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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: consumer.setDimensions(this.width, this.height); 83: } 84: 85: /** 86: * An <code>ImageProducer</code> can set a list of properties 87: * associated with this image by using this method. 88: * <br> 89: * FIXME - What property is set for this class? 90: * 91: * @param props the list of properties associated with this image 92: */ 93: public void setProperties(Hashtable props) 94: { 95: props.put("filters", "CropImageFilter"); 96: consumer.setProperties(props); 97: } 98: 99: /** 100: * This function delivers a rectangle of pixels where any 101: * pixel(m,n) is stored in the array as a <code>byte</code> at 102: * index (n * scansize + m + offset). 103: * 104: * @param x the x coordinate of the rectangle 105: * @param y the y coordinate of the rectangle 106: * @param w the width of the rectangle 107: * @param h the height of the rectangle 108: * @param model the <code>ColorModel</code> used to translate the pixels 109: * @param pixels the array of pixel values 110: * @param offset the index of the first pixels in the <code>pixels</code> array 111: * @param scansize the width to use in extracting pixels from the <code>pixels</code> array 112: */ 113: public void setPixels(int x, int y, int w, int h, 114: ColorModel model, byte[] pixels, int offset, int scansize) 115: { 116: Rectangle filterBounds = new Rectangle(this.x, this.y, 117: this.width, this.height); 118: Rectangle pixelBounds = new Rectangle(x, y, w, h); 119: 120: if (filterBounds.intersects(pixelBounds)) 121: { 122: Rectangle bounds = filterBounds.intersection(pixelBounds); 123: 124: byte[] cropped = new byte[bounds.width * bounds.height]; 125: for (int i = 0; i < bounds.height; i++) 126: { 127: int start = (bounds.y - pixelBounds.y + i) * scansize + offset; 128: 129: for (int j = 0; j < bounds.width; j++) 130: cropped[i * bounds.width + j] = pixels[start + bounds.x + j]; 131: } 132: 133: consumer.setPixels(bounds.x, bounds.y, 134: bounds.width, bounds.height, 135: model, cropped, 0, bounds.width); 136: } 137: } 138: 139: /** 140: * This function delivers a rectangle of pixels where any 141: * pixel(m,n) is stored in the array as an <code>int</code> at 142: * index (n * scansize + m + offset). 143: * 144: * @param x the x coordinate of the rectangle 145: * @param y the y coordinate of the rectangle 146: * @param w the width of the rectangle 147: * @param h the height of the rectangle 148: * @param model the <code>ColorModel</code> used to translate the pixels 149: * @param pixels the array of pixel values 150: * @param offset the index of the first pixels in the <code>pixels</code> array 151: * @param scansize the width to use in extracting pixels from the <code>pixels</code> array 152: */ 153: public void setPixels(int x, int y, int w, int h, 154: ColorModel model, int[] pixels, int offset, int scansize) 155: { 156: Rectangle filterBounds = new Rectangle(this.x, this.y, 157: this.width, this.height); 158: Rectangle pixelBounds = new Rectangle(x, y, w, h); 159: 160: if (filterBounds.intersects(pixelBounds)) 161: { 162: Rectangle bounds = filterBounds.intersection(pixelBounds); 163: 164: int[] cropped = new int[bounds.width * bounds.height]; 165: for (int i = 0; i < bounds.height; i++) 166: { 167: int start = (bounds.y - pixelBounds.y + i) * scansize + offset; 168: 169: for (int j = 0; j < bounds.width; j++) 170: cropped[i * bounds.width + j] = pixels[start + bounds.x + j]; 171: } 172: 173: consumer.setPixels(bounds.x, bounds.y, 174: bounds.width, bounds.height, 175: model, cropped, 0, bounds.width); 176: } 177: } 178: 179: }
GNU Classpath (0.17) |