将Sprite转换为Image。

//
//获取精灵的CCImage
Image* HelloWorld::createImageFromSprite(Sprite* sp)
{
	Sprite* pNewSpr = Sprite::createWithSpriteFrame(sp->getSpriteFrame());
	pNewSpr->setAnchorPoint(Vec2::ZERO);
	RenderTexture* pRender = RenderTexture::create(pNewSpr->getContentSize().width, pNewSpr->getContentSize().height, Texture2D::PixelFormat::RGBA8888);
	pRender->begin();
	pNewSpr->visit();
	pRender->end();
	return pRender->newImage();
}
//