/**************************************************************************** ** ** Implementation of QPicture class ** ** Created : 940802 ** ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the kernel module of the Qt GUI Toolkit. ** ** This file may be used under the terms of the GNU General ** Public License versions 2.0 or 3.0 as published by the Free ** Software Foundation and appearing in the files LICENSE.GPL2 ** and LICENSE.GPL3 included in the packaging of this file. ** Alternatively you may (at your option) use any later version ** of the GNU General Public License if such license has been ** publicly approved by Trolltech ASA (or its successors, if any) ** and the KDE Free Qt Foundation. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** This file may be used under the terms of the Q Public License as ** defined by Trolltech ASA and appearing in the file LICENSE.QPL ** included in the packaging of this file. Licensees holding valid Qt ** Commercial licenses may use this file in accordance with the Qt ** Commercial License Agreement provided with the Software. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted ** herein. ** **********************************************************************/ #include "qpicture.h" #ifndef QT_NO_PICTURE #include "qpainter.h" #include "qpixmap.h" #include "qimage.h" #include "qfile.h" #include "qdatastream.h" #include "qpaintdevicemetrics.h" #ifndef QT_NO_SVG #include "private/qsvgdevice_p.h" #endif /*! \class QPicture qpicture.h \brief The QPicture class is a paint device that records and replays QPainter commands. \ingroup graphics \ingroup images \ingroup shared A picture serializes painter commands to an IO device in a platform-independent format. For example, a picture created under Windows can be read on a Sun SPARC. Pictures are called meta-files on some platforms. Qt pictures use a proprietary binary format. Unlike native picture (meta-file) formats on many window systems, Qt pictures have no limitations regarding their contents. Everything that can be painted can also be stored in a picture, e.g. fonts, pixmaps, regions, transformed graphics, etc. QPicture is an \link shclass.html implicitly shared\endlink class. Example of how to record a picture: \code QPicture pic; QPainter p; p.begin( &pic ); // paint in picture p.drawEllipse( 10,20, 80,70 ); // draw an ellipse p.end(); // painting done pic.save( "drawing.pic" ); // save picture \endcode Example of how to replay a picture: \code QPicture pic; pic.load( "drawing.pic" ); // load picture QPainter p; p.begin( &myWidget ); // paint in myWidget p.drawPicture( pic ); // draw the picture p.end(); // painting done \endcode Pictures can also be drawn using play(). Some basic data about a picture is available, for example, size(), isNull() and boundingRect(). */ static const char *mfhdr_tag = "QPIC"; // header tag static const Q_UINT16 mfhdr_maj = 5; // major version # static const Q_UINT16 mfhdr_min = 0; // minor version # /*! Constructs an empty picture. The \a formatVersion parameter may be used to \e create a QPicture that can be read by applications that are compiled with earlier versions of Qt. \list \i \a formatVersion == 1 is binary compatible with Qt 1.x and later. \i \a formatVersion == 2 is binary compatible with Qt 2.0.x and later. \i \a formatVersion == 3 is binary compatible with Qt 2.1.x and later. \i \a formatVersion == 4 is binary compatible with Qt 3.0.x and later. \i \a formatVersion == 5 is binary compatible with Qt 3.1. \endlist Note that the default formatVersion is -1 which signifies the current release, i.e. for Qt 3.1 a formatVersion of 5 is the same as the default formatVersion of -1. Reading pictures generated by earlier versions of Qt is supported and needs no special coding; the format is automatically detected. */ QPicture::QPicture( int formatVersion ) : QPaintDevice( QInternal::Picture | QInternal::ExternalDevice ) // set device type { d = new QPicturePrivate; #if defined(QT_CHECK_RANGE) if ( formatVersion == 0 ) qWarning( "QPicture: invalid format version 0" ); #endif // still accept the 0 default from before Qt 3.0. if ( formatVersion > 0 && formatVersion != (int)mfhdr_maj ) { d->formatMajor = formatVersion; d->formatMinor = 0; d->formatOk = FALSE; } else { d->resetFormat(); } } /*! Constructs a \link shclass.html shallow copy\endlink of \a pic. */ QPicture::QPicture( const QPicture &pic ) : QPaintDevice( QInternal::Picture | QInternal::ExternalDevice ) { d = pic.d; d->ref(); } /*! Destroys the picture. */ QPicture::~QPicture() { if ( d->deref() ) delete d; } /*! \fn bool QPicture::isNull() const Returns TRUE if the picture contains no data; otherwise returns FALSE. */ /*! \fn uint QPicture::size() const Returns the size of the picture data. \sa data() */ /*! \fn const char* QPicture::data() const Returns a pointer to the picture data. The pointer is only valid until the next non-const function is called on this picture. The returned pointer is 0 if the picture contains no data. \sa size(), isNull() */ /*! Sets the picture data directly from \a data and \a size. This function copies the input data. \sa data(), size() */ void QPicture::setData( const char* data, uint size ) { detach(); QByteArray a( size ); memcpy( a.data(), data, size ); d->pictb.setBuffer( a ); // set byte array in buffer d->resetFormat(); // we'll have to check } /*! Loads a picture from the file specified by \a fileName and returns TRUE if successful; otherwise returns FALSE. By default, the file will be interpreted as being in the native QPicture format. Specifying the \a format string is optional and is only needed for importing picture data stored in a different format. Currently, the only external format supported is the \link http://www.w3.org/Graphics/SVG/ W3C SVG \endlink format which requires the \link xml.html Qt XML module \endlink. The corresponding \a format string is "svg". \sa save() */ bool QPicture::load( const QString &fileName, const char *format ) { QFile f( fileName ); if ( !f.open(IO_ReadOnly) ) return FALSE; return load( &f, format ); } /*! \overload \a dev is the device to use for loading. */ bool QPicture::load( QIODevice *dev, const char *format ) { #ifndef QT_NO_SVG if ( qstrcmp( format, "svg" ) == 0 ) { QSvgDevice svg; if ( !svg.load( dev ) ) return FALSE; QPainter p( this ); bool b = svg.play( &p ); d->brect = svg.boundingRect(); return b; } #endif if ( format ) { qWarning( "QPicture::load: No such picture format: %s", format ); return FALSE; } detach(); QByteArray a = dev->readAll(); d->pictb.setBuffer( a ); // set byte array in buffer return d->checkFormat(); } /*! Saves a picture to the file specified by \a fileName and returns TRUE if successful; otherwise returns FALSE. Specifying the file \a format string is optional. It's not recommended unless you intend to export the picture data for use by a third party reader. By default the data will be saved in the native QPicture file format. Currently, the only external format supported is the \link http://www.w3.org/Graphics/SVG/ W3C SVG \endlink format which requires the \link xml.html Qt XML module \endlink. The corresponding \a format string is "svg". \sa load() */ bool QPicture::save( const QString &fileName, const char *format ) { if ( paintingActive() ) { #if defined(QT_CHECK_STATE) qWarning( "QPicture::save: still being painted on. " "Call QPainter::end() first" ); #endif return FALSE; } #ifndef QT_NO_SVG // identical to QIODevice* code below but the file name // makes a difference when it comes to saving pixmaps if ( qstricmp( format, "svg" ) == 0 ) { QSvgDevice svg; QPainter p( &svg ); if ( !play( &p ) ) return FALSE; svg.setBoundingRect( boundingRect() ); return svg.save( fileName ); } #endif QFile f( fileName ); if ( !f.open(IO_WriteOnly) ) return FALSE; return save( &f, format ); } /*! \overload \a dev is the device to use for saving. */ bool QPicture::save( QIODevice *dev, const char *format ) { if ( paintingActive() ) { #if defined(QT_CHECK_STATE) qWarning( "QPicture::save: still being painted on. " "Call QPainter::end() first" ); #endif return FALSE; } #ifndef QT_NO_SVG if ( qstricmp( format, "svg" ) == 0 ) { QSvgDevice svg; QPainter p( &svg ); if ( !play( &p ) ) return FALSE; svg.setBoundingRect( boundingRect() ); return svg.save( dev ); } #endif if ( format ) { qWarning( "QPicture::save: No such picture format: %s", format ); return FALSE; } dev->writeBlock( d->pictb.buffer().data(), d->pictb.buffer().size() ); return TRUE; } /*! Returns the picture's bounding rectangle or an invalid rectangle if the picture contains no data. */ QRect QPicture::boundingRect() const { if ( !d->formatOk ) d->checkFormat(); return d->brect; } /*! Sets the picture's bounding rectangle to \a r. The automatically calculated value is overriden. */ void QPicture::setBoundingRect( const QRect &r ) { if ( !d->formatOk ) d->checkFormat(); d->brect = r; } /*! Replays the picture using \a painter, and returns TRUE if successful; otherwise returns FALSE. This function does exactly the same as QPainter::drawPicture() with (x, y) = (0, 0). */ bool QPicture::play( QPainter *painter ) { if ( d->pictb.size() == 0 ) // nothing recorded return TRUE; if ( !d->formatOk && !d->checkFormat() ) return FALSE; d->pictb.open( IO_ReadOnly ); // open buffer device QDataStream s; s.setDevice( &d->pictb ); // attach data stream to buffer s.device()->at( 10 ); // go directly to the data s.setVersion( d->formatMajor == 4 ? 3 : d->formatMajor ); Q_UINT8 c, clen; Q_UINT32 nrecords; s >> c >> clen; Q_ASSERT( c == PdcBegin ); // bounding rect was introduced in ver 4. Read in checkFormat(). if ( d->formatMajor >= 4 ) { Q_INT32 dummy; s >> dummy >> dummy >> dummy >> dummy; } s >> nrecords; if ( !exec( painter, s, nrecords ) ) { #if defined(QT_CHECK_RANGE) qWarning( "QPicture::play: Format error" ); #endif d->pictb.close(); return FALSE; } d->pictb.close(); return TRUE; // no end-command } /*! \internal Iterates over the internal picture data and draws the picture using \a painter. */ bool QPicture::exec( QPainter *painter, QDataStream &s, int nrecords ) { #if defined(QT_DEBUG) int strm_pos; #endif Q_UINT8 c; // command id Q_UINT8 tiny_len; // 8-bit length descriptor Q_INT32 len; // 32-bit length descriptor Q_INT16 i_16, i1_16, i2_16; // parameters... Q_INT8 i_8; Q_UINT32 ul; QCString str1; QString str; QPoint p, p1, p2; QRect r; QPointArray a; QColor color; QFont font; QPen pen; QBrush brush; QRegion rgn; #ifndef QT_NO_TRANSFORMATIONS QWMatrix matrix; #endif while ( nrecords-- && !s.eof() ) { s >> c; // read cmd s >> tiny_len; // read param length if ( tiny_len == 255 ) // longer than 254 bytes s >> len; else len = tiny_len; #if defined(QT_DEBUG) strm_pos = s.device()->at(); #endif switch ( c ) { // exec cmd case PdcNOP: break; case PdcDrawPoint: s >> p; painter->drawPoint( p ); break; case PdcMoveTo: s >> p; painter->moveTo( p ); break; case PdcLineTo: s >> p; painter->lineTo( p ); break; case PdcDrawLine: s >> p1 >> p2; painter->drawLine( p1, p2 ); break; case PdcDrawRect: s >> r; painter->drawRect( r ); break; case PdcDrawRoundRect: s >> r >> i1_16 >> i2_16; painter->drawRoundRect( r, i1_16, i2_16 ); break; case PdcDrawEllipse: s >> r; painter->drawEllipse( r ); break; case PdcDrawArc: s >> r >> i1_16 >> i2_16; painter->drawArc( r, i1_16, i2_16 ); break; case PdcDrawPie: s >> r >> i1_16 >> i2_16; painter->drawPie( r, i1_16, i2_16 ); break; case PdcDrawChord: s >> r >> i1_16 >> i2_16; painter->drawChord( r, i1_16, i2_16 ); break; case PdcDrawLineSegments: s >> a; painter->drawLineSegments( a ); break; case PdcDrawPolyline: s >> a; painter->drawPolyline( a ); break; case PdcDrawPolygon: s >> a >> i_8; painter->drawPolygon( a, i_8 ); break; case PdcDrawCubicBezier: s >> a; #ifndef QT_NO_BEZIER painter->drawCubicBezier( a ); #endif break; case PdcDrawText: s >> p >> str1; painter->drawText( p, str1 ); break; case PdcDrawTextFormatted: s >> r >> i_16 >> str1; painter->drawText( r, i_16, str1 ); break; case PdcDrawText2: s >> p >> str; painter->drawText( p, str ); break; case PdcDrawText2Formatted: s >> r >> i_16 >> str; painter->drawText( r, i_16, str ); break; case PdcDrawPixmap: { QPixmap pixmap; if ( d->formatMajor < 4 ) { s >> p >> pixmap; painter->drawPixmap( p, pixmap ); } else { s >> r >> pixmap; painter->drawPixmap( r, pixmap ); } } break; case PdcDrawImage: { QImage image; if ( d->formatMajor < 4 ) { s >> p >> image; painter->drawImage( p, image ); } else { s >> r >> image; painter->drawImage( r, image ); } } break; case PdcBegin: s >> ul; // number of records if ( !exec( painter, s, ul ) ) return FALSE; break; case PdcEnd: if ( nrecords == 0 ) return TRUE; break; case PdcSave: painter->save(); break; case PdcRestore: painter->restore(); break; case PdcSetBkColor: s >> color; painter->setBackgroundColor( color ); break; case PdcSetBkMode: s >> i_8; painter->setBackgroundMode( (Qt::BGMode)i_8 ); break; case PdcSetROP: s >> i_8; painter->setRasterOp( (Qt::RasterOp)i_8 ); break; case PdcSetBrushOrigin: s >> p; painter->setBrushOrigin( p ); break; case PdcSetFont: s >> font; painter->setFont( font ); break; case PdcSetPen: s >> pen; painter->setPen( pen ); break; case PdcSetBrush: s >> brush; painter->setBrush( brush ); break; case PdcSetTabStops: s >> i_16; painter->setTabStops( i_16 ); break; case PdcSetTabArray: s >> i_16; if ( i_16 == 0 ) { painter->setTabArray( 0 ); } else { int *ta = new int[i_16]; Q_CHECK_PTR( ta ); for ( int i=0; i<i_16; i++ ) { s >> i1_16; ta[i] = i1_16; } painter->setTabArray( ta ); delete [] ta; } break; case PdcSetVXform: s >> i_8; #ifndef QT_NO_TRANSFORMATIONS painter->setViewXForm( i_8 ); #endif break; case PdcSetWindow: s >> r; #ifndef QT_NO_TRANSFORMATIONS painter->setWindow( r ); #endif break; case PdcSetViewport: s >> r; #ifndef QT_NO_TRANSFORMATIONS painter->setViewport( r ); #endif break; case PdcSetWXform: s >> i_8; #ifndef QT_NO_TRANSFORMATIONS painter->setWorldXForm( i_8 ); #endif break; case PdcSetWMatrix: #ifndef QT_NO_TRANSFORMATIONS // #### fix me! s >> matrix >> i_8; painter->setWorldMatrix( matrix, i_8 ); #endif break; #ifndef QT_NO_TRANSFORMATIONS case PdcSaveWMatrix: painter->saveWorldMatrix(); break; case PdcRestoreWMatrix: painter->restoreWorldMatrix(); break; #endif case PdcSetClip: s >> i_8; painter->setClipping( i_8 ); break; case PdcSetClipRegion: s >> rgn >> i_8; painter->setClipRegion( rgn, (QPainter::CoordinateMode)i_8 ); break; default: #if defined(QT_CHECK_RANGE) qWarning( "QPicture::play: Invalid command %d", c ); #endif if ( len ) // skip unknown command s.device()->at( s.device()->at()+len ); } #if defined(QT_DEBUG) //qDebug( "device->at(): %i, strm_pos: %i len: %i", s.device()->at(), strm_pos, len ); Q_ASSERT( Q_INT32(s.device()->at() - strm_pos) == len ); #endif } return FALSE; } /*! \internal Records painter commands and stores them in the pictb buffer. */ bool QPicture::cmd( int c, QPainter *pt, QPDevCmdParam *p ) { detach(); return d->cmd( c, pt, p ); } /*! \internal Implementation of the function forwarded above to the internal data struct. */ bool QPicture::QPicturePrivate::cmd( int c, QPainter *pt, QPDevCmdParam *p ) { QDataStream s; s.setDevice( &pictb ); // when moving up to 4 the QDataStream version remained at 3 s.setVersion( formatMajor != 4 ? formatMajor : 3 ); if ( c == PdcBegin ) { // begin; write header QByteArray empty( 0 ); pictb.setBuffer( empty ); // reset byte array in buffer pictb.open( IO_WriteOnly ); s.writeRawBytes( mfhdr_tag, 4 ); s << (Q_UINT16)0 << (Q_UINT16)formatMajor << (Q_UINT16)formatMinor; s << (Q_UINT8)c << (Q_UINT8)sizeof(Q_INT32); brect = QRect(); if ( formatMajor >= 4 ) { s << (Q_INT32)brect.left() << (Q_INT32)brect.top() << (Q_INT32)brect.width() << (Q_INT32)brect.height(); } trecs = 0; s << (Q_UINT32)trecs; // total number of records formatOk = FALSE; return TRUE; } else if ( c == PdcEnd ) { // end; calc checksum and close trecs++; s << (Q_UINT8)c << (Q_UINT8)0; QByteArray buf = pictb.buffer(); int cs_start = sizeof(Q_UINT32); // pos of checksum word int data_start = cs_start + sizeof(Q_UINT16); int brect_start = data_start + 2*sizeof(Q_INT16) + 2*sizeof(Q_UINT8); int pos = pictb.at(); pictb.at( brect_start ); if ( formatMajor >= 4 ) { // bounding rectangle s << (Q_INT32)brect.left() << (Q_INT32)brect.top() << (Q_INT32)brect.width() << (Q_INT32)brect.height(); } s << (Q_UINT32)trecs; // write number of records pictb.at( cs_start ); Q_UINT16 cs = (Q_UINT16)qChecksum( buf.data()+data_start, pos-data_start ); s << cs; // write checksum pictb.close(); return TRUE; } trecs++; s << (Q_UINT8)c; // write cmd to stream s << (Q_UINT8)0; // write dummy length info int pos = (int)pictb.at(); // save position QRect br; // bounding rect addition bool corr = FALSE; // correction for pen width switch ( c ) { case PdcDrawPoint: case PdcMoveTo: case PdcLineTo: case PdcSetBrushOrigin: s << *p[0].point; br = QRect( *p[0].point, QSize( 1, 1 ) ); corr = TRUE; break; case PdcDrawLine: s << *p[0].point << *p[1].point; br = QRect( *p[0].point, *p[1].point ).normalize(); corr = TRUE; break; case PdcDrawRect: case PdcDrawEllipse: s << *p[0].rect; br = *p[0].rect; corr = TRUE; break; case PdcDrawRoundRect: case PdcDrawArc: case PdcDrawPie: case PdcDrawChord: s << *p[0].rect << (Q_INT16)p[1].ival << (Q_INT16)p[2].ival; br = *p[0].rect; corr = TRUE; break; case PdcDrawLineSegments: case PdcDrawPolyline: s << *p[0].ptarr; br = p[0].ptarr->boundingRect(); corr = TRUE; break; #ifndef QT_NO_BEZIER case PdcDrawCubicBezier: s << *p[0].ptarr; br = p[0].ptarr->cubicBezier().boundingRect(); corr = TRUE; break; #endif case PdcDrawPolygon: s << *p[0].ptarr << (Q_INT8)p[1].ival; br = p[0].ptarr->boundingRect(); corr = TRUE; break; case PdcDrawText2: if ( formatMajor == 1 ) { pictb.at( pos - 2 ); s << (Q_UINT8)PdcDrawText << (Q_UINT8)0; QCString str1( (*p[1].str).latin1() ); s << *p[0].point << str1; } else { s << *p[0].point << *p[1].str; } br = pt->fontMetrics().boundingRect( *p[1].str ); br.moveBy( p[0].point->x(), p[0].point->y() ); break; case PdcDrawText2Formatted: if ( formatMajor == 1 ) { pictb.at( pos - 2 ); s << (Q_UINT8)PdcDrawTextFormatted << (Q_UINT8)0; QCString str1( (*p[2].str).latin1() ); s << *p[0].rect << (Q_INT16)p[1].ival << str1; } else { s << *p[0].rect << (Q_INT16)p[1].ival << *p[2].str; } br = *p[0].rect; break; case PdcDrawPixmap: if ( formatMajor < 4 ) { s << *p[0].point; s << *p[1].pixmap; br = QRect( *p[0].point, p[1].pixmap->size() ); } else { s << *p[0].rect; s << *p[1].pixmap; br = *p[0].rect; } break; case PdcDrawImage: if ( formatMajor < 4 ) { QPoint pt( p[0].point->x(), p[0].point->y() ); s << pt; s << *p[1].image; br = QRect( *p[0].point, p[1].image->size() ); } else { s << *p[0].rect; s << *p[1].image; br = *p[0].rect; } break; case PdcSave: case PdcRestore: break; case PdcSetBkColor: s << *p[0].color; break; case PdcSetBkMode: case PdcSetROP: s << (Q_INT8)p[0].ival; break; case PdcSetFont: { QFont fnt = *p[0].font; if (fnt.pointSize() > 0) // we have to store pixels to get correct replay. // the resolution is 72 dpi, so points == pixels fnt.setPixelSize(QFontInfo(fnt).pixelSize()); s << fnt; } break; case PdcSetPen: s << *p[0].pen; break; case PdcSetBrush: s << *p[0].brush; break; case PdcSetTabStops: s << (Q_INT16)p[0].ival; break; case PdcSetTabArray: s << (Q_INT16)p[0].ival; if ( p[0].ival ) { int *ta = p[1].ivec; for ( int i=0; i<p[0].ival; i++ ) s << (Q_INT16)ta[i]; } break; case PdcSetUnit: case PdcSetVXform: case PdcSetWXform: case PdcSetClip: s << (Q_INT8)p[0].ival; break; #ifndef QT_NO_TRANSFORMATIONS case PdcSetWindow: case PdcSetViewport: s << *p[0].rect; break; case PdcSetWMatrix: s << *p[0].matrix << (Q_INT8)p[1].ival; break; #endif case PdcSetClipRegion: s << *p[0].rgn; s << (Q_INT8)p[1].ival; break; #if defined(QT_CHECK_RANGE) default: qWarning( "QPicture::cmd: Command %d not recognized", c ); #endif } int newpos = (int)pictb.at(); // new position int length = newpos - pos; if ( length < 255 ) { // write 8-bit length pictb.at(pos - 1); // position to right index s << (Q_UINT8)length; } else { // write 32-bit length s << (Q_UINT32)0; // extend the buffer pictb.at(pos - 1); // position to right index s << (Q_UINT8)255; // indicate 32-bit length char *p = pictb.buffer().data(); memmove( p+pos+4, p+pos, length ); // make room for 4 byte s << (Q_UINT32)length; newpos += 4; } pictb.at( newpos ); // set to new position if ( br.isValid() ) { if ( corr ) { // widen bounding rect int w2 = pt->pen().width() / 2; br.setCoords( br.left() - w2, br.top() - w2, br.right() + w2, br.bottom() + w2 ); } #ifndef QT_NO_TRANSFORMATIONS br = pt->worldMatrix().map( br ); #endif if ( pt->hasClipping() ) { QRect cr = pt->clipRegion().boundingRect(); br &= cr; } if ( br.isValid() ) brect |= br; // merge with existing rect } return TRUE; } /*! Internal implementation of the virtual QPaintDevice::metric() function. Use the QPaintDeviceMetrics class instead. A picture has the following hard-coded values: dpi=72, numcolors=16777216 and depth=24. \a m is the metric to get. */ int QPicture::metric( int m ) const { int val; switch ( m ) { // ### hard coded dpi and color depth values ! case QPaintDeviceMetrics::PdmWidth: val = d->brect.width(); break; case QPaintDeviceMetrics::PdmHeight: val = d->brect.height(); break; case QPaintDeviceMetrics::PdmWidthMM: val = int(25.4/72.0*d->brect.width()); break; case QPaintDeviceMetrics::PdmHeightMM: val = int(25.4/72.0*d->brect.height()); break; case QPaintDeviceMetrics::PdmDpiX: case QPaintDeviceMetrics::PdmPhysicalDpiX: val = 72; break; case QPaintDeviceMetrics::PdmDpiY: case QPaintDeviceMetrics::PdmPhysicalDpiY: val = 72; break; case QPaintDeviceMetrics::PdmNumColors: val = 16777216; break; case QPaintDeviceMetrics::PdmDepth: val = 24; break; default: val = 0; #if defined(QT_CHECK_RANGE) qWarning( "QPicture::metric: Invalid metric command" ); #endif } return val; } /*! Detaches from shared picture data and makes sure that this picture is the only one referring to the data. If multiple pictures share common data, this picture makes a copy of the data and detaches itself from the sharing mechanism. Nothing is done if there is just a single reference. */ void QPicture::detach() { if ( d->count != 1 ) *this = copy(); } /*! Returns a \link shclass.html deep copy\endlink of the picture. */ QPicture QPicture::copy() const { QPicture p; QByteArray a( size() ); memcpy( a.data(), data(), size() ); p.d->pictb.setBuffer( a ); // set byte array in buffer if ( d->pictb.isOpen() ) { // copy buffer state p.d->pictb.open( d->pictb.mode() ); p.d->pictb.at( d->pictb.at() ); } p.d->trecs = d->trecs; p.d->formatOk = d->formatOk; p.d->formatMinor = d->formatMajor; p.d->brect = boundingRect(); return p; } /***************************************************************************** QPainter member functions *****************************************************************************/ /*! Replays the picture \a pic translated by (\a x, \a y). This function does exactly the same as QPicture::play() when called with (\a x, \a y) = (0, 0). */ void QPainter::drawPicture( int x, int y, const QPicture &pic ) { save(); translate( x, y ); ((QPicture*)&pic)->play( (QPainter*)this ); restore(); } /*! \overload void QPainter::drawPicture( const QPoint &p, const QPicture &pic ) Draws picture \a pic at point \a p. */ void QPainter::drawPicture( const QPoint &p, const QPicture &pic ) { drawPicture( p.x(), p.y(), pic ); } /*! \obsolete Use one of the other QPainter::drawPicture() functions with a (0, 0) offset instead. */ void QPainter::drawPicture( const QPicture &pic ) { drawPicture( 0, 0, pic ); } /*! Assigns a \link shclass.html shallow copy\endlink of \a p to this picture and returns a reference to this picture. */ QPicture& QPicture::operator= (const QPicture& p) { p.d->ref(); // avoid 'x = x' if ( d->deref() ) delete d; d = p.d; return *this; } /*! \internal Sets formatOk to FALSE and resets the format version numbers to default */ void QPicture::QPicturePrivate::resetFormat() { formatOk = FALSE; formatMajor = mfhdr_maj; formatMinor = mfhdr_min; } /*! \internal Checks data integrity and format version number. Set formatOk to TRUE on success, to FALSE otherwise. Returns the resulting formatOk value. */ bool QPicture::QPicturePrivate::checkFormat() { resetFormat(); // can't check anything in an empty buffer if ( pictb.size() == 0 ) return FALSE; pictb.open( IO_ReadOnly ); // open buffer device QDataStream s; s.setDevice( &pictb ); // attach data stream to buffer char mf_id[4]; // picture header tag s.readRawBytes( mf_id, 4 ); // read actual tag if ( memcmp(mf_id, mfhdr_tag, 4) != 0 ) { // wrong header id #if defined(QT_CHECK_RANGE) qWarning( "QPicture::checkFormat: Incorrect header" ); #endif pictb.close(); return FALSE; } int cs_start = sizeof(Q_UINT32); // pos of checksum word int data_start = cs_start + sizeof(Q_UINT16); Q_UINT16 cs,ccs; QByteArray buf = pictb.buffer(); // pointer to data s >> cs; // read checksum ccs = qChecksum( buf.data() + data_start, buf.size() - data_start ); if ( ccs != cs ) { #if defined(QT_CHECK_STATE) qWarning( "QPicture::checkFormat: Invalid checksum %x, %x expected", ccs, cs ); #endif pictb.close(); return FALSE; } Q_UINT16 major, minor; s >> major >> minor; // read version number if ( major > mfhdr_maj ) { // new, incompatible version #if defined(QT_CHECK_RANGE) qWarning( "QPicture::checkFormat: Incompatible version %d.%d", major, minor); #endif pictb.close(); return FALSE; } s.setVersion( major != 4 ? major : 3 ); Q_UINT8 c, clen; s >> c >> clen; if ( c == PdcBegin ) { if ( !( major >= 1 && major <= 3 )) { Q_INT32 l, t, w, h; s >> l >> t >> w >> h; brect = QRect( l, t, w, h ); } } else { #if defined(QT_CHECK_RANGE) qWarning( "QPicture::checkFormat: Format error" ); #endif pictb.close(); return FALSE; } pictb.close(); formatOk = TRUE; // picture seems to be ok formatMajor = major; formatMinor = minor; return TRUE; } /***************************************************************************** QPicture stream functions *****************************************************************************/ /*! \relates QPicture Writes picture \a r to the stream \a s and returns a reference to the stream. */ QDataStream &operator<<( QDataStream &s, const QPicture &r ) { Q_UINT32 size = r.d->pictb.buffer().size(); s << size; // null picture ? if ( size == 0 ) return s; // just write the whole buffer to the stream return s.writeRawBytes ( r.d->pictb.buffer().data(), r.d->pictb.buffer().size() ); } /*! \relates QPicture Reads a picture from the stream \a s into picture \a r and returns a reference to the stream. */ QDataStream &operator>>( QDataStream &s, QPicture &r ) { QDataStream sr; // "init"; this code is similar to the beginning of QPicture::cmd() sr.setDevice( &r.d->pictb ); sr.setVersion( r.d->formatMajor ); Q_UINT32 len; s >> len; QByteArray data( len ); if ( len > 0 ) s.readRawBytes( data.data(), len ); r.d->pictb.setBuffer( data ); r.d->resetFormat(); return s; } #endif // QT_NO_PICTURE