Re: [ft-devel] FreeType and Windows WingDing font...

[Werner LEMBERG]

> I have a font viewer that uses your freetype library.  It displays
> all Windows fonts correctly except the WebDings/Wingdings ones.

You don't tell us which FreeType version you are using...

>   FT_UInt index;
>   FT_ULong charcode = FT_Get_First_Char( g_FT_face,  );
>
>   while ( index != 0 )
>   {
> // [ do stuff here ]
>
> charcode = FT_Get_Next_Char( g_FT_face, charcode,  );
>  }
>
> .. which works on all fonts except the ones mentioned above.  On
> those, the first call fails immediately because face->charmap ==
> NULL

There was a recent change in the library, to exactly follow the
documentation: FreeType only selects Unicode as a default charmap.  If
a font doesn't provide one (as is the case for a Wingdings or WebDings
font, which provide a `symbol' charmap instead), you have to select the
charmap explicitly.  I guess this is your problem.

> In the end, for windows symbol fonts I did this, it seems to work:
> [...]

Well, this is suboptimal, of course :-)


Werner

___
Freetype-devel mailing list
Freetype-devel@nongnu.org
https://lists.nongnu.org/mailman/listinfo/freetype-devel

Re: [ft-devel] FreeType and Windows WingDing font...

[Cork, Ste]

In the end, for windows symbol fonts I did this, it seems to work:

const FT_ULong uGlyphLimit = ( m_FontRenderInfo.m_bDebugDrawFontOver64K ) ? 
0x10 : 0x1;
for ( FT_ULong uGlyph = 0; 
uGlyph < uGlyphLimit; uGlyph++ )
{
   FT_Error ftError = 
FT_Load_Char( g_FT_face, uGlyph, FT_LOAD_BITMAP_METRICS_ONLY );
  if ( !ftError )
  {
 // [do 
stuff ]
  }
   }
}

Even at over 1.1 million iterations when doing >64k mode, it still takes less 
than 1 second even in debug mode, so nice work on the libraries, gents ;-)

-Ste.

From: Cork, Ste
Sent: Thursday, February 1, 2018 3:57 PM
To: 'freetype-devel@nongnu.org' 
Subject: FreeType and Windows WingDing font...

I have a font viewer that uses your freetype library. It displays all Windows 
fonts correctly except the WebDings/Wingdings ones.

Your suggested iteration code is this:

FT_UInt index;
 FT_ULong charcode = FT_Get_First_Char( 
g_FT_face,  );
 while ( index != 0 )
 {
// [ do stuff here ]

charcode = FT_Get_Next_Char( 
g_FT_face, charcode,  );
 }

.. which works on all fonts except the ones mentioned above. On those, the 
first call fails immediately because face->charmap == NULL

  FT_Get_First_Char( FT_Face   face,
 FT_UInt  *agindex )
  {
FT_ULong  result = 0;
FT_UInt   gindex = 0;


/* only do something if we have a charmap, and we have glyphs at all */
if ( face && face->charmap && face->num_glyphs )
{
  gindex = FT_Get_Char_Index( face, 0 );
  if ( gindex == 0 )
result = FT_Get_Next_Char( face, 0,  );
}

if ( agindex )
  *agindex = gindex;

return result;
  }


... but in that same viewer, if I tell it to use the Wingdings font and display 
an ordinary string ( e.g. "Hello World" ) it works fine. So the chars are there 
when asked for, but your iteration code is failing. What gives?

i.e. normal view-string mode ( not view-font ) calls this:

   FT_Error m_FT_error = FT_Load_Char( g_FT_face, letterToLoad, 
FT_LOAD_RENDER );

.. which works on WingDings because if face->charmap doesn't exist you simply 
carry on...

  FT_Load_Char( FT_Face   face,
FT_ULong  char_code,
FT_Int32  load_flags )
  {
FT_UInt  glyph_index;


if ( !face )
  return FT_THROW( Invalid_Face_Handle );

glyph_index = (FT_UInt)char_code;
if ( face->charmap )
  glyph_index = FT_Get_Char_Index( face, char_code );

return FT_Load_Glyph( face, glyph_index, load_flags );
  }

... so how do I ask WingDings what glyphs are in the font if your recommended 
iteration loop doesn't work?

Regards,

Ste Cork
Tech Programmer
Raven Software

___
Freetype-devel mailing list
Freetype-devel@nongnu.org
https://lists.nongnu.org/mailman/listinfo/freetype-devel