1 /*
2 * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.imageio.plugins.jpeg;
27
28 import javax.imageio.IIOException;
29 import javax.imageio.ImageReader;
30 import javax.imageio.ImageReadParam;
31 import javax.imageio.ImageTypeSpecifier;
32 import javax.imageio.metadata.IIOMetadata;
33 import javax.imageio.spi.ImageReaderSpi;
34 import javax.imageio.stream.ImageInputStream;
35 import javax.imageio.plugins.jpeg.JPEGImageReadParam;
36 import javax.imageio.plugins.jpeg.JPEGQTable;
37 import javax.imageio.plugins.jpeg.JPEGHuffmanTable;
38
39 import java.awt.Point;
40 import java.awt.Rectangle;
41 import java.awt.color.ColorSpace;
42 import java.awt.color.ICC_Profile;
43 import java.awt.color.ICC_ColorSpace;
44 import java.awt.color.CMMException;
45 import java.awt.image.BufferedImage;
46 import java.awt.image.Raster;
47 import java.awt.image.WritableRaster;
48 import java.awt.image.DataBuffer;
49 import java.awt.image.DataBufferByte;
50 import java.awt.image.ColorModel;
51 import java.awt.image.IndexColorModel;
52 import java.awt.image.ColorConvertOp;
53 import java.io.IOException;
54 import java.util.List;
55 import java.util.Iterator;
56 import java.util.ArrayList;
57 import java.util.NoSuchElementException;
58
59 import sun.java2d.Disposer;
60 import sun.java2d.DisposerRecord;
61
62 public class JPEGImageReader extends ImageReader {
63
64 private boolean debug = false;
65
66 /**
67 * The following variable contains a pointer to the IJG library
68 * structure for this reader. It is assigned in the constructor
69 * and then is passed in to every native call. It is set to 0
70 * by dispose to avoid disposing twice.
71 */
72 private long structPointer = 0;
73
74 /** The input stream we read from */
75 private ImageInputStream iis = null;
76
77 /**
78 * List of stream positions for images, reinitialized every time
79 * a new input source is set.
80 */
81 private List<Long> imagePositions = null;
82
83 /**
84 * The number of images in the stream, or 0.
85 */
86 private int numImages = 0;
87
88 static {
89 java.security.AccessController.doPrivileged(
90 new java.security.PrivilegedAction<Void>() {
91 public Void run() {
92 System.loadLibrary("javajpeg");
93 return null;
94 }
95 });
96 initReaderIDs(ImageInputStream.class,
97 JPEGQTable.class,
98 JPEGHuffmanTable.class);
99 }
100
101 // The following warnings are converted to strings when used
102 // as keys to get localized resources from JPEGImageReaderResources
103 // and its children.
104
105 /**
106 * Warning code to be passed to warningOccurred to indicate
107 * that the EOI marker is missing from the end of the stream.
108 * This usually signals that the stream is corrupted, but
109 * everything up to the last MCU should be usable.
110 */
111 protected static final int WARNING_NO_EOI = 0;
112
113 /**
114 * Warning code to be passed to warningOccurred to indicate
115 * that a JFIF segment was encountered inside a JFXX JPEG
116 * thumbnail and is being ignored.
117 */
118 protected static final int WARNING_NO_JFIF_IN_THUMB = 1;
119
120 /**
121 * Warning code to be passed to warningOccurred to indicate
122 * that embedded ICC profile is invalid and will be ignored.
123 */
124 protected static final int WARNING_IGNORE_INVALID_ICC = 2;
125
126 private static final int MAX_WARNING = WARNING_IGNORE_INVALID_ICC;
127
128 /**
129 * Image index of image for which header information
130 * is available.
131 */
132 private int currentImage = -1;
133
134 // The following is copied out from C after reading the header.
135 // Unlike metadata, which may never be retrieved, we need this
136 // if we are to read an image at all.
137
138 /** Set by setImageData native code callback */
139 private int width;
140 /** Set by setImageData native code callback */
141 private int height;
142 /**
143 * Set by setImageData native code callback. A modified
144 * IJG+NIFTY colorspace code.
145 */
146 private int colorSpaceCode;
147 /**
148 * Set by setImageData native code callback. A modified
149 * IJG+NIFTY colorspace code.
150 */
151 private int outColorSpaceCode;
152 /** Set by setImageData native code callback */
153 private int numComponents;
154 /** Set by setImageData native code callback */
155 private ColorSpace iccCS = null;
156
157
158 /** If we need to post-convert in Java, convert with this op */
159 private ColorConvertOp convert = null;
160
161 /** The image we are going to fill */
162 private BufferedImage image = null;
163
164 /** An intermediate Raster to hold decoded data */
165 private WritableRaster raster = null;
166
167 /** A view of our target Raster that we can setRect to */
168 private WritableRaster target = null;
169
170 /** The databuffer for the above Raster */
171 private DataBufferByte buffer = null;
172
173 /** The region in the destination where we will write pixels */
174 private Rectangle destROI = null;
175
176 /** The list of destination bands, if any */
177 private int [] destinationBands = null;
178
179 /** Stream metadata, cached, even when the stream is changed. */
180 private JPEGMetadata streamMetadata = null;
181
182 /** Image metadata, valid for the imageMetadataIndex only. */
183 private JPEGMetadata imageMetadata = null;
184 private int imageMetadataIndex = -1;
185
186 /**
187 * Set to true every time we seek in the stream; used to
188 * invalidate the native buffer contents in C.
189 */
190 private boolean haveSeeked = false;
191
192 /**
193 * Tables that have been read from a tables-only image at the
194 * beginning of a stream.
195 */
196 private JPEGQTable [] abbrevQTables = null;
197 private JPEGHuffmanTable[] abbrevDCHuffmanTables = null;
198 private JPEGHuffmanTable[] abbrevACHuffmanTables = null;
199
200 private int minProgressivePass = 0;
201 private int maxProgressivePass = Integer.MAX_VALUE;
202
203 /**
204 * Variables used by progress monitoring.
205 */
206 private static final int UNKNOWN = -1; // Number of passes
207 private static final int MIN_ESTIMATED_PASSES = 10; // IJG default
208 private int knownPassCount = UNKNOWN;
209 private int pass = 0;
210 private float percentToDate = 0.0F;
211 private float previousPassPercentage = 0.0F;
212 private int progInterval = 0;
213
214 /**
215 * Set to true once stream has been checked for stream metadata
216 */
217 private boolean tablesOnlyChecked = false;
218
219 /** The referent to be registered with the Disposer. */
220 private Object disposerReferent = new Object();
221
222 /** The DisposerRecord that handles the actual disposal of this reader. */
223 private DisposerRecord disposerRecord;
224
225 /** Sets up static C structures. */
226 private static native void initReaderIDs(Class<?> iisClass,
227 Class<?> qTableClass,
228 Class<?> huffClass);
229
230 public JPEGImageReader(ImageReaderSpi originator) {
231 super(originator);
232 structPointer = initJPEGImageReader();
233 disposerRecord = new JPEGReaderDisposerRecord(structPointer);
234 Disposer.addRecord(disposerReferent, disposerRecord);
235 }
236
237 /** Sets up per-reader C structure and returns a pointer to it. */
238 private native long initJPEGImageReader();
239
240 /**
241 * Called by the native code or other classes to signal a warning.
242 * The code is used to lookup a localized message to be used when
243 * sending warnings to listeners.
244 */
245 protected void warningOccurred(int code) {
246 cbLock.lock();
247 try {
248 if ((code < 0) || (code > MAX_WARNING)){
249 throw new InternalError("Invalid warning index");
250 }
251 processWarningOccurred
252 ("com.sun.imageio.plugins.jpeg.JPEGImageReaderResources",
253 Integer.toString(code));
254 } finally {
255 cbLock.unlock();
256 }
257 }
258
259 /**
260 * The library has it's own error facility that emits warning messages.
261 * This routine is called by the native code when it has already
262 * formatted a string for output.
263 * XXX For truly complete localization of all warning messages,
264 * the sun_jpeg_output_message routine in the native code should
265 * send only the codes and parameters to a method here in Java,
266 * which will then format and send the warnings, using localized
267 * strings. This method will have to deal with all the parameters
268 * and formats (%u with possibly large numbers, %02d, %02x, etc.)
269 * that actually occur in the JPEG library. For now, this prevents
270 * library warnings from being printed to stderr.
271 */
272 protected void warningWithMessage(String msg) {
273 cbLock.lock();
274 try {
275 processWarningOccurred(msg);
276 } finally {
277 cbLock.unlock();
278 }
279 }
280
281 public void setInput(Object input,
282 boolean seekForwardOnly,
283 boolean ignoreMetadata)
284 {
285 setThreadLock();
286 try {
287 cbLock.check();
288
289 super.setInput(input, seekForwardOnly, ignoreMetadata);
290 this.ignoreMetadata = ignoreMetadata;
291 resetInternalState();
292 iis = (ImageInputStream) input; // Always works
293 setSource(structPointer);
294 } finally {
295 clearThreadLock();
296 }
297 }
298
299 /**
300 * This method is called from native code in order to fill
301 * native input buffer.
302 *
303 * We block any attempt to change the reading state during this
304 * method, in order to prevent a corruption of the native decoder
305 * state.
306 *
307 * @return number of bytes read from the stream.
308 */
309 private int readInputData(byte[] buf, int off, int len) throws IOException {
310 cbLock.lock();
311 try {
312 return iis.read(buf, off, len);
313 } finally {
314 cbLock.unlock();
315 }
316 }
317
318 /**
319 * This method is called from the native code in order to
320 * skip requested number of bytes in the input stream.
321 *
322 * @param n
323 * @return
324 * @throws IOException
325 */
326 private long skipInputBytes(long n) throws IOException {
327 cbLock.lock();
328 try {
329 return iis.skipBytes(n);
330 } finally {
331 cbLock.unlock();
332 }
333 }
334
335 private native void setSource(long structPointer);
336
337 private void checkTablesOnly() throws IOException {
338 if (debug) {
339 System.out.println("Checking for tables-only image");
340 }
341 long savePos = iis.getStreamPosition();
342 if (debug) {
343 System.out.println("saved pos is " + savePos);
344 System.out.println("length is " + iis.length());
345 }
346 // Read the first header
347 boolean tablesOnly = readNativeHeader(true);
348 if (tablesOnly) {
349 if (debug) {
350 System.out.println("tables-only image found");
351 long pos = iis.getStreamPosition();
352 System.out.println("pos after return from native is " + pos);
353 }
354 // This reads the tables-only image twice, once from C
355 // and once from Java, but only if ignoreMetadata is false
356 if (ignoreMetadata == false) {
357 iis.seek(savePos);
358 haveSeeked = true;
359 streamMetadata = new JPEGMetadata(true, false,
360 iis, this);
361 long pos = iis.getStreamPosition();
362 if (debug) {
363 System.out.println
364 ("pos after constructing stream metadata is " + pos);
365 }
366 }
367 // Now we are at the first image if there are any, so add it
368 // to the list
369 if (hasNextImage()) {
370 imagePositions.add(iis.getStreamPosition());
371 }
372 } else { // Not tables only, so add original pos to the list
373 imagePositions.add(savePos);
374 // And set current image since we've read it now
375 currentImage = 0;
376 }
377 // If the image positions list is empty as in the case of a tables-only
378 // stream, then attempting to access the element at index
379 // imagePositions.size() - 1 will cause an IndexOutOfBoundsException.
380 if (seekForwardOnly && !imagePositions.isEmpty()) {
381 Long pos = imagePositions.get(imagePositions.size()-1);
382 iis.flushBefore(pos.longValue());
383 }
384 tablesOnlyChecked = true;
385 }
386
387 public int getNumImages(boolean allowSearch) throws IOException {
388 setThreadLock();
389 try { // locked thread
390 cbLock.check();
391
392 return getNumImagesOnThread(allowSearch);
393 } finally {
394 clearThreadLock();
395 }
396 }
397
398 private void skipPastImage(int imageIndex) {
399 cbLock.lock();
400 try {
401 gotoImage(imageIndex);
402 skipImage();
403 } catch (IOException | IndexOutOfBoundsException e) {
404 } finally {
405 cbLock.unlock();
406 }
407 }
408
409 @SuppressWarnings("fallthrough")
410 private int getNumImagesOnThread(boolean allowSearch)
411 throws IOException {
412 if (numImages != 0) {
413 return numImages;
414 }
415 if (iis == null) {
416 throw new IllegalStateException("Input not set");
417 }
418 if (allowSearch == true) {
419 if (seekForwardOnly) {
420 throw new IllegalStateException(
421 "seekForwardOnly and allowSearch can't both be true!");
422 }
423 // Otherwise we have to read the entire stream
424
425 if (!tablesOnlyChecked) {
426 checkTablesOnly();
427 }
428
429 iis.mark();
430
431 gotoImage(0);
432
433 JPEGBuffer buffer = new JPEGBuffer(iis);
434 buffer.loadBuf(0);
435
436 boolean done = false;
437 while (!done) {
438 done = buffer.scanForFF(this);
439 switch (buffer.buf[buffer.bufPtr] & 0xff) {
440 case JPEG.SOI:
441 numImages++;
442 // FALL THROUGH to decrement buffer vars
443 // This first set doesn't have a length
444 case 0: // not a marker, just a data 0xff
445 case JPEG.RST0:
446 case JPEG.RST1:
447 case JPEG.RST2:
448 case JPEG.RST3:
449 case JPEG.RST4:
450 case JPEG.RST5:
451 case JPEG.RST6:
452 case JPEG.RST7:
453 case JPEG.EOI:
454 buffer.bufAvail--;
455 buffer.bufPtr++;
456 break;
457 // All the others have a length
458 default:
459 buffer.bufAvail--;
460 buffer.bufPtr++;
461 buffer.loadBuf(2);
462 int length = ((buffer.buf[buffer.bufPtr++] & 0xff) << 8) |
463 (buffer.buf[buffer.bufPtr++] & 0xff);
464 buffer.bufAvail -= 2;
465 length -= 2; // length includes itself
466 buffer.skipData(length);
467 }
468 }
469
470
471 iis.reset();
472
473 return numImages;
474 }
475
476 return -1; // Search is necessary for JPEG
477 }
478
479 /**
480 * Sets the input stream to the start of the requested image.
481 * <pre>
482 * @exception IllegalStateException if the input source has not been
483 * set.
484 * @exception IndexOutOfBoundsException if the supplied index is
485 * out of bounds.
486 * </pre>
487 */
488 private void gotoImage(int imageIndex) throws IOException {
489 if (iis == null) {
490 throw new IllegalStateException("Input not set");
491 }
492 if (imageIndex < minIndex) {
493 throw new IndexOutOfBoundsException();
494 }
495 if (!tablesOnlyChecked) {
496 checkTablesOnly();
497 }
498 // If the image positions list is empty as in the case of a tables-only
499 // stream, then no image data can be read.
500 if (imagePositions.isEmpty()) {
501 throw new IIOException("No image data present to read");
502 }
503 if (imageIndex < imagePositions.size()) {
504 iis.seek(imagePositions.get(imageIndex).longValue());
505 } else {
506 // read to start of image, saving positions
507 // First seek to the last position we already have, and skip the
508 // entire image
509 Long pos = imagePositions.get(imagePositions.size()-1);
510 iis.seek(pos.longValue());
511 skipImage();
512 // Now add all intervening positions, skipping images
513 for (int index = imagePositions.size();
514 index <= imageIndex;
515 index++) {
516 // Is there an image?
517 if (!hasNextImage()) {
518 throw new IndexOutOfBoundsException();
519 }
520 pos = iis.getStreamPosition();
521 imagePositions.add(pos);
522 if (seekForwardOnly) {
523 iis.flushBefore(pos.longValue());
524 }
525 if (index < imageIndex) {
526 skipImage();
527 } // Otherwise we are where we want to be
528 }
529 }
530
531 if (seekForwardOnly) {
532 minIndex = imageIndex;
533 }
534
535 haveSeeked = true; // No way is native buffer still valid
536 }
537
538 /**
539 * Skip over a complete image in the stream, leaving the stream
540 * positioned such that the next byte to be read is the first
541 * byte of the next image. For JPEG, this means that we read
542 * until we encounter an EOI marker or until the end of the stream.
543 * We can find data same as EOI marker in some headers
544 * or comments, so we have to skip bytes related to these headers.
545 * If the stream ends before an EOI marker is encountered,
546 * an IndexOutOfBoundsException is thrown.
547 */
548 private void skipImage() throws IOException {
549 if (debug) {
550 System.out.println("skipImage called");
551 }
552 // verify if image starts with an SOI marker
553 int initialFF = iis.read();
554 if (initialFF == 0xff) {
555 int soiMarker = iis.read();
556 if (soiMarker != JPEG.SOI) {
557 throw new IOException("skipImage : Invalid image doesn't "
558 + "start with SOI marker");
559 }
560 } else {
561 throw new IOException("skipImage : Invalid image doesn't start "
562 + "with 0xff");
563 }
564 boolean foundFF = false;
565 String IOOBE = "skipImage : Reached EOF before we got EOI marker";
566 int markerLength = 2;
567 for (int byteval = iis.read();
568 byteval != -1;
569 byteval = iis.read()) {
570
571 if (foundFF == true) {
572 switch (byteval) {
573 case JPEG.EOI:
574 if (debug) {
575 System.out.println("skipImage : Found EOI at " +
576 (iis.getStreamPosition() - markerLength));
577 }
578 return;
579 case JPEG.SOI:
580 throw new IOException("skipImage : Found extra SOI"
581 + " marker before getting to EOI");
582 case 0:
583 case 255:
584 // markers which doesn't contain length data
585 case JPEG.RST0:
586 case JPEG.RST1:
587 case JPEG.RST2:
588 case JPEG.RST3:
589 case JPEG.RST4:
590 case JPEG.RST5:
591 case JPEG.RST6:
592 case JPEG.RST7:
593 case JPEG.TEM:
594 break;
595 // markers which contains length data
596 case JPEG.SOF0:
597 case JPEG.SOF1:
598 case JPEG.SOF2:
599 case JPEG.SOF3:
600 case JPEG.DHT:
601 case JPEG.SOF5:
602 case JPEG.SOF6:
603 case JPEG.SOF7:
604 case JPEG.JPG:
605 case JPEG.SOF9:
606 case JPEG.SOF10:
607 case JPEG.SOF11:
608 case JPEG.DAC:
609 case JPEG.SOF13:
610 case JPEG.SOF14:
611 case JPEG.SOF15:
612 case JPEG.SOS:
613 case JPEG.DQT:
614 case JPEG.DNL:
615 case JPEG.DRI:
616 case JPEG.DHP:
617 case JPEG.EXP:
618 case JPEG.APP0:
619 case JPEG.APP1:
620 case JPEG.APP2:
621 case JPEG.APP3:
622 case JPEG.APP4:
623 case JPEG.APP5:
624 case JPEG.APP6:
625 case JPEG.APP7:
626 case JPEG.APP8:
627 case JPEG.APP9:
628 case JPEG.APP10:
629 case JPEG.APP11:
630 case JPEG.APP12:
631 case JPEG.APP13:
632 case JPEG.APP14:
633 case JPEG.APP15:
634 case JPEG.COM:
635 // read length of header from next 2 bytes
636 int lengthHigherBits, lengthLowerBits, length;
637 lengthHigherBits = iis.read();
638 if (lengthHigherBits != (-1)) {
639 lengthLowerBits = iis.read();
640 if (lengthLowerBits != (-1)) {
641 length = (lengthHigherBits << 8) |
642 lengthLowerBits;
643 // length contains already read 2 bytes
644 length -= 2;
645 } else {
646 throw new IndexOutOfBoundsException(IOOBE);
647 }
648 } else {
649 throw new IndexOutOfBoundsException(IOOBE);
650 }
651 // skip the length specified in marker
652 iis.skipBytes(length);
653 break;
654 case (-1):
655 throw new IndexOutOfBoundsException(IOOBE);
656 default:
657 throw new IOException("skipImage : Invalid marker "
658 + "starting with ff "
659 + Integer.toHexString(byteval));
660 }
661 }
662 foundFF = (byteval == 0xff);
663 }
664 throw new IndexOutOfBoundsException(IOOBE);
665 }
666
667 /**
668 * Returns {@code true} if there is an image beyond
669 * the current stream position. Does not disturb the
670 * stream position.
671 */
672 private boolean hasNextImage() throws IOException {
673 if (debug) {
674 System.out.print("hasNextImage called; returning ");
675 }
676 iis.mark();
677 boolean foundFF = false;
678 for (int byteval = iis.read();
679 byteval != -1;
680 byteval = iis.read()) {
681
682 if (foundFF == true) {
683 if (byteval == JPEG.SOI) {
684 iis.reset();
685 if (debug) {
686 System.out.println("true");
687 }
688 return true;
689 }
690 }
691 foundFF = (byteval == 0xff) ? true : false;
692 }
693 // We hit the end of the stream before we hit an SOI, so no image
694 iis.reset();
695 if (debug) {
696 System.out.println("false");
697 }
698 return false;
699 }
700
701 /**
702 * Push back the given number of bytes to the input stream.
703 * Called by the native code at the end of each image so
704 * that the next one can be identified from Java.
705 */
706 private void pushBack(int num) throws IOException {
707 if (debug) {
708 System.out.println("pushing back " + num + " bytes");
709 }
710 cbLock.lock();
711 try {
712 iis.seek(iis.getStreamPosition()-num);
713 // The buffer is clear after this, so no need to set haveSeeked.
714 } finally {
715 cbLock.unlock();
716 }
717 }
718
719 /**
720 * Reads header information for the given image, if possible.
721 */
722 private void readHeader(int imageIndex, boolean reset)
723 throws IOException {
724 gotoImage(imageIndex);
725 readNativeHeader(reset); // Ignore return
726 currentImage = imageIndex;
727 }
728
729 private boolean readNativeHeader(boolean reset) throws IOException {
730 boolean retval = false;
731 retval = readImageHeader(structPointer, haveSeeked, reset);
732 haveSeeked = false;
733 return retval;
734 }
735
736 /**
737 * Read in the header information starting from the current
738 * stream position, returning {@code true} if the
739 * header was a tables-only image. After this call, the
740 * native IJG decompression struct will contain the image
741 * information required by most query calls below
742 * (e.g. getWidth, getHeight, etc.), if the header was not
743 * a tables-only image.
744 * If reset is {@code true}, the state of the IJG
745 * object is reset so that it can read a header again.
746 * This happens automatically if the header was a tables-only
747 * image.
748 */
749 private native boolean readImageHeader(long structPointer,
750 boolean clearBuffer,
751 boolean reset)
752 throws IOException;
753
754 /*
755 * Called by the native code whenever an image header has been
756 * read. Whether we read metadata or not, we always need this
757 * information, so it is passed back independently of
758 * metadata, which may never be read.
759 */
760 private void setImageData(int width,
761 int height,
762 int colorSpaceCode,
763 int outColorSpaceCode,
764 int numComponents,
765 byte [] iccData) {
766 this.width = width;
767 this.height = height;
768 this.colorSpaceCode = colorSpaceCode;
769 this.outColorSpaceCode = outColorSpaceCode;
770 this.numComponents = numComponents;
771
772 if (iccData == null) {
773 iccCS = null;
774 return;
775 }
776
777 ICC_Profile newProfile = null;
778 try {
779 newProfile = ICC_Profile.getInstance(iccData);
780 } catch (IllegalArgumentException e) {
781 /*
782 * Color profile data seems to be invalid.
783 * Ignore this profile.
784 */
785 iccCS = null;
786 warningOccurred(WARNING_IGNORE_INVALID_ICC);
787
788 return;
789 }
790 byte[] newData = newProfile.getData();
791
792 ICC_Profile oldProfile = null;
793 if (iccCS instanceof ICC_ColorSpace) {
794 oldProfile = ((ICC_ColorSpace)iccCS).getProfile();
795 }
796 byte[] oldData = null;
797 if (oldProfile != null) {
798 oldData = oldProfile.getData();
799 }
800
801 /*
802 * At the moment we can't rely on the ColorSpace.equals()
803 * and ICC_Profile.equals() because they do not detect
804 * the case when two profiles are created from same data.
805 *
806 * So, we have to do data comparison in order to avoid
807 * creation of different ColorSpace instances for the same
808 * embedded data.
809 */
810 if (oldData == null ||
811 !java.util.Arrays.equals(oldData, newData))
812 {
813 iccCS = new ICC_ColorSpace(newProfile);
814 // verify new color space
815 try {
816 float[] colors = iccCS.fromRGB(new float[] {1f, 0f, 0f});
817 } catch (CMMException e) {
818 /*
819 * Embedded profile seems to be corrupted.
820 * Ignore this profile.
821 */
822 iccCS = null;
823 cbLock.lock();
824 try {
825 warningOccurred(WARNING_IGNORE_INVALID_ICC);
826 } finally {
827 cbLock.unlock();
828 }
829 }
830 }
831 }
832
833 public int getWidth(int imageIndex) throws IOException {
834 setThreadLock();
835 try {
836 if (currentImage != imageIndex) {
837 cbLock.check();
838 readHeader(imageIndex, true);
839 }
840 return width;
841 } finally {
842 clearThreadLock();
843 }
844 }
845
846 public int getHeight(int imageIndex) throws IOException {
847 setThreadLock();
848 try {
849 if (currentImage != imageIndex) {
850 cbLock.check();
851 readHeader(imageIndex, true);
852 }
853 return height;
854 } finally {
855 clearThreadLock();
856 }
857 }
858
859 /////////// Color Conversion and Image Types
860
861 /**
862 * Return an ImageTypeSpecifier corresponding to the given
863 * color space code, or null if the color space is unsupported.
864 */
865 private ImageTypeProducer getImageType(int code) {
866 ImageTypeProducer ret = null;
867
868 if ((code > 0) && (code < JPEG.NUM_JCS_CODES)) {
869 ret = ImageTypeProducer.getTypeProducer(code);
870 }
871 return ret;
872 }
873
874 public ImageTypeSpecifier getRawImageType(int imageIndex)
875 throws IOException {
876 setThreadLock();
877 try {
878 if (currentImage != imageIndex) {
879 cbLock.check();
880
881 readHeader(imageIndex, true);
882 }
883
884 // Returns null if it can't be represented
885 return getImageType(colorSpaceCode).getType();
886 } finally {
887 clearThreadLock();
888 }
889 }
890
891 public Iterator<ImageTypeSpecifier> getImageTypes(int imageIndex)
892 throws IOException {
893 setThreadLock();
894 try {
895 return getImageTypesOnThread(imageIndex);
896 } finally {
897 clearThreadLock();
898 }
899 }
900
901 private Iterator<ImageTypeSpecifier> getImageTypesOnThread(int imageIndex)
902 throws IOException {
903 if (currentImage != imageIndex) {
904 cbLock.check();
905 readHeader(imageIndex, true);
906 }
907
908 // We return an iterator containing the default, any
909 // conversions that the library provides, and
910 // all the other default types with the same number
911 // of components, as we can do these as a post-process.
912 // As we convert Rasters rather than images, images
913 // with alpha cannot be converted in a post-process.
914
915 // If this image can't be interpreted, this method
916 // returns an empty Iterator.
917
918 // Get the raw ITS, if there is one. Note that this
919 // won't always be the same as the default.
920 ImageTypeProducer raw = getImageType(colorSpaceCode);
921
922 // Given the encoded colorspace, build a list of ITS's
923 // representing outputs you could handle starting
924 // with the default.
925
926 ArrayList<ImageTypeProducer> list = new ArrayList<ImageTypeProducer>(1);
927
928 switch (colorSpaceCode) {
929 case JPEG.JCS_GRAYSCALE:
930 list.add(raw);
931 list.add(getImageType(JPEG.JCS_RGB));
932 break;
933 case JPEG.JCS_RGB:
934 list.add(raw);
935 list.add(getImageType(JPEG.JCS_GRAYSCALE));
936 break;
937 case JPEG.JCS_YCbCr:
938 // As there is no YCbCr ColorSpace, we can't support
939 // the raw type.
940
941 // due to 4705399, use RGB as default in order to avoid
942 // slowing down of drawing operations with result image.
943 list.add(getImageType(JPEG.JCS_RGB));
944
945 if (iccCS != null) {
946 list.add(new ImageTypeProducer() {
947 protected ImageTypeSpecifier produce() {
948 return ImageTypeSpecifier.createInterleaved
949 (iccCS,
950 JPEG.bOffsRGB, // Assume it's for RGB
951 DataBuffer.TYPE_BYTE,
952 false,
953 false);
954 }
955 });
956
957 }
958
959 list.add(getImageType(JPEG.JCS_GRAYSCALE));
960 break;
961 }
962
963 return new ImageTypeIterator(list.iterator());
964 }
965
966 /**
967 * Checks the implied color conversion between the stream and
968 * the target image, altering the IJG output color space if necessary.
969 * If a java color conversion is required, then this sets up
970 * {@code convert}.
971 * If bands are being rearranged at all (either source or destination
972 * bands are specified in the param), then the default color
973 * conversions are assumed to be correct.
974 * Throws an IIOException if there is no conversion available.
975 */
976 private void checkColorConversion(BufferedImage image,
977 ImageReadParam param)
978 throws IIOException {
979
980 // If we are rearranging channels at all, the default
981 // conversions remain in place. If the user wants
982 // raw channels then he should do this while reading
983 // a Raster.
984 if (param != null) {
985 if ((param.getSourceBands() != null) ||
986 (param.getDestinationBands() != null)) {
987 // Accept default conversions out of decoder, silently
988 return;
989 }
990 }
991
992 // XXX - We do not currently support any indexed color models,
993 // though we could, as IJG will quantize for us.
994 // This is a performance and memory-use issue, as
995 // users can read RGB and then convert to indexed in Java.
996
997 ColorModel cm = image.getColorModel();
998
999 if (cm instanceof IndexColorModel) {
1000 throw new IIOException("IndexColorModel not supported");
1001 }
1002
1003 // Now check the ColorSpace type against outColorSpaceCode
1004 // We may want to tweak the default
1005 ColorSpace cs = cm.getColorSpace();
1006 int csType = cs.getType();
1007 convert = null;
1008 switch (outColorSpaceCode) {
1009 case JPEG.JCS_GRAYSCALE: // Its gray in the file
1010 if (csType == ColorSpace.TYPE_RGB) { // We want RGB
1011 // IJG can do this for us more efficiently
1012 setOutColorSpace(structPointer, JPEG.JCS_RGB);
1013 // Update java state according to changes
1014 // in the native part of decoder.
1015 outColorSpaceCode = JPEG.JCS_RGB;
1016 numComponents = 3;
1017 } else if (csType != ColorSpace.TYPE_GRAY) {
1018 throw new IIOException("Incompatible color conversion");
1019 }
1020 break;
1021 case JPEG.JCS_RGB: // IJG wants to go to RGB
1022 if (csType == ColorSpace.TYPE_GRAY) { // We want gray
1023 if (colorSpaceCode == JPEG.JCS_YCbCr) {
1024 // If the jpeg space is YCbCr, IJG can do it
1025 setOutColorSpace(structPointer, JPEG.JCS_GRAYSCALE);
1026 // Update java state according to changes
1027 // in the native part of decoder.
1028 outColorSpaceCode = JPEG.JCS_GRAYSCALE;
1029 numComponents = 1;
1030 }
1031 } else if ((iccCS != null) &&
1032 (cm.getNumComponents() == numComponents) &&
1033 (cs != iccCS)) {
1034 // We have an ICC profile but it isn't used in the dest
1035 // image. So convert from the profile cs to the target cs
1036 convert = new ColorConvertOp(iccCS, cs, null);
1037 // Leave IJG conversion in place; we still need it
1038 } else if ((iccCS == null) &&
1039 (!cs.isCS_sRGB()) &&
1040 (cm.getNumComponents() == numComponents)) {
1041 // Target isn't sRGB, so convert from sRGB to the target
1042 convert = new ColorConvertOp(JPEG.JCS.sRGB, cs, null);
1043 } else if (csType != ColorSpace.TYPE_RGB) {
1044 throw new IIOException("Incompatible color conversion");
1045 }
1046 break;
1047 default:
1048 // Anything else we can't handle at all
1049 throw new IIOException("Incompatible color conversion");
1050 }
1051 }
1052
1053 /**
1054 * Set the IJG output space to the given value. The library will
1055 * perform the appropriate colorspace conversions.
1056 */
1057 private native void setOutColorSpace(long structPointer, int id);
1058
1059 /////// End of Color Conversion & Image Types
1060
1061 public ImageReadParam getDefaultReadParam() {
1062 return new JPEGImageReadParam();
1063 }
1064
1065 public IIOMetadata getStreamMetadata() throws IOException {
1066 setThreadLock();
1067 try {
1068 if (!tablesOnlyChecked) {
1069 cbLock.check();
1070 checkTablesOnly();
1071 }
1072 return streamMetadata;
1073 } finally {
1074 clearThreadLock();
1075 }
1076 }
1077
1078 public IIOMetadata getImageMetadata(int imageIndex)
1079 throws IOException {
1080 setThreadLock();
1081 try {
1082 // imageMetadataIndex will always be either a valid index or
1083 // -1, in which case imageMetadata will not be null.
1084 // So we can leave checking imageIndex for gotoImage.
1085 if ((imageMetadataIndex == imageIndex)
1086 && (imageMetadata != null)) {
1087 return imageMetadata;
1088 }
1089
1090 cbLock.check();
1091
1092 gotoImage(imageIndex);
1093
1094 imageMetadata = new JPEGMetadata(false, false, iis, this);
1095
1096 imageMetadataIndex = imageIndex;
1097
1098 return imageMetadata;
1099 } finally {
1100 clearThreadLock();
1101 }
1102 }
1103
1104 public BufferedImage read(int imageIndex, ImageReadParam param)
1105 throws IOException {
1106 setThreadLock();
1107 try {
1108 cbLock.check();
1109 try {
1110 readInternal(imageIndex, param, false);
1111 } catch (RuntimeException e) {
1112 resetLibraryState(structPointer);
1113 throw e;
1114 } catch (IOException e) {
1115 resetLibraryState(structPointer);
1116 throw e;
1117 }
1118
1119 BufferedImage ret = image;
1120 image = null; // don't keep a reference here
1121 return ret;
1122 } finally {
1123 clearThreadLock();
1124 }
1125 }
1126
1127 private Raster readInternal(int imageIndex,
1128 ImageReadParam param,
1129 boolean wantRaster) throws IOException {
1130 readHeader(imageIndex, false);
1131
1132 WritableRaster imRas = null;
1133 int numImageBands = 0;
1134
1135 if (!wantRaster){
1136 // Can we read this image?
1137 Iterator<ImageTypeSpecifier> imageTypes = getImageTypes(imageIndex);
1138 if (imageTypes.hasNext() == false) {
1139 throw new IIOException("Unsupported Image Type");
1140 }
1141
1142 image = getDestination(param, imageTypes, width, height);
1143 imRas = image.getRaster();
1144
1145 // The destination may still be incompatible.
1146
1147 numImageBands = image.getSampleModel().getNumBands();
1148
1149 // Check whether we can handle any implied color conversion
1150
1151 // Throws IIOException if the stream and the image are
1152 // incompatible, and sets convert if a java conversion
1153 // is necessary
1154 checkColorConversion(image, param);
1155
1156 // Check the source and destination bands in the param
1157 checkReadParamBandSettings(param, numComponents, numImageBands);
1158 } else {
1159 // Set the output color space equal to the input colorspace
1160 // This disables all conversions
1161 setOutColorSpace(structPointer, colorSpaceCode);
1162 image = null;
1163 }
1164
1165 // Create an intermediate 1-line Raster that will hold the decoded,
1166 // subsampled, clipped, band-selected image data in a single
1167 // byte-interleaved buffer. The above transformations
1168 // will occur in C for performance. Every time this Raster
1169 // is filled we will call back to acceptPixels below to copy
1170 // this to whatever kind of buffer our image has.
1171
1172 int [] srcBands = JPEG.bandOffsets[numComponents-1];
1173 int numRasterBands = (wantRaster ? numComponents : numImageBands);
1174 destinationBands = null;
1175
1176 Rectangle srcROI = new Rectangle(0, 0, 0, 0);
1177 destROI = new Rectangle(0, 0, 0, 0);
1178 computeRegions(param, width, height, image, srcROI, destROI);
1179
1180 int periodX = 1;
1181 int periodY = 1;
1182
1183 minProgressivePass = 0;
1184 maxProgressivePass = Integer.MAX_VALUE;
1185
1186 if (param != null) {
1187 periodX = param.getSourceXSubsampling();
1188 periodY = param.getSourceYSubsampling();
1189
1190 int[] sBands = param.getSourceBands();
1191 if (sBands != null) {
1192 srcBands = sBands;
1193 numRasterBands = srcBands.length;
1194 }
1195 if (!wantRaster) { // ignore dest bands for Raster
1196 destinationBands = param.getDestinationBands();
1197 }
1198
1199 minProgressivePass = param.getSourceMinProgressivePass();
1200 maxProgressivePass = param.getSourceMaxProgressivePass();
1201
1202 if (param instanceof JPEGImageReadParam) {
1203 JPEGImageReadParam jparam = (JPEGImageReadParam) param;
1204 if (jparam.areTablesSet()) {
1205 abbrevQTables = jparam.getQTables();
1206 abbrevDCHuffmanTables = jparam.getDCHuffmanTables();
1207 abbrevACHuffmanTables = jparam.getACHuffmanTables();
1208 }
1209 }
1210 }
1211
1212 int lineSize = destROI.width*numRasterBands;
1213
1214 buffer = new DataBufferByte(lineSize);
1215
1216 int [] bandOffs = JPEG.bandOffsets[numRasterBands-1];
1217
1218 raster = Raster.createInterleavedRaster(buffer,
1219 destROI.width, 1,
1220 lineSize,
1221 numRasterBands,
1222 bandOffs,
1223 null);
1224
1225 // Now that we have the Raster we'll decode to, get a view of the
1226 // target Raster that will permit a simple setRect for each scanline
1227 if (wantRaster) {
1228 target = Raster.createInterleavedRaster(DataBuffer.TYPE_BYTE,
1229 destROI.width,
1230 destROI.height,
1231 lineSize,
1232 numRasterBands,
1233 bandOffs,
1234 null);
1235 } else {
1236 target = imRas;
1237 }
1238 int [] bandSizes = target.getSampleModel().getSampleSize();
1239 for (int i = 0; i < bandSizes.length; i++) {
1240 if (bandSizes[i] <= 0 || bandSizes[i] > 8) {
1241 throw new IIOException("Illegal band size: should be 0 < size <= 8");
1242 }
1243 }
1244
1245 /*
1246 * If the process is sequential, and we have restart markers,
1247 * we could skip to the correct restart marker, if the library
1248 * lets us. That's an optimization to investigate later.
1249 */
1250
1251 // Check for update listeners (don't call back if none)
1252 boolean callbackUpdates = ((updateListeners != null)
1253 || (progressListeners != null));
1254
1255 // Set up progression data
1256 initProgressData();
1257 // if we have a metadata object, we can count the scans
1258 // and set knownPassCount
1259 if (imageIndex == imageMetadataIndex) { // We have metadata
1260 knownPassCount = 0;
1261 for (Iterator<MarkerSegment> iter =
1262 imageMetadata.markerSequence.iterator(); iter.hasNext();) {
1263 if (iter.next() instanceof SOSMarkerSegment) {
1264 knownPassCount++;
1265 }
1266 }
1267 }
1268 progInterval = Math.max((target.getHeight()-1) / 20, 1);
1269 if (knownPassCount > 0) {
1270 progInterval *= knownPassCount;
1271 } else if (maxProgressivePass != Integer.MAX_VALUE) {
1272 progInterval *= (maxProgressivePass - minProgressivePass + 1);
1273 }
1274
1275 if (debug) {
1276 System.out.println("**** Read Data *****");
1277 System.out.println("numRasterBands is " + numRasterBands);
1278 System.out.print("srcBands:");
1279 for (int i = 0; i<srcBands.length;i++)
1280 System.out.print(" " + srcBands[i]);
1281 System.out.println();
1282 System.out.println("destination bands is " + destinationBands);
1283 if (destinationBands != null) {
1284 for (int i = 0; i < destinationBands.length; i++) {
1285 System.out.print(" " + destinationBands[i]);
1286 }
1287 System.out.println();
1288 }
1289 System.out.println("sourceROI is " + srcROI);
1290 System.out.println("destROI is " + destROI);
1291 System.out.println("periodX is " + periodX);
1292 System.out.println("periodY is " + periodY);
1293 System.out.println("minProgressivePass is " + minProgressivePass);
1294 System.out.println("maxProgressivePass is " + maxProgressivePass);
1295 System.out.println("callbackUpdates is " + callbackUpdates);
1296 }
1297
1298 /*
1299 * All the Jpeg processing happens in native, we should clear
1300 * abortFlag of imageIODataStruct in imageioJPEG.c. And we need to
1301 * clear abortFlag because if in previous read() if we had called
1302 * reader.abort() that will continue to be valid for present call also.
1303 */
1304 clearNativeReadAbortFlag(structPointer);
1305 processImageStarted(currentImage);
1306 /*
1307 * Note that getData disables acceleration on buffer, but it is
1308 * just a 1-line intermediate data transfer buffer that will not
1309 * affect the acceleration of the resulting image.
1310 */
1311 boolean aborted = readImage(imageIndex,
1312 structPointer,
1313 buffer.getData(),
1314 numRasterBands,
1315 srcBands,
1316 bandSizes,
1317 srcROI.x, srcROI.y,
1318 srcROI.width, srcROI.height,
1319 periodX, periodY,
1320 abbrevQTables,
1321 abbrevDCHuffmanTables,
1322 abbrevACHuffmanTables,
1323 minProgressivePass, maxProgressivePass,
1324 callbackUpdates);
1325
1326 if (aborted) {
1327 processReadAborted();
1328 } else {
1329 processImageComplete();
1330 }
1331
1332 return target;
1333
1334 }
1335
1336 /**
1337 * This method is called back from C when the intermediate Raster
1338 * is full. The parameter indicates the scanline in the target
1339 * Raster to which the intermediate Raster should be copied.
1340 * After the copy, we notify update listeners.
1341 */
1342 private void acceptPixels(int y, boolean progressive) {
1343 if (convert != null) {
1344 convert.filter(raster, raster);
1345 }
1346 target.setRect(destROI.x, destROI.y + y, raster);
1347
1348 cbLock.lock();
1349 try {
1350 processImageUpdate(image,
1351 destROI.x, destROI.y+y,
1352 raster.getWidth(), 1,
1353 1, 1,
1354 destinationBands);
1355 if ((y > 0) && (y%progInterval == 0)) {
1356 int height = target.getHeight()-1;
1357 float percentOfPass = ((float)y)/height;
1358 if (progressive) {
1359 if (knownPassCount != UNKNOWN) {
1360 processImageProgress((pass + percentOfPass)*100.0F
1361 / knownPassCount);
1362 } else if (maxProgressivePass != Integer.MAX_VALUE) {
1363 // Use the range of allowed progressive passes
1364 processImageProgress((pass + percentOfPass)*100.0F
1365 / (maxProgressivePass - minProgressivePass + 1));
1366 } else {
1367 // Assume there are a minimum of MIN_ESTIMATED_PASSES
1368 // and that there is always one more pass
1369 // Compute the percentage as the percentage at the end
1370 // of the previous pass, plus the percentage of this
1371 // pass scaled to be the percentage of the total remaining,
1372 // assuming a minimum of MIN_ESTIMATED_PASSES passes and
1373 // that there is always one more pass. This is monotonic
1374 // and asymptotic to 1.0, which is what we need.
1375 int remainingPasses = // including this one
1376 Math.max(2, MIN_ESTIMATED_PASSES-pass);
1377 int totalPasses = pass + remainingPasses-1;
1378 progInterval = Math.max(height/20*totalPasses,
1379 totalPasses);
1380 if (y%progInterval == 0) {
1381 percentToDate = previousPassPercentage +
1382 (1.0F - previousPassPercentage)
1383 * (percentOfPass)/remainingPasses;
1384 if (debug) {
1385 System.out.print("pass= " + pass);
1386 System.out.print(", y= " + y);
1387 System.out.print(", progInt= " + progInterval);
1388 System.out.print(", % of pass: " + percentOfPass);
1389 System.out.print(", rem. passes: "
1390 + remainingPasses);
1391 System.out.print(", prev%: "
1392 + previousPassPercentage);
1393 System.out.print(", %ToDate: " + percentToDate);
1394 System.out.print(" ");
1395 }
1396 processImageProgress(percentToDate*100.0F);
1397 }
1398 }
1399 } else {
1400 processImageProgress(percentOfPass * 100.0F);
1401 }
1402 }
1403 } finally {
1404 cbLock.unlock();
1405 }
1406 }
1407
1408 private void initProgressData() {
1409 knownPassCount = UNKNOWN;
1410 pass = 0;
1411 percentToDate = 0.0F;
1412 previousPassPercentage = 0.0F;
1413 progInterval = 0;
1414 }
1415
1416 private void passStarted (int pass) {
1417 cbLock.lock();
1418 try {
1419 this.pass = pass;
1420 previousPassPercentage = percentToDate;
1421 processPassStarted(image,
1422 pass,
1423 minProgressivePass,
1424 maxProgressivePass,
1425 0, 0,
1426 1,1,
1427 destinationBands);
1428 } finally {
1429 cbLock.unlock();
1430 }
1431 }
1432
1433 private void passComplete () {
1434 cbLock.lock();
1435 try {
1436 processPassComplete(image);
1437 } finally {
1438 cbLock.unlock();
1439 }
1440 }
1441
1442 void thumbnailStarted(int thumbnailIndex) {
1443 cbLock.lock();
1444 try {
1445 processThumbnailStarted(currentImage, thumbnailIndex);
1446 } finally {
1447 cbLock.unlock();
1448 }
1449 }
1450
1451 // Provide access to protected superclass method
1452 void thumbnailProgress(float percentageDone) {
1453 cbLock.lock();
1454 try {
1455 processThumbnailProgress(percentageDone);
1456 } finally {
1457 cbLock.unlock();
1458 }
1459 }
1460
1461 // Provide access to protected superclass method
1462 void thumbnailComplete() {
1463 cbLock.lock();
1464 try {
1465 processThumbnailComplete();
1466 } finally {
1467 cbLock.unlock();
1468 }
1469 }
1470
1471 /**
1472 * Returns {@code true} if the read was aborted.
1473 */
1474 private native boolean readImage(int imageIndex,
1475 long structPointer,
1476 byte [] buffer,
1477 int numRasterBands,
1478 int [] srcBands,
1479 int [] bandSizes,
1480 int sourceXOffset, int sourceYOffset,
1481 int sourceWidth, int sourceHeight,
1482 int periodX, int periodY,
1483 JPEGQTable [] abbrevQTables,
1484 JPEGHuffmanTable [] abbrevDCHuffmanTables,
1485 JPEGHuffmanTable [] abbrevACHuffmanTables,
1486 int minProgressivePass,
1487 int maxProgressivePass,
1488 boolean wantUpdates);
1489
1490 /*
1491 * We should call clearNativeReadAbortFlag() before we start reading
1492 * jpeg image as image processing happens at native side.
1493 */
1494 private native void clearNativeReadAbortFlag(long structPointer);
1495
1496 public void abort() {
1497 setThreadLock();
1498 try {
1499 /**
1500 * NB: we do not check the call back lock here,
1501 * we allow to abort the reader any time.
1502 */
1503
1504 super.abort();
1505 abortRead(structPointer);
1506 } finally {
1507 clearThreadLock();
1508 }
1509 }
1510
1511 /** Set the C level abort flag. Keep it atomic for thread safety. */
1512 private native void abortRead(long structPointer);
1513
1514 /** Resets library state when an exception occurred during a read. */
1515 private native void resetLibraryState(long structPointer);
1516
1517 public boolean canReadRaster() {
1518 return true;
1519 }
1520
1521 public Raster readRaster(int imageIndex, ImageReadParam param)
1522 throws IOException {
1523 setThreadLock();
1524 Raster retval = null;
1525 try {
1526 cbLock.check();
1527 /*
1528 * This could be further optimized by not resetting the dest.
1529 * offset and creating a translated raster in readInternal()
1530 * (see bug 4994702 for more info).
1531 */
1532
1533 // For Rasters, destination offset is logical, not physical, so
1534 // set it to 0 before calling computeRegions, so that the destination
1535 // region is not clipped.
1536 Point saveDestOffset = null;
1537 if (param != null) {
1538 saveDestOffset = param.getDestinationOffset();
1539 param.setDestinationOffset(new Point(0, 0));
1540 }
1541 retval = readInternal(imageIndex, param, true);
1542 // Apply the destination offset, if any, as a logical offset
1543 if (saveDestOffset != null) {
1544 target = target.createWritableTranslatedChild(saveDestOffset.x,
1545 saveDestOffset.y);
1546 }
1547 } catch (RuntimeException e) {
1548 resetLibraryState(structPointer);
1549 throw e;
1550 } catch (IOException e) {
1551 resetLibraryState(structPointer);
1552 throw e;
1553 } finally {
1554 clearThreadLock();
1555 }
1556 return retval;
1557 }
1558
1559 public boolean readerSupportsThumbnails() {
1560 return true;
1561 }
1562
1563 public int getNumThumbnails(int imageIndex) throws IOException {
1564 setThreadLock();
1565 try {
1566 cbLock.check();
1567
1568 getImageMetadata(imageIndex); // checks iis state for us
1569 // Now check the jfif segments
1570 JFIFMarkerSegment jfif =
1571 (JFIFMarkerSegment) imageMetadata.findMarkerSegment
1572 (JFIFMarkerSegment.class, true);
1573 int retval = 0;
1574 if (jfif != null) {
1575 retval = (jfif.thumb == null) ? 0 : 1;
1576 retval += jfif.extSegments.size();
1577 }
1578 return retval;
1579 } finally {
1580 clearThreadLock();
1581 }
1582 }
1583
1584 public int getThumbnailWidth(int imageIndex, int thumbnailIndex)
1585 throws IOException {
1586 setThreadLock();
1587 try {
1588 cbLock.check();
1589
1590 if ((thumbnailIndex < 0)
1591 || (thumbnailIndex >= getNumThumbnails(imageIndex))) {
1592 throw new IndexOutOfBoundsException("No such thumbnail");
1593 }
1594 // Now we know that there is a jfif segment
1595 JFIFMarkerSegment jfif =
1596 (JFIFMarkerSegment) imageMetadata.findMarkerSegment
1597 (JFIFMarkerSegment.class, true);
1598 return jfif.getThumbnailWidth(thumbnailIndex);
1599 } finally {
1600 clearThreadLock();
1601 }
1602 }
1603
1604 public int getThumbnailHeight(int imageIndex, int thumbnailIndex)
1605 throws IOException {
1606 setThreadLock();
1607 try {
1608 cbLock.check();
1609
1610 if ((thumbnailIndex < 0)
1611 || (thumbnailIndex >= getNumThumbnails(imageIndex))) {
1612 throw new IndexOutOfBoundsException("No such thumbnail");
1613 }
1614 // Now we know that there is a jfif segment
1615 JFIFMarkerSegment jfif =
1616 (JFIFMarkerSegment) imageMetadata.findMarkerSegment
1617 (JFIFMarkerSegment.class, true);
1618 return jfif.getThumbnailHeight(thumbnailIndex);
1619 } finally {
1620 clearThreadLock();
1621 }
1622 }
1623
1624 public BufferedImage readThumbnail(int imageIndex,
1625 int thumbnailIndex)
1626 throws IOException {
1627 setThreadLock();
1628 try {
1629 cbLock.check();
1630
1631 if ((thumbnailIndex < 0)
1632 || (thumbnailIndex >= getNumThumbnails(imageIndex))) {
1633 throw new IndexOutOfBoundsException("No such thumbnail");
1634 }
1635 // Now we know that there is a jfif segment and that iis is good
1636 JFIFMarkerSegment jfif =
1637 (JFIFMarkerSegment) imageMetadata.findMarkerSegment
1638 (JFIFMarkerSegment.class, true);
1639 return jfif.getThumbnail(iis, thumbnailIndex, this);
1640 } finally {
1641 clearThreadLock();
1642 }
1643 }
1644
1645 private void resetInternalState() {
1646 // reset C structures
1647 resetReader(structPointer);
1648
1649 // reset local Java structures
1650 numImages = 0;
1651 imagePositions = new ArrayList<>();
1652 currentImage = -1;
1653 image = null;
1654 raster = null;
1655 target = null;
1656 buffer = null;
1657 destROI = null;
1658 destinationBands = null;
1659 streamMetadata = null;
1660 imageMetadata = null;
1661 imageMetadataIndex = -1;
1662 haveSeeked = false;
1663 tablesOnlyChecked = false;
1664 iccCS = null;
1665 initProgressData();
1666 }
1667
1668 public void reset() {
1669 setThreadLock();
1670 try {
1671 cbLock.check();
1672 super.reset();
1673 } finally {
1674 clearThreadLock();
1675 }
1676 }
1677
1678 private native void resetReader(long structPointer);
1679
1680 public void dispose() {
1681 setThreadLock();
1682 try {
1683 cbLock.check();
1684
1685 if (structPointer != 0) {
1686 disposerRecord.dispose();
1687 structPointer = 0;
1688 }
1689 } finally {
1690 clearThreadLock();
1691 }
1692 }
1693
1694 private static native void disposeReader(long structPointer);
1695
1696 private static class JPEGReaderDisposerRecord implements DisposerRecord {
1697 private long pData;
1698
1699 public JPEGReaderDisposerRecord(long pData) {
1700 this.pData = pData;
1701 }
1702
1703 public synchronized void dispose() {
1704 if (pData != 0) {
1705 disposeReader(pData);
1706 pData = 0;
1707 }
1708 }
1709 }
1710
1711 private Thread theThread = null;
1712 private int theLockCount = 0;
1713
1714 private synchronized void setThreadLock() {
1715 Thread currThread = Thread.currentThread();
1716 if (theThread != null) {
1717 if (theThread != currThread) {
1718 // it looks like that this reader instance is used
1719 // by multiple threads.
1720 throw new IllegalStateException("Attempt to use instance of " +
1721 this + " locked on thread " +
1722 theThread + " from thread " +
1723 currThread);
1724 } else {
1725 theLockCount ++;
1726 }
1727 } else {
1728 theThread = currThread;
1729 theLockCount = 1;
1730 }
1731 }
1732
1733 private synchronized void clearThreadLock() {
1734 Thread currThread = Thread.currentThread();
1735 if (theThread == null || theThread != currThread) {
1736 throw new IllegalStateException("Attempt to clear thread lock " +
1737 " form wrong thread." +
1738 " Locked thread: " + theThread +
1739 "; current thread: " + currThread);
1740 }
1741 theLockCount --;
1742 if (theLockCount == 0) {
1743 theThread = null;
1744 }
1745 }
1746
1747 private CallBackLock cbLock = new CallBackLock();
1748
1749 private static class CallBackLock {
1750
1751 private State lockState;
1752
1753 CallBackLock() {
1754 lockState = State.Unlocked;
1755 }
1756
1757 void check() {
1758 if (lockState != State.Unlocked) {
1759 throw new IllegalStateException("Access to the reader is not allowed");
1760 }
1761 }
1762
1763 private void lock() {
1764 lockState = State.Locked;
1765 }
1766
1767 private void unlock() {
1768 lockState = State.Unlocked;
1769 }
1770
1771 private static enum State {
1772 Unlocked,
1773 Locked
1774 }
1775 }
1776 }
1777
1778 /**
1779 * An internal helper class that wraps producer's iterator
1780 * and extracts specifier instances on demand.
1781 */
1782 class ImageTypeIterator implements Iterator<ImageTypeSpecifier> {
1783 private Iterator<ImageTypeProducer> producers;
1784 private ImageTypeSpecifier theNext = null;
1785
1786 public ImageTypeIterator(Iterator<ImageTypeProducer> producers) {
1787 this.producers = producers;
1788 }
1789
1790 public boolean hasNext() {
1791 if (theNext != null) {
1792 return true;
1793 }
1794 if (!producers.hasNext()) {
1795 return false;
1796 }
1797 do {
1798 theNext = producers.next().getType();
1799 } while (theNext == null && producers.hasNext());
1800
1801 return (theNext != null);
1802 }
1803
1804 public ImageTypeSpecifier next() {
1805 if (theNext != null || hasNext()) {
1806 ImageTypeSpecifier t = theNext;
1807 theNext = null;
1808 return t;
1809 } else {
1810 throw new NoSuchElementException();
1811 }
1812 }
1813
1814 public void remove() {
1815 producers.remove();
1816 }
1817 }
1818
1819 /**
1820 * An internal helper class that provides means for deferred creation
1821 * of ImageTypeSpecifier instance required to describe available
1822 * destination types.
1823 *
1824 * This implementation only supports standard
1825 * jpeg color spaces (defined by corresponding JCS color space code).
1826 *
1827 * To support other color spaces one can override produce() method to
1828 * return custom instance of ImageTypeSpecifier.
1829 */
1830 class ImageTypeProducer {
1831
1832 private ImageTypeSpecifier type = null;
1833 boolean failed = false;
1834 private int csCode;
1835
1836 public ImageTypeProducer(int csCode) {
1837 this.csCode = csCode;
1838 }
1839
1840 public ImageTypeProducer() {
1841 csCode = -1; // undefined
1842 }
1843
1844 public synchronized ImageTypeSpecifier getType() {
1845 if (!failed && type == null) {
1846 try {
1847 type = produce();
1848 } catch (Throwable e) {
1849 failed = true;
1850 }
1851 }
1852 return type;
1853 }
1854
1855 private static final ImageTypeProducer [] defaultTypes =
1856 new ImageTypeProducer [JPEG.NUM_JCS_CODES];
1857
1858 public static synchronized ImageTypeProducer getTypeProducer(int csCode) {
1859 if (csCode < 0 || csCode >= JPEG.NUM_JCS_CODES) {
1860 return null;
1861 }
1862 if (defaultTypes[csCode] == null) {
1863 defaultTypes[csCode] = new ImageTypeProducer(csCode);
1864 }
1865 return defaultTypes[csCode];
1866 }
1867
1868 protected ImageTypeSpecifier produce() {
1869 switch (csCode) {
1870 case JPEG.JCS_GRAYSCALE:
1871 return ImageTypeSpecifier.createFromBufferedImageType
1872 (BufferedImage.TYPE_BYTE_GRAY);
1873 case JPEG.JCS_YCbCr:
1874 //there is no YCbCr raw type so by default we assume it as RGB
1875 case JPEG.JCS_RGB:
1876 return ImageTypeSpecifier.createInterleaved(JPEG.JCS.sRGB,
1877 JPEG.bOffsRGB,
1878 DataBuffer.TYPE_BYTE,
1879 false,
1880 false);
1881 default:
1882 return null;
1883 }
1884 }
1885 }