(XCharStruct): Remove member `valid_p'.
(STORE_XCHARSTRUCT): Don't set member `valid_p'. (XCharStructRow): New typedef. (XCHARSTRUCTROW_CHAR_VALID_P, XCHARSTRUCTROW_SET_CHAR_VALID): New macros. (struct MacFontStruct): Add member `bounds'. Remove member `per_char'. All uses for QuichDraw Text fonts are changed to `bounds.per_char'. ATSUI font bounds are represented as an array `bounds.rows' of XCharStructRow's, each of which consists of a bitmap of valid entries and an array of char bounds.
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