BufferedImageFilter


1   /*
2    * @(#)BufferedImageFilter.java 1.30 03/12/19
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package java.awt.image;
9   
10  import java.util.Hashtable  ;
11  import java.awt.image.ImageConsumer  ;
12  import java.awt.image.ImageFilter  ;
13  
14  /**
15   * The <code>BufferedImageFilter</code> class subclasses an 
16   * <code>ImageFilter</code> to provide a simple means of
17   * using a single-source/single-destination image operator
18   * ({@link BufferedImageOp}) to filter a <code>BufferedImage</code>
19   * in the Image Producer/Consumer/Observer
20   * paradigm. Examples of these image operators are: {@link ConvolveOp},
21   * {@link AffineTransformOp} and {@link LookupOp}.
22   *
23   * @see ImageFilter
24   * @see BufferedImage
25   * @see BufferedImageOp
26   * @version 10 Feb 1997
27   */
28  
29  public class BufferedImageFilter extends ImageFilter   implements Cloneable   {
30      BufferedImageOp   bufferedImageOp;
31      ColorModel   model;
32      int width;
33      int height;
34      byte[] bytePixels;
35      int[] intPixels;
36  
37      /**
38       * Constructs a <code>BufferedImageFilter</code> with the
39       * specified single-source/single-destination operator.
40       * @param op the specified <code>BufferedImageOp</code> to
41       *           use to filter a <code>BufferedImage</code>
42       * @throws NullPointerException if op is null
43       */
44      public BufferedImageFilter (BufferedImageOp   op) {
45          super();
46          if (op == null) {
47              throw new NullPointerException  ("Operation cannot be null");
48          }
49          bufferedImageOp = op;
50      }
51  
52      /**
53       * Returns the <code>BufferedImageOp</code>.
54       * @return the operator of this <code>BufferedImageFilter</code>.
55       */
56      public BufferedImageOp   getBufferedImageOp() {
57          return bufferedImageOp;
58      }
59  
60      /**
61       * Filters the information provided in the 
62       * {@link ImageConsumer#setDimensions(int, int) setDimensions } method
63       * of the {@link ImageConsumer} interface.
64       * <p>
65       * Note: This method is intended to be called by the 
66       * {@link ImageProducer} of the <code>Image</code> whose pixels are
67       * being filtered. Developers using this class to retrieve pixels from
68       * an image should avoid calling this method directly since that
69       * operation could result in problems with retrieving the requested
70       * pixels.
71       * <p>
72       * @param width the width to which to set the width of this
73       *        <code>BufferedImageFilter</code>
74       * @param height the height to which to set the height of this
75       *        <code>BufferedImageFilter</code>
76       * @see ImageConsumer#setDimensions
77       */
78      public void setDimensions(int width, int height) {
79          if (width <= 0 || height <= 0) {
80              imageComplete(STATICIMAGEDONE);
81              return;
82          }
83          this.width  = width;
84          this.height = height;
85      }
86  
87      /**
88       * Filters the information provided in the 
89       * {@link ImageConsumer#setColorModel(ColorModel) setColorModel} method
90       * of the <code>ImageConsumer</code> interface.
91       * <p>
92       * If <code>model</code> is <code>null</code>, this
93       * method clears the current <code>ColorModel</code> of this
94       * <code>BufferedImageFilter</code>.
95       * <p>
96       * Note: This method is intended to be called by the 
97       * <code>ImageProducer</code> of the <code>Image</code> 
98       * whose pixels are being filtered.  Developers using this 
99       * class to retrieve pixels from an image
100      * should avoid calling this method directly since that 
101      * operation could result in problems with retrieving the 
102      * requested pixels.
103      * @param model the {@link ColorModel} to which to set the 
104      *        <code>ColorModel</code> of this <code>BufferedImageFilter</code>
105      * @see ImageConsumer#setColorModel
106      */
107     public void setColorModel(ColorModel   model) {
108         this.model = model;
109     }
110 
111     private void convertToRGB() {
112     int size = width * height;
113     int newpixels[] = new int[size];
114     if (bytePixels != null) {
115         for (int i = 0; i < size; i++) {
116         newpixels[i] = this.model.getRGB(bytePixels[i] & 0xff);
117         }
118     } else if (intPixels != null) {
119         for (int i = 0; i < size; i++) {
120         newpixels[i] = this.model.getRGB(intPixels[i]);
121         }
122     }
123     bytePixels = null;
124     intPixels = newpixels;
125     this.model = ColorModel.getRGBdefault();
126     }
127 
128     /**
129      * Filters the information provided in the <code>setPixels</code>
130      * method of the <code>ImageConsumer</code> interface which takes
131      * an array of bytes.
132      * <p>
133      * Note: This method is intended to be called by the 
134      * <code>ImageProducer</code> of the <code>Image</code> whose pixels 
135      * are being filtered.  Developers using
136      * this class to retrieve pixels from an image should avoid calling
137      * this method directly since that operation could result in problems
138      * with retrieving the requested pixels.
139      * @throws IllegalArgumentException if width or height are less than 
140      * zero.
141      * @see ImageConsumer#setPixels(int, int, int, int, ColorModel, byte[],
142                                     int, int)
143      */
144     public void setPixels(int x, int y, int w, int h,
145               ColorModel   model, byte pixels[], int off,
146               int scansize) {
147         // Fix 4184230
148         if (w < 0 || h < 0) {
149             throw new IllegalArgumentException  ("Width ("+w+
150                                                 ") and height ("+h+
151                                                 ") must be > 0");
152         }            
153         // Nothing to do
154         if (w == 0 || h == 0) {
155             return;
156         }
157     if (y < 0) {
158         int diff = -y;
159         if (diff >= h) {
160         return;
161         }
162         off += scansize * diff;
163         y += diff;
164         h -= diff;
165     }
166     if (y + h > height) {
167         h = height - y;
168         if (h <= 0) {
169         return;
170         }
171     }
172     if (x < 0) {
173         int diff = -x;
174         if (diff >= w) {
175         return;
176         }
177         off += diff;
178         x += diff;
179         w -= diff;
180     }
181     if (x + w > width) {
182         w = width - x;
183         if (w <= 0) {
184         return;
185         }
186     }
187     int dstPtr = y*width + x;
188     if (intPixels == null) {
189         if (bytePixels == null) {
190         bytePixels = new byte[width*height];
191         this.model = model;
192         } else if (this.model != model) {
193         convertToRGB();
194         }
195         if (bytePixels != null) {
196         for (int sh = h; sh > 0; sh--) {
197             System.arraycopy(pixels, off, bytePixels, dstPtr, w);
198             off += scansize;
199             dstPtr += width;
200         }
201         }
202     }
203     if (intPixels != null) {
204         int dstRem = width - w;
205         int srcRem = scansize - w;
206         for (int sh = h; sh > 0; sh--) {
207         for (int sw = w; sw > 0; sw--) {
208             intPixels[dstPtr++] = model.getRGB(pixels[off++]&0xff);
209         }
210         off    += srcRem;
211         dstPtr += dstRem;
212         }
213     }
214     }
215     /**
216      * Filters the information provided in the <code>setPixels</code> 
217      * method of the <code>ImageConsumer</code> interface which takes
218      * an array of integers.
219      * <p>
220      * Note: This method is intended to be called by the 
221      * <code>ImageProducer</code> of the <code>Image</code> whose 
222      * pixels are being filtered.  Developers using this class to 
223      * retrieve pixels from an image should avoid calling this method 
224      * directly since that operation could result in problems
225      * with retrieving the requested pixels.
226      * @throws IllegalArgumentException if width or height are less than 
227      * zero.
228      * @see ImageConsumer#setPixels(int, int, int, int, ColorModel, int[],
229                                     int, int)
230      */
231     public void setPixels(int x, int y, int w, int h,
232               ColorModel   model, int pixels[], int off,
233               int scansize) {
234         // Fix 4184230
235         if (w < 0 || h < 0) {
236             throw new IllegalArgumentException  ("Width ("+w+
237                                                 ") and height ("+h+
238                                                 ") must be > 0");
239         }
240         // Nothing to do
241         if (w == 0 || h == 0) {
242             return;
243         }
244     if (y < 0) {
245         int diff = -y;
246         if (diff >= h) {
247         return;
248         }
249         off += scansize * diff;
250         y += diff;
251         h -= diff;
252     }
253     if (y + h > height) {
254         h = height - y;
255         if (h <= 0) {
256         return;
257         }
258     }
259     if (x < 0) {
260         int diff = -x;
261         if (diff >= w) {
262         return;
263         }
264         off += diff;
265         x += diff;
266         w -= diff;
267     }
268     if (x + w > width) {
269         w = width - x;
270         if (w <= 0) {
271         return;
272         }
273     }
274 
275     if (intPixels == null) {
276         if (bytePixels == null) {
277         intPixels = new int[width * height];
278         this.model = model;
279         } else {
280         convertToRGB();
281         }
282     }
283     int dstPtr = y*width + x;
284     if (this.model == model) {
285         for (int sh = h; sh > 0; sh--) {
286         System.arraycopy(pixels, off, intPixels, dstPtr, w);
287         off += scansize;
288         dstPtr += width;
289         }
290     } else {
291         if (this.model != ColorModel.getRGBdefault()) {
292         convertToRGB();
293         }
294         int dstRem = width - w;
295         int srcRem = scansize - w;
296         for (int sh = h; sh > 0; sh--) {
297         for (int sw = w; sw > 0; sw--) {
298             intPixels[dstPtr++] = model.getRGB(pixels[off++]);
299         }
300         off += srcRem;
301         dstPtr += dstRem;
302         }
303     }
304     }
305 
306     /**
307      * Filters the information provided in the <code>imageComplete</code>
308      * method of the <code>ImageConsumer</code> interface.
309      * <p>
310      * Note: This method is intended to be called by the 
311      * <code>ImageProducer</code> of the <code>Image</code> whose pixels 
312      * are being filtered.  Developers using
313      * this class to retrieve pixels from an image should avoid calling
314      * this method directly since that operation could result in problems
315      * with retrieving the requested pixels.
316      * @param status the status of image loading
317      * @throws ImagingOpException if there was a problem calling the filter
318      * method of the <code>BufferedImageOp</code> associated with this 
319      * instance.
320      * @see ImageConsumer#imageComplete
321      */
322     public void imageComplete(int status) {
323         WritableRaster   wr;
324         switch(status) {
325         case IMAGEERROR:
326         case IMAGEABORTED:
327             // reinitialize the params
328             model  = null;
329             width  = -1;
330             height = -1;
331             intPixels  = null;
332             bytePixels = null;
333             break;
334 
335         case SINGLEFRAMEDONE:
336         case STATICIMAGEDONE:
337             if (width <= 0 || height <= 0) break;
338             if (model instanceof DirectColorModel  ) {
339                 if (intPixels == null) break;
340                 wr = createDCMraster();
341             }
342             else if (model instanceof IndexColorModel  ) {
343                 int[] bandOffsets = {0};
344                 if (bytePixels == null) break;
345                 DataBufferByte   db = new DataBufferByte  (bytePixels,
346                                                        width*height);
347                 wr = Raster.createInterleavedRaster(db, width, height, width,
348                                                     1, bandOffsets, null);
349             }
350             else {
351                 convertToRGB();
352                 if (intPixels == null) break;
353                 wr = createDCMraster();
354             }
355             BufferedImage   bi = new BufferedImage  (model, wr,
356                                                  model.isAlphaPremultiplied(),
357                                                  null);
358             bi = bufferedImageOp.filter(bi, null);
359             WritableRaster   r = bi.getRaster();
360             ColorModel   cm = bi.getColorModel();
361             int w = r.getWidth();
362             int h = r.getHeight();
363             consumer.setDimensions(w, h);
364             consumer.setColorModel(cm);
365             if (cm instanceof DirectColorModel  ) {
366                 DataBufferInt   db = (DataBufferInt  ) r.getDataBuffer();
367                 consumer.setPixels(0, 0, w, h,
368                                    cm, db.getData(), 0, w);
369             }
370             else if (cm instanceof IndexColorModel  ) {
371                 DataBufferByte   db = (DataBufferByte  ) r.getDataBuffer();
372                 consumer.setPixels(0, 0, w, h,
373                                    cm, db.getData(), 0, w);
374             }
375             else {
376                 throw new InternalError  ("Unknown color model "+cm);
377             }
378             break;
379         }
380     consumer.imageComplete(status);
381     }
382 
383     private final WritableRaster   createDCMraster() {
384         WritableRaster   wr;
385         DirectColorModel   dcm = (DirectColorModel  ) model;
386         boolean hasAlpha = model.hasAlpha();
387         int[] bandMasks = new int[3+(hasAlpha ? 1 : 0)];
388         bandMasks[0] = dcm.getRedMask();
389         bandMasks[1] = dcm.getGreenMask();
390         bandMasks[2] = dcm.getBlueMask();
391         if (hasAlpha) {
392             bandMasks[3] = dcm.getAlphaMask();
393         }
394         DataBufferInt   db = new DataBufferInt  (intPixels, width*height);
395         wr = Raster.createPackedRaster(db, width, height, width,
396                                        bandMasks, null);
397         return wr;
398     }
399 
400 }
401
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