SDL窗口加载gif后如何动态显示

如题，用SDL2创建了一个窗口，然后SDL_IMAGE2将gif加载并显示，可是在sdl窗口中只是gif的第一帧静态的显示在那，请问如何让gif在sdl窗口中动态显示呢？难道需要自己获取gif的每一帧？
部分关键代码

bool Game2::init(const char *title, int xpos, int ypos, int height, int width, int flags)

{

	if (SDL_Init(SDL_INIT_EVERYTHING) < 0)	return false;



	m_pWindow = SDL_CreateWindow(title, xpos, ypos, height, width, flags);

	if (NULL == m_pWindow)	return false;



	m_pRenderer = SDL_CreateRenderer(m_pWindow, -1, 0);

	

	SDL_SetRenderDrawColor(m_pRenderer, 255, 255, 255, 255);



	// new

	//SDL_Surface	*pTmpSurface = SDL_LoadBMP("D:\\sample.bmp");	// 按照实际更改图片名称及路径

	SDL_Surface	*pTmpSurface = IMG_Load("C:\\Users\\87070\\Desktop\\1.gif");

	if (NULL == pTmpSurface)	return false;



	m_pTexture	= SDL_CreateTextureFromSurface(m_pRenderer, pTmpSurface);

	if (NULL == m_pTexture)	return false;



	SDL_FreeSurface(pTmpSurface);

	

	SDL_QueryTexture(m_pTexture,NULL, NULL, &m_srcRect.w, &m_srcRect.h);

	m_dstRect.x = m_srcRect.x = 0;

	m_dstRect.y = m_srcRect.y = 0;

	// for debug

	//m_srcRect.w /= 2;

	//m_srcRect.h /= 2;

	

	m_dstRect.w = m_srcRect.w;

	m_dstRect.h = m_srcRect.h;