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| /* NSImage+RoundCorner.h */
#import <Foundation/Foundation.h>
/* C Prototypes */
void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth, float ovalHeight);
@interface NSImage(RoundCorner)
- (NSImage *)roundCornersImageCornerRadius:(NSInteger)radius;
@end
/* NSImage+RoundCorner.m */
#import "NSImage+RoundCorner.h"
@implementation NSImage (RoundCorner)
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);
}
- (NSImage *)roundCornersImageCornerRadius:(NSInteger)radius {
int w = (int) self.size.width;
int h = (int) self.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, radius, radius);
CGContextClosePath(context);
CGContextClip(context);
CGImageRef cgImage = [[NSBitmapImageRep imageRepWithData:[self TIFFRepresentation]] CGImage];
CGContextDrawImage(context, CGRectMake(0, 0, w, h), cgImage);
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
NSImage *tmpImage = [[NSImage alloc] initWithCGImage:imageMasked size:self.size];
NSData *imageData = [tmpImage TIFFRepresentation];
NSImage *image = [[NSImage alloc] initWithData:imageData];
[tmpImage release];
return [image autorelease];
}
@end
|
