This is just starter - what I would try to do first from curiosity as I suppose it may actually work in certain circumstances. There may be needed some additional mapping or other things. For correctly doing this I would read for example something about CID Fonts and other things about fonts in pdf (I did not research this much).
On Thu, Feb 27, 2020 at 5:18 PM Michal Sudolsky <sudols...@gmail.com> wrote: > Hi, > > This podofo thread may be useful: > https://sourceforge.net/p/podofo/mailman/message/32419281/ > > So suppose font was added to pdf either by podofo api or manually as > described there if needed. > > You can get glyph ids and positions using HarfBuzz: > > 1. You may not be able to use PdfPainter api like DrawText or AddText > because they all handle unicode strings unless you somehow bypass this and > makes them accept glyph ids. But character positions may be incorrect > unless you draw individual glyphs into positions from HarfBuzz. > > 2. Glyph ids from HarfBuzz should be what is expected in PDF drawing > instructions like "Tj" without PdfPainter. You can follow what is doing > SetPage and DrawText in PdfPainter. First get PdfStream of page contents > like in SetPage "pdf.GetPage(n)->GetContentsForAppending()->GetStream()". > Call BeginAppend then Append whitespace and text operators and call > EndAppend. Like DrawText use operators like this: > > BT > /font_id font_size Tf > position_x position_y Td > <glyph_id_or_ids_as_hex> Tj > ET > > For example like this with single glyph id 0xAF12 and two glyphs 0x1234 > and 0xABCD (in pdf endian): > > BT > /Ft14 24 Tf > 10 20 Td > <AF12> Tj > 30 40 Td > <1234ABCD> Tj > ET > > You may need to read pdf reference about graphics state operators. If I am > not wrong "Td" uses relative coordinates so you may little play how to use > HarfBuzz offsets and "advance" based on their example. For correct > positioning you may need to draw each glyph individually or check "TJ" > which allows individual horizontal glyph positioning. > > On Thu, Feb 27, 2020 at 2:02 PM Anand Ramasamy <ramasam...@hcl.com> wrote: > >> Dear Michal, >> >> >> >> Thank you for your help in advance. >> >> >> >> We were able to generate the glyphs and shape it using HarfBuzz libraries. >> >> >> >> Is there any way to write the generated glyphs as text in PDF document >> using PoDoFo library? >> >> >> >> Regards, >> >> Anand. >> >> *From:* Anand Ramasamy >> *Sent:* Thursday, February 13, 2020 9:26 PM >> *To:* Michal Sudolsky <sudols...@gmail.com> >> *Cc:* podofo-users@lists.sourceforge.net >> *Subject:* RE: [Podofo-users] Arabic characters not displayed properly >> when AddText API is used. >> >> >> >> Dear Michal, >> >> >> >> Sorry for the delayed reply. >> >> >> >> Please let me know whether there are any chances for Arabic fonts to be >> supported by Podofo library in future. >> >> >> >> Regards, >> >> Anand. >> >> *From:* Michal Sudolsky <sudols...@gmail.com> >> *Sent:* Monday, November 18, 2019 7:48 PM >> *To:* Anand Ramasamy <ramasam...@hcl.com> >> *Cc:* podofo-users@lists.sourceforge.net >> *Subject:* Re: [Podofo-users] Arabic characters not displayed properly >> when AddText API is used. >> >> >> >> I am getting PdfError at "PdfString str1( ar.c_str() );": >> >> >> >> PoDoFo encountered an error. Error: 8 ePdfError_InternalLogic >> Error Description: An internal error occurred. >> Callstack: >> #0 Error Source: podofo/base/PdfString.cpp:171 >> >> >> >> My guess is that in order to join these characters you would need to do >> kerning (https://en.wikipedia.org/wiki/Kerning >> <https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FKerning&data=02%7C01%7Cramasamy-a%40hcl.com%7C451e8dcbe7b14a7d067b08d76c3216ed%7C189de737c93a4f5a8b686f4ca9941912%7C0%7C0%7C637096834699540974&sdata=dOFcg52fEIhHr7EPlaVs84Bbbce0fOrpeSAlCq%2BKKKs%3D&reserved=0>) >> or use ligatures/alternates ( >> https://en.wikipedia.org/wiki/Orthographic_ligature >> <https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FOrthographic_ligature&data=02%7C01%7Cramasamy-a%40hcl.com%7C451e8dcbe7b14a7d067b08d76c3216ed%7C189de737c93a4f5a8b686f4ca9941912%7C0%7C0%7C637096834699540974&sdata=TNtzRAY1FtjOhi%2FVqzGh6NOR%2FjlNjxSH6Y478zdfhww%3D&reserved=0>). >> From my observation podofo does not support these things: >> >> >> >> https://sourceforge.net/p/podofo/mailman/message/36260915/ >> <https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsourceforge.net%2Fp%2Fpodofo%2Fmailman%2Fmessage%2F36260915%2F&data=02%7C01%7Cramasamy-a%40hcl.com%7C451e8dcbe7b14a7d067b08d76c3216ed%7C189de737c93a4f5a8b686f4ca9941912%7C0%7C0%7C637096834699550969&sdata=igA8%2Bc9X0oFnW8lyJRQIILOqlePIv4OdnlyMUZGrHKQ%3D&reserved=0> >> >> https://sourceforge.net/p/podofo/mailman/message/36683139/ >> <https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsourceforge.net%2Fp%2Fpodofo%2Fmailman%2Fmessage%2F36683139%2F&data=02%7C01%7Cramasamy-a%40hcl.com%7C451e8dcbe7b14a7d067b08d76c3216ed%7C189de737c93a4f5a8b686f4ca9941912%7C0%7C0%7C637096834699550969&sdata=UTqo02i%2FFKMf264jZ9aAA%2F1hYIgU35t8aUN1I8MDMqo%3D&reserved=0> >> >> >> >> From what I googled indicates that seems truetype fonts do not support >> ligatures but opentype fonts do support them. And seems podofo does not >> support opentype fonts (also from my experience regarding font subsetting): >> >> >> >> https://sourceforge.net/p/podofo/mailman/message/21215446/ >> <https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsourceforge.net%2Fp%2Fpodofo%2Fmailman%2Fmessage%2F21215446%2F&data=02%7C01%7Cramasamy-a%40hcl.com%7C451e8dcbe7b14a7d067b08d76c3216ed%7C189de737c93a4f5a8b686f4ca9941912%7C0%7C0%7C637096834700260565&sdata=M2Qmmpq0D3t6Yg7yn%2Fw%2FYTO8uBZO%2BYfTvDt0P6nsN9s%3D&reserved=0> >> >> >> >> >> >> >> >> On Mon, Nov 18, 2019 at 8:50 AM Anand Ramasamy <ramasam...@hcl.com> >> wrote: >> >> Dear All, >> >> >> >> Thanks in advance for the help. >> >> >> >> We are facing an issue with Arabic characters when using Podofo library >> to draw it in PDF file. >> >> >> >> The characters are not joined together in the output pdf file. >> >> Below is the code that we have implemented to draw Arabic characters in >> PDF file. >> >> >> >> Attached the expected output and actual output snapshots. >> >> >> >> Kindly let us know whether any other settings needs to be enabled or >> should we use any other API. >> >> >> >> ... >> >> pFont = document->CreateFont("Arabic Typesetting", false, false, false, >> PdfEncodingFactory::GlobalIdentityEncodingInstance(), >> PoDoFo::PdfFontCache::eFontCreationFlags_None); >> >> painter.SetFont(pFont); >> >> ... >> >> wstring ar = L"ابناء الشيخ"; >> >> std::reverse(ar.begin(), ar.end()); >> >> PdfString str1( ar.c_str() ); >> >> PdfString pString = str1.ToUnicode(); >> >> >> >> painter.AddText(pString, pString.GetCharacterLength()); >> >> ... >> >> >> >> Below are our observations regarding this issue. >> >> 1. Value of “pString” in the below line contains individual characters of >> the Arabic string “ar”. >> >> >> >> “PdfString pString = str1.ToUnicode();” >> >> >> >> 2. When “pString” is passed to “AddText” api, the output string written >> to PDF document is not joined together. >> >> Kindly refer to the attached expected output and actual output >> screenshots. >> >> >> >> Regards, >> >> Anand. >> >> ::DISCLAIMER:: >> ------------------------------ >> >> The contents of this e-mail and any attachment(s) are confidential and >> intended for the named recipient(s) only. E-mail transmission is not >> guaranteed to be secure or error-free as information could be intercepted, >> corrupted, lost, destroyed, arrive late or incomplete, or may contain >> viruses in transmission. The e mail and its contents (with or without >> referred errors) shall therefore not attach any liability on the originator >> or HCL or its affiliates. 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Before >> opening any email and/or attachments, please check them for viruses and >> other defects. >> ------------------------------ >> >> _______________________________________________ >> Podofo-users mailing list >> Podofo-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/podofo-users >> <https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Fpodofo-users&data=02%7C01%7Cramasamy-a%40hcl.com%7C451e8dcbe7b14a7d067b08d76c3216ed%7C189de737c93a4f5a8b686f4ca9941912%7C0%7C0%7C637096834700270562&sdata=xHAvTQrV2lqrhRHYN7GVvRJAHDdYzoulnrjN%2BeP5f44%3D&reserved=0> >> >>
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