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resize sprites in Compass
@mixin resize-sprite($map, $sprite, $percent) {
$spritePath: sprite-path($map);
$spriteWidth: image-width($spritePath);
$spriteHeight: image-height($spritePath);
$width: image-width(sprite-file($map, $sprite));
$height: image-height(sprite-file($map, $sprite));
@include background-size(ceil($spriteWidth * ($percent/100)) ceil($spriteHeight * ($percent/100)));
width: ceil($width*($percent/100));
height: ceil($height*($percent/100));
background-position: 0 floor(nth(sprite-position($map, $sprite), 2) * ($percent/100) );
}
@escapedcat

Great mixin! But is it somehow possible to recreate all sprite-map classes again automatically for the second size?
I created a question here:
http://stackoverflow.com/questions/14135256/how-to-create-a-sprite-from-a-folder-with-and-without-background-size-using-com

@wilkerlucio

hey, I did extend your implementation, also added files with usage examples: https://gist.github.com/wilkerlucio/6442309

my version has a mixin that resizes all the icons at once, which may be helpful :)

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