Iphone: Round Image Corner

Class .h

#import

///////////////////////////////////////////////////////////////////////////////////////////////////

/// That class is used to make rounded corner of images.

@interface ImageManipulator : NSObject 

{

}

+(UIImage *)makeRoundCornerImage:(UIImage*)img :(double) cornerWidth :(double) cornerHeight;

@end

Class .m

#import "ImageManipulator.h"

@implementation ImageManipulator

static void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth, float ovalHeight)

{

    float fw, fh;

    if (ovalWidth == 0 || ovalHeight == 0) {

        CGContextAddRect(context, rect);

        return;

    }

    CGContextSaveGState(context);

    CGContextTranslateCTM (context, CGRectGetMinX(rect), CGRectGetMinY(rect));

    CGContextScaleCTM (context, ovalWidth, ovalHeight);

    fw = CGRectGetWidth (rect) / ovalWidth;

    fh = CGRectGetHeight (rect) / ovalHeight;

    CGContextMoveToPoint(context, fw, fh/2);

    CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);

    CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1);

    CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1);

    CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1);

    CGContextClosePath(context);

    CGContextRestoreGState(context);

}

+(UIImage *)makeRoundCornerImage : (UIImage*) img : (double) cornerWidth : (double) cornerHeight

{

    int w = img.size.width;

    int h = img.size.height;

// int cornerWidth=10;

// int cornerHeight=10;

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);

    CGContextBeginPath(context);

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

    addRoundedRectToPath(context, rect, cornerWidth, cornerHeight);

    CGContextClosePath(context);

    CGContextClip(context);

    CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);

    CGImageRef imageMasked = CGBitmapContextCreateImage(context);

    CGContextRelease(context);

    CGColorSpaceRelease(colorSpace);

    [img release];

    return [UIImage imageWithCGImage:imageMasked];

}

@end

Use Following Statement to call/ apply on image.

image=[ImageManipulator makeRoundCornerImage:image:20 :20];