Merge remote-tracking branch 'origin/5.12' into 5.13

Change-Id: I5d587b79b96d2b44f1975419a658c259c63fa30d

src/plugins/platforms/wayland/qwaylanddatadevice.cpp

@@ -102,19 +102,22 @@ QWaylandDataOffer *QWaylandDataDevice::dragOffer() const
     return m_dragOffer.data();
 }
 
-void QWaylandDataDevice::startDrag(QMimeData *mimeData, QWaylandWindow *icon)
+bool QWaylandDataDevice::startDrag(QMimeData *mimeData, QWaylandWindow *icon)
 {
-    m_dragSource.reset(new QWaylandDataSource(m_display->dndSelectionHandler(), mimeData));
-    connect(m_dragSource.data(), &QWaylandDataSource::cancelled, this, &QWaylandDataDevice::dragSourceCancelled);
-
     QWaylandWindow *origin = m_display->currentInputDevice()->pointerFocus();
     if (!origin)
         origin = m_display->currentInputDevice()->touchFocus();
 
-    if (origin)
-        start_drag(m_dragSource->object(), origin->object(), icon->object(), m_display->currentInputDevice()->serial());
-    else
+    if (!origin) {
         qCDebug(lcQpaWayland) << "Couldn't start a drag because the origin window could not be found.";
+        return false;
+    }
+
+    m_dragSource.reset(new QWaylandDataSource(m_display->dndSelectionHandler(), mimeData));
+    connect(m_dragSource.data(), &QWaylandDataSource::cancelled, this, &QWaylandDataDevice::dragSourceCancelled);
+
+    start_drag(m_dragSource->object(), origin->object(), icon->object(), m_display->currentInputDevice()->serial());
+    return true;
 }
 
 void QWaylandDataDevice::cancelDrag()

src/plugins/platforms/wayland/qwaylanddatadevice_p.h

@@ -89,7 +89,7 @@ public:
 
 #if QT_CONFIG(draganddrop)
     QWaylandDataOffer *dragOffer() const;
-    void startDrag(QMimeData *mimeData, QWaylandWindow *icon);
+    bool startDrag(QMimeData *mimeData, QWaylandWindow *icon);
     void cancelDrag();
 #endif
 

src/plugins/platforms/wayland/qwaylanddnd.cpp

@@ -66,8 +66,13 @@ void QWaylandDrag::startDrag()
 {
     QBasicDrag::startDrag();
     QWaylandWindow *icon = static_cast<QWaylandWindow *>(shapedPixmapWindow()->handle());
-    m_display->currentInputDevice()->dataDevice()->startDrag(drag()->mimeData(), icon);
-    icon->addAttachOffset(-drag()->hotSpot());
+    if (m_display->currentInputDevice()->dataDevice()->startDrag(drag()->mimeData(), icon)) {
+        icon->addAttachOffset(-drag()->hotSpot());
+    } else {
+        // Cancelling immediately does not work, since the event loop for QDrag::exec is started
+        // after this function returns.
+        QMetaObject::invokeMethod(this, [this](){ cancelDrag(); }, Qt::QueuedConnection);
+    }
 }
 
 void QWaylandDrag::cancel()

src/plugins/platforms/wayland/qwaylandinputdevice.cpp

@@ -994,15 +994,20 @@ void QWaylandInputDevice::Touch::touch_up(uint32_t serial, uint32_t time, int32_
 {
     Q_UNUSED(serial);
     Q_UNUSED(time);
-    mFocus = nullptr;
     mParent->handleTouchPoint(id, 0, 0, Qt::TouchPointReleased);
 
-    // As of Weston 1.5.90 there is no touch_frame after the last touch_up
-    // (i.e. when the last finger is released). To accommodate for this, issue a
-    // touch_frame. This cannot hurt since it is safe to call the touch_frame
-    // handler multiple times when there are no points left.
-    if (allTouchPointsReleased())
+    if (allTouchPointsReleased()) {
+        mFocus = nullptr;
+
+        // As of Weston 7.0.0 there is no touch_frame after the last touch_up
+        // (i.e. when the last finger is released). To accommodate for this, issue a
+        // touch_frame. This cannot hurt since it is safe to call the touch_frame
+        // handler multiple times when there are no points left.
+        // See: https://gitlab.freedesktop.org/wayland/weston/issues/44
+        // TODO: change logging category to lcQpaWaylandInput in newer versions.
+        qCDebug(lcQpaWayland, "Generating fake frame event to work around Weston bug");
         touch_frame();
+    }
 }
 
 void QWaylandInputDevice::Touch::touch_motion(uint32_t time, int32_t id, wl_fixed_t x, wl_fixed_t y)
@@ -1013,8 +1018,7 @@ void QWaylandInputDevice::Touch::touch_motion(uint32_t time, int32_t id, wl_fixe
 
 void QWaylandInputDevice::Touch::touch_cancel()
 {
-    mPrevTouchPoints.clear();
-    mTouchPoints.clear();
+    mPendingTouchPoints.clear();
 
     QWaylandTouchExtension *touchExt = mParent->mQDisplay->touchExtension();
     if (touchExt)
@@ -1025,19 +1029,16 @@ void QWaylandInputDevice::Touch::touch_cancel()
 
 void QWaylandInputDevice::handleTouchPoint(int id, double x, double y, Qt::TouchPointState state)
 {
-    QWindowSystemInterface::TouchPoint tp;
+    auto end = mTouch->mPendingTouchPoints.end();
+    auto it = std::find_if(mTouch->mPendingTouchPoints.begin(), end, [id](auto tp){ return tp.id == id; });
+    if (it == end) {
+        it = mTouch->mPendingTouchPoints.insert(end, QWindowSystemInterface::TouchPoint());
+        it->id = id;
+    }
+    QWindowSystemInterface::TouchPoint &tp = *it;
 
-    // Find out the coordinates for Released events.
-    bool coordsOk = false;
-    if (state == Qt::TouchPointReleased)
-        for (int i = 0; i < mTouch->mPrevTouchPoints.count(); ++i)
-            if (mTouch->mPrevTouchPoints.at(i).id == id) {
-                tp.area = mTouch->mPrevTouchPoints.at(i).area;
-                coordsOk = true;
-                break;
-            }
-
-    if (!coordsOk) {
+    // Only moved and pressed needs to update/set position
+    if (state == Qt::TouchPointMoved || state == Qt::TouchPointPressed) {
         // x and y are surface relative.
         // We need a global (screen) position.
         QWaylandWindow *win = mTouch->mFocus;
@@ -1056,59 +1057,37 @@ void QWaylandInputDevice::handleTouchPoint(int id, double x, double y, Qt::Touch
     }
 
     tp.state = state;
-    tp.id = id;
     tp.pressure = tp.state == Qt::TouchPointReleased ? 0 : 1;
-    mTouch->mTouchPoints.append(tp);
 }
 
 bool QWaylandInputDevice::Touch::allTouchPointsReleased()
 {
-    for (int i = 0; i < mTouchPoints.count(); ++i)
-        if (mTouchPoints.at(i).state != Qt::TouchPointReleased)
+    for (const auto &tp : qAsConst(mPendingTouchPoints)) {
+        if (tp.state != Qt::TouchPointReleased)
             return false;
-
+    }
     return true;
 }
 
 void QWaylandInputDevice::Touch::releasePoints()
 {
-    Q_FOREACH (const QWindowSystemInterface::TouchPoint &previousPoint, mPrevTouchPoints) {
-        QWindowSystemInterface::TouchPoint tp = previousPoint;
+    if (mPendingTouchPoints.empty())
+        return;
+
+    for (QWindowSystemInterface::TouchPoint &tp : mPendingTouchPoints)
         tp.state = Qt::TouchPointReleased;
-        mTouchPoints.append(tp);
-    }
+
     touch_frame();
 }
 
 void QWaylandInputDevice::Touch::touch_frame()
 {
-    // Copy all points, that are in the previous but not in the current list, as stationary.
-    for (int i = 0; i < mPrevTouchPoints.count(); ++i) {
-        const QWindowSystemInterface::TouchPoint &prevPoint(mPrevTouchPoints.at(i));
-        if (prevPoint.state == Qt::TouchPointReleased)
-            continue;
-        bool found = false;
-        for (int j = 0; j < mTouchPoints.count(); ++j)
-            if (mTouchPoints.at(j).id == prevPoint.id) {
-                found = true;
-                break;
-            }
-        if (!found) {
-            QWindowSystemInterface::TouchPoint p = prevPoint;
-            p.state = Qt::TouchPointStationary;
-            mTouchPoints.append(p);
-        }
-    }
-
-    if (mTouchPoints.isEmpty()) {
-        mPrevTouchPoints.clear();
-        return;
-    }
+    // TODO: early return if no events?
 
     QWindow *window = mFocus ? mFocus->window() : nullptr;
 
     if (mFocus) {
-        const QWindowSystemInterface::TouchPoint &tp = mTouchPoints.last();
+        const QWindowSystemInterface::TouchPoint &tp = mPendingTouchPoints.last();
         // When the touch event is received, the global pos is calculated with the margins
         // in mind. Now we need to adjust again to get the correct local pos back.
         QMargins margins = window->frameMargins();
@@ -1117,14 +1096,21 @@ void QWaylandInputDevice::Touch::touch_frame()
         if (mFocus->touchDragDecoration(mParent, localPos, tp.area.center(), tp.state, mParent->modifiers()))
             return;
     }
-    QWindowSystemInterface::handleTouchEvent(window, mParent->mTouchDevice, mTouchPoints);
 
-    if (allTouchPointsReleased())
-        mPrevTouchPoints.clear();
-    else
-        mPrevTouchPoints = mTouchPoints;
+    QWindowSystemInterface::handleTouchEvent(window, mParent->mTouchDevice, mPendingTouchPoints);
+
+    // Prepare state for next frame
+    const auto prevTouchPoints = mPendingTouchPoints;
+    mPendingTouchPoints.clear();
+    for (const auto &prevPoint: prevTouchPoints) {
+        // All non-released touch points should be part of the next touch event
+        if (prevPoint.state != Qt::TouchPointReleased) {
+            QWindowSystemInterface::TouchPoint tp = prevPoint;
+            tp.state = Qt::TouchPointStationary; // ... as stationary (unless proven otherwise)
+            mPendingTouchPoints.append(tp);
+        }
+    }
 
-    mTouchPoints.clear();
 }
 
 }

src/plugins/platforms/wayland/qwaylandinputdevice_p.h

@@ -333,8 +333,7 @@ public:
 
     QWaylandInputDevice *mParent = nullptr;
     QPointer<QWaylandWindow> mFocus;
-    QList<QWindowSystemInterface::TouchPoint> mTouchPoints;
-    QList<QWindowSystemInterface::TouchPoint> mPrevTouchPoints;
+    QList<QWindowSystemInterface::TouchPoint> mPendingTouchPoints;
 };
 
 class QWaylandPointerEvent

src/plugins/platforms/wayland/qwaylandwindow.cpp

@@ -200,7 +200,10 @@ void QWaylandWindow::initWindow()
 void QWaylandWindow::initializeWlSurface()
 {
     Q_ASSERT(!isInitialized());
-    init(mDisplay->createSurface(static_cast<QtWayland::wl_surface *>(this)));
+    {
+        QWriteLocker lock(&mSurfaceLock);
+        init(mDisplay->createSurface(static_cast<QtWayland::wl_surface *>(this)));
+    }
     emit wlSurfaceCreated();
 }
 
@@ -238,6 +241,7 @@ void QWaylandWindow::reset(bool sendDestroyEvent)
     mSubSurfaceWindow = nullptr;
     if (isInitialized()) {
         emit wlSurfaceDestroyed();
+        QWriteLocker lock(&mSurfaceLock);
         destroy();
     }
     mScreens.clear();
@@ -659,10 +663,11 @@ QMutex QWaylandWindow::mFrameSyncMutex;
 
 bool QWaylandWindow::waitForFrameSync(int timeout)
 {
-    QMutexLocker locker(&mFrameSyncMutex);
     if (!mWaitingForFrameCallback)
         return true;
 
+    QMutexLocker locker(&mFrameSyncMutex);
+
     wl_proxy_set_queue(reinterpret_cast<wl_proxy *>(mFrameCallback), mFrameQueue);
     mDisplay->dispatchQueueWhile(mFrameQueue, [&]() { return mWaitingForFrameCallback; }, timeout);
 
@@ -1159,6 +1164,9 @@ void QWaylandWindow::requestUpdate()
 void QWaylandWindow::handleUpdate()
 {
     // TODO: Should sync subsurfaces avoid requesting frame callbacks?
+    QReadLocker lock(&mSurfaceLock);
+    if (!isInitialized())
+        return;
 
     if (mFrameCallback) {
         wl_callback_destroy(mFrameCallback);

src/plugins/platforms/wayland/qwaylandwindow_p.h

@@ -53,6 +53,8 @@
 
 #include <QtCore/QWaitCondition>
 #include <QtCore/QMutex>
+#include <QtCore/QReadWriteLock>
+
 #include <QtGui/QIcon>
 #include <QtCore/QVariant>
 #include <QtCore/QLoggingCategory>
@@ -279,6 +281,8 @@ private:
     static QMutex mFrameSyncMutex;
     static QWaylandWindow *mMouseGrab;
 
+    QReadWriteLock mSurfaceLock;
+
     friend class QWaylandSubSurface;
 };