--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/source/pdf/pdf-metrics.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,166 @@
+// Copyright (C) 2004-2021 Artifex Software, Inc.
+//
+// This file is part of MuPDF.
+//
+// MuPDF is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Affero General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// MuPDF 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 Affero General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
+//
+// Alternative licensing terms are available from the licensor.
+// For commercial licensing, see <https://www.artifex.com/> or contact
+// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
+// CA 94129, USA, for further information.
+
+#include "mupdf/fitz.h"
+#include "mupdf/pdf.h"
+
+#include <stdlib.h>
+
+void
+pdf_set_font_wmode(fz_context *ctx, pdf_font_desc *font, int wmode)
+{
+	font->wmode = wmode;
+}
+
+void
+pdf_set_default_hmtx(fz_context *ctx, pdf_font_desc *font, int w)
+{
+	font->dhmtx.w = w;
+}
+
+void
+pdf_set_default_vmtx(fz_context *ctx, pdf_font_desc *font, int y, int w)
+{
+	font->dvmtx.y = y;
+	font->dvmtx.w = w;
+}
+
+void
+pdf_add_hmtx(fz_context *ctx, pdf_font_desc *font, int lo, int hi, int w)
+{
+	if (font->hmtx_len + 1 >= font->hmtx_cap)
+	{
+		int new_cap = font->hmtx_cap + 16;
+		font->hmtx = fz_realloc_array(ctx, font->hmtx, new_cap, pdf_hmtx);
+		font->hmtx_cap = new_cap;
+	}
+
+	font->hmtx[font->hmtx_len].lo = lo;
+	font->hmtx[font->hmtx_len].hi = hi;
+	font->hmtx[font->hmtx_len].w = w;
+	font->hmtx_len++;
+}
+
+void
+pdf_add_vmtx(fz_context *ctx, pdf_font_desc *font, int lo, int hi, int x, int y, int w)
+{
+	if (font->vmtx_len + 1 >= font->vmtx_cap)
+	{
+		int new_cap = font->vmtx_cap + 16;
+		font->vmtx = fz_realloc_array(ctx, font->vmtx, new_cap, pdf_vmtx);
+		font->vmtx_cap = new_cap;
+	}
+
+	font->vmtx[font->vmtx_len].lo = lo;
+	font->vmtx[font->vmtx_len].hi = hi;
+	font->vmtx[font->vmtx_len].x = x;
+	font->vmtx[font->vmtx_len].y = y;
+	font->vmtx[font->vmtx_len].w = w;
+	font->vmtx_len++;
+}
+
+static int cmph(const void *a0, const void *b0)
+{
+	pdf_hmtx *a = (pdf_hmtx*)a0;
+	pdf_hmtx *b = (pdf_hmtx*)b0;
+	return a->lo - b->lo;
+}
+
+static int cmpv(const void *a0, const void *b0)
+{
+	pdf_vmtx *a = (pdf_vmtx*)a0;
+	pdf_vmtx *b = (pdf_vmtx*)b0;
+	return a->lo - b->lo;
+}
+
+void
+pdf_end_hmtx(fz_context *ctx, pdf_font_desc *font)
+{
+	if (!font->hmtx)
+		return;
+	qsort(font->hmtx, font->hmtx_len, sizeof(pdf_hmtx), cmph);
+	font->size += font->hmtx_cap * sizeof(pdf_hmtx);
+}
+
+void
+pdf_end_vmtx(fz_context *ctx, pdf_font_desc *font)
+{
+	if (!font->vmtx)
+		return;
+	qsort(font->vmtx, font->vmtx_len, sizeof(pdf_vmtx), cmpv);
+	font->size += font->vmtx_cap * sizeof(pdf_vmtx);
+}
+
+pdf_hmtx
+pdf_lookup_hmtx(fz_context *ctx, pdf_font_desc *font, int cid)
+{
+	int l = 0;
+	int r = font->hmtx_len - 1;
+	int m;
+
+	if (!font->hmtx)
+		goto notfound;
+
+	while (l <= r)
+	{
+		m = (l + r) >> 1;
+		if (cid < font->hmtx[m].lo)
+			r = m - 1;
+		else if (cid > font->hmtx[m].hi)
+			l = m + 1;
+		else
+			return font->hmtx[m];
+	}
+
+notfound:
+	return font->dhmtx;
+}
+
+pdf_vmtx
+pdf_lookup_vmtx(fz_context *ctx, pdf_font_desc *font, int cid)
+{
+	pdf_hmtx h;
+	pdf_vmtx v;
+	int l = 0;
+	int r = font->vmtx_len - 1;
+	int m;
+
+	if (!font->vmtx)
+		goto notfound;
+
+	while (l <= r)
+	{
+		m = (l + r) >> 1;
+		if (cid < font->vmtx[m].lo)
+			r = m - 1;
+		else if (cid > font->vmtx[m].hi)
+			l = m + 1;
+		else
+			return font->vmtx[m];
+	}
+
+notfound:
+	h = pdf_lookup_hmtx(ctx, font, cid);
+	v = font->dvmtx;
+	v.x = h.w / 2;
+	return v;
+}