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// UIImage+RoundedCorner.m // Created by Trevor Harmon on 9/20/09. // Free for personal or commercial use, with or without modification. // No warranty is expressed or implied. #import "UIImage+RoundedCorner.h" #import "UIImage+Alpha.h" // Private helper methods @interface UIImage () - (void)addRoundedRectToPath:(CGRect)rect context:(CGContextRef)context ovalWidth:(CGFloat)ovalWidth ovalHeight:(CGFloat)ovalHeight; @end @implementation UIImage (RoundedCorner) // Creates a copy of this image with rounded corners // If borderSize is non-zero, a transparent border of the given size will also be added // Original author: Björn Sållarp. Used with permission. See: http://blog.sallarp.com/iphone-uiimage-round-corners/ - (UIImage *)roundedCornerImage:(NSInteger)cornerSize borderSize:(NSInteger)borderSize { // If the image does not have an alpha layer, add one UIImage *image = [self imageWithAlpha]; // Build a context that's the same dimensions as the new size CGContextRef context = CGBitmapContextCreate(NULL, image.size.width, image.size.height, CGImageGetBitsPerComponent(image.CGImage), 0, CGImageGetColorSpace(image.CGImage), CGImageGetBitmapInfo(image.CGImage)); // Create a clipping path with rounded corners CGContextBeginPath(context); [self addRoundedRectToPath:CGRectMake(borderSize, borderSize, image.size.width - borderSize * 2, image.size.height - borderSize * 2) context:context ovalWidth:cornerSize ovalHeight:cornerSize]; CGContextClosePath(context); CGContextClip(context); // Draw the image to the context; the clipping path will make anything outside the rounded rect transparent CGContextDrawImage(context, CGRectMake(0, 0, image.size.width, image.size.height), image.CGImage); // Create a CGImage from the context CGImageRef clippedImage = CGBitmapContextCreateImage(context); CGContextRelease(context); // Create a UIImage from the CGImage UIImage *roundedImage = [UIImage imageWithCGImage:clippedImage]; CGImageRelease(clippedImage); return roundedImage; } #pragma mark - #pragma mark Private helper methods // Adds a rectangular path to the given context and rounds its corners by the given extents // Original author: Björn Sållarp. Used with permission. See: http://blog.sallarp.com/iphone-uiimage-round-corners/ - (void)addRoundedRectToPath:(CGRect)rect context:(CGContextRef)context ovalWidth:(CGFloat)ovalWidth ovalHeight:(CGFloat)ovalHeight { if (ovalWidth == 0 || ovalHeight == 0) { CGContextAddRect(context, rect); return; } CGContextSaveGState(context); CGContextTranslateCTM(context, CGRectGetMinX(rect), CGRectGetMinY(rect)); CGContextScaleCTM(context, ovalWidth, ovalHeight); CGFloat fw = CGRectGetWidth(rect) / ovalWidth; CGFloat 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); } @end |
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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 *)roundCornersOfImage:(UIImage *)source; { int w = source.size.width; int h = source.size.height; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst); CGContextBeginPath(context); CGRect rect = CGRectMake(0, 0, w, h); addRoundedRectToPath(context, rect, 5, 5); CGContextClosePath(context); CGContextClip(context); CGContextDrawImage(context, CGRectMake(0, 0, w, h), source.CGImage); CGImageRef imageMasked = CGBitmapContextCreateImage(context); CGContextRelease(context); CGColorSpaceRelease(colorSpace); return [UIImage imageWithCGImage:imageMasked]; } |