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| |
| #include "qrasterwindow.h" |
| |
| #include <QtGui/private/qpaintdevicewindow_p.h> |
| |
| #include <QtGui/QBackingStore> |
| #include <QtGui/QPainter> |
| |
| QT_BEGIN_NAMESPACE |
| |
| /*! |
| \class QRasterWindow |
| \inmodule QtGui |
| \since 5.4 |
| \brief QRasterWindow is a convenience class for using QPainter on a QWindow. |
| |
| 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 \l{Raster Window Example}{Raster Window |
| Example} that uses these classes directly. |
| |
| \sa QPaintDeviceWindow::paintEvent(), QPaintDeviceWindow::update() |
| */ |
| |
| class QRasterWindowPrivate : public QPaintDeviceWindowPrivate |
| { |
| Q_DECLARE_PUBLIC(QRasterWindow) |
| public: |
| void beginPaint(const QRegion ®ion) override |
| { |
| Q_Q(QRasterWindow); |
| const QSize size = q->size(); |
| if (backingstore->size() != size) { |
| backingstore->resize(size); |
| markWindowAsDirty(); |
| } |
| backingstore->beginPaint(region); |
| } |
| |
| void endPaint() override |
| { |
| backingstore->endPaint(); |
| } |
| |
| void flush(const QRegion ®ion) override |
| { |
| Q_Q(QRasterWindow); |
| backingstore->flush(region, q); |
| } |
| |
| QScopedPointer<QBackingStore> backingstore; |
| }; |
| |
| /*! |
| Constructs a new QRasterWindow with \a parent. |
| */ |
| QRasterWindow::QRasterWindow(QWindow *parent) |
| : QPaintDeviceWindow(*(new QRasterWindowPrivate), parent) |
| { |
| setSurfaceType(QSurface::RasterSurface); |
| d_func()->backingstore.reset(new QBackingStore(this)); |
| } |
| |
| QRasterWindow::~QRasterWindow() |
| { |
| Q_D(QRasterWindow); |
| // Delete backingstore while window is still alive, as it |
| // might need to reference the window in the process |
| d->backingstore.reset(nullptr); |
| } |
| |
| /*! |
| \internal |
| */ |
| int QRasterWindow::metric(PaintDeviceMetric metric) const |
| { |
| Q_D(const QRasterWindow); |
| |
| switch (metric) { |
| case PdmDepth: |
| return d->backingstore->paintDevice()->depth(); |
| default: |
| break; |
| } |
| return QPaintDeviceWindow::metric(metric); |
| } |
| |
| /*! |
| \internal |
| */ |
| QPaintDevice *QRasterWindow::redirected(QPoint *) const |
| { |
| Q_D(const QRasterWindow); |
| return d->backingstore->paintDevice(); |
| } |
| |
| QT_END_NAMESPACE |