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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: if (consumer != null) 128: consumer.setDimensions(destWidth, destHeight); 129: } 130: 131: /** 132: * An <code>ImageProducer</code> can set a list of properties 133: * associated with this image by using this method. 134: * 135: * @param props the list of properties associated with this image 136: */ 137: public void setProperties(Hashtable props) 138: { 139: props.put("filters", "ReplicateScaleFilter"); 140: if (consumer != null) 141: consumer.setProperties(props); 142: } 143: 144: /** 145: * This function delivers a rectangle of pixels where any 146: * pixel(m,n) is stored in the array as a <code>byte</code> at 147: * index (n * scansize + m + offset). 148: * 149: * @param x the x coordinate of the rectangle 150: * @param y the y coordinate of the rectangle 151: * @param w the width of the rectangle 152: * @param h the height of the rectangle 153: * @param model the <code>ColorModel</code> used to translate the pixels 154: * @param pixels the array of pixel values 155: * @param offset the index of the first pixels in the <code>pixels</code> array 156: * @param scansize the width to use in extracting pixels from the <code>pixels</code> array 157: */ 158: public void setPixels(int x, int y, int w, int h, 159: ColorModel model, byte[] pixels, int offset, int scansize) 160: { 161: double rx = ((double) srcWidth) / destWidth; 162: double ry = ((double) srcHeight) / destHeight; 163: 164: int destScansize = (int) Math.round(scansize / rx); 165: 166: byte[] destPixels = replicatePixels(x, y, w, h, 167: model, pixels, offset, scansize, 168: rx, ry, destScansize); 169: 170: if (consumer != null) 171: consumer.setPixels((int) Math.floor(x/rx), (int) Math.floor(y/ry), 172: (int) Math.ceil(w/rx), (int) Math.ceil(h/ry), 173: model, destPixels, 0, destScansize); 174: } 175: 176: /** 177: * This function delivers a rectangle of pixels where any 178: * pixel(m,n) is stored in the array as an <code>int</code> at 179: * index (n * scansize + m + offset). 180: * 181: * @param x the x coordinate of the rectangle 182: * @param y the y coordinate of the rectangle 183: * @param w the width of the rectangle 184: * @param h the height of the rectangle 185: * @param model the <code>ColorModel</code> used to translate the pixels 186: * @param pixels the array of pixel values 187: * @param offset the index of the first pixels in the <code>pixels</code> array 188: * @param scansize the width to use in extracting pixels from the <code>pixels</code> array 189: */ 190: public void setPixels(int x, int y, int w, int h, 191: ColorModel model, int[] pixels, int offset, int scansize) 192: { 193: double rx = ((double) srcWidth) / destWidth; 194: double ry = ((double) srcHeight) / destHeight; 195: 196: int destScansize = (int) Math.round(scansize / rx); 197: 198: int[] destPixels = replicatePixels(x, y, w, h, 199: model, pixels, offset, scansize, 200: rx, ry, destScansize); 201: 202: if (consumer != null) 203: consumer.setPixels((int) Math.floor(x/rx), (int) Math.floor(y/ry), 204: (int) Math.ceil(w/rx), (int) Math.ceil(h/ry), 205: model, destPixels, 0, destScansize); 206: } 207: 208: private byte[] replicatePixels(int srcx, int srcy, int srcw, int srch, 209: ColorModel model, byte[] srcPixels, 210: int srcOffset, int srcScansize, 211: double rx, double ry, int destScansize) 212: { 213: byte[] destPixels = 214: new byte[(int) Math.ceil(srcw/rx) * (int) Math.ceil(srch/ry)]; 215: 216: int a, b; 217: for (int i = 0; i < destPixels.length; i++) 218: { 219: a = (int) ((int) ( ((double) i) / destScansize) * ry) * srcScansize; 220: b = (int) ((i % destScansize) * rx); 221: if ((a + b + srcOffset) < srcPixels.length) 222: destPixels[i] = srcPixels[a + b + srcOffset]; 223: } 224: 225: return destPixels; 226: } 227: 228: private int[] replicatePixels(int srcx, int srcy, int srcw, int srch, 229: ColorModel model, int[] srcPixels, 230: int srcOffset, int srcScansize, 231: double rx, double ry, int destScansize) 232: { 233: int[] destPixels = 234: new int[(int) Math.ceil(srcw/rx) * (int) Math.ceil(srch/ry)]; 235: 236: int a, b; 237: for (int i = 0; i < destPixels.length; i++) 238: { 239: a = (int) ((int) ( ((double) i) / destScansize) * ry) * srcScansize; 240: b = (int) ((i % destScansize) * rx); 241: if ((a + b + srcOffset) < srcPixels.length) 242: destPixels[i] = srcPixels[a + b + srcOffset]; 243: } 244: 245: return destPixels; 246: } 247: }
GNU Classpath (0.20) |