mirror of
https://github.com/vector-im/element-ios.git
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50 lines
1.6 KiB
Swift
50 lines
1.6 KiB
Swift
/*
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Copyright 2020 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import Foundation
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final class QRCodeGenerator {
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// MARK: - Constants
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private enum Constants {
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static let qrCodeGeneratorFilter = "CIQRCodeGenerator"
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static let qrCodeInputCorrectionLevel = "M"
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}
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// MARK: - Public
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func generateCode(from data: Data, with size: CGSize) -> UIImage? {
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guard let filter = CIFilter(name: Constants.qrCodeGeneratorFilter) else {
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return nil
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}
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filter.setValue(data, forKey: "inputMessage")
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filter.setValue(Constants.qrCodeInputCorrectionLevel, forKey: "inputCorrectionLevel") // Be sure to use same error resilience level as other platform
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guard let ciImage = filter.outputImage else {
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return nil
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}
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let scaleX = size.width/ciImage.extent.size.width
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let scaleY = size.height/ciImage.extent.size.height
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let transform = CGAffineTransform(scaleX: scaleX, y: scaleY)
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let transformedCIImage = ciImage.transformed(by: transform)
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return UIImage(ciImage: transformedCIImage)
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}
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}
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