|
|
@@ -0,0 +1,83 @@
|
|
|
+//
|
|
|
+// UIImage+fixOrientation.m
|
|
|
+// testCamera
|
|
|
+//
|
|
|
+// Created by Ray on 17/05/2017.
|
|
|
+// Copyright © 2017 R&J. All rights reserved.
|
|
|
+//
|
|
|
+
|
|
|
+#import "UIImage+fixOrientation.h"
|
|
|
+
|
|
|
+@implementation UIImage (fixOrientation)
|
|
|
+- (UIImage *)fixOrientation {
|
|
|
+
|
|
|
+ // No-op if the orientation is already correct
|
|
|
+ if (self.imageOrientation == UIImageOrientationUp) 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.
|
|
|
+ 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;
|
|
|
+ }
|
|
|
+
|
|
|
+ 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;
|
|
|
+ }
|
|
|
+
|
|
|
+ // 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;
|
|
|
+}
|
|
|
+@end
|
