@mixin build-sprites($name, $images, $size: normal)
  $sprite-names: sprite-names($images)
  
  .#{$name}-sprite-map 
    background-image: $images
    background-repeat: no-repeat

    $width: 0px
    @each $sprite-name in $sprite-names 
      @if $sprite-name != nil and $images != nil
        $tmp-width: image-width(sprite-file($images, $sprite-name))
        @if $tmp-width > $width
          $width: $tmp-width
    @if $size == retina
      @include background-size($width/2 auto)

  @each $sprite-name in $sprite-names
    $full-sprite-name: "#{$name}-#{$sprite-name}"
    .#{$full-sprite-name}-no-dimensions
      @extend .#{$name}-sprite-map
      @include sprite($images, $sprite-name)

    $spt_pos: sprite-position($images, $sprite-name)
    $xpos: 0
    $ypos: 0
    $width: 0
    $height: 0
    @if $size == retina
      $xpos: round(nth($spt_pos, 1) / 2)
      $ypos: round(nth($spt_pos, 2) / 2)
      $height: image-height(sprite-file($images, $sprite-name))/2
      $width: image-width(sprite-file($images, $sprite-name))/2
    @else
      $xpos: round(nth($spt_pos, 1))
      $ypos: round(nth($spt_pos, 2))
      $height: image-height(sprite-file($images, $sprite-name))
      $width: image-width(sprite-file($images, $sprite-name))

    .#{$full-sprite-name}-half-x
      left: -($width/2)
    .#{$full-sprite-name}-half-y
      top: -($height/2)

    .#{$full-sprite-name}
      @extend .#{$name}-sprite-map
      //@include sprite-background-position($images, $sprite-name)
      background-position: $xpos $ypos
      width: $width
      height: $height