1 files changed, 83 insertions, 0 deletions
diff --git a/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/UpdateAtlas.h b/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/UpdateAtlas.h
new file mode 100644
index 000000000..63f76be95
--- /dev/null
+++ b/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/UpdateAtlas.h
@@ -0,0 +1,83 @@
+/*
+ Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
+ Copyright (C) 2012 Company 100, Inc.
+
+ 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 "AreaAllocator.h"
+#include <WebCore/CoordinatedSurface.h>
+#include <WebCore/IntSize.h>
+#include <wtf/RefPtr.h>
+
+#if USE(COORDINATED_GRAPHICS)
+
+namespace WebCore {
+class GraphicsContext;
+class IntPoint;
+}
+
+namespace WebKit {
+
+class UpdateAtlas {
+    WTF_MAKE_NONCOPYABLE(UpdateAtlas);
+public:
+    class Client {
+    public:
+        virtual void createUpdateAtlas(uint32_t /* id */, RefPtr<WebCore::CoordinatedSurface>&&) = 0;
+        virtual void removeUpdateAtlas(uint32_t /* id */) = 0;
+    };
+
+    UpdateAtlas(Client&, int dimension, WebCore::CoordinatedSurface::Flags);
+    ~UpdateAtlas();
+
+    inline WebCore::IntSize size() const { return m_surface->size(); }
+
+    // Returns false if there is no available buffer.
+    bool paintOnAvailableBuffer(const WebCore::IntSize&, uint32_t& atlasID, WebCore::IntPoint& offset, WebCore::CoordinatedSurface::Client&);
+    void didSwapBuffers();
+    bool supportsAlpha() const { return m_surface->supportsAlpha(); }
+
+    void addTimeInactive(double seconds)
+    {
+        ASSERT(!isInUse());
+        m_inactivityInSeconds += seconds;
+    }
+    bool isInactive() const
+    {
+        const double inactiveSecondsTolerance = 3;
+        return m_inactivityInSeconds > inactiveSecondsTolerance;
+    }
+    bool isInUse() const { return !!m_areaAllocator; }
+
+private:
+    void buildLayoutIfNeeded();
+
+private:
+    Client& m_client;
+    std::unique_ptr<GeneralAreaAllocator> m_areaAllocator;
+    RefPtr<WebCore::CoordinatedSurface> m_surface;
+    double m_inactivityInSeconds { 0 };
+    uint32_t m_ID { 0 };
+};
+
+} // namespace WebKit
+
+#endif // USE(COORDINATED_GRAPHICS)
+#endif // UpdateAtlas_h