Make QStaticText layout lazy

To avoid the unnecessary overhead of doing the text layout every time
a part of the QStaticText object is changed, we mark it as invalid
instead and do the layout when we have to. This means an overhead on
the first paint event for most users. The overhead can be avoided by
using the QStaticText::prepare() function and will probably not be
noticable anyway, since it's a one-time thing.

Task-number: QTBUG-9030
Reviewed-by: Gunnar

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/painting/qpainter.cpp b/src/gui/painting/qpainter.cpp
index 7856881..93f2265 100644
--- a/src/gui/painting/qpainter.cpp
+++ b/src/gui/painting/qpainter.cpp
@@ -5864,7 +5864,7 @@ void QPainter::drawStaticText(const QPointF &topLeftPosition, const QStaticText
 
     // If the transform is not identical to the text transform,
     // we have to relayout the text (for other transformations than plain translation)
-    bool staticTextNeedsReinit = false;
+    bool staticTextNeedsReinit = staticText_d->needsRelayout;
     if (staticText_d->matrix != d->state->matrix) {
         staticText_d->matrix = d->state->matrix;
         staticTextNeedsReinit = true;