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Fix invalid memory access in `bsdf` rasterizer.

Anuj Verma requested to merge anujv/freetype:bsdf-fix-invalid-memory-access into master

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 the slot->buffer might be assigned to some invalid memory location.

  • src/sdf/ftsdfrend.c (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

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