Re: [Devel] cmap in webdings

[Dirck Blaskey]

Missing some important parens in the patch, this is better:
736,753d735
< 
<     /* [[ 2002.5.20 for webdings.tt embedded in a pdf file
<        the table doesn't cover the glyphs we want, 
<        but the information is there.  
<        if RangeOffset == 0 assuming endCount is next StartCount - 1
< 
<        the last_segment optimization above won't catch this
<     */
<     limit--;
<     for ( seg4 = cmap4->segments; seg4 <= limit; seg4++ )
<     {
<       if ( seg4->idRangeOffset == 0 &&
<            charCode >= (FT_UInt)seg4->startCount && 
<           (seg4 == limit || charCode < seg4[1].startCount) )
<         goto Found;
<     }
<     /* ]] */
< 

----- Original Message ----- 
From: "Dirck Blaskey" <address@hidden>
To: "FreeType Development" <address@hidden>
Sent: Monday, May 20, 2002 3:18 PM
Subject: [Devel] cmap in webdings


> I have a pdf file with an embedded True Type font, webdings,
> that has some oddities with its cmap, so FT_Get_Char_Index
> wasn't working.
> 
> The cmap doesn't explicitly cover the character ranges, 
> most of the entries have startCount == endCount.
> 
> Here is a patch to Freetype 2.0.9 sfnt/ttcmap.c;
> The patch should work with the current development snapshot.
> 
> In theory, there might be a problem with the patch,
> when looking for characters that _really_ aren't there.  
> Maybe an additional check for startCount == endCount?
> Is there any safe way to be sure?
> 
> A better fix might be to do some doctoring after the load;
> the 'length' value from the dump looks right, maybe
> that can be used to validate the fixups at load time.
> 
> The patch goes just above the:
>     
>     return 0;
> 
>   Found:
> 
> in code_to_index4().
> 
> Here's the patch:
> 
> 735a736,753
> > 
> >     /* [[ 2002.5.20 for webdings.tt embedded in a pdf file
> >        the table doesn't cover the glyphs we want, 
> >        but the information is there.  
> >        if RangeOffset == 0 assuming endCount is next StartCount - 1
> > 
> >        the last_segment optimization above won't catch this
> >     */
> >     limit--;
> >     for ( seg4 = cmap4->segments; seg4 <= limit; seg4++ )
> >     {
> >       if ( seg4->idRangeOffset == 0 &&
> >            charCode >= (FT_UInt)seg4->startCount && 
> >            seg4 == limit || charCode < seg4[1].startCount )
> >         goto Found;
> >     }
> >     /* ]] */
> > 
> 
> Here's the cmap dump from the font:
> Subtable  1.   Platform ID:   0
>                Specific ID:   3
>                'cmap' Offset: 0x0000024A
>        ->Format: 4 : Segment mapping to delta values
>   Length:  100
>   Version: 0
>   segCount: 9  (X2 = 18)
>   searchRange: 16
>   entrySelector: 3
>   rangeShift: 2
>   Seg   1 : St = 0009, En = 000A, D =      0, RO =    18, gId# = 0
>   Seg   2 : St = 000C, En = 000D, D =      0, RO =    20, gId# = 2
>   Seg   3 : St = 0020, En = 0020, D =    -29, RO =     0, gId# = N/A
>   Seg   4 : St = 002F, En = 002F, D =    -29, RO =     0, gId# = N/A
>   Seg   5 : St = 005C, En = 005C, D =    -29, RO =     0, gId# = N/A
>   Seg   6 : St = 007C, En = 007C, D =    -29, RO =     0, gId# = N/A
>   Seg   7 : St = 2028, En = 2029, D =      0, RO =    14, gId# = 4
>   Seg   8 : St = 21B8, En = 21B8, D =  -8589, RO =     0, gId# = N/A
>   Seg   9 : St = FFFF, En = FFFF, D =      1, RO =     0, gId# = N/A
>   glyphIdArray[0] =    3 (Offset = 0058)
>   glyphIdArray[1] =    3 (Offset = 005A)
>   glyphIdArray[2] =    3 (Offset = 005C)
>   glyphIdArray[3] =    3 (Offset = 005E)
>   glyphIdArray[4] =    3 (Offset = 0060)
>   glyphIdArray[5] =    3 (Offset = 0062)
> 
>   Which Means:
>      1. Char 0009 -> Index 3
>         Char 000A -> Index 3
>      2. Char 000C -> Index 3
>         Char 000D -> Index 3
>      3. Char 0020 -> Index 3
>      4. Char 002F -> Index 18
>      5. Char 005C -> Index 63
>      6. Char 007C -> Index 95
>      7. Char 2028 -> Index 3
>         Char 2029 -> Index 3
>      8. Char 21B8 -> Index 43
> 
> 
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