Rendering 4 byte UTF-8(e.g. CJK extension B) characters in pdf using jPod

Gaurav Sood — Fri, 12 Jun 2015 06:52:16 -0000

Thanks for your time.

Rendering 4 byte UTF-8(e.g. CJK extension B) characters in pdf using jPod

Elfi Heck — Thu, 11 Jun 2015 13:34:21 -0000

I've done some reading now. As you probably know, we use Freetype for font handling. This page http://freetype.org/freetype2/docs/glyphs/glyphs-5.html tells me that you need something called a "shaping engine" to find glyph indices for certain scripts. We definitely don't have such a thing. And we also don't have the time unfortunately to write glue code for one.

Anyone more knowlegdeable about fonts should feel free to correct me if there is an easier way.

Rendering 4 byte UTF-8(e.g. CJK extension B) characters in pdf using jPod

Elfi Heck — Wed, 10 Jun 2015 12:08:43 -0000

I'm sorry to say that unmodified jPod cannot handle 4-byte characters. Here's a post from another user who already did some research on what would have to be changed to support them: https://sourceforge.net/p/jpodlib/patches/3. We are aware that we should incorporate his work in our code, but other projects have interfered all the time.

I'll see, if I can find out how big a change this would be, and get back to you.

Rendering 4 byte UTF-8(e.g. CJK extension B) characters in pdf using jPod

Gaurav Sood — Wed, 10 Jun 2015 09:52:22 -0000

I am new to jPod and trying to create a pdf from xml file. I am looking for supporting Utf-8 4 byte character set for e.g CJK Ideograph Extension B/C . These are the code points with U+20000 ~ U+2FA1F. Can anyone please help me achieving it using jPod?

Thanks

PageLabels entry in COSCatalog

Maurizio M. Gavioli — Mon, 08 Jun 2015 22:04:15 -0000

Thanks for the quick reply. It has not been over-easy, but I managed to get some results.

This is a sample (and rather dumb) function which implements the PageLabels example in section 12.4.2 of PDF 1.7 ISO Reference (PDF3200-2088.pdf). It is very simple-minded for ease of understanding and debugging and I am sure there is ample room for improvement; however, it does work and can be a useful starting point.

Thanks!

Maurizio

void createPageLabels(COSDocument doc)
{
    // create the array to hold the number tree entries
    COSArray            numsArray   = COSArray.create();

    // create a number tree entry starting at page 0 with "S"tyle as lower-case "r"oman numerals
    COSInteger      number0     = COSInteger.create(0);
    COSDictionary   value0      = COSDictionary.create();
    value0.put(COSName.create("S"), COSName.create("r"));
    numsArray.add(number0);
    numsArray.add(value0);

    // create an entry starting at page 4 with "S"tyle as "D"ecimal numerals
    COSInteger      number4     = COSInteger.create(4);
    COSDictionary   value4      = COSDictionary.create();
    value4.put(COSName.create("S"), COSName.create("D"));
    numsArray.add(number4);
    numsArray.add(value4);

    // create an entry starting at page 7 with "S"tyle as "D"ecimal numerals,
    // "P"refix "A-" and "St"arting with number 8
    COSInteger      number7 = COSInteger.create(7);
    COSDictionary   value7      = COSDictionary.create();
    value7.put(COSName.create("S"),  COSName   .create("D"));
    value7.put(COSName.create("P"),  COSString .create("A-"));
    value7.put(COSName.create("St"), COSInteger.create(8));
    numsArray.add(number7);
    numsArray.add(value7);

    // create a single-entry dictionary for the << /Nums numArray >> association
    // and add it to the doc catalogue
    COSDictionary   pageLabels  = COSDictionary.create();
    pageLabels.put(COSName.create("Nums"), numsArray);
    doc.getCatalog().cosSetField(COSCatalog.DK_PageLabels, pageLabels);
}

PageLabels entry in COSCatalog

Elfi Heck — Mon, 08 Jun 2015 12:52:53 -0000

If something's not implemented you can always set the document structure on the COS level, but you knew that already. That said, your first snippet will work when "myPageLabels" is a COSDictionary set up in the appropriate structure. Post again if you can't figure out from the PDF reference what it should look like.

Your second snippet will not work, simply because there is no COSBasedObject representing a page labels number tree.

PageLabels entry in COSCatalog

Maurizio M. Gavioli — Mon, 08 Jun 2015 08:52:51 -0000

I am using latest released jPod version. Is there any specific support for the /PageLabels entry of the PDF document catalogue?

I noticed the COSName DK_PageLabels is defined in COSCatalog but I was not able to find any other mention of that entry in jPod documentation.

If I overlooked something, a pointer would be very welcome. If there is no direct support, I would appreciate some initial hint. May I expect either of the following to work?

myDocCatalogue.cosSetField(DK_PageLabels, myPageLabels);

myDocCatalogue.setFieldObject(DK_PageLabels, myPageLabels);

As CDSNumberTreeNode is also not implemented yet, is there any specific care I should take while constructing the myPageLabels object?

Thanks!

Maurizio M. Gavioli

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MiguelAngerer — Thu, 19 Mar 2015 13:37:32 -0000

Yes exactly thanks alot i think that should be enough to start with :) thanks alot.

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Elfi Heck — Thu, 19 Mar 2015 13:19:02 -0000

So you want some kind of tree? With the ability to expand or collapse an item? If so, you can do that easily. The destination in an outline item is optional. You can create separate outline items for the categories and use them as parents instead of "root" for the actual bookmarks. If that's not what you want, please elaborate further.

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MiguelAngerer — Thu, 19 Mar 2015 12:51:25 -0000

I want the Table of Content to be seperate by Parents like:
Normal View

Normal
Spezial
Others

View when i click on the Names

v Normal
(bookmarks)
(bookmarks)
(bookmarks)
(bookmarks)
v Spezial
(bookmarks)
(bookmarks)
(bookmarks)
(bookmarks)
v Others
(bookmarks)
(bookmarks)
(bookmarks)
(bookmarks)

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PageLabels entry in COSCatalog

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