title: Compass: generate Sprites, plus width / height on each images in the sprite
body: <p>I'm using Compass (a CSS Framework) to generate sprite images.
  It work, but compass generate only a background-position for each image.</p>
  
  <p>Is it possible to get also the width and the height for each image in the sprite?</p>
  
  <p>This is my code:</p>
  
  <pre><code>@import "ico/*.png";
  @include all-ico-sprites;
  </code></pre>
  
  <p>The generated code:</p>
  
  <pre><code>.ico-sprite, .ico-bag-blue, .ico-bag-black {
    background: url('../images/ico-s78b1a1919b.png') no-repeat;
  }
  
  .ico-bag-blue {
    background-position: 0 0;
  }
  
  .ico-bag-black {
    background-position: 0 -24px;
  }
  </code></pre>
  
  <p>And the code i would like to have:</p>
  
  <pre><code>.ico-sprite, .ico-bag-blue, .ico-bag-black {
    background: url('../images/ico-s78b1a1919b.png') no-repeat;
  }
  
  .ico-bag-blue {
    background-position: 0 0;
    width:40px;
    height:24px;
  }
  
  .ico-bag-black {
    background-position: 0 -24px;
    width:44px;
    height:30px;
  }
  </code></pre>
  
  <p>Can anyone explain to me how I can do that?
  Thanks.</p>