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| author | Samuel Rødal <sroedal@trolltech.com> | 2010-04-22 07:58:03 (GMT) |
|---|---|---|
| committer | Samuel Rødal <sroedal@trolltech.com> | 2010-04-22 09:28:56 (GMT) |
| commit | f7d61dab69308f0993c8a5f2232226d1713ac4a7 (patch) | |
| tree | 82d85d2353030719ee078b1f0ae9d4e0ad34366d /src/gui/painting/qpainterpath.cpp | |
| parent | 7dc1d86ef4fd365483dec83b7cafff06521bf8eb (diff) | |
| download | Qt-f7d61dab69308f0993c8a5f2232226d1713ac4a7.zip Qt-f7d61dab69308f0993c8a5f2232226d1713ac4a7.tar.gz Qt-f7d61dab69308f0993c8a5f2232226d1713ac4a7.tar.bz2 | |
Removed bezier intersection code in path clipper.
The bezier intersections caused a lot of numerical stability issues, so
instead we now convert them to line segments. In the future it might be
possible to keep track of which bezier curve a line segment originated
from and reconstruct the bezier curves at the end.
Task-number: QTBUG-8035
Reviewed-by: Gunnar Sletta
Diffstat (limited to 'src/gui/painting/qpainterpath.cpp')
| -rw-r--r-- | src/gui/painting/qpainterpath.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/gui/painting/qpainterpath.cpp b/src/gui/painting/qpainterpath.cpp index 965b84c..f5a698e 100644 --- a/src/gui/painting/qpainterpath.cpp +++ b/src/gui/painting/qpainterpath.cpp @@ -3167,6 +3167,8 @@ void QPainterPath::addRoundRect(const QRectF &r, int xRnd, int yRnd) Set operations on paths will treat the paths as areas. Non-closed paths will be treated as implicitly closed. + Bezier curves may be flattened to line segments due to numerical instability of + doing bezier curve intersections. \sa intersected(), subtracted() */ @@ -3182,6 +3184,8 @@ QPainterPath QPainterPath::united(const QPainterPath &p) const \since 4.3 Returns a path which is the intersection of this path's fill area and \a p's fill area. + Bezier curves may be flattened to line segments due to numerical instability of + doing bezier curve intersections. */ QPainterPath QPainterPath::intersected(const QPainterPath &p) const { @@ -3198,7 +3202,8 @@ QPainterPath QPainterPath::intersected(const QPainterPath &p) const Set operations on paths will treat the paths as areas. Non-closed paths will be treated as implicitly closed. - + Bezier curves may be flattened to line segments due to numerical instability of + doing bezier curve intersections. */ QPainterPath QPainterPath::subtracted(const QPainterPath &p) const { @@ -3227,6 +3232,8 @@ QPainterPath QPainterPath::subtractedInverted(const QPainterPath &p) const Returns a simplified version of this path. This implies merging all subpaths that intersect, and returning a path containing no intersecting edges. Consecutive parallel lines will also be merged. The simplified path will always use the default fill rule, Qt::OddEvenFill. + Bezier curves may be flattened to line segments due to numerical instability of + doing bezier curve intersections. */ QPainterPath QPainterPath::simplified() const { |