/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef WebLayerTreeViewClient_h
#define WebLayerTreeViewClient_h

namespace WebKit {
class WebGraphicsContext3D;
struct WebSize;
class WebThread;

class WebLayerTreeViewClient {
public:
    // Updates animation and layout. This is called before the compositing pass
    // so that layers can be updated at the given frame time.
    virtual void animateAndLayout(double frameBeginTime) = 0;

    // Applies a scroll delta to the root layer, which is bundled with a page
    // scale factor that may apply a CSS transform on the whole document (used
    // for mobile-device pinch zooming). This is triggered by events sent to the
    // compositor thread through the WebCompositor interface.
    virtual void applyScrollAndScale(const WebSize& scrollDelta, float scaleFactor) = 0;

    // Creates a 3D context suitable for the compositing. This may be called
    // more than once if the context gets lost.
    virtual WebGraphicsContext3D* createContext3D() = 0;

    // Signals a successful rebinding of the 3D context (e.g. after a lost
    // context event).
    virtual void didRebindGraphicsContext(bool success) = 0;

    // Schedules a compositing pass, meaning the client should call
    // WebLayerTreeView::composite at a later time. This is only called if the
    // compositor thread is disabled; when enabled, the compositor will
    // internally schedule a compositing pass when needed.
    virtual void scheduleComposite() = 0;

protected:
    virtual ~WebLayerTreeViewClient() { }
};

} // namespace WebKit

#endif // WebLayerTreeViewClient_h