Font-Awesome/less/mixins.less

// Mixins
// --------------------------

.icon(@icon) {
  .icon-FontAwesome();
  content: @icon;
}

.icon-FontAwesome() {
//  position: relative;
//  top: 0;
  display: inline-block;
  font-family: FontAwesome;
  font-style: normal;
  font-weight: normal;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

  // from bootstrap, throws off rendering
//  &:empty { width: 1em; }

//  text-decoration: inherit;
//  text-rendering: auto;
}

.border-radius(@radius) {
  -webkit-border-radius: @radius;
  -moz-border-radius: @radius;
  border-radius: @radius;
}

.rotate(@degrees, @rotation) {
  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=@rotation);
  -webkit-transform: rotate(@degrees);
     -moz-transform: rotate(@degrees);
      -ms-transform: rotate(@degrees);
       -o-transform: rotate(@degrees);
          transform: rotate(@degrees);
}

.flip(@horiz, @vert) {
  -webkit-transform: scale(@horiz, @vert);
     -moz-transform: scale(@horiz, @vert);
      -ms-transform: scale(@horiz, @vert);
       -o-transform: scale(@horiz, @vert);
          transform: scale(@horiz, @vert);
}

.icon-stack(@width: 2em, @height: 2em, @top-font-size: 1em, @base-font-size: 2em) {
  .fa-stack {
    position: relative;
    display: inline-block;
    width: @width;
    height: @height;
    line-height: @width;
    vertical-align: -35%;
    .fa {
      position: absolute;
      display: block;
      width: 100%;
      height: 100%;
      font-size: @top-font-size;
      line-height: inherit;
      *line-height: @height;
      text-align: center;
    }
    .fa-stack-base {
      font-size: @base-font-size;
      *line-height: (@height / @base-font-size);
    }
  }
}