Utilities.m

@implementation UIImage(Utilities)

-(UIImage *)scaledToSize:(CGSize)size {
	// if we're already that size, just return us
	if(fabs([self size].width - size.width) < 0.001 && fabs([self size].height - size.height) < 0.001) {
		return [[self retain] autorelease]; // we need to do this so that we could release the "original" before retaining the resized "copy"
	}	
	
	int pixelsWide = size.width + 0.5;
	int pixelsHigh = size.height + 0.5;	
    int bitmapBytesPerRow   = (pixelsWide * 4);
    int bitmapByteCount     = (bitmapBytesPerRow * pixelsHigh);
	
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    void *bitmapData = malloc(bitmapByteCount);
    assert(bitmapData);
    CGContextRef context = CGBitmapContextCreate(bitmapData,
												 pixelsWide,
												 pixelsHigh,
												 8,      // bits per component
												 bitmapBytesPerRow,
												 colorSpace,
												 kCGImageAlphaPremultipliedLast);
    assert(context);
    CGColorSpaceRelease(colorSpace);

	CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
	CGContextDrawImage(context, CGRectMake(0, 0, pixelsWide, pixelsHigh), [self CGImage]);
	
	CGImageRef image = CGBitmapContextCreateImage(context);
	CGContextRelease(context);
	
	UIImage *uiImage = [[[UIImage alloc] initWithCGImage:image] autorelease];
	CGImageRelease(image);
	
	free(bitmapData);
	
	return uiImage;
	
//  buggy building on 4.0 targeting 3.1.3...
//	assert([NSThread isMainThread]);
//	UIGraphicsBeginImageContext(size);
//	CGContextSetInterpolationQuality(UIGraphicsGetCurrentContext(), kCGInterpolationHigh);
//	[self drawInRect:CGRectMake(-10,-10,size.width+20,size.height+20)]; // kludge to ensure we always fill the canvas
//	[self drawInRect:CGRectMake(0,0,size.width,size.height)]; // draw it properly
//	UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
//	UIGraphicsEndImageContext();
	
//	return newImage;
}

@end