Branch CEF3 files from /branches/cef3 to /trunk/cef3 (issue #564).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@571 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef_dll/cpptoc/cpptoc.h

@@ -0,0 +1,160 @@
+// 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_CPPTOC_CPPTOC_H_
+#define CEF_LIBCEF_DLL_CPPTOC_CPPTOC_H_
+#pragma once
+
+#include "include/cef_base.h"
+#include "include/capi/cef_base_capi.h"
+#include "libcef_dll/cef_logging.h"
+
+
+// Wrap a C++ class with a C structure.  This is used when the class
+// implementation exists on this side of the DLL boundary but will have methods
+// called from the other side of the DLL boundary.
+template <class ClassName, class BaseName, class StructName>
+class CefCppToC : public CefBase {
+ public:
+  // Structure representation with pointer to the C++ class.
+  struct Struct {
+    StructName struct_;
+    CefCppToC<ClassName, BaseName, StructName>* class_;
+  };
+
+  // Use this method to retrieve the underlying class instance from our
+  // own structure when the structure is passed as the required first
+  // parameter of a C API function call. No explicit reference counting
+  // is done in this case.
+  static CefRefPtr<BaseName> Get(StructName* s) {
+    DCHECK(s);
+
+    // Cast our structure to the wrapper structure type.
+    Struct* wrapperStruct = reinterpret_cast<Struct*>(s);
+    // Return the underlying object instance.
+    return wrapperStruct->class_->GetClass();
+  }
+
+  // Use this method to create a wrapper structure for passing our class
+  // instance to the other side.
+  static StructName* Wrap(CefRefPtr<BaseName> c) {
+    if (!c.get())
+      return NULL;
+
+    // Wrap our object with the CefCppToC class.
+    ClassName* wrapper = new ClassName(c);
+    // Add a reference to our wrapper object that will be released once our
+    // structure arrives on the other side.
+    wrapper->AddRef();
+    // Return the structure pointer that can now be passed to the other side.
+    return wrapper->GetStruct();
+  }
+
+  // Use this method to retrieve the underlying class instance when receiving
+  // our wrapper structure back from the other side.
+  static CefRefPtr<BaseName> Unwrap(StructName* s) {
+    if (!s)
+      return NULL;
+
+    // Cast our structure to the wrapper structure type.
+    Struct* wrapperStruct = reinterpret_cast<Struct*>(s);
+    // Add the underlying object instance to a smart pointer.
+    CefRefPtr<BaseName> objectPtr(wrapperStruct->class_->GetClass());
+    // Release the reference to our wrapper object that was added before the
+    // structure was passed back to us.
+    wrapperStruct->class_->Release();
+    // Return the underlying object instance.
+    return objectPtr;
+  }
+
+  explicit CefCppToC(BaseName* cls)
+    : class_(cls) {
+    DCHECK(cls);
+
+    struct_.class_ = this;
+
+    // zero the underlying structure and set base members
+    memset(&struct_.struct_, 0, sizeof(StructName));
+    struct_.struct_.base.size = sizeof(StructName);
+    struct_.struct_.base.add_ref = struct_add_ref;
+    struct_.struct_.base.release = struct_release;
+    struct_.struct_.base.get_refct = struct_get_refct;
+
+#ifndef NDEBUG
+    CefAtomicIncrement(&DebugObjCt);
+#endif
+  }
+  virtual ~CefCppToC() {
+#ifndef NDEBUG
+    CefAtomicDecrement(&DebugObjCt);
+#endif
+  }
+
+  BaseName* GetClass() { return class_; }
+
+  // If returning the structure across the DLL boundary you should call
+  // AddRef() on this CefCppToC object.  On the other side of the DLL boundary,
+  // call UnderlyingRelease() on the wrapping CefCToCpp object.
+  StructName* GetStruct() { return &struct_.struct_; }
+
+  // CefBase methods increment/decrement reference counts on both this object
+  // and the underlying wrapper class.
+  int AddRef() {
+    UnderlyingAddRef();
+    return refct_.AddRef();
+  }
+  int Release() {
+    UnderlyingRelease();
+    int retval = refct_.Release();
+    if (retval == 0)
+      delete this;
+    return retval;
+  }
+  int GetRefCt() { return refct_.GetRefCt(); }
+
+  // Increment/decrement reference counts on only the underlying class.
+  int UnderlyingAddRef() { return class_->AddRef(); }
+  int UnderlyingRelease() { return class_->Release(); }
+  int UnderlyingGetRefCt() { return class_->GetRefCt(); }
+
+#ifndef NDEBUG
+  // Simple tracking of allocated objects.
+  static long DebugObjCt;  // NOLINT(runtime/int)
+#endif
+
+ private:
+  static int CEF_CALLBACK struct_add_ref(struct _cef_base_t* base) {
+    DCHECK(base);
+    if (!base)
+      return 0;
+
+    Struct* impl = reinterpret_cast<Struct*>(base);
+    return impl->class_->AddRef();
+  }
+
+  static int CEF_CALLBACK struct_release(struct _cef_base_t* base) {
+    DCHECK(base);
+    if (!base)
+      return 0;
+
+    Struct* impl = reinterpret_cast<Struct*>(base);
+    return impl->class_->Release();
+  }
+
+  static int CEF_CALLBACK struct_get_refct(struct _cef_base_t* base) {
+    DCHECK(base);
+    if (!base)
+      return 0;
+
+    Struct* impl = reinterpret_cast<Struct*>(base);
+    return impl->class_->GetRefCt();
+  }
+
+ protected:
+  CefRefCount refct_;
+  Struct struct_;
+  BaseName* class_;
+};
+
+#endif  // CEF_LIBCEF_DLL_CPPTOC_CPPTOC_H_