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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_TREES_LAYER_TREE_HOST_CLIENT_H_
#define CC_TREES_LAYER_TREE_HOST_CLIENT_H_
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "cc/debug/frame_timing_tracker.h"
namespace gfx {
class Vector2d;
class Vector2dF;
}
namespace cc {
class ContextProvider;
class InputHandlerClient;
class OutputSurface;
struct BeginFrameArgs;
class LayerTreeHostClient {
public:
virtual void WillBeginMainFrame() = 0;
// Marks finishing compositing-related tasks on the main thread. In threaded
// mode, this corresponds to DidCommit().
virtual void BeginMainFrame(const BeginFrameArgs& args) = 0;
virtual void BeginMainFrameNotExpectedSoon() = 0;
virtual void DidBeginMainFrame() = 0;
// A LayerTreeHost is bound to a LayerTreeHostClient. Visual frame-based
// updates to the state of the LayerTreeHost are expected to happen only in
// calls to LayerTreeHostClient::UpdateLayerTreeHost, which should
// mutate/invalidate the layer tree or other page parameters as appropriate.
//
// An example of a LayerTreeHostClient is (via additional indirections) Blink,
// which inside of LayerTreeHostClient::UpdateLayerTreeHost will update
// (Blink's notions of) style, layout, paint invalidation and compositing
// state. (The "compositing state" will result in a mutated layer tree on the
// LayerTreeHost via additional interface indirections which lead back to
// mutations on the LayerTreeHost.)
virtual void UpdateLayerTreeHost() = 0;
virtual void ApplyViewportDeltas(
const gfx::Vector2dF& inner_delta,
const gfx::Vector2dF& outer_delta,
const gfx::Vector2dF& elastic_overscroll_delta,
float page_scale,
float top_controls_delta) = 0;
// Request an OutputSurface from the client. When the client has one it should
// call LayerTreeHost::SetOutputSurface. This will result in either
// DidFailToInitializeOutputSurface or DidInitializeOutputSurface being
// called.
virtual void RequestNewOutputSurface() = 0;
virtual void DidInitializeOutputSurface() = 0;
virtual void DidFailToInitializeOutputSurface() = 0;
virtual void WillCommit() = 0;
virtual void DidCommit() = 0;
virtual void DidCommitAndDrawFrame() = 0;
virtual void DidCompleteSwapBuffers() = 0;
virtual void RecordFrameTimingEvents(
scoped_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
scoped_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events) = 0;
// Called when page scale animation has completed.
virtual void DidCompletePageScaleAnimation() = 0;
// TODO(simonhong): Makes this to pure virtual function when client
// implementation is ready.
virtual void SendBeginFramesToChildren(const BeginFrameArgs& args) {}
protected:
virtual ~LayerTreeHostClient() {}
};
} // namespace cc
#endif // CC_TREES_LAYER_TREE_HOST_CLIENT_H_
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