useful scss mixins

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

@mixin fa-icon() {
  display: inline-block;
  font: normal normal normal #{$fa-font-size-base}/#{$fa-line-height-base} FontAwesome; // shortening font declaration
  font-size: inherit; // can't have font-size inherit on line above, so need to override
  text-rendering: auto; // optimizelegibility throws things off #1094
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

}

@mixin fa-icon-rotate($degrees, $rotation) {
  -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=#{$rotation})";
  -webkit-transform: rotate($degrees);
      -ms-transform: rotate($degrees);
          transform: rotate($degrees);
}

@mixin fa-icon-flip($horiz, $vert, $rotation) {
  -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=#{$rotation}, mirror=1)";
  -webkit-transform: scale($horiz, $vert);
      -ms-transform: scale($horiz, $vert);
          transform: scale($horiz, $vert);
}


// Only display content to screen readers. A la Bootstrap 4.
//
// See: http://a11yproject.com/posts/how-to-hide-content/

@mixin sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

// Use in conjunction with .sr-only to only display content when it's focused.
//
// Useful for "Skip to main content" links; see http://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
//
// Credit: HTML5 Boilerplate

@mixin sr-only-focusable {
  &:active,
  &:focus {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip: auto;
  }
}


@mixin border-radius($topleft, $topright, $bottomright, $bottomleft) {
  border-top-left-radius: $topleft;
  border-top-right-radius: $topright;
  border-bottom-right-radius: $bottomright;
  border-bottom-left-radius: $bottomleft;
  -webkit-border-top-left-radius: $topleft;
  -webkit-border-top-right-radius: $topright;
  -webkit-border-bottom-right-radius: $bottomright;
  -webkit-border-bottom-left-radius: $bottomleft;
  -moz-border-radius-topleft: $topleft;
  -moz-border-radius-topright: $topright;
  -moz-border-radius-bottomright: $bottomright;
  -moz-border-radius-bottomleft: $bottomleft;
  background-clip: padding-box;
  /* stops bg color from leaking outside the border: */
}

@mixin background-img($imgpath, $position:center, $repeat: no-repeat, $size:contain) {
  background: {
    image: url($imgpath);
    position: $position;
    repeat: $repeat;
    size: $size;
  }
}

@mixin blur ($radius) {
	-webkit-filter: blur($radius+px); /* Chrome, Safari */
	-ms-filter: blur($radius+px); /* IE12? */
	filter: url("data:image/svg+xml;utf8,<svg version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\"><filter id=\"blur\"><feGaussianBlur stdDeviation=\"#{$radius}\" /></filter></svg>#blur"); /* Firefox, Safari, Chrome*/
	filter: progid:DXImageTransform.Microsoft.Blur(Strength=$radius); /* IE9 */
}

//Fontface
@import "variables";

@each $font-face in $font,  $font-bold, $font-bold-italic, $font-extra-bold, $font-italic, $font-light, $font-semibold, $font-semibold-italic, $font-light-italic  {
  @font-face {
    font-family: $font-face; font-style: normal; font-weight: normal;
    src: url('../fonts/#{$font-face}.eot');
    src: url('../fonts/#{$font-face}.eot?') format('eot'),
         url('../fonts/#{$font-face}.woff') format('woff'),
         url('../fonts/#{$font-face}.ttf')  format('truetype'),
         url('../fonts/#{$font-face}.svg##{$font}') format('svg');
  }
}