iOS 이미지 처리 함수

먼저 리사이징 함수..  

-(UIImage *)resizeImage:(UIImage *)image width:(float)resizeWidth height:(float)resizeHeight{

UIGraphicsBeginImageContext(CGSizeMake(resizeWidth, resizeHeight));

CGContextRef context = UIGraphicsGetCurrentContext();

CGContextTranslateCTM(context, 0.0, resizeHeight);

CGContextScaleCTM(context, 1.0, -1.0);

CGContextDrawImage(context, CGRectMake(0.0, 0.0, resizeWidth, resizeHeight), [image CGImage]);

UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return scaledImage;

}

크롭용 함수입니다. 파라메터로 이미지와 크로핑하고 싶은 영역

- (UIImage*)imageByCropping:(UIImage *)imageToCrop toRect:(CGRect)rect

{

UIGraphicsBeginImageContext(rect.size);

CGContextRef currentContext = UIGraphicsGetCurrentContext();

CGContextTranslateCTM(currentContext, 0.0, rect.size.height);

CGContextScaleCTM(currentContext, 1.0, -1.0);

CGRect clippedRect = CGRectMake(0, 0, rect.size.width, rect.size.height);

CGContextClipToRect( currentContext, clippedRect);

CGRect drawRect = CGRectMake(rect.origin.x * -1,rect.origin.y * -1,imageToCrop.size.width,imageToCrop.size.height);

CGContextDrawImage(currentContext, drawRect, imageToCrop.CGImage);

CGContextScaleCTM(currentContext, 1.0, -1.0);

UIImage *cropped = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return cropped;

}

마스킹함수 첫번째 파라메터로 마스킹할 대상 이미지 파일 두번째 이미지 파일에는 마스킹용의 이미지

-(UIImage *)maskingImage:(UIImage *)image maskImage:(NSString)_maskImage{

CGImageRef imageRef = [image CGImage];

CGImageRef maskRef = [[UIImage imageNamed:_maskImage] CGImage];

    

CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef),

CGImageGetHeight(maskRef),

CGImageGetBitsPerComponent(maskRef),

CGImageGetBitsPerPixel(maskRef),

CGImageGetBytesPerRow(maskRef),

CGImageGetDataProvider(maskRef),

NULL, false);

    

CGImageRef masked = CGImageCreateWithMask(imageRef, mask);

CGImageRelease(mask);

    

UIImage *maskedImage = [UIImage imageWithCGImage:masked];

CGImageRelease(masked);

return maskedImage;

}