зеркало из https://github.com/mozilla/gecko-dev.git
104 строки
2.6 KiB
C++
104 строки
2.6 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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#include "WebGLContextLossHandler.h"
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#include "mozilla/DebugOnly.h"
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#include "nsINamed.h"
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#include "nsISupportsImpl.h"
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#include "nsITimer.h"
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#include "nsThreadUtils.h"
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#include "WebGLContext.h"
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namespace mozilla {
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class WatchdogTimerEvent final : public nsITimerCallback, public nsINamed {
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const WeakPtr<WebGLContextLossHandler> mHandler;
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public:
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NS_DECL_ISUPPORTS
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explicit WatchdogTimerEvent(WebGLContextLossHandler* handler)
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: mHandler(handler) {}
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NS_IMETHOD GetName(nsACString& aName) override {
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aName.AssignLiteral("WatchdogTimerEvent");
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return NS_OK;
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}
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private:
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virtual ~WatchdogTimerEvent() {}
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NS_IMETHOD Notify(nsITimer*) override {
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if (mHandler) {
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mHandler->TimerCallback();
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}
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return NS_OK;
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}
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};
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NS_IMPL_ISUPPORTS(WatchdogTimerEvent, nsITimerCallback, nsINamed)
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////////////////////////////////////////
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WebGLContextLossHandler::WebGLContextLossHandler(WebGLContext* webgl)
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: mWebGL(webgl),
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mTimer(NS_NewTimer()),
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mTimerPending(false),
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mShouldRunTimerAgain(false)
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#ifdef DEBUG
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,
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mEventTarget(GetCurrentThreadSerialEventTarget())
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#endif
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{
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MOZ_ASSERT(mEventTarget);
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}
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WebGLContextLossHandler::~WebGLContextLossHandler() {
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const DebugOnly<nsISerialEventTarget*> callingThread =
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GetCurrentThreadSerialEventTarget();
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MOZ_ASSERT(!callingThread || mEventTarget->IsOnCurrentThread());
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}
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////////////////////
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void WebGLContextLossHandler::RunTimer() {
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MOZ_ASSERT(mEventTarget->IsOnCurrentThread());
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// If the timer was already running, don't restart it here. Instead,
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// wait until the previous call is done, then fire it one more time.
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// This is also an optimization to prevent unnecessary
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// cross-communication between threads.
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if (mTimerPending) {
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mShouldRunTimerAgain = true;
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return;
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}
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const RefPtr<WatchdogTimerEvent> event = new WatchdogTimerEvent(this);
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const uint32_t kDelayMS = 1000;
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mTimer->InitWithCallback(event, kDelayMS, nsITimer::TYPE_ONE_SHOT);
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mTimerPending = true;
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}
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////////////////////
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void WebGLContextLossHandler::TimerCallback() {
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MOZ_ASSERT(mEventTarget->IsOnCurrentThread());
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mTimerPending = false;
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const bool runOnceMore = mShouldRunTimerAgain;
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mShouldRunTimerAgain = false;
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mWebGL->UpdateContextLossStatus();
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if (runOnceMore && !mTimerPending) {
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RunTimer();
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}
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}
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} // namespace mozilla
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