From b0cbe870b3fc3a118784d51a1a7efb3a49dbf094 Mon Sep 17 00:00:00 2001
From: Ben Harris <bjh21@bjh21.me.uk>
Date: Sat, 2 Nov 2024 16:35:34 +0000
Subject: [PATCH] Generate 'cmap' table for TTX

TTX currently refuses to compile it, but I suspect that's because the
font still has no glyphs.
---
 bedstead.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/bedstead.c b/bedstead.c
index 632e363..fee42d8 100644
--- a/bedstead.c
+++ b/bedstead.c
@@ -198,6 +198,7 @@ static void domosaic(unsigned code, bool sep);
 static void domosaic4(unsigned code, bool sep);
 static void doalias(char const *alias_of);
 static void dopanose(void);
+static void docmap(int pid, int eid, int format);
 static void glyph_complement(void);
 static void bdf_gen(int size);
 
@@ -2993,6 +2994,13 @@ main(int argc, char **argv)
 	NAME(0x114, "4-cell separated graphics");
 	NAME(0x116, "6-cell separated graphics");
 	printf(" </name>\n");
+
+	printf(" <cmap>\n");
+	docmap(0, 3, 4);   /* Unicode 2.0+, BMP only */
+	docmap(0, 4, 12);  /* Unicode 2.0+, full repertoire */
+	docmap(3, 1, 4);   /* Windows Unicode, BMP only */
+	docmap(3, 10, 12); /* Windows Unicode, full repertoire */
+	printf(" </cmap>\n");
 	/* printf("FontName: %s\n", fullname_to_fontname(get_fullname())); */
 	/* printf("FullName: %s\n", get_fullname()); */
 	/* printf("FamilyName: Bedstead\n"); */
@@ -3249,6 +3257,28 @@ dopanose(void)
 	       panose[5], panose[6], panose[7], panose[8], panose[9]);
 }
 
+static void
+docmap(int pid, int eid, int format)
+{
+	int i;
+	long limit = 0x10000;
+
+	printf("  <cmap_format_%d platformID='%d' platEncID='%d' language='0'",
+	       format, pid, eid);
+	if (format == 12) {
+		limit = 0x110000;
+		/* TTX will recalculate these, but insists we give them. */
+		printf(" format='12' reserved='0' length='0' nGroups='0'");
+	}
+	printf(">\n");
+	for (i = 0; i < nglyphs; i++)
+		if (glyphs[i].unicode >= 0 &&
+		    glyphs[i].unicode < limit)
+			printf("    <map code='0x%lx' name='%s'/>\n",
+			       (long)glyphs[i].unicode, glyphs[i].name);
+	printf("  </cmap_format_%d>\n", format);
+}
+
 static void
 dopalt(struct glyph const *g)
 {
-- 
2.30.2