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(iOS) Image masking Objective-C / Swift
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| //http://www.innofied.com/implementing-image-masking-in-ios/ | |
| - (UIImage*) maskImage:(UIImage *) image withMask:(UIImage *) mask | |
| { | |
| CGImageRef imageReference = image.CGImage; | |
| CGImageRef maskReference = mask.CGImage; | |
| CGImageRef imageMask = CGImageMaskCreate(CGImageGetWidth(maskReference), | |
| CGImageGetHeight(maskReference), | |
| CGImageGetBitsPerComponent(maskReference), | |
| CGImageGetBitsPerPixel(maskReference), | |
| CGImageGetBytesPerRow(maskReference), | |
| CGImageGetDataProvider(maskReference), | |
| NULL, // Decode is null | |
| YES // Should interpolate | |
| ); | |
| CGImageRef maskedReference = CGImageCreateWithMask(imageReference, imageMask); | |
| CGImageRelease(imageMask); | |
| UIImage *maskedImage = [UIImage imageWithCGImage:maskedReference]; | |
| CGImageRelease(maskedReference); | |
| return maskedImage; | |
| } | |
| //USE | |
| UIImage *image=[UIImage imageNamed:@"image2.png"]; | |
| UIImage *mask=[UIImage imageNamed:@"mask6.png"]; | |
| UIImage *newimage=[self maskImage:image withMask:mask]; | |
| self.imageView.image=newimage; |
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| Swift | |
| func maskImage(image:UIImage, mask:(UIImage))->UIImage{ | |
| let imageReference = image.CGImage | |
| let maskReference = mask.CGImage | |
| let imageMask = CGImageMaskCreate(CGImageGetWidth(maskReference), | |
| CGImageGetHeight(maskReference), | |
| CGImageGetBitsPerComponent(maskReference), | |
| CGImageGetBitsPerPixel(maskReference), | |
| CGImageGetBytesPerRow(maskReference), | |
| CGImageGetDataProvider(maskReference), nil, true) | |
| let maskedReference = CGImageCreateWithMask(imageReference, imageMask) | |
| let maskedImage = UIImage(CGImage:maskedReference!) | |
| return maskedImage | |
| } | |
| //USE | |
| let image = UIImage(named: "image2.png") | |
| let maskingImage = UIImage(named: "mask6.png") | |
| imageView.image = maskImage(image!, mask: maskingImage!) |
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