ASImageNode(Debugging) Category Reference
Enables an ASImageNode debug label that shows the ratio of pixels in the source image to those in the displayed bounds (including cropRect). This helps detect excessive image fetching / downscaling, as well as upscaling (such as providing a URL not suitable for a Retina device). For dev purposes only.
Specify YES to show the label on all ASImageNodes with non-1.0x source-to-bounds pixel ratio.