QRasterPaintEngine Class▲
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Header: QRasterPaintEngine
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CMake:
find_package(Qt6 REQUIRED COMPONENTS Gui)
target_link_libraries(mytarget PRIVATE Qt6::Gui)
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qmake: QT += gui
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Inherits: QPaintEngineEx
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Inherited By:
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Group: QRasterPaintEngine is part of qws
This class is under development and is subject to change.
Detailed Description▲
Note that this functionality is only available in Qt for Embedded Linux.
In Qt for Embedded Linux, painting is a pure software implementation. But starting with Qt 4.2, it is possible to add an accelerated graphics driver to take advantage of available hardware resources.
Hardware acceleration is accomplished by creating a custom screen driver, accelerating the copying from memory to the screen, and implementing a custom paint engine accelerating the various painting operations. Then a custom paint device and a custom window surface must be implemented to make Qt for Embedded Linux aware of the accelerated driver.
The QRasterPaintEngine class does not support 8-bit images. Instead, they need to be converted to a supported format, such as QImage::Format_ARGB32_Premultiplied.
See Also▲
See also QPaintEngine
Member Function Documentation▲
QRasterPaintEngine::QRasterPaintEngine(QPaintDevice *device)▲
Creates a raster based paint engine for operating on the given device, with the complete set of paint engine features and capabilities.
[virtual] QRasterPaintEngine::~QRasterPaintEngine()▲
Destroys this paint engine.
[override virtual] bool QRasterPaintEngine::begin(QPaintDevice *device)▲
Reimplements: QPaintEngine::begin(QPaintDevice *pdev).
[override virtual] void QRasterPaintEngine::drawEllipse(const QRectF &rect)▲
Reimplements: QPaintEngine::drawEllipse(const QRectF &rect).
[override virtual] void QRasterPaintEngine::drawImage(const QRectF &r, const QImage &img, const QRectF &sr, Qt::ImageConversionFlags flags = Qt::AutoColor)▲
Reimplements: QPaintEngine::drawImage(const QRectF &rectangle, const QImage &image, const QRectF &sr, Qt::ImageConversionFlags flags).
[override virtual] void QRasterPaintEngine::drawLines(const QLine *lines, int lineCount)▲
Reimplements: QPaintEngine::drawLines(const QLine *lines, int lineCount).
[override virtual] void QRasterPaintEngine::drawLines(const QLineF *lines, int lineCount)▲
Reimplements: QPaintEngine::drawLines(const QLineF *lines, int lineCount).
[override virtual] void QRasterPaintEngine::drawPixmap(const QRectF &r, const QPixmap &pixmap, const QRectF &sr)▲
[override virtual] void QRasterPaintEngine::drawPoints(const QPointF *points, int pointCount)▲
[override virtual] void QRasterPaintEngine::drawPolygon(const QPointF *points, int pointCount, QPaintEngine::PolygonDrawMode mode)▲
Reimplements: QPaintEngine::drawPolygon(const QPointF *points, int pointCount, QPaintEngine::PolygonDrawMode mode).
[override virtual] void QRasterPaintEngine::drawPolygon(const QPoint *points, int pointCount, QPaintEngine::PolygonDrawMode mode)▲
Reimplements: QPaintEngine::drawPolygon(const QPoint *points, int pointCount, QPaintEngine::PolygonDrawMode mode).
[override virtual] void QRasterPaintEngine::drawRects(const QRect *rects, int rectCount)▲
Reimplements: QPaintEngine::drawRects(const QRect *rects, int rectCount).
[override virtual] void QRasterPaintEngine::drawRects(const QRectF *rects, int rectCount)▲
Reimplements: QPaintEngine::drawRects(const QRectF *rects, int rectCount).
[override virtual] void QRasterPaintEngine::drawStaticTextItem(QStaticTextItem *textItem)▲
[override virtual] void QRasterPaintEngine::drawTextItem(const QPointF &p, const QTextItem &textItem)▲
[override virtual] void QRasterPaintEngine::drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &sr)▲
Reimplements: QPaintEngine::drawTiledPixmap(const QRectF &rect, const QPixmap &pixmap, const QPointF &p).
[override virtual] bool QRasterPaintEngine::end()▲
Reimplements: QPaintEngine::end().
[override virtual] void QRasterPaintEngine::fillRect(const QRectF &r, const QBrush &brush)▲
[override virtual] void QRasterPaintEngine::fillRect(const QRectF &r, const QColor &color)▲
[override virtual] bool QRasterPaintEngine::shouldDrawCachedGlyphs(QFontEngine *fontEngine, const QTransform &m) const▲
Returns whether glyph caching is supported by the font engine fontEngine with the given transform m applied.