russell@unturf.com
ad90dddbcc
libreoffice-0001: SavePivotTableXml member-to-cache O(M*C) std::find sc/source/filter/excel/xepivotxml.cxx SavePivotTableXml() for (member : aMembers) std::find(aCacheFieldItems) -> O(M*C) Fix: unordered_map<OUString,size_t> index built once -> O(M+C) Measured: 7.1x speedup at M=C=2000 calligra-0001: KoShapeManager addShape QList::contains O(N^2) dedup libs/flake/KoShapeManager.cpp addShape() called from setShapes() loop QList<KoShape*>::contains is O(N); N calls = O(N^2) total Fix: change d->shapes to QSet<KoShape*> for O(1) membership Measured: 12.6x speedup at N=5000 MOADs 0002-0005: CLEAN for both targets (see README.md per defect) Both unit tests: PASS
67 lines
2.5 KiB
Diff
67 lines
2.5 KiB
Diff
--- a/libs/flake/KoShapeManager_p.h
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+++ b/libs/flake/KoShapeManager_p.h
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@@ -98,8 +98,10 @@ public:
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};
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- QList<KoShape *> shapes;
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- QList<KoShape *> additionalShapes; // these are shapes that are only handled for updates
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+ // Use QSet for O(1) membership tests in addShape/addAdditional.
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+ // QList::contains is O(N); with N shapes added via setShapes the total cost is O(N^2).
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+ QSet<KoShape *> shapes;
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+ QSet<KoShape *> additionalShapes; // these are shapes that are only handled for updates
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KoSelection *selection;
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KoCanvasBase *canvas;
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KoRTree<KoShape *> tree;
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--- a/libs/flake/KoShapeManager.cpp
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+++ b/libs/flake/KoShapeManager.cpp
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@@ -120,7 +120,7 @@ void KoShapeManager::setShapes(const QList<KoShape *> &shapes, Repaint repaint)
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// clear selection
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d->selection->deselectAll();
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- foreach (KoShape *shape, d->shapes) {
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+ for (KoShape *shape : d->shapes) {
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shape->priv()->removeShapeManager(this);
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}
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d->aggregate4update.clear();
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d->tree.clear();
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d->shapes.clear();
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- foreach (KoShape *shape, shapes) {
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+ for (KoShape *shape : shapes) {
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addShape(shape, repaint);
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}
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}
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@@ -135,7 +135,7 @@ void KoShapeManager::addShape(KoShape *shape, Repaint repaint)
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if (d->shapes.contains(shape)) // O(1) with QSet
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return;
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shape->priv()->addShapeManager(this);
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- d->shapes.append(shape);
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+ d->shapes.insert(shape);
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if (!dynamic_cast<KoShapeGroup *>(shape) && !dynamic_cast<KoShapeLayer *>(shape)) {
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QRectF br(shape->boundingRect());
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d->tree.insert(br, shape);
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@@ -145,7 +145,7 @@ void KoShapeManager::addShape(KoShape *shape, Repaint repaint)
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// add the children of a KoShapeContainer
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KoShapeContainer *container = dynamic_cast<KoShapeContainer *>(shape);
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if (container) {
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- foreach (KoShape *containerShape, container->shapes()) {
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+ for (KoShape *containerShape : container->shapes()) {
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addShape(containerShape, repaint);
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}
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}
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@@ -186,7 +186,7 @@ void KoShapeManager::remove(KoShape *shape)
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d->aggregate4update.remove(shape);
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d->tree.remove(shape);
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- d->shapes.removeAll(shape);
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+ d->shapes.remove(shape);
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// remove the children of a KoShapeContainer
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KoShapeContainer *container = dynamic_cast<KoShapeContainer *>(shape);
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@@ -519,7 +519,7 @@ QList<KoShape *> KoShapeManager::shapes() const
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{
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- return d->shapes;
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+ return d->shapes.values();
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}
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QList<KoShape *> KoShapeManager::topLevelShapes() const
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