1 files changed, 82 insertions, 0 deletions
diff --git a/Source/WebKit2/UIProcess/qt/QtSGUpdateQueue.h b/Source/WebKit2/UIProcess/qt/QtSGUpdateQueue.h
new file mode 100644
index 000000000..f70c50668
--- /dev/null
+++ b/Source/WebKit2/UIProcess/qt/QtSGUpdateQueue.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this program; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef QtSGUpdateQueue_h
+#define QtSGUpdateQueue_h
+
+#include "Deque.h"
+#include "HashMap.h"
+#include "OwnPtr.h"
+
+class QImage;
+class QRect;
+class QQuickItem;
+class QSGNode;
+class QSize;
+
+namespace WebKit {
+
+class NodeUpdate;
+class PageNode;
+class QtSGTileNode;
+
+// Takes care of taking update requests then fulfilling them asynchronously on the scene graph thread.
+class QtSGUpdateQueue {
+public:
+    QtSGUpdateQueue(QQuickItem*);
+
+    int createTileNode(float scale);
+    void removeTileNode(int nodeID);
+    void setNodeBackBuffer(int nodeID, const QImage& texture, const QRect& sourceRect, const QRect& targetRect);
+    void swapTileBuffers();
+
+    // Called by the QQuickItem.
+    void applyUpdates(QSGNode* itemNode);
+    bool isSwapPending() const { return m_isSwapPending; }
+
+private:
+    QSGNode* getScaleNode(float scale, QSGNode* itemNode);
+
+    QQuickItem* item;
+    Deque<OwnPtr<NodeUpdate> > nodeUpdateQueue;
+    HashMap<int, QtSGTileNode*> nodes;
+    float lastScale;
+    QSGNode* lastScaleNode;
+    int nextNodeID;
+    bool m_isSwapPending;
+};
+
+struct NodeUpdate {
+    enum Type {
+        CreateTile,
+        RemoveTile,
+        SetBackBuffer,
+        SwapTileBuffers
+    };
+    NodeUpdate(Type type)
+        : type(type)
+    { }
+    virtual ~NodeUpdate() { }
+    Type type;
+};
+
+}
+
+#endif // QtSGUpdateQueue_h