NSView Snapshot

snapshot.swift

extension NSView {
  var snapshot: NSImage {
    guard let bitmapRep = bitmapImageRepForCachingDisplayInRect(bounds) else { return NSImage() }
    bitmapRep.size = bounds.size
    cacheDisplayInRect(bounds, toBitmapImageRep: bitmapRep)
    let image = NSImage(size: bounds.size)
    image.addRepresentation(bitmapRep)
    return image
  }
}

Not sure how to get a retina-scale (@2x) snapshot here. Tried messing with the different sizes but nothing worked...

Figured it out. You need to change the bitmap representation properties (size in this instance) after setting it as a represenation of our target image. Props to @robrix for pointing me in the right direction!

extension NSView {
  var snapshot: NSImage {
    guard let bitmapRep = bitmapImageRepForCachingDisplayInRect(bounds) else { return NSImage() }
    cacheDisplayInRect(bounds, toBitmapImageRep: bitmapRep)
    let image = NSImage()
    image.addRepresentation(bitmapRep)
    bitmapRep.size = bounds.size.doubleScale()
    return image
  }
}

extension CGSize {
  func doubleScale() -> CGSize {
    return CGSize(width: width * 2, height: height * 2)
  }
}

How to cache NSView filtered content?