Use reserve on QVector<Phase2Data>
Summary: We know that the maximum size is the number of windows in stacking order. It might be that some are skipped as they are not ready for painting, but overall it's better to reserve a little bit too much memory than to have a growing QVector. Test Plan: Compiles Reviewers: #kwin Subscribers: kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D18208icc-effect-5.17.5
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@ -207,6 +207,7 @@ void Scene::paintGenericScreen(int orig_mask, ScreenPaintData)
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paintBackground(infiniteRegion());
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}
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QVector<Phase2Data> phase2;
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phase2.reserve(stacking_order.size());
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foreach (Window * w, stacking_order) { // bottom to top
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Toplevel* topw = w->window();
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@ -250,6 +251,7 @@ void Scene::paintSimpleScreen(int orig_mask, QRegion region)
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assert((orig_mask & (PAINT_SCREEN_TRANSFORMED
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| PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS)) == 0);
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QVector<Phase2Data> phase2data;
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phase2data.reserve(stacking_order.size());
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QRegion dirtyArea = region;
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bool opaqueFullscreen(false);
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