DFBWindowID createWindow(shared_ptr& desc);

DFBWindowID : int

desc = {
    int x,
    int y,
    int width,
    int height,
    DisplayDevice::DisplayType deviceType,
}

void destroyWindow(DFBWindowID windowID, DisplayDevice::DisplayType deviceType = DisplayDevice::DisplayType::DISPLAY_PRIMARY);

DFBTaskID draw(DFBWindowID windowID, shared_ptr& cmd);

DFBTaskID : int

cmd所有对象成员均为caps类型，每个子对象代表一条绘制指令
cmd = {
    {
        ElementType type = ELEMENT_IMAGE,
        char *url,
        ImageLayout layout,
    },
    {
        ElementType type = ELEMENT_STRING,
        char *text,
        StringLayout layout,
        int x,
        int y,
        int fontSize,
        Color color = 0xffffffff,
        string font,
    }
}
Color : uint32_t

void getFBinfo(shared_ptr& info);

info = {
    {
        DisplayDevice::DisplayType displayType = DisplayDevice::DisplayType::DISPLAY_PRIMARY,
        int width,
        int height,
    }
}