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+/* 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/. */
+
+// Utility functions to help with Apple API calls.
+
+#ifndef mozilla_AppleUtils_h
+#define mozilla_AppleUtils_h
+
+#include "mozilla/Attributes.h"
+#include <CoreFoundation/CFBase.h> // For CFRelease()
+#include <CoreVideo/CVBuffer.h> // For CVBufferRelease()
+
+namespace mozilla {
+
+// Wrapper class to call CFRelease/CVBufferRelease on reference types
+// when they go out of scope.
+template <class T, class F, F relFunc>
+class AutoObjRefRelease {
+ public:
+ MOZ_IMPLICIT AutoObjRefRelease(T aRef) : mRef(aRef) {}
+ ~AutoObjRefRelease() {
+ if (mRef) {
+ relFunc(mRef);
+ }
+ }
+ // Return the wrapped ref so it can be used as an in parameter.
+ operator T() { return mRef; }
+ // Return a pointer to the wrapped ref for use as an out parameter.
+ T* receive() { return &mRef; }
+
+ private:
+ // Copy operator isn't supported and is not implemented.
+ AutoObjRefRelease<T, F, relFunc>& operator=(
+ const AutoObjRefRelease<T, F, relFunc>&);
+ T mRef;
+};
+
+template <typename T>
+using AutoCFRelease = AutoObjRefRelease<T, decltype(&CFRelease), &CFRelease>;
+template <typename T>
+using AutoCVBufferRelease =
+ AutoObjRefRelease<T, decltype(&CVBufferRelease), &CVBufferRelease>;
+
+// CFRefPtr: A CoreFoundation smart pointer.
+template <class T>
+class CFRefPtr {
+ public:
+ explicit CFRefPtr(T aRef) : mRef(aRef) {
+ if (mRef) {
+ CFRetain(mRef);
+ }
+ }
+ // Copy constructor.
+ CFRefPtr(const CFRefPtr<T>& aCFRefPtr) : mRef(aCFRefPtr.mRef) {
+ if (mRef) {
+ CFRetain(mRef);
+ }
+ }
+ // Copy operator
+ CFRefPtr<T>& operator=(const CFRefPtr<T>& aCFRefPtr) {
+ if (mRef == aCFRefPtr.mRef) {
+ return;
+ }
+ if (mRef) {
+ CFRelease(mRef);
+ }
+ mRef = aCFRefPtr.mRef;
+ if (mRef) {
+ CFRetain(mRef);
+ }
+ return *this;
+ }
+ ~CFRefPtr() {
+ if (mRef) {
+ CFRelease(mRef);
+ }
+ }
+ // Return the wrapped ref so it can be used as an in parameter.
+ operator T() { return mRef; }
+
+ private:
+ T mRef;
+};
+
+} // namespace mozilla
+
+#endif // mozilla_AppleUtils_h