RE: [Devel] Mac language ID

[Turner David]

Hi,

What about an API like the following instead::

  FT_Get_CMap_Language_ID( cmap ) => language_ID, 0 by default

it would be simpler to use than through a TT_CMapInfo, since
we cannot extend public structures that are used as output
parameters unless we want to break binary compatibility.

Regards,

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

> -----Original Message-----
> From: address@hidden [mailto:address@hidden
> Behalf Of Masatake YAMATO
> Sent: Tuesday, December 16, 2003 11:16 AM
> To: address@hidden; address@hidden
> Cc: address@hidden
> Subject: Re: [Devel] Mac language ID
> 
> 
> > > If we are not permitted to add language_id field to FT_CharMapRec_
> > > because the addition breaks binary compatibility (or for 
> some other
> > > reason), we have to add the language_id to TT_CMap.
> > > 
> > >   typedef struct  TT_CMapRec_
> > >   {
> > >     FT_CMapRec  cmap;
> > >     /* here */
> > >     FT_Byte*    data;         /* pointer to in-memory 
> cmap table */
> > >   } TT_CMapRec, *TT_CMap;
> > > 
> > > In this case we have to consider about the filed accessor because
> > > the TT_CMapRec is sfnt private.
> > 
> > Perhaps an equivalent to the the fttype1.c file; something like an
> > `FT_Get_TT_CMap_Info' function.  This would be a candidate for a
> > Freetype service since the cff and type 42 drivers are affected
> > also...
> 
> I've implemented. I added one type and one function to the 
> public interface.
> 
>   
> /*************************************************************
> ************/
>   /*                                                          
>              */
>   /* <Struct>                                                 
>              */
>   /*    TT_CMapInfo                                           
>              */
>   /*                                                          
>              */
>   /* <Description>                                            
>              */
>   /*    A structure used to store truetype/sfnt specific cmap 
> information  */
>   /*    which is not covered by generic FT_CharMap structure. 
> This         */
>   /*    structure can be accessed with FT_Get_TT_CMap_Info 
> function.       */
>   /*                                                          
>              */
>   /* <Fields>                                                 
>              */
>   /*    language               :: language ID used in Mac 
> fonts.           */
>   /*                              Definitions of values are 
> in             */
>   /*                              freetype/ttnameid.h.        
>              */
>   /*                                                          
>              */
>   typedef struct  TT_CMapInfo_
>   {
>     FT_ULong language;
>   } TT_CMapInfo;
> 
>   
> /*************************************************************
> ************/
>   /*                                                          
>              */
>   /* <Function>                                               
>              */
>   /*    FT_Get_TT_CMap_Info                                   
>              */
>   /*                                                          
>              */
>   /* <Description>                                            
>              */
>   /*    Get truetype/sfnt specific cmap information for given 
> charmap.     */
>   /*                                                          
>              */
>   /* <Input>                                                  
>              */
>   /*    charmap :: target charmap.                            
>              */
>   /*                                                          
>              */
>   /* <Output>                                                 
>              */
>   /*    cmap_info :: truetype/sfnt specific cmap information. 
>              */
>   /*                                                          
>              */
>   /* <Return>                                                 
>              */
>   /*    FreeType errror code. 0 means success.                
>              */
>   /*                                                          
>              */
>   FT_EXPORT( FT_Error )
>   FT_Get_TT_CMap_Info( FT_CharMap   charmap,
>                      TT_CMapInfo  *cmap_info );
> 
> 
> I've added language field to the private data structure.
> 
>   typedef struct  TT_CMapRec_
>   {
>     FT_CMapRec  cmap;
>     FT_Byte*    data;           /* pointer to in-memory cmap table */
>     FT_ULong    language;     /* Used in Mac platform */
> 
>   } TT_CMapRec, *TT_CMap;
> 
> We can do the same thing with language field(`data' field 
> holds the language data). 
> I should provide a function which extracts language field 
> from data instead of
> providing language field which is set by TT_CMap initialize 
> phase. Give me comments.
> 
> language.c is for the test. Compile with patched freetype2 
> and run with font files.
> language.patch is the patch.
> 
> Regards,
> Masatake YAMATO
> 

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