For Qt GUI, added option to use palette background color as video background color. This option can be accessed from via main menu -> option submenu.

src/drivers/Qt/ConsoleWindow.cpp

@@ -894,7 +894,6 @@ void consoleWin_t::createMainMenu(void)
 	QActionGroup *group;
 	int useNativeMenuBar;
 	int customAutofireOnFrames, customAutofireOffFrames;
-	ColorMenuItem *bgColorItem;
 	//QShortcut *shortcut;
 
 	menubar = new consoleMenuBar(this);
@@ -1254,15 +1253,32 @@ void consoleWin_t::createMainMenu(void)
 
 	optMenu->addAction(act);
 
+	optMenu->addSeparator();
+
 	// Options -> Video BG Color
 	fceuLoadConfigColor( "SDL.VideoBgColor", &videoBgColor );
 
-	bgColorItem = new ColorMenuItem( tr("BG Side Panel Color"), "SDL.VideoBgColor", this );
+	bgColorMenuItem = new ColorMenuItem( tr("BG Side Panel Color"), "SDL.VideoBgColor", this );
-	bgColorItem->connectColor( &videoBgColor );
+	bgColorMenuItem->connectColor( &videoBgColor );
 
-	optMenu->addAction(bgColorItem);
+	optMenu->addAction(bgColorMenuItem);
 
-	connect( bgColorItem, SIGNAL(colorChanged(QColor&)), this, SLOT(videoBgColorChanged(QColor&)) );
+	connect( bgColorMenuItem, SIGNAL(colorChanged(QColor&)), this, SLOT(videoBgColorChanged(QColor&)) );
+
+	// Options -> Use BG Palette for Video BG Color
+	g_config->getOption( "SDL.UseBgPaletteForVideo", &usePaletteForVideoBg );
+
+	act = new QAction(tr("Use BG Palette for Video BG Color"), this);
+	//act->setShortcut( QKeySequence(tr("Alt+/")));
+	act->setCheckable(true);
+	act->setChecked( usePaletteForVideoBg );
+	act->setStatusTip(tr("Use BG Palette for Video BG Color"));
+	//act->setIcon( style()->standardIcon( QStyle::SP_TitleBarMaxButton ) );
+	connect(act, SIGNAL(triggered(bool)), this, SLOT(toggleUseBgPaletteForVideo(bool)) );
+
+	optMenu->addAction(act);
+
+	bgColorMenuItem->setEnabled( !usePaletteForVideoBg );
 	//-----------------------------------------------------------------------
 	// Emulation
 
@@ -2152,6 +2168,20 @@ void consoleWin_t::toggleMenuAutoHide(bool checked)
 	g_config->save();
 }
 //---------------------------------------------------------------------------
+void consoleWin_t::toggleUseBgPaletteForVideo(bool checked)
+{
+	usePaletteForVideoBg = checked;
+
+	g_config->setOption( "SDL.UseBgPaletteForVideo", usePaletteForVideoBg );
+	g_config->save();
+
+	if ( !usePaletteForVideoBg )
+	{
+		fceuLoadConfigColor( "SDL.VideoBgColor", &videoBgColor );
+	}
+	bgColorMenuItem->setEnabled( !usePaletteForVideoBg );
+}
+//---------------------------------------------------------------------------
 void consoleWin_t::closeApp(void)
 {
 	nes_shm->runEmulator = 0;

src/drivers/Qt/ConsoleWindow.h

@@ -27,6 +27,7 @@
 #include <QRecursiveMutex>
 #endif
 
+#include "Qt/ColorMenu.h"
 #include "Qt/ConsoleViewerGL.h"
 #include "Qt/ConsoleViewerSDL.h"
 #include "Qt/GamePadConf.h"
@@ -259,6 +260,7 @@ class  consoleWin_t : public QMainWindow
 
 		QTimer  *gameTimer;
 		QColor   videoBgColor;
+		ColorMenuItem *bgColorMenuItem;
 
 		std::string errorMsg;
 		bool        errorMsgValid;
@@ -453,6 +455,7 @@ class  consoleWin_t : public QMainWindow
 		void winActiveChanged(void);
 		void emuFrameFinish(void);
 		void toggleMenuAutoHide(bool);
+		void toggleUseBgPaletteForVideo(bool);
 		void videoBgColorChanged( QColor &c );
 		void loadRomRequestCB( QString s );
 

src/drivers/Qt/config.cpp

@@ -535,6 +535,7 @@ InitConfig()
 	config->addOption('f', "fullscreen", "SDL.Fullscreen", 0);
 	config->addOption("videoDriver", "SDL.VideoDriver", 0);
 	config->addOption("SDL.VideoBgColor", "#000000");
+	config->addOption("SDL.UseBgPaletteForVideo", false);
 	config->addOption("SDL.VideoVsync", 1);
 
 	// set x/y res to 0 for automatic fullscreen resolution detection (no change)

src/drivers/Qt/fceuWrapper.cpp

@@ -89,6 +89,7 @@ bool pauseAfterPlayback = false;
 bool suggestReadOnlyReplay = true;
 bool showStatusIconOpt = true;
 bool drawInputAidsEnable = true;
+bool usePaletteForVideoBg = false;
 unsigned int gui_draw_area_width   = 256;
 unsigned int gui_draw_area_height  = 256;
 

src/drivers/Qt/fceuWrapper.h

@@ -18,6 +18,7 @@ extern bool suggestReadOnlyReplay;
 extern bool emulatorCycleToggle;
 extern bool showStatusIconOpt;
 extern bool drawInputAidsEnable;
+extern bool usePaletteForVideoBg;
 extern unsigned int gui_draw_area_width;
 extern unsigned int gui_draw_area_height;
 extern unsigned int emulatorCycleCount;

src/drivers/Qt/sdl-video.cpp

@@ -37,6 +37,7 @@
 #include "Qt/sdl-video.h"
 #include "Qt/AviRecord.h"
 #include "Qt/fceuWrapper.h"
+#include "Qt/ConsoleWindow.h"
 
 #ifdef CREATE_AVI
 #include "../videolog/nesvideos-piece.h"
@@ -74,6 +75,7 @@ extern bool MaxSpeed;
 extern int input_display;
 extern int frame_display;
 extern int rerecord_display;
+extern uint8 PALRAM[0x20];
 
 /**
  * Attempts to destroy the graphical video display.  Returns 0 on
@@ -498,6 +500,19 @@ BlitScreen(uint8 *XBuf)
 {
 	int i = nes_shm->pixBufIdx;
 
+	if (usePaletteForVideoBg)
+	{
+		unsigned char r, g, b;
+		FCEUD_GetPalette(0x80 | PALRAM[0], &r, &g, &b);
+
+		if (consoleWindow)
+		{
+			QColor *bgColor = consoleWindow->getVideoBgColorPtr();
+
+			*bgColor = QColor::fromRgb(r,g,b);
+		}
+	}
+
 	doBlitScreen(XBuf, (uint8_t*)nes_shm->pixbuf[i]);
 
 	nes_shm->pixBufIdx = (i+1) % NES_VIDEO_BUFLEN;