/****************************************************************************
**
** Implementation of some internal classes
**
** Created : 010427
**
** 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:
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** or contact the sales department at sales@trolltech.com.
**
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** 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.
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
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**********************************************************************/
#include "private/qinternal_p.h"
#include "qwidget.h"
#include "qpixmap.h"
#include "qpainter.h"
#include "qcleanuphandler.h"
// Modern systems (year 2011) have very large screens in excess of 1000 pixels wide
// Some may even have screens in excess of 4000 pixels wide(!)
// Prevent drawing artifacts on such screens
#define USE_HUGE_QT_SHARED_DOUBLE_BUFFERS 1
static QPixmap* qdb_shared_pixmap = 0;
static QPixmap *qdb_force_pixmap = 0;
static QSharedDoubleBuffer* qdb_owner = 0;
QCleanupHandler<QPixmap> qdb_pixmap_cleanup;
#ifdef Q_WS_MACX
bool QSharedDoubleBuffer::dblbufr = FALSE;
#else
bool QSharedDoubleBuffer::dblbufr = TRUE;
#endif
/*
hardLimitWidth/Height: if >= 0, the maximum number of pixels that
get double buffered.
sharedLimitWidth/Height: if >= 0, the maximum number of pixels the
shared double buffer can keep.
For x with sharedLimitSize < x <= hardLimitSize, temporary buffers
are constructed.
*/
static const int hardLimitWidth = -1;
static const int hardLimitHeight = -1;
#if defined( Q_WS_QWS ) || defined( Q_WS_MAC9 )
// Small in Qt/Embedded / Mac9 - 5K on 32bpp
static const int sharedLimitWidth = 64;
static const int sharedLimitHeight = 20;
#else
#ifdef USE_HUGE_QT_SHARED_DOUBLE_BUFFERS
// 24M on 32bpp
static const int sharedLimitWidth = 6400;
static const int sharedLimitHeight = 1000;
#else
// 240K on 32bpp
static const int sharedLimitWidth = 640;
static const int sharedLimitHeight = 100;
#endif
#endif
// *******************************************************************
// QSharedDoubleBufferCleaner declaration and implementation
// *******************************************************************
/* \internal
This class is responsible for cleaning up the pixmaps created by the
QSharedDoubleBuffer class. When QSharedDoubleBuffer creates a
pixmap larger than the shared limits, this class deletes it after a
specified amount of time.
When the large pixmap is created/used, you must call start(). If the
large pixmap is ever deleted, you must call stop(). The start()
method always restarts the timer, so if the large pixmap is
constantly in use, the timer will never fire, and the pixmap will
not be constantly created and destroyed.
*/
static const int shared_double_buffer_cleanup_timeout = 30000; // 30 seconds
// declaration
class QSharedDoubleBufferCleaner : public QObject
{
public:
QSharedDoubleBufferCleaner( void );
void start( void );
void stop( void );
void doCleanup( void );
bool event( QEvent *e );
private:
int timer_id;
};
// implementation
/* \internal
Creates a QSharedDoubleBufferCleaner object. The timer is not
started when creating the object.
*/
QSharedDoubleBufferCleaner::QSharedDoubleBufferCleaner( void )
: QObject( 0, "internal shared double buffer cleanup object" ),
timer_id( -1 )
{
}
/* \internal
Starts the cleanup timer. Any previously running timer is stopped.
*/
void QSharedDoubleBufferCleaner::start( void )
{
stop();
timer_id = startTimer( shared_double_buffer_cleanup_timeout );
}
/* \internal
Stops the cleanup timer, if it is running.
*/
void QSharedDoubleBufferCleaner::stop( void )
{
if ( timer_id != -1 )
killTimer( timer_id );
timer_id = -1;
}
/* \internal
*/
void QSharedDoubleBufferCleaner::doCleanup( void )
{
qdb_pixmap_cleanup.remove( &qdb_force_pixmap );
delete qdb_force_pixmap;
qdb_force_pixmap = 0;
}
/* \internal
Event handler reimplementation. Calls doCleanup() when the timer
fires.
*/
bool QSharedDoubleBufferCleaner::event( QEvent *e )
{
if ( e->type() != QEvent::Timer )
return FALSE;
QTimerEvent *event = (QTimerEvent *) e;
if ( event->timerId() == timer_id ) {
doCleanup();
stop();
}
#ifdef QT_CHECK_STATE
else {
tqWarning( "QSharedDoubleBufferCleaner::event: invalid timer event received." );
return FALSE;
}
#endif // QT_CHECK_STATE
return TRUE;
}
// static instance
static QSharedDoubleBufferCleaner *static_cleaner = 0;
QSingleCleanupHandler<QSharedDoubleBufferCleaner> cleanup_static_cleaner;
inline static QSharedDoubleBufferCleaner *staticCleaner()
{
if ( ! static_cleaner ) {
static_cleaner = new QSharedDoubleBufferCleaner();
cleanup_static_cleaner.set( &static_cleaner );
}
return static_cleaner;
}
// *******************************************************************
// QSharedDoubleBuffer implementation
// *******************************************************************
/* \internal
\enum DoubleBufferFlags
\value InitBG initialize the background of the double buffer.
\value Force disable shared buffer size limits.
\value Default InitBG and Force are used by default.
*/
/* \internal
\enum DoubleBufferState
\value Active indicates that the buffer may be used.
\value BufferActive indicates that painting with painter() will be
double buffered.
\value ExternalPainter indicates that painter() will return a
painter that was not created by QSharedDoubleBuffer.
*/
/* \internal
\class QSharedDoubleBuffer
This class provides a single, reusable double buffer. This class
is used internally by Qt widgets that need double buffering, which
prevents each individual widget form creating a double buffering
pixmap.
Using a single pixmap double buffer and sharing it across all
widgets is nicer on window system resources.
*/
/* \internal
Creates a QSharedDoubleBuffer with flags \f.
\sa DoubleBufferFlags
*/
QSharedDoubleBuffer::QSharedDoubleBuffer( DBFlags f )
: wid( 0 ), rx( 0 ), ry( 0 ), rw( 0 ), rh( 0 ), flags( f ), state( 0 ),
p( 0 ), external_p( 0 ), pix( 0 )
{
}
/* \internal
Creates a QSharedDoubleBuffer with flags \f. The \a widget, \a x,
\a y, \a w and \a h arguments are passed to begin().
\sa DoubleBufferFlags begin()
*/
QSharedDoubleBuffer::QSharedDoubleBuffer( QWidget* widget,
int x, int y, int w, int h,
DBFlags f )
: wid( 0 ), rx( 0 ), ry( 0 ), rw( 0 ), rh( 0 ), flags( f ), state( 0 ),
p( 0 ), external_p( 0 ), pix( 0 )
{
begin( widget, x, y, w, h );
}
/* \internal
Creates a QSharedDoubleBuffer with flags \f. The \a painter, \a x,
\a y, \a w and \a h arguments are passed to begin().
\sa DoubleBufferFlags begin()
*/
QSharedDoubleBuffer::QSharedDoubleBuffer( QPainter* painter,
int x, int y, int w, int h,
DBFlags f)
: wid( 0 ), rx( 0 ), ry( 0 ), rw( 0 ), rh( 0 ), flags( f ), state( 0 ),
p( 0 ), external_p( 0 ), pix( 0 )
{
begin( painter, x, y, w, h );
}
/* \internal
Creates a QSharedDoubleBuffer with flags \f. The \a widget and
\a r arguments are passed to begin().
\sa DoubleBufferFlags begin()
*/
QSharedDoubleBuffer::QSharedDoubleBuffer( QWidget *widget, const QRect &r, DBFlags f )
: wid( 0 ), rx( 0 ), ry( 0 ), rw( 0 ), rh( 0 ), flags( f ), state( 0 ),
p( 0 ), external_p( 0 ), pix( 0 )
{
begin( widget, r );
}
/* \internal
Creates a QSharedDoubleBuffer with flags \f. The \a painter and
\a r arguments are passed to begin().
\sa DoubleBufferFlags begin()
*/
QSharedDoubleBuffer::QSharedDoubleBuffer( QPainter *painter, const QRect &r, DBFlags f )
: wid( 0 ), rx( 0 ), ry( 0 ), rw( 0 ), rh( 0 ), flags( f ), state( 0 ),
p( 0 ), external_p( 0 ), pix( 0 )
{
begin( painter, r );
}
/* \internal
Destructs the QSharedDoubleBuffer and calls end() if the buffer is
active.
\sa isActive() end()
*/
QSharedDoubleBuffer::~QSharedDoubleBuffer()
{
if ( isActive() )
end();
}
/* \internal
Starts double buffered painting in the area specified by \a x,
\a y, \a w and \a h on \a painter. Painting should be done using the
QPainter returned by QSharedDoubleBuffer::painter().
The double buffered area will be updated when calling end().
\sa painter() isActive() end()
*/
bool QSharedDoubleBuffer::begin( QPainter* painter, int x, int y, int w, int h )
{
if ( isActive() ) {
#if defined(QT_CHECK_STATE)
tqWarning( "QSharedDoubleBuffer::begin: Buffer is already active."
"\n\tYou must end() the buffer before a second begin()" );
#endif // QT_CHECK_STATE
return FALSE;
}
external_p = painter;
if ( painter->device()->devType() == QInternal::Widget )
return begin( (QWidget *) painter->device(), x, y, w, h );
state = Active;
rx = x;
ry = y;
rw = w;
rh = h;
if ( ( pix = getPixmap() ) ) {
#ifdef Q_WS_X11
if ( painter->device()->x11Screen() != pix->x11Screen() )
pix->x11SetScreen( painter->device()->x11Screen() );
QPixmap::x11SetDefaultScreen( pix->x11Screen() );
#endif // Q_WS_X11
state |= BufferActive;
p = new QPainter( pix );
if ( p->isActive() ) {
p->setPen( external_p->pen() );
p->setBackgroundColor( external_p->backgroundColor() );
p->setFont( external_p->font() );
}
} else {
state |= ExternalPainter;
p = external_p;
}
return TRUE;
}
/* \internal
Starts double buffered painting in the area specified by \a x,
\a y, \a w and \a h on \a widget. Painting should be done using the
QPainter returned by QSharedDoubleBuffer::painter().
The double buffered area will be updated when calling end().
\sa painter() isActive() end()
*/
bool QSharedDoubleBuffer::begin( QWidget* widget, int x, int y, int w, int h )
{
if ( isActive() ) {
#if defined(QT_CHECK_STATE)
tqWarning( "QSharedDoubleBuffer::begin: Buffer is already active."
"\n\tYou must end() the buffer before a second begin()" );
#endif // QT_CHECK_STATE
return FALSE;
}
state = Active;
wid = widget;
rx = x;
ry = y;
rw = w <= 0 ? wid->width() : w;
rh = h <= 0 ? wid->height() : h;
if ( ( pix = getPixmap() ) ) {
#ifdef Q_WS_X11
if ( wid->x11Screen() != pix->x11Screen() )
pix->x11SetScreen( wid->x11Screen() );
QPixmap::x11SetDefaultScreen( pix->x11Screen() );
#endif // Q_WS_X11
state |= BufferActive;
if ( flags & InitBG ) {
pix->fill( wid, rx, ry );
}
p = new QPainter( pix, wid );
// newly created painters should be translated to the origin
// of the widget, so that paint methods can draw onto the double
// buffered painter in widget coordinates.
p->setBrushOrigin( -rx, -ry );
p->translate( -rx, -ry );
} else {
if ( external_p ) {
state |= ExternalPainter;
p = external_p;
} else {
p = new QPainter( wid );
}
if ( flags & InitBG ) {
wid->erase( rx, ry, rw, rh );
}
}
return TRUE;
}
/* \internal
Ends double buffered painting. The contents of the shared double
buffer pixmap are drawn onto the destination by calling flush(),
and ownership of the shared double buffer pixmap is released.
\sa begin() flush()
*/
bool QSharedDoubleBuffer::end()
{
if ( ! isActive() ) {
#if defined(QT_CHECK_STATE)
tqWarning( "QSharedDoubleBuffer::end: Buffer is not active."
"\n\tYou must call begin() before calling end()." );
#endif // QT_CHECK_STATE
return FALSE;
}
if ( ! ( state & ExternalPainter ) ) {
p->end();
delete p;
}
flush();
if ( pix ) {
releasePixmap();
}
wid = 0;
rx = ry = rw = rh = 0;
// do not reset flags!
state = 0;
p = external_p = 0;
pix = 0;
return TRUE;
}
/* \internal
Paints the contents of the shared double buffer pixmap onto the
destination. The destination is determined from the arguments
based to begin().
Note: You should not need to call this function, since it is called
from end().
\sa begin() end()
*/
void QSharedDoubleBuffer::flush()
{
if ( ! isActive() || ! ( state & BufferActive ) )
return;
if ( external_p )
external_p->drawPixmap( rx, ry, *pix, 0, 0, rw, rh );
else if ( wid && wid->isVisible() )
bitBlt( wid, rx, ry, pix, 0, 0, rw, rh );
}
/* \internal
Aquire ownership of the shared double buffer pixmap, subject to the
following conditions:
\list 1
\i double buffering is enabled globally.
\i the shared double buffer pixmap is not in use.
\i the size specified in begin() is valid, and within limits.
\endlist
If all of these conditions are met, then this QSharedDoubleBuffer
object becomes the owner of the shared double buffer pixmap. The
shared double buffer pixmap is resize if necessary, and this
function returns a pointer to the pixmap. Ownership must later be
relinquished by calling releasePixmap().
If none of the above conditions are met, this function returns
zero.
\sa releasePixmap()
*/
QPixmap *QSharedDoubleBuffer::getPixmap()
{
if ( isDisabled() ) {
// double buffering disabled globally
return 0;
}
if ( qdb_owner ) {
// shared pixmap already in use
return 0;
}
if ( rw <= 0 || rh <= 0 ||
( hardLimitWidth > 0 && rw >= hardLimitWidth ) ||
( hardLimitHeight > 0 && rh >= hardLimitHeight ) ) {
// invalid size, or hard limit reached
return 0;
}
if ( rw >= sharedLimitWidth || rh >= sharedLimitHeight ) {
if ( flags & Force ) {
#ifdef USE_HUGE_QT_SHARED_DOUBLE_BUFFERS
rw = QMIN(rw, 16000);
rh = QMIN(rh, 16000);
#else
rw = QMIN(rw, 8000);
rh = QMIN(rh, 8000);
#endif
// need to create a big pixmap and start the cleaner
if ( ! qdb_force_pixmap ) {
qdb_force_pixmap = new QPixmap( rw, rh );
qdb_pixmap_cleanup.add( &qdb_force_pixmap );
} else if ( qdb_force_pixmap->width () < rw ||
qdb_force_pixmap->height() < rh ) {
qdb_force_pixmap->resize( rw, rh );
}
qdb_owner = this;
staticCleaner()->start();
return qdb_force_pixmap;
}
// size is outside shared limit
return 0;
}
if ( ! qdb_shared_pixmap ) {
qdb_shared_pixmap = new QPixmap( rw, rh );
qdb_pixmap_cleanup.add( &qdb_shared_pixmap );
} else if ( qdb_shared_pixmap->width() < rw ||
qdb_shared_pixmap->height() < rh ) {
qdb_shared_pixmap->resize( rw, rh );
}
qdb_owner = this;
return qdb_shared_pixmap;
}
/* \internal
Releases ownership of the shared double buffer pixmap.
\sa getPixmap()
*/
void QSharedDoubleBuffer::releasePixmap()
{
if ( qdb_owner != this ) {
// sanity check
#ifdef QT_CHECK_STATE
tqWarning( "QSharedDoubleBuffer::releasePixmap: internal error."
"\n\t%p does not own shared pixmap, %p does.",
(void*)this, (void*)qdb_owner );
#endif // QT_CHECK_STATE
return;
}
qdb_owner = 0;
}
/* \internal
\fn bool QSharedDoubleBuffer::isDisabled()
Returns TRUE if double buffering is disabled globally, FALSE otherwise.
*/
/* \internal
\fn void QSharedDoubleBuffer::setDisabled( bool off )
Disables global double buffering \a off is TRUE, otherwise global
double buffering is enabled.
*/
/* \internal
Deletes the shared double buffer pixmap. You should not need to
call this function, since it is called from the QApplication
destructor.
*/
void QSharedDoubleBuffer::cleanup()
{
qdb_pixmap_cleanup.remove( &qdb_shared_pixmap );
qdb_pixmap_cleanup.remove( &qdb_force_pixmap );
delete qdb_shared_pixmap;
delete qdb_force_pixmap;
qdb_shared_pixmap = 0;
qdb_force_pixmap = 0;
qdb_owner = 0;
}
/* \internal
\fn bool QSharedDoubleBuffer::begin( QWidget *widget, const QRect &r )
\overload
*/
/* \internal
\fn bool QSharedDoubleBuffer::begin( QPainter *painter, const QRect &r )
\overload
*/
/* \internal
\fn QPainter *QSharedDoubleBuffer::painter() const
Returns the active painter on the double buffered area,
or zero if double buffered painting is not active.
*/
/* \internal
\fn bool QSharedDoubleBuffer::isActive() const
Returns TRUE if double buffered painting is active, FALSE otherwise.
*/
/* \internal
\fn bool QSharedDoubleBuffer::isBuffered() const
Returns TRUE if painting is double buffered, FALSE otherwise.
*/
// *******************************************************************
// QMembuf declaration and implementation
// *******************************************************************
/* \internal
This class implements an efficient buffering of data that is often used by
asynchronous IO classes like QSocket, QHttp and QProcess.
*/
QMembuf::QMembuf() : _size(0), _index(0)
{
buf = new QPtrList<QByteArray>;
buf->setAutoDelete( TRUE );
}
QMembuf::~QMembuf()
{
delete buf;
}
/*! \internal
This function consumes \a nbytes bytes of data from the
buffer and copies it into \a sink. If \a sink is a 0 pointer
the data goes into the nirvana.
*/
bool QMembuf::consumeBytes( Q_ULONG nbytes, char *sink )
{
if ( nbytes <= 0 || nbytes > _size )
return FALSE;
_size -= nbytes;
for ( ;; ) {
QByteArray *a = buf->first();
if ( _index + nbytes >= a->size() ) {
// Here we skip the whole byte array and get the next later
int len = a->size() - _index;
if ( sink ) {
memcpy( sink, a->data()+_index, len );
sink += len;
}
nbytes -= len;
buf->remove();
_index = 0;
if ( nbytes == 0 )
break;
} else {
// Here we skip only a part of the first byte array
if ( sink )
memcpy( sink, a->data()+_index, nbytes );
_index += nbytes;
break;
}
}
return TRUE;
}
/*! \internal
Scans for any occurrence of '\n' in the buffer. If \a store
is not 0 the text up to the first '\n' (or terminating 0) is
written to \a store, and a terminating 0 is appended to \a store
if necessary. Returns TRUE if a '\n' was found; otherwise returns
FALSE.
*/
bool QMembuf::scanNewline( QByteArray *store )
{
if ( _size == 0 )
return FALSE;
int i = 0; // index into 'store'
QByteArray *a = 0;
char *p;
int n;
for ( ;; ) {
if ( !a ) {
a = buf->first();
if ( !a || a->size() == 0 )
return FALSE;
p = a->data() + _index;
n = a->size() - _index;
} else {
a = buf->next();
if ( !a || a->size() == 0 )
return FALSE;
p = a->data();
n = a->size();
}
if ( store ) {
while ( n-- > 0 ) {
*(store->data()+i) = *p;
if ( ++i == (int)store->size() )
store->resize( store->size() < 256
? 1024 : store->size()*4 );
switch ( *p ) {
case '\0':
store->resize( i );
return FALSE;
case '\n':
*(store->data()+i) = '\0';
store->resize( i );
return TRUE;
}
p++;
}
} else {
while ( n-- > 0 ) {
switch ( *p++ ) {
case '\0':
return FALSE;
case '\n':
return TRUE;
}
}
}
}
}
int QMembuf::ungetch( int ch )
{
if ( buf->isEmpty() || _index==0 ) {
// we need a new QByteArray
QByteArray *ba = new QByteArray( 1 );
buf->insert( 0, ba );
_size++;
ba->at( 0 ) = ch;
} else {
// we can reuse a place in the buffer
QByteArray *ba = buf->first();
_index--;
_size++;
ba->at( _index ) = ch;
}
return ch;
}