I found that the newest cocos2d-x supported ATITC, S3TC and 3DC on the wiki.
But I didn’t find any method to load them in the newest Github version. So I wonder how to load them as a CCSprite.
Also, I wonder how to compress a png as those format. I try to compress the image using nvidia-texture-tools, DirectX tool and photoshop plugin. But, to be honest, they are not easy to use. Is there any tools better like TexturePacker?