Created
August 4, 2009 04:09
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+(UIImage *)makeRoundCornerImage : (UIImage*) img : (int) cornerWidth : (int) cornerHeight | |
{ | |
UIImage * newImage = nil; | |
if( nil != img) | |
{ | |
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; | |
int w = img.size.width; | |
int h = img.size.height; | |
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]; | |
newImage = [[UIImage imageWithCGImage:imageMasked] retain]; | |
CGImageRelease(imageMasked); | |
[pool release]; | |
} | |
return newImage; | |
} | |
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); | |
} |
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