Thank you very much for your reply.
It seems that there isn't any existing API I can use and I've got to write
quite tremendous pieces of code, such as parsing TTF files, extracting font
data, combining them to an XObject Font stream, mapping between glyphs and
Unicode values, reparsing and rewriting the content streams...
No wonder why "iText Info" replied with "non-trivial things" and then left.
>________________________________
> From: Leonard Rosenthol <lrose...@adobe.com>
>To: WMJ <sd_...@yahoo.com>; Post all your questions about iText here
><itext-questions@lists.sourceforge.net>
>Sent: Sunday, September 9, 2012 3:29 PM
>Subject: Re: [iText-questions] How to subset fonts into an existing PDF file
>
>
>Exactly!
>
>
>Well, normally this is done as part of the content stream generation and font
>subletting process. You can see how iText itself does it during PDF creation
>by reviewing the code used to produce the text operators.
>
>
>I suspect that you will need to do something similar as you rewrite each
>stream and subset each font.
>
>
>Leonard
>
>From: WMJ <sd_...@yahoo.com>
>Reply-To: WMJ <sd_...@yahoo.com>, Post here
><itext-questions@lists.sourceforge.net>
>To: Post here <itext-questions@lists.sourceforge.net>
>Subject: Re: [iText-questions] How to subset fonts into an existing PDF file
>
>
>
>I see. I've got to replace the original character code to the glyph index of
>the subset font.
>
>
>Now, how can I get the needed font data and the index of the extracted glyphs?
>
>
>
>
>
>>________________________________
>> From: Leonard Rosenthol <lrose...@adobe.com>
>>To: WMJ <sd_...@yahoo.com>; Post all your questions about iText here
>><itext-questions@lists.sourceforge.net>
>>Sent: Friday, September 7, 2012 7:34 PM
>>Subject: RE: [iText-questions] How to subset fonts into an existing PDF file
>>
>>
>>Yes, you must. Because in a subset font, you no longer use standard
>>encodings (such as ASCII or SJIS or Unicode) – it’s always a custom
>>encoding. As such, you need to remap your values to the new encoding.
>>
>>Leonard
>>
>>From:WMJ [mailto:sd_...@yahoo.com]
>>Sent: Thursday, September 06, 2012 9:03 PM
>>To: iTextQuestions
>>Subject: Re: [iText-questions] How to subset fonts into an existing PDF file
>>
>>Hi,
>>
>>Thanks for the information.
>>Must I rewrite the page content stream?
>>Since the character code in the original document lacks a ToUnicode section,
>>thus all content streams in the document which use that font share the same
>>encoding.
>>I think that reconstructing a ToUnicode stream for that font is sufficient.
>>
>>>
>>>________________________________
>>>
>>>From:Leonard Rosenthol <lrose...@adobe.com>
>>>To: WMJ <sd_...@yahoo.com>
>>>Sent: Thursday, September 6, 2012 8:30 PM
>>>Subject: RE: [iText-questions] How to subset fonts into an existing PDF file
>>>
>>>Because of the way that font subsetting works, you can’t just “inject them
>>>into the PDF”. You will also need to rewrite every single content stream in
>>>the PDF that refers to that font, since the character code references will
>>>no longer be correct.
>>>
>>>Leonard
>>>
>>>From:WMJ [mailto:sd_...@yahoo.com]
>>>Sent: Thursday, September 06, 2012 8:17 AM
>>>To: Leonard Rosenthol
>>>Subject: Re: [iText-questions] How to subset fonts into an existing PDF file
>>>
>>>Hi,
>>>
>>>I know quite well about the differences between embedding and subsetting and
>>>I do have the font ready for subsetting. By scanning and analyzing the
>>>document with iText, I also know quite well what characters will be needed
>>>in the subsetting process.
>>>
>>>For example, now I have a PDF document which uses an external font, FontA
>>>for instance, which is already installed on my computer. So, the document
>>>looks OK, but on other computers without FontA, it is
unreadable.
>>>The PDF document uses 10,000 characters and the FontA has 30,000 characters
>>>available. Embedding the whole FontA is uneconomic, since the other 20,000
>>>characters are not used by the document. Therefore, I want to extract the
>>>needed 10,000 character data from FontA and subset them to that PDF
>>>document. Afterward, the document is portable to other computers which do
>>>not have FontA installed.
>>>
>>>I just wonder whether there's a way to extract the needed character data
>>>from the existing font and inject them into existing PDF files.
>>>
>>>Embedding is well explained in the book iText in Action. Could you please
>>>tell me if there are APIs available for subsetting?
>>>
>>>
>>>
>>>>
>>>>________________________________
>>>>
>>>>From:Leonard Rosenthol <lrose...@adobe.com>
>>>>To: WMJ <sd_...@yahoo.com>; Post all your questions about iText here
>>>><itext-questions@lists.sourceforge.net>
>>>>Sent: Thursday, September 6, 2012 7:33 PM
>>>>Subject: RE: [iText-questions] How to subset fonts into an existing PDF file
>>>>
>>>>I think you are confusing EMBEDDED (where some/all of the font data lives
>>>>inside of the PDF) with SUBSETTED (where the font is embedded BUT only part
>>>>of it). If the fonts aren’t installed and you have problems, that
>>>>EMBEDDED.
>>>>
>>>>So forget about subsetting, you just need to embed.
>>>>
>>>>And in order to do that, you will need to have the fonts and then it it’s
>>>>fairly straightforward to embed them into a PDF.
>>>>
>>>>Leonard
>>>>
>>>>From:WMJ [mailto:sd_...@yahoo.com]
>>>>Sent: Wednesday, September 05, 2012 11:34 PM
>>>>To: iTextQuestions
>>>>Subject: [iText-questions] How to subset fonts into an existing PDF file
>>>>
>>>>I've gotten an existing PDF file which contains fonts that is not
>>>>subsetted. If the fonts are not installed in the system, the document can't
>>>>be displayed correctly. I definitely know what fonts are suitable for those
>>>>document. How can I subset those fonts into the PDF file?
>>>>
>>>
>>
>>
>
>
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