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jlechner |
/* CropImageFilter.java -- Java class for cropping image filter
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Copyright (C) 1999, 2004 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.awt.Rectangle;
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import java.util.Hashtable;
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/**
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* Currently this filter does almost 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 CropImageFilter extends ImageFilter
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{
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int x;
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int y;
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int width;
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int height;
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/**
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* Construct a new <code>CropImageFilter</code> instance.
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*
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* @param x the x-coordinate location of the top-left of the cropped rectangle
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* @param y the y-coordinate location of the top-left of the cropped rectangle
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* @param width the width of the cropped rectangle
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* @param height the height of the cropped rectangle
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*/
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public CropImageFilter(int x, int y, int width, int height) {
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this.x = x;
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this.y = y;
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this.width = width;
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this.height = height;
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}
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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. This filter overrides this
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* method in order to set the dimentions to the size of the
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* cropped rectangle instead of the size of the image.
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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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if (consumer != null)
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consumer.setDimensions(this.width, this.height);
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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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* <br>
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* FIXME - What property is set for this class?
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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", "CropImageFilter");
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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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Rectangle filterBounds = new Rectangle(this.x, this.y,
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this.width, this.height);
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Rectangle pixelBounds = new Rectangle(x, y, w, h);
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if (filterBounds.intersects(pixelBounds))
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{
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Rectangle bounds = filterBounds.intersection(pixelBounds);
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byte[] cropped = new byte[bounds.width * bounds.height];
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for (int i = 0; i < bounds.height; i++)
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{
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int start = (bounds.y - pixelBounds.y + i) * scansize + offset;
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for (int j = 0; j < bounds.width; j++)
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cropped[i * bounds.width + j] = pixels[start + bounds.x + j];
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}
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if (consumer != null)
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consumer.setPixels(0, 0,
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bounds.width, bounds.height,
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model, cropped, 0, bounds.width);
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}
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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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Rectangle filterBounds = new Rectangle(this.x, this.y,
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this.width, this.height);
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Rectangle pixelBounds = new Rectangle(x, y, w, h);
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if (filterBounds.intersects(pixelBounds))
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{
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Rectangle bounds = filterBounds.intersection(pixelBounds);
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int[] cropped = new int[bounds.width * bounds.height];
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for (int i = 0; i < bounds.height; i++)
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{
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int start = (bounds.y - pixelBounds.y + i) * scansize + offset;
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for (int j = 0; j < bounds.width; j++)
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cropped[i * bounds.width + j] = pixels[start + bounds.x + j];
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}
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if (consumer != null)
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consumer.setPixels(0, 0,
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bounds.width, bounds.height,
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model, cropped, 0, bounds.width);
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}
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}
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}
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