srcOffset]; |
| } |
| |
| return destPixels; |
| } |
| |
| private int[] replicatePixels(int srcx, int srcy, int srcw, int srch, |
| ColorModel model, int[] srcPixels, |
| int srcOffset, int srcScansize, |
| double rx, double ry, int destScansize) |
| { |
| int[] destPixels = |
| new int[(int) Math.ceil(srcw/rx) * (int) Math.ceil(srch/ry)]; |
| |
| int a, b; |
| for (int i = 0; i < destPixels.length; i++) |
| { |
| a = (int) ((int) ( ((double) i) / destScansize) * ry) * srcScansize; |
| b = (int) ((i % destScansize) * rx); |
| if ((a + b + srcOffset) < srcPixels.length) |
| destPixels[i] = srcPixels[a + b + srcOffset]; |
| } |
| |
| return destPixels; |
| } |
| } |
| |