1 files changed, 57 insertions, 0 deletions
diff --git a/src/debug/gdk-event-latency-tracker.h b/src/debug/gdk-event-latency-tracker.h
new file mode 100644
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+++ b/src/debug/gdk-event-latency-tracker.h
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Inkscape::Debug::GdkEventLatencyTracker - tracks backlog of GDK events
+ *
+ * Authors:
+ *   MenTaLguY <mental@rydia.net>
+ *
+ * Copyright (C) 2008 MenTaLguY
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_INKSCAPE_DEBUG_GDK_EVENT_LATENCY_TRACKER_H
+#define SEEN_INKSCAPE_DEBUG_GDK_EVENT_LATENCY_TRACKER_H
+
+typedef union _GdkEvent GdkEvent;
+#include <glibmm/timer.h>
+#include <optional>
+
+namespace Inkscape {
+namespace Debug {
+
+class GdkEventLatencyTracker {
+public:
+    GdkEventLatencyTracker();
+    std::optional<double> process(GdkEvent const *e);
+    double maxLatency() const { return max_latency; }
+    double getSkew();
+
+    static GdkEventLatencyTracker &default_tracker();
+
+private:
+    GdkEventLatencyTracker(GdkEventLatencyTracker const &) = delete; // no copy
+    void operator=(GdkEventLatencyTracker const &) = delete; // no assign
+
+    double start_seconds;
+    double max_latency;
+    double skew;
+    double last_elapsed;
+    double last_seconds;
+    Glib::Timer elapsed;
+};
+
+}
+}
+
+#endif
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :