Index: font.c
===================================================================
--- font.c	(nonexistent)
+++ font.c	(revision 29110)
@@ -0,0 +1,88 @@
+/*
+ *                            COPYRIGHT
+ *
+ *  pcb-rnd, interactive printed circuit board design
+ *  Copyright (C) 2020 Tibor 'Igor2' Palinkas
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ *  Contact:
+ *    Project page: http://repo.hu/projects/pcb-rnd
+ *    lead developer: http://repo.hu/projects/pcb-rnd/contact.html
+ *    mailing list: pcb-rnd (at) list.repo.hu (send "subscribe")
+ */
+
+#include "font_geo.c"
+
+typedef enum {
+	FSR_SUCCESS = 0,
+	FSR_INVALID_FONT_ID, /* fatal, no output generated: print error and abort parsing */
+	FSR_INVALID_GLYPH_ID /* non-fatal but sizes may be wrong: print error but do not abort */
+} font_size_res_t;
+
+/* Which glyph code to use for a glyph that is not in our arrays */
+#define UNKNOWN_GLYPH 32
+
+#define LINE_END \
+do { \
+	if (lw > tw) \
+		tw = lw; \
+	lw = 0; \
+	lines++; \
+} while(0)
+
+/* Calculate the nominal size of a potentially multi-line text object. Output:
+   - width is the width of the longest line
+   - height is the total net height from bottom to top (depends on number of lines)
+   - yoffs is the vertical offset because of the baseline (does not depend on number of lines)
+*/
+static font_size_res_t font_text_nominal_size(int font_id, const char *txt, pcb_coord_t *width, pcb_coord_t *height, pcb_coord_t *yoffs)
+{
+	const char *s;
+	double lw = 0; /* current line width */
+	double tw = 0; /* total width */
+	double *gw;
+	int lines = 0, bad_glyph = 0;
+
+	if (!PCB_MENTOR_FONT_ID_VALID(font_id))
+		return FSR_INVALID_FONT_ID;
+
+	gw = pcb_mentor_font_widths[font_id];
+	for(s = txt; *s != '\0'; s++) {
+		int code = *s;
+		if (*s == '\n') {
+			LINE_END;
+			continue;
+		}
+		if (!PCB_MENTOR_FONT_GLYPH_VALID(code)) {
+			bad_glyph = 1;
+			if (PCB_MENTOR_FONT_GLYPH_VALID(UNKNOWN_GLYPH))
+				lw += gw[UNKNOWN_GLYPH];
+		}
+		else
+			lw += gw[code];
+	}
+	LINE_END;
+
+	*width = PCB_MM_TO_COORD(tw);
+	*height = PCB_MM_TO_COORD((double)lines * (pcb_mentor_font_ymax[font_id] - pcb_mentor_font_ymin[font_id]));
+	*yoffs = pcb_mentor_font_ymin[font_id];
+
+	return bad_glyph ? FSR_INVALID_GLYPH_ID : FSR_SUCCESS;
+}
+
+
+#undef UNKNOWN_GLYPH
+#undef LINE_END
Index: read.c
===================================================================
--- read.c	(revision 29109)
+++ read.c	(revision 29110)
@@ -53,6 +53,8 @@
 
 #include "../src_plugins/lib_compat_help/pstk_help.h"
 
+#include "font.c"
+
 typedef struct node_s node_t;
 typedef struct hkp_tree_s hkp_tree_t;