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/*
* Copyright (C) 2009, 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CrossThreadCopier_h
#define CrossThreadCopier_h
#include "platform/PlatformExport.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "wtf/Assertions.h"
#include "wtf/Forward.h"
#include "wtf/Functional.h" // FunctionThreadAffinity
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/ThreadSafeRefCounted.h"
#include "wtf/TypeTraits.h"
#include "wtf/WeakPtr.h"
#include <memory>
class SkRefCnt;
namespace WTF {
template <typename T>
class PassedWrapper;
}
namespace blink {
class IntRect;
class IntSize;
class KURL;
class ResourceError;
class ResourceRequest;
class ResourceResponse;
struct CrossThreadResourceResponseData;
struct CrossThreadResourceRequestData;
template <typename T>
class CrossThreadPersistent;
template <typename T>
class CrossThreadWeakPersistent;
template <typename T>
struct CrossThreadCopierPassThrough {
STATIC_ONLY(CrossThreadCopierPassThrough);
typedef T Type;
static Type copy(const T& parameter) { return parameter; }
};
template <typename T, bool isArithmeticOrEnum>
struct CrossThreadCopierBase;
// Arithmetic values (integers or floats) and enums can be safely copied.
template <typename T>
struct CrossThreadCopierBase<T, true> : public CrossThreadCopierPassThrough<T> {
STATIC_ONLY(CrossThreadCopierBase);
};
template <typename T>
struct CrossThreadCopier
: public CrossThreadCopierBase<T,
std::is_arithmetic<T>::value ||
std::is_enum<T>::value> {
STATIC_ONLY(CrossThreadCopier);
};
// CrossThreadCopier specializations follow.
template <typename T>
struct CrossThreadCopier<PassRefPtr<T>> {
STATIC_ONLY(CrossThreadCopier);
typedef PassRefPtr<T> Type;
static_assert(WTF::IsSubclassOfTemplate<T, ThreadSafeRefCounted>::value,
"PassRefPtr<T> can be passed across threads only if T is "
"ThreadSafeRefCounted.");
static PassRefPtr<T> copy(PassRefPtr<T>&& pointer) {
return std::move(pointer);
}
};
template <typename T>
struct CrossThreadCopier<RefPtr<T>>
: public CrossThreadCopierPassThrough<RefPtr<T>> {
STATIC_ONLY(CrossThreadCopier);
static_assert(WTF::IsSubclassOfTemplate<T, ThreadSafeRefCounted>::value,
"RefPtr<T> can be passed across threads only if T is "
"ThreadSafeRefCounted.");
};
template <typename T>
struct CrossThreadCopier<sk_sp<T>>
: public CrossThreadCopierPassThrough<sk_sp<T>> {
STATIC_ONLY(CrossThreadCopier);
static_assert(std::is_base_of<SkRefCnt, T>::value,
"sk_sp<T> can be passed across threads only if T is SkRefCnt.");
};
// nullptr_t can be passed through without any changes.
template <>
struct CrossThreadCopier<std::nullptr_t>
: public CrossThreadCopierPassThrough<std::nullptr_t> {
STATIC_ONLY(CrossThreadCopier);
};
// To allow a type to be passed across threads using its copy constructor, add a
// forward declaration of the type and provide a specialization of
// CrossThreadCopier<T> in this file, like IntRect below.
template <>
struct CrossThreadCopier<IntRect>
: public CrossThreadCopierPassThrough<IntRect> {
STATIC_ONLY(CrossThreadCopier);
};
template <>
struct CrossThreadCopier<IntSize>
: public CrossThreadCopierPassThrough<IntSize> {
STATIC_ONLY(CrossThreadCopier);
};
template <typename T, typename Deleter>
struct CrossThreadCopier<std::unique_ptr<T, Deleter>> {
STATIC_ONLY(CrossThreadCopier);
using Type = std::unique_ptr<T, Deleter>;
static std::unique_ptr<T, Deleter> copy(std::unique_ptr<T, Deleter> pointer) {
return pointer; // This is in fact a move.
}
};
template <typename T>
struct CrossThreadCopier<CrossThreadPersistent<T>>
: public CrossThreadCopierPassThrough<CrossThreadPersistent<T>> {
STATIC_ONLY(CrossThreadCopier);
};
template <typename T>
struct CrossThreadCopier<CrossThreadWeakPersistent<T>>
: public CrossThreadCopierPassThrough<CrossThreadWeakPersistent<T>> {
STATIC_ONLY(CrossThreadCopier);
};
template <typename T>
struct CrossThreadCopier<WTF::UnretainedWrapper<T, WTF::CrossThreadAffinity>>
: public CrossThreadCopierPassThrough<
WTF::UnretainedWrapper<T, WTF::CrossThreadAffinity>> {
STATIC_ONLY(CrossThreadCopier);
};
template <typename T>
struct CrossThreadCopier<WeakPtr<T>>
: public CrossThreadCopierPassThrough<WeakPtr<T>> {
STATIC_ONLY(CrossThreadCopier);
};
template <typename T>
struct CrossThreadCopier<WTF::PassedWrapper<T>> {
STATIC_ONLY(CrossThreadCopier);
using Type = WTF::PassedWrapper<typename CrossThreadCopier<T>::Type>;
static Type copy(WTF::PassedWrapper<T>&& value) {
return WTF::passed(CrossThreadCopier<T>::copy(value.moveOut()));
}
};
template <>
struct CrossThreadCopier<KURL> {
STATIC_ONLY(CrossThreadCopier);
typedef KURL Type;
PLATFORM_EXPORT static Type copy(const KURL&);
};
template <>
struct CrossThreadCopier<String> {
STATIC_ONLY(CrossThreadCopier);
typedef String Type;
PLATFORM_EXPORT static Type copy(const String&);
};
template <>
struct CrossThreadCopier<ResourceError> {
STATIC_ONLY(CrossThreadCopier);
typedef ResourceError Type;
PLATFORM_EXPORT static Type copy(const ResourceError&);
};
template <>
struct CrossThreadCopier<ResourceRequest> {
STATIC_ONLY(CrossThreadCopier);
typedef WTF::PassedWrapper<std::unique_ptr<CrossThreadResourceRequestData>>
Type;
PLATFORM_EXPORT static Type copy(const ResourceRequest&);
};
template <>
struct CrossThreadCopier<ResourceResponse> {
STATIC_ONLY(CrossThreadCopier);
typedef WTF::PassedWrapper<std::unique_ptr<CrossThreadResourceResponseData>>
Type;
PLATFORM_EXPORT static Type copy(const ResourceResponse&);
};
} // namespace blink
#endif // CrossThreadCopier_h
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