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/* -*- 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 <sal/config.h>
#include "jpeg.h"
#include <jpeglib.h>
#include <jerror.h>
#include "JpegWriter.hxx"
#include <vcl/bitmapaccess.hxx>
#include <vcl/FilterConfigItem.hxx>
#include <vcl/graphicfilter.hxx>
#define BUFFER_SIZE 4096
struct DestinationManagerStruct
{
jpeg_destination_mgr pub; /* public fields */
SvStream* stream; /* target stream */
JOCTET * buffer; /* start of buffer */
};
extern "C" void init_destination (j_compress_ptr cinfo)
{
DestinationManagerStruct * destination = reinterpret_cast<DestinationManagerStruct *>(cinfo->dest);
/* Allocate the output buffer -- it will be released when done with image */
destination->buffer = static_cast<JOCTET *>(
(*cinfo->mem->alloc_small) (reinterpret_cast<j_common_ptr>(cinfo), JPOOL_IMAGE, BUFFER_SIZE * sizeof(JOCTET)));
destination->pub.next_output_byte = destination->buffer;
destination->pub.free_in_buffer = BUFFER_SIZE;
}
extern "C" boolean empty_output_buffer (j_compress_ptr cinfo)
{
DestinationManagerStruct * destination = reinterpret_cast<DestinationManagerStruct *>(cinfo->dest);
if (destination->stream->WriteBytes(destination->buffer, BUFFER_SIZE) != BUFFER_SIZE)
{
ERREXIT(cinfo, JERR_FILE_WRITE);
}
destination->pub.next_output_byte = destination->buffer;
destination->pub.free_in_buffer = BUFFER_SIZE;
return TRUE;
}
extern "C" void term_destination (j_compress_ptr cinfo)
{
DestinationManagerStruct * destination = reinterpret_cast<DestinationManagerStruct *>(cinfo->dest);
size_t datacount = BUFFER_SIZE - destination->pub.free_in_buffer;
/* Write any data remaining in the buffer */
if (datacount > 0)
{
if (destination->stream->WriteBytes(destination->buffer, datacount) != datacount)
{
ERREXIT(cinfo, JERR_FILE_WRITE);
}
}
}
void jpeg_svstream_dest (j_compress_ptr cinfo, void* output)
{
SvStream* stream = static_cast<SvStream*>(output);
DestinationManagerStruct * destination;
/* 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 == nullptr)
{ /* first time for this JPEG object? */
cinfo->dest = static_cast<jpeg_destination_mgr*>(
(*cinfo->mem->alloc_small) (reinterpret_cast<j_common_ptr>(cinfo), JPOOL_PERMANENT, sizeof(DestinationManagerStruct)));
}
destination = reinterpret_cast<DestinationManagerStruct *>(cinfo->dest);
destination->pub.init_destination = init_destination;
destination->pub.empty_output_buffer = empty_output_buffer;
destination->pub.term_destination = term_destination;
destination->stream = stream;
}
JPEGWriter::JPEGWriter( SvStream& rStream, const css::uno::Sequence< css::beans::PropertyValue >* pFilterData, bool* pExportWasGrey ) :
mrStream ( rStream ),
mpBuffer ( nullptr ),
mbNative ( false ),
mpExpWasGrey ( pExportWasGrey )
{
FilterConfigItem aConfigItem( pFilterData );
mbGreys = aConfigItem.ReadInt32( "ColorMode", 0 ) != 0;
mnQuality = aConfigItem.ReadInt32( "Quality", 75 );
maChromaSubsampling = aConfigItem.ReadInt32( "ChromaSubsamplingMode", 0 );
if ( pFilterData )
{
int nArgs = pFilterData->getLength();
const css::beans::PropertyValue* pValues = pFilterData->getConstArray();
while( nArgs-- )
{
if ( pValues->Name == "StatusIndicator" )
{
pValues->Value >>= mxStatusIndicator;
}
pValues++;
}
}
}
void* JPEGWriter::GetScanline( long nY )
{
void* pScanline = nullptr;
if( mpReadAccess )
{
if( mbNative )
{
pScanline = mpReadAccess->GetScanline( nY );
}
else if( mpBuffer )
{
BitmapColor aColor;
long nWidth = mpReadAccess->Width();
sal_uInt8* pTmp = mpBuffer;
if( mpReadAccess->HasPalette() )
{
for( long nX = 0L; nX < nWidth; nX++ )
{
aColor = mpReadAccess->GetPaletteColor( mpReadAccess->GetPixelIndex( nY, nX ) );
*pTmp++ = aColor.GetRed();
if ( !mbGreys )
{
*pTmp++ = aColor.GetGreen();
*pTmp++ = aColor.GetBlue();
}
}
}
else
{
for( long nX = 0L; nX < nWidth; nX++ )
{
aColor = mpReadAccess->GetPixel( nY, nX );
*pTmp++ = aColor.GetRed();
if ( !mbGreys )
{
*pTmp++ = aColor.GetGreen();
*pTmp++ = aColor.GetBlue();
}
}
}
pScanline = mpBuffer;
}
}
return pScanline;
}
bool JPEGWriter::Write( const Graphic& rGraphic )
{
bool bRet = false;
if ( mxStatusIndicator.is() )
{
mxStatusIndicator->start( OUString(), 100 );
}
Bitmap aGraphicBmp( rGraphic.GetBitmap() );
if ( mbGreys )
{
if ( !aGraphicBmp.Convert( BmpConversion::N8BitGreys ) )
aGraphicBmp = rGraphic.GetBitmap();
}
mpReadAccess = Bitmap::ScopedReadAccess(aGraphicBmp);
if( mpReadAccess )
{
if ( !mbGreys ) // bitmap was not explicitly converted into greyscale,
{ // check if source is greyscale only
bool bIsGrey = true;
long nWidth = mpReadAccess->Width();
for ( long nY = 0; bIsGrey && ( nY < mpReadAccess->Height() ); nY++ )
{
BitmapColor aColor;
for( long nX = 0L; bIsGrey && ( nX < nWidth ); nX++ )
{
aColor = mpReadAccess->HasPalette() ? mpReadAccess->GetPaletteColor( mpReadAccess->GetPixelIndex( nY, nX ) )
: mpReadAccess->GetPixel( nY, nX );
bIsGrey = ( aColor.GetRed() == aColor.GetGreen() ) && ( aColor.GetRed() == aColor.GetBlue() );
}
}
if ( bIsGrey )
mbGreys = true;
}
if( mpExpWasGrey )
*mpExpWasGrey = mbGreys;
mbNative = ( mpReadAccess->GetScanlineFormat() == ScanlineFormat::N24BitTcRgb );
if( !mbNative )
mpBuffer = new sal_uInt8[ AlignedWidth4Bytes( mbGreys ? mpReadAccess->Width() * 8L : mpReadAccess->Width() * 24L ) ];
SAL_INFO("vcl", "\nJPEG Export - DPI X: " << rGraphic.GetPPI().getX() << "\nJPEG Export - DPI Y: " << rGraphic.GetPPI().getY());
bRet = WriteJPEG( this, &mrStream, mpReadAccess->Width(),
mpReadAccess->Height(), rGraphic.GetPPI(), mbGreys,
mnQuality, maChromaSubsampling, mxStatusIndicator );
delete[] mpBuffer;
mpBuffer = nullptr;
mpReadAccess.reset();
}
if ( mxStatusIndicator.is() )
mxStatusIndicator->end();
return bRet;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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