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@mixin retina-image($filename, $background-size, $extension: png, $retina-filename: null, $retina-suffix: _2x, $asset-pipeline: $asset-pipeline) {
  @include _bourbon-deprecate("retina-image");

  @if $asset-pipeline {
    background-image: image-url("#{$filename}.#{$extension}");
  } @else {
    background-image:       url("#{$filename}.#{$extension}");
  }

  @include hidpi {
    @if $asset-pipeline {
      @if $retina-filename {
        background-image: image-url("#{$retina-filename}.#{$extension}");
      } @else {
        background-image: image-url("#{$filename}#{$retina-suffix}.#{$extension}");
      }
    } @else {
      @if $retina-filename {
        background-image: url("#{$retina-filename}.#{$extension}");
      } @else {
        background-image: url("#{$filename}#{$retina-suffix}.#{$extension}");
      }
    }

    background-size: $background-size;
  }
}