QPixmapBlurFilter Class
The QPixmapBlurFilter class provides blur filtering for pixmaps. More...
Header: | #include <QPixmapBlurFilter> |
Inherits: | QPixmapFilter |
Public Functions
QPixmapBlurFilter(QObject *parent = nullptr) | |
virtual | ~QPixmapBlurFilter() |
QGraphicsBlurEffect::BlurHints | blurHints() const |
qreal | radius() const |
void | setBlurHints(QGraphicsBlurEffect::BlurHints hints) |
void | setRadius(qreal radius) |
Reimplemented Public Functions
virtual QRectF | boundingRectFor(const QRectF &rect) const override |
virtual void | draw(QPainter *painter, const QPointF &p, const QPixmap &src, const QRectF &rect = QRectF()) const override |
Detailed Description
\since
4.6 \ingroup
multimedia
QPixmapBlurFilter implements a blur pixmap filter, which is applied when draw() is called.
The filter lets you specialize the radius of the blur as well as hints as to whether to prefer performance or quality.
By default, the blur effect is produced by applying an exponential filter generated from the specified blurRadius(). Paint engines may override this with a custom blur that is faster on the underlying hardware.
\internal
See also Pixmap Filters Example, QPixmapConvolutionFilter, and QPixmapDropShadowFilter.
Member Function Documentation
QPixmapBlurFilter::QPixmapBlurFilter(QObject *parent = nullptr)
Constructs a pixmap blur filter.
\internal
[virtual noexcept]
QPixmapBlurFilter::~QPixmapBlurFilter()
Destructor of pixmap blur filter.
\internal
QGraphicsBlurEffect::BlurHints QPixmapBlurFilter::blurHints() const
Gets the blur hints of the blur filter.
\internal
See also setBlurHints().
[override virtual]
QRectF QPixmapBlurFilter::boundingRectFor(const QRectF &rect) const
Reimplements: QPixmapFilter::boundingRectFor(const QRectF &rect) const.
\internal
[override virtual]
void QPixmapBlurFilter::draw(QPainter *painter, const QPointF &p, const QPixmap &src, const QRectF &rect = QRectF()) const
\internal
qreal QPixmapBlurFilter::radius() const
Gets the radius of the blur filter.
\internal
See also setRadius().
void QPixmapBlurFilter::setBlurHints(QGraphicsBlurEffect::BlurHints hints)
Setting the blur hints to PerformanceHint causes the implementation to trade off visual quality to blur the image faster. Setting the blur hints to QualityHint causes the implementation to improve visual quality at the expense of speed.
AnimationHint causes the implementation to optimize for animating the blur radius, possibly by caching blurred versions of the source pixmap.
The implementation is free to ignore this value if it only has a single blur algorithm.
\internal
See also blurHints().
void QPixmapBlurFilter::setRadius(qreal radius)
Sets the radius of the blur filter. Higher radius produces increased blurriness.
\internal
See also radius().