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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
​
</body>
</html>
 
console.clear();
​
var ratios = {
  cover: function(wRatio, hRatio) {
    return Math.max(wRatio, hRatio);
  },
​
  contain: function(wRatio, hRatio) {
    return Math.min(wRatio, hRatio);
  },
​
  // original size
  "auto": function() {
    return 1;
  },
​
  // stretch
  "100% 100%": function(wRatio, hRatio) {
    return { width:wRatio, height:hRatio };
  },
  
  // scale
  // NOTE: only works with percentages
  //       e.g. "100% 50%", "20% 10%", etc...
  scale: function() {
    var size = arguments[2];
    var sizeArr = size.split(" ").map(function(s){
      return s.replace("%", "") / 100;
    });
    return {
      isScaled: true,
      width: sizeArr[0],
      height: sizeArr[1]
    }
  }
};
​
function getImageSize(options) {
  var computeRatio = ratios[options.size] || ratios.scale;
  var ratio = computeRatio(
    options.container.width / options.image.width,
    options.container.height / options.image.height,
    options.size // used to scale
  );
  
  return {
    width: ratio.isScaled ? options.container.width * ratio.width : 
                            options.image.width * (ratio.width || ratio),
    height: ratio.isScaled ? options.container.height * ratio.height :
                             options.image.height * (ratio.height || ratio)
  };
}
​
​
// EXAMPLE ON HOW IT WORKS:
[
  "cover",
  "contain",
  "auto",
  "100% 100%",
  "20% 50%"
].forEach(function (size) {
  var imageSize = getImageSize({
    container: {width: 100, height: 100},
    image: {width: 200, height: 50},
    size: size
  });
  console.log("------ " + size.toUpperCase() + ": ------");
  console.log(imageSize);
});
​
Output

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pgarciacamoupro
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