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(enum font_property_index): New members FONT_DPI_INDEX,
FONT_SPACING_INDEX, FONT_AVGWIDTH_INDEX, FONT_NAME_INDEX,
FONT_FULLNAME_INDEX, FONT_FILE_INDEX, FONT_FORMAT_INDEX,
FONT_OBJECT_MAX.  Delete FONT_FRAME_INDEX.
(FONT_WEIGHT_NUMERIC, FONT_SLANT_NUMERIC, FONT_WIDTH_NUMERIC)
(FONT_WEIGHT_SYMBOLIC, FONT_SLANT_SYMBOLIC, FONT_WIDTH_SYMBOLIC)
(FONT_WEIGHT_FOR_FACE, FONT_SLANT_FOR_FACE, FONT_WIDTH_FOR_FACE)
(FONT_WEIGHT_NAME_NUMERIC, FONT_SLANT_NAME_NUMERIC)
(FONT_WIDTH_NAME_NUMERIC, FONT_SET_STYLE): New macros.
(struct font_spec, struct font_entity): New structs.
(FONT_ENCODING_NOT_DECIDED): Moved from fontset.h.
(struct font): Many members from old "struct font_info" moved to
here.  Members font and entity deleted.
(FONT_SPEC_P, FONT_ENTITY_P, FONT_OBJECT_P, FONTP): Modified for
the new font-related objects.
(CHECK_FONT_SPEC, CHECK_FONT_ENTITY, CHECK_FONT_OBJECT)
(CHECK_FONT_GET_OBJECT): Likewise.
(XFONT_SPEC, XFONT_ENTITY, XFONT_OBJECT, XSETFONT): New macros.
(PT_PER_INCH, POINT_TO_PIXEL, PIXEL_TO_POINT): Moved from font.h.
(struct font_driver): New members case_sensitive anc check.  Type
of the member list and open changed.
(enable_font_backend, font_symbolic_weight, font_symbolic_slant)
(font_symbolic_width, font_find_object, font_get_spec)
(font_set_lface_from_name): Delete extern.
(Fcopy_font_spec, Fmerge_font_spec, Ffont_family_list): New
EXFUNs.