diff options
Diffstat (limited to 'src/gui/effects')
| -rw-r--r-- | src/gui/effects/qgraphicseffect.cpp | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/gui/effects/qgraphicseffect.cpp b/src/gui/effects/qgraphicseffect.cpp index 239e29c..d6cabaa 100644 --- a/src/gui/effects/qgraphicseffect.cpp +++ b/src/gui/effects/qgraphicseffect.cpp @@ -160,6 +160,10 @@ QRectF QGraphicsEffectSource::boundingRect(Qt::CoordinateSystem system) const /*! Returns the bounding rectangle of the source mapped to the given \a system. + Calling this function with Qt::DeviceCoordinates outside of + QGraphicsEffect::draw() will give undefined results, as there is no device + context available. + \sa draw() */ QRectF QGraphicsEffect::sourceBoundingRect(Qt::CoordinateSystem system) const @@ -348,6 +352,10 @@ QPixmap QGraphicsEffectSource::pixmap(Qt::CoordinateSystem system, QPoint *offse The returned pixmap is clipped to the current painter's device rectangle when \a system is Qt::DeviceCoordinates. + Calling this function with Qt::DeviceCoordinates outside of + QGraphicsEffect::draw() will give undefined results, as there is no device + context available. + \sa draw(), boundingRect() */ QPixmap QGraphicsEffect::sourcePixmap(Qt::CoordinateSystem system, QPoint *offset, QGraphicsEffect::PixmapPadMode mode) const @@ -398,8 +406,8 @@ QGraphicsEffect::~QGraphicsEffect() /*! Returns the effective bounding rectangle for this effect, i.e., the - bounding rectangle of the source, adjusted by any margins applied by - the effect itself. + bounding rectangle of the source in device coordinates, adjusted by + any margins applied by the effect itself. \sa boundingRectFor(), updateBoundingRect() */ @@ -413,7 +421,7 @@ QRectF QGraphicsEffect::boundingRect() const /*! Returns the effective bounding rectangle for this effect, given the - provided \a rect in the source's coordinate space. When writing + provided \a rect in the device coordinates. When writing you own custom effect, you must call updateBoundingRect() whenever any parameters are changed that may cause this this function to return a different value. |