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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
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