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Japanese text in vertical writing mode rendered with glyphs for horizontal writing

See original GitHub issue

Attach (recommended) or Link to PDF file here:

https://www.mofa.go.jp/mofaj/gaiko/treaty/pdfs/treaty159_4a.pdf (via https://www.mofa.go.jp/mofaj/gaiko/treaty/treaty159_4.html)

Configuration:

Web browser and its version: Firefox 80.0.1
Operating system and its version: Windows 10 Home (Version 10.0.19041 build 19041)
PDF.js version: 2.6.123
Is a browser extension: yes (built-in)

Steps to reproduce the problem: open the PDF and jump to page 2.

What is the expected behavior? (add screenshot)

What went wrong? (add screenshot)

Glyphs ー, ュ and 、 are in horizontal form. (cf. Requirements for Japanese Text Layout 3.1.1 Differences in Vertical and Horizontal Composition in Use of Punctuation Marks )

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension): n/a

Issue Analytics

State:
Created 3 years ago
Comments:7 (3 by maintainers)

Top GitHub Comments

1reaction

THausherrcommented, Sep 9, 2020

It’s also in page 1. The font is named “Ryumin-regular-Identity-H” and the encoding is “Identity-H”. I suspect that Adobe itself notices that this is vertical writing and then displays that glyph differently.

1 g
/GS2 gs
0 841 m
0 841 l
f
q
  1 i
  0 841 595 -841 re
  0 841 m
  W
  n
  0.06 840.96 594.96 -840.96 re
  W
  n
  BT
    /G1 1 Tf
    20 0 0 20 287.64 681.67 Tm
    0 0 0 1 k
    0 Tc
    0 Tw
    (\003\261) Tj
    0 -1 TD
    (\003\240) Tj
    T*
    (\003\314) Tj
    T*
    (\036\323) Tj      % this is 0x1ED3 = 7891d
    T*
    (\015\\) Tj
    T*
    (\010Q) Tj
    T*
    (\003t) Tj
    T*
    (\006\024) Tj
    T*
    (\003b) Tj
    T*
    (\003\224) Tj
    T*
    (\011\332) Tj
    T*
    (\016\377) Tj
  ET
Q

0reactions

yuis-icecommented, Jul 26, 2022

I have a similar problem. In my case I’m reading a study paper where mainly in horizontal format but sometimes vertical context with a graph. The problem is that when I search text in say Foxit it recognizes the text but in the pdf.js viewer view when I search text it doesn’t recognize the text but does recognize horizontal texts. So for instance I’m seeing the problem like when I search a word in Foxit it finds lets say 60 match results, but in pdf.js 55 match results, like that.

Simply, this is a crucial problem when I cannot miss a match when I query a search. Is this a same issue to OP’s?? let me know if it doesn’t I’ll open a new issue. Thanks.

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