1 // Image Mixins

     2 // - Responsive image

     3 // - Retina image

     4 

     5 

     6 // Responsive image

     7 //

     8 // Keep images from scaling beyond the width of their parents.

     9 @mixin img-responsive($display: block) {

    10   display: $display;

    11   max-width: 100%; // Part 1: Set a maximum relative to the parent

    12   height: auto; // Part 2: Scale the height according to the width, otherwise you get stretching

    13 }

    14 

    15 

    16 // Retina image

    17 //

    18 // Short retina mixin for setting background-image and -size. Note that the

    19 // spelling of `min--moz-device-pixel-ratio` is intentional.

    20 @mixin img-retina($file-1x, $file-2x, $width-1x, $height-1x) {

    21   background-image: url(if($bootstrap-sass-asset-helper, twbs-image-path("#{$file-1x}"), "#{$file-1x}"));

    22 

    23   @media

    24   only screen and (-webkit-min-device-pixel-ratio: 2),

    25   only screen and (   min--moz-device-pixel-ratio: 2),

    26   only screen and (     -o-min-device-pixel-ratio: 2/1),

    27   only screen and (        min-device-pixel-ratio: 2),

    28   only screen and (                min-resolution: 192dpi),

    29   only screen and (                min-resolution: 2dppx) {

    30     background-image: url(if($bootstrap-sass-asset-helper, twbs-image-path("#{$file-2x}"), "#{$file-2x}"));

    31     background-size: $width-1x $height-1x;

    32   }

    33 }