INNER CODE UNIT · Swift

handleAPNG

duguyihou/react-native-turbo-image · ios/TurboImageView.swift:291

  func handleAPNG() {
    struct Static {
      static var didRegister = false
    }
    if !Static.didRegister {
      ImageDecoderRegistry.shared.register { context in
        // Signature bytes for the acTL chunk in an APNG file
        let acTLSignature = Data([0x61, 0x63, 0x54, 0x4C])
        // Search for the acTL chunk signature in the data
        if let _ = context.data.range(of: acTLSignature) {
          return ImageDecoders.Empty()
        } else {
          return nil
        }
      }
      Static.didRegister = true
    }
    

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