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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/win/scoped_winrt_initializer.h"
#include <roapi.h>
#include <windows.h>
#include "base/check_op.h"
#include "base/threading/scoped_thread_priority.h"
#include "base/win/com_init_util.h"
#include "base/win/core_winrt_util.h"
#include "base/win/windows_version.h"
namespace base {
namespace win {
namespace {
FARPROC LoadComBaseFunction(const char* function_name) {
static HMODULE const handle = []() {
// Mitigate the issues caused by loading DLLs on a background thread
// (http://crbug/973868).
SCOPED_MAY_LOAD_LIBRARY_AT_BACKGROUND_PRIORITY();
return ::LoadLibraryEx(L"combase.dll", nullptr,
LOAD_LIBRARY_SEARCH_SYSTEM32);
}();
return handle ? ::GetProcAddress(handle, function_name) : nullptr;
}
decltype(&::RoInitialize) GetRoInitializeFunction() {
static decltype(&::RoInitialize) const function =
reinterpret_cast<decltype(&::RoInitialize)>(
LoadComBaseFunction("RoInitialize"));
return function;
}
decltype(&::RoUninitialize) GetRoUninitializeFunction() {
static decltype(&::RoUninitialize) const function =
reinterpret_cast<decltype(&::RoUninitialize)>(
LoadComBaseFunction("RoUninitialize"));
return function;
}
HRESULT CallRoInitialize(RO_INIT_TYPE init_type) {
auto ro_initialize_func = GetRoInitializeFunction();
if (!ro_initialize_func)
return E_FAIL;
return ro_initialize_func(init_type);
}
void CallRoUninitialize() {
auto ro_uninitialize_func = GetRoUninitializeFunction();
if (ro_uninitialize_func)
ro_uninitialize_func();
}
} // namespace
ScopedWinrtInitializer::ScopedWinrtInitializer()
: hr_(CallRoInitialize(RO_INIT_MULTITHREADED)) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK_GE(GetVersion(), Version::WIN8);
#if DCHECK_IS_ON()
if (SUCCEEDED(hr_))
AssertComApartmentType(ComApartmentType::MTA);
else
DCHECK_NE(RPC_E_CHANGED_MODE, hr_) << "Invalid COM thread model change";
#endif
}
ScopedWinrtInitializer::~ScopedWinrtInitializer() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
if (SUCCEEDED(hr_))
CallRoUninitialize();
}
bool ScopedWinrtInitializer::Succeeded() const {
return SUCCEEDED(hr_);
}
} // namespace win
} // namespace base
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