git ssb

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module.exports = function (path, opts, cb) {
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  var image = document.createElement('img')
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  image.onload = next
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  image.src = `file://${path}`
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  image.style.display = 'block'
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  if (image.complete) next()
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  function next () {
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    var imageHeight = image.height
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    var imageWidth = image.width
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    var multiplier = (opts.height / image.height)
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    if (multiplier * imageWidth < opts.width) {
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      multiplier = opts.width / image.width
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    }
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    var finalWidth = imageWidth * multiplier
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    var finalHeight = imageHeight * multiplier
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    var offsetX = (finalWidth - opts.width) / 2
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    var offsetY = (finalHeight - opts.height) / 2
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    var canvas = document.createElement('canvas')
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    canvas.width = opts.width
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    canvas.height = opts.height
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    var ctx = canvas.getContext('2d')
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    ctx.drawImage(image, -offsetX, -offsetY, finalWidth, finalHeight)
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    var dataURL = canvas.toDataURL('image/' + opts.type, 0.85)
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    cb(null, dataURL)
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  }
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}
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