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// Copyright 2014 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 COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
#define COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
#include "base/message_loop/message_loop.h"
#include "components/scheduler/child/child_scheduler.h"
#include "components/scheduler/child/single_thread_idle_task_runner.h"
#include "components/scheduler/scheduler_export.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
namespace cc {
struct BeginFrameArgs;
}
namespace scheduler {
class SCHEDULER_EXPORT RendererScheduler : public ChildScheduler {
public:
~RendererScheduler() override;
static scoped_ptr<RendererScheduler> Create();
// Returns the compositor task runner.
virtual scoped_refptr<base::SingleThreadTaskRunner>
CompositorTaskRunner() = 0;
// Returns the loading task runner. This queue is intended for tasks related
// to resource dispatch, foreground HTML parsing, etc...
virtual scoped_refptr<base::SingleThreadTaskRunner> LoadingTaskRunner() = 0;
// Returns the timer task runner. This queue is intended for DOM Timers.
virtual scoped_refptr<base::SingleThreadTaskRunner> TimerTaskRunner() = 0;
// Called to notify about the start of an extended period where no frames
// need to be drawn. Must be called from the main thread.
virtual void BeginFrameNotExpectedSoon() = 0;
// Called to notify about the start of a new frame. Must be called from the
// main thread.
virtual void WillBeginFrame(const cc::BeginFrameArgs& args) = 0;
// Called to notify that a previously begun frame was committed. Must be
// called from the main thread.
virtual void DidCommitFrameToCompositor() = 0;
// Tells the scheduler that the system received an input event. Called by the
// compositor (impl) thread.
virtual void DidReceiveInputEventOnCompositorThread(
const blink::WebInputEvent& web_input_event) = 0;
// Tells the scheduler that the system is displaying an input animation (e.g.
// a fling). Called by the compositor (impl) thread.
virtual void DidAnimateForInputOnCompositorThread() = 0;
// Tells the scheduler that all render widgets managed by this renderer
// process have been hidden. The renderer is assumed to be visible when the
// scheduler is constructed. Must be called on the main thread.
virtual void OnRendererHidden() = 0;
// Tells the scheduler that at least one render widget managed by this
// renderer process has become visible and the renderer is no longer hidden.
// The renderer is assumed to be visible when the scheduler is constructed.
// Must be called on the main thread.
virtual void OnRendererVisible() = 0;
// Returns true if the scheduler has reason to believe that high priority work
// may soon arrive on the main thread, e.g., if gesture events were observed
// recently.
// Must be called from the main thread.
virtual bool IsHighPriorityWorkAnticipated() = 0;
// Suspends the timer queue and increments the timer queue suspension count.
// May only be called from the main thread.
virtual void SuspendTimerQueue() = 0;
// Decrements the timer queue suspension count and re-enables the timer queue
// if the suspension count is zero and the current schduler policy allows it.
virtual void ResumeTimerQueue() = 0;
protected:
RendererScheduler();
DISALLOW_COPY_AND_ASSIGN(RendererScheduler);
};
} // namespace scheduler
#endif // COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
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