Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.3.2)
// ----

$images: (
  icon1: (0, 0),
  icon2: (0, 1),
  icon3: (5, 2)
);

@mixin iconSprite($size, $name) {
  $position: map-get($images, $name);  
  $row : nth($position, 1);
  $col: nth($position, 2);
  
  background-image: url(sprites/72/#{$size}.png);
  background-position: -$size*$row+px, -$size*$col+px;
  
  @media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    background-image: url(sprites/264/#{$size}.png);
    background-position: -$size*$row+px, -$size*$col+px;
    
    background-size: $size+px, $size+px;
  }
}

.btn-icon3 {
  @include iconSprite(24, icon3)
}

SassMeister-output.css

.btn-icon3 {
  background-image: url(sprites/72/24.png);
  background-position: -120px, -48px;
}

@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .btn-icon3 {
    background-image: url(sprites/264/24.png);
    background-position: -120px, -48px;
    background-size: 24px, 24px;
  }
}