1 files changed, 64 insertions, 0 deletions
diff --git a/Source/WebKit2/WebProcess/WebPage/UpdateAtlas.h b/Source/WebKit2/WebProcess/WebPage/UpdateAtlas.h
new file mode 100644
index 000000000..9d10962a3
--- /dev/null
+++ b/Source/WebKit2/WebProcess/WebPage/UpdateAtlas.h
@@ -0,0 +1,64 @@
+/*
+ Copyright (C) 2012 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 library 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 library; 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 UpdateAtlas_h
+#define UpdateAtlas_h
+
+#include "ShareableSurface.h"
+
+#if USE(UI_SIDE_COMPOSITING)
+namespace WebCore {
+class GraphicsContext;
+class IntRect;
+}
+
+namespace WebKit {
+
+class UpdateAtlas {
+public:
+    UpdateAtlas(int dimension, ShareableBitmap::Flags);
+
+    PassRefPtr<ShareableSurface> surface() { return m_surface; }
+    inline WebCore::IntSize size() const { return m_surface->size(); }
+
+    // Returns a null pointer of there is no available buffer.
+    PassOwnPtr<WebCore::GraphicsContext> beginPaintingOnAvailableBuffer(const WebCore::IntSize&, WebCore::IntPoint& offset);
+    void didSwapBuffers();
+    ShareableBitmap::Flags flags() const { return m_flags; }
+
+private:
+    void buildLayoutIfNeeded();
+    WebCore::IntPoint offsetForIndex(int) const;
+    int findAvailableIndex(const WebCore::IntSize&);
+
+private:
+    enum State {
+        Available,
+        Taken
+    };
+
+    Vector<State> m_bufferStates;
+    Vector<int> m_layout;
+    ShareableBitmap::Flags m_flags;
+    RefPtr<ShareableSurface> m_surface;
+};
+
+}
+#endif
+#endif // UpdateAtlas_h