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| - (UIImage *)fixRotation | |
| { | |
| if (self.imageOrientation == UIImageOrientationUp) return self; | |
| CGAffineTransform transform = CGAffineTransformIdentity; | |
| switch (self.imageOrientation) { | |
| case UIImageOrientationDown: | |
| case UIImageOrientationDownMirrored: | |
| transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height); | |
| transform = CGAffineTransformRotate(transform, M_PI); | |
| break; | |
| case UIImageOrientationLeft: | |
| case UIImageOrientationLeftMirrored: | |
| transform = CGAffineTransformTranslate(transform, self.size.width, 0); | |
| transform = CGAffineTransformRotate(transform, M_PI_2); | |
| break; | |
| case UIImageOrientationRight: | |
| case UIImageOrientationRightMirrored: | |
| transform = CGAffineTransformTranslate(transform, 0, self.size.height); | |
| transform = CGAffineTransformRotate(transform, -M_PI_2); | |
| break; | |
| case UIImageOrientationUp: | |
| case UIImageOrientationUpMirrored: | |
| break; | |
| } | |
| switch (self.imageOrientation) { | |
| case UIImageOrientationUpMirrored: | |
| case UIImageOrientationDownMirrored: | |
| transform = CGAffineTransformTranslate(transform, self.size.width, 0); | |
| transform = CGAffineTransformScale(transform, -1, 1); | |
| break; | |
| case UIImageOrientationLeftMirrored: | |
| case UIImageOrientationRightMirrored: | |
| transform = CGAffineTransformTranslate(transform, self.size.height, 0); | |
| transform = CGAffineTransformScale(transform, -1, 1); | |
| break; | |
| case UIImageOrientationUp: | |
| case UIImageOrientationDown: | |
| case UIImageOrientationLeft: | |
| case UIImageOrientationRight: | |
| break; | |
| } | |
| // Now we draw the underlying CGImage into a new context, applying the transform | |
| // calculated above. | |
| CGContextRef ctx = CGBitmapContextCreate(NULL, self.size.width, self.size.height, | |
| CGImageGetBitsPerComponent(self.CGImage), 0, | |
| CGImageGetColorSpace(self.CGImage), | |
| CGImageGetBitmapInfo(self.CGImage)); | |
| CGContextConcatCTM(ctx, transform); | |
| switch (self.imageOrientation) { | |
| case UIImageOrientationLeft: | |
| case UIImageOrientationLeftMirrored: | |
| case UIImageOrientationRight: | |
| case UIImageOrientationRightMirrored: | |
| // Grr... | |
| CGContextDrawImage(ctx, CGRectMake(0,0,self.size.height,self.size.width), self.CGImage); | |
| break; | |
| default: | |
| CGContextDrawImage(ctx, CGRectMake(0,0,self.size.width,self.size.height), self.CGImage); | |
| break; | |
| } | |
| // And now we just create a new UIImage from the drawing context | |
| CGImageRef cgimg = CGBitmapContextCreateImage(ctx); | |
| UIImage *img = [UIImage imageWithCGImage:cgimg]; | |
| CGContextRelease(ctx); | |
| CGImageRelease(cgimg); | |
| return img; | |
| } |
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| extension UIImage { | |
| public func fixOrientation() -> UIImage? { | |
| if imageOrientation == .Up { | |
| return self | |
| } | |
| var transform = CGAffineTransformIdentity | |
| switch (imageOrientation) { | |
| case .Down: | |
| fallthrough | |
| case .DownMirrored: | |
| transform = CGAffineTransformTranslate(transform, size.width, size.height) | |
| transform = CGAffineTransformRotate(transform, CGFloat(M_PI)) | |
| case .Left: | |
| fallthrough | |
| case .LeftMirrored: | |
| transform = CGAffineTransformTranslate(transform, size.width, 0.0) | |
| transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2)) | |
| case .Right: | |
| fallthrough | |
| case .RightMirrored: | |
| transform = CGAffineTransformTranslate(transform, 0.0, size.height) | |
| transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2)) | |
| default: | |
| break | |
| } | |
| switch (imageOrientation) { | |
| case .UpMirrored: | |
| fallthrough | |
| case .DownMirrored: | |
| transform = CGAffineTransformTranslate(transform, size.width, 0.0) | |
| transform = CGAffineTransformScale(transform, -1.0, 1.0) | |
| case .LeftMirrored: | |
| fallthrough | |
| case .RightMirrored: | |
| transform = CGAffineTransformTranslate(transform, size.height, 0.0) | |
| transform = CGAffineTransformScale(transform, -1.0, 1.0) | |
| default: | |
| break | |
| } | |
| // Now we draw the underlying CGImage into a new context, applying the transform | |
| // calculated above. | |
| let ctx = CGBitmapContextCreate(nil, UInt(size.width), UInt(size.height), | |
| CGImageGetBitsPerComponent(CGImage), 0, | |
| CGImageGetColorSpace(CGImage), | |
| CGImageGetBitmapInfo(CGImage)) | |
| CGContextConcatCTM(ctx, transform) | |
| switch imageOrientation { | |
| case .Left: | |
| fallthrough | |
| case .LeftMirrored: | |
| fallthrough | |
| case .Right: | |
| fallthrough | |
| case .RightMirrored: | |
| // Grr... | |
| CGContextDrawImage(ctx, CGRect(origin: CGPointZero, size: CGSize(width: size.height, height: size.width)), CGImage) | |
| default: | |
| CGContextDrawImage(ctx, CGRect(origin: CGPointZero, size: size), CGImage) | |
| } | |
| // And now we just create a new UIImage from the drawing context | |
| let cgimg = CGBitmapContextCreateImage(ctx); | |
| return UIImage(CGImage: cgimg) | |
| } | |
| } |
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