| /* CropImageFilter.java -- Java class for cropping image filter |
| Copyright (C) 1999, 2004 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., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 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.awt.Rectangle; |
| import java.util.Hashtable; |
| |
| /** |
| * Currently this filter does almost nothing and needs to be implemented. |
| * |
| * @author C. Brian Jones (cbj@gnu.org) |
| */ |
| public class CropImageFilter extends ImageFilter |
| { |
| int x; |
| int y; |
| int width; |
| int height; |
| |
| /** |
| * Construct a new <code>CropImageFilter</code> instance. |
| * |
| * @param x the x-coordinate location of the top-left of the cropped rectangle |
| * @param y the y-coordinate location of the top-left of the cropped rectangle |
| * @param width the width of the cropped rectangle |
| * @param height the height of the cropped rectangle |
| */ |
| public CropImageFilter(int x, int y, int width, int height) { |
| this.x = x; |
| this.y = y; |
| this.width = width; |
| this.height = height; |
| } |
| |
| /** |
| * An <code>ImageProducer</code> indicates the size of the image |
| * being produced using this method. This filter overrides this |
| * method in order to set the dimentions to the size of the |
| * cropped rectangle instead of the size of the image. |
| * |
| * @param width the width of the image |
| * @param height the height of the image |
| */ |
| public void setDimensions(int width, int height) |
| { |
| consumer.setDimensions(this.width, this.height); |
| } |
| |
| /** |
| * An <code>ImageProducer</code> can set a list of properties |
| * associated with this image by using this method. |
| * <br> |
| * FIXME - What property is set for this class? |
| * |
| * @param props the list of properties associated with this image |
| */ |
| public void setProperties(Hashtable props) |
| { |
| props.put("filters", "CropImageFilter"); |
| 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) |
| { |
| Rectangle filterBounds = new Rectangle(this.x, this.y, |
| this.width, this.height); |
| Rectangle pixelBounds = new Rectangle(x, y, w, h); |
| |
| if (filterBounds.intersects(pixelBounds)) |
| { |
| Rectangle bounds = filterBounds.intersection(pixelBounds); |
| |
| byte[] cropped = new byte[bounds.width * bounds.height]; |
| for (int i = 0; i < bounds.height; i++) |
| { |
| int start = (bounds.y - pixelBounds.y + i) * scansize + offset; |
| |
| for (int j = 0; j < bounds.width; j++) |
| cropped[i * bounds.width + j] = pixels[start + bounds.x + j]; |
| } |
| |
| consumer.setPixels(bounds.x, bounds.y, |
| bounds.width, bounds.height, |
| model, cropped, 0, bounds.width); |
| } |
| } |
| |
| /** |
| * 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) |
| { |
| Rectangle filterBounds = new Rectangle(this.x, this.y, |
| this.width, this.height); |
| Rectangle pixelBounds = new Rectangle(x, y, w, h); |
| |
| if (filterBounds.intersects(pixelBounds)) |
| { |
| Rectangle bounds = filterBounds.intersection(pixelBounds); |
| |
| int[] cropped = new int[bounds.width * bounds.height]; |
| for (int i = 0; i < bounds.height; i++) |
| { |
| int start = (bounds.y - pixelBounds.y + i) * scansize + offset; |
| |
| for (int j = 0; j < bounds.width; j++) |
| cropped[i * bounds.width + j] = pixels[start + bounds.x + j]; |
| } |
| |
| consumer.setPixels(bounds.x, bounds.y, |
| bounds.width, bounds.height, |
| model, cropped, 0, bounds.width); |
| } |
| } |
| |
| } |
| |