dom/canvas/WebGLContextLossHandler.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "WebGLContextLossHandler.h"
   7 #include "WebGLContext.h"
   8
   9 #include "base/message_loop.h"
  10
  11 namespace mozilla {
  12
  13 WebGLContextLossHandler::WebGLContextLossHandler(WebGLContext* const webgl)
  14     : mTimerIsScheduled(false) {
  15   const auto weak = WeakPtr<WebGLContext>(webgl);
  16   mRunnable = NS_NewRunnableFunction("WebGLContextLossHandler", [weak]() {
  17     const auto strong = RefPtr<WebGLContext>(weak);
  18     if (!strong) {
  19       return;
  20     }
  21     strong->CheckForContextLoss();
  22   });
  23 }
  24
  25 WebGLContextLossHandler::~WebGLContextLossHandler() = default;
  26
  27 ////////////////////
  28
  29 void WebGLContextLossHandler::RunTimer() {
  30   const uint32_t kDelayMS = 1000;
  31   MOZ_ASSERT(GetCurrentSerialEventTarget());
  32   // Only create a new task if one isn't already queued.
  33   if (mTimerIsScheduled.compareExchange(false, true)) {
  34     GetCurrentSerialEventTarget()->DelayedDispatch(do_AddRef(mRunnable),
  35                                                    kDelayMS);
  36   }
  37 }
  38
  39 void WebGLContextLossHandler::ClearTimer() { mTimerIsScheduled = false; }
  40
  41 }  // namespace mozilla