git.r.bdr.sh - rbdr/patterns/blob - Sources/Patterns/CGImage+resize.swift

   1 import CoreGraphics
   2
   3 extension CGImage {
   4     func resize(size:CGSize) -> CGImage? {
   5         let width: Int = Int(size.width)
   6         let height: Int = Int(size.height)
   7
   8         let bytesPerPixel = self.bitsPerPixel / self.bitsPerComponent
   9         let destBytesPerRow = width * bytesPerPixel
  10
  11         guard let colorSpace = self.colorSpace else { return nil }
  12         guard let context = CGContext(data: nil, width: width, height: height, bitsPerComponent: self.bitsPerComponent, bytesPerRow: destBytesPerRow, space: colorSpace, bitmapInfo: self.alphaInfo.rawValue) else { return nil }
  13
  14         context.interpolationQuality = .none
  15         context.draw(self, in: CGRect(x: 0, y: 0, width: width, height: height))
  16
  17         return context.makeImage()
  18     }
  19 }