git.r.bdr.sh - rbdr/captura/blob - Captura/Core Extensions/CGImage+resize.swift

   1 import CoreGraphics
   2
   3 extension CGImage {
   4   func resize(by scale: CGFloat) -> CGImage? {
   5     let width = Int(CGFloat(self.width) / scale)
   6     let height = Int(CGFloat(self.height) / scale)
   7
   8     let bitsPerComponent = self.bitsPerComponent
   9     let colorSpace = self.colorSpace ?? CGColorSpace(name: CGColorSpace.sRGB)!
  10     let bitmapInfo = self.bitmapInfo.rawValue
  11
  12     guard let context = CGContext(data: nil, width: width, height: height, bitsPerComponent: bitsPerComponent, bytesPerRow: 0, space: colorSpace, bitmapInfo: bitmapInfo) else {
  13         return nil
  14     }
  15
  16     context.interpolationQuality = .high
  17     context.draw(self, in: CGRect(x: 0, y: 0, width: width, height: height))
  18
  19     return context.makeImage()
  20   }
  21 }