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| author | Bjoern Erik Nilsen <bjorn.nilsen@nokia.com> | 2009-04-29 15:33:10 (GMT) |
|---|---|---|
| committer | Bjoern Erik Nilsen <bjorn.nilsen@nokia.com> | 2009-04-29 15:56:11 (GMT) |
| commit | 5969625334270892e39b6b43f4da735b830abdbe (patch) | |
| tree | 65a3873020f512051753768d9d96756402a672e0 /src/gui/painting/qpainter.cpp | |
| parent | 5a9623cb54c598aa4226883076fb413ef88215e5 (diff) | |
| download | Qt-5969625334270892e39b6b43f4da735b830abdbe.zip Qt-5969625334270892e39b6b43f4da735b830abdbe.tar.gz Qt-5969625334270892e39b6b43f4da735b830abdbe.tar.bz2 | |
Speed-up QPainter::clipRegion().
We can speed up the calculation by using rect intersections
if possible, i.e. QRegion &= QRect instead of QRegion &= QRegion.
Then we'll get rid of one QRegion construction and the intersection
itself is slightly faster.
Reviewed-by: Samuel
Diffstat (limited to 'src/gui/painting/qpainter.cpp')
| -rw-r--r-- | src/gui/painting/qpainter.cpp | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/src/gui/painting/qpainter.cpp b/src/gui/painting/qpainter.cpp index 65d87fa..759bd7e 100644 --- a/src/gui/painting/qpainter.cpp +++ b/src/gui/painting/qpainter.cpp @@ -2398,7 +2398,6 @@ QRegion QPainter::clipRegion() const // ### Falcon: Use QPainterPath for (int i=0; i<d->state->clipInfo.size(); ++i) { const QPainterClipInfo &info = d->state->clipInfo.at(i); - QRegion other; switch (info.clipType) { case QPainterClipInfo::RegionClip: { @@ -2451,15 +2450,20 @@ QRegion QPainter::clipRegion() const lastWasNothing = false; continue; } - if (info.operation == Qt::IntersectClip) - region &= QRegion(info.rect) * matrix; - else if (info.operation == Qt::UniteClip) + if (info.operation == Qt::IntersectClip) { + // Use rect intersection if possible. + if (matrix.type() <= QTransform::TxScale) + region &= matrix.mapRect(info.rect); + else + region &= matrix.map(QRegion(info.rect)); + } else if (info.operation == Qt::UniteClip) { region |= QRegion(info.rect) * matrix; - else if (info.operation == Qt::NoClip) { + } else if (info.operation == Qt::NoClip) { lastWasNothing = true; region = QRegion(); - } else + } else { region = QRegion(info.rect) * matrix; + } break; } @@ -2470,15 +2474,20 @@ QRegion QPainter::clipRegion() const lastWasNothing = false; continue; } - if (info.operation == Qt::IntersectClip) - region &= QRegion(info.rectf.toRect()) * matrix; - else if (info.operation == Qt::UniteClip) + if (info.operation == Qt::IntersectClip) { + // Use rect intersection if possible. + if (matrix.type() <= QTransform::TxScale) + region &= matrix.mapRect(info.rectf.toRect()); + else + region &= matrix.map(QRegion(info.rectf.toRect())); + } else if (info.operation == Qt::UniteClip) { region |= QRegion(info.rectf.toRect()) * matrix; - else if (info.operation == Qt::NoClip) { + } else if (info.operation == Qt::NoClip) { lastWasNothing = true; region = QRegion(); - } else + } else { region = QRegion(info.rectf.toRect()) * matrix; + } break; } } |