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macOS: Don't blend the backingstore unless the window has a background

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If there's no background, we should copy the backingstore, so that the
backingstore is not blended with the result of the previous flush.

The unified toolbar case is covered by the window having a textured
background.

Task-number: QTBUG-69773
Change-Id: I2f4eed9f44a60ebe7495ce68cf5a54d3d2424b0c
Reviewed-by: Erik Verbruggen <erik.verbruggen@qt.io>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
This commit is contained in:
Tor Arne Vestbø 2018-08-06 17:05:30 +02:00
parent 3068b185c5
commit bedf50a5bb
1 changed files with 5 additions and 5 deletions
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10
src/plugins/platforms/cocoa/qcocoabackingstore.mm
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@ -162,13 +162,13 @@ void QCocoaBackingStore::flush(QWindow *window, const QRegion &region, const QPo
const qreal devicePixelRatio = m_image.devicePixelRatio();
// If the flushed window is a content view, and not in unified toolbar mode,
// and is fully opaque, we can get away with copying the backingstore instead
// of blending.
// If the flushed window is a content view, and we're filling the drawn area
// completely, or it doesn't have a window background we need to preserve,
// we can get away with copying instead of blending the backing store.
QCocoaWindow *cocoaWindow = static_cast<QCocoaWindow *>(window->handle());
const NSCompositingOperation compositingOperation = cocoaWindow->isContentView()
&& cocoaWindow->isOpaque() && !windowHasUnifiedToolbar() ?
NSCompositingOperationCopy : NSCompositingOperationSourceOver;
&& (cocoaWindow->isOpaque() || view.window.backgroundColor == NSColor.clearColor)
? NSCompositingOperationCopy : NSCompositingOperationSourceOver;
#ifdef QT_DEBUG
static bool debugBackingStoreFlush = [[NSUserDefaults standardUserDefaults]