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1: /* CropImageFilter.java -- Java class for cropping image filter 2: Copyright (C) 1999, 2004 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package java.awt.image; 40: 41: import java.awt.Rectangle; 42: import java.util.Hashtable; 43: 44: /** 45: * Currently this filter does almost nothing and needs to be implemented. 46: * 47: * @author C. Brian Jones (cbj@gnu.org) 48: */ 49: public class CropImageFilter extends ImageFilter 50: { 51: int x; 52: int y; 53: int width; 54: int height; 55: 56: /** 57: * Construct a new <code>CropImageFilter</code> instance. 58: * 59: * @param x the x-coordinate location of the top-left of the cropped rectangle 60: * @param y the y-coordinate location of the top-left of the cropped rectangle 61: * @param width the width of the cropped rectangle 62: * @param height the height of the cropped rectangle 63: */ 64: public CropImageFilter(int x, int y, int width, int height) { 65: this.x = x; 66: this.y = y; 67: this.width = width; 68: this.height = height; 69: } 70: 71: /** 72: * An <code>ImageProducer</code> indicates the size of the image 73: * being produced using this method. This filter overrides this 74: * method in order to set the dimentions to the size of the 75: * cropped rectangle instead of the size of the image. 76: * 77: * @param width the width of the image 78: * @param height the height of the image 79: */ 80: public void setDimensions(int width, int height) 81: { 82: if (consumer != null) 83: consumer.setDimensions(this.width, this.height); 84: } 85: 86: /** 87: * An <code>ImageProducer</code> can set a list of properties 88: * associated with this image by using this method. 89: * <br> 90: * FIXME - What property is set for this class? 91: * 92: * @param props the list of properties associated with this image 93: */ 94: public void setProperties(Hashtable<?, ?> props) 95: { 96: Hashtable<Object, Object> prop2 = (Hashtable<Object, Object>) props; 97: prop2.put("filters", "CropImageFilter"); 98: if (consumer != null) 99: consumer.setProperties(prop2); 100: } 101: 102: /** 103: * This function delivers a rectangle of pixels where any 104: * pixel(m,n) is stored in the array as a <code>byte</code> at 105: * index (n * scansize + m + offset). 106: * 107: * @param x the x coordinate of the rectangle 108: * @param y the y coordinate of the rectangle 109: * @param w the width of the rectangle 110: * @param h the height of the rectangle 111: * @param model the <code>ColorModel</code> used to translate the pixels 112: * @param pixels the array of pixel values 113: * @param offset the index of the first pixels in the <code>pixels</code> array 114: * @param scansize the width to use in extracting pixels from the <code>pixels</code> array 115: */ 116: public void setPixels(int x, int y, int w, int h, 117: ColorModel model, byte[] pixels, int offset, int scansize) 118: { 119: Rectangle filterBounds = new Rectangle(this.x, this.y, 120: this.width, this.height); 121: Rectangle pixelBounds = new Rectangle(x, y, w, h); 122: 123: if (filterBounds.intersects(pixelBounds)) 124: { 125: Rectangle bounds = filterBounds.intersection(pixelBounds); 126: 127: byte[] cropped = new byte[bounds.width * bounds.height]; 128: for (int i = 0; i < bounds.height; i++) 129: { 130: int start = (bounds.y - pixelBounds.y + i) * scansize + offset; 131: 132: for (int j = 0; j < bounds.width; j++) 133: cropped[i * bounds.width + j] = pixels[start + bounds.x + j]; 134: } 135: 136: if (consumer != null) 137: consumer.setPixels(0, 0, 138: bounds.width, bounds.height, 139: model, cropped, 0, bounds.width); 140: } 141: } 142: 143: /** 144: * This function delivers a rectangle of pixels where any 145: * pixel(m,n) is stored in the array as an <code>int</code> at 146: * index (n * scansize + m + offset). 147: * 148: * @param x the x coordinate of the rectangle 149: * @param y the y coordinate of the rectangle 150: * @param w the width of the rectangle 151: * @param h the height of the rectangle 152: * @param model the <code>ColorModel</code> used to translate the pixels 153: * @param pixels the array of pixel values 154: * @param offset the index of the first pixels in the <code>pixels</code> array 155: * @param scansize the width to use in extracting pixels from the <code>pixels</code> array 156: */ 157: public void setPixels(int x, int y, int w, int h, 158: ColorModel model, int[] pixels, int offset, int scansize) 159: { 160: Rectangle filterBounds = new Rectangle(this.x, this.y, 161: this.width, this.height); 162: Rectangle pixelBounds = new Rectangle(x, y, w, h); 163: 164: if (filterBounds.intersects(pixelBounds)) 165: { 166: Rectangle bounds = filterBounds.intersection(pixelBounds); 167: 168: int[] cropped = new int[bounds.width * bounds.height]; 169: for (int i = 0; i < bounds.height; i++) 170: { 171: int start = (bounds.y - pixelBounds.y + i) * scansize + offset; 172: 173: for (int j = 0; j < bounds.width; j++) 174: cropped[i * bounds.width + j] = pixels[start + bounds.x + j]; 175: } 176: 177: if (consumer != null) 178: consumer.setPixels(0, 0, 179: bounds.width, bounds.height, 180: model, cropped, 0, bounds.width); 181: } 182: } 183: 184: }