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  • Hash : ebcc96e5
    Author : Anuj Verma
    Date : 2021-08-02T08:40:43

    Fix invalid memory access in `bsdf` rasterizer.
    
    Do not generate SDF from bitmap if the `FT_GLYPH_OWN_BITMAP` flag is not
    set.  In some cases the bitmap buffer is freed but still points to a valid
    address; to handle those cases check the flag before accessing the memory.
    
    * src/sdf/ftsdfrend.c (ft_bsdf_render): Handle the above case.
    Also, return an error message if the bitmap's rows/pitch is invalid,
    otherwise `slot->buffer` might be assigned to some invalid memory location.
    (ft_sdf_render): Same as above.
    Plus, move the outline back to original state after rasterization and not if
    any error occurs.
    
    Signed-off-by: Anuj Verma <anujv@iitbhilai.ac.in>