(x_append_glyph): Setup members of struct glyph properly
for composition. (x_append_composite_glyph): New function. (VCENTER_BASELINE_OFFSET): New macro. (x_produce_glyphs): If it->what == IT_COMPOSITION, setup members of struct it for the composition. Cache pixel offsets in the struct composition. Delete codes for a composite character. Handle Vignore_relative_composition in composition code. (struct glyph_string): Delete member cmpcharp, add new member cmp. (x_set_cursor_gc): Check s->cmp, not s->cmpcharp. (x_compute_glyph_string_overhangs): Likewise. (x_get_glyph_overhangs): Delete codes for a composite character. (x_right_overwritten): Check s->cmp, not s->cmpcharp. (x_draw_glyph_string_background): Likewise. Delete codes for checking s->gidx for a composition. (x_draw_glyph_string_foreground): Delete code for a composite character. (x_draw_composite_glyph_string_foreground): New function. (x_draw_glyph_string_box): Check s->cmp, not s->cmpcharp. (x_draw_glyph_string): Handle the case of COMPOSITE_GLYPH. (struct work): Deleted. (x_fill_composite_glyph_string): Argument changed. Mostly rewritten for that. (x_fill_glyph_string): Don't check CHARSET_COMPOSITION. (BUILD_CHAR_GLYPH_STRINGS): Don't handle composition here. (BUILD_COMPOSITE_GLYPH_STRING): New macro. (BUILD_GLYPH_STRINGS): For composition, call BUILD_COMPOSITE_GLYPH_STRING. (x_new_font): Initialize f->output_data.x->baseline_offset, not f->output_data.x->font_baseline.
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