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qt3/src/kernel/qpicture.cpp

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/****************************************************************************
**
** 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