Issue with Thai Characters Rendering in PDF

Sangeetha Pandian

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Feb 9, 2024, 8:01:46 AM2/9/24

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Hi everyone,

I'm facing an issue with rendering Thai characters (specifically ที่, นั้, นั่) properly in PDF files. I have tried using various fonts such as Mai tree, Noto Serif, Chonburi and Sarabun, but unfortunately, I have not found a solution yet.

The characters appear distorted or incorrectly rendered in the generated PDF files. I have ensured that the fonts I am using support the Thai language, but the problem persists.

If anyone has encountered a similar issue or has any suggestions for resolving this problem, I would greatly appreciate your insights and assistance.

Thank you!

Sangeetha Pandian

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Feb 9, 2024, 8:53:16 AM2/9/24

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Andrei Solntsev

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Feb 9, 2024, 10:14:41 AM2/9/24

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Hi Sangeetha!

It's impossible to say anything useful without seeing your code.

Show the code: how exactly are you running FlyingSaucers? How are you adding the fonts?

P.S. Recently we already had a problem with CJK fonts, may be yours is similar?

https://github.com/flyingsaucerproject/flyingsaucer/issues/251

Andrei Solntsev

пт, 9 февр. 2024 г. в 15:01, Sangeetha Pandian <sangeeth...@gmail.com>:

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Sangeetha Pandian

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Feb 9, 2024, 10:34:51 AM2/9/24

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Thanks,
I checked the issue that you faced and I already using Identity-H encoding

Here is the code

String htmlContent = "<html><body><h1>ที่ ,นั้ น, นั่ น</h1></body></html>";

OutputStream pdf = Files.newOutputStream(Paths.get("output/thai.pdf"))

ITextRenderer renderer = new ITextRenderer();

SharedContext sharedContext = renderer.getSharedContext();
String font = "/fonts/Maitree-Regular.ttf";
renderer.getFontResolver().addFont(font, BaseFont.IDENTITY_H, true);
renderer.setDocumentFromString(htmlContent);
renderer.layout();
renderer.createPDF(pdf);

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Peter Brant

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Feb 9, 2024, 5:55:45 PM2/9/24

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I don't know if this applies to Thai specifically, but support for fonts (languages) that use mandatory ligatures, combining characters, etc. is basically non-existent.

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