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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 RateLimiter_h
#define RateLimiter_h
#if USE(ACCELERATED_COMPOSITING)
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace WebKit {
class WebGraphicsContext3D;
}
namespace WebCore {
class RateLimiterClient {
public:
virtual void rateLimit() = 0;
};
// 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 RefCounted<RateLimiter> {
public:
static PassRefPtr<RateLimiter> create(WebKit::WebGraphicsContext3D*, RateLimiterClient*);
~RateLimiter();
void start();
// Context and client will not be accessed after stop().
void stop();
private:
RateLimiter(WebKit::WebGraphicsContext3D*, RateLimiterClient*);
class Task;
friend class Task;
void rateLimitContext();
WebKit::WebGraphicsContext3D* m_context;
bool m_active;
RateLimiterClient *m_client;
};
}
#endif // USE(ACCELERATED_COMPOSITING)
#endif
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