Add openpilot tools

tools/cabana/chart/sparkline.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <QPixmap>
+#include <QPointF>
+#include <vector>
+
+#include "tools/cabana/dbc/dbc.h"
+
+class Sparkline {
+public:
+  void update(const MessageId &msg_id, const cabana::Signal *sig, double last_msg_ts, int range, QSize size);
+  inline double freq() const { return freq_; }
+  bool isEmpty() const { return pixmap.isNull(); }
+
+  QPixmap pixmap;
+  double min_val = 0;
+  double max_val = 0;
+
+private:
+  void render(const QColor &color, int range, QSize size);
+
+  std::vector<QPointF> points;
+  double freq_ = 0;
+};