mirror of
https://invent.kde.org/graphics/okular
synced 2024-11-05 18:34:53 +00:00
310 lines
8.4 KiB
C++
310 lines
8.4 KiB
C++
/***************************************************************************
|
|
* Copyright (C) 2008 by Tobias Koenig <tokoe@kde.org> *
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License as published by *
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
* (at your option) any later version. *
|
|
***************************************************************************/
|
|
|
|
#include "faxdocument.h"
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <QFile>
|
|
|
|
#include "faxexpand.h"
|
|
|
|
static const char FAXMAGIC[] = "\000PC Research, Inc\000\000\000\000\000\000";
|
|
|
|
#define FAX_DPI_FINE QPoint(203,196)
|
|
|
|
/* rearrange input bits into t16bits lsb-first chunks */
|
|
static void normalize( pagenode *pn, int revbits, int swapbytes, size_t length )
|
|
{
|
|
t32bits *p = (t32bits *) pn->data;
|
|
|
|
switch ( (revbits<<1) | swapbytes )
|
|
{
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
for ( ; length; length -= 4)
|
|
{
|
|
t32bits t = *p;
|
|
*p++ = ((t & 0xff00ff00) >> 8) | ((t & 0x00ff00ff) << 8);
|
|
}
|
|
break;
|
|
case 2:
|
|
for ( ; length; length -= 4)
|
|
{
|
|
t32bits t = *p;
|
|
t = ((t & 0xf0f0f0f0) >> 4) | ((t & 0x0f0f0f0f) << 4);
|
|
t = ((t & 0xcccccccc) >> 2) | ((t & 0x33333333) << 2);
|
|
*p++ = ((t & 0xaaaaaaaa) >> 1) | ((t & 0x55555555) << 1);
|
|
}
|
|
break;
|
|
case 3:
|
|
for ( ; length; length -= 4)
|
|
{
|
|
t32bits t = *p;
|
|
t = ((t & 0xff00ff00) >> 8) | ((t & 0x00ff00ff) << 8);
|
|
t = ((t & 0xf0f0f0f0) >> 4) | ((t & 0x0f0f0f0f) << 4);
|
|
t = ((t & 0xcccccccc) >> 2) | ((t & 0x33333333) << 2);
|
|
*p++ = ((t & 0xaaaaaaaa) >> 1) | ((t & 0x55555555) << 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool new_image( pagenode *pn, int width, int height )
|
|
{
|
|
pn->image = QImage( width, height, QImage::Format_MonoLSB );
|
|
pn->image.setColor( 0, qRgb( 255, 255, 255 ) );
|
|
pn->image.setColor( 1, qRgb( 0, 0, 0 ) );
|
|
pn->bytes_per_line = pn->image.bytesPerLine();
|
|
pn->dpi = FAX_DPI_FINE;
|
|
pn->imageData = new uchar[ width * height ];
|
|
|
|
return !pn->image.isNull();
|
|
}
|
|
|
|
/* get compressed data into memory */
|
|
static unsigned char* getstrip( pagenode *pn, int strip )
|
|
{
|
|
size_t offset, roundup;
|
|
unsigned char *data;
|
|
|
|
union { t16bits s; unsigned char b[2]; } so;
|
|
#define ShortOrder so.b[1]
|
|
so.s = 1; /* XXX */
|
|
|
|
QFile file( pn->filename );
|
|
if ( !file.open( QIODevice::ReadOnly ) )
|
|
return nullptr;
|
|
|
|
if ( pn->strips == nullptr )
|
|
{
|
|
offset = 0;
|
|
pn->length = file.size();
|
|
}
|
|
else if ( strip < pn->nstrips )
|
|
{
|
|
offset = pn->strips[ strip ].offset;
|
|
pn->length = pn->strips[ strip ].size;
|
|
}
|
|
else
|
|
return nullptr;
|
|
|
|
/* round size to full boundary plus t32bits */
|
|
roundup = (pn->length + 7) & ~3;
|
|
|
|
data = new uchar[ roundup ];
|
|
/* clear the last 2 t32bits, to force the expander to terminate
|
|
even if the file ends in the middle of a fax line */
|
|
*((t32bits *) data + roundup/4 - 2) = 0;
|
|
*((t32bits *) data + roundup/4 - 1) = 0;
|
|
|
|
/* we expect to get it in one gulp... */
|
|
if ( !file.seek(offset) || (size_t) file.read( (char *)data, pn->length ) != pn->length )
|
|
{
|
|
delete [] data;
|
|
return nullptr;
|
|
}
|
|
file.close();
|
|
|
|
pn->data = (t16bits *)data;
|
|
|
|
if ( pn->strips == nullptr && memcmp( data, FAXMAGIC, sizeof( FAXMAGIC ) - 1 ) == 0 )
|
|
{
|
|
/* handle ghostscript / PC Research fax file */
|
|
pn->length -= 64;
|
|
pn->vres = data[29];
|
|
pn->data += 32;
|
|
roundup -= 64;
|
|
}
|
|
|
|
normalize( pn, !pn->lsbfirst, ShortOrder, roundup );
|
|
if ( pn->size.height() == 0 )
|
|
pn->size.setHeight( G3count( pn, pn->expander == g32expand ) );
|
|
|
|
if ( pn->size.height() == 0 )
|
|
{
|
|
delete [] data;
|
|
pn->data = nullptr;
|
|
return nullptr;
|
|
}
|
|
|
|
if ( pn->strips == nullptr )
|
|
pn->rowsperstrip = pn->size.height();
|
|
|
|
pn->dataOrig = (t16bits *)data;
|
|
|
|
return data;
|
|
}
|
|
|
|
static void draw_line( pixnum *run, int lineNum, pagenode *pn )
|
|
{
|
|
t32bits *p, *p1; /* p - current line, p1 - low-res duplicate */
|
|
pixnum *r; /* pointer to run-lengths */
|
|
t32bits pix; /* current pixel value */
|
|
t32bits acc; /* pixel accumulator */
|
|
int nacc; /* number of valid bits in acc */
|
|
int tot; /* total pixels in line */
|
|
int n;
|
|
|
|
lineNum += pn->stripnum * pn->rowsperstrip;
|
|
if ( lineNum >= pn->size.height() )
|
|
return;
|
|
|
|
p = (t32bits *)(pn->imageData + lineNum*(2-pn->vres)*pn->bytes_per_line);
|
|
p1 =(t32bits *)(pn->vres ? nullptr : p + pn->bytes_per_line/sizeof(*p));
|
|
|
|
r = run;
|
|
acc = 0;
|
|
nacc = 0;
|
|
pix = pn->inverse ? ~0 : 0;
|
|
tot = 0;
|
|
while ( tot < pn->size.width() )
|
|
{
|
|
n = *r++;
|
|
tot += n;
|
|
/* Watch out for buffer overruns, e.g. when n == 65535. */
|
|
if ( tot > pn->size.width() )
|
|
break;
|
|
if ( pix )
|
|
acc |= (~(t32bits)0 >> nacc);
|
|
else if ( nacc )
|
|
acc &= (~(t32bits)0 << (32 - nacc));
|
|
else
|
|
acc = 0;
|
|
if ( nacc + n < 32 )
|
|
{
|
|
nacc += n;
|
|
pix = ~pix;
|
|
continue;
|
|
}
|
|
*p++ = acc;
|
|
if ( p1 )
|
|
*p1++ = acc;
|
|
n -= 32 - nacc;
|
|
while ( n >= 32 )
|
|
{
|
|
n -= 32;
|
|
*p++ = pix;
|
|
if ( p1 )
|
|
*p1++ = pix;
|
|
}
|
|
acc = pix;
|
|
nacc = n;
|
|
pix = ~pix;
|
|
}
|
|
if ( nacc )
|
|
{
|
|
*p++ = acc;
|
|
if ( p1 )
|
|
*p1++ = acc;
|
|
}
|
|
}
|
|
|
|
static bool get_image( pagenode *pn )
|
|
{
|
|
unsigned char *data = getstrip( pn, 0 );
|
|
if ( !data )
|
|
return false;
|
|
|
|
if ( !new_image( pn, pn->size.width(), (pn->vres ? 1 : 2) * pn->size.height() ) )
|
|
return false;
|
|
|
|
(*pn->expander)( pn, draw_line );
|
|
|
|
return true;
|
|
}
|
|
|
|
class FaxDocument::Private
|
|
{
|
|
public:
|
|
Private( FaxDocument *parent )
|
|
: mParent( parent )
|
|
{
|
|
mPageNode.size = QSize( 1728, 0 );
|
|
}
|
|
|
|
FaxDocument *mParent;
|
|
pagenode mPageNode;
|
|
FaxDocument::DocumentType mType;
|
|
};
|
|
|
|
FaxDocument::FaxDocument( const QString &fileName, DocumentType type )
|
|
: d( new Private( this ) )
|
|
{
|
|
d->mPageNode.filename = fileName;
|
|
d->mPageNode.strips = nullptr;
|
|
d->mPageNode.stripnum = 0;
|
|
d->mPageNode.lsbfirst = 0;
|
|
d->mPageNode.vres = 1;
|
|
d->mPageNode.inverse = 0;
|
|
d->mPageNode.data = nullptr;
|
|
d->mPageNode.dataOrig = nullptr;
|
|
d->mPageNode.imageData = nullptr;
|
|
d->mType = type;
|
|
|
|
if ( d->mType == G3 )
|
|
d->mPageNode.expander = g31expand; // or g32expand?!?
|
|
else if ( d->mType == G4 )
|
|
d->mPageNode.expander = g4expand;
|
|
}
|
|
|
|
FaxDocument::~FaxDocument()
|
|
{
|
|
delete [] d->mPageNode.dataOrig;
|
|
delete [] d->mPageNode.imageData;
|
|
delete d;
|
|
}
|
|
|
|
bool FaxDocument::load()
|
|
{
|
|
fax_init_tables();
|
|
|
|
bool ok = get_image( &(d->mPageNode) );
|
|
if ( !ok )
|
|
return false;
|
|
|
|
// byte-swapping the image
|
|
int height = d->mPageNode.size.height();
|
|
int bytes_per_line = d->mPageNode.size.width()/8;
|
|
|
|
QByteArray bytes( height * bytes_per_line, 0 );
|
|
for ( int y= height - 1; y >= 0; --y )
|
|
{
|
|
quint32 offset = y * bytes_per_line;
|
|
quint32 *source = (quint32 *) (d->mPageNode.imageData + offset);
|
|
quint32 *dest = (quint32 *) (bytes.data() + offset);
|
|
for ( int x= (bytes_per_line/4) - 1; x >= 0; --x )
|
|
{
|
|
quint32 dv = 0, sv = *source;
|
|
for ( int bit = 32; bit > 0; --bit )
|
|
{
|
|
dv <<= 1;
|
|
dv |= sv&1;
|
|
sv >>= 1;
|
|
}
|
|
*dest = dv;
|
|
++dest;
|
|
++source;
|
|
}
|
|
}
|
|
|
|
// convert it into a QImage
|
|
QImage img( (uchar*)bytes.data(), d->mPageNode.size.width(), d->mPageNode.size.height(), QImage::Format_MonoLSB );
|
|
img.setColor( 0, qRgb( 255, 255, 255 ) );
|
|
img.setColor( 1, qRgb( 0, 0, 0 ) );
|
|
|
|
d->mPageNode.image = img.copy().scaled( img.width(), img.height() * 1.5 );
|
|
|
|
return true;
|
|
}
|
|
|
|
QImage FaxDocument::image() const
|
|
{
|
|
return d->mPageNode.image;
|
|
}
|