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108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _WaylandVsyncSource_h_
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#define _WaylandVsyncSource_h_
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#include "mozilla/RefPtr.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/Monitor.h"
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#include "MozContainer.h"
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#include "VsyncSource.h"
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#include "base/thread.h"
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#include "nsWaylandDisplay.h"
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namespace mozilla {
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/*
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* WaylandVsyncSource
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*
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* This class provides a per-widget VsyncSource under Wayland, emulated using
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* frame callbacks on the widget surface with empty surface commits.
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*
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* Wayland does not expose vsync/vblank, as it considers that an implementation
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* detail the clients should not concern themselves with. Instead, frame
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* callbacks are provided whenever the compositor believes it is a good time to
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* start drawing the next frame for a particular surface, giving us as much
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* time as possible to do so.
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*
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* Note that the compositor sends frame callbacks only when it sees fit, and
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* when that may be is entirely up to the compositor. One cannot expect a
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* certain rate of callbacks, or any callbacks at all. Examples of common
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* variations would be surfaces moved between outputs with different refresh
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* rates, and surfaces that are hidden and therefore do not receieve any
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* callbacks at all. Other hypothetical scenarios of variation could be
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* throttling to conserve power, or because a user has requested it.
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*
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*/
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class WaylandVsyncSource final : public gfx::VsyncSource {
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public:
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explicit WaylandVsyncSource(MozContainer* container) {
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MOZ_ASSERT(NS_IsMainThread());
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mGlobalDisplay = new WaylandDisplay(container);
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}
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virtual ~WaylandVsyncSource() { MOZ_ASSERT(NS_IsMainThread()); }
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virtual Display& GetGlobalDisplay() override { return *mGlobalDisplay; }
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struct WaylandFrameCallbackContext;
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class WaylandDisplay final : public mozilla::gfx::VsyncSource::Display {
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public:
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explicit WaylandDisplay(MozContainer* container);
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bool Setup();
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void EnableMonitor();
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void DisableMonitor();
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void FrameCallback();
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void Notify();
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virtual void EnableVsync() override;
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virtual void DisableVsync() override;
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virtual bool IsVsyncEnabled() override;
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virtual void Shutdown() override;
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private:
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virtual ~WaylandDisplay() = default;
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void Loop();
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void SetupFrameCallback();
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void ClearFrameCallback();
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base::Thread mThread;
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RefPtr<Runnable> mTask;
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WaylandFrameCallbackContext* mCallbackContext;
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Monitor mNotifyThreadMonitor;
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Mutex mEnabledLock;
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bool mVsyncEnabled;
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bool mMonitorEnabled;
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bool mShutdown;
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struct wl_display* mDisplay;
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MozContainer* mContainer;
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};
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// The WaylandFrameCallbackContext is a context owned by the frame callbacks.
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// It is created by the display, but deleted by the frame callbacks on the
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// next callback after being disabled.
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struct WaylandFrameCallbackContext {
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explicit WaylandFrameCallbackContext(
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WaylandVsyncSource::WaylandDisplay* aDisplay)
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: mEnabled(true), mDisplay(aDisplay) {}
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bool mEnabled;
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WaylandVsyncSource::WaylandDisplay* mDisplay;
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};
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private:
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// We need a refcounted VsyncSource::Display to use chromium IPC runnables.
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RefPtr<WaylandDisplay> mGlobalDisplay;
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};
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} // namespace mozilla
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#endif // _WaylandVsyncSource_h_
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