QDirectPainter Class Reference

The QDirectPainter class provides direct access to the underlying hardware in Qt for Embedded Linux. More...

#include <qdirectpainter_qws.h>

Inheritance diagram for QDirectPainter:

Public Types
enum	SurfaceFlag { NonReserved = 0, Reserved = 1, ReservedSynchronous = 3 }
	This enum describes the behavior of the region reserved by this QDirectPainter object. More...

Public Functions
QRegion	allocatedRegion () const
	Returns the currently reserved region. More...
void	endPainting ()
	Call this function when you are done updating the screen. More...
void	endPainting (const QRegion &region)
	This function will automatically call flush() to flush the region to the display before notifying the hardware, if necessary, that painting operations have ended. More...
void	flush (const QRegion &region)
	Flushes the region onto the screen. More...
QRect	geometry () const
	Returns the bounding rectangle of the requested region. More...
void	lower ()
	Lowers the reserved region to the bottom of the widget stack. More...
	QDirectPainter (QObject *parentObject=0, SurfaceFlag flag=NonReserved)
	Constructs a QDirectPainter object with the given parent and surface flag. More...
void	raise ()
	Raises the reserved region to the top of the widget stack. More...
virtual void	regionChanged (const QRegion &exposedRegion)
	This function is called when the allocated region changes. More...
QRegion	requestedRegion () const
	Returns the region requested by this QDirectPainter. More...
void	setGeometry (const QRect &)
	Request to reserve the given rectangle of the framebuffer. More...
void	setRegion (const QRegion &)
	Requests to reserve the given region of the framebuffer. More...
void	startPainting (bool lockDisplay=true)
	Call this function before you start updating the pixels in the allocated region. More...
WId	winId () const
	Returns the window system identifier of the widget. More...
	~QDirectPainter ()
	Destroys this QDirectPainter object, releasing the reserved region. More...
Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...
const QObjectList &	children () const
	Returns a list of child objects. More...
bool	connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0)
bool	disconnect (const QObject *receiver, const char *member=0)
void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...
void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...
QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...
virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...
virtual bool	eventFilter (QObject *, QEvent *)
	Filters events if this object has been installed as an event filter for the watched object. More...
template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...
template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...
template<typename T >
QList< T >	findChildren (const QRegExp &re) const
bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...
void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...
bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...
void	killTimer (int id)
	Kills the timer with timer identifier, id. More...
virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...
void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...
QString	objectName () const
QObject *	parent () const
	Returns a pointer to the parent object. More...
QVariant	property (const char *name) const
	Returns the value of the object's name property. More...
Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...
void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...
void	setObjectName (const QString &name)
void	setParent (QObject *)
	Makes the object a child of parent. More...
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...
void	setUserData (uint id, QObjectUserData *data)
bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...
int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...
QThread *	thread () const
	Returns the thread in which the object lives. More...
QObjectUserData *	userData (uint id) const
virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Static Public Functions
static uchar *	frameBuffer ()
	Returns a pointer to the beginning of the display memory. More...
static int	linestep ()
	Returns the length (in bytes) of each scanline of the framebuffer. More...
static void	lock ()
	Locks access to the framebuffer. More...
static QRegion	region ()
	Use QDirectPainter::allocatedRegion() instead. More...
static QRegion	reservedRegion ()
	Returns the reserved region. More...
static QRegion	reserveRegion (const QRegion &)
	Attempts to reserve the region and returns the region that is actually reserved. More...
static int	screenDepth ()
	Returns the bit depth of the display. More...
static int	screenHeight ()
	Returns the height of the display in pixels. More...
static int	screenWidth ()
	Returns the width of the display in pixels. More...
static void	unlock ()
	Unlocks the lock on the framebuffer (set using the lock() function), allowing other applications to access the screen. More...
Static Public Functions inherited from QObject
static bool	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...
static bool	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
static bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
	Disconnects signal in object sender from method in object receiver. More...
static bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
static uint	registerUserData ()
static QString	tr (const char *sourceText, const char *comment=0, int n=-1)
static QString	trUtf8 (const char *sourceText, const char *comment=0, int n=-1)

Friends
void	qt_directpainter_embedevent (QDirectPainter *, const QWSEmbedEvent *)
void	qt_directpainter_region (QDirectPainter *dp, const QRegion &alloc, int type)

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...
Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...
Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...
Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...
virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...
virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...
virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...
	QObject (QObjectPrivate &dd, QObject *parent=0)
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...
int	senderSignalIndex () const
virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...
Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr
Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject
Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()
T *	qobject_cast (QObject *object)
	QObjectList
void *	qt_find_obj_child (QObject *parent, const char *type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

The QDirectPainter class provides direct access to the underlying hardware in Qt for Embedded Linux.

Note that this class is only available in Qt for Embedded Linux.

QDirectPainter allows a client application to reserve a region of the framebuffer and render directly onto the screen. There are two ways of using the QDirectPainter class: You can either reserve a region using the provided static functions, or you can instantiate an object and make use of its more dynamic API.

Dynamic Allocation

By instantiating a QDirectPainter object using the default QDirectPainter::NonReserved surface flag, the client application only gets some control over the reserved region, i.e., it can still render directly onto the screen but the allocated region may change (for example, if a window with a higher focus requests parts of the same region). The currently allocated region can be retrieved using the allocatedRegion() function, while the requestedRegion() function returns the originally reserved region.

Static Allocation

Using the static approach, the client application gets complete control over the reserved region, i.e., the affected region will never be modified by the screen driver.

To create a static region, pass the QDirectPainter::Reserved surface flag to the constructor. After the reserved region is reported through regionChanged(), the allocated region will not change, unless setRegion() is called.

If QDirectPainter::ReservedSynchronous is passed to the constructor, calls to setRegion() will block until the region is reserved, meaning that allocatedRegion() will be available immediately. Note that in the current version setRegion() will cause the application event loop to be entered, potentially causing reentrancy issues.

Rendering

To draw on a given region, the application must first get hold of a pointer to the framebuffer. In most cases, this pointer can be retrieved using the QDirectPainter::frameBuffer() function. But note that if the current screen has subscreens, you must query the screen driver instead to identify the correct subscreen. A pointer to the current screen driver can always be retrieved using the static QScreen::instance() function. Then use QScreen's QScreen::subScreenIndexAt() and QScreen::subScreens() functions to access the correct subscreen, and the subscreen's QScreen::base() function to retrieve a pointer to the framebuffer.

Depending on the hardware, it might be necessary to lock the framebuffer for exclusive use while writing to it. This is possible using the lock() and unlock() functions. Note that calling lock() will prevent all other applications from working until unlock() is called.

In addition, QDirectPainter provides several functions returning information about the framebuffer: the linestep() function returns the length (in bytes) of each scanline of the framebuffer while the screenDepth(), screenWidth() and screenHeight() function return the screen metrics.

See also

QScreen, QWSEmbedWidget, {Qt for Embedded Linux Architecture}

Definition at line 58 of file qdirectpainter_qws.h.

Enumerations

SurfaceFlag

enum QDirectPainter::SurfaceFlag

This enum describes the behavior of the region reserved by this QDirectPainter object.

• NonReserved The allocated region may change, e.g., if a window with a higher focus requests parts of the same region. See also Dynamic Allocation.

• Reserved The allocated region will never change. See also Static Allocation.

• ReservedSynchronous The allocated region will never change and each function that changes the allocated region will be blocking.

See also

allocatedRegion()

Enumerator
NonReserved
Reserved
ReservedSynchronous

Definition at line 63 of file qdirectpainter_qws.h.

                     { NonReserved = 0,
                       Reserved = 1,
                       ReservedSynchronous = 3 };

Constructors and Destructors

QDirectPainter()

QDirectPainter::QDirectPainter ( QObject *  parentObject = 0, SurfaceFlag  flag = NonReserved  )

explicit

Constructs a QDirectPainter object with the given parent and surface flag.

Definition at line 262 of file qdirectpainter_qws.cpp.

Referenced by reserveRegion().

    :QObject(*new QDirectPainterPrivate, parent)
{
    Q_D(QDirectPainter);
    d->surface = new QWSDirectPainterSurface(true, flag);

    if (flag != NonReserved)
        d->surface->setReserved();

    QApplicationPrivate *ad = qApp->d_func();
    if (!ad->directPainters)
        ad->directPainters = new QMap<WId, QDirectPainter*>;
    ad->directPainters->insert(d->surface->windowId(), this);
}

~QDirectPainter()

QDirectPainter::~QDirectPainter

(

)

Destroys this QDirectPainter object, releasing the reserved region.

See also

allocatedRegion()

Definition at line 282 of file qdirectpainter_qws.cpp.

{
    /* should not be necessary
    if (this == QDirectPainterPrivate::staticPainter)
        QDirectPainterPrivate::staticPainter = 0;
    */
}

Functions

allocatedRegion()

QRegion QDirectPainter::allocatedRegion

(

)

const

Returns the currently reserved region.

Since

4.2

Note that if the QDirectPainter::Reserved flag is set, the region returned by this function will always be equivalent to the region returned by the requestedRegion() function. Otherwise they might differ (see Dynamic Allocation for details).

See also

requestedRegion(), geometry()

Definition at line 391 of file qdirectpainter_qws.cpp.

Referenced by reservedRegion(), and reserveRegion().

{
    Q_D(const QDirectPainter);
    const QScreen *screen = d->surface->screen();
    if (screen->isTransformed()) {
        const QSize screenSize(screen->width(), screen->height());
        return screen->mapToDevice(d->surface->region(), screenSize);
    } else {
        return d->surface->region();
    }
}

endPainting() [1/2]

void QDirectPainter::endPainting

(

)

Call this function when you are done updating the screen.

Since

4.2

It will notify the hardware, if necessary, that your painting operations have ended.

Definition at line 489 of file qdirectpainter_qws.cpp.

Referenced by endPainting().

{
    Q_D(QDirectPainter);

    const QScreen *screen = d->surface->screen();
    if (screen->isTransformed()) {
        const QSize devSize(screen->deviceWidth(), screen->deviceHeight());
        const QRegion r = screen->mapFromDevice(d->surface->region(), devSize);
        d->surface->endPaint(r);
    } else {
        d->surface->endPaint(d->surface->region());
    }
}

endPainting() [2/2]

void QDirectPainter::endPainting

(

const QRegion &

region

)

This function will automatically call flush() to flush the region to the display before notifying the hardware, if necessary, that painting operations have ended.

Since

4.3 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Definition at line 514 of file qdirectpainter_qws.cpp.

{
    endPainting();
    flush(region);
}

flush()

void QDirectPainter::flush

(

const QRegion &

region

)

Flushes the region onto the screen.

Since

4.3

Definition at line 528 of file qdirectpainter_qws.cpp.

Referenced by endPainting().

{
    Q_D(QDirectPainter);

    const QScreen *screen = d->surface->screen();
    if (screen->isTransformed()) {
        const QSize devSize(screen->deviceWidth(), screen->deviceHeight());
        const QRegion r = screen->mapFromDevice(region, devSize);
        d->surface->flush(0, r, QPoint());
    } else {
        d->surface->flush(0, region, QPoint());
    }
}

frameBuffer()

uchar * QDirectPainter::frameBuffer ( )

static

Returns a pointer to the beginning of the display memory.

Note that it is the application's responsibility to limit itself to modifying only the reserved region.

Do not use this pointer if the current screen has subscreens, query the screen driver instead: A pointer to the current screen driver can always be retrieved using the static QScreen::instance() function. Then use QScreen's QScreen::subScreenIndexAt() and QScreen::subScreens() functions to access the correct subscreen, and the subscreen's QScreen::base() function to retrieve a pointer to the framebuffer.

See also

requestedRegion(), allocatedRegion(), linestep()

Definition at line 624 of file qdirectpainter_qws.cpp.

{
    QScreen *screen = getPrimaryScreen();
    if (!screen)
        return 0;
    return screen->base();
}

geometry()

QRect QDirectPainter::geometry

(

)

const

Returns the bounding rectangle of the requested region.

Since

4.2

See also

setGeometry(), requestedRegion()

Definition at line 320 of file qdirectpainter_qws.cpp.

{
    Q_D(const QDirectPainter);
    return d->requested_region.boundingRect();
}

linestep()

int QDirectPainter::linestep ( )

static

Returns the length (in bytes) of each scanline of the framebuffer.

See also

frameBuffer()

Definition at line 696 of file qdirectpainter_qws.cpp.

{
    QScreen *screen = getPrimaryScreen();
    if (!screen)
        return 0;
    return screen->linestep();
}

lock()

void QDirectPainter::lock ( )

static

Locks access to the framebuffer.

Note that calling this function will prevent all other applications from updating the display until unlock() is called.

See also

unlock()

Definition at line 713 of file qdirectpainter_qws.cpp.

{
    QWSDisplay::grab(true);
}

lower()

void QDirectPainter::lower

(

)

Lowers the reserved region to the bottom of the widget stack.

Since

4.2

After this call the reserved region will be visually behind (and therefore obscured by) any overlapping widgets.

See also

raise(), requestedRegion()

Definition at line 573 of file qdirectpainter_qws.cpp.

{
    QWidget::qwsDisplay()->setAltitude(winId(),QWSChangeAltitudeCommand::Lower);
}

raise()

void QDirectPainter::raise

(

)

Raises the reserved region to the top of the widget stack.

Since

4.2

After this call the reserved region will be visually in front of any overlapping widgets.

See also

lower(), requestedRegion()

Definition at line 555 of file qdirectpainter_qws.cpp.

{
    QWidget::qwsDisplay()->setAltitude(winId(),QWSChangeAltitudeCommand::Raise);
}

region()

QRegion QDirectPainter::region ( )

inlinestatic

Use QDirectPainter::allocatedRegion() instead.

Definition at line 91 of file qdirectpainter_qws.h.

Referenced by setRegion().

{ return reservedRegion(); }

regionChanged()

void QDirectPainter::regionChanged ( const QRegion &  newRegion )

virtual

This function is called when the allocated region changes.

Since

4.2

This function is not called for region changes that happen while the startPainting() function is executing.

Note that the given region, newRegion, is not guaranteed to be correct at the time you access the display. To prevent reentrancy problems you should always call startPainting() before updating the display and then use allocatedRegion() to retrieve the correct region.

See also

allocatedRegion(), startPainting(), {Dynamic Allocation}

Definition at line 436 of file qdirectpainter_qws.cpp.

Referenced by qt_directpainter_region().

{
    Q_UNUSED(region);
}

requestedRegion()

QRegion QDirectPainter::requestedRegion

(

)

const

Returns the region requested by this QDirectPainter.

Since

4.2

Note that if the QDirectPainter::Reserved flag is set, the region returned by this function will always be equivalent to the region returned by the allocatedRegion() function. Otherwise they might differ (see Dynamic Allocation for details).

See also

geometry(), setRegion(), allocatedRegion()

Definition at line 370 of file qdirectpainter_qws.cpp.

{
    Q_D(const QDirectPainter);
    return d->requested_region;
}

reservedRegion()

QRegion QDirectPainter::reservedRegion ( )

static

Returns the reserved region.

Since

4.2

See also

reserveRegion(), frameBuffer()

Use allocatedRegion() instead.

Definition at line 646 of file qdirectpainter_qws.cpp.

{
    return QDirectPainterPrivate::staticPainter
        ? QDirectPainterPrivate::staticPainter->allocatedRegion() : QRegion();
}

reserveRegion()

QRegion QDirectPainter::reserveRegion ( const QRegion &  region )

static

Attempts to reserve the region and returns the region that is actually reserved.

This function also releases the previously reserved region if any. If not released explicitly, the region will be released on application exit.

See also

allocatedRegion(), {Static Allocation}

Construct a QDirectPainter using QDirectPainter::ReservedSynchronous instead.

Definition at line 598 of file qdirectpainter_qws.cpp.

{
    if (!QDirectPainterPrivate::staticPainter)
        QDirectPainterPrivate::staticPainter = new QDirectPainter(qApp, ReservedSynchronous);

    QDirectPainter *dp = QDirectPainterPrivate::staticPainter;
    dp->setRegion(reg);

    return dp->allocatedRegion();
}

screenDepth()

int QDirectPainter::screenDepth ( )

static

Returns the bit depth of the display.

See also

screenHeight(), screenWidth()

Definition at line 657 of file qdirectpainter_qws.cpp.

{
    QScreen *screen = getPrimaryScreen();
    if (!screen)
        return 0;
    return screen->depth();
}

screenHeight()

int QDirectPainter::screenHeight ( )

static

Returns the height of the display in pixels.

See also

screenWidth(), screenDepth()

Definition at line 683 of file qdirectpainter_qws.cpp.

{
    QScreen *screen = getPrimaryScreen();
    if (!screen)
        return 0;
    return screen->deviceHeight();
}

screenWidth()

int QDirectPainter::screenWidth ( )

static

Returns the width of the display in pixels.

See also

screenHeight(), screenDepth()

Definition at line 670 of file qdirectpainter_qws.cpp.

{
    QScreen *screen = getPrimaryScreen();
    if (!screen)
        return 0;
    return screen->deviceWidth();
}

setGeometry()

void QDirectPainter::setGeometry

(

const QRect &

rectangle

)

Request to reserve the given rectangle of the framebuffer.

Since

4.2

Note that the actually allocated region might differ from the requested one, e.g., if the given region overlaps with the region of another QDirectPainter object.

See also

geometry(), allocatedRegion(), setRegion()

Definition at line 305 of file qdirectpainter_qws.cpp.

{
    setRegion(rect);
}

setRegion()

void QDirectPainter::setRegion

(

const QRegion &

region

)

Requests to reserve the given region of the framebuffer.

Since

4.2

Note that the actually allocated region might differ from the requested one, e.g., if the given region overlaps with the region of another QDirectPainter object.

See also

requestedRegion(), allocatedRegion(), {Dynamic Allocation}

Definition at line 340 of file qdirectpainter_qws.cpp.

Referenced by qt_directpainter_embedevent(), reserveRegion(), and setGeometry().

{
    Q_D(QDirectPainter);
    d->requested_region = region;

    const QScreen *screen = d->surface->screen();
    if (screen->isTransformed()) {
        const QSize devSize(screen->deviceWidth(), screen->deviceHeight());
        const QRegion r = screen->mapFromDevice(region, devSize);
        d->surface->setRegion(r);
    } else {
        d->surface->setRegion(region);
    }
}

startPainting()

void QDirectPainter::startPainting

(

bool

lockDisplay = true

)

Call this function before you start updating the pixels in the allocated region.

Since

4.2

The hardware will be notified, if necessary, that you are about to start painting operations.

Set lockDisplay if you want startPainting() and endPainting() to lock() and unlock() the display automatically.

Note that for a NonReserved direct painter, you must call allocatedRegion() after calling this function, since the allocated region is only guaranteed to be correct after this function has returned.

The regionChanged() function will not be called between startPainting() and endPainting().

See also

endPainting(), flush()

Definition at line 464 of file qdirectpainter_qws.cpp.

{
    Q_D(QDirectPainter);
    d->surface->setLocking(lockDisplay);

    const QScreen *screen = d->surface->screen();
    if (screen->isTransformed()) {
        const QSize devSize(screen->deviceWidth(), screen->deviceHeight());
        const QRegion r = screen->mapFromDevice(d->surface->region(), devSize);
        d->surface->beginPaint(r);
    } else {
        d->surface->beginPaint(d->surface->region());
    }
}

unlock()

void QDirectPainter::unlock ( )

static

Unlocks the lock on the framebuffer (set using the lock() function), allowing other applications to access the screen.

See also

lock()

Definition at line 723 of file qdirectpainter_qws.cpp.

{
    QWSDisplay::ungrab();
}

winId()

WId QDirectPainter::winId

(

)

const

Returns the window system identifier of the widget.

Since

4.2

Definition at line 411 of file qdirectpainter_qws.cpp.

Referenced by lower(), and raise().

{
    Q_D(const QDirectPainter);
    return d->surface->windowId();
}

Friends and Related Functions

qt_directpainter_embedevent

void qt_directpainter_embedevent ( QDirectPainter *  , const QWSEmbedEvent *    )

friend

Definition at line 244 of file qdirectpainter_qws.cpp.

{
    if (event->type | QWSEmbedEvent::Region) {
        QScreen *screen = dp->d_func()->surface->screen();
        QRegion r = event->region;
        if (screen->isTransformed()) {
            const QSize screenSize(screen->width(), screen->height());
            r = screen->mapToDevice(r, screenSize);
        }
        dp->setRegion(r);
    }
}

qt_directpainter_region

void qt_directpainter_region ( QDirectPainter *  dp, const QRegion &  alloc, int  type  )

friend

Definition at line 223 of file qdirectpainter_qws.cpp.

{
    QDirectPainterPrivate *d = dp->d_func();

    QRegion r = alloc;
    QScreen *screen = d->surface->screen();
    if (screen->isTransformed()) {
        const QSize screenSize(screen->width(), screen->height());
        r = screen->mapToDevice(r, screenSize);
    }
    if (type == QWSRegionEvent::Allocation) {
        d->surface->setClipRegion(alloc);
        d->seenRegion = true;
        if (dp != QDirectPainterPrivate::staticPainter) {
            if (!d->surface->flushingRegionEvents) // recursion guard
                dp->regionChanged(r);
        }
    }
}

---

The documentation for this class was generated from the following files:

• /src/gui/embedded/qdirectpainter_qws.h
• /src/gui/embedded/qdirectpainter_qws.cpp