SpriteKit RGBA444_COMPRESSED doubles the size on screen

问题

I am running a SpriteKit game on iPhone4, iOS7.1 When I select the regular RGBA888 texture atlas format it looks good, however, when I try to use RGBA444_COMPRESSED, all atlas textures are double the size as if the display is not retina.

Any ideas?

来源：https://stackoverflow.com/questions/32467883/spritekit-rgba444-compressed-doubles-the-size-on-screen