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diff --git a/log.h b/log.h
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+/*
+ * Logging infrastructure
+ * Copyright 2017 Anton Khirnov <anton@khirnov.net>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MG2D_LOG_H
+#define MG2D_LOG_H
+
+#include <stdarg.h>
+
+typedef struct MG2DLogger {
+    void *opaque;
+    void (*log)(struct MG2DLogger *log, int level, const char *fmt, va_list vl);
+} MG2DLogger;
+
+void mg2di_log(MG2DLogger *log, int level, const char *fmt, ...);
+void mg2di_log_default_callback(MG2DLogger *log, int level,
+                                const char *fmt, va_list vl);
+
+#endif // MG2D_LOG_H