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-rw-r--r--dom/base/AnimationFrameProvider.h78
1 files changed, 78 insertions, 0 deletions
diff --git a/dom/base/AnimationFrameProvider.h b/dom/base/AnimationFrameProvider.h
new file mode 100644
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+++ b/dom/base/AnimationFrameProvider.h
@@ -0,0 +1,78 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 mozilla_dom_AnimationFrameProvider_h
+#define mozilla_dom_AnimationFrameProvider_h
+
+#include "mozilla/dom/AnimationFrameProviderBinding.h"
+#include "mozilla/HashTable.h"
+#include "mozilla/RefPtr.h"
+#include "nsTArray.h"
+
+namespace mozilla::dom {
+
+struct FrameRequest {
+ FrameRequest(FrameRequestCallback& aCallback, int32_t aHandle);
+ ~FrameRequest();
+
+ // Comparator operators to allow RemoveElementSorted with an
+ // integer argument on arrays of FrameRequest
+ bool operator==(int32_t aHandle) const { return mHandle == aHandle; }
+ bool operator<(int32_t aHandle) const { return mHandle < aHandle; }
+
+ RefPtr<FrameRequestCallback> mCallback;
+ int32_t mHandle;
+};
+
+class FrameRequestManager {
+ public:
+ FrameRequestManager() = default;
+ ~FrameRequestManager() = default;
+
+ nsresult Schedule(FrameRequestCallback& aCallback, int32_t* aHandle);
+ bool Cancel(int32_t aHandle);
+
+ bool IsEmpty() const { return mCallbacks.IsEmpty(); }
+
+ bool IsCanceled(int32_t aHandle) const {
+ return !mCanceledCallbacks.empty() && mCanceledCallbacks.has(aHandle);
+ }
+
+ void Take(nsTArray<FrameRequest>& aCallbacks) {
+ aCallbacks = std::move(mCallbacks);
+ mCanceledCallbacks.clear();
+ }
+
+ void Unlink();
+
+ void Traverse(nsCycleCollectionTraversalCallback& aCB);
+
+ private:
+ nsTArray<FrameRequest> mCallbacks;
+
+ // The set of frame request callbacks that were canceled but which we failed
+ // to find in mFrameRequestCallbacks.
+ HashSet<int32_t> mCanceledCallbacks;
+
+ /**
+ * The current frame request callback handle
+ */
+ int32_t mCallbackCounter = 0;
+};
+
+inline void ImplCycleCollectionUnlink(FrameRequestManager& aField) {
+ aField.Unlink();
+}
+
+inline void ImplCycleCollectionTraverse(
+ nsCycleCollectionTraversalCallback& aCallback, FrameRequestManager& aField,
+ const char* aName, uint32_t aFlags) {
+ aField.Traverse(aCallback);
+}
+
+} // namespace mozilla::dom
+
+#endif