diff options
Diffstat (limited to 'src/gui/effects/qgraphicseffect.cpp')
| -rw-r--r-- | src/gui/effects/qgraphicseffect.cpp | 269 |
1 files changed, 244 insertions, 25 deletions
diff --git a/src/gui/effects/qgraphicseffect.cpp b/src/gui/effects/qgraphicseffect.cpp index eee9bbf..e971fd8 100644 --- a/src/gui/effects/qgraphicseffect.cpp +++ b/src/gui/effects/qgraphicseffect.cpp @@ -67,6 +67,7 @@ \o QGraphicsOpacityEffect - renders the item with an opacity \o QGraphicsPixelizeEffect - pixelizes the item with any pixel size \o QGraphicsGrayscaleEffect - renders the item in shades of gray + \o QGraphicsBloomEffect - applies a blooming / glowing effect \endlist \img graphicseffect-effects.png @@ -795,7 +796,7 @@ QGraphicsBlurEffect::QGraphicsBlurEffect(QObject *parent) : QGraphicsEffect(*new QGraphicsBlurEffectPrivate, parent) { Q_D(QGraphicsBlurEffect); - d->filter->setBlurHint(QPixmapBlurFilter::PerformanceHint); + d->filter->setBlurHint(Qt::PerformanceHint); } /*! @@ -839,48 +840,34 @@ void QGraphicsBlurEffect::setBlurRadius(int radius) */ /*! - \enum QGraphicsBlurEffect::BlurHint - - \since 4.6 - - This enum describes the hint of a blur graphics effect. - - \value PerformanceHint Using this value hints that performance is the - most important factor, at the potential cost of lower quality. - - \value QualityHint Using this value hints that a higher quality blur is - preferred over a fast blur. -*/ - -/*! \property QGraphicsBlurEffect::blurHint \brief the blur hint of the effect. - Use the PerformanceHint blur hint to say that you want a faster blur, - and the QualityHint blur hint to say that you prefer a higher quality blur. + Use the Qt::PerformanceHint hint to say that you want a faster blur, + and the Qt::QualityHint hint to say that you prefer a higher quality blur. - When animating the blur radius it's recommended to use the PerformanceHint. + When animating the blur radius it's recommended to use Qt::PerformanceHint. - By default, the blur hint is PerformanceHint. + By default, the blur hint is Qt::PerformanceHint. */ -QGraphicsBlurEffect::BlurHint QGraphicsBlurEffect::blurHint() const +Qt::RenderHint QGraphicsBlurEffect::blurHint() const { Q_D(const QGraphicsBlurEffect); - return BlurHint(d->filter->blurHint()); + return d->filter->blurHint(); } -void QGraphicsBlurEffect::setBlurHint(QGraphicsBlurEffect::BlurHint hint) +void QGraphicsBlurEffect::setBlurHint(Qt::RenderHint hint) { Q_D(QGraphicsBlurEffect); - if (BlurHint(d->filter->blurHint()) == hint) + if (d->filter->blurHint() == hint) return; - d->filter->setBlurHint(QPixmapBlurFilter::BlurHint(hint)); + d->filter->setBlurHint(hint); emit blurHintChanged(hint); } /*! - \fn void QGraphicsBlurEffect::blurHintChanged(QGraphicsBlurEffect::BlurHint hint) + \fn void QGraphicsBlurEffect::blurHintChanged(Qt::RenderHint hint) This signal is emitted whenever the effect's blur hint changes. The \a hint parameter holds the effect's new blur hint. @@ -1305,5 +1292,237 @@ void QGraphicsOpacityEffect::draw(QPainter *painter, QGraphicsEffectSource *sour painter->restore(); } +/*! + \class QGraphicsBloomEffect + \brief The QGraphicsBloomEffect class provides a bloom/glow effect. + \since 4.6 + + A bloom/glow effect adds fringes of light around bright areas in the source. + + \img graphicseffect-bloom.png + + \sa QGraphicsDropShadowEffect, QGraphicsBlurEffect, QGraphicsPixelizeEffect, + QGraphicsGrayscaleEffect, QGraphicsColorizeEffect +*/ + +/*! + Constructs a new QGraphicsBloomEffect instance. + The \a parent parameter is passed to QGraphicsEffect's constructor. +*/ +QGraphicsBloomEffect::QGraphicsBloomEffect(QObject *parent) + : QGraphicsEffect(*new QGraphicsBloomEffectPrivate, parent) +{ + Q_D(QGraphicsBloomEffect); + for (int i = 0; i < 256; ++i) + d->colorTable[i] = qMin(i + d->brightness, 255); +} + +/*! + Destroys the effect. +*/ +QGraphicsBloomEffect::~QGraphicsBloomEffect() +{ +} + +/*! + \reimp +*/ +QRectF QGraphicsBloomEffect::boundingRectFor(const QRectF &rect) const +{ + Q_D(const QGraphicsBloomEffect); + const qreal delta = d->blurFilter.radius() * 2; + return rect.adjusted(-delta, -delta, delta, delta); +} + +/*! + \property QGraphicsBloomEffect::blurRadius + \brief the blur radius in pixels of the effect. + + Using a smaller radius results in a sharper appearance, whereas a bigger + radius results in a more blurred appearance. + + By default, the blur radius is 5 pixels. + + \sa strength(), brightness() +*/ +int QGraphicsBloomEffect::blurRadius() const +{ + Q_D(const QGraphicsBloomEffect); + return d->blurFilter.radius(); +} + +void QGraphicsBloomEffect::setBlurRadius(int radius) +{ + Q_D(QGraphicsBloomEffect); + if (d->blurFilter.radius() == radius) + return; + + d->blurFilter.setRadius(radius); + updateBoundingRect(); + emit blurRadiusChanged(radius); +} + +/*! + \fn void QGraphicsBloomEffect::blurRadiusChanged(int blurRadius) + + This signal is emitted whenever the effect's blur radius changes. + The \a blurRadius parameter holds the effect's new blur radius. +*/ + +/*! + \property QGraphicsBloomEffect::blurHint + \brief the blur hint of the effect. + + Use the Qt::PerformanceHint hint to say that you want a faster blur, + and the Qt::QualityHint hint to say that you prefer a higher quality blur. + + When animating the blur radius it's recommended to use Qt::PerformanceHint. + + By default, the blur hint is Qt::PerformanceHint. +*/ +Qt::RenderHint QGraphicsBloomEffect::blurHint() const +{ + Q_D(const QGraphicsBloomEffect); + return d->blurFilter.blurHint(); +} + +void QGraphicsBloomEffect::setBlurHint(Qt::RenderHint hint) +{ + Q_D(QGraphicsBloomEffect); + if (d->blurFilter.blurHint() == hint) + return; + + d->blurFilter.setBlurHint(hint); + emit blurHintChanged(hint); +} + +/*! + \fn void QGraphicsBloomEffect::blurHintChanged(Qt::RenderHint hint) + + This signal is emitted whenever the effect's blur hint changes. + The \a hint parameter holds the effect's new blur hint. +*/ + +/*! + \property QGraphicsBloomEffect::brightness + \brief the brightness of the glow. + + The value should be in the range of 0 to 255, where 0 is dark + and 255 is bright. + + By default, the brightness is 70. + + \sa strength(), blurRadius() +*/ +int QGraphicsBloomEffect::brightness() const +{ + Q_D(const QGraphicsBloomEffect); + return d->brightness; +} + +void QGraphicsBloomEffect::setBrightness(int brightness) +{ + Q_D(QGraphicsBloomEffect); + brightness = qBound(0, brightness, 255); + if (d->brightness == brightness) + return; + + d->brightness = brightness; + for (int i = 0; i < 256; ++i) + d->colorTable[i] = qMin(i + brightness, 255); + + update(); + emit brightnessChanged(brightness); +} + +/*! + \fn void QGraphicsBloomEffect::brightnessChanged(int brightness) + + This signal is emitted whenever the effect's brightness changes. + The \a brightness parameter holds the effect's new brightness. +*/ + +/*! + \property QGraphicsBloomEffect::strength + \brief the strength of the effect. + + A strength 0.0 equals to no effect, while 1.0 means maximum glow. + + By default, the strength is 0.7. +*/ +qreal QGraphicsBloomEffect::strength() const +{ + Q_D(const QGraphicsBloomEffect); + return d->strength; +} + +void QGraphicsBloomEffect::setStrength(qreal strength) +{ + Q_D(QGraphicsBloomEffect); + strength = qBound(qreal(0.0), strength, qreal(1.0)); + if (qFuzzyCompare(d->strength, strength)) + return; + + d->strength = strength; + update(); + emit strengthChanged(strength); +} + +/*! + \fn void QGraphicsBloomEffect::strengthChanged(qreal strength) + + This signal is emitted whenever the effect's strength changes. + The \a strength parameter holds the effect's new strength. +*/ + +/*! + \reimp +*/ +void QGraphicsBloomEffect::draw(QPainter *painter, QGraphicsEffectSource *source) +{ + Q_D(QGraphicsBloomEffect); + if (d->strength < 0.001) { + source->draw(painter); + return; + } + + const Qt::CoordinateSystem system = source->isPixmap() + ? Qt::LogicalCoordinates : Qt::DeviceCoordinates; + QPoint offset; + QPixmap pixmap = source->pixmap(system, &offset); + QImage result = pixmap.toImage().convertToFormat(QImage::Format_ARGB32_Premultiplied); + + // Blur. + QPainter blurPainter(&pixmap); + d->blurFilter.draw(&blurPainter, QPointF(), pixmap); + blurPainter.end(); + + // Brighten. + QImage overlay = pixmap.toImage().convertToFormat(QImage::Format_ARGB32); + const int numBits = overlay.width() * overlay.height(); + QRgb *bits = reinterpret_cast<QRgb *>(overlay.bits()); + for (int i = 0; i < numBits; ++i) { + const QRgb bit = bits[i]; + bits[i] = qRgba(d->colorTable[qRed(bit)], d->colorTable[qGreen(bit)], + d->colorTable[qBlue(bit)], qAlpha(bit)); + } + + // Composite. + QPainter compPainter(&result); + compPainter.setCompositionMode(QPainter::CompositionMode_Overlay); + compPainter.setOpacity(d->strength); + compPainter.drawImage(0, 0, overlay); + compPainter.end(); + + if (system == Qt::DeviceCoordinates) { + QTransform restoreTransform = painter->worldTransform(); + painter->setWorldTransform(QTransform()); + painter->drawImage(offset, result); + painter->setWorldTransform(restoreTransform); + } else { + painter->drawImage(offset, result); + } +} + QT_END_NAMESPACE |