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1: /* ReplicateScaleFilter.java -- Java class for filtering images 2: Copyright (C) 1999 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.util.Hashtable; 42: 43: /** 44: * This filter should be used for fast scaling of images where the result 45: * does not need to ensure straight lines are still straight, etc. The 46: * exact method is not defined by Sun but some sort of fast Box filter should 47: * probably be correct. 48: * <br> 49: * Currently this filter does nothing and needs to be implemented. 50: * 51: * @author C. Brian Jones (cbj@gnu.org) 52: */ 53: public class ReplicateScaleFilter extends ImageFilter 54: { 55: public ReplicateScaleFilter(int width, int height) { 56: destHeight = height; 57: destWidth = width; 58: } 59: 60: /** 61: * The height of the destination image. 62: */ 63: protected int destHeight; 64: 65: /** 66: * The width of the destination image. 67: */ 68: protected int destWidth; 69: 70: /** 71: * The height of the source image. 72: */ 73: protected int srcHeight; 74: 75: /** 76: * The width of the source image. 77: */ 78: protected int srcWidth; 79: 80: /** 81: * 82: */ 83: protected int srcrows[]; 84: 85: /** 86: * 87: */ 88: protected int srccols[]; 89: 90: /** 91: * 92: */ 93: protected Object outpixbuf; 94: 95: /** 96: * An <code>ImageProducer</code> indicates the size of the image 97: * being produced using this method. A filter can override this 98: * method to intercept these calls from the producer in order to 99: * change either the width or the height before in turn calling 100: * the consumer's <code>setDimensions</code> method. 101: * 102: * @param width the width of the image 103: * @param height the height of the image 104: */ 105: public void setDimensions(int width, int height) 106: { 107: srcWidth = width; 108: srcHeight = height; 109: 110: /* If either destHeight or destWidth is < 0, the image should 111: maintain its original aspect ratio. When both are < 0, 112: just maintain the original width and height. */ 113: if (destWidth < 0 && destHeight < 0) 114: { 115: destWidth = width; 116: destHeight = height; 117: } 118: else if (destWidth < 0) 119: { 120: destWidth = (int) (width * ((double) destHeight / srcHeight)); 121: } 122: else if (destHeight < 0) 123: { 124: destHeight = (int) (height * ((double) destWidth / srcWidth)); 125: } 126: 127: consumer.setDimensions(destWidth, destHeight); 128: } 129: 130: /** 131: * An <code>ImageProducer</code> can set a list of properties 132: * associated with this image by using this method. 133: * 134: * @param props the list of properties associated with this image 135: */ 136: public void setProperties(Hashtable props) 137: { 138: props.put("filters", "ReplicateScaleFilter"); 139: consumer.setProperties(props); 140: } 141: 142: /** 143: * This function delivers a rectangle of pixels where any 144: * pixel(m,n) is stored in the array as a <code>byte</code> at 145: * index (n * scansize + m + offset). 146: * 147: * @param x the x coordinate of the rectangle 148: * @param y the y coordinate of the rectangle 149: * @param w the width of the rectangle 150: * @param h the height of the rectangle 151: * @param model the <code>ColorModel</code> used to translate the pixels 152: * @param pixels the array of pixel values 153: * @param offset the index of the first pixels in the <code>pixels</code> array 154: * @param scansize the width to use in extracting pixels from the <code>pixels</code> array 155: */ 156: public void setPixels(int x, int y, int w, int h, 157: ColorModel model, byte[] pixels, int offset, int scansize) 158: { 159: double rx = ((double) srcWidth) / destWidth; 160: double ry = ((double) srcHeight) / destHeight; 161: 162: int destScansize = (int) Math.round(scansize / rx); 163: 164: byte[] destPixels = replicatePixels(x, y, w, h, 165: model, pixels, offset, scansize, 166: rx, ry, destScansize); 167: 168: consumer.setPixels((int) Math.floor(x/rx), (int) Math.floor(y/ry), 169: (int) Math.ceil(w/rx), (int) Math.ceil(h/ry), 170: model, destPixels, 0, destScansize); 171: } 172: 173: /** 174: * This function delivers a rectangle of pixels where any 175: * pixel(m,n) is stored in the array as an <code>int</code> at 176: * index (n * scansize + m + offset). 177: * 178: * @param x the x coordinate of the rectangle 179: * @param y the y coordinate of the rectangle 180: * @param w the width of the rectangle 181: * @param h the height of the rectangle 182: * @param model the <code>ColorModel</code> used to translate the pixels 183: * @param pixels the array of pixel values 184: * @param offset the index of the first pixels in the <code>pixels</code> array 185: * @param scansize the width to use in extracting pixels from the <code>pixels</code> array 186: */ 187: public void setPixels(int x, int y, int w, int h, 188: ColorModel model, int[] pixels, int offset, int scansize) 189: { 190: double rx = ((double) srcWidth) / destWidth; 191: double ry = ((double) srcHeight) / destHeight; 192: 193: int destScansize = (int) Math.round(scansize / rx); 194: 195: int[] destPixels = replicatePixels(x, y, w, h, 196: model, pixels, offset, scansize, 197: rx, ry, destScansize); 198: 199: consumer.setPixels((int) Math.floor(x/rx), (int) Math.floor(y/ry), 200: (int) Math.ceil(w/rx), (int) Math.ceil(h/ry), 201: model, destPixels, 0, destScansize); 202: } 203: 204: private byte[] replicatePixels(int srcx, int srcy, int srcw, int srch, 205: ColorModel model, byte[] srcPixels, 206: int srcOffset, int srcScansize, 207: double rx, double ry, int destScansize) 208: { 209: byte[] destPixels = 210: new byte[(int) Math.ceil(srcw/rx) * (int) Math.ceil(srch/ry)]; 211: 212: int a, b; 213: for (int i = 0; i < destPixels.length; i++) 214: { 215: a = (int) ((int) ( ((double) i) / destScansize) * ry) * srcScansize; 216: b = (int) ((i % destScansize) * rx); 217: if ((a + b + srcOffset) < srcPixels.length) 218: destPixels[i] = srcPixels[a + b + srcOffset]; 219: } 220: 221: return destPixels; 222: } 223: 224: private int[] replicatePixels(int srcx, int srcy, int srcw, int srch, 225: ColorModel model, int[] srcPixels, 226: int srcOffset, int srcScansize, 227: double rx, double ry, int destScansize) 228: { 229: int[] destPixels = 230: new int[(int) Math.ceil(srcw/rx) * (int) Math.ceil(srch/ry)]; 231: 232: int a, b; 233: for (int i = 0; i < destPixels.length; i++) 234: { 235: a = (int) ((int) ( ((double) i) / destScansize) * ry) * srcScansize; 236: b = (int) ((i % destScansize) * rx); 237: if ((a + b + srcOffset) < srcPixels.length) 238: destPixels[i] = srcPixels[a + b + srcOffset]; 239: } 240: 241: return destPixels; 242: } 243: }
GNU Classpath (0.17) |