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Auto Hi-res Sprites
@import compass
$icons: sprite-map("icons/*.png")
$icons-hd: sprite-map("icons-hd/*.png")
i
background: $icons
display: inline-block
@media (-webkit-min-device-pixel-ratio: 1.5), (min-resolution: 144dpi)
background: $icons-hd
+background-size(image-width(sprite-path($icons)) auto)
@each $icon in sprite_names($icons)
.icn-#{$icon}
+sprite-dimensions($icons, $icon)
background-position: sprite-position($icons, $icon)
@media (-webkit-min-device-pixel-ratio: 1.5), (min-resolution: 144dpi)
$offset: nth(sprite-position($icons-hd, $icon), 2) / 2
background-position: 0 $offset
@nickawalsh
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nickawalsh commented Dec 7, 2012

Grabs all png files from images/icons and creates a sprite. Each file has a class of icn-filename created, with the appropriate dimensions and background position. At the same time, a sprite is compiled from double-resolution images (using the same file names, in images/icons-hd) and set with the appropriate media query.

Needs a bit of adjustment if you plan on adding $spacing to the generated sprite or use a layout other than vertical.

@nickawalsh
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nickawalsh commented Dec 7, 2012

You'll likely want to include some sort of image replacement technique on i, for places where fallback text is appropriate.

@Miggz
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Miggz commented Dec 28, 2012

This is awesome. One issue that I see is when zooming in FF or IE. once I zoom in far enough, the image switches to the hd image, but he background-size no longer seems to work. Not sure if this is a bug, or how to compensate for this, but I'm looking at it right now.

@Miggz
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Miggz commented Dec 28, 2012

So I came up with two ways to remedy this. One is to set the +background-size inside of the @each. The downside to this will write a lot of extra css. Extra statement for every icon.

The alternative I used was to call the background on i with an !important and this will force it everywhere.

example: background-size: image-width(sprite-path($sprites)), auto !important;

This is not perfect, but in this situation I feel like the !important is the lesser of evils.

Thanks again for this great snippet.

@nickawalsh
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nickawalsh commented Feb 4, 2013

Huh, that's really interesting - thanks for posting your findings (and sorry I missed them the first time around). I'll let you know if we stumble across a way to fix that without the extra duplication.

@nickawalsh
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nickawalsh commented Mar 8, 2013

Important fix for retina icon serving - the background-size declaration needs to come after the background declaration.

@dariye
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dariye commented May 14, 2013

Thanks nick. I just wrapped up Assembling Sass 2

@AlexRule7
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AlexRule7 commented May 23, 2013

$icons    : sprite-map("icons/*.png", $layout: smart)
$icons-hd : sprite-map("icons-hd/*.png")

$layout: smart — will save some kb for you. But use it only with non-retina sprite.

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