Plugin retina.js (or other retina method?)

Hi!

First, thanks Justin for this plugin – it’s perfect for what I’m looking for!

Just one question – I’m using retina.js to serve retina images to HiDPI devices, so I have two of each image – standard.png and standard@2x.png. Everything seems to be captured by it, but I had to add some code to get the CSS ones to work:

@media only screen and (-Webkit-min-device-pixel-ratio: 1.5),
only screen and (-moz-min-device-pixel-ratio: 1.5),
only screen and (-o-min-device-pixel-ratio: 3/2),
only screen and (min-device-pixel-ratio: 1.5) {
 // classes go here
}

Is there a way of adapting the plugin to use that code to load the same image name with the same attributes (e.g. top, vertical, etc), but just add @2x onto the end of the image name? I had a look, but I’m not very familiar with plugins and couldn’t work it out.

EDIT: Also, just realised the width and height would need to be half the retina image size (and thus the same as the original image size)…

Many thanks!

https://wordpress.org/plugins/custom-background-extended/