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1 // Image Mixins
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2 // - Responsive image
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3 // - Retina image
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4
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5
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6 // Responsive image
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7 //
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8 // Keep images from scaling beyond the width of their parents.
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9
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10 @mixin img-fluid {
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11 // Part 1: Set a maximum relative to the parent
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12 max-width: 100%;
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13 // Part 2: Override the height to auto, otherwise images will be stretched
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14 // when setting a width and height attribute on the img element.
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15 height: auto;
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16 }
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17
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18
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19 // Retina image
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20 //
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21 // Short retina mixin for setting background-image and -size.
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22
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23 @mixin img-retina($file-1x, $file-2x, $width-1x, $height-1x) {
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24 background-image: url($file-1x);
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25
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26 // Autoprefixer takes care of adding -webkit-min-device-pixel-ratio and -o-min-device-pixel-ratio,
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27 // but doesn't convert dppx=>dpi.
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28 // There's no such thing as unprefixed min-device-pixel-ratio since it's nonstandard.
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29 // Compatibility info: http://caniuse.com/#feat=css-media-resolution
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30 @media
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31 only screen and (min-resolution: 192dpi), // IE9-11 don't support dppx
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32 only screen and (min-resolution: 2dppx) { // Standardized
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33 background-image: url($file-2x);
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34 background-size: $width-1x $height-1x;
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35 }
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36 }
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