Merge remote-tracking branch 'origin/5.14' into 5.15

 Conflicts:
	src/corelib/serialization/qcborvalue.cpp

Change-Id: I539d8cae5fd413b8a6c9c5d8a6364c79c8133a0a

6 files changed, 163 insertions, 72 deletions

diff --git a/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp b/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp
index e8f13b388f..9ece77ecbc 100644
--- a/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp
+++ b/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp
@@ -845,7 +845,7 @@ EGLint SwapChain11::copyOffscreenToBackbuffer(const gl::Context *context,
     stateManager->setRenderTarget(mBackBufferRTView.get(), nullptr);
 
     // Set the viewport
-    stateManager->setSimpleViewport(mWidth, mHeight);
+    stateManager->setSimpleViewport(width, height);
 
     // Apply textures
     stateManager->setSimplePixelTextureAndSampler(mOffscreenSRView, mPassThroughSampler);
diff --git a/src/angle/patches/0017-ANGLE-Fix-resizing-of-windows-Take-2.patch b/src/angle/patches/0017-ANGLE-Fix-resizing-of-windows-Take-2.patch
new file mode 100644
index 0000000000..abab74b192
--- /dev/null
+++ b/src/angle/patches/0017-ANGLE-Fix-resizing-of-windows-Take-2.patch
@@ -0,0 +1,27 @@
+From 029d42d1049dcde7950c11fb9adf07c07a8c4c02 Mon Sep 17 00:00:00 2001
+From: Oliver Wolff <oliver.wolff@qt.io>
+Date: Wed, 18 Mar 2020 10:56:53 +0100
+Subject: [PATCH] ANGLE: Fix resizing of windows (Take 2)
+
+Task-number: QTBUG-62475
+Change-Id: I0ea17e7875906508941ae64bb396a4236928b0f9
+---
+ .../angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp       | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp b/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp
+index e8f13b388f..9ece77ecbc 100644
+--- a/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp
++++ b/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp
+@@ -845,7 +845,7 @@ EGLint SwapChain11::copyOffscreenToBackbuffer(const gl::Context *context,
+     stateManager->setRenderTarget(mBackBufferRTView.get(), nullptr);
+ 
+     // Set the viewport
+-    stateManager->setSimpleViewport(mWidth, mHeight);
++    stateManager->setSimpleViewport(width, height);
+ 
+     // Apply textures
+     stateManager->setSimplePixelTextureAndSampler(mOffscreenSRView, mPassThroughSampler);
+-- 
+2.20.1.windows.1
+
diff --git a/src/corelib/serialization/qcborvalue.cpp b/src/corelib/serialization/qcborvalue.cpp
index db2840704c..98161094ae 100644
--- a/src/corelib/serialization/qcborvalue.cpp
+++ b/src/corelib/serialization/qcborvalue.cpp
@@ -844,11 +844,6 @@ static QCborValue::Type convertToExtendedType(QCborContainerPrivate *d)
     return QCborValue::Tag;
 }
 
-#if QT_CONFIG(cborstreamreader)
-// in qcborstream.cpp
-extern void qt_cbor_stream_set_error(QCborStreamReaderPrivate *d, QCborError error);
-#endif
-
 #if QT_CONFIG(cborstreamwriter)
 static void writeDoubleToCbor(QCborStreamWriter &writer, double d, QCborValue::EncodingOptions opt)
 {
@@ -1462,23 +1457,59 @@ static Element decodeBasicValueFromCbor(QCborStreamReader &reader)
     return e;
 }
 
-static inline QCborContainerPrivate *createContainerFromCbor(QCborStreamReader &reader)
+static inline QCborContainerPrivate *createContainerFromCbor(QCborStreamReader &reader, int remainingRecursionDepth)
 {
-    auto d = new QCborContainerPrivate;
-    d->ref.storeRelaxed(1);
-    d->decodeFromCbor(reader);
+    if (Q_UNLIKELY(remainingRecursionDepth == 0)) {
+        QCborContainerPrivate::setErrorInReader(reader, { QCborError::NestingTooDeep });
+        return nullptr;
+    }
+
+    QCborContainerPrivate *d = nullptr;
+    int mapShift = reader.isMap() ? 1 : 0;
+    if (reader.isLengthKnown()) {
+        quint64 len = reader.length();
+
+        // Clamp allocation to 1M elements (avoids crashing due to corrupt
+        // stream or loss of precision when converting from quint64 to
+        // QVector::size_type).
+        len = qMin(len, quint64(1024 * 1024 - 1));
+        if (len) {
+            d = new QCborContainerPrivate;
+            d->ref.storeRelaxed(1);
+            d->elements.reserve(qsizetype(len) << mapShift);
+        }
+    } else {
+        d = new QCborContainerPrivate;
+        d->ref.storeRelaxed(1);
+    }
+
+    reader.enterContainer();
+    if (reader.lastError() != QCborError::NoError)
+        return d;
+
+    while (reader.hasNext() && reader.lastError() == QCborError::NoError)
+        d->decodeValueFromCbor(reader, remainingRecursionDepth - 1);
+
+    if (reader.lastError() == QCborError::NoError)
+        reader.leaveContainer();
+
     return d;
 }
 
-static QCborValue taggedValueFromCbor(QCborStreamReader &reader)
+static QCborValue taggedValueFromCbor(QCborStreamReader &reader, int remainingRecursionDepth)
 {
+    if (Q_UNLIKELY(remainingRecursionDepth == 0)) {
+        QCborContainerPrivate::setErrorInReader(reader, { QCborError::NestingTooDeep });
+        return QCborValue::Invalid;
+    }
+
     auto d = new QCborContainerPrivate;
     d->append(reader.toTag());
     reader.next();
 
     if (reader.lastError() == QCborError::NoError) {
         // decode tagged value
-        d->decodeValueFromCbor(reader);
+        d->decodeValueFromCbor(reader, remainingRecursionDepth - 1);
     }
 
     QCborValue::Type type;
@@ -1494,6 +1525,13 @@ static QCborValue taggedValueFromCbor(QCborStreamReader &reader)
     return QCborContainerPrivate::makeValue(type, -1, d);
 }
 
+// in qcborstream.cpp
+extern void qt_cbor_stream_set_error(QCborStreamReaderPrivate *d, QCborError error);
+inline void QCborContainerPrivate::setErrorInReader(QCborStreamReader &reader, QCborError error)
+{
+    qt_cbor_stream_set_error(reader.d.data(), error);
+}
+
 void QCborContainerPrivate::decodeStringFromCbor(QCborStreamReader &reader)
 {
     auto addByteData_local = [this](QByteArray::size_type len) -> qint64 {
@@ -1538,7 +1576,7 @@ void QCborContainerPrivate::decodeStringFromCbor(QCborStreamReader &reader)
         return;                     // error
     if (len != rawlen) {
         // truncation
-        qt_cbor_stream_set_error(reader.d.data(), { QCborError::DataTooLarge });
+        setErrorInReader(reader, { QCborError::DataTooLarge });
         return;
     }
 
@@ -1548,7 +1586,7 @@ void QCborContainerPrivate::decodeStringFromCbor(QCborStreamReader &reader)
         e.value = addByteData_local(len);
         if (e.value < 0) {
             // overflow
-            qt_cbor_stream_set_error(reader.d.data(), { QCborError::DataTooLarge });
+            setErrorInReader(reader, { QCborError::DataTooLarge });
             return;
         }
     }
@@ -1562,7 +1600,7 @@ void QCborContainerPrivate::decodeStringFromCbor(QCborStreamReader &reader)
             auto utf8result = QUtf8::isValidUtf8(dataPtr() + data.size() - len, len);
             if (!utf8result.isValidUtf8) {
                 r.status = QCborStreamReader::Error;
-                qt_cbor_stream_set_error(reader.d.data(), { QCborError::InvalidUtf8String });
+                setErrorInReader(reader, { QCborError::InvalidUtf8String });
                 break;
             }
             isAscii = isAscii && utf8result.isValidAscii;
@@ -1586,7 +1624,7 @@ void QCborContainerPrivate::decodeStringFromCbor(QCborStreamReader &reader)
 
         // error
         r.status = QCborStreamReader::Error;
-        qt_cbor_stream_set_error(reader.d.data(), { QCborError::DataTooLarge });
+        setErrorInReader(reader, { QCborError::DataTooLarge });
     }
 
     if (r.status == QCborStreamReader::Error) {
@@ -1612,9 +1650,10 @@ void QCborContainerPrivate::decodeStringFromCbor(QCborStreamReader &reader)
     elements.append(e);
 }
 
-void QCborContainerPrivate::decodeValueFromCbor(QCborStreamReader &reader)
+void QCborContainerPrivate::decodeValueFromCbor(QCborStreamReader &reader, int remainingRecursionDepth)
 {
-    switch (reader.type()) {
+    QCborStreamReader::Type t = reader.type();
+    switch (t) {
     case QCborStreamReader::UnsignedInteger:
     case QCborStreamReader::NegativeInteger:
     case QCborStreamReader::SimpleType:
@@ -1631,37 +1670,17 @@ void QCborContainerPrivate::decodeValueFromCbor(QCborStreamReader &reader)
 
     case QCborStreamReader::Array:
     case QCborStreamReader::Map:
+        return append(makeValue(t == QCborStreamReader::Array ? QCborValue::Array : QCborValue::Map, -1,
+                                createContainerFromCbor(reader, remainingRecursionDepth),
+                                MoveContainer));
+
     case QCborStreamReader::Tag:
-        return append(QCborValue::fromCbor(reader));
+        return append(taggedValueFromCbor(reader, remainingRecursionDepth));
 
     case QCborStreamReader::Invalid:
         return;                 // probably a decode error
     }
 }
-
-void QCborContainerPrivate::decodeFromCbor(QCborStreamReader &reader)
-{
-    int mapShift = reader.isMap() ? 1 : 0;
-    if (reader.isLengthKnown()) {
-        quint64 len = reader.length();
-
-        // Clamp allocation to 1M elements (avoids crashing due to corrupt
-        // stream or loss of precision when converting from quint64 to
-        // QVector::size_type).
-        len = qMin(len, quint64(1024 * 1024 - 1));
-        elements.reserve(qsizetype(len) << mapShift);
-    }
-
-    reader.enterContainer();
-    if (reader.lastError() != QCborError::NoError)
-        return;
-
-    while (reader.hasNext() && reader.lastError() == QCborError::NoError)
-        decodeValueFromCbor(reader);
-
-    if (reader.lastError() == QCborError::NoError)
-        reader.leaveContainer();
-}
 #endif // QT_CONFIG(cborstreamreader)
 
 /*!
@@ -2363,6 +2382,8 @@ QCborValueRef QCborValue::operator[](qint64 key)
 }
 
 #if QT_CONFIG(cborstreamreader)
+enum { MaximumRecursionDepth = 1024 };
+
 /*!
     Decodes one item from the CBOR stream found in \a reader and returns the
     equivalent representation. This function is recursive: if the item is a map
@@ -2423,12 +2444,12 @@ QCborValue QCborValue::fromCbor(QCborStreamReader &reader)
     case QCborStreamReader::Map:
         result.n = -1;
         result.t = reader.isArray() ? Array : Map;
-        result.container = createContainerFromCbor(reader);
+        result.container = createContainerFromCbor(reader, MaximumRecursionDepth);
         break;
 
     // tag
     case QCborStreamReader::Tag:
-        result = taggedValueFromCbor(reader);
+        result = taggedValueFromCbor(reader, MaximumRecursionDepth);
         break;
     }
 
diff --git a/src/corelib/serialization/qcborvalue_p.h b/src/corelib/serialization/qcborvalue_p.h
index a74ac2ba10..041a20e746 100644
--- a/src/corelib/serialization/qcborvalue_p.h
+++ b/src/corelib/serialization/qcborvalue_p.h
@@ -405,9 +405,9 @@ public:
         elements.remove(idx);
     }
 
-    void decodeValueFromCbor(QCborStreamReader &reader);
-    void decodeFromCbor(QCborStreamReader &reader);
+    void decodeValueFromCbor(QCborStreamReader &reader, int remainiingStackDepth);
     void decodeStringFromCbor(QCborStreamReader &reader);
+    static inline void setErrorInReader(QCborStreamReader &reader, QCborError error);
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.h b/src/plugins/platforms/cocoa/qcocoabackingstore.h
index b57deacb57..3d9dfd8359 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.h
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.h
@@ -47,6 +47,8 @@
 #include <QScopedPointer>
 #include "qiosurfacegraphicsbuffer.h"
 
+#include <unordered_map>
+
 QT_BEGIN_NAMESPACE
 
 class QCocoaBackingStore : public QRasterBackingStore
@@ -71,8 +73,9 @@ private:
     void redrawRoundedBottomCorners(CGRect) const;
 };
 
-class QCALayerBackingStore : public QCocoaBackingStore
+class QCALayerBackingStore : public QObject, public QCocoaBackingStore
 {
+    Q_OBJECT
 public:
     QCALayerBackingStore(QWindow *window);
     ~QCALayerBackingStore();
@@ -119,6 +122,11 @@ private:
     QMacNotificationObserver m_backingPropertiesObserver;
 
     std::list<std::unique_ptr<GraphicsBuffer>> m_buffers;
+
+    void flushSubWindow(QWindow *window);
+    std::unordered_map<QWindow*, std::unique_ptr<QCALayerBackingStore>> m_subWindowBackingstores;
+    void windowDestroyed(QObject *object);
+    bool m_clearSurfaceOnPaint = true;
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.mm b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
index cb019c3775..2b4c71f279 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.mm
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
@@ -382,7 +382,7 @@ void QCALayerBackingStore::beginPaint(const QRegion &region)
     // Although undocumented, QBackingStore::beginPaint expects the painted region
     // to be cleared before use if the window has a surface format with an alpha.
     // Fresh IOSurfaces are already cleared, so we don't need to clear those.
-    if (!bufferWasRecreated && window()->format().hasAlpha()) {
+    if (m_clearSurfaceOnPaint && !bufferWasRecreated && window()->format().hasAlpha()) {
         qCDebug(lcQpaBackingStore) << "Clearing" << region << "before use";
         QPainter painter(m_buffers.back()->asImage());
         painter.setCompositionMode(QPainter::CompositionMode_Source);
@@ -511,9 +511,13 @@ void QCALayerBackingStore::flush(QWindow *flushedWindow, const QRegion &region,
     if (!prepareForFlush())
         return;
 
+    if (flushedWindow != window()) {
+        flushSubWindow(flushedWindow);
+        return;
+    }
+
     QMacAutoReleasePool pool;
 
-    NSView *backingStoreView = static_cast<QCocoaWindow *>(window()->handle())->view();
     NSView *flushedView = static_cast<QCocoaWindow *>(flushedWindow->handle())->view();
 
     // If the backingstore is just flushed, without being painted to first, then we may
@@ -548,7 +552,7 @@ void QCALayerBackingStore::flush(QWindow *flushedWindow, const QRegion &region,
     // are committed as part of a display-cycle instead of on the next runloop pass. This
     // means CA won't try to throttle us if we flush too fast, and we'll coalesce our flush
     // with other pending view and layer updates.
-    backingStoreView.window.viewsNeedDisplay = YES;
+    flushedView.window.viewsNeedDisplay = YES;
 
     if (window()->format().swapBehavior() == QSurfaceFormat::SingleBuffer) {
         // The private API [CALayer reloadValueForKeyPath:@"contents"] would be preferable,
@@ -556,28 +560,10 @@ void QCALayerBackingStore::flush(QWindow *flushedWindow, const QRegion &region,
         flushedView.layer.contents = nil;
     }
 
-    if (flushedView == backingStoreView) {
-        qCInfo(lcQpaBackingStore) << "Flushing" << backBufferSurface
-            << "to" << flushedView.layer << "of" << flushedView;
-        flushedView.layer.contents = backBufferSurface;
-    } else {
-        auto subviewRect = [flushedView convertRect:flushedView.bounds toView:backingStoreView];
-        auto scale = flushedView.layer.contentsScale;
-        subviewRect = CGRectApplyAffineTransform(subviewRect, CGAffineTransformMakeScale(scale, scale));
-
-        // We make a copy of the image data up front, which means we don't
-        // need to mark the IOSurface as being in use. FIXME: Investigate
-        // if there's a cheaper way to get sub-image data to a layer.
-        m_buffers.back()->lock(QPlatformGraphicsBuffer::SWReadAccess);
-        QImage subImage = m_buffers.back()->asImage()->copy(QRectF::fromCGRect(subviewRect).toRect());
-        m_buffers.back()->unlock();
+    qCInfo(lcQpaBackingStore) << "Flushing" << backBufferSurface
+        << "to" << flushedView.layer << "of" << flushedView;
 
-        qCInfo(lcQpaBackingStore) << "Flushing" << subImage
-            << "to" << flushedView.layer << "of subview" << flushedView;
-        QCFType<CGImageRef> cgImage = CGImageCreateCopyWithColorSpace(
-            QCFType<CGImageRef>(subImage.toCGImage()), colorSpace());
-        flushedView.layer.contents = (__bridge id)static_cast<CGImageRef>(cgImage);
-    }
+    flushedView.layer.contents = backBufferSurface;
 
     // Since we may receive multiple flushes before a new frame is started, we do not
     // swap any buffers just yet. Instead we check in the next beginPaint if the layer's
@@ -589,6 +575,53 @@ void QCALayerBackingStore::flush(QWindow *flushedWindow, const QRegion &region,
     // the window server.
 }
 
+void QCALayerBackingStore::flushSubWindow(QWindow *subWindow)
+{
+    qCInfo(lcQpaBackingStore) << "Flushing sub-window" << subWindow
+        << "via its own backingstore";
+
+    auto &subWindowBackingStore = m_subWindowBackingstores[subWindow];
+    if (!subWindowBackingStore) {
+        subWindowBackingStore.reset(new QCALayerBackingStore(subWindow));
+        QObject::connect(subWindow, &QObject::destroyed, this, &QCALayerBackingStore::windowDestroyed);
+        subWindowBackingStore->m_clearSurfaceOnPaint = false;
+    }
+
+    auto subWindowSize = subWindow->size();
+    static const auto kNoStaticContents = QRegion();
+    subWindowBackingStore->resize(subWindowSize, kNoStaticContents);
+
+    auto subWindowLocalRect = QRect(QPoint(), subWindowSize);
+    subWindowBackingStore->beginPaint(subWindowLocalRect);
+
+    QPainter painter(subWindowBackingStore->m_buffers.back()->asImage());
+    painter.setCompositionMode(QPainter::CompositionMode_Source);
+
+    NSView *backingStoreView = static_cast<QCocoaWindow *>(window()->handle())->view();
+    NSView *flushedView = static_cast<QCocoaWindow *>(subWindow->handle())->view();
+    auto subviewRect = [flushedView convertRect:flushedView.bounds toView:backingStoreView];
+    auto scale = flushedView.layer.contentsScale;
+    subviewRect = CGRectApplyAffineTransform(subviewRect, CGAffineTransformMakeScale(scale, scale));
+
+    m_buffers.back()->lock(QPlatformGraphicsBuffer::SWReadAccess);
+    const QImage *backingStoreImage = m_buffers.back()->asImage();
+    painter.drawImage(subWindowLocalRect, *backingStoreImage, QRectF::fromCGRect(subviewRect));
+    m_buffers.back()->unlock();
+
+    painter.end();
+    subWindowBackingStore->endPaint();
+    subWindowBackingStore->flush(subWindow, subWindowLocalRect, QPoint());
+
+    qCInfo(lcQpaBackingStore) << "Done flushing sub-window" << subWindow;
+}
+
+void QCALayerBackingStore::windowDestroyed(QObject *object)
+{
+    auto *window = static_cast<QWindow*>(object);
+    qCInfo(lcQpaBackingStore) << "Removing backingstore for sub-window" << window;
+    m_subWindowBackingstores.erase(window);
+}
+
 #ifndef QT_NO_OPENGL
 void QCALayerBackingStore::composeAndFlush(QWindow *window, const QRegion &region, const QPoint &offset,
                                     QPlatformTextureList *textures, bool translucentBackground)
@@ -722,4 +755,6 @@ QImage *QCALayerBackingStore::GraphicsBuffer::asImage()
     return &m_image;
 }
 
+#include "moc_qcocoabackingstore.cpp"
+
 QT_END_NAMESPACE