134 lines
3.7 KiB
C++
134 lines
3.7 KiB
C++
/*
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* Copyright (C) 2013 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef GDIObject_h
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#define GDIObject_h
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#include <algorithm>
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#include <cstddef>
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#include <memory>
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#include <windows.h>
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#include <wtf/Assertions.h>
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#include <wtf/FastMalloc.h>
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#include <wtf/Noncopyable.h>
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namespace WTF {
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template<typename T> void deleteObject(T);
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template<typename T> class GDIObject {
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WTF_MAKE_NONCOPYABLE(GDIObject);
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WTF_MAKE_FAST_ALLOCATED;
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public:
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GDIObject() : m_object(0) { }
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GDIObject(std::nullptr_t) : m_object(0) { }
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~GDIObject() { deleteObject<T>(m_object); }
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T get() const { return m_object; }
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void clear();
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T leak() WARN_UNUSED_RETURN;
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bool operator!() const { return !m_object; }
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// This conversion operator allows implicit conversion to bool but not to other integer types.
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typedef const void* UnspecifiedBoolType;
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operator UnspecifiedBoolType() const { return m_object ? reinterpret_cast<UnspecifiedBoolType>(&m_object) : 0; }
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GDIObject<T>& operator=(std::nullptr_t) { clear(); return *this; }
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GDIObject(GDIObject&&);
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template<typename U> GDIObject(GDIObject<U>&&);
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GDIObject& operator=(GDIObject&&);
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template<typename U> GDIObject& operator=(GDIObject<U>&&);
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void swap(GDIObject& o) { std::swap(m_object, o.m_object); }
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private:
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template<typename U> friend GDIObject<U> adoptGDIObject(U);
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GDIObject(T object) : m_object(object) { }
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GDIObject<T>& operator=(T);
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T m_object;
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};
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template<typename T> inline void GDIObject<T>::clear()
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{
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T object = m_object;
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m_object = 0;
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deleteObject(object);
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}
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template<typename T> inline T GDIObject<T>::leak()
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{
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T object = m_object;
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m_object = 0;
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return object;
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}
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template<typename T> inline GDIObject<T>::GDIObject(GDIObject<T>&& other)
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: m_object(other.leak())
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{
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}
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template<typename T> inline GDIObject<T>& GDIObject<T>::operator=(GDIObject<T>&& other)
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{
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auto object = WTFMove(other);
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swap(object);
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return *this;
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}
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template<typename T> inline GDIObject<T> adoptGDIObject(T object)
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{
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return GDIObject<T>(object);
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}
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template<typename T> inline void swap(GDIObject<T>& a, GDIObject<T>& b)
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{
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a.swap(b);
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}
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// Nearly all GDI types use the same DeleteObject call.
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template<typename T> inline void deleteObject(T object)
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{
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if (object)
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::DeleteObject(object);
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}
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template<> inline void deleteObject<HDC>(HDC hdc)
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{
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if (hdc)
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::DeleteDC(hdc);
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}
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} // namespace WTF
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using WTF::GDIObject;
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using WTF::adoptGDIObject;
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#endif // GDIObject_h
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