Remove background color methods

When the class name was `OBSQTDisplay`, the background color was
automatically configured from the style sheet. Since the previous commit
changes the class name, we not longer need to define these method to
configure the background color.

Author: norihiro

include/NorisQTDisplay.hpp

@@ -37,8 +37,6 @@
 
 class NORISCOMMONUI_EXPORT NorisQTDisplay : public QWidget {
 	Q_OBJECT
-	Q_PROPERTY(QColor displayBackgroundColor MEMBER backgroundColor READ GetDisplayBackgroundColor WRITE
-			   SetDisplayBackgroundColor)
 
 	struct private_data_s &priv;
 
@@ -59,8 +57,6 @@ class NORISCOMMONUI_EXPORT NorisQTDisplay : public QWidget {
 
 	obs_display_t *GetDisplay() const;
 
-	QColor GetDisplayBackgroundColor() const;
-	void SetDisplayBackgroundColor(const QColor &color);
 	void CreateDisplay();
 	void DestroyDisplay();
 

src/NorisQTDisplay.cpp

@@ -46,12 +46,10 @@
 
 #include "moc_NorisQTDisplay.cpp"
 
-#define GREY_COLOR_BACKGROUND 0xFF4C4C4C
+#define DEFAULT_BACKGROUND_COLOR 0xFF000000
 
 struct private_data_s {
 	OBSDisplay display;
-	uint32_t backgroundColor = GREY_COLOR_BACKGROUND;
-	void UpdateDisplayBackgroundColor();
 };
 
 static inline long long color_to_int(const QColor &color)
@@ -159,26 +157,6 @@ obs_display_t *NorisQTDisplay::GetDisplay() const
 	return priv.display;
 }
 
-QColor NorisQTDisplay::GetDisplayBackgroundColor() const
-{
-	return rgba_to_color(priv.backgroundColor);
-}
-
-void NorisQTDisplay::SetDisplayBackgroundColor(const QColor &color)
-{
-	uint32_t newBackgroundColor = (uint32_t)color_to_int(color);
-
-	if (newBackgroundColor != priv.backgroundColor) {
-		priv.backgroundColor = newBackgroundColor;
-		priv.UpdateDisplayBackgroundColor();
-	}
-}
-
-void private_data_s::UpdateDisplayBackgroundColor()
-{
-	obs_display_set_background_color(display, backgroundColor);
-}
-
 void NorisQTDisplay::CreateDisplay()
 {
 	if (priv.display)
@@ -198,7 +176,7 @@ void NorisQTDisplay::CreateDisplay()
 	if (!QTToGSWindow(windowHandle(), info.window))
 		return;
 
-	priv.display = obs_display_create(&info, priv.backgroundColor);
+	priv.display = obs_display_create(&info, DEFAULT_BACKGROUND_COLOR);
 
 	emit DisplayCreated(this);
 }