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Diffstat (limited to 'src/kernel/qpicture.cpp')
| -rw-r--r-- | src/kernel/qpicture.cpp | 1229 |
1 files changed, 1229 insertions, 0 deletions
diff --git a/src/kernel/qpicture.cpp b/src/kernel/qpicture.cpp new file mode 100644 index 0000000..d434516 --- /dev/null +++ b/src/kernel/qpicture.cpp @@ -0,0 +1,1229 @@ +/**************************************************************************** +** +** 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 + |