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okular/generators/djvu/kdjvu.cpp

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/***************************************************************************
* Copyright (C) 2006 by Pino Toscano <toscano.pino@tiscali.it> *
* *
* 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 "kdjvu.h"
#include <qbytearray.h>
#include <qdom.h>
#include <qfile.h>
#include <qhash.h>
#include <qlist.h>
#include <qpainter.h>
#include <qstring.h>
#include <kdebug.h>
#include <klocale.h>
#include <libdjvu/ddjvuapi.h>
#include <libdjvu/miniexp.h>
#include <stdio.h>
kdbgstream &operator<<( kdbgstream & s, const ddjvu_rect_t &r )
{
s << "[" << r.x << "," << r.y << " - " << r.w << "x" << r.h << "]";
return s;
}
static void which_ddjvu_message( const ddjvu_message_t *msg )
{
#ifdef KDJVU_DEBUG
kDebug() << "which_djvu_message(...): " << msg->m_any.tag << endl;
switch( msg->m_any.tag )
{
case DDJVU_ERROR:
kDebug() << "ERROR: file " << msg->m_error.filename << ", line " << msg->m_error.lineno << endl;
kDebug() << "ERROR: function '" << msg->m_error.function << "'" << endl;
kDebug() << "ERROR: '" << msg->m_error.message << "'" << endl;
break;
case DDJVU_INFO:
kDebug() << "INFO: '" << msg->m_info.message << "'" << endl;
break;
case DDJVU_CHUNK:
kDebug() << "CHUNK: '" << QByteArray( msg->m_chunk.chunkid ) << "'" << endl;
break;
case DDJVU_PROGRESS:
kDebug() << "PROGRESS: '" << msg->m_progress.percent << "'" << endl;
break;
default: ;
}
#else
Q_UNUSED( msg );
#endif
}
/**
* Explore the message queue until there are message left in it.
*/
static void handle_ddjvu_messages( ddjvu_context_t *ctx, int wait )
{
const ddjvu_message_t *msg;
if ( wait )
ddjvu_message_wait( ctx );
while ( ( msg = ddjvu_message_peek( ctx ) ) )
{
which_ddjvu_message( msg );
ddjvu_message_pop( ctx );
}
}
/**
* Explore the message queue until the message \p mid is found.
*/
static void wait_for_ddjvu_message( ddjvu_context_t *ctx, ddjvu_message_tag_t mid )
{
ddjvu_message_wait( ctx );
const ddjvu_message_t *msg;
while ( ( msg = ddjvu_message_peek( ctx ) ) && msg && ( msg->m_any.tag != mid ) )
{
which_ddjvu_message( msg );
ddjvu_message_pop( ctx );
}
}
/**
* Convert a clockwise coefficient \p r for a rotation to a counter-clockwise
* and vice versa.
*/
static int flipRotation( int r )
{
return ( 4 - r ) % 4;
}
// ImageCacheItem
class ImageCacheItem
{
public:
ImageCacheItem( int p, int w, int h, const QImage& i )
: page( p ), width( w ), height( h ), img( i ) { }
int page;
int width;
int height;
QImage img;
};
// KdjVu::Page
KDjVu::Page::Page()
{
}
KDjVu::Page::~Page()
{
}
int KDjVu::Page::width() const
{
return m_width;
}
int KDjVu::Page::height() const
{
return m_height;
}
int KDjVu::Page::dpi() const
{
return m_dpi;
}
int KDjVu::Page::orientation() const
{
return m_orientation;
}
// KDjVu::Link
KDjVu::Link::~Link()
{
}
KDjVu::Link::LinkArea KDjVu::Link::areaType() const
{
return m_area;
}
QPoint KDjVu::Link::point() const
{
return m_point;
}
QSize KDjVu::Link::size() const
{
return m_size;
}
QPolygon KDjVu::Link::polygon() const
{
return m_poly;
}
// KDjVu::PageLink
KDjVu::PageLink::PageLink()
{
}
int KDjVu::PageLink::type() const
{
return KDjVu::Link::PageLink;
}
QString KDjVu::PageLink::page() const
{
return m_page;
}
// KDjVu::UrlLink
KDjVu::UrlLink::UrlLink()
{
}
int KDjVu::UrlLink::type() const
{
return KDjVu::Link::UrlLink;
}
QString KDjVu::UrlLink::url() const
{
return m_url;
}
// KDjVu::Annotation
KDjVu::Annotation::~Annotation()
{
}
QPoint KDjVu::Annotation::point() const
{
return m_point;
}
QString KDjVu::Annotation::comment() const
{
return m_comment;
}
QColor KDjVu::Annotation::color() const
{
return m_color;
}
// KDjVu::TextAnnotation
KDjVu::TextAnnotation::TextAnnotation()
: m_inlineText( true )
{
}
QSize KDjVu::TextAnnotation::size() const
{
return m_size;
}
int KDjVu::TextAnnotation::type() const
{
return KDjVu::Annotation::TextAnnotation;
}
bool KDjVu::TextAnnotation::inlineText() const
{
return m_inlineText;
}
// KDjVu::LineAnnotation
KDjVu::LineAnnotation::LineAnnotation()
: m_isArrow( false ), m_width( 1 )
{
}
int KDjVu::LineAnnotation::type() const
{
return KDjVu::Annotation::LineAnnotation;
}
QPoint KDjVu::LineAnnotation::point2() const
{
return m_point2;
}
bool KDjVu::LineAnnotation::isArrow() const
{
return m_isArrow;
}
int KDjVu::LineAnnotation::width() const
{
return m_width;
}
class KDjVu::Private
{
public:
Private()
: m_djvu_cxt( 0 ), m_djvu_document( 0 ), m_format( 0 ), m_docBookmarks( 0 )
{
}
QImage generateImageTile( ddjvu_page_t *djvupage, int& res,
int width, int row, int xdelta, int height, int col, int ydelta );
void readBookmarks();
void fillBookmarksRecurse( QDomDocument& maindoc, QDomNode& curnode,
miniexp_t exp, int offset = -1 );
void readMetaData( int page );
ddjvu_context_t *m_djvu_cxt;
ddjvu_document_t *m_djvu_document;
ddjvu_format_t *m_format;
unsigned int* m_formatmask;
QVector<KDjVu::Page*> m_pages;
QVector<ddjvu_page_t *> m_pages_cache;
QList<ImageCacheItem*> mImgCache;
QHash<QString, QVariant> m_metaData;
QDomDocument * m_docBookmarks;
};
QImage KDjVu::Private::generateImageTile( ddjvu_page_t *djvupage, int& res,
int width, int row, int xdelta, int height, int col, int ydelta )
{
ddjvu_rect_t renderrect;
renderrect.x = row * xdelta;
renderrect.y = col * ydelta;
int realwidth = qMin( width - renderrect.x, xdelta );
int realheight = qMin( height - renderrect.y, ydelta );
renderrect.w = realwidth;
renderrect.h = realheight;
#ifdef KDJVU_DEBUG
kDebug() << "renderrect: " << renderrect << endl;
#endif
ddjvu_rect_t pagerect;
pagerect.x = 0;
pagerect.y = 0;
pagerect.w = width;
pagerect.h = height;
#ifdef KDJVU_DEBUG
kDebug() << "pagerect: " << pagerect << endl;
#endif
handle_ddjvu_messages( m_djvu_cxt, false );
char* imagebuffer = new char[ realwidth * realheight * 4 + 1 ];
res = ddjvu_page_render( djvupage, DDJVU_RENDER_COLOR,
&pagerect, &renderrect, m_format, realwidth * 4, imagebuffer );
#ifdef KDJVU_DEBUG
kDebug() << "rendering result: " << res << endl;
#endif
handle_ddjvu_messages( m_djvu_cxt, false );
QImage res_img;
if ( res )
{
QImage img( (uchar*)imagebuffer, realwidth, realheight, QImage::Format_RGB32 );
res_img = img.copy();
}
delete [] imagebuffer;
return res_img;
}
void KDjVu::Private::readBookmarks()
{
if ( !m_djvu_document )
return;
miniexp_t outline;
while ( ( outline = ddjvu_document_get_outline( m_djvu_document ) ) == miniexp_dummy )
handle_ddjvu_messages( m_djvu_cxt, true );
if ( miniexp_listp( outline ) &&
( miniexp_length( outline ) > 0 ) &&
miniexp_symbolp( miniexp_nth( 0, outline ) ) &&
( QString::fromUtf8( miniexp_to_name( miniexp_nth( 0, outline ) ) ) == QLatin1String( "bookmarks" ) ) )
{
m_docBookmarks = new QDomDocument( "KDjVuBookmarks" );
fillBookmarksRecurse( *m_docBookmarks, *m_docBookmarks, outline, 1 );
}
}
void KDjVu::Private::fillBookmarksRecurse( QDomDocument& maindoc, QDomNode& curnode,
miniexp_t exp, int offset )
{
if ( !miniexp_listp( exp ) )
return;
int l = miniexp_length( exp );
for ( int i = qMax( offset, 0 ); i < l; ++i )
{
miniexp_t cur = miniexp_nth( i, exp );
if ( miniexp_consp( cur ) && ( miniexp_length( cur ) > 0 ) &&
miniexp_stringp( miniexp_nth( 0, cur ) ) && miniexp_stringp( miniexp_nth( 1, cur ) ) )
{
QString title = QString::fromUtf8( miniexp_to_str( miniexp_nth( 0, cur ) ) );
QString dest = QString::fromUtf8( miniexp_to_str( miniexp_nth( 1, cur ) ) );
QDomElement el;
if ( dest.isEmpty() || ( ( dest.at( 0 ) == QLatin1Char( '#' ) ) && ( dest.remove( 0, 1 ) != title ) ) )
{
el = maindoc.createElement( "item" );
el.setAttribute( "title", title );
el.setAttribute( "destination", dest );
curnode.appendChild( el );
}
if ( !el.isNull() && ( miniexp_length( cur ) > 2 ) )
{
fillBookmarksRecurse( maindoc, el, cur, 2 );
}
}
}
}
void KDjVu::Private::readMetaData( int page )
{
if ( !m_djvu_document )
return;
miniexp_t annots;
while ( ( annots = ddjvu_document_get_pageanno( m_djvu_document, page ) ) == miniexp_dummy )
handle_ddjvu_messages( m_djvu_cxt, true );
if ( !miniexp_listp( annots ) || miniexp_length( annots ) == 0 )
return;
miniexp_t exp = miniexp_nth( 0, annots );
int size = miniexp_length( exp );
if ( size <= 1 ||
qstrncmp( miniexp_to_name( miniexp_nth( 0, exp ) ), "metadata", 8 ) )
return;
for ( int i = 1; i < size; ++i )
{
miniexp_t cur = miniexp_nth( i, exp );
if ( miniexp_length( cur ) != 2 )
continue;
QString id = QString::fromUtf8( miniexp_to_name( miniexp_nth( 0, cur ) ) );
QString value = QString::fromUtf8( miniexp_to_str( miniexp_nth( 1, cur ) ) );
m_metaData[ id.toLower() ] = value;
}
}
KDjVu::KDjVu() : QObject(), d( new Private )
{
// creating the djvu context
d->m_djvu_cxt = ddjvu_context_create( "KDjVu" );
// creating the rendering format
d->m_formatmask = new unsigned int[3];
d->m_formatmask[0] = 0x00ff0000;
d->m_formatmask[1] = 0x0000ff00;
d->m_formatmask[2] = 0x000000ff;
d->m_format = ddjvu_format_create( DDJVU_FORMAT_RGBMASK32, 3, d->m_formatmask );
ddjvu_format_set_row_order( d->m_format, 1 );
ddjvu_format_set_y_direction( d->m_format, 1 );
}
KDjVu::~KDjVu()
{
closeFile();
ddjvu_format_release( d->m_format );
delete [] d->m_formatmask;
ddjvu_context_release( d->m_djvu_cxt );
delete d;
}
bool KDjVu::openFile( const QString & fileName )
{
// first, close the old file
if ( d->m_djvu_document )
closeFile();
// load the document...
d->m_djvu_document = ddjvu_document_create_by_filename( d->m_djvu_cxt, QFile::encodeName( fileName ), true );
if ( !d->m_djvu_document ) return false;
// ...and wait for its loading
wait_for_ddjvu_message( d->m_djvu_cxt, DDJVU_DOCINFO );
kDebug() << "# of pages: " << ddjvu_document_get_pagenum( d->m_djvu_document ) << endl;
int numofpages = ddjvu_document_get_pagenum( d->m_djvu_document );
d->m_pages.clear();
d->m_pages.resize( numofpages );
d->m_pages_cache.clear();
d->m_pages_cache.resize( numofpages );
// get the document type
QString doctype;
switch ( ddjvu_document_get_type( d->m_djvu_document ) )
{
case DDJVU_DOCTYPE_UNKNOWN:
doctype = i18nc( "Type of DjVu document", "Unknown" );
break;
case DDJVU_DOCTYPE_SINGLEPAGE:
doctype = i18nc( "Type of DjVu document", "Single Page" );
break;
case DDJVU_DOCTYPE_BUNDLED:
doctype = i18nc( "Type of DjVu document", "Bundled" );
break;
case DDJVU_DOCTYPE_INDIRECT:
doctype = i18nc( "Type of DjVu document", "Indirect" );
break;
case DDJVU_DOCTYPE_OLD_BUNDLED:
doctype = i18nc( "Type of DjVu document", "Bundled (old)" );
break;
case DDJVU_DOCTYPE_OLD_INDEXED:
doctype = i18nc( "Type of DjVu document", "Indexed (old)" );
break;
}
if ( !doctype.isEmpty() )
d->m_metaData[ "documentType" ] = doctype;
// get the number of components
d->m_metaData[ "componentFile" ] = ddjvu_document_get_filenum( d->m_djvu_document );
// read the pages
for ( int i = 0; i < numofpages; ++i )
{
ddjvu_status_t sts;
ddjvu_pageinfo_t info;
while ( ( sts = ddjvu_document_get_pageinfo( d->m_djvu_document, i, &info ) ) < DDJVU_JOB_OK )
handle_ddjvu_messages( d->m_djvu_cxt, true );
if ( sts >= DDJVU_JOB_FAILED )
{
kDebug() << "\t>>> page " << i << " failed: " << sts << endl;
return false;
}
KDjVu::Page *p = new KDjVu::Page();
p->m_width = info.width;
p->m_height = info.height;
p->m_dpi = info.dpi;
#if DDJVUAPI_VERSION >= 18
p->m_orientation = flipRotation( info.rotation );
#else
p->m_orientation = 0;
#endif
d->m_pages[i] = p;
}
// reading the metadata from the first page only should be enough
if ( numofpages > 0 )
d->readMetaData( 0 );
return true;
}
void KDjVu::closeFile()
{
// deleting the old TOC
delete d->m_docBookmarks;
d->m_docBookmarks = 0;
// deleting the pages
qDeleteAll( d->m_pages );
d->m_pages.clear();
// releasing the djvu pages
QVector<ddjvu_page_t *>::Iterator it = d->m_pages_cache.begin(), itEnd = d->m_pages_cache.end();
for ( ; it != itEnd; ++it )
ddjvu_page_release( *it );
d->m_pages_cache.clear();
// clearing the image cache
qDeleteAll( d->mImgCache );
d->mImgCache.clear();
// clearing the old metadata
d->m_metaData.clear();
// releasing the old document
if ( d->m_djvu_document )
ddjvu_document_release( d->m_djvu_document );
d->m_djvu_document = 0;
}
QVariant KDjVu::metaData( const QString & key ) const
{
QHash<QString, QVariant>::ConstIterator it = d->m_metaData.find( key );
return it != d->m_metaData.end() ? it.value() : QVariant();
}
const QDomDocument * KDjVu::documentBookmarks() const
{
if ( !d->m_docBookmarks )
d->readBookmarks();
return d->m_docBookmarks;
}
void KDjVu::linksAndAnnotationsForPage( int pageNum, QList<KDjVu::Link*> *links, QList<KDjVu::Annotation*> *annotations ) const
{
if ( ( pageNum < 0 ) || ( pageNum >= d->m_pages.count() ) || ( !links && !annotations ) )
return;
miniexp_t annots;
while ( ( annots = ddjvu_document_get_pageanno( d->m_djvu_document, pageNum ) ) == miniexp_dummy )
handle_ddjvu_messages( d->m_djvu_cxt, true );
if ( !miniexp_listp( annots ) )
return;
if ( links )
links->clear();
if ( annotations )
annotations->clear();
int l = miniexp_length( annots );
for ( int i = 0; i < l; ++i )
{
miniexp_t cur = miniexp_nth( i, annots );
int num = miniexp_length( cur );
if ( ( num < 4 ) || !miniexp_symbolp( miniexp_nth( 0, cur ) ) ||
( qstrncmp( miniexp_to_name( miniexp_nth( 0, cur ) ), "maparea", 7 ) != 0 ) )
continue;
QString target;
QString type;
if ( miniexp_symbolp( miniexp_nth( 0, miniexp_nth( 3, cur ) ) ) )
type = QString::fromUtf8( miniexp_to_name( miniexp_nth( 0, miniexp_nth( 3, cur ) ) ) );
KDjVu::Link* link = 0;
KDjVu::Annotation* ann = 0;
miniexp_t urlexp = miniexp_nth( 1, cur );
if ( links &&
( type == QLatin1String( "rect" ) ||
type == QLatin1String( "oval" ) ||
type == QLatin1String( "poly" ) ) )
{
if ( miniexp_stringp( urlexp ) )
{
target = QString::fromUtf8( miniexp_to_str( miniexp_nth( 1, cur ) ) );
}
else if ( miniexp_listp( urlexp ) && ( miniexp_length( urlexp ) == 3 ) &&
miniexp_symbolp( miniexp_nth( 0, urlexp ) ) &&
( qstrncmp( miniexp_to_name( miniexp_nth( 0, urlexp ) ), "url", 3 ) == 0 ) )
{
target = QString::fromUtf8( miniexp_to_str( miniexp_nth( 1, urlexp ) ) );
}
if ( target.isEmpty() || ( ( target.length() > 0 ) && target.at(0) == QLatin1Char( '#' ) ) )
{
KDjVu::PageLink* plink = new KDjVu::PageLink();
plink->m_page = target;
link = plink;
}
else
{
KDjVu::UrlLink* ulink = new KDjVu::UrlLink();
ulink->m_url = target;
link = ulink;
}
}
else if ( annotations &&
( type == QLatin1String( "text" ) ||
type == QLatin1String( "line" ) ) )
{
miniexp_t area = miniexp_nth( 3, cur );
int a = miniexp_to_int( miniexp_nth( 1, area ) );
int b = miniexp_to_int( miniexp_nth( 2, area ) );
int c = miniexp_to_int( miniexp_nth( 3, area ) );
int d = miniexp_to_int( miniexp_nth( 4, area ) );
if ( type == QLatin1String( "text" ) )
{
KDjVu::TextAnnotation * textann = new KDjVu::TextAnnotation();
textann->m_size = QSize( c, d );
ann = textann;
}
else if ( type == QLatin1String( "line" ) )
{
KDjVu::LineAnnotation * lineann = new KDjVu::LineAnnotation();
lineann->m_point2 = QPoint( c, d );
ann = lineann;
}
ann->m_point = QPoint( a, b );
ann->m_comment = QString::fromUtf8( miniexp_to_str( miniexp_nth( 2, cur ) ) );
}
if ( link /* safety check */ && links )
{
link->m_area = KDjVu::Link::UnknownArea;
miniexp_t area = miniexp_nth( 3, cur );
int arealength = miniexp_length( area );
if ( ( arealength == 5 ) && ( type == QLatin1String( "rect" ) || type == QLatin1String( "oval" ) ) )
{
link->m_point = QPoint( miniexp_to_int( miniexp_nth( 1, area ) ), miniexp_to_int( miniexp_nth( 2, area ) ) );
link->m_size = QSize( miniexp_to_int( miniexp_nth( 3, area ) ), miniexp_to_int( miniexp_nth( 4, area ) ) );
if ( type == QLatin1String( "rect" ) )
{
link->m_area = KDjVu::Link::RectArea;
}
else
{
link->m_area = KDjVu::Link::EllipseArea;
}
}
else if ( ( arealength > 0 ) && ( arealength % 2 == 1 ) &&
type == QLatin1String( "poly" ) )
{
link->m_area = KDjVu::Link::PolygonArea;
QPolygon poly;
for ( int j = 1; j < arealength; j += 2 )
{
poly << QPoint( miniexp_to_int( miniexp_nth( j, area ) ), miniexp_to_int( miniexp_nth( j + 1, area ) ) );
}
link->m_poly = poly;
}
if ( link->m_area != KDjVu::Link::UnknownArea )
links->append( link );
}
else if ( ann /* safety check */ && annotations )
{
if ( type == QLatin1String( "text" ) )
{
KDjVu::TextAnnotation* txtann = (KDjVu::TextAnnotation*)ann;
txtann->m_color.setRgb( 255, 255, 255, 0 );
for ( int j = 4; j < num; ++j )
{
miniexp_t curelem = miniexp_nth( j, cur );
if ( !miniexp_listp( curelem ) )
continue;
QString id = QString::fromUtf8( miniexp_to_name( miniexp_nth( 0, curelem ) ) );
if ( id == QLatin1String( "backclr" ) )
txtann->m_color.setNamedColor( QString::fromUtf8( miniexp_to_name( miniexp_nth( 1, curelem ) ) ) );
else if ( id == QLatin1String( "pushpin" ) )
txtann->m_inlineText = false;
}
}
else if ( type == QLatin1String( "line" ) )
{
KDjVu::LineAnnotation* lineann = (KDjVu::LineAnnotation*)ann;
lineann->m_color = Qt::black;
for ( int j = 4; j < num; ++j )
{
miniexp_t curelem = miniexp_nth( j, cur );
if ( !miniexp_listp( curelem ) )
continue;
QString id = QString::fromUtf8( miniexp_to_name( miniexp_nth( 0, curelem ) ) );
if ( id == QLatin1String( "lineclr" ) )
lineann->m_color.setNamedColor( QString::fromUtf8( miniexp_to_name( miniexp_nth( 1, curelem ) ) ) );
else if ( id == QLatin1String( "arrow" ) )
lineann->m_isArrow = true;
else if ( id == QLatin1String( "width" ) )
lineann->m_width = miniexp_to_int( miniexp_nth( 1, curelem ) );
}
}
annotations->append( ann );
}
}
}
const QVector<KDjVu::Page*> &KDjVu::pages() const
{
return d->m_pages;
}
QImage KDjVu::image( int page, int width, int height, int rotation )
{
bool found = false;
QList<ImageCacheItem*>::Iterator it = d->mImgCache.begin(), itEnd = d->mImgCache.end();
for ( ; ( it != itEnd ) && !found; ++it )
{
ImageCacheItem* cur = *it;
if ( ( cur->page == page ) &&
( rotation % 2 == 0
? cur->width == width && cur->height == height
: cur->width == height && cur->height == width ) )
found = true;
}
if ( !found )
return QImage();
// taking the element and pushing to the top of the list
--it;
ImageCacheItem* cur2 = *it;
d->mImgCache.erase( it );
d->mImgCache.push_front( cur2 );
return cur2->img;
}
void KDjVu::requestImage( int page, int width, int height, int rotation )
{
QImage tmp = image( page, width, height, rotation );
if ( !tmp.isNull() )
{
emit imageGenerated( page, tmp );
return;
}
if ( !d->m_pages_cache.at( page ) )
{
ddjvu_page_t *newpage = ddjvu_page_create_by_pageno( d->m_djvu_document, page );
// wait for the new page to be loaded
ddjvu_status_t sts;
while ( ( sts = ddjvu_page_decoding_status( newpage ) ) < DDJVU_JOB_OK )
handle_ddjvu_messages( d->m_djvu_cxt, true );
d->m_pages_cache[page] = newpage;
}
ddjvu_page_t *djvupage = d->m_pages_cache[page];
/*
if ( ddjvu_page_get_rotation( djvupage ) != flipRotation( rotation ) )
{
// TODO: test documents with initial rotation != 0
// ddjvu_page_set_rotation( djvupage, m_pages.at( page )->orientation() );
ddjvu_page_set_rotation( djvupage, (ddjvu_page_rotation_t)flipRotation( rotation ) );
}
*/
static const int xdelta = 1500;
static const int ydelta = 1500;
int xparts = width / xdelta + 1;
int yparts = height / ydelta + 1;
QImage newimg( width, height, QImage::Format_RGB32 );
int res = 10000;
if ( ( xparts == 1 ) && ( yparts == 1 ) )
{
// only one part -- render at once with no need to auxiliary image
newimg = d->generateImageTile( djvupage, res,
width, 0, xdelta, height, 0, ydelta );
}
else
{
// more than one part -- need to render piece-by-piece and to compose
// the results
QPainter p;
p.begin( &newimg );
int parts = xparts * yparts;
for ( int i = 0; i < parts; ++i )
{
int row = i % xparts;
int col = i / xparts;
int tmpres = 0;
QImage tempp = d->generateImageTile( djvupage, tmpres,
width, row, xdelta, height, col, ydelta );
if ( tmpres )
{
p.drawImage( row * xdelta, col * ydelta, tempp );
}
res = qMin( tmpres, res );
}
p.end();
}
QImage resimg;
if ( res )
{
resimg = newimg;
// delete all the cached pixmaps for the current page with a size that
// differs no more than 35% of the new pixmap size
int imgsize = resimg.width() * resimg.height();
if ( imgsize > 0 )
{
for( int i = 0; i < d->mImgCache.count(); )
{
ImageCacheItem* cur = d->mImgCache.at(i);
if ( ( cur->page == page ) &&
( abs( cur->img.width() * cur->img.height() - imgsize ) < imgsize * 0.35 ) )
{
d->mImgCache.removeAt( i );
delete cur;
}
else
++i;
}
}
// the image cache has too many elements, remove the last
if ( d->mImgCache.size() >= 10 )
{
delete d->mImgCache.last();
d->mImgCache.removeLast();
}
ImageCacheItem* ich = new ImageCacheItem( page, width, height, newimg );
d->mImgCache.push_front( ich );
}
emit imageGenerated( page, newimg );
}
bool KDjVu::exportAsPostScript( const QString & fileName, const QList<int>& pageList ) const
{
if ( !d->m_djvu_document || fileName.trimmed().isEmpty() || pageList.isEmpty() )
return false;
QByteArray fn = QFile::encodeName( fileName );
FILE* f = fopen( fn.constData(), "w+" );
if ( !f )
{
kDebug() << "KDjVu::exportAsPostScript(): error while opening the file" << endl;
return false;
}
QString pl;
foreach ( int p, pageList )
{
if ( !pl.isEmpty() )
pl += QString::fromLatin1( "," );
pl += QString::number( p );
}
pl.prepend( "-page=" );
// setting the options
static const int optc = 1;
const char ** optv = (const char**)malloc( 1 * sizeof( char* ) );
QByteArray plb = pl.toAscii();
optv[0] = plb.constData();
ddjvu_job_t *printjob = ddjvu_document_print( d->m_djvu_document, f, optc, optv );
while ( !ddjvu_job_done( printjob ) )
handle_ddjvu_messages( d->m_djvu_cxt, true );
free( optv );
return fclose( f ) == 0;
}
#include "kdjvu.moc"