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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFX_VSYNCSOURCE_H
#define GFX_VSYNCSOURCE_H
#include "nsTArray.h"
#include "mozilla/RefPtr.h"
#include "mozilla/Mutex.h"
#include "mozilla/TimeStamp.h"
#include "nsISupportsImpl.h"
namespace mozilla {
class RefreshTimerVsyncDispatcher;
class CompositorVsyncDispatcher;
namespace gfx {
// Controls how and when to enable/disable vsync. Lives as long as the
// gfxPlatform does on the parent process
class VsyncSource
{
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VsyncSource)
typedef mozilla::RefreshTimerVsyncDispatcher RefreshTimerVsyncDispatcher;
typedef mozilla::CompositorVsyncDispatcher CompositorVsyncDispatcher;
public:
// Controls vsync unique to each display and unique on each platform
class Display {
public:
Display();
virtual ~Display();
// Notified when this display's vsync occurs, on the vsync thread
// The aVsyncTimestamp should normalize to the Vsync time that just occured
// However, different platforms give different vsync notification times.
// b2g - The vsync timestamp of the previous frame that was just displayed
// OSX - The vsync timestamp of the upcoming frame, in the future
// Windows: It's messy, see gfxWindowsPlatform.
// Android: TODO
// All platforms should normalize to the vsync that just occured.
// Large parts of Gecko assume TimeStamps should not be in the future such as animations
virtual void NotifyVsync(TimeStamp aVsyncTimestamp);
RefPtr<RefreshTimerVsyncDispatcher> GetRefreshTimerVsyncDispatcher();
void AddCompositorVsyncDispatcher(CompositorVsyncDispatcher* aCompositorVsyncDispatcher);
void RemoveCompositorVsyncDispatcher(CompositorVsyncDispatcher* aCompositorVsyncDispatcher);
void NotifyRefreshTimerVsyncStatus(bool aEnable);
virtual TimeDuration GetVsyncRate();
// These should all only be called on the main thread
virtual void EnableVsync() = 0;
virtual void DisableVsync() = 0;
virtual bool IsVsyncEnabled() = 0;
virtual void Shutdown() = 0;
private:
void UpdateVsyncStatus();
Mutex mDispatcherLock;
bool mRefreshTimerNeedsVsync;
nsTArray<RefPtr<CompositorVsyncDispatcher>> mCompositorVsyncDispatchers;
RefPtr<RefreshTimerVsyncDispatcher> mRefreshTimerVsyncDispatcher;
};
void AddCompositorVsyncDispatcher(CompositorVsyncDispatcher* aCompositorVsyncDispatcher);
void RemoveCompositorVsyncDispatcher(CompositorVsyncDispatcher* aCompositorVsyncDispatcher);
RefPtr<RefreshTimerVsyncDispatcher> GetRefreshTimerVsyncDispatcher();
virtual Display& GetGlobalDisplay() = 0; // Works across all displays
void Shutdown();
protected:
virtual ~VsyncSource() {}
};
} // namespace gfx
} // namespace mozilla
#endif /* GFX_VSYNCSOURCE_H */
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