/**
* <summary>Gets whether the specified content stream part is blank.</summary>
* <param name="level">Content stream part to evaluate.</param>
* <param name="contentBox">Area to evaluate within the page.</param>
*/
private static bool IsBlank(
ContentScanner level,
RectangleF contentBox
)
{
if (level == null)
{
return(true);
}
while (level.MoveNext())
{
ContentObject content = level.Current;
if (content is ContainerObject)
{
// Scan the inner level!
if (!IsBlank(level.ChildLevel, contentBox))
{
return(false);
}
}
else
{
ContentScanner.GraphicsObjectWrapper contentWrapper = level.CurrentWrapper;
if (contentWrapper == null)
{
continue;
}
if (contentWrapper.Box.Value.IntersectsWith(contentBox))
{
return(false);
}
}
}
return(true);
}
/**
* <summary>Scans a content level looking for images.</summary>
*/
/*
* NOTE: Page contents are represented by a sequence of content objects,
* possibly nested into multiple levels.
*/
private void Scan(
ContentScanner level,
Page page
)
{
if (level == null)
{
return;
}
while (level.MoveNext())
{
ContentObject current = level.Current;
if (current is ContainerObject)
{
// Scan the inner level!
Scan(
level.ChildLevel,
page
);
}
else
{
ContentScanner.GraphicsObjectWrapper objectWrapper = level.CurrentWrapper;
if (objectWrapper == null)
{
continue;
}
/*
* NOTE: Images can be represented on a page either as
* external objects (XObject) or inline objects.
*/
SizeF?imageSize = null; // Image native size.
if (objectWrapper is ContentScanner.XObjectWrapper)
{
ContentScanner.XObjectWrapper xObjectWrapper = (ContentScanner.XObjectWrapper)objectWrapper;
xObjects::XObject xObject = xObjectWrapper.XObject;
// Is the external object an image?
if (xObject is xObjects::ImageXObject)
{
Console.Write(
"External Image '" + xObjectWrapper.Name + "' (" + xObject.BaseObject + ")" // Image key and indirect reference.
);
imageSize = xObject.Size; // Image native size.
}
}
else if (objectWrapper is ContentScanner.InlineImageWrapper)
{
Console.Write("Inline Image");
InlineImage inlineImage = ((ContentScanner.InlineImageWrapper)objectWrapper).InlineImage;
imageSize = inlineImage.Size; // Image native size.
}
if (imageSize.HasValue)
{
RectangleF box = objectWrapper.Box.Value; // Image position (location and size) on the page.
Console.WriteLine(
" on page " + page.Number + " (" + page.BaseObject + ")" // Page index and indirect reference.
);
Console.WriteLine(" Coordinates:");
Console.WriteLine(" x: " + Math.Round(box.X));
Console.WriteLine(" y: " + Math.Round(box.Y));
Console.WriteLine(" width: " + Math.Round(box.Width) + " (native: " + Math.Round(imageSize.Value.Width) + ")");
Console.WriteLine(" height: " + Math.Round(box.Height) + " (native: " + Math.Round(imageSize.Value.Height) + ")");
}
}
}
}