EverythingSolution/gist:1255741

## gistfile1.txt
static inline CGColorSpaceRef GetDeviceGrayScaleColorSpace(void)
{
	static CGColorSpaceRef	deviceGrayscaleSpace = NULL;
	if (deviceGrayscaleSpace == NULL)
		deviceGrayscaleSpace = CGColorSpaceCreateDeviceGray();
	return deviceGrayscaleSpace;
}

static inline CGContextRef CreateGrayScaleCGBitmapContextForWidthAndHeight(void *data,
																  unsigned int width,
																  unsigned int height)
{
	CGColorSpaceRef	colorSpace	= GetDeviceGrayScaleColorSpace();
	CGBitmapInfo	alphaInfo	= kCGImageAlphaNone;
	return CGBitmapContextCreate(
								 data,
								 width,
								 height,
								 8,
								 width,
								 colorSpace,
								 alphaInfo
								 );
}

static inline CGColorSpaceRef GetDeviceRGBColorSpace(void)
{
	static CGColorSpaceRef	deviceRGBSpace	= NULL;
	if (deviceRGBSpace == NULL)
		deviceRGBSpace	= CGColorSpaceCreateDeviceRGB();
	return deviceRGBSpace;
}

static inline CGContextRef CreateCGBitmapContextForWidthAndHeight(void *data,
																	unsigned int width,
																	unsigned int height)
{
	CGColorSpaceRef	colorSpace	= GetDeviceRGBColorSpace();
	CGBitmapInfo	alphaInfo	= kCGImageAlphaNoneSkipLast | kCGBitmapByteOrder32Host;
	return CGBitmapContextCreate(
								 data,
								 width,
								 height,
								 8,
								 width*4,
								 colorSpace,
								 alphaInfo
								 );
}

#import "WebViewController.h"
#import <QuartzCore/QuartzCore.h>
@implementation WebViewController
@synthesize webView=_webView;
@synthesize renderedWebView=_renderedWebView;

- (void)viewDidLoad
{
	[super viewDidLoad];

	CGRect rect = self.view.bounds;
	rect.size.width /= 2;
	self.renderedWebView = [[UIImageView alloc] initWithFrame:rect];
	self.renderedWebView.contentMode = UIViewContentModeTopLeft;
	[self.view addSubview:self.renderedWebView];

	rect.origin.x += rect.size.width;
	self.webView = [[UIWebView alloc] initWithFrame:rect];
	self.webView.delegate = self;
	[self.view addSubview:self.webView];

	[self.webView loadHTMLString:@"<html><body><p style=\"font-size:500%;font-family:Baskerville-Italic;\">Lorem ipsum dolor</p></body></html>" baseURL:nil];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
	// Make sure the webview is the right size
	CGRect frame = self.webView.frame;
	frame.size.height = 1;
	self.webView.frame = frame;
	CGSize size = [self.webView sizeThatFits:CGSizeZero];
	frame.size = size;
	self.webView.frame = frame;
	// Render the webview into a grayscale context that is triple wide
	CGFloat scale = [[UIScreen mainScreen] scale];
	CGContextRef grayscaleContext = CreateGrayScaleCGBitmapContextForWidthAndHeight(NULL, size.width*scale * 3.0, size.height*scale);
	CGContextTranslateCTM(grayscaleContext, 0.0, size.height*scale);
	CGContextScaleCTM(grayscaleContext, scale, -scale);
	CGContextScaleCTM(grayscaleContext, 3.0, 1.0);
	[self.webView.layer renderInContext:grayscaleContext];
	// move the gray scale pixels into a byte array arranged for RGBX
	void * src = CGBitmapContextGetData(grayscaleContext);
	void * dest = malloc(size.width*scale*size.height*scale*4);
	char* src8 = (char*)src;
	char* dst8 = (char*)dest;
	int count = (int)(size.width * scale * size.height * scale);
	for (int i = 0; i < count; i++)
	{
		*dst8++ = (char)0;
		*dst8++ = *src8++;
		*dst8++ = *src8++;
		*dst8++ = *src8++;
	}
	// Get the image
	CGContextRef rgbContext = CreateCGBitmapContextForWidthAndHeight(dest, size.width*scale, size.height*scale);
	CGImageRef webViewImageRef = CGBitmapContextCreateImage(rgbContext);
	UIImage* webViewImage = [UIImage imageWithCGImage:webViewImageRef scale:scale orientation:UIImageOrientationUp];
	self.renderedWebView.image = webViewImage;
	// Cleanup
	CGImageRelease(webViewImageRef);
	CGContextRelease(rgbContext);
	CGContextRelease(grayscaleContext);
	free(dest);
}

@end
	static inline CGColorSpaceRef GetDeviceGrayScaleColorSpace(void)
	{
	static CGColorSpaceRef deviceGrayscaleSpace = NULL;
	if (deviceGrayscaleSpace == NULL)
	deviceGrayscaleSpace = CGColorSpaceCreateDeviceGray();
	return deviceGrayscaleSpace;
	}

	static inline CGContextRef CreateGrayScaleCGBitmapContextForWidthAndHeight(void *data,
	unsigned int width,
	unsigned int height)
	{
	CGColorSpaceRef colorSpace = GetDeviceGrayScaleColorSpace();
	CGBitmapInfo alphaInfo = kCGImageAlphaNone;
	return CGBitmapContextCreate(
	data,
	width,
	height,
	8,
	width,
	colorSpace,
	alphaInfo
	);
	}

	static inline CGColorSpaceRef GetDeviceRGBColorSpace(void)
	{
	static CGColorSpaceRef deviceRGBSpace = NULL;
	if (deviceRGBSpace == NULL)
	deviceRGBSpace = CGColorSpaceCreateDeviceRGB();
	return deviceRGBSpace;
	}

	static inline CGContextRef CreateCGBitmapContextForWidthAndHeight(void *data,
	unsigned int width,
	unsigned int height)
	{
	CGColorSpaceRef colorSpace = GetDeviceRGBColorSpace();
	CGBitmapInfo alphaInfo = kCGImageAlphaNoneSkipLast \| kCGBitmapByteOrder32Host;
	return CGBitmapContextCreate(
	data,
	width,
	height,
	8,
	width*4,
	colorSpace,
	alphaInfo
	);
	}

	#import "WebViewController.h"
	#import <QuartzCore/QuartzCore.h>
	@implementation WebViewController
	@synthesize webView=_webView;
	@synthesize renderedWebView=_renderedWebView;

	- (void)viewDidLoad
	{
	[super viewDidLoad];

	CGRect rect = self.view.bounds;
	rect.size.width /= 2;
	self.renderedWebView = [[UIImageView alloc] initWithFrame:rect];
	self.renderedWebView.contentMode = UIViewContentModeTopLeft;
	[self.view addSubview:self.renderedWebView];

	rect.origin.x += rect.size.width;
	self.webView = [[UIWebView alloc] initWithFrame:rect];
	self.webView.delegate = self;
	[self.view addSubview:self.webView];

	[self.webView loadHTMLString:@"<html><body><p style=\"font-size:500%;font-family:Baskerville-Italic;\">Lorem ipsum dolor</p></body></html>" baseURL:nil];
	}

	- (void)webViewDidFinishLoad:(UIWebView *)webView
	{
	// Make sure the webview is the right size
	CGRect frame = self.webView.frame;
	frame.size.height = 1;
	self.webView.frame = frame;
	CGSize size = [self.webView sizeThatFits:CGSizeZero];
	frame.size = size;
	self.webView.frame = frame;
	// Render the webview into a grayscale context that is triple wide
	CGFloat scale = [[UIScreen mainScreen] scale];
	CGContextRef grayscaleContext = CreateGrayScaleCGBitmapContextForWidthAndHeight(NULL, size.widthscale 3.0, size.height*scale);
	CGContextTranslateCTM(grayscaleContext, 0.0, size.height*scale);
	CGContextScaleCTM(grayscaleContext, scale, -scale);
	CGContextScaleCTM(grayscaleContext, 3.0, 1.0);
	[self.webView.layer renderInContext:grayscaleContext];
	// move the gray scale pixels into a byte array arranged for RGBX
	void * src = CGBitmapContextGetData(grayscaleContext);
	void * dest = malloc(size.widthscalesize.heightscale4);
	char* src8 = (char*)src;
	char* dst8 = (char*)dest;
	int count = (int)(size.width * scale * size.height * scale);
	for (int i = 0; i < count; i++)
	{
	*dst8++ = (char)0;
	dst8++ = src8++;
	dst8++ = src8++;
	dst8++ = src8++;
	}
	// Get the image
	CGContextRef rgbContext = CreateCGBitmapContextForWidthAndHeight(dest, size.widthscale, size.heightscale);
	CGImageRef webViewImageRef = CGBitmapContextCreateImage(rgbContext);
	UIImage* webViewImage = [UIImage imageWithCGImage:webViewImageRef scale:scale orientation:UIImageOrientationUp];
	self.renderedWebView.image = webViewImage;
	// Cleanup
	CGImageRelease(webViewImageRef);
	CGContextRelease(rgbContext);
	CGContextRelease(grayscaleContext);
	free(dest);
	}

	@end