dom/base/AnimationFrameProvider.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/AnimationFrameProvider.h"
   8 #include "nsThreadUtils.h"
   9
  10 namespace mozilla::dom {
  11
  12 FrameRequest::FrameRequest(FrameRequestCallback& aCallback, int32_t aHandle)
  13     : mCallback(&aCallback), mHandle(aHandle) {
  14   LogFrameRequestCallback::LogDispatch(mCallback);
  15 }
  16
  17 FrameRequest::~FrameRequest() = default;
  18
  19 nsresult FrameRequestManager::Schedule(FrameRequestCallback& aCallback,
  20                                        int32_t* aHandle) {
  21   if (mCallbackCounter == INT32_MAX) {
  22     // Can't increment without overflowing; bail out
  23     return NS_ERROR_NOT_AVAILABLE;
  24   }
  25   int32_t newHandle = ++mCallbackCounter;
  26
  27   mCallbacks.AppendElement(FrameRequest(aCallback, newHandle));
  28
  29   *aHandle = newHandle;
  30   return NS_OK;
  31 }
  32
  33 bool FrameRequestManager::Cancel(int32_t aHandle) {
  34   // mCallbacks is stored sorted by handle
  35   if (mCallbacks.RemoveElementSorted(aHandle)) {
  36     return true;
  37   }
  38
  39   Unused << mCanceledCallbacks.put(aHandle);
  40   return false;
  41 }
  42
  43 void FrameRequestManager::Unlink() { mCallbacks.Clear(); }
  44
  45 void FrameRequestManager::Traverse(nsCycleCollectionTraversalCallback& aCB) {
  46   for (auto& i : mCallbacks) {
  47     NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCB,
  48                                        "FrameRequestManager::mCallbacks[i]");
  49     aCB.NoteXPCOMChild(i.mCallback);
  50   }
  51 }
  52
  53 }  // namespace mozilla::dom