Source Code Cross Referenced for ImageRepresentation.java in  » 6.0-JDK-Modules » j2me » sun » awt » image » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » sun.awt.image 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)ImageRepresentation.java	1.64 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation. 
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt). 
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA 
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package sun.awt.image;
029:
030:        import java.awt.Color;
031:        import java.awt.Graphics;
032:        import java.awt.AWTException;
033:        import java.awt.Rectangle;
034:        import java.awt.image.ColorModel;
035:        import java.awt.image.ImageConsumer;
036:        import java.awt.image.ImageObserver;
037:        import sun.awt.image.ImageWatched;
038:        import sun.awt.AWTFinalizeable;
039:        import sun.awt.AWTFinalizer;
040:        import java.util.Hashtable;
041:
042:        public abstract class ImageRepresentation extends ImageWatched
043:                implements  ImageConsumer, AWTFinalizeable {
044:            private int pData;
045:            private InputStreamImageSource src;
046:            Image image;
047:            private int tag;
048:            private int width;
049:            private int height;
050:            private int hints;
051:            private int availinfo;
052:            boolean offscreen;
053:            private Rectangle newbits;
054:
055:            /**
056:             * Create an ImageRepresentation for the given Image scaled
057:             * to the given width and height and dithered or converted to
058:             * a ColorModel appropriate for the given image tag.
059:             */
060:            public ImageRepresentation(Image im, int t) {
061:                image = im;
062:                tag = t;
063:                if (image.getSource() instanceof  InputStreamImageSource) {
064:                    src = (InputStreamImageSource) image.getSource();
065:                }
066:            }
067:
068:            /**
069:             * Initialize this ImageRepresentation object to act as the
070:             * destination drawable for this OffScreen Image.
071:             */
072:            protected abstract void offscreenInit(Color bg);
073:
074:            /* TODO: Only used for Frame.setIcon - should use ImageWatcher instead */
075:            public synchronized void reconstruct(int flags) {
076:                if (src != null) {
077:                    src.checkSecurity(null, false);
078:                }
079:                int missinginfo = flags & ~availinfo;
080:                if ((availinfo & ImageObserver.ERROR) == 0 && missinginfo != 0) {
081:                    numWaiters++;
082:                    try {
083:                        startProduction();
084:                        missinginfo = flags & ~availinfo;
085:                        while ((availinfo & ImageObserver.ERROR) == 0
086:                                && missinginfo != 0) {
087:                            try {
088:                                wait();
089:                            } catch (InterruptedException e) {
090:                                Thread.currentThread().interrupt();
091:                                return;
092:                            }
093:                            missinginfo = flags & ~availinfo;
094:                        }
095:                    } finally {
096:                        decrementWaiters();
097:                    }
098:                }
099:            }
100:
101:            public int getWidth() {
102:                return width;
103:            }
104:
105:            public int getHeight() {
106:                return height;
107:            }
108:
109:            public void setDimensions(int w, int h) {
110:                if (src != null) {
111:                    src.checkSecurity(null, false);
112:                }
113:                image.setDimensions(w, h);
114:                newInfo(image, (ImageObserver.WIDTH | ImageObserver.HEIGHT), 0,
115:                        0, w, h);
116:                width = w;
117:                height = h;
118:                if (width <= 0 || height <= 0) {
119:                    imageComplete(ImageConsumer.IMAGEERROR);
120:                    return;
121:                }
122:                availinfo |= ImageObserver.WIDTH | ImageObserver.HEIGHT;
123:            }
124:
125:            public void setProperties(Hashtable props) {
126:                if (src != null) {
127:                    src.checkSecurity(null, false);
128:                }
129:                image.setProperties(props);
130:                newInfo(image, ImageObserver.PROPERTIES, 0, 0, 0, 0);
131:            }
132:
133:            public void setColorModel(ColorModel model) {
134:                if (src != null) {
135:                    src.checkSecurity(null, false);
136:                }
137:            }
138:
139:            public void setHints(int h) {
140:                if (src != null) {
141:                    src.checkSecurity(null, false);
142:                }
143:                hints = h;
144:            }
145:
146:            protected abstract boolean setBytePixels(int x, int y, int w,
147:                    int h, ColorModel model, byte pix[], int off, int scansize);
148:
149:            public void setPixels(int x, int y, int w, int h, ColorModel model,
150:                    byte pix[], int off, int scansize) {
151:                if (src != null) {
152:                    src.checkSecurity(null, false);
153:                }
154:                boolean ok = false;
155:                int cx, cy, cw, ch;
156:                synchronized (this ) {
157:                    if (newbits == null) {
158:                        newbits = new Rectangle(0, 0, width, height);
159:                    }
160:                    if (setBytePixels(x, y, w, h, model, pix, off, scansize)) {
161:                        availinfo |= ImageObserver.SOMEBITS;
162:                        ok = true;
163:                    }
164:                    cx = newbits.x;
165:                    cy = newbits.y;
166:                    cw = newbits.width;
167:                    ch = newbits.height;
168:                }
169:                if (ok && !offscreen
170:                        && ((availinfo & ImageObserver.FRAMEBITS) == 0)) {
171:                    newInfo(image, ImageObserver.SOMEBITS, cx, cy, cw, ch);
172:                }
173:            }
174:
175:            protected abstract boolean setIntPixels(int x, int y, int w, int h,
176:                    ColorModel model, int pix[], int off, int scansize);
177:
178:            public void setPixels(int x, int y, int w, int h, ColorModel model,
179:                    int pix[], int off, int scansize) {
180:                if (src != null) {
181:                    src.checkSecurity(null, false);
182:                }
183:                boolean ok = false;
184:                int cx, cy, cw, ch;
185:                synchronized (this ) {
186:                    if (newbits == null) {
187:                        newbits = new Rectangle(0, 0, width, height);
188:                    }
189:                    if (setIntPixels(x, y, w, h, model, pix, off, scansize)) {
190:                        availinfo |= ImageObserver.SOMEBITS;
191:                        ok = true;
192:                    }
193:                    cx = newbits.x;
194:                    cy = newbits.y;
195:                    cw = newbits.width;
196:                    ch = newbits.height;
197:                }
198:                if (ok && !offscreen
199:                        && ((availinfo & ImageObserver.FRAMEBITS) == 0)) {
200:                    newInfo(image, ImageObserver.SOMEBITS, cx, cy, cw, ch);
201:                }
202:            }
203:
204:            private boolean consuming = false;
205:
206:            protected abstract boolean finish(boolean force);
207:
208:            public void imageComplete(int status) {
209:                if (src != null) {
210:                    src.checkSecurity(null, false);
211:                }
212:                boolean done;
213:                int info;
214:                switch (status) {
215:                default:
216:                case ImageConsumer.IMAGEABORTED:
217:                    done = true;
218:                    info = ImageObserver.ABORT;
219:                    break;
220:
221:                case ImageConsumer.IMAGEERROR:
222:                    image.addInfo(ImageObserver.ERROR);
223:                    done = true;
224:                    info = ImageObserver.ERROR;
225:                    dispose();
226:                    break;
227:
228:                case ImageConsumer.STATICIMAGEDONE:
229:                    done = true;
230:                    info = ImageObserver.ALLBITS;
231:                    if (finish(false)) {
232:                        image.getSource().requestTopDownLeftRightResend(this );
233:                        finish(true);
234:                    }
235:                    break;
236:
237:                case ImageConsumer.SINGLEFRAMEDONE:
238:                    done = false;
239:                    info = ImageObserver.FRAMEBITS;
240:                    break;
241:                }
242:                synchronized (this ) {
243:                    if (done) {
244:                        image.getSource().removeConsumer(this );
245:                        consuming = false;
246:                        newbits = null;
247:                    }
248:                    availinfo |= info;
249:                    notifyAll();
250:                }
251:                if (!offscreen) {
252:                    newInfo(image, info, 0, 0, width, height);
253:                }
254:                image.infoDone(status);
255:            }
256:
257:            /*synchronized*/void startProduction() {
258:                if (!ImageProductionMonitor.allowsProduction()) {
259:                    // we are low on memory so terminate
260:                    // image loading and flag an image error.
261:                    //
262:                    imageComplete(ImageConsumer.IMAGEERROR);
263:                    return;
264:                }
265:                if (!consuming) {
266:                    consuming = true;
267:                    image.getSource().startProduction(this );
268:                }
269:            }
270:
271:            private int numWaiters;
272:
273:            private synchronized void checkConsumption() {
274:                if (watchers == null && numWaiters == 0
275:                        && ((availinfo & ImageObserver.ALLBITS) == 0)) {
276:                    dispose();
277:                }
278:            }
279:
280:            public synchronized void removeWatcher(ImageObserver iw) {
281:                super .removeWatcher(iw);
282:                checkConsumption();
283:            }
284:
285:            private synchronized void decrementWaiters() {
286:                --numWaiters;
287:                checkConsumption();
288:            }
289:
290:            public boolean prepare(ImageObserver iw) {
291:                if (src != null) {
292:                    src.checkSecurity(null, false);
293:                }
294:                if ((availinfo & ImageObserver.ERROR) != 0) {
295:                    if (iw != null) {
296:                        iw.imageUpdate(image, ImageObserver.ERROR
297:                                | ImageObserver.ABORT, -1, -1, -1, -1);
298:                    }
299:                    return false;
300:                }
301:                boolean done = ((availinfo & ImageObserver.ALLBITS) != 0);
302:                if (!done) {
303:                    addWatcher(iw);
304:                    startProduction();
305:                    // Some producers deliver image data synchronously
306:                    done = ((availinfo & ImageObserver.ALLBITS) != 0);
307:                }
308:                return done;
309:            }
310:
311:            public int check(ImageObserver iw) {
312:                if (src != null) {
313:                    src.checkSecurity(null, false);
314:                }
315:                if ((availinfo & (ImageObserver.ERROR | ImageObserver.ALLBITS)) == 0) {
316:                    addWatcher(iw);
317:                }
318:                return availinfo;
319:            }
320:
321:            protected abstract void imageDraw(Graphics g, int x, int y, Color c);
322:
323:            protected abstract void imageStretch(Graphics g, int dx1, int dy1,
324:                    int dx2, int dy2, int sx1, int sy1, int sx2, int sy2,
325:                    Color c);
326:
327:            /*
328:             * Delegates to the abstract imageStretch() routine to be implemented by the
329:             * subclasses.  Opportunities also exist for the subclasses to cache the
330:             * scaled image representations to avoid recomputations.
331:             */
332:            protected void imageScale(Graphics g, int x, int y, int w, int h,
333:                    Color c, boolean done) {
334:                imageStretch(g, x, y, x + w, y + h, 0, 0, width, height, c);
335:            }
336:
337:            public boolean drawImage(Graphics g, int x, int y, Color c,
338:                    ImageObserver iw) {
339:                if (src != null) {
340:                    src.checkSecurity(null, false);
341:                }
342:                if ((availinfo & ImageObserver.ERROR) != 0) {
343:                    if (iw != null) {
344:                        iw.imageUpdate(image, ImageObserver.ERROR
345:                                | ImageObserver.ABORT, -1, -1, -1, -1);
346:                    }
347:                    return false;
348:                }
349:                boolean done = ((availinfo & ImageObserver.ALLBITS) != 0);
350:                if (!done) {
351:                    addWatcher(iw);
352:                    startProduction();
353:                    // Some producers deliver image data synchronously
354:                    done = ((availinfo & ImageObserver.ALLBITS) != 0);
355:                }
356:                imageDraw(g, x, y, c);
357:                return done;
358:            }
359:
360:            public boolean drawStretchImage(Graphics g, int dx1, int dy1,
361:                    int dx2, int dy2, int sx1, int sy1, int sx2, int sy2,
362:                    Color c, ImageObserver iw) {
363:                if (src != null) {
364:                    src.checkSecurity(null, false);
365:                }
366:                if ((availinfo & ImageObserver.ERROR) != 0) {
367:                    if (iw != null) {
368:                        iw.imageUpdate(image, ImageObserver.ERROR
369:                                | ImageObserver.ABORT, -1, -1, -1, -1);
370:                    }
371:                    return false;
372:                }
373:                boolean done = ((availinfo & ImageObserver.ALLBITS) != 0);
374:                if (!done) {
375:                    addWatcher(iw);
376:                    startProduction();
377:                    // Some producers deliver image data synchronously
378:                    done = ((availinfo & ImageObserver.ALLBITS) != 0);
379:                }
380:                imageStretch(g, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, c);
381:                return done;
382:            }
383:
384:            public boolean drawScaledImage(Graphics g, int x, int y, int w,
385:                    int h, Color c, ImageObserver iw) {
386:                if (src != null) {
387:                    src.checkSecurity(null, false);
388:                }
389:                if ((availinfo & ImageObserver.ERROR) != 0) {
390:                    if (iw != null) {
391:                        iw.imageUpdate(image, ImageObserver.ERROR
392:                                | ImageObserver.ABORT, -1, -1, -1, -1);
393:                    }
394:                    return false;
395:                }
396:                boolean done = ((availinfo & ImageObserver.ALLBITS) != 0);
397:                if (!done) {
398:                    addWatcher(iw);
399:                    startProduction();
400:                    // Some producers deliver image data synchronously
401:                    done = ((availinfo & ImageObserver.ALLBITS) != 0);
402:                }
403:                if ((~availinfo & (ImageObserver.WIDTH | ImageObserver.HEIGHT)) != 0) {
404:                    return false;
405:                }
406:                if (w < 0) {
407:                    if (h < 0) {
408:                        w = width;
409:                        h = height;
410:                    } else {
411:                        w = h * width / height;
412:                    }
413:                } else if (h < 0) {
414:                    h = w * height / width;
415:                }
416:                if (w == width && h == height) {
417:                    imageDraw(g, x, y, c);
418:                } else {
419:                    imageScale(g, x, y, w, h, c, done);
420:                }
421:                return done;
422:            }
423:
424:            //
425:            // Check with all our ImageObservers to see if anybody is still interested.
426:            // If not, remove ourselves as a consumer.  cf.
427:            // InputStreamImageSource.proactivelyUpdateObservers()
428:            //
429:            void checkForInterest() {
430:                newInfo(image, 0, -1, -1, -1, -1);
431:            }
432:
433:            protected abstract void disposeImage();
434:
435:            synchronized void abort() {
436:                image.getSource().removeConsumer(this );
437:                consuming = false;
438:                newbits = null;
439:                disposeImage();
440:                newInfo(image, ImageObserver.ABORT, -1, -1, -1, -1);
441:                availinfo &= ~(ImageObserver.SOMEBITS | ImageObserver.FRAMEBITS
442:                        | ImageObserver.ALLBITS | ImageObserver.ERROR);
443:            }
444:
445:            synchronized void dispose() {
446:                image.getSource().removeConsumer(this );
447:                consuming = false;
448:                newbits = null;
449:                disposeImage();
450:                availinfo &= ~(ImageObserver.SOMEBITS | ImageObserver.FRAMEBITS | ImageObserver.ALLBITS);
451:            }
452:
453:            AWTFinalizeable finalnext;
454:
455:            public void finalize() {
456:                AWTFinalizer.addFinalizeable(this );
457:            }
458:
459:            public void doFinalization() {
460:                disposeImage();
461:            }
462:
463:            public void setNextFinalizeable(AWTFinalizeable o) {
464:                finalnext = o;
465:            }
466:
467:            public AWTFinalizeable getNextFinalizeable() {
468:                return finalnext;
469:            }
470:        }
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