QRasterWindow Class

QRasterWindow is a convenience class for using QPainter on a QWindow. More...

Header: #include <QRasterWindow>
Inherits: QPaintDeviceWindow

Public Functions

QRasterWindow(QWindow *parent = nullptr)

Reimplemented Protected Functions

virtual int metric(PaintDeviceMetric metric) const override
virtual QPaintDevice *redirected(QPoint *) const override

Detailed Description

\inmoduleQtGui \since 5.4

QRasterWindow is a QWindow with a raster-based, non-OpenGL surface. On top of the functionality offered by QWindow, QRasterWindow adds a virtual paintEvent() function and the possibility to open a QPainter on itself. The underlying paint engine will be the raster one, meaning that all drawing will happen on the CPU. For performing accelerated, OpenGL-based drawing, use QOpenGLWindow instead.

Internally the class is thin wrapper for QWindow and QBackingStore and is very similar to the Raster Window Example that uses these classes directly.

See also QPaintDeviceWindow::paintEvent() and QPaintDeviceWindow::update().

Member Function Documentation

[explicit] QRasterWindow::QRasterWindow(QWindow *parent = nullptr)

Constructs a new QRasterWindow with parent.

[override virtual protected] int QRasterWindow::metric(PaintDeviceMetric metric) const

Reimplements: QPaintDeviceWindow::metric(PaintDeviceMetric metric) const.

\internal

[override virtual protected] QPaintDevice *QRasterWindow::redirected(QPoint *) const

Reimplements: QPaintDevice::redirected(QPoint *offset) const.

\internal