Pointillize Image

gistfile1.txt

- (UIImage *)pointillizedImageFromImage:(UIImage *)image withPointDiameter:(CGFloat)diameter
{
	CGFloat width = image.size.width;
	CGFloat height = image.size.height;
	
	CGImageRef inImage = [image CGImage];
	CFDataRef m_dataRef = CGDataProviderCopyData(CGImageGetDataProvider(inImage));
	UInt8* m_pixelBuf = (UInt8*)CFDataGetBytePtr(m_dataRef);
	
	UIGraphicsBeginImageContextWithOptions(image.size, YES, 0);
	CGContextRef ctx = UIGraphicsGetCurrentContext();

	for (int row = 0; row < height/diameter; row++) {
		for (int col = 0; col < width/diameter; col++) {
			
			int x = diameter * (col + 0.5);
			int y = diameter * (row + 0.5);
			
			int pix = 4 * (width * y + x);
			
			int red = m_pixelBuf[pix];
			int green = m_pixelBuf[pix+1];
			int blue = m_pixelBuf[pix+2];
			
			
			
			CGContextSetRGBFillColor(ctx, red/255.0f, green/255.0f, blue/255.0f, 1);
//			CGContextFillEllipseInRect(ctx, CGRectMake(diameter * col + (arc4random_uniform(100)/(100/diameter) - diameter), diameter * row + (arc4random_uniform(100)/(100/diameter) - diameter), diameter, diameter));
			
			CGContextFillEllipseInRect(ctx, CGRectMake(diameter * col, diameter * row, diameter, diameter));
		}
	}
	
	CGImageRef imageRef = CGBitmapContextCreateImage(ctx);
	CGContextRelease(ctx);
	UIImage* finalImage = [UIImage imageWithCGImage:imageRef];
	CGImageRelease(imageRef);
	CFRelease(m_dataRef);
	return finalImage;
}