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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,22 @@ | ||
| // | ||
| // UIImage+G8FixOrientation.h | ||
| // Tesseract OCR iOS | ||
| // | ||
| // Thanks to `binnyb` for answer from | ||
| // http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload | ||
| // | ||
| // Created by Nikolay Volosatov on 09/01/15. | ||
| // Copyright (c) 2014 Daniele Galiotto - www.g8production.com. | ||
| // All rights reserved. | ||
| // | ||
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| #import <UIKit/UIKit.h> | ||
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| @interface UIImage (G8FixOrientation) | ||
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| - (CGAffineTransform)transformForOrientationFix; | ||
| - (CGSize)sizeForOrientationFix; | ||
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| - (UIImage *)fixOrientation; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // | ||
| // UIImage+G8FixOrientation.m | ||
| // Tesseract OCR iOS | ||
| // | ||
| // Thanks to `binnyb` for answer from | ||
| // http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload | ||
| // | ||
| // Created by Nikolay Volosatov on 09/01/15. | ||
| // Copyright (c) 2014 Daniele Galiotto - www.g8production.com. | ||
| // All rights reserved. | ||
| // | ||
|
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| #import "UIImage+G8FixOrientation.h" | ||
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| @implementation UIImage (G8FixOrientation) | ||
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| - (CGAffineTransform)transformForOrientationFix | ||
| { | ||
| // 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; | ||
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| switch (self.imageOrientation) | ||
| { | ||
| case UIImageOrientationDown: | ||
| case UIImageOrientationDownMirrored: | ||
| transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height); | ||
| transform = CGAffineTransformRotate(transform, M_PI); | ||
| break; | ||
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| case UIImageOrientationLeft: | ||
| case UIImageOrientationLeftMirrored: | ||
| transform = CGAffineTransformTranslate(transform, self.size.width, 0); | ||
| transform = CGAffineTransformRotate(transform, M_PI_2); | ||
| break; | ||
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| case UIImageOrientationRight: | ||
| case UIImageOrientationRightMirrored: | ||
| transform = CGAffineTransformTranslate(transform, 0, self.size.height); | ||
| transform = CGAffineTransformRotate(transform, -M_PI_2); | ||
| break; | ||
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| case UIImageOrientationUp: | ||
| case UIImageOrientationUpMirrored: | ||
| break; | ||
| } | ||
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| switch (self.imageOrientation) { | ||
| case UIImageOrientationUpMirrored: | ||
| case UIImageOrientationDownMirrored: | ||
| transform = CGAffineTransformTranslate(transform, self.size.width, 0); | ||
| transform = CGAffineTransformScale(transform, -1, 1); | ||
| break; | ||
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| case UIImageOrientationLeftMirrored: | ||
| case UIImageOrientationRightMirrored: | ||
| transform = CGAffineTransformTranslate(transform, self.size.height, 0); | ||
| transform = CGAffineTransformScale(transform, -1, 1); | ||
| break; | ||
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| case UIImageOrientationUp: | ||
| case UIImageOrientationDown: | ||
| case UIImageOrientationLeft: | ||
| case UIImageOrientationRight: | ||
| break; | ||
| } | ||
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| return transform; | ||
| } | ||
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| - (CGSize)sizeForOrientationFix | ||
| { | ||
| switch (self.imageOrientation) { | ||
| case UIImageOrientationLeft: | ||
| case UIImageOrientationLeftMirrored: | ||
| case UIImageOrientationRight: | ||
| case UIImageOrientationRightMirrored: | ||
| return CGSizeMake(self.size.height, self.size.width); | ||
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| default: | ||
| return self.size; | ||
| } | ||
| } | ||
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| - (UIImage *)fixOrientation | ||
| { | ||
| // No-op if the orientation is already correct | ||
| if (self.imageOrientation == UIImageOrientationUp) return self; | ||
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| CGAffineTransform transform = [self transformForOrientationFix]; | ||
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| // Now we draw the underlying CGImage into a new context, applying the transform | ||
| // calculated above. | ||
| CGImageRef cgImage = self.CGImage; | ||
| CGSize size = [self sizeForOrientationFix]; | ||
| CGContextRef ctx = CGBitmapContextCreate(NULL, size.width, size.height, | ||
| CGImageGetBitsPerComponent(cgImage), 0, | ||
| CGImageGetColorSpace(cgImage), | ||
| CGImageGetBitmapInfo(cgImage)); | ||
| CGContextConcatCTM(ctx, transform); | ||
| CGContextDrawImage(ctx, (CGRect){CGPointZero, size}, cgImage); | ||
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| // 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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| @end |
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