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QMacStyle: Minimize size of scrollbar transparency layer

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Instead of allocating the full backing store size for
the transparency layer, we make sure we only allocate
exactly as much as needed by the scrollbar.

Change-Id: I55c3172fe3dd2a1f3fd46828463497f9f35cb1ae
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
This commit is contained in:
Gabriel de Dietrich 2017-12-20 17:14:18 -08:00 committed by Liang Qi
parent e3c79b4356
commit c5a3022b04
1 changed files with 1 additions and 1 deletions
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2
src/plugins/styles/mac/qmacstyle_mac.mm
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@ -5190,7 +5190,7 @@ void QMacStyle::drawComplexControl(ComplexControl cc, const QStyleOptionComplex
break;
if (isTransient) {
CGContextBeginTransparencyLayer(cg, NULL);
CGContextBeginTransparencyLayerWithRect(cg, scroller.frame, nullptr);
CGContextSetAlpha(cg, opacity);
}