--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/include/mupdf/fitz/track-usage.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,57 @@
+// 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.
+
+#ifndef TRACK_USAGE_H
+#define TRACK_USAGE_H
+
+#ifdef TRACK_USAGE
+
+typedef struct track_usage_data {
+	int count;
+	const char *function;
+	int line;
+	const char *desc;
+	struct track_usage_data *next;
+} track_usage_data;
+
+#define TRACK_LABEL(A) \
+	do { \
+		static track_usage_data USAGE_DATA = { 0 };\
+		track_usage(&USAGE_DATA, __FILE__, __LINE__, A);\
+	} while (0)
+
+#define TRACK_FN() \
+	do { \
+		static track_usage_data USAGE_DATA = { 0 };\
+		track_usage(&USAGE_DATA, __FILE__, __LINE__, __FUNCTION__);\
+	} while (0)
+
+void track_usage(track_usage_data *data, const char *function, int line, const char *desc);
+
+#else
+
+#define TRACK_LABEL(A) do { } while (0)
+#define TRACK_FN() do { } while (0)
+
+#endif
+
+#endif