gistfile1.m

// CocoasTools.h

#define cts(p) [CocosTools scalePoint:(p)]
#define cti(i) [CocosTools scaleImage:(i)]

@interface CocosTools : NSObject {

}

+ (CGFloat)scalePoint:(CGFloat)size;
+ (NSString *)scaleImage:(NSString *)image;

@end


// CocosTool.m
#import "CocosTools.h"
#import "CCDirector.h"

@implementation CocosTools

+ (CGFloat)scalePoint:(CGFloat)size {
	CCDirector *director = [CCDirector sharedDirector];
	[director contentScaleFactor];
	if (director.contentScaleFactor == 2) {
		return size * 2;
	} else {
		return size;
	}
}

+ (NSString *)scaleImage:(NSString *)imageName {
	CCDirector *director = [CCDirector sharedDirector];
	[director contentScaleFactor];
	if (director.contentScaleFactor == 2) {
		NSArray *chunks = [imageName componentsSeparatedByString:@"."];
		return [NSString stringWithFormat:@"%@@2x.%@", [chunks objectAtIndex:0], [chunks objectAtIndex:1]];
	} else {
		return imageName;
	}
}


@end