compass-image-set-mixins.scss

@mixin png-image-set($image){
 @include image-set($image, "png");
}
@mixin jpg-image-set($image){
 @include image-set($image, "jpg");
}
@mixin gif-image-set($image){
 @include image-set($image, "gif");
}
@mixin image-set($name,$extension){
  background-image: image_url("#{$name}.#{$extension}");
  background-image: -webkit-image-set(image_url("#{$name}.#{$extension}") 1x, image_url("#{$name}@2x.#{$extension}") 2x);
}