Re: Problems building the unifont PFA and DIT files for the PDF book

[Alejandro Colomar <alx@kernel.org>]

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Hi Brian,

On Sat, Apr 20, 2024 at 02:11:55PM -0600, Brian Inglis wrote:
> On 2024-04-20 09:52, G. Branden Robinson wrote:
> > At 2024-04-20T14:26:17+0200, Alejandro Colomar wrote:
> > > First problem:
> > > 
> > > In the Unifont, I don't see a "Regular" font.  I assumed I should take
> > > the unifont.otf file.
> 
> Hi folks,
> 
> That's the BMP ~63.5k characters ~57k glyphs; unifont_upper are the SMP
> ~57.5k glyphs with specialized scripts and extended graphics like emojis:
> unlikely to be required for any LGC man pages.
> 
> 		https://unifoundry.com/unifont/index.html

Thanks!

> > Since (I believe I saw you say that) you're using GNU Unifont only to
> > patch up missing code point coverage from other fonts, in your
> > application it probably makes sense to specify it as a "special" font.
> > 

[...]

> OpenType fonts are normally designed with an 1000 units/em, and Truetype may
> be 1024 or 2048 units/em, so should use 333 or maybe 300 if you prefer a
> tighter look, close to your suggestion.
> 
> $ ttfdump /usr/share/fonts/urw-base35/NimbusRoman-Regular.otf | awk "/'head'/,/^$/"
>    6. 'head' - checksum = 0x0cdb53f2, offset = 0x00016f4c, len =        54
>    7. 'hhea' - checksum = 0x06b6057b, offset = 0x00016f84, len =        36
>    8. 'hmtx' - checksum = 0x35d9ae6c, offset = 0x00016fa8, len =      3420
>    9. 'maxp' - checksum = 0x03575000, offset = 0x00017d04, len =         6
>   10. 'name' - checksum = 0x8993f63c, offset = 0x00017d0c, len =       620
>   11. 'post' - checksum = 0xffb10032, offset = 0x00017f78, len =        32
> 
> 'head' Table - Font Header
> --------------------------
>          'head' version:         1.0
>          fontReversion:          1.0
>          checkSumAdjustment:     0x69d6e98e
>          magicNumber:            0x5f0f3cf5
>          flags:                  0x0003
>          unitsPerEm:             1000
>          created:                0x00000000d5420807
>          modified:               0x00000000d5420807
>          xMin:                   -168
>          yMin:                   -281
>          xMax:                   1000
>          yMax:                   1053
>          macStyle bits:          0x0000
>          lowestRecPPEM:          3
>          fontDirectionHint:      2
>          indexToLocFormat:       0
>          glyphDataFormat:        0
> 
> For comparison Tinos ttf substitute for Times Roman:
> 
> $ ttfdump /usr/share/fonts/tinos/Tinos-Regular.ttf | awk "/'head'/,/^$/"
>   12. 'head' - checksum = 0x0bd978fc, offset = 0x0000015c, len =        54
>   13. 'hhea' - checksum = 0x19811ca6, offset = 0x00000194, len =        36
>   14. 'hmtx' - checksum = 0xa4bce0e7, offset = 0x00000238, len =     13116
>   15. 'kern' - checksum = 0xa39da9f5, offset = 0x0008d6f8, len =      5220
>   16. 'loca' - checksum = 0x28e2bf88, offset = 0x0001a45c, len =     13120
>   17. 'maxp' - checksum = 0x10d405bc, offset = 0x000001b8, len =        32
>   18. 'name' - checksum = 0xc3ff0ad5, offset = 0x0008eb5c, len =      2052
>   19. 'post' - checksum = 0xe841b7c5, offset = 0x0008f360, len =     34664
>   20. 'prep' - checksum = 0xbd48485c, offset = 0x00019b40, len =      1550
> 
> 'head' Table - Font Header
> --------------------------
>          'head' version:         1.0
>          fontReversion:          1.20736
>          checkSumAdjustment:     0x84b246c2
>          magicNumber:            0x5f0f3cf5
>          flags:                  0x001b
>          unitsPerEm:             2048
>          created:                0x00000000c844d0ce
>          modified:               0x00000000d25f0c4c
>          xMin:                   -1114
>          yMin:                   -797
>          xMax:                   5728
>          yMax:                   2068
>          macStyle bits:          0x0000
>          lowestRecPPEM:          9
>          fontDirectionHint:      2
>          indexToLocFormat:       1
>          glyphDataFormat:        0
> 
> > [1] I do observe that the URW font descriptions shipped by groff include
> >      a special character called "space".  Syntactically, this would be
> >      accessed within a groff document via a special character escape
> >      sequence: `\[space]`.  I've never seen a document do this.  I admit
> >      that I don't have any idea why this is present or what its semantics
> >      are: I need a PostScript or PDF expert to tell me.[2]  It does occur
> >      to me that we might enhance afmtodit make of use of it as the
> >      default "spacewidth".
> > 
> > [2] Or I can self-help; I have copies of the _PostScript Language
> >      Reference Manual_ (3rd ed.) and a version of ISO 32000 lying around.
> 
> But Unifont uses 64 units/em, so 20-21?

Thanks!!!

I've tried to build the Chinese man-pages book for shadow, but I still
don't get Chinese letters, so I wasn't able to test this value, but I'll
try debugging it in the following days.

Anyway, I've applied this value in a commit that I'll push tomorrow to
the Linux man-pages' master branch.

Have a lovely night!
Alex

-- 
<https://www.alejandro-colomar.es/>

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