bool Display::hasExistingWindowSurface(EGLNativeWindowType window)
{
    WindowSurfaceMap *windowSurfaces = GetWindowSurfaces();
    ASSERT(windowSurfaces);

    return windowSurfaces->find(window) != windowSurfaces->end();
}

Error Display::createWindowSurface(const Config *configuration, EGLNativeWindowType window, const AttributeMap &attribs,
                                   Surface **outSurface)
{
    if (mImplementation->testDeviceLost())
    {
        Error error = restoreLostDevice();
        if (error.isError())
        {
            return error;
        }
    }

    rx::SurfaceImpl *surfaceImpl = mImplementation->createWindowSurface(configuration, window, attribs);
    ASSERT(surfaceImpl != nullptr);

    Error error = surfaceImpl->initialize();
    if (error.isError())
    {
        SafeDelete(surfaceImpl);
        return error;
    }

    Surface *surface = new Surface(surfaceImpl, EGL_WINDOW_BIT, configuration, attribs);
    mImplementation->getSurfaceSet().insert(surface);

    WindowSurfaceMap *windowSurfaces = GetWindowSurfaces();
    ASSERT(windowSurfaces && windowSurfaces->find(window) == windowSurfaces->end());
    windowSurfaces->insert(std::make_pair(window, surface));

    ASSERT(outSurface != nullptr);
    *outSurface = surface;
    return Error(EGL_SUCCESS);
}

Error Display::createWindowSurface(const Config *configuration, EGLNativeWindowType window, const AttributeMap &attribs,
                                   Surface **outSurface)
{
    if (mImplementation->testDeviceLost())
    {
        ANGLE_TRY(restoreLostDevice());
    }

    std::unique_ptr<Surface> surface(
        new WindowSurface(mImplementation, configuration, window, attribs));
    ANGLE_TRY(surface->initialize());

    ASSERT(outSurface != nullptr);
    *outSurface = surface.release();
    mImplementation->getSurfaceSet().insert(*outSurface);

    WindowSurfaceMap *windowSurfaces = GetWindowSurfaces();
    ASSERT(windowSurfaces && windowSurfaces->find(window) == windowSurfaces->end());
    windowSurfaces->insert(std::make_pair(window, *outSurface));

    return egl::Error(EGL_SUCCESS);
}