I found that FreeType can not get the correct glyph index from the font
“Simsun-extb” corroding the Unicode of the character.
In the TTF, the cmap table use the format 12, and I always get 0, from the
function FT_Get_Char_Index(), I think it maybe a bug to deal with the cmap
which is format 12.
We can see that the Unicode is no in the range seg 2(00020000 - 0002A6D6), so
there must be some error in the function tt_cmap12_char_map_binary() in
“src\sfnt\ttcmap.c”.
This is a segment of the cmap in the font:
Subtable 3. Platform ID: 3
Specific ID: 10
'cmap' Offset: 0x00000142
->Format: 12 : Segmented coverage (32 bit)
Length: 40
Version: 0
Seg 1 : startCharCode = 00000020, endCharCode = 0000007F,
startGlyphCode = 2
Seg 2 : startCharCode = 00020000, endCharCode = 0002A6D6,
startGlyphCode = 98
Which Means:
1. Char 00000020 -> Index 2
Char 00000021 -> Index 3
Char 00000022 -> Index 4
……………………………………
………………………………
Thanks.
Regards,
2007-09-24
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