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https://bitbucket.org/chromiumembedded/cef
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147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
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// Copyright (c) 2009 The Chromium Embedded Framework Authors. All rights
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// reserved. Use of this source code is governed by a BSD-style license that
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// can be found in the LICENSE file.
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#ifndef CEF_LIBCEF_DLL_CPPTOC_BASE_CPPTOC_H_
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#define CEF_LIBCEF_DLL_CPPTOC_BASE_CPPTOC_H_
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#pragma once
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#include "include/cef_base.h"
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#include "include/capi/cef_base_capi.h"
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#include "libcef_dll/cef_logging.h"
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// CefCppToC implementation for CefBase.
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class CefBaseCppToC : public CefBase {
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public:
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// Use this method to retrieve the underlying class instance from our
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// own structure when the structure is passed as the required first
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// parameter of a C API function call. No explicit reference counting
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// is done in this case.
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static CefRefPtr<CefBase> Get(cef_base_t* s) {
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DCHECK(s);
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// Cast our structure to the wrapper structure type.
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CefBaseCppToC::Struct* wrapperStruct =
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reinterpret_cast<CefBaseCppToC::Struct*>(s);
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// Return the underlying object instance.
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return wrapperStruct->class_->GetClass();
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}
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// Use this method to create a wrapper structure for passing our class
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// instance to the other side.
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static cef_base_t* Wrap(CefRefPtr<CefBase> c) {
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if (!c.get())
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return NULL;
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// Wrap our object with the CefCppToC class.
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CefBaseCppToC* wrapper = new CefBaseCppToC(c);
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// Add a reference to our wrapper object that will be released once our
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// structure arrives on the other side.
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wrapper->AddRef();
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// Return the structure pointer that can now be passed to the other side.
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return wrapper->GetStruct();
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}
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// Use this method to retrieve the underlying class instance when receiving
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// our wrapper structure back from the other side.
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static CefRefPtr<CefBase> Unwrap(cef_base_t* s) {
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if (!s)
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return NULL;
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// Cast our structure to the wrapper structure type.
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CefBaseCppToC::Struct* wrapperStruct =
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reinterpret_cast<CefBaseCppToC::Struct*>(s);
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// Add the underlying object instance to a smart pointer.
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CefRefPtr<CefBase> objectPtr(wrapperStruct->class_->GetClass());
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// Release the reference to our wrapper object that was added before the
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// structure was passed back to us.
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wrapperStruct->class_->Release();
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// Return the underlying object instance.
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return objectPtr;
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}
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// Structure representation with pointer to the C++ class.
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struct Struct {
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cef_base_t struct_;
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CefBaseCppToC* class_;
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};
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explicit CefBaseCppToC(CefBase* cls)
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: class_(cls) {
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DCHECK(cls);
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struct_.class_ = this;
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// zero the underlying structure and set base members
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memset(&struct_.struct_, 0, sizeof(cef_base_t));
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struct_.struct_.size = sizeof(cef_base_t);
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struct_.struct_.add_ref = struct_add_ref;
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struct_.struct_.release = struct_release;
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struct_.struct_.get_refct = struct_get_refct;
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}
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virtual ~CefBaseCppToC() {}
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CefBase* GetClass() { return class_; }
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// If returning the structure across the DLL boundary you should call
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// AddRef() on this CefCppToC object. On the other side of the DLL boundary,
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// call UnderlyingRelease() on the wrapping CefCToCpp object.
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cef_base_t* GetStruct() { return &struct_.struct_; }
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// CefBase methods increment/decrement reference counts on both this object
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// and the underlying wrapper class.
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int AddRef() {
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UnderlyingAddRef();
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return refct_.AddRef();
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}
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int Release() {
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UnderlyingRelease();
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int retval = refct_.Release();
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if (retval == 0)
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delete this;
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return retval;
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}
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int GetRefCt() { return refct_.GetRefCt(); }
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// Increment/decrement reference counts on only the underlying class.
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int UnderlyingAddRef() { return class_->AddRef(); }
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int UnderlyingRelease() { return class_->Release(); }
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int UnderlyingGetRefCt() { return class_->GetRefCt(); }
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private:
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static int CEF_CALLBACK struct_add_ref(struct _cef_base_t* base) {
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DCHECK(base);
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if (!base)
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return 0;
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Struct* impl = reinterpret_cast<Struct*>(base);
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return impl->class_->AddRef();
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}
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static int CEF_CALLBACK struct_release(struct _cef_base_t* base) {
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DCHECK(base);
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if (!base)
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return 0;
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Struct* impl = reinterpret_cast<Struct*>(base);
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return impl->class_->Release();
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}
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static int CEF_CALLBACK struct_get_refct(struct _cef_base_t* base) {
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DCHECK(base);
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if (!base)
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return 0;
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Struct* impl = reinterpret_cast<Struct*>(base);
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return impl->class_->GetRefCt();
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}
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protected:
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CefRefCount refct_;
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Struct struct_;
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CefBase* class_;
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};
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#endif // CEF_LIBCEF_DLL_CPPTOC_BASE_CPPTOC_H_
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