Hi, I found a curiosity in LuaTeX's treatment of `y_displacement` in glyph nodes:
Take the following ConTeXt example: \usetypescript[pagella] \setupbodyfont[pagella,12pt] \starttext f\char776\char776\char776\char807\char807\char807\vrule \stoptext (See https://github.com/latex3/luaotfload/issues/134 for a more practical case where this leads to issues) Here the \vrule shows that the marks attached at the top get their y_displacement added to their height, while for the marks added at the bottom the additional depth is ignored. (The first \char807 is still covered by the rule because that is the natural height of this glyph) This is explicitly done in texnodes.c: For glyph_height, the displacement is always added. For glyph_depth, the displacement is only added if it is positive: scaled glyph_height(halfword p) { scaled w = char_height(font(p), character(p)) + y_displace(p); if (w < 0) w = 0; return w; } scaled glyph_depth(halfword p) { scaled w = char_depth(font(p), character(p)); if (y_displace(p) > 0) w = w - y_displace(p); if (w < 0) w = 0; return w; } This seems inconsistant. Is there a reason why this would be required or could it be changed to handle height and depth consistently? Best regards, Marcel _______________________________________________ dev-luatex mailing list dev-luatex@ntg.nl https://mailman.ntg.nl/mailman/listinfo/dev-luatex
