private static void ProcessPageObject(PdfPage page, PdsPageObject obj, string savePath)
{
if (obj == null)
{
PdfixEngine.ThrowException();
}
switch (obj.GetObjectType())
{
case PdfPageObjectType.kPdsPageImage:
ExtractImage(page, (PdsImage)obj, savePath);
break;
case PdfPageObjectType.kPdsPageForm:
{
var form = (PdsForm)obj;
var content = form.GetContent();
for (int i = 0; i < content.GetNumObjects(); i++)
{
ProcessPageObject(page, content.GetObject(i), savePath);
}
}
break;
}
}
//////////////////////////////////////////////////////////////////////////////////////////////////
// GetPageObjectTextState
// get text object's of specified mcid the text state
//////////////////////////////////////////////////////////////////////////////////////////////////
static PdfTextState GetPageObjectTextState(PdsPageObject page_object, int mcid)
{
if (page_object.GetObjectType() == PdfPageObjectType.kPdsPageText)
{
PdsText text = (PdsText)page_object;
// check if this text page object has the same mcid
PdsContentMark content_mark = page_object.GetContentMark();
if (content_mark != null && content_mark.GetTagMcid() == mcid)
{
PdfTextState ts = text.GetTextState();
if (ts.font != null)
{
return(ts);
}
}
}
else if (page_object.GetObjectType() == PdfPageObjectType.kPdsPageForm)
{
// search for the text object inside of the form XObject
PdsForm form = (PdsForm)page_object;
var content = form.GetContent();
for (int i = 0; i < content.GetNumObjects(); i++)
{
var ts = GetPageObjectTextState(content.GetObject(i), mcid);
if (ts.font != null)
{
return(ts);
}
}
}
return(new PdfTextState());
}
// get the ocg layers of the page object
internal static List <KeyValuePair <string, int> > GetPageObjectLayers(PdsPageObject page_object)
{
List <KeyValuePair <string, int> > layers = new List <KeyValuePair <string, int> >();
var content_mark = page_object.GetContentMark();
if (content_mark != null)
{
for (var i = 0; i < content_mark.GetNumTags(); i++)
{
var name = content_mark.GetTagName(i);
if (name == "OC")
{
var content_mark_obj = content_mark.GetTagObject(i);
if (content_mark_obj != null)
{
void push_ocg(PdsDictionary ocg)
{
var ocg_name = ocg.GetText("Name");
var id = ocg.GetId();
layers.Add(new KeyValuePair <string, int>(ocg_name, id));
}
var type = content_mark_obj.GetText("Type");
if (type == "OCMD")
{
var ocgs_dict = content_mark_obj.GetDictionary("OCGs");
if (ocgs_dict != null)
{
push_ocg(ocgs_dict);
}
var ocgs_arr = content_mark_obj.GetArray("OCGs");
if (ocgs_arr != null)
{
for (var j = 0; j < ocgs_arr.GetNumObjects(); j++)
{
var ocg_dict = ocgs_arr.GetDictionary(j);
push_ocg(ocg_dict);
}
}
}
else if (type == "OCG")
{
push_ocg(content_mark_obj);
}
}
}
}
}
return(layers);
}
//////////////////////////////////////////////////////////////////////////////////////////////////
// GetParagraphBBox
// get the text state of the text objects inside paragraph by iterating content kid objects
//////////////////////////////////////////////////////////////////////////////////////////////////
private static bool GetStructElementBBox(PdsStructElement struct_elem, ref PdfRect bbox)
{
bool result = false;
for (int i = 0; i < struct_elem.GetNumChildren(); i++)
{
if (struct_elem.GetChildType(i) == PdfStructElementType.kPdsStructChildPageContent)
{
// acquire page on which the element is present
PdfDoc doc = struct_elem.GetStructTree().GetDoc();
PdfPage page = doc.AcquirePage(struct_elem.GetChildPageNumber(i));
// find text object with mcid on the page to get the text state
int mcid = struct_elem.GetChildMcid(i);
var content = page.GetContent();
for (int j = 0; j < content.GetNumObjects(); j++)
{
PdsPageObject page_object = content.GetObject(j);
// check if this text page object has the same mcid
PdsContentMark content_mark = page_object.GetContentMark();
if (content_mark != null && content_mark.GetTagMcid() == mcid)
{
PdfRect elem_bbox = page_object.GetBBox();
if ((bbox.left - bbox.right == 0) || (bbox.top - bbox.bottom == 0))
{
bbox = elem_bbox;
}
else
{
bbox.left = Math.Min(bbox.left, elem_bbox.left);
bbox.right = Math.Max(bbox.right, elem_bbox.right);
bbox.top = Math.Max(bbox.top, elem_bbox.top);
bbox.bottom = Math.Min(bbox.bottom, elem_bbox.bottom);
}
result = true;
}
}
}
else if (struct_elem.GetChildType(i) == PdfStructElementType.kPdsStructChildElement)
{
PdsObject kid_obj = struct_elem.GetChildObject(i);
PdsStructElement kid_elem = struct_elem.GetStructTree().GetStructElementFromObject(kid_obj);
GetStructElementBBox(kid_elem, ref bbox);
}
}
return(result);
}
//////////////////////////////////////////////////////////////////////////////////////////////////
// MarkUntaggedObjectsAsArtifact
// find any non-tagged objects in the page content and mark them as artifact
//////////////////////////////////////////////////////////////////////////////////////////////////
internal static void MarkUntaggedObjectsAsArtifact(PdfPage page)
{
PdfDoc doc = page.GetDoc();
for (int i = 0; i < page.GetNumPageObjects(); i++)
{
PdsPageObject page_obj = page.GetPageObject(i);
PdsContentMark content_mark = page_obj.GetContentMark();
if (!content_mark.GetTagArtifact() && content_mark.GetTagMcid() == -1)
{
PdsDictionary artifact_dict = doc.CreateDictObject(false);
artifact_dict.Put("Type", doc.CreateNameObject(false, "Pagination"));
artifact_dict.Put("Subtype", doc.CreateNameObject(false, "Footer"));
content_mark.AddTag("Artifact", artifact_dict, false);
}
}
page.SetContent();
}
// check page object if it fits to
internal static void CheckPageObject(PdsPageObject page_object, KeyValuePair <string, int> layer)
{
switch (page_object.GetObjectType())
{
case PdfPageObjectType.kPdsPageText:
{
var text_obj = (PdsText)page_object;
string text = text_obj.GetText();
var layers = GetPageObjectLayers(page_object);
foreach (KeyValuePair <string, int> l in layers)
{
if (layer.Key == l.Key && layer.Value == l.Value)
{
Console.WriteLine(text);
break;
}
}
}
break;
}
}
// collect all bounding boxes of the page object with specified mcid
static List <PdfRect> GetMcidBBoxes(PdsPageObject obj, int mcid)
{
var bboxes = new List <PdfRect>();
// check object mcid
var content_mark = obj.GetContentMark();
if (content_mark != null && content_mark.GetTagMcid() == mcid)
{
bboxes.Add(obj.GetBBox());
}
else
{
if (obj.GetObjectType() == PdfPageObjectType.kPdsPageForm)
{
var form_obj = (PdsForm)obj;
for (var i = 0; i < form_obj.GetNumPageObjects(); i++)
{
bboxes.AddRange(GetMcidBBoxes(form_obj.GetPageObject(i), mcid));
}
}
}
return(bboxes);
}
private static void ProcessPageObject(PdfPage page, PdsPageObject obj, string savePath)
{
if (obj == null)
{
throw new Exception(_pdfix.GetError());
}
switch (obj.GetObjectType())
{
case PdfPageObjectType.kPdsPageImage:
ExtractImage(page, (PdsImage)obj, savePath);
break;
case PdfPageObjectType.kPdsPageForm:
{
var form = (PdsForm)obj;
for (int i = 0; i < form.GetNumPageObjects(); i++)
{
ProcessPageObject(page, form.GetPageObject(i), savePath);
}
}
break;
}
}