From 80e114ad0b7974894858a17153d6f54546835066 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B8rn=20Erik=20Nilsen?= Date: Wed, 3 Feb 2010 11:17:19 +0100 Subject: QGraphicsScene: Use QPainter::setClipRect instead of setClipPath if possible. Using QPainter::setClipPath results in complex (and slow) alphamasking so this must be avoided if possible. Task-number: QTBUG-7790 Reviewed-by: samuel --- src/gui/graphicsview/qgraphicsscene.cpp | 18 +++++++++++++++--- src/gui/painting/qpathclipper.cpp | 4 +--- src/gui/painting/qpathclipper_p.h | 2 ++ 3 files changed, 18 insertions(+), 6 deletions(-) diff --git a/src/gui/graphicsview/qgraphicsscene.cpp b/src/gui/graphicsview/qgraphicsscene.cpp index 842d368..4bfe9ad 100644 --- a/src/gui/graphicsview/qgraphicsscene.cpp +++ b/src/gui/graphicsview/qgraphicsscene.cpp @@ -251,6 +251,7 @@ #endif #include #include +#include // #define GESTURE_DEBUG #ifndef GESTURE_DEBUG @@ -4765,7 +4766,12 @@ void QGraphicsScenePrivate::draw(QGraphicsItem *item, QPainter *painter, const Q painter->setWorldTransform(*transformPtr * *effectTransform); else painter->setWorldTransform(*transformPtr); - painter->setClipPath(item->shape(), Qt::IntersectClip); + QRectF clipRect; + const QPainterPath clipPath(item->shape()); + if (QPathClipper::pathToRect(clipPath, &clipRect)) + painter->setClipRect(clipRect, Qt::IntersectClip); + else + painter->setClipPath(clipPath, Qt::IntersectClip); } // Draw children behind @@ -4801,8 +4807,14 @@ void QGraphicsScenePrivate::draw(QGraphicsItem *item, QPainter *painter, const Q painter->setWorldTransform(*transformPtr); } - if (itemClipsToShape) - painter->setClipPath(item->shape(), Qt::IntersectClip); + if (itemClipsToShape) { + QRectF clipRect; + const QPainterPath clipPath(item->shape()); + if (QPathClipper::pathToRect(clipPath, &clipRect)) + painter->setClipRect(clipRect, Qt::IntersectClip); + else + painter->setClipPath(clipPath, Qt::IntersectClip); + } painter->setOpacity(opacity); if (!item->d_ptr->cacheMode && !item->d_ptr->isWidget) diff --git a/src/gui/painting/qpathclipper.cpp b/src/gui/painting/qpathclipper.cpp index 7997e77..5702ede 100644 --- a/src/gui/painting/qpathclipper.cpp +++ b/src/gui/painting/qpathclipper.cpp @@ -90,8 +90,6 @@ static QPointF normalize(const QPointF &p) return p / qSqrt(p.x() * p.x() + p.y() * p.y()); } -static bool pathToRect(const QPainterPath &path, QRectF *rect = 0); - struct QIntersection { qreal alphaA; @@ -1660,7 +1658,7 @@ static bool fuzzyCompare(qreal a, qreal b) return qFuzzyCompare(a, b); } -static bool pathToRect(const QPainterPath &path, QRectF *rect) +bool QPathClipper::pathToRect(const QPainterPath &path, QRectF *rect) { if (path.elementCount() != 5) return false; diff --git a/src/gui/painting/qpathclipper_p.h b/src/gui/painting/qpathclipper_p.h index 0d2c049..b900862 100644 --- a/src/gui/painting/qpathclipper_p.h +++ b/src/gui/painting/qpathclipper_p.h @@ -86,6 +86,8 @@ public: bool intersect(); bool contains(); + static bool pathToRect(const QPainterPath &path, QRectF *rect = 0); + private: Q_DISABLE_COPY(QPathClipper) -- cgit v0.12