Enables hardware acceleration of painting operations on Embedded Linux. More...

Inherits QPaintEngineEx

Inherited by QBlitterPaintEngine

Public Methods
	QRasterPaintEngine (QPaintDevice *device)

	~QRasterPaintEngine ()

bool	begin (QPaintDevice *device) override

void	drawEllipse (const QRectF &rect) override

void	drawImage (const QRectF &rect, const QImage &image, const QRectF &srcRect, Qt::ImageConversionFlags flags=Qt::AutoColor) override

void	drawLines (const QLine *lines, int lineCount) override

void	drawLines (const QLineF *lines, int lineCount) override

void	drawPixmap (const QPointF &point, const QPixmap &pixmap) override

void	drawPixmap (const QRectF &rect, const QPixmap &pixmap, const QRectF &srcRect) override

void	drawPoints (const QPoint *points, int pointCount) override

void	drawPoints (const QPointF *points, int pointCount) override

void	drawPolygon (const QPoint *points, int pointCount, PolygonDrawMode mode) override

void	drawPolygon (const QPointF *points, int pointCount, PolygonDrawMode mode) override

void	drawRects (const QRect *rects, int rectCount) override

void	drawRects (const QRectF *rects, int rectCount) override

void	drawStaticTextItem (QStaticTextItem *textItem) override

void	drawTextItem (const QPointF &point, const QTextItem &textItem) override

void	drawTiledPixmap (const QRectF &rect, const QPixmap &pixmap, const QPointF &srcRect) override

bool	end () override

void	fillRect (const QRectF &rect, const QBrush &brush) override

void	fillRect (const QRectF &rect, const QColor &color) override

bool	shouldDrawCachedGlyphs (QFontEngine *fontEngine, const QTransform &m) const override

Type	type () const override

Related Functions
These are not member functions
typedef	QSpan

Detailed Description

The QRasterPaintEngine class enables hardware acceleration of painting operations on Embedded Linux.

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 Embedded Linux aware of the accelerated driver.

The QRasterPaintEngine class does not support 8-bit images. These must be converted to a supported format such as QImage::Format_ARGB32_Premultiplied.

See also: QPaintEngine

Constructor & Destructor 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.

QRasterPaintEngine::~QRasterPaintEngine ( )

Destroys this paint engine.

Method Documentation

bool QRasterPaintEngine::begin ( QPaintDevice * device )

overridevirtual

Implements QPaintEngine::begin()

void QRasterPaintEngine::drawEllipse ( const QRectF & rect )

overridevirtual

Draws the largest ellipse that can be contained within rect.

Reimplemented from QPaintEngine::drawEllipse()

void QRasterPaintEngine::drawImage	(	const QRectF &	rect,
		const QImage &	image,
		const QRectF &	srcRect,
		Qt::ImageConversionFlags	flags = `Qt::AutoColor`
	)

overridevirtual

Draws the part of the image specified by srcRect in the given rect using the given conversion flags, to convert it to a pixmap.

Reimplemented from QPaintEngine::drawImage()

void QRasterPaintEngine::drawLines	(	const QLine *	lines,
		int	lineCount
	)

overridevirtual

Converts the list of lines starting at lines for the given number of lines, specified in lineCount, to a QLineF and calls the floating point version of this method.

Reimplemented from QPaintEngine::drawLines()

void QRasterPaintEngine::drawLines	(	const QLineF *	lines,
		int	lineCount
	)

overridevirtual

Splits the list of lines starting at lines into lineCount separate calls to drawPath() or drawPolygon() depending on the feature set of the paint engine.

Reimplemented from QPaintEngine::drawLines()

void QRasterPaintEngine::drawPixmap	(	const QPointF &	point,
		const QPixmap &	pixmap
	)

override

Draws the pixmap specified at the given point.

void QRasterPaintEngine::drawPixmap	(	const QRectF &	rect,
		const QPixmap &	pixmap,
		const QRectF &	srcRect
	)

overridevirtual

Draws a portion of the pixmap specified by the rectangle srcRect, in the given rect.

Implements QPaintEngine::drawPixmap()

void QRasterPaintEngine::drawPoints	(	const QPoint *	points,
		int	pointCount
	)

overridevirtual

Draws points starting from points for the given number of points specified in pointCount.

Reimplemented from QPaintEngine::drawPoints()

void QRasterPaintEngine::drawPoints	(	const QPointF *	points,
		int	pointCount
	)

overridevirtual

Draws points starting from points for the given number of points specified in pointCount.

Reimplemented from QPaintEngine::drawPoints()

void QRasterPaintEngine::drawPolygon	(	const QPoint *	points,
		int	pointCount,
		PolygonDrawMode	mode
	)

overridevirtual

This method draws a polygon defined by points starting at points for the given number of points specified in pointCount. The mode specifies the algorithm used to draw the polygon.

Reimplemented from QPaintEngine::drawPolygon()

void QRasterPaintEngine::drawPolygon	(	const QPointF *	points,
		int	pointCount,
		PolygonDrawMode	mode
	)

overridevirtual

This method draws a polygon defined by points starting at points for the given number of points specified in pointCount. The mode specifies the algorithm used to draw the polygon.

Reimplemented from QPaintEngine::drawPolygon()

void QRasterPaintEngine::drawRects	(	const QRect *	rects,
		int	rectCount
	)

overridevirtual

Draws rectangles starting from rects for the given number of rectangles specified in rectCount.

Reimplemented from QPaintEngine::drawRects()

void QRasterPaintEngine::drawRects	(	const QRectF *	rects,
		int	rectCount
	)

overridevirtual

Draws rectangles starting from rects for the given number of rectangles specified in rectCount.

Reimplemented from QPaintEngine::drawRects()

void QRasterPaintEngine::drawStaticTextItem ( QStaticTextItem * textItem )

override

Draws the given textItem.

void QRasterPaintEngine::drawTextItem	(	const QPointF &	point,
		const QTextItem &	textItem
	)

overridevirtual

Draws the text item textItem at position point.

Reimplemented from QPaintEngine::drawTextItem()

void QRasterPaintEngine::drawTiledPixmap	(	const QRectF &	rect,
		const QPixmap &	pixmap,
		const QPointF &	srcRect
	)

overridevirtual

Draws the pixmap in the given rect, starting at the given point. The pixmap will be drawn repeatedly until the rect is filled.

Reimplemented from QPaintEngine::drawTiledPixmap()

bool QRasterPaintEngine::end ( )

overridevirtual

Finishes painting on the current paint device. Returns true if painting was finished successfully, otherwise return false.

Implements QPaintEngine::end()

void QRasterPaintEngine::fillRect	(	const QRectF &	rect,
		const QBrush &	brush
	)

override

Fills the given rect using the brush. Alternatively, you can specify a QColor instead of a QBrush. The QBrush constructor will automatically create a solid pattern brush.

void QRasterPaintEngine::fillRect	(	const QRectF &	rect,
		const QColor &	color
	)

override

Fills the given rect with the specified color.

bool QRasterPaintEngine::shouldDrawCachedGlyphs	(	QFontEngine *	fontEngine,
		const QTransform &	m
	)		const

override

Returns whether glyph caching is supported by the given fontEngine with the transform m applied.

Type QRasterPaintEngine::type ( ) const

inlineoverridevirtual

Returns QPaintEngine::Type::Raster.

Implements QPaintEngine::type()

Friends And Related Function Documentation

typedef QSpan ( )

Public Methods

Related Functions

Detailed Description

Constructor & Destructor Documentation

Method Documentation

Friends And Related Function Documentation