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Summary: title Kevin's comment on D14434796 Reviewed By: shergin Differential Revision: D14476210 fbshipit-source-id: 6c0ffcaef8364551f58d00e7f0c887962bd3b5a4
34 lines
1.2 KiB
Objective-C
34 lines
1.2 KiB
Objective-C
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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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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