Created
May 24, 2016 07:40
-
-
Save quangtqag/d2c64a2d3faf8f4550b6e20a47e561ef to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| func fixOrientation() -> UIImage { | |
| // No-op if the orientation is already correct | |
| if ( self.imageOrientation == UIImageOrientation.Up ) { | |
| return self; | |
| } | |
| // We need to calculate the proper transformation to make the image upright. | |
| // We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored. | |
| var transform: CGAffineTransform = CGAffineTransformIdentity | |
| if ( self.imageOrientation == UIImageOrientation.Down || self.imageOrientation == UIImageOrientation.DownMirrored ) { | |
| transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height) | |
| transform = CGAffineTransformRotate(transform, CGFloat(M_PI)) | |
| } | |
| if ( self.imageOrientation == UIImageOrientation.Left || self.imageOrientation == UIImageOrientation.LeftMirrored ) { | |
| transform = CGAffineTransformTranslate(transform, self.size.width, 0) | |
| transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2)) | |
| } | |
| if ( self.imageOrientation == UIImageOrientation.Right || self.imageOrientation == UIImageOrientation.RightMirrored ) { | |
| transform = CGAffineTransformTranslate(transform, 0, self.size.height); | |
| transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2)); | |
| } | |
| if ( self.imageOrientation == UIImageOrientation.UpMirrored || self.imageOrientation == UIImageOrientation.DownMirrored ) { | |
| transform = CGAffineTransformTranslate(transform, self.size.width, 0) | |
| transform = CGAffineTransformScale(transform, -1, 1) | |
| } | |
| if ( self.imageOrientation == UIImageOrientation.LeftMirrored || self.imageOrientation == UIImageOrientation.RightMirrored ) { | |
| transform = CGAffineTransformTranslate(transform, self.size.height, 0); | |
| transform = CGAffineTransformScale(transform, -1, 1); | |
| } | |
| // Now we draw the underlying CGImage into a new context, applying the transform | |
| // calculated above. | |
| let ctx: CGContextRef = CGBitmapContextCreate(nil, Int(self.size.width), Int(self.size.height), | |
| CGImageGetBitsPerComponent(self.CGImage), 0, | |
| CGImageGetColorSpace(self.CGImage), | |
| CGImageGetBitmapInfo(self.CGImage).rawValue)!; | |
| CGContextConcatCTM(ctx, transform) | |
| if ( self.imageOrientation == UIImageOrientation.Left || | |
| self.imageOrientation == UIImageOrientation.LeftMirrored || | |
| self.imageOrientation == UIImageOrientation.Right || | |
| self.imageOrientation == UIImageOrientation.RightMirrored ) { | |
| CGContextDrawImage(ctx, CGRectMake(0,0,self.size.height,self.size.width), self.CGImage) | |
| } else { | |
| CGContextDrawImage(ctx, CGRectMake(0,0,self.size.width,self.size.height), self.CGImage) | |
| } | |
| // And now we just create a new UIImage from the drawing context and return it | |
| return UIImage(CGImage: CGBitmapContextCreateImage(ctx)!) | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment