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+/*
+ * 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_COMMON_H
+#define MG2D_COMMON_H
+
+#define SQR(x) ((x) * (x))
+#define SGN(x) ((x) >= 0.0 ? 1.0 : -1.0)
+#define MAX(x, y) ((x) > (y) ? (x) : (y))
+#define MIN(x, y) ((x) > (y) ? (y) : (x))
+#define ARRAY_ELEMS(arr) (sizeof(arr) / sizeof(*arr))
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/time.h>
+static inline int64_t gettime(void)
+{
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
+}
+
+#endif /* MG2D_COMMON_H */