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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 "JpegReader.hxx"
#include <vcl/bitmapaccess.hxx>
#include <vcl/FilterConfigItem.hxx>
#include <vcl/graphicfilter.hxx>
#include <tools/fract.hxx>
#include <memory>
#define JPEG_MIN_READ 512
#define BUFFER_SIZE 4096
namespace {
// Arbitrary maximal size (512M) of a bitmap after it has 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(512 * 1024 * 1024);
}
/* Expanded data source object for stdio input */
struct SourceManagerStruct {
jpeg_source_mgr pub; /* public fields */
SvStream* stream; /* source stream */
JOCTET* buffer; /* start of buffer */
boolean start_of_file; /* have we gotten any data yet? */
};
/*
* Initialize source --- called by jpeg_read_header
* before any data is actually read.
*/
extern "C" void init_source (j_decompress_ptr cinfo)
{
SourceManagerStruct * source = reinterpret_cast<SourceManagerStruct *>(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.
*/
source->start_of_file = TRUE;
}
long StreamRead( SvStream* pStream, void* pBuffer, long nBufferSize )
{
long nRead = 0;
if( pStream->GetError() != ERRCODE_IO_PENDING )
{
long nInitialPosition = pStream->Tell();
nRead = static_cast<long>(pStream->ReadBytes(pBuffer, nBufferSize));
if( pStream->GetError() == ERRCODE_IO_PENDING )
{
// in order to search from the old position
// we temporarily reset the error
pStream->ResetError();
pStream->Seek( nInitialPosition );
pStream->SetError( ERRCODE_IO_PENDING );
}
}
return nRead;
}
extern "C" boolean fill_input_buffer (j_decompress_ptr cinfo)
{
SourceManagerStruct * source = reinterpret_cast<SourceManagerStruct *>(cinfo->src);
size_t nbytes;
nbytes = StreamRead(source->stream, source->buffer, BUFFER_SIZE);
if (!nbytes)
{
if (source->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 */
source->buffer[0] = (JOCTET) 0xFF;
source->buffer[1] = (JOCTET) JPEG_EOI;
nbytes = 2;
}
source->pub.next_input_byte = source->buffer;
source->pub.bytes_in_buffer = nbytes;
source->start_of_file = FALSE;
return TRUE;
}
extern "C" void skip_input_data (j_decompress_ptr cinfo, long numberOfBytes)
{
SourceManagerStruct * source = reinterpret_cast<SourceManagerStruct *>(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 (numberOfBytes > 0)
{
while (numberOfBytes > (long) source->pub.bytes_in_buffer)
{
numberOfBytes -= (long) source->pub.bytes_in_buffer;
(void) fill_input_buffer(cinfo);
/* note we assume that fill_input_buffer will never return false,
* so suspension need not be handled.
*/
}
source->pub.next_input_byte += (size_t) numberOfBytes;
source->pub.bytes_in_buffer -= (size_t) numberOfBytes;
}
}
extern "C" void term_source (j_decompress_ptr)
{
/* no work necessary here */
}
void jpeg_svstream_src (j_decompress_ptr cinfo, void* input)
{
SourceManagerStruct * source;
SvStream* stream = static_cast<SvStream*>(input);
/* 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 == nullptr)
{ /* first time for this JPEG object? */
cinfo->src = static_cast<jpeg_source_mgr *>(
(*cinfo->mem->alloc_small) (reinterpret_cast<j_common_ptr>(cinfo), JPOOL_PERMANENT, sizeof(SourceManagerStruct)));
source = reinterpret_cast<SourceManagerStruct *>(cinfo->src);
source->buffer = static_cast<JOCTET *>(
(*cinfo->mem->alloc_small) (reinterpret_cast<j_common_ptr>(cinfo), JPOOL_PERMANENT, BUFFER_SIZE * sizeof(JOCTET)));
}
source = reinterpret_cast<SourceManagerStruct *>(cinfo->src);
source->pub.init_source = init_source;
source->pub.fill_input_buffer = fill_input_buffer;
source->pub.skip_input_data = skip_input_data;
source->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
source->pub.term_source = term_source;
source->stream = stream;
source->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
source->pub.next_input_byte = nullptr; /* until buffer loaded */
}
JPEGReader::JPEGReader( SvStream& rStream, void* /*pCallData*/, bool bSetLogSize ) :
mrStream ( rStream ),
mnLastPos ( rStream.Tell() ),
mnLastLines ( 0 ),
mbSetLogSize ( bSetLogSize )
{
maUpperName = "SVIJPEG";
mnFormerPos = mnLastPos;
}
JPEGReader::~JPEGReader()
{
}
bool JPEGReader::CreateBitmap(JPEGCreateBitmapParam& rParam)
{
if (rParam.nWidth > SAL_MAX_INT32 / 8 || rParam.nHeight > SAL_MAX_INT32 / 8)
return false; // avoid overflows later
if (rParam.nWidth == 0 || rParam.nHeight == 0)
return false;
Size aSize(rParam.nWidth, rParam.nHeight);
bool bGray = rParam.bGray;
maBitmap = Bitmap();
sal_uInt64 nSize = aSize.Width() * aSize.Height();
if (nSize > SAL_MAX_INT32 / (bGray?1:3))
return false;
// Check if the bitmap is atypically large.
if (nSize*(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 false;
}
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 );
}
maBitmap = Bitmap(aSize, 8, &aGrayPal);
}
else
{
maBitmap = Bitmap(aSize, 24);
}
if (mbSetLogSize)
{
unsigned long nUnit = rParam.density_unit;
if (((1 == nUnit) || (2 == nUnit)) && rParam.X_density && rParam.Y_density )
{
Point aEmptyPoint;
Fraction aFractX( 1, rParam.X_density );
Fraction aFractY( 1, rParam.Y_density );
MapMode aMapMode( nUnit == 1 ? MAP_INCH : MAP_CM, aEmptyPoint, aFractX, aFractY );
Size aPrefSize = OutputDevice::LogicToLogic( aSize, aMapMode, MAP_100TH_MM );
maBitmap.SetPrefSize(aPrefSize);
maBitmap.SetPrefMapMode(MapMode(MAP_100TH_MM));
}
}
return true;
}
Graphic JPEGReader::CreateIntermediateGraphic(long nLines)
{
Graphic aGraphic;
const Size aSizePixel(maBitmap.GetSizePixel());
if (!mnLastLines)
{
maIncompleteAlpha = Bitmap(aSizePixel, 1);
maIncompleteAlpha.Erase(Color(COL_WHITE));
}
if (nLines && (nLines < aSizePixel.Height()))
{
const long nNewLines = nLines - mnLastLines;
if (nNewLines > 0)
{
{
Bitmap::ScopedWriteAccess pAccess(maIncompleteAlpha);
pAccess->SetFillColor(Color(COL_BLACK));
pAccess->FillRect(Rectangle(Point(0, mnLastLines), Size(pAccess->Width(), nNewLines)));
}
aGraphic = BitmapEx(maBitmap, maIncompleteAlpha);
}
else
{
aGraphic = maBitmap;
}
}
else
{
aGraphic = maBitmap;
}
mnLastLines = nLines;
return aGraphic;
}
ReadState JPEGReader::Read( Graphic& rGraphic )
{
long nEndPosition;
long nLines;
ReadState eReadState;
bool bRet = false;
sal_uInt8 cDummy;
// TODO: is it possible to get rid of this seek to the end?
// check if the stream's end is already available
mrStream.Seek( STREAM_SEEK_TO_END );
mrStream.ReadUChar( cDummy );
nEndPosition = mrStream.Tell();
// else check if at least JPEG_MIN_READ bytes can be read
if( mrStream.GetError() == ERRCODE_IO_PENDING )
{
mrStream.ResetError();
if( ( nEndPosition - mnFormerPos ) < JPEG_MIN_READ )
{
mrStream.Seek( mnLastPos );
return JPEGREAD_NEED_MORE;
}
}
// seek back to the original position
mrStream.Seek( mnLastPos );
// read the (partial) image
ReadJPEG( this, &mrStream, &nLines, GetPreviewSize() );
if (!maBitmap.IsEmpty())
{
if( mrStream.GetError() == ERRCODE_IO_PENDING )
{
rGraphic = CreateIntermediateGraphic(nLines);
}
else
{
rGraphic = maBitmap;
}
bRet = true;
}
else if( mrStream.GetError() == ERRCODE_IO_PENDING )
{
bRet = true;
}
// Set status ( Pending has priority )
if( mrStream.GetError() == ERRCODE_IO_PENDING )
{
eReadState = JPEGREAD_NEED_MORE;
mrStream.ResetError();
mnFormerPos = mrStream.Tell();
}
else
{
eReadState = bRet ? JPEGREAD_OK : JPEGREAD_ERROR;
}
return eReadState;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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