filter/jpeg/jpeg.cxx

/**************************************************************
 *
 * 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_svtools.hxx"

#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 <svtools/FilterConfigItem.hxx>
#include <svtools/filter.hxx>

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

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

#define JPEGMINREAD 512

namespace {
    // Arbitrary maximal size (256M) of bitmaps after they have been decoded.
    // It is used to prevent excessive swapping due to large buffers in
    // virtual memory.
    // May have to be tuned if it turns out to be too large or too small.
    static const sal_uInt64 MAX_BITMAP_BYTE_SIZE = sal_uInt64(256 * 1024 * 1024);
}

// -------------
// - (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;

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

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

                if( pSvStm->GetError() == ERRCODE_IO_PENDING )
                {
                        nRead = 0;

                        // 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 );
                }
        }
        else
                nRead = 0;

        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 <= 0) {
    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 = String::CreateFromAscii( "SVIJPEG", 7 );
    nFormerPos = nLastPos;
}

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

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

    if( pAcc )
        aBmp.ReleaseAccess( pAcc );

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

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

void* JPEGReader::CreateBitmap( void* pParam )
{
    Size        aSize( ((JPEGCreateBitmapParam*)pParam)->nWidth,
                        ((JPEGCreateBitmapParam*)pParam)->nHeight );
    sal_Bool    bGray = ((JPEGCreateBitmapParam*)pParam)->bGray != 0;

    void* pBmpBuf = NULL;

    if( pAcc )
    {
        aBmp.ReleaseAccess( pAcc );
        aBmp = Bitmap();
        pAcc = NULL;
    }

    // Check if the bitmap is untypically large.
    if (aSize.Width()<=0
        || aSize.Height()<=0
        || sal_uInt64(aSize.Width())*sal_uInt64(aSize.Height())*(bGray?1:3) > MAX_BITMAP_BYTE_SIZE)
    {
        // Do not try to acquire resources for the large bitmap or to
        // read the bitmap into memory.
        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 ) ) &&
            ( (JPEGCreateBitmapParam*) pParam )->X_density &&
            ( (JPEGCreateBitmapParam*) pParam )->Y_density )
        {
            Point       aEmptyPoint;
            Fraction    aFractX( 1, ((JPEGCreateBitmapParam*)pParam)->X_density );
            Fraction    aFractY( 1, ((JPEGCreateBitmapParam*)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 )
    {
        long nAlignedWidth;

        const sal_uLong nFormat = pAcc->GetScanlineFormat();

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

        // clean up, if no Bitmap buffer can be provided.
        if ( pBmpBuf == 0 )
        {
            aBmp.ReleaseAccess( pAcc );
            aBmp = Bitmap();
            pAcc = NULL;
        }

        ((JPEGCreateBitmapParam*)pParam)->nAlignedWidth = nAlignedWidth;
    }

    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++ )
            {
                // #122985# Added fast-lane implementations using CopyScanline with direct supported mem formats
                static bool bCheckOwnReader(true);

                if(bCheckOwnReader)
                {
                    // #122985# Trying to copy the RGB data from jpeg import to make things faster. Unfortunately
                    // it has no GBR format, so RGB three-byte groups need to be 'flipped' to GBR first,
                    // then CopyScanline can use a memcpy to do the data transport. CopyScanline can also
                    // do the needed conversion from BMP_FORMAT_24BIT_TC_RGB (and it works well), but this
                    // is not faster that the old loop below using SetPixel.
                    sal_uInt8* aSource((sal_uInt8*)pBuffer + nY * nAlignedWidth);
                    sal_uInt8* aEnd(aSource + (nWidth * 3));

                    for(sal_uInt8* aTmp(aSource); aTmp < aEnd; aTmp += 3)
                    {
                        ::std::swap(*aTmp, *(aTmp + 2));
                    }

                    pAcc->CopyScanline(nY, aSource, BMP_FORMAT_24BIT_TC_BGR, nWidth * 3);
                }
                else
                {
                    // old version: WritePixel
                    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.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM( "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( pAcc->GetPixelIndex( 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 explicitely 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( pAcc->GetPixelIndex( 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 );
}