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Typesetting Engines: A Programmer's Perspective

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Re: Typesetting Engines: A Programmer's Perspective

#3

Post by rikroots »

The most painful issues I encountered when building out a text layout engine for my JS 2D canvas library were:

- Vertical text - in particular when it comes to how CJK punctuation differs in horizontal and vertical environments (not yet solved)

- Staying on CJK, making sure the punctuation marks that follow a character don't break and remain with their preceding characters at all times. (I expect the same holds for opening quotes etc but haven't experimented).

- Highly ligatured fonts - Devangari, Arabic, etc - there's no solution to styling individual characters within a word that I could find.

- Talking of styling ... underlining text is a nightmare - especially if you want to get the little gap between hanging characters and the underline that HTML/CSS browsers do out of the box

- Formatting Thai fonts ... is another World of Hurt[1]

[1] - https://w3c.github.io/sealreq/thai/

Re: Typesetting Engines: A Programmer's Perspective

#6

Post by fithisux »

AlbertoGP wrote: post #4
fithisux wrote: post #2

sile is missing

It is mentioned in passing though, with a link to its website: > It is widely adopted by various typesetting engines like TeX, SILE[1] and Typst, etc. > [1] https://sile-typesetter.org/

I stay corrected then.

Re: Typesetting Engines: A Programmer's Perspective

#7

Post by invalidname »

rikroots wrote: post #3

The most painful issues I encountered when building out a text layout engine for my JS 2D canvas library were: - Vertical text - in particular when it comes to how CJK punctuation differs in horizontal and vertical environments (not yet solved) - Staying on CJK, making sure the punctuation marks that follow a character don't break and remain with their preceding characters at all times. (I expect the same holds for o…

No bidi or Arabic script complexities? Calculating the line break in an RTL situation is just terrible...
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