Question regarding bidirectional algorithm

[David Tooke]

The bidirectional algorithm mentions mirrored glyphs.   The reference code handles them by replacing these characters with their mirror image.   Is this the preferred method of doing this?  If so, is there any where in the Unicode database that correlates the two characters?   Otherwise, do I render just render the glyph in reverse, flipping the glyph along the horizontal axis?   Wouldn't this screw up italicised characters?     Thanks,   David Tooke [EMAIL PROTECTED]