Font-Awesome/less/mixins.less

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// mixins
// --------------------------
.fa-icon() {
display: inline-block;
font: normal normal normal @fa-font-size-base/1 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;
transform: translate(0, 0); // ensures no half-pixel rendering in firefox
}
.fa-icon-rotate(@degrees) {
// check if this ie fix is necessary
& when (mod(@degrees, 90) = 0) {
@rotation: @degrees / 90;
filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=@rotation);
}
-webkit-transform: rotate(~"@{degrees}deg");
-ms-transform: rotate(~"@{degrees}deg");
transform: rotate(~"@{degrees}deg");
}
.fa-icon-flip(@horiz, @vert, @rotation) {
filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=@rotation, mirror=1);
-webkit-transform: scale(@horiz, @vert);
-ms-transform: scale(@horiz, @vert);
transform: scale(@horiz, @vert);
}