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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| // WBImage.h -- extra UIImage methods | ||
| // by allen brunson march 29 2009 | ||
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| #ifndef WBIMAGE_H | ||
| #define WBIMAGE_H | ||
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| #import <UIKit/UIKit.h> | ||
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| @interface UIImage (WBImage) | ||
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| // rotate UIImage to any angle | ||
| -(UIImage*)rotate:(UIImageOrientation)orient; | ||
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| // rotate and scale image from iphone camera | ||
| -(UIImage*)rotateAndScaleFromCameraWithMaxSize:(CGFloat)maxSize; | ||
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| // scale this image to a given maximum width and height | ||
| -(UIImage*)scaleWithMaxSize:(CGFloat)maxSize; | ||
| -(UIImage*)scaleWithMaxSize:(CGFloat)maxSize | ||
| quality:(CGInterpolationQuality)quality; | ||
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| @end | ||
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| #endif // WBIMAGE_H |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,179 @@ | ||
| // WBImage.mm -- extra UIImage methods | ||
| // by allen brunson march 29 2009 | ||
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| #include "WBImage.h" | ||
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| static inline CGFloat degreesToRadians(CGFloat degrees) | ||
| { | ||
| return M_PI * (degrees / 180.0); | ||
| } | ||
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| static inline CGSize swapWidthAndHeight(CGSize size) | ||
| { | ||
| CGFloat swap = size.width; | ||
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| size.width = size.height; | ||
| size.height = swap; | ||
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| return size; | ||
| } | ||
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| @implementation UIImage (WBImage) | ||
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| // rotate an image to any 90-degree orientation, with or without mirroring. | ||
| // original code by kevin lohman, heavily modified by yours truly. | ||
| // http://blog.logichigh.com/2008/06/05/uiimage-fix/ | ||
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| -(UIImage*)rotate:(UIImageOrientation)orient | ||
| { | ||
| CGRect bnds = CGRectZero; | ||
| UIImage* copy = nil; | ||
| CGContextRef ctxt = nil; | ||
| CGRect rect = CGRectZero; | ||
| CGAffineTransform tran = CGAffineTransformIdentity; | ||
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| bnds.size = self.size; | ||
| rect.size = self.size; | ||
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| switch (orient) | ||
| { | ||
| case UIImageOrientationUp: | ||
| return self; | ||
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| case UIImageOrientationUpMirrored: | ||
| tran = CGAffineTransformMakeTranslation(rect.size.width, 0.0); | ||
| tran = CGAffineTransformScale(tran, -1.0, 1.0); | ||
| break; | ||
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| case UIImageOrientationDown: | ||
| tran = CGAffineTransformMakeTranslation(rect.size.width, | ||
| rect.size.height); | ||
| tran = CGAffineTransformRotate(tran, degreesToRadians(180.0)); | ||
| break; | ||
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| case UIImageOrientationDownMirrored: | ||
| tran = CGAffineTransformMakeTranslation(0.0, rect.size.height); | ||
| tran = CGAffineTransformScale(tran, 1.0, -1.0); | ||
| break; | ||
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| case UIImageOrientationLeft: | ||
| bnds.size = swapWidthAndHeight(bnds.size); | ||
| tran = CGAffineTransformMakeTranslation(0.0, rect.size.width); | ||
| tran = CGAffineTransformRotate(tran, degreesToRadians(-90.0)); | ||
| break; | ||
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| case UIImageOrientationLeftMirrored: | ||
| bnds.size = swapWidthAndHeight(bnds.size); | ||
| tran = CGAffineTransformMakeTranslation(rect.size.height, | ||
| rect.size.width); | ||
| tran = CGAffineTransformScale(tran, -1.0, 1.0); | ||
| tran = CGAffineTransformRotate(tran, degreesToRadians(-90.0)); | ||
| break; | ||
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| case UIImageOrientationRight: | ||
| bnds.size = swapWidthAndHeight(bnds.size); | ||
| tran = CGAffineTransformMakeTranslation(rect.size.height, 0.0); | ||
| tran = CGAffineTransformRotate(tran, degreesToRadians(90.0)); | ||
| break; | ||
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| case UIImageOrientationRightMirrored: | ||
| bnds.size = swapWidthAndHeight(bnds.size); | ||
| tran = CGAffineTransformMakeScale(-1.0, 1.0); | ||
| tran = CGAffineTransformRotate(tran, degreesToRadians(90.0)); | ||
| break; | ||
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| default: | ||
| // orientation value supplied is invalid | ||
| assert(false); | ||
| return nil; | ||
| } | ||
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| UIGraphicsBeginImageContext(bnds.size); | ||
| ctxt = UIGraphicsGetCurrentContext(); | ||
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| switch (orient) | ||
| { | ||
| case UIImageOrientationLeft: | ||
| case UIImageOrientationLeftMirrored: | ||
| case UIImageOrientationRight: | ||
| case UIImageOrientationRightMirrored: | ||
| CGContextScaleCTM(ctxt, -1.0, 1.0); | ||
| CGContextTranslateCTM(ctxt, -rect.size.height, 0.0); | ||
| break; | ||
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| default: | ||
| CGContextScaleCTM(ctxt, 1.0, -1.0); | ||
| CGContextTranslateCTM(ctxt, 0.0, -rect.size.height); | ||
| break; | ||
| } | ||
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| CGContextConcatCTM(ctxt, tran); | ||
| CGContextDrawImage(ctxt, rect, self.CGImage); | ||
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| copy = UIGraphicsGetImageFromCurrentImageContext(); | ||
| UIGraphicsEndImageContext(); | ||
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| return copy; | ||
| } | ||
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| -(UIImage*)rotateAndScaleFromCameraWithMaxSize:(CGFloat)maxSize | ||
| { | ||
| UIImage* imag = self; | ||
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| imag = [imag rotate:imag.imageOrientation]; | ||
| imag = [imag scaleWithMaxSize:maxSize]; | ||
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| return imag; | ||
| } | ||
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| -(UIImage*)scaleWithMaxSize:(CGFloat)maxSize | ||
| { | ||
| return [self scaleWithMaxSize:maxSize quality:kCGInterpolationHigh]; | ||
| } | ||
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| -(UIImage*)scaleWithMaxSize:(CGFloat)maxSize | ||
| quality:(CGInterpolationQuality)quality | ||
| { | ||
| CGRect bnds = CGRectZero; | ||
| UIImage* copy = nil; | ||
| CGContextRef ctxt = nil; | ||
| CGRect orig = CGRectZero; | ||
| CGFloat rtio = 0.0; | ||
| CGFloat scal = 1.0; | ||
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| bnds.size = self.size; | ||
| orig.size = self.size; | ||
| rtio = orig.size.width / orig.size.height; | ||
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| if ((orig.size.width <= maxSize) && (orig.size.height <= maxSize)) | ||
| { | ||
| return self; | ||
| } | ||
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| if (rtio > 1.0) | ||
| { | ||
| bnds.size.width = maxSize; | ||
| bnds.size.height = maxSize / rtio; | ||
| } | ||
| else | ||
| { | ||
| bnds.size.width = maxSize * rtio; | ||
| bnds.size.height = maxSize; | ||
| } | ||
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| UIGraphicsBeginImageContext(bnds.size); | ||
| ctxt = UIGraphicsGetCurrentContext(); | ||
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| scal = bnds.size.width / orig.size.width; | ||
| CGContextSetInterpolationQuality(ctxt, quality); | ||
| CGContextScaleCTM(ctxt, scal, -scal); | ||
| CGContextTranslateCTM(ctxt, 0.0, -orig.size.height); | ||
| CGContextDrawImage(ctxt, orig, self.CGImage); | ||
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| copy = UIGraphicsGetImageFromCurrentImageContext(); | ||
| UIGraphicsEndImageContext(); | ||
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| return copy; | ||
| } | ||
|
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| @end |
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