How do you change the Back and Foreground Color of a CIFilter CIQRCodeGenerator Filter

Question

I\'m trying to make a QR Code Generator for OS X but i haven\'t had succession in making a QRCode that can be more colourful that the black and white ones I\'m using the CIQRCod

Answer 1

Heres the Code that works Now :-

+ (NSImage *)createQRImageForString:(NSString *)string backgroundColor:(CIColor*)iBackgroundColor foregroundColor:(CIColor*)iForegroundColor size:(CGSize)size {

CIImage *image;
CIFilter *filter;
CIFilter *filterColor;

// Setup the QR filter with our string
filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
[filter setDefaults];

NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
[filter setValue:data forKey:@"inputMessage"];
image = [filter valueForKey:@"outputImage"];

filterColor = [CIFilter filterWithName:@"CIFalseColor" keysAndValues:@"inputImage", image, @"inputColor0", iForegroundColor, @"inputColor1", iBackgroundColor, nil];
//[filterColor setDefaults];

image = [filterColor valueForKey:@"outputImage"];


//image = [CIImage imageWithColor:[CIColor colorWithRed:1 green: 0 blue: 0]];

// Calculate the size of the generated image and the scale for the desired image size
CGRect extent = CGRectIntegral(image.extent);
CGFloat scale = MIN(size.width / CGRectGetWidth(extent), size.height / CGRectGetHeight(extent));

// Since CoreImage nicely interpolates, we need to create a bitmap image that we'll draw into
// a bitmap context at the desired size;
size_t width = CGRectGetWidth(extent) * scale;
size_t height = CGRectGetHeight(extent) * scale;
CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 256*4, cs, (CGBitmapInfo)kCGImageAlphaPremultipliedFirst);

#if TARGET_OS_IPHONE
CIContext *context = [CIContext contextWithOptions:nil];
#else
CIContext *context = [CIContext contextWithCGContext:bitmapRef options:nil];
#endif

CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];

CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
CGContextScaleCTM(bitmapRef, scale, scale);
CGContextDrawImage(bitmapRef, extent, bitmapImage);

// Create an image with the contents of our bitmap
CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);

// Cleanup
CGContextRelease(bitmapRef);
CGImageRelease(bitmapImage);

return [[NSImage alloc] initWithCGImage:scaledImage size:NSZeroSize];
}