Re: [Freetype] display Kanji

[David Turner]

Hello Achim,

Achim Mueller wrote:
> Hi,
>
> I want to display Text in Kanji. But since the symbols are split into 13
> TTF files KANJIA.TTF to KANJIL.TTF I want to create a lookup table which
> symbol is in which file. The idea was to iterate with Get_First_Char and
> Get_Next_Char  over the charmaps to create this unified mapping table.
> My problem is now, that this works well with e.g. VERDANA.TTF but not
> with the required KANJI fonts. 
>
> mvError = FT_Init_FreeType( &mLibrary );
> if ( mvError ) {return FAILED;}
> mvError = FT_New_Memory_Face( mLibrary, 
> 	( const FT_Byte * ) data.cchrptr(), 
> 	data.length(), 0, &mFace );
> if ( mvError ) {return FAILED;}
> //FT_Select_Charmap( mFace, FT_ENCODING_MS_SJIS );
> //FT_Select_Charmap( mFace, FT_ENCODING_UNICODE );
> //FT_Select_Charmap( mFace, FT_ENCODING_MS_BIG5 );
>
> FT_UInt FirstGlyphCode;
> FT_ULong FirstCharCode = FT_Get_First_Char( mFace, &FirstGlyphCode );
> cout << FirstCharCode << ",\t";
> while ( FirstGlyphCode != 0 )
> {                                                                
> 	FirstCharCode = FT_Get_Next_Char( mFace, 
> 		FirstCharCode, &FirstGlyphCode );        
> 	cout << FirstCharCode << ",\t";
> };
>
> With the KANJI fonts or even the simple 1-file KANA.TTF font the
> iterator returns always 0. And a brute force lookup does it either.
>
> FT_UInt gi = FT_Get_Char_Index( mFace, 0x4ee0 );
> cout << "char 0x4ee0 -> glyph: " << gi << "\n";
That's not very surprising, "ftdump" shows that KANA.TTF
doesn't have any Unicode charmap, in such cases, FreeType's
behaviour is perfectly normal.

By the way, these are the 2 charmaps in the font:

  (1,0)  ( Macintosh, Roman )  (probably useless)
  (3,0)  ( Windows, Symbol )

I don't know how to convert from Symbol to Unicode, or the other
way around, but I suppose that your other fonts exhibit the same
problem..

You should try to select the FT_ENCODING_MS_SYMBOL charmap and
parse it to see how it is organized..

Regards,

- David Turner
- The FreeType Project  (www.freetype.org)