#include "rgb_histogram.h"
+#include <QBrush>
+#include <QColor>
+#include <QPaintDevice>
#include <QPainter>
+#include <QPen>
+#include <QPoint>
#include <QRect>
+#include <QWidget>
+#include <algorithm>
+#include <cassert>
+#include <cstdio>
+#include <utility>
+#include <vector>
class QPaintEvent;
class QResizeEvent;