unuigbee

extension CGImage {
    var isDark: Bool {
        get {
            guard let imageData = self.dataProvider?.data else { return false }
            guard let ptr = CFDataGetBytePtr(imageData) else { return false }
            let length = CFDataGetLength(imageData)
            let threshold = Int(Double(self.width * self.height) * 0.45)
            var darkPixels = 0
            for i in stride(from: 0, to: length, by: 4) {
                let r = ptr[i]

unuigbee

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version