color: QDebug implementation

Makes debugging color values easier.

app/render/color.cpp

@@ -181,3 +181,9 @@ QColor Color::toQColor() const
 
   return c;
 }
+
+QDebug operator<<(QDebug debug, const Color &r)
+{
+  debug.nospace() << "[R: " << r.red() << ", G: " << r.green() << ", B: " << r.blue() << ", A: " << r.alpha() << "]";
+  return debug.space();
+}

app/render/color.h

@@ -2,6 +2,7 @@
 #define COLOR_H
 
 #include <QColor>
+#include <QDebug>
 
 #include "common/define.h"
 #include "render/pixelformat.h"
@@ -68,4 +69,8 @@ private:
 
 };
 
+QDebug operator<<(QDebug debug, const Color& r);
+
+Q_DECLARE_METATYPE(Color)
+
 #endif // COLOR_H