Add QPlatformIntegration::BackingStoreStaticContents capability

This was a feature in Qt 4, but the only platform that carried it over
to Qt 5 was Windows, in ab76593f18396e693f24066592244ca95e135ea2, and
that's still the situation.

As a first step in possibly implementing this on more platforms, lets
replace the hard-coded check in QWidgetRepaintManager::hasStaticContents
with a proper QPlatformIntegration capability check in the only call site.

Pick-to: 6.7
Change-Id: I2067109f45116cd8c62facf7224cd748f19e845b
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

1 files changed, 5 insertions, 3 deletions

diff --git a/tests/auto/gui/kernel/qbackingstore/tst_qbackingstore.cpp b/tests/auto/gui/kernel/qbackingstore/tst_qbackingstore.cpp
index 9fdf566988..8a3d61829a 100644
--- a/tests/auto/gui/kernel/qbackingstore/tst_qbackingstore.cpp
+++ b/tests/auto/gui/kernel/qbackingstore/tst_qbackingstore.cpp
@@ -4,6 +4,8 @@
 #include <qwindow.h>
 #include <qbackingstore.h>
 #include <qpa/qplatformbackingstore.h>
+#include <qpa/qplatformintegration.h>
+#include <private/qguiapplication_p.h>
 #include <qpainter.h>
 
 #include <QTest>
@@ -271,9 +273,9 @@ void tst_QBackingStore::flush()
 
 void tst_QBackingStore::staticContents()
 {
-#if !defined(Q_OS_WIN)
-    QSKIP("Platform does not support static backingstore content");
-#endif
+    const auto *integration = QGuiApplicationPrivate::platformIntegration();
+    if (!integration->hasCapability(QPlatformIntegration::BackingStoreStaticContents))
+        QSKIP("Platform does not support static backingstore content");
 
     QWindow window;
     window.create();