Compass Sprite Generator Mixin

compass-sprite-background.scss

$sprites: sprite-map("sprites/*.png", $spacing: 15px);
$sprites2x: sprite-map("sprites2x/*.png", $spacing: 30px);


@mixin sprite-background($name) {
  background-image: sprite-url($sprites);
  background-position: sprite-position($sprites, $name);
  background-repeat: no-repeat;
  display: block;
  height: image-height(sprite-file($sprites, $name));
  width: image-width(sprite-file($sprites, $name));
  @media (-webkit-min-device-pixel-ratio: 1.5), (min-resolution: 144dpi) {
    // Workaround for https://gist.github.com/2140082
    @if (sprite-position($sprites, $name) != sprite-position($sprites2x, $name)) {
      $ypos: round(nth(sprite-position($sprites2x, $name), 2) / 2);
      background-position: 0 $ypos;
    }
    // Hard coded width of the normal sprite image. There must be a smarter way to do this.
    @include background-size($normal-sprite-width auto);
    background-image: sprite-url($sprites2x);
  }
}