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+//
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+// UIColor+fixedOrientation.swift
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+// Nextcloud
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+//
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+// Created by Marino Faggiana on 27/11/2019.
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+// Copyright © 2019 Marino Faggiana. All rights reserved.
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+//
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+// Author Marino Faggiana <marino.faggiana@nextcloud.com>
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+//
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+// This program is free software: you can redistribute it and/or modify
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+// it under the terms of the GNU General Public License as published by
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+// the Free Software Foundation, either version 3 of the License, or
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+// (at your option) any later version.
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+//
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+// This program is distributed in the hope that it will be useful,
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+// but WITHOUT ANY WARRANTY; without even the implied warranty of
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+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+// GNU General Public License for more details.
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+//
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+// You should have received a copy of the GNU General Public License
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+// along with this program. If not, see <http://www.gnu.org/licenses/>.
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+//
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+
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+import Foundation
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+
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+extension UIImage {
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+
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+ /// Fix image orientaton to protrait up
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+ func fixedOrientation() -> UIImage? {
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+ guard imageOrientation != UIImage.Orientation.up else {
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+ // This is default orientation, don't need to do anything
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+ return self.copy() as? UIImage
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+ }
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+
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+ guard let cgImage = self.cgImage else {
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+ // CGImage is not available
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+ return nil
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+ }
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+
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+ guard let colorSpace = cgImage.colorSpace, let ctx = CGContext(data: nil, width: Int(size.width), height: Int(size.height), bitsPerComponent: cgImage.bitsPerComponent, bytesPerRow: 0, space: colorSpace, bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue) else {
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+ return nil // Not able to create CGContext
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+ }
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+
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+ var transform: CGAffineTransform = CGAffineTransform.identity
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+
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+ switch imageOrientation {
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+ case .down, .downMirrored:
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+ transform = transform.translatedBy(x: size.width, y: size.height)
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+ transform = transform.rotated(by: CGFloat.pi)
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+ case .left, .leftMirrored:
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+ transform = transform.translatedBy(x: size.width, y: 0)
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+ transform = transform.rotated(by: CGFloat.pi / 2.0)
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+ case .right, .rightMirrored:
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+ transform = transform.translatedBy(x: 0, y: size.height)
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+ transform = transform.rotated(by: CGFloat.pi / -2.0)
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+ case .up, .upMirrored:
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+ break
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+ @unknown default:
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+ break
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+ }
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+
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+ // Flip image one more time if needed to, this is to prevent flipped image
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+ switch imageOrientation {
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+ case .upMirrored, .downMirrored:
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+ transform = transform.translatedBy(x: size.width, y: 0)
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+ transform = transform.scaledBy(x: -1, y: 1)
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+ case .leftMirrored, .rightMirrored:
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+ transform = transform.translatedBy(x: size.height, y: 0)
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+ transform = transform.scaledBy(x: -1, y: 1)
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+ case .up, .down, .left, .right:
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+ break
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+ @unknown default:
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+ break
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+ }
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+
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+ ctx.concatenate(transform)
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+
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+ switch imageOrientation {
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+ case .left, .leftMirrored, .right, .rightMirrored:
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+ ctx.draw(cgImage, in: CGRect(x: 0, y: 0, width: size.height, height: size.width))
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+ default:
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+ ctx.draw(cgImage, in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
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+ break
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+ }
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+
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+ guard let newCGImage = ctx.makeImage() else { return nil }
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+ return UIImage.init(cgImage: newCGImage, scale: 1, orientation: .up)
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+ }
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+}
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marinofaggiana