QXcbWindowSurface Class Reference

#include <qxcbwindowsurface.h>

Inheritance diagram for QXcbWindowSurface:

Public Functions
void	beginPaint (const QRegion &)
	This function is called before painting onto the surface begins, with the region in which the painting will occur. More...
void	endPaint (const QRegion &)
	This function is called after painting onto the surface has ended, with the region in which the painting was performed. More...
void	flush (QWidget *widget, const QRegion &region, const QPoint &offset)
	Flushes the given region from the specified widget onto the screen. More...
QPaintDevice *	paintDevice ()
	Implement this function to return the appropriate paint device. More...
	QXcbWindowSurface (QWidget *widget, bool setDefaultSurface=true)
void	resize (const QSize &size)
bool	scroll (const QRegion &area, int dx, int dy)
	Scrolls the given area dx pixels to the right and dy downward; both dx and dy may be negative. More...
	~QXcbWindowSurface ()
Public Functions inherited from QXcbObject
xcb_atom_t	atom (QXcbAtom::Atom atom) const
QXcbConnection *	connection () const
	QXcbObject (QXcbConnection *connection=0)
void	setConnection (QXcbConnection *connection)
xcb_connection_t *	xcb_connection () const
Public Functions inherited from QWindowSurface
virtual QImage *	buffer (const QWidget *widget)
	Returns a QImage pointer which represents the actual buffer the widget is drawn into or 0 if this is unavailable. More...
virtual WindowSurfaceFeatures	features () const
QRect	geometry () const
	Returns the currently allocated area on the screen. More...
virtual QPixmap	grabWidget (const QWidget *widget, const QRect &rectangle=QRect()) const
	Returns a QPixmap generated from the part of the backing store corresponding to widget. More...
bool	hasFeature (WindowSurfaceFeature feature) const
virtual QPoint	offset (const QWidget *widget) const
	Returns the offset of widget in the coordinates of this window surface. More...
	QWindowSurface (QWidget *window, bool setDefaultSurface=true)
	Constructs an empty surface for the given top-level window. More...
QRect	rect (const QWidget *widget) const
	Returns the rectangle for widget in the coordinates of this window surface. More...
virtual void	setGeometry (const QRect &rect)
	Sets the currently allocated area to be the given rect. More...
void	setStaticContents (const QRegion &region)
QRegion	staticContents () const
QWidget *	window () const
	Returns a pointer to the top-level window associated with this surface. More...
virtual	~QWindowSurface ()
	Destroys this surface. More...

Properties
QXcbShmImage *	m_image
bool	m_syncingResize

Additional Inherited Members
Public Types inherited from QWindowSurface
enum	WindowSurfaceFeature { PartialUpdates = 0x00000001, PreservedContents = 0x00000002, StaticContents = 0x00000004, AllFeatures = 0xffffffff }
Protected Functions inherited from QWindowSurface
bool	hasStaticContents () const

Detailed Description

Definition at line 53 of file qxcbwindowsurface.h.

Constructors and Destructors

QXcbWindowSurface()

QXcbWindowSurface::QXcbWindowSurface	(	QWidget *	widget,
		bool	setDefaultSurface = true
	)

Definition at line 171 of file qxcbwindowsurface.cpp.

    : QWindowSurface(widget, setDefaultSurface)
    , m_image(0)
    , m_syncingResize(false)
{
    QXcbScreen *screen = static_cast<QXcbScreen *>(QPlatformScreen::platformScreenForWidget(widget));
    setConnection(screen->connection());
}

~QXcbWindowSurface()

QXcbWindowSurface::~QXcbWindowSurface

(

)

Definition at line 180 of file qxcbwindowsurface.cpp.

{
    delete m_image;
}

Functions

beginPaint()

void QXcbWindowSurface::beginPaint ( const QRegion &  region )

virtual

This function is called before painting onto the surface begins, with the region in which the painting will occur.

See also

endPaint(), paintDevice()

Reimplemented from QWindowSurface.

Definition at line 190 of file qxcbwindowsurface.cpp.

{
    m_image->preparePaint(region);

    if (m_image->image()->hasAlphaChannel()) {
        QPainter p(m_image->image());
        p.setCompositionMode(QPainter::CompositionMode_Source);
        const QVector<QRect> rects = region.rects();
        const QColor blank = Qt::transparent;
        for (QVector<QRect>::const_iterator it = rects.begin(); it != rects.end(); ++it) {
            p.fillRect(*it, blank);
        }
    }
}

endPaint()

void QXcbWindowSurface::endPaint ( const QRegion &  region )

virtual

This function is called after painting onto the surface has ended, with the region in which the painting was performed.

See also

beginPaint(), paintDevice()

Reimplemented from QWindowSurface.

Definition at line 205 of file qxcbwindowsurface.cpp.

{
}

flush()

void QXcbWindowSurface::flush ( QWidget *  widget, const QRegion &  region, const QPoint &  offset  )

virtual

Flushes the given region from the specified widget onto the screen.

Note that the offset parameter is currently unused.

Implements QWindowSurface.

Definition at line 209 of file qxcbwindowsurface.cpp.

{
    QRect bounds = region.boundingRect();

    if (size().isEmpty() || !geometry().contains(bounds))
        return;

    Q_XCB_NOOP(connection());

    QXcbWindow *window = static_cast<QXcbWindow *>(widget->window()->platformWindow());

    extern QWidgetData* qt_widget_data(QWidget *);
    QPoint widgetOffset = qt_qwidget_data(widget)->wrect.topLeft();

    QVector<QRect> rects = region.rects();
    for (int i = 0; i < rects.size(); ++i)
        m_image->put(window->window(), rects.at(i).topLeft() - widgetOffset, rects.at(i).translated(offset));

    Q_XCB_NOOP(connection());

    if (m_syncingResize) {
        xcb_flush(xcb_connection());
        connection()->sync();
        m_syncingResize = false;
        window->updateSyncRequestCounter();
    }
}

paintDevice()

QPaintDevice * QXcbWindowSurface::paintDevice ( )

virtual

Implement this function to return the appropriate paint device.

Implements QWindowSurface.

Definition at line 185 of file qxcbwindowsurface.cpp.

{
    return m_image->image();
}

resize()

void QXcbWindowSurface::resize

(

const QSize &

size

)

Definition at line 237 of file qxcbwindowsurface.cpp.

{
    if (size == QWindowSurface::size())
        return;

    Q_XCB_NOOP(connection());
    QWindowSurface::resize(size);

    QXcbScreen *screen = static_cast<QXcbScreen *>(QPlatformScreen::platformScreenForWidget(window()));
    QXcbWindow* win = static_cast<QXcbWindow *>(window()->platformWindow());

    delete m_image;
    m_image = new QXcbShmImage(screen, size, win->depth(), win->format());
    Q_XCB_NOOP(connection());

    m_syncingResize = true;
}

scroll()

bool QXcbWindowSurface::scroll ( const QRegion &  area, int  dx, int  dy  )

virtual

Scrolls the given area dx pixels to the right and dy downward; both dx and dy may be negative.

Returns true if the area was scrolled successfully; false otherwise.

Reimplemented from QWindowSurface.

Definition at line 257 of file qxcbwindowsurface.cpp.

{
    if (m_image->image()->isNull())
        return false;

    m_image->preparePaint(area);

    const QVector<QRect> rects = area.rects();
    for (int i = 0; i < rects.size(); ++i)
        qt_scrollRectInImage(*m_image->image(), rects.at(i), QPoint(dx, dy));

    return true;
}

Properties

m_image

QXcbShmImage* QXcbWindowSurface::m_image

private

Definition at line 68 of file qxcbwindowsurface.h.

Referenced by beginPaint(), flush(), paintDevice(), resize(), scroll(), and ~QXcbWindowSurface().

m_syncingResize

bool QXcbWindowSurface::m_syncingResize

private

Definition at line 69 of file qxcbwindowsurface.h.

Referenced by flush(), and resize().

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

• /src/plugins/platforms/xcb/qxcbwindowsurface.h
• /src/plugins/platforms/xcb/qxcbwindowsurface.cpp