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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