Add Sonogram analyzer

Co-Authored-By: Jonas Kvinge <jonas@jkvinge.net>

src/analyzer/sonogram.h

@@ -0,0 +1,51 @@
+/*
+   Strawberry Music Player
+   This file was part of Clementine.
+   Copyright 2004, Melchior FRANZ <mfranz@kde.org>
+   Copyright 2009-2010, David Sansome <davidsansome@gmail.com>
+   Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+   Copyright 2014, John Maguire <john.maguire@gmail.com>
+   Copyright 2015, Mark Furneaux <mark@furneaux.ca>
+
+   Strawberry 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.
+
+   Strawberry 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 Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef SONOGRAM_H
+#define SONOGRAM_H
+
+#include <QPixmap>
+#include <QPainter>
+
+#include "analyzerbase.h"
+
+class Sonogram : public Analyzer::Base {
+  Q_OBJECT
+ public:
+  Q_INVOKABLE explicit Sonogram(QWidget *);
+  ~Sonogram();
+
+  static const char *kName;
+
+ protected:
+  void resizeEvent(QResizeEvent *e) override;
+  void analyze(QPainter &p, const Analyzer::Scope &s, bool new_frame) override;
+  void transform(Analyzer::Scope &scope) override;
+  void demo(QPainter &p) override;
+
+ private:
+  QPixmap canvas_;
+  int scope_size_;
+};
+
+#endif  // SONOGRAM_H