| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #include "qrasterwindow.h" |
| 5 | |
| 6 | #include <QtGui/private/qpaintdevicewindow_p.h> |
| 7 | |
| 8 | #include <QtGui/QBackingStore> |
| 9 | #include <QtGui/QPainter> |
| 10 | |
| 11 | QT_BEGIN_NAMESPACE |
| 12 | |
| 13 | /*! |
| 14 | \class QRasterWindow |
| 15 | \inmodule QtGui |
| 16 | \since 5.4 |
| 17 | \brief QRasterWindow is a convenience class for using QPainter on a QWindow. |
| 18 | |
| 19 | QRasterWindow is a QWindow with a raster-based, non-OpenGL surface. On top of |
| 20 | the functionality offered by QWindow, QRasterWindow adds a virtual |
| 21 | paintEvent() function and the possibility to open a QPainter on itself. The |
| 22 | underlying paint engine will be the raster one, meaning that all drawing will |
| 23 | happen on the CPU. For performing accelerated, OpenGL-based drawing, use |
| 24 | QOpenGLWindow instead. |
| 25 | |
| 26 | Internally the class is thin wrapper for QWindow and QBackingStore |
| 27 | and is very similar to the \l{Raster Window Example}{Raster Window |
| 28 | Example} that uses these classes directly. |
| 29 | |
| 30 | \sa QPaintDeviceWindow::paintEvent(), QPaintDeviceWindow::update() |
| 31 | */ |
| 32 | |
| 33 | class QRasterWindowPrivate : public QPaintDeviceWindowPrivate |
| 34 | { |
| 35 | Q_DECLARE_PUBLIC(QRasterWindow) |
| 36 | public: |
| 37 | void beginPaint(const QRegion ®ion) override |
| 38 | { |
| 39 | Q_Q(QRasterWindow); |
| 40 | const QSize size = q->size(); |
| 41 | if (backingstore->size() != size) { |
| 42 | backingstore->resize(size); |
| 43 | markWindowAsDirty(); |
| 44 | } |
| 45 | backingstore->beginPaint(region); |
| 46 | } |
| 47 | |
| 48 | void endPaint() override |
| 49 | { |
| 50 | backingstore->endPaint(); |
| 51 | } |
| 52 | |
| 53 | void flush(const QRegion ®ion) override |
| 54 | { |
| 55 | Q_Q(QRasterWindow); |
| 56 | backingstore->flush(region, window: q); |
| 57 | } |
| 58 | |
| 59 | QScopedPointer<QBackingStore> backingstore; |
| 60 | }; |
| 61 | |
| 62 | /*! |
| 63 | Constructs a new QRasterWindow with \a parent. |
| 64 | */ |
| 65 | QRasterWindow::QRasterWindow(QWindow *parent) |
| 66 | : QPaintDeviceWindow(*(new QRasterWindowPrivate), parent) |
| 67 | { |
| 68 | setSurfaceType(QSurface::RasterSurface); |
| 69 | d_func()->backingstore.reset(other: new QBackingStore(this)); |
| 70 | } |
| 71 | |
| 72 | QRasterWindow::~QRasterWindow() |
| 73 | { |
| 74 | Q_D(QRasterWindow); |
| 75 | // Delete backingstore while window is still alive, as it |
| 76 | // might need to reference the window in the process |
| 77 | d->backingstore.reset(other: nullptr); |
| 78 | } |
| 79 | |
| 80 | /*! |
| 81 | \internal |
| 82 | */ |
| 83 | int QRasterWindow::metric(PaintDeviceMetric metric) const |
| 84 | { |
| 85 | Q_D(const QRasterWindow); |
| 86 | |
| 87 | switch (metric) { |
| 88 | case PdmDepth: |
| 89 | return d->backingstore->paintDevice()->depth(); |
| 90 | default: |
| 91 | break; |
| 92 | } |
| 93 | return QPaintDeviceWindow::metric(metric); |
| 94 | } |
| 95 | |
| 96 | /*! |
| 97 | \internal |
| 98 | */ |
| 99 | QPaintDevice *QRasterWindow::redirected(QPoint *) const |
| 100 | { |
| 101 | Q_D(const QRasterWindow); |
| 102 | return d->backingstore->paintDevice(); |
| 103 | } |
| 104 | |
| 105 | QT_END_NAMESPACE |
| 106 | |
| 107 | #include "moc_qrasterwindow.cpp" |
| 108 |