Re: [ft] How to determine which Unicode blocks a True Type font supports?

[suzuki toshiya]

Hi,

In de-jure standard, OS/2 table has similar info in UnicodeRange
entries (see tttables.h) about the per-block availability. However,
in real world, they are not so reliable. Per-codepoint checking
is required if you want reliable info.

I don't know whether Win32 or C# provide some useful API to do
that (I'm not saying as there would not be - I just say I don't
know).

If you want to self-standing tool doing such, please check fontconfig
source. I'm not recommending to use fontconfig in your software project
(it might be overkill library for Windows application), but you will
find how it checks the glyph availability. It might be one of the
most popular implementation crawling all codepoints and glyph availability.

Regards,
mpsuzuki

DK wrote:
> Is there a way using FreeType on Windows to determine:
> 
> 1.       Which Unicode blocks (as per http://unicode.org/ V8.0.0) the font
> supports?
> 
> 2.       In the blocks it supports, how many of the characters are
> supported?
> 
>  
> 
> For example, TrueType font Symbola all 48 characters of Unicode block
> "Miscellaneous Mathematical Symbols-A" (U+27C0 - U+27EF), all 116 characters
> in the Unicode block "Alchemical symbols" (U+1F700 - U+1F77F) but only 4
> characters of Unicode block "Latin Extended-E" (U+AB30 - U+AB65).
> 
>  
> 
> Note: Windows works with surrogates and not the Unicode integer value for
> characters above 0xFFFF (i.e. not in the BMP).
> 
>  
> 
> I assume one has to process the cmap table but this does not seem as easy as
> I had hoped.  It doesn't help that the cmap seems to be big endian and
> Windows is little endian!
> 
>  
> 
> Many thanks.
> 
> 
> 
> 
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