57 lines
2.3 KiB
Mathematica
57 lines
2.3 KiB
Mathematica
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//
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// Created by Gabriel Handford on 3/1/09.
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// Copyright 2009-2013. All rights reserved.
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// Created by John Boiles on 10/20/11.
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// Copyright (c) 2011. All rights reserved
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// Modified by Felix Schulze on 2/11/13.
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// Copyright 2013. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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//
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#import "UIImage+Diff.h"
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@implementation UIImage (Diff)
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- (UIImage *)diffWithImage:(UIImage *)image
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{
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if (!image) {
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return nil;
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}
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CGSize imageSize = CGSizeMake(MAX(self.size.width, image.size.width), MAX(self.size.height, image.size.height));
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UIGraphicsBeginImageContextWithOptions(imageSize, YES, 0.0);
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CGContextRef context = UIGraphicsGetCurrentContext();
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[self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
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CGContextSetAlpha(context, 0.5f);
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CGContextBeginTransparencyLayer(context, NULL);
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[image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
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CGContextSetBlendMode(context, kCGBlendModeDifference);
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CGContextSetFillColorWithColor(context,[UIColor whiteColor].CGColor);
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CGContextFillRect(context, CGRectMake(0, 0, self.size.width, self.size.height));
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CGContextEndTransparencyLayer(context);
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UIImage *returnImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return returnImage;
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}
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@end
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