具有缩放功能的全屏模式

Question

我具有更改应用程序窗口的窗口/全屏模式的功能：

void sr_WindowToggleFullscreen(void)
{
    static WINDOWPLACEMENT windowPrevPlacement;

    if (!sr_windowIsFullscreen) {
        GetWindowPlacement(hwnd, &windowPrevPlacement);
        SetWindowLong(hwnd, GWL_STYLE, WS_BORDER);
        SetWindowLong(hwnd, GWL_EXSTYLE, WS_EX_TOPMOST);
        ShowWindow(hwnd, SW_SHOWMAXIMIZED);
    } else {
        SetWindowLong(hwnd, GWL_STYLE, WS_OVERLAPPEDWINDOW | WS_VISIBLE);
        SetWindowLong(hwnd, GWL_EXSTYLE, 0L);
        SetWindowPlacement(hwnd, &windowPrevPlacement);
        ShowWindow(hwnd, SW_SHOWDEFAULT);
    }

    sr_windowIsFullscreen = !sr_windowIsFullscreen;
}

它给出了这样的结果：

如何在全屏模式下将客户区域缩放到屏幕尺寸？像这样：