(Quniscribe, QCformat): New symbols.
(syms_of_w32font): Define them. (w32font_has_char): Indicate uncertainty. (w32font_encode_char): Encode as glyph point. Make static. (recompute_cached_metrics): New function. (w32font_open_internal): Use it. Set font to use glyph points initially. Set format based on type of font. (w32font_text_extents, w32font_draw): Optionally use glyph points. (w32_enumfont_pattern_entity): Accept backend arg. Set type based on it. Set format based on information available here. (add_font_entity_to_list): Identify backend based on opentype_only.
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