SCSS Scaled Sprite Map

_ScaledSpriteMap.scss

@mixin scaled-sprite-background($name, $scale, $spritemap) {
	background: $spritemap;

	$spritePath: sprite-path($spritemap);
	@include background-size(image-width($spritePath) * $scale);

	$position: sprite-position($spritemap, $name);
	background-position: (nth($position, 1) * $scale) (nth($position, 2) * $scale);
	
	height: image-height(sprite-file($spritemap, $name)) * $scale;
	width: image-width(sprite-file($spritemap, $name)) * $scale;
}

usage.scss

@import "ScaledSpriteMap";
@import "compass/utilities/sprites";

$sprites: sprite-map("sprites/*.png");

.example {
	@include scaled-sprite-background(spritename, .5, $sprites);
}