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#ifndef DELEGATED_FRAME_NODE_H
#define DELEGATED_FRAME_NODE_H

#include "base/memory/scoped_ptr.h"
#include "cc/quads/render_pass.h"
#include "cc/resources/transferable_resource.h"
#include "gpu/command_buffer/service/sync_point_manager.h"
#include "ui/gl/gl_fence.h"
#include <QMutex>
#include <QSGNode>
#include <QSharedData>
#include <QSharedPointer>
#include <QWaitCondition>

#include "chromium_gpu_helper.h"
#include "render_widget_host_view_qt_delegate.h"

QT_BEGIN_NAMESPACE
class QSGLayer;
QT_END_NAMESPACE

namespace cc {
class DelegatedFrameData;
}

namespace QtWebEngineCore {

class MailboxTexture;
class ResourceHolder;

// Separating this data allows another DelegatedFrameNode to reconstruct the QSGNode tree from the mailbox textures
// and render pass information.
class ChromiumCompositorData : public QSharedData {
public:
    ChromiumCompositorData() : frameDevicePixelRatio(1) { }
    QHash<unsigned, QSharedPointer<ResourceHolder> > resourceHolders;
    scoped_ptr<cc::DelegatedFrameData> frameData;
    qreal frameDevicePixelRatio;
};

class DelegatedFrameNode : public QSGTransformNode {
public:
    DelegatedFrameNode();
    ~DelegatedFrameNode();
    void preprocess();
    void commit(ChromiumCompositorData *chromiumCompositorData, cc::ReturnedResourceArray *resourcesToRelease, RenderWidgetHostViewQtDelegate *apiDelegate);

private:
    void fetchAndSyncMailboxes(QList<MailboxTexture *> &mailboxesToFetch);
    // Making those callbacks static bypasses base::Bind's ref-counting requirement
    // of the this pointer when the callback is a method.
    static void pullTexture(DelegatedFrameNode *frameNode, MailboxTexture *mailbox);
    static void fenceAndUnlockQt(DelegatedFrameNode *frameNode);

    ResourceHolder *findAndHoldResource(unsigned resourceId, QHash<unsigned, QSharedPointer<ResourceHolder> > &candidates);
    QSGTexture *initAndHoldTexture(ResourceHolder *resource, bool quadIsAllOpaque, RenderWidgetHostViewQtDelegate *apiDelegate = 0);

    QExplicitlySharedDataPointer<ChromiumCompositorData> m_chromiumCompositorData;
    struct SGObjects {
        QVector<QPair<cc::RenderPassId, QSharedPointer<QSGLayer> > > renderPassLayers;
        QVector<QSharedPointer<QSGRootNode> > renderPassRootNodes;
        QVector<QSharedPointer<QSGTexture> > textureStrongRefs;
    } m_sgObjects;
    int m_numPendingSyncPoints;
    QWaitCondition m_mailboxesFetchedWaitCond;
    QMutex m_mutex;
    QList<gfx::TransferableFence> m_textureFences;
    scoped_ptr<gpu::SyncPointClient> m_syncPointClient;
};

} // namespace QtWebEngineCore

#endif // DELEGATED_FRAME_NODE_H