cef/include/wrapper/cef_helpers.h

159 lines
6.3 KiB
C++

// Copyright (c) 2014 Marshall A. Greenblatt. 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 name Chromium Embedded
// Framework 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.
//
// ---------------------------------------------------------------------------
//
// The contents of this file are only available to applications that link
// against the libcef_dll_wrapper target.
//
#ifndef CEF_INCLUDE_WRAPPER_CEF_HELPERS_H_
#define CEF_INCLUDE_WRAPPER_CEF_HELPERS_H_
#pragma once
#include <cstring>
#include <string>
#include <vector>
#include "include/base/cef_bind.h"
#include "include/base/cef_logging.h"
#include "include/cef_task.h"
#define CEF_REQUIRE_UI_THREAD() DCHECK(CefCurrentlyOn(TID_UI));
#define CEF_REQUIRE_IO_THREAD() DCHECK(CefCurrentlyOn(TID_IO));
#define CEF_REQUIRE_FILE_BACKGROUND_THREAD() \
DCHECK(CefCurrentlyOn(TID_FILE_BACKGROUND));
#define CEF_REQUIRE_FILE_USER_VISIBLE_THREAD() \
DCHECK(CefCurrentlyOn(TID_FILE_USER_VISIBLE));
#define CEF_REQUIRE_FILE_USER_BLOCKING_THREAD() \
DCHECK(CefCurrentlyOn(TID_FILE_USER_BLOCKING));
#define CEF_REQUIRE_RENDERER_THREAD() DCHECK(CefCurrentlyOn(TID_RENDERER));
// Use this struct in conjuction with refcounted types to ensure that an
// object is deleted on the specified thread. For example:
//
// class Foo : public base::RefCountedThreadSafe<Foo, CefDeleteOnUIThread> {
// public:
// Foo();
// void DoSomething();
//
// private:
// // Allow deletion via scoped_refptr only.
// friend struct CefDeleteOnThread<TID_UI>;
// friend class base::RefCountedThreadSafe<Foo, CefDeleteOnUIThread>;
//
// virtual ~Foo() {}
// };
//
// base::scoped_refptr<Foo> foo = new Foo();
// foo->DoSomething();
// foo = NULL; // Deletion of |foo| will occur on the UI thread.
//
template <CefThreadId thread>
struct CefDeleteOnThread {
template <typename T>
static void Destruct(const T* x) {
if (CefCurrentlyOn(thread)) {
delete x;
} else {
CefPostTask(thread,
base::BindOnce(&CefDeleteOnThread<thread>::Destruct<T>,
base::Unretained(x)));
}
}
};
struct CefDeleteOnUIThread : public CefDeleteOnThread<TID_UI> {};
struct CefDeleteOnIOThread : public CefDeleteOnThread<TID_IO> {};
struct CefDeleteOnFileBackgroundThread
: public CefDeleteOnThread<TID_FILE_BACKGROUND> {};
struct CefDeleteOnFileUserVisibleThread
: public CefDeleteOnThread<TID_FILE_USER_VISIBLE> {};
struct CefDeleteOnFileUserBlockingThread
: public CefDeleteOnThread<TID_FILE_USER_BLOCKING> {};
struct CefDeleteOnRendererThread : public CefDeleteOnThread<TID_RENDERER> {};
// Same as IMPLEMENT_REFCOUNTING() but using the specified Destructor.
#define IMPLEMENT_REFCOUNTING_EX(ClassName, Destructor) \
public: \
void AddRef() const override { ref_count_.AddRef(); } \
bool Release() const override { \
if (ref_count_.Release()) { \
Destructor::Destruct(this); \
return true; \
} \
return false; \
} \
bool HasOneRef() const override { return ref_count_.HasOneRef(); } \
bool HasAtLeastOneRef() const override { \
return ref_count_.HasAtLeastOneRef(); \
} \
\
private: \
CefRefCount ref_count_
#define IMPLEMENT_REFCOUNTING_DELETE_ON_UIT(ClassName) \
IMPLEMENT_REFCOUNTING_EX(ClassName, CefDeleteOnUIThread)
#define IMPLEMENT_REFCOUNTING_DELETE_ON_IOT(ClassName) \
IMPLEMENT_REFCOUNTING_EX(ClassName, CefDeleteOnIOThread)
///
// Helper class to manage a scoped copy of |argv|.
///
class CefScopedArgArray {
public:
CefScopedArgArray(int argc, char* argv[]) {
// argv should have (argc + 1) elements, the last one always being NULL.
array_ = new char*[argc + 1];
values_.resize(argc);
for (int i = 0; i < argc; ++i) {
values_[i] = argv[i];
array_[i] = const_cast<char*>(values_[i].c_str());
}
array_[argc] = NULL;
}
CefScopedArgArray(const CefScopedArgArray&) = delete;
CefScopedArgArray& operator=(const CefScopedArgArray&) = delete;
~CefScopedArgArray() { delete[] array_; }
char** array() const { return array_; }
private:
char** array_;
// Keep values in a vector separate from |array_| because various users may
// modify |array_| and we still want to clean up memory properly.
std::vector<std::string> values_;
};
#endif // CEF_INCLUDE_WRAPPER_CEF_HELPERS_H_