-
Notifications
You must be signed in to change notification settings - Fork 5.4k
/
JPEGImageWriter.java
1842 lines (1648 loc) · 67.5 KB
/
JPEGImageWriter.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.imageio.plugins.jpeg;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.awt.color.ICC_ColorSpace;
import java.awt.color.ICC_Profile;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.awt.image.ColorModel;
import java.awt.image.DataBufferByte;
import java.awt.image.IndexColorModel;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.WritableRaster;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.IIOException;
import javax.imageio.IIOImage;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataFormatImpl;
import javax.imageio.plugins.jpeg.JPEGHuffmanTable;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
import javax.imageio.plugins.jpeg.JPEGQTable;
import javax.imageio.spi.ImageWriterSpi;
import javax.imageio.stream.ImageOutputStream;
import com.sun.imageio.plugins.common.ImageUtil;
import org.w3c.dom.Node;
import sun.java2d.Disposer;
import sun.java2d.DisposerRecord;
public class JPEGImageWriter extends ImageWriter {
///////// Private variables
private boolean debug = false;
/**
* The following variable contains a pointer to the IJG library
* structure for this reader. It is assigned in the constructor
* and then is passed in to every native call. It is set to 0
* by dispose to avoid disposing twice.
*/
private long structPointer = 0;
/** The output stream we write to */
private ImageOutputStream ios = null;
/** The Raster we will write from */
private Raster srcRas = null;
/** An intermediate Raster holding compressor-friendly data */
private WritableRaster raster = null;
/**
* Set to true if we are writing an image with an
* indexed ColorModel
*/
private boolean indexed = false;
private IndexColorModel indexCM = null;
private boolean convertTosRGB = false; // Used by PhotoYCC only
private WritableRaster converted = null;
private boolean isAlphaPremultiplied = false;
private ColorModel srcCM = null;
/**
* If there are thumbnails to be written, this is the list.
*/
private List<? extends BufferedImage> thumbnails = null;
/**
* If metadata should include an icc profile, store it here.
*/
private ICC_Profile iccProfile = null;
private int sourceXOffset = 0;
private int sourceYOffset = 0;
private int sourceWidth = 0;
private int [] srcBands = null;
private int sourceHeight = 0;
/** Used when calling listeners */
private int currentImage = 0;
private ColorConvertOp convertOp = null;
private JPEGQTable [] streamQTables = null;
private JPEGHuffmanTable[] streamDCHuffmanTables = null;
private JPEGHuffmanTable[] streamACHuffmanTables = null;
// Parameters for writing metadata
private boolean ignoreJFIF = false; // If it's there, use it
private boolean forceJFIF = false; // Add one for the thumbnails
private boolean ignoreAdobe = false; // If it's there, use it
private int newAdobeTransform = JPEG.ADOBE_IMPOSSIBLE; // Change if needed
private boolean writeDefaultJFIF = false;
private boolean writeAdobe = false;
private JPEGMetadata metadata = null;
private boolean sequencePrepared = false;
private int numScans = 0;
/** The referent to be registered with the Disposer. */
private Object disposerReferent = new Object();
/** The DisposerRecord that handles the actual disposal of this writer. */
private DisposerRecord disposerRecord;
///////// End of Private variables
///////// Protected variables
protected static final int WARNING_DEST_IGNORED = 0;
protected static final int WARNING_STREAM_METADATA_IGNORED = 1;
protected static final int WARNING_DEST_METADATA_COMP_MISMATCH = 2;
protected static final int WARNING_DEST_METADATA_JFIF_MISMATCH = 3;
protected static final int WARNING_DEST_METADATA_ADOBE_MISMATCH = 4;
protected static final int WARNING_IMAGE_METADATA_JFIF_MISMATCH = 5;
protected static final int WARNING_IMAGE_METADATA_ADOBE_MISMATCH = 6;
protected static final int WARNING_METADATA_NOT_JPEG_FOR_RASTER = 7;
protected static final int WARNING_NO_BANDS_ON_INDEXED = 8;
protected static final int WARNING_ILLEGAL_THUMBNAIL = 9;
protected static final int WARNING_IGNORING_THUMBS = 10;
protected static final int WARNING_FORCING_JFIF = 11;
protected static final int WARNING_THUMB_CLIPPED = 12;
protected static final int WARNING_METADATA_ADJUSTED_FOR_THUMB = 13;
protected static final int WARNING_NO_RGB_THUMB_AS_INDEXED = 14;
protected static final int WARNING_NO_GRAY_THUMB_AS_INDEXED = 15;
private static final int MAX_WARNING = WARNING_NO_GRAY_THUMB_AS_INDEXED;
///////// End of Protected variables
///////// static initializer
static {
initStatic();
}
@SuppressWarnings("removal")
private static void initStatic() {
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction<Void>() {
@Override
public Void run() {
System.loadLibrary("javajpeg");
return null;
}
});
initWriterIDs(JPEGQTable.class,
JPEGHuffmanTable.class);
}
//////// Public API
public JPEGImageWriter(ImageWriterSpi originator) {
super(originator);
structPointer = initJPEGImageWriter();
disposerRecord = new JPEGWriterDisposerRecord(structPointer);
Disposer.addRecord(disposerReferent, disposerRecord);
}
@Override
public void setOutput(Object output) {
setThreadLock();
try {
cbLock.check();
super.setOutput(output); // validates output
resetInternalState();
ios = (ImageOutputStream) output; // so this will always work
// Set the native destination
setDest(structPointer);
} finally {
clearThreadLock();
}
}
@Override
public ImageWriteParam getDefaultWriteParam() {
return new JPEGImageWriteParam(null);
}
@Override
public IIOMetadata getDefaultStreamMetadata(ImageWriteParam param) {
setThreadLock();
try {
return new JPEGMetadata(param, this);
} finally {
clearThreadLock();
}
}
@Override
public IIOMetadata
getDefaultImageMetadata(ImageTypeSpecifier imageType,
ImageWriteParam param) {
setThreadLock();
try {
return new JPEGMetadata(imageType, param, this);
} finally {
clearThreadLock();
}
}
@Override
public IIOMetadata convertStreamMetadata(IIOMetadata inData,
ImageWriteParam param) {
// There isn't much we can do. If it's one of ours, then
// return it. Otherwise just return null. We use it only
// for tables, so we can't get a default and modify it,
// as this will usually not be what is intended.
if (inData instanceof JPEGMetadata) {
JPEGMetadata jpegData = (JPEGMetadata) inData;
if (jpegData.isStream) {
return inData;
}
}
return null;
}
@Override
public IIOMetadata
convertImageMetadata(IIOMetadata inData,
ImageTypeSpecifier imageType,
ImageWriteParam param) {
setThreadLock();
try {
return convertImageMetadataOnThread(inData, imageType, param);
} finally {
clearThreadLock();
}
}
private IIOMetadata
convertImageMetadataOnThread(IIOMetadata inData,
ImageTypeSpecifier imageType,
ImageWriteParam param) {
// If it's one of ours, just return it
if (inData instanceof JPEGMetadata) {
JPEGMetadata jpegData = (JPEGMetadata) inData;
if (!jpegData.isStream) {
return inData;
} else {
// Can't convert stream metadata to image metadata
// XXX Maybe this should put out a warning?
return null;
}
}
// If it's not one of ours, create a default and set it from
// the standard tree from the input, if it exists.
if (inData.isStandardMetadataFormatSupported()) {
String formatName =
IIOMetadataFormatImpl.standardMetadataFormatName;
Node tree = inData.getAsTree(formatName);
if (tree != null) {
JPEGMetadata jpegData = new JPEGMetadata(imageType,
param,
this);
try {
jpegData.setFromTree(formatName, tree);
} catch (IIOInvalidTreeException e) {
// Other plug-in generates bogus standard tree
// XXX Maybe this should put out a warning?
return null;
}
return jpegData;
}
}
return null;
}
@Override
public int getNumThumbnailsSupported(ImageTypeSpecifier imageType,
ImageWriteParam param,
IIOMetadata streamMetadata,
IIOMetadata imageMetadata) {
// Check whether sufficient data is available.
if (imageType == null && imageMetadata == null) {
// The method has been invoked with insufficient data. Henceforth
// we return -1 as recommended by ImageWriter specification.
return -1;
}
// Check if the image type and metadata are JFIF compatible.
if (jfifOK(imageType, param, streamMetadata, imageMetadata)) {
return Integer.MAX_VALUE;
}
return 0;
}
static final Dimension [] preferredThumbSizes = {new Dimension(1, 1),
new Dimension(255, 255)};
@Override
public Dimension[] getPreferredThumbnailSizes(ImageTypeSpecifier imageType,
ImageWriteParam param,
IIOMetadata streamMetadata,
IIOMetadata imageMetadata) {
if (jfifOK(imageType, param, streamMetadata, imageMetadata)) {
return preferredThumbSizes.clone();
}
return null;
}
private boolean jfifOK(ImageTypeSpecifier imageType,
ImageWriteParam param,
IIOMetadata streamMetadata,
IIOMetadata imageMetadata) {
// If the image type and metadata are JFIF compatible, return true
if ((imageType != null) &&
(!JPEG.isJFIFcompliant(imageType, true))) {
return false;
}
if (imageMetadata != null) {
JPEGMetadata metadata = null;
if (imageMetadata instanceof JPEGMetadata) {
metadata = (JPEGMetadata) imageMetadata;
} else {
metadata = (JPEGMetadata)convertImageMetadata(imageMetadata,
imageType,
param);
}
// metadata must have a jfif node
if (metadata.findMarkerSegment
(JFIFMarkerSegment.class, true) == null){
return false;
}
}
return true;
}
@Override
public boolean canWriteRasters() {
return true;
}
@Override
public void write(IIOMetadata streamMetadata,
IIOImage image,
ImageWriteParam param) throws IOException {
setThreadLock();
try {
cbLock.check();
writeOnThread(streamMetadata, image, param);
} finally {
clearThreadLock();
}
}
private void writeOnThread(IIOMetadata streamMetadata,
IIOImage image,
ImageWriteParam param) throws IOException {
if (ios == null) {
throw new IllegalStateException("Output has not been set!");
}
if (image == null) {
throw new IllegalArgumentException("image is null!");
}
// if streamMetadata is not null, issue a warning
if (streamMetadata != null) {
warningOccurred(WARNING_STREAM_METADATA_IGNORED);
}
// Obtain the raster and image, if there is one
boolean rasterOnly = image.hasRaster();
RenderedImage rimage = null;
if (rasterOnly) {
srcRas = image.getRaster();
} else {
rimage = image.getRenderedImage();
if (rimage instanceof BufferedImage) {
// Use the Raster directly.
srcRas = ((BufferedImage)rimage).getRaster();
} else if (rimage.getNumXTiles() == 1 &&
rimage.getNumYTiles() == 1)
{
// Get the unique tile.
srcRas = rimage.getTile(rimage.getMinTileX(),
rimage.getMinTileY());
// Ensure the Raster has dimensions of the image,
// as the tile dimensions might differ.
if (srcRas.getWidth() != rimage.getWidth() ||
srcRas.getHeight() != rimage.getHeight())
{
srcRas = srcRas.createChild(srcRas.getMinX(),
srcRas.getMinY(),
rimage.getWidth(),
rimage.getHeight(),
srcRas.getMinX(),
srcRas.getMinY(),
null);
}
} else {
// Image is tiled so get a contiguous raster by copying.
srcRas = rimage.getData();
}
}
// Now determine if we are using a band subset
// By default, we are using all source bands
int numSrcBands = srcRas.getNumBands();
indexed = false;
indexCM = null;
ColorModel cm = null;
ColorSpace cs = null;
isAlphaPremultiplied = false;
srcCM = null;
if (!rasterOnly) {
cm = rimage.getColorModel();
if (cm != null) {
cs = cm.getColorSpace();
if (cm instanceof IndexColorModel) {
indexed = true;
indexCM = (IndexColorModel) cm;
numSrcBands = cm.getNumComponents();
}
if (cm.isAlphaPremultiplied()) {
isAlphaPremultiplied = true;
srcCM = cm;
}
}
}
srcBands = JPEG.bandOffsets[numSrcBands-1];
int numBandsUsed = numSrcBands;
// Consult the param to determine if we're writing a subset
if (param != null) {
int[] sBands = param.getSourceBands();
if (sBands != null) {
if (indexed) {
warningOccurred(WARNING_NO_BANDS_ON_INDEXED);
} else {
srcBands = sBands;
numBandsUsed = srcBands.length;
if (numBandsUsed > numSrcBands) {
throw new IIOException
("ImageWriteParam specifies too many source bands");
}
}
}
}
boolean usingBandSubset = (numBandsUsed != numSrcBands);
boolean fullImage = ((!rasterOnly) && (!usingBandSubset));
int [] bandSizes = null;
if (!indexed) {
bandSizes = srcRas.getSampleModel().getSampleSize();
// If this is a subset, we must adjust bandSizes
if (usingBandSubset) {
int [] temp = new int [numBandsUsed];
for (int i = 0; i < numBandsUsed; i++) {
temp[i] = bandSizes[srcBands[i]];
}
bandSizes = temp;
}
} else {
int [] tempSize = srcRas.getSampleModel().getSampleSize();
bandSizes = new int [numSrcBands];
for (int i = 0; i < numSrcBands; i++) {
bandSizes[i] = tempSize[0]; // All the same
}
}
for (int i = 0; i < bandSizes.length; i++) {
// 4450894 part 1: The IJG libraries are compiled so they only
// handle <= 8-bit samples. We now check the band sizes and throw
// an exception for images, such as USHORT_GRAY, with > 8 bits
// per sample.
if (bandSizes[i] <= 0 || bandSizes[i] > 8) {
throw new IIOException("Illegal band size: should be 0 < size <= 8");
}
// 4450894 part 2: We expand IndexColorModel images to full 24-
// or 32-bit in grabPixels() for each scanline. For indexed
// images such as BYTE_BINARY, we need to ensure that we update
// bandSizes to account for the scaling from 1-bit band sizes
// to 8-bit.
if (indexed) {
bandSizes[i] = 8;
}
}
if (debug) {
System.out.println("numSrcBands is " + numSrcBands);
System.out.println("numBandsUsed is " + numBandsUsed);
System.out.println("usingBandSubset is " + usingBandSubset);
System.out.println("fullImage is " + fullImage);
System.out.print("Band sizes:");
for (int i = 0; i< bandSizes.length; i++) {
System.out.print(" " + bandSizes[i]);
}
System.out.println();
}
// Destination type, if there is one
ImageTypeSpecifier destType = null;
if (param != null) {
destType = param.getDestinationType();
// Ignore dest type if we are writing a complete image
if ((fullImage) && (destType != null)) {
warningOccurred(WARNING_DEST_IGNORED);
destType = null;
}
}
// Examine the param
sourceXOffset = srcRas.getMinX();
sourceYOffset = srcRas.getMinY();
int imageWidth = srcRas.getWidth();
int imageHeight = srcRas.getHeight();
sourceWidth = imageWidth;
sourceHeight = imageHeight;
int periodX = 1;
int periodY = 1;
int gridX = 0;
int gridY = 0;
JPEGQTable [] qTables = null;
JPEGHuffmanTable[] DCHuffmanTables = null;
JPEGHuffmanTable[] ACHuffmanTables = null;
boolean optimizeHuffman = false;
JPEGImageWriteParam jparam = null;
int progressiveMode = ImageWriteParam.MODE_DISABLED;
if (param != null) {
Rectangle sourceRegion = param.getSourceRegion();
if (sourceRegion != null) {
Rectangle imageBounds = new Rectangle(sourceXOffset,
sourceYOffset,
sourceWidth,
sourceHeight);
sourceRegion = sourceRegion.intersection(imageBounds);
sourceXOffset = sourceRegion.x;
sourceYOffset = sourceRegion.y;
sourceWidth = sourceRegion.width;
sourceHeight = sourceRegion.height;
}
if (sourceWidth + sourceXOffset > imageWidth) {
sourceWidth = imageWidth - sourceXOffset;
}
if (sourceHeight + sourceYOffset > imageHeight) {
sourceHeight = imageHeight - sourceYOffset;
}
periodX = param.getSourceXSubsampling();
periodY = param.getSourceYSubsampling();
gridX = param.getSubsamplingXOffset();
gridY = param.getSubsamplingYOffset();
switch(param.getCompressionMode()) {
case ImageWriteParam.MODE_DISABLED:
throw new IIOException("JPEG compression cannot be disabled");
case ImageWriteParam.MODE_EXPLICIT:
float quality = param.getCompressionQuality();
quality = JPEG.convertToLinearQuality(quality);
qTables = new JPEGQTable[2];
qTables[0] = JPEGQTable.K1Luminance.getScaledInstance
(quality, true);
qTables[1] = JPEGQTable.K2Chrominance.getScaledInstance
(quality, true);
break;
case ImageWriteParam.MODE_DEFAULT:
qTables = new JPEGQTable[2];
qTables[0] = JPEGQTable.K1Div2Luminance;
qTables[1] = JPEGQTable.K2Div2Chrominance;
break;
// We'll handle the metadata case later
}
progressiveMode = param.getProgressiveMode();
if (param instanceof JPEGImageWriteParam) {
jparam = (JPEGImageWriteParam)param;
optimizeHuffman = jparam.getOptimizeHuffmanTables();
}
}
// Now examine the metadata
IIOMetadata mdata = image.getMetadata();
if (mdata != null) {
if (mdata instanceof JPEGMetadata) {
metadata = (JPEGMetadata) mdata;
if (debug) {
System.out.println
("We have metadata, and it's JPEG metadata");
}
} else {
if (!rasterOnly) {
ImageTypeSpecifier type = destType;
if (type == null) {
type = new ImageTypeSpecifier(rimage);
}
metadata = (JPEGMetadata) convertImageMetadata(mdata,
type,
param);
} else {
warningOccurred(WARNING_METADATA_NOT_JPEG_FOR_RASTER);
}
}
}
// First set a default state
ignoreJFIF = false; // If it's there, use it
ignoreAdobe = false; // If it's there, use it
newAdobeTransform = JPEG.ADOBE_IMPOSSIBLE; // Change if needed
writeDefaultJFIF = false;
writeAdobe = false;
// By default we'll do no conversion:
int inCsType = JPEG.JCS_UNKNOWN;
int outCsType = JPEG.JCS_UNKNOWN;
JFIFMarkerSegment jfif = null;
AdobeMarkerSegment adobe = null;
SOFMarkerSegment sof = null;
if (metadata != null) {
jfif = (JFIFMarkerSegment) metadata.findMarkerSegment
(JFIFMarkerSegment.class, true);
adobe = (AdobeMarkerSegment) metadata.findMarkerSegment
(AdobeMarkerSegment.class, true);
sof = (SOFMarkerSegment) metadata.findMarkerSegment
(SOFMarkerSegment.class, true);
}
iccProfile = null; // By default don't write one
convertTosRGB = false; // PhotoYCC does this
converted = null;
if (destType != null) {
if (numBandsUsed != destType.getNumBands()) {
throw new IIOException
("Number of source bands != number of destination bands");
}
cs = destType.getColorModel().getColorSpace();
// Check the metadata against the destination type
if (metadata != null) {
checkSOFBands(sof, numBandsUsed);
checkJFIF(jfif, destType, false);
// Do we want to write an ICC profile?
if ((jfif != null) && (ignoreJFIF == false)) {
if (ImageUtil.isNonStandardICCColorSpace(cs)) {
iccProfile = ((ICC_ColorSpace) cs).getProfile();
}
}
checkAdobe(adobe, destType, false);
} else { // no metadata, but there is a dest type
// If we can add a JFIF or an Adobe marker segment, do so
if (JPEG.isJFIFcompliant(destType, false)) {
writeDefaultJFIF = true;
// Do we want to write an ICC profile?
if (ImageUtil.isNonStandardICCColorSpace(cs)) {
iccProfile = ((ICC_ColorSpace) cs).getProfile();
}
} else {
int transform = JPEG.transformForType(destType, false);
if (transform != JPEG.ADOBE_IMPOSSIBLE) {
writeAdobe = true;
newAdobeTransform = transform;
}
}
// re-create the metadata
metadata = new JPEGMetadata(destType, null, this);
}
inCsType = getSrcCSType(destType);
outCsType = getDefaultDestCSType(destType);
} else { // no destination type
if (metadata == null) {
if (fullImage) { // no dest, no metadata, full image
// Use default metadata matching the image and param
metadata = new JPEGMetadata(new ImageTypeSpecifier(rimage),
param, this);
if (metadata.findMarkerSegment
(JFIFMarkerSegment.class, true) != null) {
cs = rimage.getColorModel().getColorSpace();
if (ImageUtil.isNonStandardICCColorSpace(cs)) {
iccProfile = ((ICC_ColorSpace) cs).getProfile();
}
}
inCsType = getSrcCSType(rimage);
outCsType = getDefaultDestCSType(rimage);
}
// else no dest, no metadata, not an image,
// so no special headers, no color conversion
} else { // no dest type, but there is metadata
checkSOFBands(sof, numBandsUsed);
if (fullImage) { // no dest, metadata, image
// Check that the metadata and the image match
ImageTypeSpecifier inputType =
new ImageTypeSpecifier(rimage);
inCsType = getSrcCSType(rimage);
if (cm != null) {
boolean alpha = cm.hasAlpha();
switch (cs.getType()) {
case ColorSpace.TYPE_GRAY:
if (!alpha) {
outCsType = JPEG.JCS_GRAYSCALE;
} else {
if (jfif != null) {
ignoreJFIF = true;
warningOccurred
(WARNING_IMAGE_METADATA_JFIF_MISMATCH);
}
// out colorspace remains unknown
}
if ((adobe != null)
&& (adobe.transform != JPEG.ADOBE_UNKNOWN)) {
newAdobeTransform = JPEG.ADOBE_UNKNOWN;
warningOccurred
(WARNING_IMAGE_METADATA_ADOBE_MISMATCH);
}
break;
case ColorSpace.TYPE_RGB:
if (jfif != null) {
outCsType = JPEG.JCS_YCbCr;
if (ImageUtil.isNonStandardICCColorSpace(cs)
|| ((cs instanceof ICC_ColorSpace)
&& (jfif.iccSegment != null))) {
iccProfile =
((ICC_ColorSpace) cs).getProfile();
}
} else if (adobe != null) {
switch (adobe.transform) {
case JPEG.ADOBE_UNKNOWN:
outCsType = JPEG.JCS_RGB;
break;
case JPEG.ADOBE_YCC:
outCsType = JPEG.JCS_YCbCr;
break;
default:
warningOccurred
(WARNING_IMAGE_METADATA_ADOBE_MISMATCH);
newAdobeTransform = JPEG.ADOBE_UNKNOWN;
outCsType = JPEG.JCS_RGB;
break;
}
} else {
// consult the ids
int outCS = sof.getIDencodedCSType();
// if they don't resolve it,
// consult the sampling factors
if (outCS != JPEG.JCS_UNKNOWN) {
outCsType = outCS;
} else {
boolean subsampled =
isSubsampled(sof.componentSpecs);
if (subsampled) {
outCsType = JPEG.JCS_YCbCr;
} else {
outCsType = JPEG.JCS_RGB;
}
}
}
break;
}
}
} // else no dest, metadata, not an image. Defaults ok
}
}
boolean metadataProgressive = false;
int [] scans = null;
if (metadata != null) {
if (sof == null) {
sof = (SOFMarkerSegment) metadata.findMarkerSegment
(SOFMarkerSegment.class, true);
}
if ((sof != null) && (sof.tag == JPEG.SOF2)) {
metadataProgressive = true;
if (progressiveMode == ImageWriteParam.MODE_COPY_FROM_METADATA) {
scans = collectScans(metadata, sof); // Might still be null
} else {
numScans = 0;
}
}
if (jfif == null) {
jfif = (JFIFMarkerSegment) metadata.findMarkerSegment
(JFIFMarkerSegment.class, true);
}
}
thumbnails = image.getThumbnails();
int numThumbs = image.getNumThumbnails();
forceJFIF = false;
// determine if thumbnails can be written
// If we are going to add a default JFIF marker segment,
// then thumbnails can be written
if (!writeDefaultJFIF) {
// If there is no metadata, then we can't write thumbnails
if (metadata == null) {
thumbnails = null;
if (numThumbs != 0) {
warningOccurred(WARNING_IGNORING_THUMBS);
}
} else {
// There is metadata
// If we are writing a raster or subbands,
// then the user must specify JFIF on the metadata
if (fullImage == false) {
if (jfif == null) {
thumbnails = null; // Or we can't include thumbnails
if (numThumbs != 0) {
warningOccurred(WARNING_IGNORING_THUMBS);
}
}
} else { // It is a full image, and there is metadata
if (jfif == null) { // Not JFIF
// Can it have JFIF?
if ((outCsType == JPEG.JCS_GRAYSCALE)
|| (outCsType == JPEG.JCS_YCbCr)) {
if (numThumbs != 0) {
forceJFIF = true;
warningOccurred(WARNING_FORCING_JFIF);
}
} else { // Nope, not JFIF-compatible
thumbnails = null;
if (numThumbs != 0) {
warningOccurred(WARNING_IGNORING_THUMBS);
}
}
}
}
}
}
// Set up a boolean to indicate whether we need to call back to
// write metadata
boolean haveMetadata =
((metadata != null) || writeDefaultJFIF || writeAdobe);
// Now that we have dealt with metadata, finalize our tables set up
// Are we going to write tables? By default, yes.
boolean writeDQT = true;
boolean writeDHT = true;
// But if the metadata has no tables, no.
DQTMarkerSegment dqt = null;
DHTMarkerSegment dht = null;
int restartInterval = 0;
if (metadata != null) {
dqt = (DQTMarkerSegment) metadata.findMarkerSegment
(DQTMarkerSegment.class, true);
dht = (DHTMarkerSegment) metadata.findMarkerSegment
(DHTMarkerSegment.class, true);
DRIMarkerSegment dri =
(DRIMarkerSegment) metadata.findMarkerSegment
(DRIMarkerSegment.class, true);
if (dri != null) {
restartInterval = dri.restartInterval;
}
if (dqt == null) {
writeDQT = false;
}
if (dht == null) {
writeDHT = false; // Ignored if optimizeHuffman is true
}
}
// Whether we write tables or not, we need to figure out which ones
// to use
if (qTables == null) { // Get them from metadata, or use defaults
if (dqt != null) {
qTables = collectQTablesFromMetadata(metadata);
} else if (streamQTables != null) {
qTables = streamQTables;
} else if ((jparam != null) && (jparam.areTablesSet())) {
qTables = jparam.getQTables();
} else {
qTables = JPEG.getDefaultQTables();
}
}
// If we are optimizing, we don't want any tables.
if (optimizeHuffman == false) {
// If they were for progressive scans, we can't use them.
if ((dht != null) && (metadataProgressive == false)) {
DCHuffmanTables = collectHTablesFromMetadata(metadata, true);
ACHuffmanTables = collectHTablesFromMetadata(metadata, false);
} else if (streamDCHuffmanTables != null) {
DCHuffmanTables = streamDCHuffmanTables;
ACHuffmanTables = streamACHuffmanTables;
} else if ((jparam != null) && (jparam.areTablesSet())) {
DCHuffmanTables = jparam.getDCHuffmanTables();
ACHuffmanTables = jparam.getACHuffmanTables();
} else {
DCHuffmanTables = JPEG.getDefaultHuffmanTables(true);
ACHuffmanTables = JPEG.getDefaultHuffmanTables(false);
}
}
// By default, ids are 1 - N, no subsampling
int [] componentIds = new int[numBandsUsed];
int [] HsamplingFactors = new int[numBandsUsed];
int [] VsamplingFactors = new int[numBandsUsed];
int [] QtableSelectors = new int[numBandsUsed];
for (int i = 0; i < numBandsUsed; i++) {
componentIds[i] = i+1; // JFIF compatible
HsamplingFactors[i] = 1;
VsamplingFactors[i] = 1;
QtableSelectors[i] = 0;
}
// Now override them with the contents of sof, if there is one,
if (sof != null) {
for (int i = 0; i < numBandsUsed; i++) {
if (forceJFIF == false) { // else use JFIF-compatible default
componentIds[i] = sof.componentSpecs[i].componentId;
}
HsamplingFactors[i] = sof.componentSpecs[i].HsamplingFactor;
VsamplingFactors[i] = sof.componentSpecs[i].VsamplingFactor;
QtableSelectors[i] = sof.componentSpecs[i].QtableSelector;
}
}
sourceXOffset += gridX;
sourceWidth -= gridX;
sourceYOffset += gridY;
sourceHeight -= gridY;
int destWidth = (sourceWidth + periodX - 1)/periodX;
int destHeight = (sourceHeight + periodY - 1)/periodY;
// Create an appropriate 1-line databuffer for writing
int lineSize = sourceWidth*numBandsUsed;
DataBufferByte buffer = new DataBufferByte(lineSize);
// Create a raster from that
int [] bandOffs = JPEG.bandOffsets[numBandsUsed-1];
raster = Raster.createInterleavedRaster(buffer,
sourceWidth, 1,
lineSize,
numBandsUsed,
bandOffs,
null);
// Call the writer, who will call back for every scanline