@mixin image-rendering ($mode:auto) {

@if ($mode == crisp-edges) {
  -ms-interpolation-mode: nearest-neighbor; // IE8+
  image-rendering: -moz-crisp-edges;
  image-rendering: -o-crisp-edges;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
}

@else {
  image-rendering: $mode;
}

}