1 files changed, 11 insertions, 11 deletions
diff --git a/src/plugins/platforms/winrt/qwinrtbackingstore.cpp b/src/plugins/platforms/winrt/qwinrtbackingstore.cpp
index 113886f9b4..c23d48b2dd 100644
--- a/src/plugins/platforms/winrt/qwinrtbackingstore.cpp
+++ b/src/plugins/platforms/winrt/qwinrtbackingstore.cpp
@@ -50,9 +50,6 @@
 
 QT_BEGIN_NAMESPACE
 
-Q_LOGGING_CATEGORY(lcQpaBackingStore, "qt.qpa.backingstore")
-Q_LOGGING_CATEGORY(lcQpaBackingStoreVerbose, "qt.qpa.backingstore.verbose")
-
 class QWinRTBackingStorePrivate
 {
 public:
@@ -68,7 +65,7 @@ QWinRTBackingStore::QWinRTBackingStore(QWindow *window)
     : QPlatformBackingStore(window), d_ptr(new QWinRTBackingStorePrivate)
 {
     Q_D(QWinRTBackingStore);
-    qCDebug(lcQpaBackingStore) << __FUNCTION__ << this << window;
+    qCInfo(lcQpaBackingStore) << __FUNCTION__ << this << window;
 
     d->initialized = false;
     d->screen = static_cast<QWinRTScreen*>(window->screen()->handle());
@@ -80,7 +77,7 @@ QWinRTBackingStore::QWinRTBackingStore(QWindow *window)
 bool QWinRTBackingStore::initialize()
 {
     Q_D(QWinRTBackingStore);
-    qCDebug(lcQpaBackingStoreVerbose) << __FUNCTION__ << d->initialized;
+    qCDebug(lcQpaBackingStore) << __FUNCTION__ << d->initialized;
 
     if (d->initialized)
         return true;
@@ -102,7 +99,7 @@ bool QWinRTBackingStore::initialize()
 
 QWinRTBackingStore::~QWinRTBackingStore()
 {
-    qCDebug(lcQpaBackingStore) << __FUNCTION__ << this;
+    qCInfo(lcQpaBackingStore) << __FUNCTION__ << this;
 }
 
 QPaintDevice *QWinRTBackingStore::paintDevice()
@@ -116,16 +113,19 @@ void QWinRTBackingStore::flush(QWindow *window, const QRegion &region, const QPo
     Q_D(QWinRTBackingStore);
     Q_UNUSED(offset)
 
-    qCDebug(lcQpaBackingStoreVerbose) << __FUNCTION__ << this << window << region;
+    qCDebug(lcQpaBackingStore) << __FUNCTION__ << this << window << region;
 
     if (d->size.isEmpty())
         return;
 
+    const QRect bounds = region.boundingRect() & d->paintDevice.rect();
+    if (bounds.isEmpty())
+        return;
+
     const bool ok = d->context->makeCurrent(window);
     if (!ok)
         qWarning("unable to flush");
 
-    const QRect bounds = region.boundingRect();
     glBindTexture(GL_TEXTURE_2D, d->fbo->texture());
     // TODO: when ANGLE GLES3 support is finished, use the glPixelStorei functions to minimize upload
     glTexSubImage2D(GL_TEXTURE_2D, 0, 0, bounds.y(), d->size.width(), bounds.height(),
@@ -151,7 +151,7 @@ void QWinRTBackingStore::resize(const QSize &size, const QRegion &staticContents
     Q_D(QWinRTBackingStore);
     Q_UNUSED(staticContents)
 
-    qCDebug(lcQpaBackingStoreVerbose) << __FUNCTION__ << this << size;
+    qCDebug(lcQpaBackingStore) << __FUNCTION__ << this << size;
 
     if (!initialize())
         return;
@@ -182,14 +182,14 @@ QImage QWinRTBackingStore::toImage() const
 
 void QWinRTBackingStore::beginPaint(const QRegion &region)
 {
-    qCDebug(lcQpaBackingStoreVerbose) << __FUNCTION__ << this << region;
+    qCDebug(lcQpaBackingStore) << __FUNCTION__ << this << region;
 
     resize(window()->size(), region);
 }
 
 void QWinRTBackingStore::endPaint()
 {
-    qCDebug(lcQpaBackingStoreVerbose) << __FUNCTION__ << this;
+    qCDebug(lcQpaBackingStore) << __FUNCTION__ << this;
 }
 
 QT_END_NAMESPACE