//
// Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// Trim11.cpp: Trim support utility class.

#include "libANGLE/renderer/d3d/d3d11/Trim11.h"
#include "libANGLE/renderer/d3d/d3d11/Renderer11.h"
#include "libANGLE/renderer/d3d/d3d11/renderer11_utils.h"

#if defined (ANGLE_ENABLE_WINDOWS_STORE)
using namespace ABI::Windows::Foundation;
using namespace ABI::Windows::ApplicationModel;
using namespace ABI::Windows::ApplicationModel::Core;
#endif

namespace rx
{

Trim11::Trim11(rx::Renderer11 *renderer)
    : mRenderer(renderer)
{
    bool result = true;
    result = registerForRendererTrimRequest();
    ASSERT(result);
}

Trim11::~Trim11()
{
    unregisterForRendererTrimRequest();
}

void Trim11::trim()
{
    if (!mRenderer)
    {
        return;
    }

#if defined (ANGLE_ENABLE_WINDOWS_STORE)
    ID3D11Device* device = mRenderer->getDevice();
    // IDXGIDevice3 is only supported on Windows 8.1 and Windows Phone 8.1 and above.
    IDXGIDevice3 *dxgiDevice3 = d3d11::DynamicCastComObject<IDXGIDevice3>(device);
    if (dxgiDevice3)
    {
        dxgiDevice3->Trim();
    }
    SafeRelease(dxgiDevice3);
#endif
}

bool Trim11::registerForRendererTrimRequest()
{
#if defined (ANGLE_ENABLE_WINDOWS_STORE)
    ICoreApplication* coreApplication = nullptr;
    HRESULT result = GetActivationFactory(HStringReference(RuntimeClass_Windows_ApplicationModel_Core_CoreApplication).Get(), &coreApplication);
    if (SUCCEEDED(result))
    {
        auto suspendHandler = Callback<IEventHandler<SuspendingEventArgs*>>(
            [this](IInspectable*, ISuspendingEventArgs*) -> HRESULT
        {
            trim();
            return S_OK;
        });
        result = coreApplication->add_Suspending(suspendHandler.Get(), &mApplicationSuspendedEventToken);
    }
    SafeRelease(coreApplication);

    if (FAILED(result))
    {
        return false;
    }
#endif
    return true;
}

void Trim11::unregisterForRendererTrimRequest()
{
#if defined (ANGLE_ENABLE_WINDOWS_STORE)
    if (mApplicationSuspendedEventToken.value != 0)
    {
        ICoreApplication* coreApplication = nullptr;
        if (SUCCEEDED(GetActivationFactory(HStringReference(RuntimeClass_Windows_ApplicationModel_Core_CoreApplication).Get(), &coreApplication)))
        {
            coreApplication->remove_Suspending(mApplicationSuspendedEventToken);
        }
        mApplicationSuspendedEventToken.value = 0;
        SafeRelease(coreApplication);
    }
#endif
}

}