--- /dev/null
+// Copyright (c) 2009 The Chromium Embedded Framework Authors. All rights
+// reserved. Use of this source code is governed by a BSD-style license that
+// can be found in the LICENSE file.
+
+#ifndef CEF_LIBCEF_DLL_CTOCPP_CTOCPP_REF_COUNTED_H_
+#define CEF_LIBCEF_DLL_CTOCPP_CTOCPP_REF_COUNTED_H_
+#pragma once
+
+#include "include/base/cef_logging.h"
+#include "include/base/cef_macros.h"
+#include "include/cef_base.h"
+#include "include/capi/cef_base_capi.h"
+#include "libcef_dll/wrapper_types.h"
+
+// Wrap a C structure with a C++ class. This is used when the implementation
+// exists on the other side of the DLL boundary but will have methods called on
+// this side of the DLL boundary.
+template <class ClassName, class BaseName, class StructName>
+class CefCToCppRefCounted : public BaseName {
+ public:
+ // Create a new wrapper instance for a structure reference received from the
+ // other side.
+ static CefRefPtr<BaseName> Wrap(StructName* s);
+
+ // Retrieve the underlying structure reference from a wrapper instance for
+ // return back to the other side.
+ static StructName* Unwrap(CefRefPtr<BaseName> c);
+
+ // CefBaseRefCounted methods increment/decrement reference counts on both this
+ // object and the underlying wrapped structure.
+ void AddRef() const {
+ UnderlyingAddRef();
+ ref_count_.AddRef();
+ }
+ bool Release() const;
+ bool HasOneRef() const { return UnderlyingHasOneRef(); }
+
+#if DCHECK_IS_ON()
+ // Simple tracking of allocated objects.
+ static base::AtomicRefCount DebugObjCt; // NOLINT(runtime/int)
+#endif
+
+ protected:
+ CefCToCppRefCounted() {
+#if DCHECK_IS_ON()
+ base::AtomicRefCountInc(&DebugObjCt);
+#endif
+ }
+
+ virtual ~CefCToCppRefCounted() {
+#if DCHECK_IS_ON()
+ base::AtomicRefCountDec(&DebugObjCt);
+#endif
+ }
+
+ // If returning the structure across the DLL boundary use Unwrap() instead.
+ StructName* GetStruct() const {
+ WrapperStruct* wrapperStruct = GetWrapperStruct(this);
+ // Verify that the wrapper offset was calculated correctly.
+ DCHECK_EQ(kWrapperType, wrapperStruct->type_);
+ return wrapperStruct->struct_;
+ }
+
+ private:
+ // Used to associate this wrapper object and the structure reference received
+ // from the other side.
+ struct WrapperStruct;
+
+ static WrapperStruct* GetWrapperStruct(const BaseName* obj);
+
+ // Unwrap as the derived type.
+ static StructName* UnwrapDerived(CefWrapperType type, BaseName* c);
+
+ // Increment/decrement reference counts on only the underlying class.
+ void UnderlyingAddRef() const {
+ cef_base_ref_counted_t* base =
+ reinterpret_cast<cef_base_ref_counted_t*>(GetStruct());
+ if (base->add_ref)
+ base->add_ref(base);
+ }
+
+ bool UnderlyingRelease() const {
+ cef_base_ref_counted_t* base =
+ reinterpret_cast<cef_base_ref_counted_t*>(GetStruct());
+ if (!base->release)
+ return false;
+ return base->release(base) ? true : false;
+ }
+
+ bool UnderlyingHasOneRef() const {
+ cef_base_ref_counted_t* base =
+ reinterpret_cast<cef_base_ref_counted_t*>(GetStruct());
+ if (!base->has_one_ref)
+ return false;
+ return base->has_one_ref(base) ? true : false;
+ }
+
+ CefRefCount ref_count_;
+
+ static CefWrapperType kWrapperType;
+
+ DISALLOW_COPY_AND_ASSIGN(CefCToCppRefCounted);
+};
+
+template <class ClassName, class BaseName, class StructName>
+struct CefCToCppRefCounted<ClassName,BaseName,StructName>::WrapperStruct {
+ CefWrapperType type_;
+ StructName* struct_;
+ ClassName wrapper_;
+};
+
+template <class ClassName, class BaseName, class StructName>
+CefRefPtr<BaseName>
+ CefCToCppRefCounted<ClassName, BaseName, StructName>::Wrap(StructName* s) {
+ if (!s)
+ return NULL;
+
+ // Wrap their structure with the CefCToCppRefCounted object.
+ WrapperStruct* wrapperStruct = new WrapperStruct;
+ wrapperStruct->type_ = kWrapperType;
+ wrapperStruct->struct_ = s;
+
+ // Put the wrapper object in a smart pointer.
+ CefRefPtr<BaseName> wrapperPtr(&wrapperStruct->wrapper_);
+ // Release the reference that was added to the CefCppToC wrapper object on
+ // the other side before their structure was passed to us.
+ wrapperStruct->wrapper_.UnderlyingRelease();
+ // Return the smart pointer.
+ return wrapperPtr;
+}
+
+template <class ClassName, class BaseName, class StructName>
+StructName* CefCToCppRefCounted<ClassName, BaseName, StructName>::Unwrap(
+ CefRefPtr<BaseName> c) {
+ if (!c.get())
+ return NULL;
+
+ WrapperStruct* wrapperStruct = GetWrapperStruct(c.get());
+
+ // If the type does not match this object then we need to unwrap as the
+ // derived type.
+ if (wrapperStruct->type_ != kWrapperType)
+ return UnwrapDerived(wrapperStruct->type_, c.get());
+
+ // Add a reference to the CefCppToC wrapper object on the other side that
+ // will be released once the structure is received.
+ wrapperStruct->wrapper_.UnderlyingAddRef();
+ // Return their original structure.
+ return wrapperStruct->struct_;
+}
+
+template <class ClassName, class BaseName, class StructName>
+bool CefCToCppRefCounted<ClassName, BaseName, StructName>::Release() const {
+ UnderlyingRelease();
+ if (ref_count_.Release()) {
+ WrapperStruct* wrapperStruct = GetWrapperStruct(this);
+ // Verify that the wrapper offset was calculated correctly.
+ DCHECK_EQ(kWrapperType, wrapperStruct->type_);
+ delete wrapperStruct;
+ return true;
+ }
+ return false;
+}
+
+template <class ClassName, class BaseName, class StructName>
+typename CefCToCppRefCounted<ClassName, BaseName, StructName>::WrapperStruct*
+ CefCToCppRefCounted<ClassName, BaseName, StructName>::GetWrapperStruct(
+ const BaseName* obj) {
+ // Offset using the WrapperStruct size instead of individual member sizes to
+ // avoid problems due to platform/compiler differences in structure padding.
+ return reinterpret_cast<WrapperStruct*>(
+ reinterpret_cast<char*>(const_cast<BaseName*>(obj)) -
+ (sizeof(WrapperStruct) - sizeof(ClassName)));
+}
+
+#endif // CEF_LIBCEF_DLL_CTOCPP_CTOCPP_REF_COUNTED_H_
projects / casparcg / blobdiff