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// Copyright 2011 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_SCHEDULER_RATE_LIMITER_H_
#define CC_SCHEDULER_RATE_LIMITER_H_
#include "base/memory/ref_counted.h"
namespace base { class SingleThreadTaskRunner; }
namespace WebKit { class WebGraphicsContext3D; }
namespace cc {
class RateLimiterClient {
public:
virtual void RateLimit() = 0;
protected:
virtual ~RateLimiterClient() {}
};
// A RateLimiter can be used to make sure that a single context does not
// dominate all execution time. To use, construct a RateLimiter class around
// the context and call Start() whenever calls are made on the context outside
// of normal flow control. RateLimiter will block if the context is too far
// ahead of the compositor.
class RateLimiter : public base::RefCounted<RateLimiter> {
public:
static scoped_refptr<RateLimiter> Create(
WebKit::WebGraphicsContext3D* context,
RateLimiterClient* client,
base::SingleThreadTaskRunner* task_runner);
void Start();
// Context and client will not be accessed after Stop().
void Stop();
private:
friend class base::RefCounted<RateLimiter>;
RateLimiter(WebKit::WebGraphicsContext3D* context,
RateLimiterClient* client,
base::SingleThreadTaskRunner* task_runner);
~RateLimiter();
void RateLimitContext();
WebKit::WebGraphicsContext3D* context_;
bool active_;
RateLimiterClient* client_;
base::SingleThreadTaskRunner* task_runner_;
DISALLOW_COPY_AND_ASSIGN(RateLimiter);
};
} // namespace cc
#endif // CC_SCHEDULER_RATE_LIMITER_H_
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