QX11WindowSurface Class Reference

#include <qwindowsurface_x11_p.h>

Inheritance diagram for QX11WindowSurface:

Public Functions
void	beginPaint (const QRegion &rgn)
	This function is called before painting onto the surface begins, with the region in which the painting will occur. More...
WindowSurfaceFeatures	features () const
void	flush (QWidget *widget, const QRegion &region, const QPoint &offset)
	Flushes the given region from the specified widget onto the screen. More...
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...
QPaintDevice *	paintDevice ()
	Implement this function to return the appropriate paint device. More...
	QX11WindowSurface (QWidget *widget)
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...
void	setGeometry (const QRect &rect)
	Sets the currently allocated area to be the given rect. More...
	~QX11WindowSurface ()
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 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...
QRect	geometry () const
	Returns the currently allocated area on the screen. 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...
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
QX11WindowSurfacePrivate *	d_ptr
GC	gc

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 69 of file qwindowsurface_x11_p.h.

Constructors and Destructors

QX11WindowSurface()

QX11WindowSurface::QX11WindowSurface

(

QWidget *

widget

)

Definition at line 66 of file qwindowsurface_x11.cpp.

    : QWindowSurface(widget), d_ptr(new QX11WindowSurfacePrivate), gc(0)
{
    d_ptr->widget = widget;
#ifndef QT_NO_XRENDER
    d_ptr->translucentBackground = X11->use_xrender
        && widget->x11Info().depth() == 32;
#endif
}

~QX11WindowSurface()

QX11WindowSurface::~QX11WindowSurface

(

)

Definition at line 77 of file qwindowsurface_x11.cpp.

{
    delete d_ptr;
    if (gc) {
        XFreeGC(X11->display, gc);
        gc = 0;
    }
}

Functions

beginPaint()

void QX11WindowSurface::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 91 of file qwindowsurface_x11.cpp.

{
#ifndef QT_NO_XRENDER
    Q_ASSERT(!d_ptr->device.isNull());

    if (d_ptr->translucentBackground) {
        if (d_ptr->device.depth() != 32)
            static_cast<QX11PixmapData *>(d_ptr->device.data_ptr().data())->convertToARGB32();
        ::Picture src = X11->getSolidFill(d_ptr->device.x11Info().screen(), Qt::transparent);
        ::Picture dst = d_ptr->device.x11PictureHandle();
        const QVector<QRect> rects = rgn.rects();
        const int w = d_ptr->device.width();
        const int h = d_ptr->device.height();
        for (QVector<QRect>::const_iterator it = rects.begin(); it != rects.end(); ++it)
            XRenderComposite(X11->display, PictOpSrc, src, 0, dst,
                             0, 0, w, h, it->x(), it->y(),
                             it->width(), it->height());
    }
#endif
}

features()

QWindowSurface::WindowSurfaceFeatures QX11WindowSurface::features ( ) const

virtual

Reimplemented from QWindowSurface.

Definition at line 253 of file qwindowsurface_x11.cpp.

{
    WindowSurfaceFeatures features = QWindowSurface::PartialUpdates | QWindowSurface::PreservedContents;
#ifndef QT_NO_XRENDER
    if (!d_ptr->translucentBackground)
        features |= QWindowSurface::StaticContents;
#else
    features |= QWindowSurface::StaticContents;
#endif
    return features;
}

flush()

void QX11WindowSurface::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 112 of file qwindowsurface_x11.cpp.

{
    if (d_ptr->device.isNull())
        return;

    QPoint wOffset = qt_qwidget_data(widget)->wrect.topLeft();
    QRegion wrgn(rgn);
    QRect br = rgn.boundingRect();
    if (!wOffset.isNull())
        wrgn.translate(-wOffset);
    QRect wbr = wrgn.boundingRect();

    int num;
    XRectangle *rects = (XRectangle *)qt_getClipRects(wrgn, num);
    if (num <= 0)
        return;
//         qDebug() << "XSetClipRectangles";
//         for  (int i = 0; i < num; ++i)
//             qDebug() << ' ' << i << rects[i].x << rects[i].x << rects[i].y << rects[i].width << rects[i].height;
    if (num != 1)
        XSetClipRectangles(X11->display, gc, 0, 0, rects, num, YXBanded);
    XCopyArea(X11->display, d_ptr->device.handle(), widget->handle(), gc,
              br.x() + offset.x(), br.y() + offset.y(), br.width(), br.height(), wbr.x(), wbr.y());
    if (num != 1)
        XSetClipMask(X11->display, gc, XNone);
}

grabWidget()

QPixmap QX11WindowSurface::grabWidget ( const QWidget *  widget, const QRect &  rectangle = QRect()  ) const

virtual

Returns a QPixmap generated from the part of the backing store corresponding to widget.

Returns a null QPixmap if an error occurs. The contents of the pixmap are only defined for the regions of widget that have received paint events since the last resize of the backing store.

If rectangle is a null rectangle (the default), the entire widget is grabbed. Otherwise, the grabbed area is limited to rectangle.

The default implementation uses QWindowSurface::buffer().

See also

QPixmap::grabWidget()

Reimplemented from QWindowSurface.

Definition at line 217 of file qwindowsurface_x11.cpp.

{
    if (!widget || d_ptr->device.isNull())
        return QPixmap();

    QRect srcRect;

    // make sure the rect is inside the widget & clip to widget's rect
    if (!rect.isEmpty())
        srcRect = rect & widget->rect();
    else
        srcRect = widget->rect();

    if (srcRect.isEmpty())
        return QPixmap();

    // If it's a child widget we have to translate the coordinates
    if (widget != window())
        srcRect.translate(widget->mapTo(window(), QPoint(0, 0)));

    QPixmap::x11SetDefaultScreen(widget->x11Info().screen());
    QPixmap px(srcRect.width(), srcRect.height());

    GC tmpGc = XCreateGC(X11->display, d_ptr->device.handle(), 0, 0);

    // Copy srcRect from the backing store to the new pixmap
    XSetGraphicsExposures(X11->display, tmpGc, False);
    XCopyArea(X11->display, d_ptr->device.handle(), px.handle(), tmpGc,
              srcRect.x(), srcRect.y(), srcRect.width(), srcRect.height(), 0, 0);

    XFreeGC(X11->display, tmpGc);

    return px;
}

paintDevice()

QPaintDevice * QX11WindowSurface::paintDevice ( )

virtual

Implement this function to return the appropriate paint device.

Implements QWindowSurface.

Definition at line 86 of file qwindowsurface_x11.cpp.

{
    return &d_ptr->device;
}

scroll()

bool QX11WindowSurface::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 201 of file qwindowsurface_x11.cpp.

{
    QRect rect = area.boundingRect();

    if (d_ptr->device.isNull())
        return false;

    GC gc = XCreateGC(X11->display, d_ptr->device.handle(), 0, 0);
    XCopyArea(X11->display, d_ptr->device.handle(), d_ptr->device.handle(), gc,
              rect.x(), rect.y(), rect.width(), rect.height(),
              rect.x()+dx, rect.y()+dy);
    XFreeGC(X11->display, gc);

    return true;
}

setGeometry()

void QX11WindowSurface::setGeometry ( const QRect &  rect )

virtual

Sets the currently allocated area to be the given rect.

This function is called whenever area covered by the top-level window changes.

See also

geometry()

Reimplemented from QWindowSurface.

Definition at line 139 of file qwindowsurface_x11.cpp.

{
    QWindowSurface::setGeometry(rect);

    const QSize size = rect.size();

    if (d_ptr->device.size() == size || size.width() <= 0 || size.height() <= 0)
        return;
#ifndef QT_NO_XRENDER
    if (d_ptr->translucentBackground) {
        QPixmap::x11SetDefaultScreen(d_ptr->widget->x11Info().screen());

        QX11PixmapData *data = new QX11PixmapData(QPixmapData::PixmapType);
        data->xinfo = d_ptr->widget->x11Info();
        data->resize(size.width(), size.height());
        d_ptr->device = QPixmap(data);
    } else
#endif
    {
        QPixmap::x11SetDefaultScreen(d_ptr->widget->x11Info().screen());

        QX11PixmapData *oldData = static_cast<QX11PixmapData *>(d_ptr->device.pixmapData());

        if (oldData && !(oldData->flags & QX11PixmapData::Uninitialized) && hasStaticContents()) {
            // Copy the content of the old pixmap into the new one.
            QX11PixmapData *newData = new QX11PixmapData(QPixmapData::PixmapType);
            newData->resize(size.width(), size.height());
            Q_ASSERT(oldData->d == newData->d);

            QRegion staticRegion(staticContents());
            // Make sure we're inside the boundaries of the old pixmap.
            staticRegion &= QRect(0, 0, oldData->w, oldData->h);
            const QRect boundingRect(staticRegion.boundingRect());
            const int dx = boundingRect.x();
            const int dy = boundingRect.y();

            int num;
            XRectangle *rects = (XRectangle *)qt_getClipRects(staticRegion, num);
            GC tmpGc = XCreateGC(X11->display, oldData->hd, 0, 0);
            XSetClipRectangles(X11->display, tmpGc, 0, 0, rects, num, YXBanded);
            XCopyArea(X11->display, oldData->hd, newData->hd, tmpGc,
                      dx, dy, qMin(boundingRect.width(), size.width()),
                      qMin(boundingRect.height(), size.height()), dx, dy);
            XFreeGC(X11->display, tmpGc);
            newData->flags &= ~QX11PixmapData::Uninitialized;

            d_ptr->device = QPixmap(newData);
        } else {
            d_ptr->device = QPixmap(size);
        }
    }

    if (gc) {
        XFreeGC(X11->display, gc);
        gc = 0;
    }
    if (!d_ptr->device.isNull()) {
        gc = XCreateGC(X11->display, d_ptr->device.handle(), 0, 0);
        XSetGraphicsExposures(X11->display, gc, False);
    }
}

Properties

d_ptr

QX11WindowSurfacePrivate* QX11WindowSurface::d_ptr

private

Definition at line 86 of file qwindowsurface_x11_p.h.

Referenced by beginPaint(), features(), flush(), grabWidget(), paintDevice(), QX11WindowSurface(), scroll(), setGeometry(), and ~QX11WindowSurface().

gc

GC QX11WindowSurface::gc

private

Definition at line 87 of file qwindowsurface_x11_p.h.

Referenced by flush(), scroll(), setGeometry(), and ~QX11WindowSurface().

---

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

• /src/gui/painting/qwindowsurface_x11_p.h
• /src/gui/painting/qwindowsurface_x11.cpp