[ft] Rotten Glyph !

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Hi,

I want to generate anti-aliased data.
while debugging... I saw function
err = gray_convert_glyph_inner( RAS_VAR );

returning error code 64 i.e. memory overflow ..
and finally giving output as "Rotten Glyph!".
I uesd various ttf files like arial.ttf, verdanab.ttf for range 0-255 and even gargi_1.7.ttf  for range 0x900 - 0x97f..
same problem occurs with all above ttf glyph data.

I used FT_Set_Char_Size(..) .. for glyph's dimension. (resolution 96).

Will you plz. help me,
What to do in such case and where might be the problem.

Thanx a lot for replying for my previous queries.

Regards
Govind