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Cross platform shapes images using CGImage. Elegantly created using swift and swifty conventions. See more at
// CGImage+Shapes.swift
// MazKit
// Created by Mazyad Alabduljaleel on 3/22/15.
// Copyright (c) 2015 ArabianDevs. All rights reserved.
import CoreGraphics
public extension CGImage {
public enum Shape {
case Circle(radius: CGFloat)
case Rect(width: CGFloat, height: CGFloat)
public var size: CGSize {
switch self {
case .Circle(let radius):
return CGSize(width: radius, height: radius)
case .Rect(let width, let height):
return CGSize(width: width, height: height)
public var rect: CGRect {
return CGRect(origin: CGPoint.zeroPoint, size: size)
public var path: CGPathRef {
var bezier: UIBezierPath
switch self {
case .Circle(let radius):
bezier = UIBezierPath(ovalInRect: rect)
case .Rect(let width, let height):
bezier = UIBezierPath(rect: rect)
return bezier.CGPath
public class func render(shape: Shape, color: CGColorRef) -> CGImage {
let width = UInt(ceil(shape.size.width))
let height = UInt(ceil(shape.size.height))
let bitsPerComponent = 8 as UInt
let componentsCount = 4 as UInt
let bytesPerPixel = (bitsPerComponent * componentsCount) / 8
let totalBytes = bytesPerPixel * width * height
let bytesPerRow = UInt(bytesPerPixel) * width
let buffer: UnsafeMutablePointer<Void> = UnsafeMutablePointer.alloc(Int(totalBytes))
memset(buffer, 0, totalBytes)
let colorspace = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGBitmapInfo(CGBitmapInfo.ByteOrder32Big.rawValue + CGImageAlphaInfo.PremultipliedLast.rawValue)
let context = CGBitmapContextCreate(buffer, width, height, bitsPerComponent, bytesPerRow, colorspace, bitmapInfo)
CGContextSetFillColorWithColor(context, color)
CGContextAddPath(context, shape.path)
return CGBitmapContextCreateImage(context)
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