1 files changed, 66 insertions, 0 deletions
diff --git a/src/ui/widget/framecheck.h b/src/ui/widget/framecheck.h
new file mode 100644
index 0000000..36eeea1
--- /dev/null
+++ b/src/ui/widget/framecheck.h
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Functions for logging timing events.
+ * Copyright (C) 2022 PBS <pbs3141@gmail.com>
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef FRAMECHECK_H
+#define FRAMECHECK_H
+
+#include <ostream>
+#include <glib.h>
+
+namespace Inkscape {
+namespace FrameCheck {
+
+extern std::ostream &logfile();
+
+// RAII object that logs a timing event for the duration of its lifetime.
+struct Event
+{
+    gint64 start;
+    const char *name;
+    int subtype;
+
+    Event() : start(-1) {}
+
+    Event(const char *name, int subtype = 0) : start(g_get_monotonic_time()), name(name), subtype(subtype) {}
+
+    Event(Event &&p)
+    {
+        movefrom(p);
+    }
+
+    ~Event()
+    {
+        finish();
+    }
+
+    Event &operator=(Event &&p)
+    {
+        finish();
+        movefrom(p);
+        return *this;
+    }
+
+    void movefrom(Event &p)
+    {
+        start = p.start;
+        name = p.name;
+        subtype = p.subtype;
+        p.start = -1;
+    }
+
+    void finish()
+    {
+        if (start != -1) {
+            logfile() << name << ' ' << start << ' ' << g_get_monotonic_time() << ' ' << subtype << '\n';
+        }
+    }
+};
+
+} // namespace FrameCheck
+} // namespace Inkscape
+
+#endif // FRAMECHECK_H