Titanium takeScreenshot code

MediaModule.h

-(void)takeScreenshot:(id)arg
{
    ENSURE_SINGLE_ARG(arg,KrollCallback);
    ENSURE_UI_THREAD(takeScreenshot,arg);
    
    // Create a graphics context with the target size
    
    CGSize imageSize = [[UIScreen mainScreen] bounds].size;
    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    // Iterate over every window from back to front
    for (UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        if (![window respondsToSelector:@selector(screen)] || [window screen] == [UIScreen mainScreen])
        {
            // -renderInContext: renders in the coordinate space of the layer,
            // so we must first apply the layer's geometry to the graphics context
            CGContextSaveGState(context);
            // Center the context around the window's anchor point
            CGContextTranslateCTM(context, [window center].x, [window center].y);
            // Apply the window's transform about the anchor point
            CGContextConcatCTM(context, [window transform]);
            // Offset by the portion of the bounds left of and above the anchor point
            CGContextTranslateCTM(context,
                                  -[window bounds].size.width * [[window layer] anchorPoint].x,
                                  -[window bounds].size.height * [[window layer] anchorPoint].y);
            
            // Render the layer hierarchy to the current context
            [[window layer] renderInContext:context];
            
            // Restore the context
            CGContextRestoreGState(context);
        }
    }
    
    // Retrieve the screenshot image
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    
    if (![TiUtils isIOS8OrGreater]) {
        UIInterfaceOrientation windowOrientation = [[UIApplication sharedApplication] statusBarOrientation];
        switch (windowOrientation) {
            case UIInterfaceOrientationPortraitUpsideDown:
                image = [UIImage imageWithCGImage:[image CGImage] scale:[image scale] orientation:UIImageOrientationDown];
                break;
            case UIInterfaceOrientationLandscapeLeft:
                image = [UIImage imageWithCGImage:[image CGImage] scale:[image scale] orientation:UIImageOrientationRight];
                break;
            case UIInterfaceOrientationLandscapeRight:
                image = [UIImage imageWithCGImage:[image CGImage] scale:[image scale] orientation:UIImageOrientationLeft];
                break;
            default:
                break;
        }
    }
    
    TiBlob *blob = [[[TiBlob alloc] initWithImage:image] autorelease];
    NSDictionary *event = [NSDictionary dictionaryWithObject:blob forKey:@"media"];
    [self _fireEventToListener:@"screenshot" withObject:event listener:arg thisObject:nil];
}