summaryrefslogtreecommitdiff
path: root/vcl/source/filter/jpeg/jpeg.cxx
blob: 72c6e5746248a45dbbc65f4db6809e26686b7781 (plain)
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
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */


#include <tools/solar.h>

extern "C"
{
    #include "stdio.h"
    #include "jpeg.h"
    #include <jpeglib.h>
    #include <jerror.h>
}

#define _JPEGPRIVATE
#include <vcl/bmpacc.hxx>
#include "jpeg.hxx"
#include <vcl/FilterConfigItem.hxx>
#include <vcl/graphicfilter.hxx>

// -----------
// - Defines -
// -----------

using namespace ::com::sun::star;

#define JPEGMINREAD 512

// -------------
// - (C-Calls) -
// -------------

// ------------------------------------------------------------------------

extern "C" void* CreateBitmap( void* pJPEGReader, void* pJPEGCreateBitmapParam )
{
    return ( (JPEGReader*) pJPEGReader )->CreateBitmap( pJPEGCreateBitmapParam );
}

// ------------------------------------------------------------------------

extern "C" void* GetScanline( void* pJPEGWriter, long nY )
{
    return ( (JPEGWriter*) pJPEGWriter )->GetScanline( nY );
}

// ------------------------------------------------------------------------

struct JPEGCallbackStruct
{
    uno::Reference< task::XStatusIndicator > xStatusIndicator;
};

extern "C" long JPEGCallback( void* pCallbackData, long nPercent )
{
    JPEGCallbackStruct* pS = (JPEGCallbackStruct*)pCallbackData;
    if ( pS && pS->xStatusIndicator.is() )
    {
        pS->xStatusIndicator->setValue( nPercent );
    }
    return 0L;
}

#define BUF_SIZE  4096

typedef struct
{
  struct jpeg_destination_mgr pub;  /* public fields */

  SvStream* outfile;                /* target stream */
  JOCTET * buffer;                  /* start of buffer */
} my_destination_mgr;

typedef my_destination_mgr * my_dest_ptr;

extern "C" void init_destination (j_compress_ptr cinfo)
{
  my_dest_ptr dest = (my_dest_ptr) cinfo->dest;

  /* Allocate the output buffer --- it will be released when done with image */
  dest->buffer = (JOCTET *)
      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
                                  BUF_SIZE * sizeof(JOCTET));

  dest->pub.next_output_byte = dest->buffer;
  dest->pub.free_in_buffer = BUF_SIZE;
}

extern "C" boolean empty_output_buffer (j_compress_ptr cinfo)
{
  my_dest_ptr dest = (my_dest_ptr) cinfo->dest;

  if (dest->outfile->Write(dest->buffer, BUF_SIZE) !=
      (size_t) BUF_SIZE)
    ERREXIT(cinfo, JERR_FILE_WRITE);

  dest->pub.next_output_byte = dest->buffer;
  dest->pub.free_in_buffer = BUF_SIZE;

  return sal_True;
}

extern "C" void term_destination (j_compress_ptr cinfo)
{
  my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
  size_t datacount = BUF_SIZE - dest->pub.free_in_buffer;

  /* Write any data remaining in the buffer */
  if (datacount > 0) {
    if (dest->outfile->Write(dest->buffer, datacount) != datacount)
      ERREXIT(cinfo, JERR_FILE_WRITE);
  }
}

extern "C" void jpeg_svstream_dest (j_compress_ptr cinfo, void* out)
{
  SvStream * outfile = (SvStream*)out;
  my_dest_ptr dest;

  /* The destination object is made permanent so that multiple JPEG images
   * can be written to the same file without re-executing jpeg_svstream_dest.
   * This makes it dangerous to use this manager and a different destination
   * manager serially with the same JPEG object, because their private object
   * sizes may be different.  Caveat programmer.
   */
  if (cinfo->dest == NULL) {    /* first time for this JPEG object? */
    cinfo->dest = (struct jpeg_destination_mgr *)
      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
                                  sizeof(my_destination_mgr));
  }

  dest = (my_dest_ptr) cinfo->dest;
  dest->pub.init_destination = init_destination;
  dest->pub.empty_output_buffer = empty_output_buffer;
  dest->pub.term_destination = term_destination;
  dest->outfile = outfile;
}

/* Expanded data source object for stdio input */

typedef struct {
  struct jpeg_source_mgr pub;   /* public fields */

  SvStream * infile;            /* source stream */
  JOCTET * buffer;              /* start of buffer */
  boolean start_of_file;        /* have we gotten any data yet? */
} my_source_mgr;

typedef my_source_mgr * my_src_ptr;

/*
 * Initialize source --- called by jpeg_read_header
 * before any data is actually read.
 */

extern "C" void init_source (j_decompress_ptr cinfo)
{
  my_src_ptr src = (my_src_ptr) cinfo->src;

  /* We reset the empty-input-file flag for each image,
   * but we don't clear the input buffer.
   * This is correct behavior for reading a series of images from one source.
   */
  src->start_of_file = sal_True;
}

long StreamRead( SvStream* pSvStm, void* pBuffer, long nBufferSize )
{
        long            nRead = 0;

        if( pSvStm->GetError() != ERRCODE_IO_PENDING )
        {
                long nActPos = pSvStm->Tell();

                nRead = (long) pSvStm->Read( pBuffer, nBufferSize );

                if( pSvStm->GetError() == ERRCODE_IO_PENDING )
                {
                        // Damit wir wieder an die alte Position
                        // seeken koennen, setzen wir den Error temp.zurueck
                        pSvStm->ResetError();
                        pSvStm->Seek( nActPos );
                        pSvStm->SetError( ERRCODE_IO_PENDING );
                }
        }

        return nRead;
}

extern "C" boolean fill_input_buffer (j_decompress_ptr cinfo)
{
  my_src_ptr src = (my_src_ptr) cinfo->src;
  size_t nbytes;

  nbytes = StreamRead(src->infile, src->buffer, BUF_SIZE);

  if (!nbytes) {
    if (src->start_of_file)     /* Treat empty input file as fatal error */
      ERREXIT(cinfo, JERR_INPUT_EMPTY);
    WARNMS(cinfo, JWRN_JPEG_EOF);
    /* Insert a fake EOI marker */
    src->buffer[0] = (JOCTET) 0xFF;
    src->buffer[1] = (JOCTET) JPEG_EOI;
    nbytes = 2;
  }

  src->pub.next_input_byte = src->buffer;
  src->pub.bytes_in_buffer = nbytes;
  src->start_of_file = sal_False;

  return sal_True;
}

extern "C" void skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
  my_src_ptr src = (my_src_ptr) cinfo->src;

  /* Just a dumb implementation for now.  Could use fseek() except
   * it doesn't work on pipes.  Not clear that being smart is worth
   * any trouble anyway --- large skips are infrequent.
   */
  if (num_bytes > 0) {
    while (num_bytes > (long) src->pub.bytes_in_buffer) {
      num_bytes -= (long) src->pub.bytes_in_buffer;
      (void) fill_input_buffer(cinfo);
      /* note we assume that fill_input_buffer will never return sal_False,
       * so suspension need not be handled.
       */
    }
    src->pub.next_input_byte += (size_t) num_bytes;
    src->pub.bytes_in_buffer -= (size_t) num_bytes;
  }
}

extern "C" void term_source (j_decompress_ptr)
{
  /* no work necessary here */
}

extern "C" void jpeg_svstream_src (j_decompress_ptr cinfo, void * in)
{
  my_src_ptr src;
  SvStream * infile = (SvStream*)in;

  /* The source object and input buffer are made permanent so that a series
   * of JPEG images can be read from the same file by calling jpeg_stdio_src
   * only before the first one.  (If we discarded the buffer at the end of
   * one image, we'd likely lose the start of the next one.)
   * This makes it unsafe to use this manager and a different source
   * manager serially with the same JPEG object.  Caveat programmer.
   */
  if (cinfo->src == NULL) {     /* first time for this JPEG object? */
    cinfo->src = (struct jpeg_source_mgr *)
      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
                                  sizeof(my_source_mgr));
    src = (my_src_ptr) cinfo->src;
    src->buffer = (JOCTET *)
      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
                                  BUF_SIZE * sizeof(JOCTET));
  }

  src = (my_src_ptr) cinfo->src;
  src->pub.init_source = init_source;
  src->pub.fill_input_buffer = fill_input_buffer;
  src->pub.skip_input_data = skip_input_data;
  src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
  src->pub.term_source = term_source;
  src->infile = infile;
  src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
  src->pub.next_input_byte = NULL; /* until buffer loaded */
}

// --------------
// - JPEGReader -
// --------------

JPEGReader::JPEGReader( SvStream& rStm, void* /*pCallData*/, sal_Bool bSetLS ) :
        rIStm           ( rStm ),
        pAcc            ( NULL ),
        pAcc1           ( NULL ),
        pBuffer         ( NULL ),
        nLastPos        ( rStm.Tell() ),
        nLastLines      ( 0 ),
        bSetLogSize     ( bSetLS )
{
    maUpperName = rtl::OUString("SVIJPEG");
    nFormerPos = nLastPos;
}

// ------------------------------------------------------------------------

JPEGReader::~JPEGReader()
{
    if( pBuffer )
        rtl_freeMemory( pBuffer );

    if( pAcc )
        aBmp.ReleaseAccess( pAcc );

    if( pAcc1 )
        aBmp1.ReleaseAccess( pAcc1 );
}

// ------------------------------------------------------------------------

void* JPEGReader::CreateBitmap( void* _pParam )
{
    JPEGCreateBitmapParam *pParam = (JPEGCreateBitmapParam *) _pParam;

    if (pParam->nWidth > SAL_MAX_INT32/8 || pParam->nHeight > SAL_MAX_INT32/8)
        return NULL; // avoid overflows later

    Size        aSize( pParam->nWidth, pParam->nHeight );
    sal_Bool    bGray = pParam->bGray != 0;

    void* pBmpBuf = NULL;

    if( pAcc )
        aBmp.ReleaseAccess( pAcc );

    sal_uInt64 nSize = aSize.Width();
    nSize *= aSize.Height();
    if (nSize > SAL_MAX_INT32 / 24)
        return NULL;

    if( bGray )
    {
        BitmapPalette aGrayPal( 256 );

        for( sal_uInt16 n = 0; n < 256; n++ )
        {
            const sal_uInt8 cGray = (sal_uInt8) n;
            aGrayPal[ n ] = BitmapColor( cGray, cGray, cGray );
        }

        aBmp = Bitmap( aSize, 8, &aGrayPal );
    }
    else
        aBmp = Bitmap( aSize, 24 );

    if ( bSetLogSize )
    {
        unsigned long nUnit = ((JPEGCreateBitmapParam*)pParam)->density_unit;

        if( ( ( 1 == nUnit ) || ( 2 == nUnit ) ) &&
            pParam->X_density && pParam->Y_density )
        {
            Point       aEmptyPoint;
            Fraction    aFractX( 1, pParam->X_density );
            Fraction    aFractY( 1, pParam->Y_density );
            MapMode     aMapMode( nUnit == 1 ? MAP_INCH : MAP_CM, aEmptyPoint, aFractX, aFractY );
            Size        aPrefSize = OutputDevice::LogicToLogic( aSize, aMapMode, MAP_100TH_MM );

            aBmp.SetPrefSize( aPrefSize );
            aBmp.SetPrefMapMode( MapMode( MAP_100TH_MM ) );
        }
    }

    pAcc = aBmp.AcquireWriteAccess();

    if( pAcc )
    {
        const sal_uLong nFormat = pAcc->GetScanlineFormat();

        if(
            ( bGray && ( BMP_FORMAT_8BIT_PAL == nFormat ) ) ||
            ( !bGray && ( BMP_FORMAT_24BIT_TC_RGB == nFormat ) )
          )
        {
            pBmpBuf = pAcc->GetBuffer();
            pParam->nAlignedWidth = pAcc->GetScanlineSize();
            pParam->bTopDown = pAcc->IsTopDown();
        }
        else
        {
            pParam->nAlignedWidth = AlignedWidth4Bytes( aSize.Width() * ( bGray ? 8 : 24 ) );
            pParam->bTopDown = sal_True;
            pBmpBuf = pBuffer = rtl_allocateMemory( pParam->nAlignedWidth * aSize.Height() );
        }
    }

    // clean up, if no Bitmap buffer can be provided.
    if ( !pBmpBuf )
    {
        aBmp.ReleaseAccess( pAcc );
        pAcc = NULL;
    }

    return pBmpBuf;
}

// ------------------------------------------------------------------------

void JPEGReader::FillBitmap()
{
    if( pBuffer && pAcc )
    {
        HPBYTE      pTmp;
        BitmapColor aColor;
        long        nAlignedWidth;
        long        nWidth = pAcc->Width();
        long        nHeight = pAcc->Height();

        if( pAcc->GetBitCount() == 8 )
        {
            BitmapColor* pCols = new BitmapColor[ 256 ];

            for( sal_uInt16 n = 0; n < 256; n++ )
            {
                const sal_uInt8 cGray = (sal_uInt8) n;
                pCols[ n ] = pAcc->GetBestMatchingColor( BitmapColor( cGray, cGray, cGray ) );
            }

            nAlignedWidth = AlignedWidth4Bytes( pAcc->Width() * 8L );

            for( long nY = 0L; nY < nHeight; nY++ )
            {
                pTmp = (sal_uInt8*) pBuffer + nY * nAlignedWidth;

                for( long nX = 0L; nX < nWidth; nX++ )
                    pAcc->SetPixel( nY, nX, pCols[ *pTmp++ ] );
            }

            delete[] pCols;
        }
        else
        {
            nAlignedWidth = AlignedWidth4Bytes( pAcc->Width() * 24L );

            for( long nY = 0L; nY < nHeight; nY++ )
            {
                pTmp = (sal_uInt8*) pBuffer + nY * nAlignedWidth;

                for( long nX = 0L; nX < nWidth; nX++ )
                {
                    aColor.SetRed( *pTmp++ );
                    aColor.SetGreen( *pTmp++ );
                    aColor.SetBlue( *pTmp++ );
                    pAcc->SetPixel( nY, nX, aColor );
                }
            }
        }
    }
}

// ------------------------------------------------------------------------

Graphic JPEGReader::CreateIntermediateGraphic( const Bitmap& rBitmap, long nLines )
{
    Graphic     aGraphic;
    const Size  aSizePix( rBitmap.GetSizePixel() );

    if( !nLastLines )
    {
        if( pAcc1 )
            aBmp1.ReleaseAccess( pAcc1 );

        aBmp1 = Bitmap( rBitmap.GetSizePixel(), 1 );
        aBmp1.Erase( Color( COL_WHITE ) );
        pAcc1 = aBmp1.AcquireWriteAccess();
    }

    if( nLines && ( nLines < aSizePix.Height() ) )
    {
        if( pAcc1 )
        {
            const long nNewLines = nLines - nLastLines;

            if( nNewLines )
            {
                pAcc1->SetFillColor( Color( COL_BLACK ) );
                pAcc1->FillRect( Rectangle( Point( 0, nLastLines ),
                                            Size( pAcc1->Width(), nNewLines ) ) );
            }

            aBmp1.ReleaseAccess( pAcc1 );
            aGraphic = BitmapEx( rBitmap, aBmp1 );
            pAcc1 = aBmp1.AcquireWriteAccess();
        }
        else
            aGraphic = rBitmap;
    }
    else
        aGraphic = rBitmap;

    nLastLines = nLines;

    return aGraphic;
}

// ------------------------------------------------------------------------

ReadState JPEGReader::Read( Graphic& rGraphic )
{
    long        nEndPos;
    long        nLines;
    ReadState   eReadState;
    sal_Bool        bRet = sal_False;
    sal_uInt8       cDummy;

#if 1 // TODO: is it possible to get rid of this seek to the end?
    // check if the stream's end is already available
    rIStm.Seek( STREAM_SEEK_TO_END );
    rIStm >> cDummy;
    nEndPos = rIStm.Tell();

    // else check if at least JPEGMINREAD bytes can be read
    if( rIStm.GetError() == ERRCODE_IO_PENDING )
    {
        rIStm.ResetError();
        if( ( nEndPos  - nFormerPos ) < JPEGMINREAD )
        {
            rIStm.Seek( nLastPos );
            return JPEGREAD_NEED_MORE;
        }
    }

    // seek back to the original position
    rIStm.Seek( nLastPos );
#endif

    Size aPreviewSize = GetPreviewSize();
    SetJpegPreviewSizeHint( aPreviewSize.Width(), aPreviewSize.Height() );

    // read the (partial) image
    ReadJPEG( this, &rIStm, &nLines );

    if( pAcc )
    {
        if( pBuffer )
        {
            FillBitmap();
            rtl_freeMemory( pBuffer );
            pBuffer = NULL;
        }

        aBmp.ReleaseAccess( pAcc );
        pAcc = NULL;

        if( rIStm.GetError() == ERRCODE_IO_PENDING )
            rGraphic = CreateIntermediateGraphic( aBmp, nLines );
        else
            rGraphic = aBmp;

        bRet = sal_True;
    }
    else if( rIStm.GetError() == ERRCODE_IO_PENDING )
        bRet = sal_True;

    // Status setzen ( Pending hat immer Vorrang )
    if( rIStm.GetError() == ERRCODE_IO_PENDING )
    {
        eReadState = JPEGREAD_NEED_MORE;
        rIStm.ResetError();
        nFormerPos = rIStm.Tell();
    }
    else
    {
        if( bRet )
            eReadState = JPEGREAD_OK;
        else
            eReadState = JPEGREAD_ERROR;
    }

    return eReadState;
}


// --------------
// - JPEGWriter -
// --------------

JPEGWriter::JPEGWriter( SvStream& rStm, const uno::Sequence< beans::PropertyValue >* pFilterData, bool* pExportWasGrey ) :
        rOStm       ( rStm ),
        pAcc        ( NULL ),
        pBuffer     ( NULL ),
        pExpWasGrey ( pExportWasGrey )
{
    FilterConfigItem aConfigItem( (uno::Sequence< beans::PropertyValue >*)pFilterData );
    bGreys = aConfigItem.ReadInt32( String( RTL_CONSTASCII_USTRINGPARAM( "ColorMode" ) ), 0 ) != 0;
    nQuality = aConfigItem.ReadInt32( String( RTL_CONSTASCII_USTRINGPARAM( "Quality" ) ), 75 );

    if ( pFilterData )
    {
        int nArgs = pFilterData->getLength();
        const beans::PropertyValue* pValues = pFilterData->getConstArray();
        while( nArgs-- )
        {
            if ( pValues->Name == "StatusIndicator" )
            {
                pValues->Value >>= xStatusIndicator;
            }
            pValues++;
        }
    }
}

// ------------------------------------------------------------------------

void* JPEGWriter::GetScanline( long nY )
{
    void* pScanline = NULL;

    if( pAcc )
    {
        if( bNative )
            pScanline = pAcc->GetScanline( nY );
        else if( pBuffer )
        {
            BitmapColor aColor;
            long        nWidth = pAcc->Width();
            sal_uInt8*      pTmp = pBuffer;

            if( pAcc->HasPalette() )
            {
                for( long nX = 0L; nX < nWidth; nX++ )
                {
                    aColor = pAcc->GetPaletteColor( (sal_uInt8) pAcc->GetPixel( nY, nX ) );
                    *pTmp++ = aColor.GetRed();
                    if ( bGreys )
                        continue;
                    *pTmp++ = aColor.GetGreen();
                    *pTmp++ = aColor.GetBlue();
                }
            }
            else
            {
                for( long nX = 0L; nX < nWidth; nX++ )
                {
                    aColor = pAcc->GetPixel( nY, nX );
                    *pTmp++ = aColor.GetRed();
                    if ( bGreys )
                        continue;
                    *pTmp++ = aColor.GetGreen();
                    *pTmp++ = aColor.GetBlue();
                }
            }

            pScanline = pBuffer;
        }
    }

    return pScanline;
}

// ------------------------------------------------------------------------

sal_Bool JPEGWriter::Write( const Graphic& rGraphic )
{
    sal_Bool bRet = sal_False;

    if ( xStatusIndicator.is() )
    {
        rtl::OUString aMsg;
        xStatusIndicator->start( aMsg, 100 );
    }

    Bitmap aGraphicBmp( rGraphic.GetBitmap() );

    if ( bGreys )
    {
        if ( !aGraphicBmp.Convert( BMP_CONVERSION_8BIT_GREYS ) )
            aGraphicBmp = rGraphic.GetBitmap();
    }

    pAcc = aGraphicBmp.AcquireReadAccess();

    if ( !bGreys )  // bitmap was not explicitly converted into greyscale,
    {               // check if source is greyscale only

        sal_Bool bIsGrey = sal_True;

        long nWidth = pAcc->Width();
        for ( long nY = 0; bIsGrey && ( nY < pAcc->Height() ); nY++ )
        {
            BitmapColor aColor;
            for( long nX = 0L; bIsGrey && ( nX < nWidth ); nX++ )
            {
                aColor = pAcc->HasPalette() ? pAcc->GetPaletteColor( (sal_uInt8) pAcc->GetPixel( nY, nX ) )
                                            : pAcc->GetPixel( nY, nX );
                bIsGrey = ( aColor.GetRed() == aColor.GetGreen() ) && ( aColor.GetRed() == aColor.GetBlue() );
            }
        }
        if ( bIsGrey )
            bGreys = sal_True;
    }

    if( pExpWasGrey )
        *pExpWasGrey = bGreys;

    if( pAcc )
    {
        bNative = ( pAcc->GetScanlineFormat() == BMP_FORMAT_24BIT_TC_RGB );

        if( !bNative )
            pBuffer = new sal_uInt8[ AlignedWidth4Bytes( bGreys ? pAcc->Width() * 8L : pAcc->Width() * 24L ) ];

        JPEGCallbackStruct aCallbackData;
        aCallbackData.xStatusIndicator = xStatusIndicator;
        bRet = (sal_Bool) WriteJPEG( this, &rOStm, pAcc->Width(), pAcc->Height(), bGreys, nQuality, &aCallbackData );

        delete[] pBuffer;
        pBuffer = NULL;

        aGraphicBmp.ReleaseAccess( pAcc );
        pAcc = NULL;
    }
    if ( xStatusIndicator.is() )
        xStatusIndicator->end();

    return bRet;
}

// --------------
// - ImportJPEG -
// --------------

sal_Bool ImportJPEG( SvStream& rStm, Graphic& rGraphic, void* pCallerData, sal_Int32 nImportFlags )
{
    JPEGReader* pJPEGReader = (JPEGReader*) rGraphic.GetContext();
    ReadState   eReadState;
    sal_Bool        bRet = sal_True;

    if( !pJPEGReader )
        pJPEGReader = new JPEGReader( rStm, pCallerData, ( nImportFlags & GRFILTER_I_FLAGS_SET_LOGSIZE_FOR_JPEG ) != 0 );

    if( nImportFlags & GRFILTER_I_FLAGS_FOR_PREVIEW )
        pJPEGReader->SetPreviewSize( Size(128,128) );
    else
        pJPEGReader->DisablePreviewMode();

    rGraphic.SetContext( NULL );
    eReadState = pJPEGReader->Read( rGraphic );

    if( eReadState == JPEGREAD_ERROR )
    {
        bRet = sal_False;
        delete pJPEGReader;
    }
    else if( eReadState == JPEGREAD_OK )
        delete pJPEGReader;
    else
        rGraphic.SetContext( pJPEGReader );

    return bRet;
}

//  --------------
//  - ExportJPEG -
//  --------------

sal_Bool ExportJPEG( SvStream& rOStm, const Graphic& rGraphic,
                 const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::PropertyValue >* pFilterData,
                 bool* pExportWasGrey
                )
{
    JPEGWriter aJPEGWriter( rOStm, pFilterData, pExportWasGrey );
    return aJPEGWriter.Write( rGraphic );
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */