KOReader and Fonts

[Winkelschraube]

Hello KOReader readers.

I would like to learn something about font management in KOReader. For example, I would like to use "Vollkorn".

http://vollkorn-typeface.com/
http://vollkorn-typeface.com/downloa...korn-4-105.zip

in the TTF folder of the zip file are the following files:

Vollkorn-Black.ttf
Vollkorn-BlackItalic.ttf
Vollkorn-Bold.ttf
Vollkorn-BoldItalic.ttf
Vollkorn-ExtraBold.ttf
Vollkorn-ExtraBoldItalic.ttf
Vollkorn-Italic.ttf
Vollkorn-Medium.ttf
Vollkorn-MediumItalic.ttf
Vollkorn-Regular.ttf
Vollkorn-SemiBold.ttf
Vollkorn-SemiBoldItalic.ttf

I have created the folder /koreader/fonts/vollkorn. How do I name the files? Or should KOReader automatically recognize regular, bold, italic etc.?

https://github.com/koreader/koreader/wiki/Fonts

Does not answer the questiion

[elvvis]

They should be recognized if you copy them into the koreader/fonts directory without subdirectory.

[Winkelschraube]

They can also be in folders, does not matter. See also the readme.md in the /koreader/fonts folder.

The question is rather about the naming. If I copy all files into one folder superbold will be activated automatically. If I then select bold in KOReader, the font becomes a little bit thinner.

If I have only "Vollkorn-Regular.ttf" in the folder, the font is displayed normally.

[NiLuJe]

Substyles are not supported. Only the four standard ones are.

So, generally, you'll want Regular, Bold, Italic & BoldItalic.

You *might* be able to actually use a different "base" weight (i.e., Thin or Medium instead of Regular), but it *might* require mangling the metadata and/or filenames.

----

What currently happens is that CRe walks over your folder in inode order, finds the first 4 fonts in a matching family, tries to figure out which is which (and generally fails for !Regular base weights), and calls it a day.
Since, instead of 4 exact styles, you have a crapload of stuff in there, you get a "controlled" random result ^^.
Check your crash.log, it'll be spouting quite a few warnings about discarding fonts.

[NiLuJe]

Much nicer recap of my half-assed "you might be able to do that" answer, thanks to @poire-z:

https://github.com/koreader/koreader...ment-698520071

[Winkelschraube]

Thank you very much, and to poire-z of course!!!. I now only have four files in the folder /koreader/fonts/vollkorn:

Vollkorn-Bold.ttf
Vollkorn-BoldItalic.ttf
Vollkorn-Italic.ttf
Vollkorn-Regular.ttf

And it works. Did I get it right, the fonts are recognized by the "font weight metadata", or by the file order? And KOReader can only recognize the four, otherwise something unpredictable happens.

How works bold, italic... if only the "regular" file is there? Is it calculated by KOReader from regular and is it more accurate with the corresponding files?

[Incanus]

I've tried and checked many times: the only file needed is the -regular one.

KO Reader works out the bold, italic and bold+italic by itself.

Kind regards

Enviado desde mi SM-G950F mediante Tapatalk

[Winkelschraube]

Originally Posted by Incanus

I've tried and checked many times: the only file needed is the <font name>-regular one.

Lobo works out the bold, italic and bold+italic by itself.

Ok, how works this? Is this calculated from the "regular" by KOReader or is everything in the regular file? NiLuJe the KOReader master, what is happening here?

Originally Posted by Incanus

Enviado desde mi SM-G950F mediante Tapatalk

Written with my Computer.

[NiLuJe]

@Winkelschraube: I have no idea what @Icanus is trying to say.

The post from @poire-z I linked to, on the other hand, is *definitely* canonical.

[Incanus]

I put a <font name>-Regular.ttf file on the koreader/fonts/ directory.

After that, I restart KO Reader and it will show the <font name> font as an available font.

If I selected and if the text has them, KO Reader will properly display the different styles, using only the <font name>-Regular.ttf file.

Best regards

Enviado desde mi SM-P350 mediante Tapatalk

[NiLuJe]

Yes, that's synthesized Bold & Italic.

Which doesn't have much to do with what @Winkelschraube was asking .

[Winkelschraube]

But that is what I meant in my last question. (09-27-2020, 06:17 AM and 10-02-2020, 02:54 PM)

[NiLuJe]

Originally Posted by NiLuJe

Yes, that's synthesized Bold & Italic.

The font layout/rendering engine will compute those based on the Regular outlines. It's obviously not optimal, but it's better than nothing. Bold is obviously less problematic than Italic .

[Winkelschraube]

Is there a way to find out if the file "fontname-bold" is used or if the bold is calculated by "fontname-regular"?

[NiLuJe]

Check the logs, if it's not rejected, it's being used.