Video: Overscan settings

Core/BaseVideoFilter.cpp

@@ -10,7 +10,7 @@
 BaseVideoFilter::BaseVideoFilter(shared_ptr<Console> console)
 {
 	_console = console;
-	_overscan = {}; //TODO _console->GetSettings()->GetOverscanDimensions();
+	_overscan = _console->GetSettings()->GetOverscan();
 }
 
 BaseVideoFilter::~BaseVideoFilter()
@@ -29,7 +29,11 @@ void BaseVideoFilter::SetBaseFrameInfo(FrameInfo frameInfo)
 
 FrameInfo BaseVideoFilter::GetFrameInfo()
 {
-	return _baseFrameInfo;
+	FrameInfo frameInfo = _baseFrameInfo;
+	OverscanDimensions overscan = GetOverscan();
+	frameInfo.Width -= overscan.Left * 2 + overscan.Right * 2;
+	frameInfo.Height -= overscan.Top * 2 + overscan.Bottom * 2;
+	return frameInfo;
 }
 
 void BaseVideoFilter::UpdateBufferSize()
@@ -64,7 +68,7 @@ bool BaseVideoFilter::IsOddFrame()
 void BaseVideoFilter::SendFrame(uint16_t *ppuOutputBuffer, uint32_t frameNumber)
 {
 	_frameLock.Acquire();
-	_overscan = {}; //TODO _console->GetSettings()->GetOverscanDimensions();
+	_overscan = _console->GetSettings()->GetOverscan();
 	_isOddFrame = frameNumber % 2;
 	UpdateBufferSize();
 	OnBeforeApplyFilter();

Core/BaseVideoFilter.h

@@ -13,12 +13,12 @@ private:
 	SimpleLock _frameLock;
 	OverscanDimensions _overscan;
 	bool _isOddFrame;
-	FrameInfo _baseFrameInfo;
 
 	void UpdateBufferSize();
 
 protected:
 	shared_ptr<Console> _console;
+	FrameInfo _baseFrameInfo;
 
 	virtual void ApplyFilter(uint16_t *ppuOutputBuffer) = 0;
 	virtual void OnBeforeApplyFilter();

Core/DefaultVideoFilter.cpp

@@ -87,26 +87,31 @@ void DefaultVideoFilter::ApplyFilter(uint16_t *ppuOutputBuffer)
 {
 	uint32_t *out = GetOutputBuffer();
 	FrameInfo frameInfo = GetFrameInfo();
+	OverscanDimensions overscan = GetOverscan();
+
+	uint32_t xOffset = overscan.Left * 2;
+	uint32_t yOffset = overscan.Top * 2 * 512;
 
 	uint8_t scanlineIntensity = (uint8_t)((1.0 - _console->GetSettings()->GetVideoConfig().ScanlineIntensity) * 255);
 	if(scanlineIntensity < 255) {
 		for(uint32_t i = 0; i < frameInfo.Height; i++) {
 			if(i & 0x01) {
 				for(uint32_t j = 0; j < frameInfo.Width; j++) {
-					*out = ApplyScanlineEffect(_calculatedPalette[ppuOutputBuffer[i * 512 + j]], scanlineIntensity);
+					*out = ApplyScanlineEffect(_calculatedPalette[ppuOutputBuffer[i * 512 + j + yOffset + xOffset]], scanlineIntensity);
 					out++;
 				}
 			} else {
 				for(uint32_t j = 0; j < frameInfo.Width; j++) {
-					*out = _calculatedPalette[ppuOutputBuffer[i * 512 + j]];
+					*out = _calculatedPalette[ppuOutputBuffer[i * 512 + j + yOffset + xOffset]];
 					out++;
 				}
 			}
 		}
 	} else {
-		uint32_t pixelCount = frameInfo.Width * frameInfo.Height;
+		for(uint32_t i = 0; i < frameInfo.Height; i++) {
-		for(uint32_t i = 0; i < pixelCount; i++) {
+			for(uint32_t j = 0; j < frameInfo.Width; j++) {
-			out[i] = _calculatedPalette[ppuOutputBuffer[i]];
+				out[i*frameInfo.Width+j] = _calculatedPalette[ppuOutputBuffer[i * 512 + j + yOffset + xOffset]];
+			}
 		}
 	}
 }

Core/EmuSettings.cpp

@@ -151,6 +151,16 @@ vector<KeyCombination> EmuSettings::GetShortcutSupersets(EmulatorShortcut shortc
 	return _shortcutSupersets[keySetIndex][(uint32_t)shortcut];
 }
 
+OverscanDimensions EmuSettings::GetOverscan()
+{
+	OverscanDimensions overscan;
+	overscan.Left = _video.OverscanLeft;
+	overscan.Right = _video.OverscanRight;
+	overscan.Top = _video.OverscanTop;
+	overscan.Bottom = _video.OverscanBottom;
+	return overscan;
+}
+
 uint32_t EmuSettings::GetRewindBufferSize()
 {
 	return _preferences.RewindBufferSize;

Core/EmuSettings.h

@@ -51,6 +51,7 @@ public:
 	KeyCombination GetShortcutKey(EmulatorShortcut shortcut, int keySetIndex);
 	vector<KeyCombination> GetShortcutSupersets(EmulatorShortcut shortcut, int keySetIndex);
 
+	OverscanDimensions GetOverscan();
 	uint32_t GetRewindBufferSize();
 	uint32_t GetEmulationSpeed();
 	double GetAspectRatio();

Core/NtscFilter.cpp

@@ -15,7 +15,8 @@ NtscFilter::NtscFilter(shared_ptr<Console> console) : BaseVideoFilter(console)
 FrameInfo NtscFilter::GetFrameInfo()
 {
 	FrameInfo frameInfo = BaseVideoFilter::GetFrameInfo();
-	frameInfo.Width = SNES_NTSC_OUT_WIDTH(frameInfo.Width / 2);
+	OverscanDimensions overscan = GetOverscan();
+	frameInfo.Width = SNES_NTSC_OUT_WIDTH(_baseFrameInfo.Width / 2) - overscan.Left * 2 - overscan.Right * 2;
 	return frameInfo;
 }
 
@@ -45,22 +46,29 @@ void NtscFilter::OnBeforeApplyFilter()
 void NtscFilter::ApplyFilter(uint16_t *ppuOutputBuffer)
 {
 	FrameInfo frameInfo = GetFrameInfo();
+	OverscanDimensions overscan = GetOverscan();
+	uint32_t baseWidth = SNES_NTSC_OUT_WIDTH(256);
+	uint32_t xOffset = overscan.Left * 2;
+	uint32_t yOffset = overscan.Top * 2 * baseWidth;
+
 	snes_ntsc_blit_hires(&_ntscData, ppuOutputBuffer, 512, IsOddFrame() ? 0 : 1, 512, frameInfo.Height, _ntscBuffer, SNES_NTSC_OUT_WIDTH(256)*4);
 	VideoConfig cfg = _console->GetSettings()->GetVideoConfig();
 
 	if(cfg.ScanlineIntensity == 0) {
-		memcpy(GetOutputBuffer(), _ntscBuffer, frameInfo.Width * frameInfo.Height * sizeof(uint32_t));
+		for(uint32_t i = 0; i < frameInfo.Height; i++) {
+			memcpy(GetOutputBuffer()+i*frameInfo.Width, _ntscBuffer + yOffset + xOffset + i*baseWidth, frameInfo.Width * sizeof(uint32_t));
+		}
 	} else {
 		uint8_t intensity = (uint8_t)((1.0 - cfg.ScanlineIntensity) * 255);
 		for(uint32_t i = 0; i < frameInfo.Height; i++) {
 			if(i & 0x01) {
-				uint32_t *in = _ntscBuffer + i * frameInfo.Width;
+				uint32_t *in = _ntscBuffer + yOffset + xOffset + i * baseWidth;
 				uint32_t *out = GetOutputBuffer() + i * frameInfo.Width;
 				for(uint32_t j = 0; j < frameInfo.Width; j++) {
 					out[j] = ApplyScanlineEffect(in[j], intensity);
 				}
 			} else {
-				memcpy(GetOutputBuffer()+i*frameInfo.Width, _ntscBuffer+i*frameInfo.Width, frameInfo.Width * sizeof(uint32_t));
+				memcpy(GetOutputBuffer()+i*frameInfo.Width, _ntscBuffer + yOffset + xOffset + i*baseWidth, frameInfo.Width * sizeof(uint32_t));
 			}
 		}
 	}

Core/SettingTypes.h

@@ -86,6 +86,11 @@ struct VideoConfig
 	double NtscSharpness = 0;
 	bool NtscMergeFields = false;
 
+	uint32_t OverscanLeft = 0;
+	uint32_t OverscanRight = 0;
+	uint32_t OverscanTop = 0;
+	uint32_t OverscanBottom = 0;
+
 	bool FullscreenForceIntegerScale = false;
 	bool UseExclusiveFullscreen = false;
 	int32_t ExclusiveFullscreenRefreshRate = 60;

Core/VideoDecoder.cpp

@@ -18,7 +18,10 @@ VideoDecoder::VideoDecoder(shared_ptr<Console> console)
 	_console = console;
 	_frameChanged = false;
 	_stopFlag = false;
+	_baseFrameInfo = { 512, 478 };
+	_lastFrameInfo = _baseFrameInfo;
 	UpdateVideoFilter();
+	_videoFilter->SetBaseFrameInfo(_baseFrameInfo);
 }
 
 VideoDecoder::~VideoDecoder()
@@ -33,22 +36,25 @@ FrameInfo VideoDecoder::GetFrameInfo()
 
 ScreenSize VideoDecoder::GetScreenSize(bool ignoreScale)
 {
-	ScreenSize size = {};
+	ScreenSize size;
-	if(_videoFilter) {
+	OverscanDimensions overscan = ignoreScale ? _videoFilter->GetOverscan() : _console->GetSettings()->GetOverscan();
-		VideoConfig config = _console->GetSettings()->GetVideoConfig();
+	FrameInfo frameInfo = _videoFilter->GetFrameInfo();
-		double aspectRatio = _console->GetSettings()->GetAspectRatio();
+	double aspectRatio = _console->GetSettings()->GetAspectRatio();
-		double scale = (ignoreScale ? 1 : config.VideoScale);
+	double scale = (ignoreScale ? 1 : _console->GetSettings()->GetVideoConfig().VideoScale);
-		size.Width = (int32_t)(_baseFrameInfo.Width * scale / 2);
+	size.Width = (int32_t)(frameInfo.Width * scale / 2);
-		size.Height = (int32_t)(_baseFrameInfo.Height * scale / 2);
+	size.Height = (int32_t)(frameInfo.Height * scale / 2);
-		size.Scale = scale;
+	if(aspectRatio != 0.0) {
-		if(aspectRatio != 0.0) {
+		uint32_t originalHeight = frameInfo.Height + (overscan.Top + overscan.Bottom) * 2;
-			size.Width = (uint32_t)(_baseFrameInfo.Height * scale * aspectRatio / 2);
+		uint32_t originalWidth = frameInfo.Width + (overscan.Left + overscan.Right) * 2;
-		}
+		size.Width = (uint32_t)(originalHeight * scale * aspectRatio * ((double)frameInfo.Width / originalWidth)) / 2;
-
-		/*if(_console->GetSettings()->GetScreenRotation() % 180) {
-			std::swap(size.Width, size.Height);
-		}*/
 	}
+
+	/*
+	if(_console->GetSettings()->GetScreenRotation() % 180) {
+		std::swap(size.Width, size.Height);
+	}*/
+
+	size.Scale = scale;
 	return size;
 }
 

Core/VideoDecoder.h

@@ -28,9 +28,9 @@ private:
 	atomic<bool> _stopFlag;
 	uint32_t _frameCount = 0;
 
-	FrameInfo _baseFrameInfo = { 512, 478 };
 	ScreenSize _previousScreenSize = {};
 	double _previousScale = 0;
+	FrameInfo _baseFrameInfo;
 	FrameInfo _lastFrameInfo;
 
 	VideoFilterType _videoFilterType = VideoFilterType::None;

UI/Config/VideoConfig.cs

@@ -33,6 +33,11 @@ namespace Mesen.GUI.Config
 		[MinMax(-1, 1.0)] public double NtscSharpness = 0;
 		[MarshalAs(UnmanagedType.I1)] public bool NtscMergeFields = false;
 
+		[MinMax(0, 100)] public UInt32 OverscanLeft = 0;
+		[MinMax(0, 100)] public UInt32 OverscanRight = 0;
+		[MinMax(0, 100)] public UInt32 OverscanTop = 0;
+		[MinMax(0, 100)] public UInt32 OverscanBottom = 0;
+
 		[MarshalAs(UnmanagedType.I1)] public bool FullscreenForceIntegerScale = false;
 		[MarshalAs(UnmanagedType.I1)] public bool UseExclusiveFullscreen = false;
 		public Int32 ExclusiveFullscreenRefreshRate = 60;

UI/Emulation/DisplayManager.cs

@@ -16,6 +16,7 @@ namespace Mesen.GUI.Emulation
 		private frmMain _frm;
 		private ctrlRenderer _renderer;
 		private Panel _panel;
+		private bool _resizeForm;
 
 		public DisplayManager(frmMain frm, ctrlRenderer renderer, Panel panel)
 		{
@@ -30,11 +31,11 @@ namespace Mesen.GUI.Emulation
 			SetScaleBasedOnWindowSize();
 		}
 
-		public void UpdateViewerSize(bool resizeForm)
+		public void UpdateViewerSize()
 		{
 			ScreenSize screenSize = EmuApi.GetScreenSize(false);
 
-			if(resizeForm && _frm.WindowState != FormWindowState.Maximized) {
+			if(_resizeForm && _frm.WindowState != FormWindowState.Maximized) {
 				_frm.Resize -= frmMain_Resize;
 				Size newSize = new Size(screenSize.Width, screenSize.Height);
 				_frm.ClientSize = new Size(newSize.Width, newSize.Height + _panel.Top);
@@ -72,11 +73,12 @@ namespace Mesen.GUI.Emulation
 
 		public void SetScale(double scale, bool resizeForm)
 		{
+			_resizeForm = resizeForm;
 			ConfigManager.Config.Video.VideoScale = scale;
 			ConfigManager.Config.Video.ApplyConfig();
 			ConfigManager.ApplyChanges();
 
-			UpdateViewerSize(resizeForm);
+			UpdateViewerSize();
 		}
 
 		public void ToggleFullscreen()

UI/Forms/Config/frmVideoConfig.Designer.cs

@@ -76,6 +76,21 @@
 			this.mnuPresetSVideo = new System.Windows.Forms.ToolStripMenuItem();
 			this.mnuPresetRgb = new System.Windows.Forms.ToolStripMenuItem();
 			this.mnuPresetMonochrome = new System.Windows.Forms.ToolStripMenuItem();
+			this.tpgOverscan = new System.Windows.Forms.TabPage();
+			this.tableLayoutPanel1 = new System.Windows.Forms.TableLayoutPanel();
+			this.picOverscan = new System.Windows.Forms.PictureBox();
+			this.tableLayoutPanel11 = new System.Windows.Forms.TableLayoutPanel();
+			this.nudOverscanTop = new Mesen.GUI.Controls.MesenNumericUpDown();
+			this.lblTop = new System.Windows.Forms.Label();
+			this.tableLayoutPanel12 = new System.Windows.Forms.TableLayoutPanel();
+			this.nudOverscanBottom = new Mesen.GUI.Controls.MesenNumericUpDown();
+			this.lblBottom = new System.Windows.Forms.Label();
+			this.tableLayoutPanel13 = new System.Windows.Forms.TableLayoutPanel();
+			this.nudOverscanRight = new Mesen.GUI.Controls.MesenNumericUpDown();
+			this.lblRight = new System.Windows.Forms.Label();
+			this.tableLayoutPanel14 = new System.Windows.Forms.TableLayoutPanel();
+			this.nudOverscanLeft = new Mesen.GUI.Controls.MesenNumericUpDown();
+			this.lblLeft = new System.Windows.Forms.Label();
 			this.tabMain.SuspendLayout();
 			this.tpgGeneral.SuspendLayout();
 			this.tlpMain.SuspendLayout();
@@ -91,6 +106,13 @@
 			this.grpScanlines.SuspendLayout();
 			this.tableLayoutPanel8.SuspendLayout();
 			this.ctxPicturePresets.SuspendLayout();
+			this.tpgOverscan.SuspendLayout();
+			this.tableLayoutPanel1.SuspendLayout();
+			((System.ComponentModel.ISupportInitialize)(this.picOverscan)).BeginInit();
+			this.tableLayoutPanel11.SuspendLayout();
+			this.tableLayoutPanel12.SuspendLayout();
+			this.tableLayoutPanel13.SuspendLayout();
+			this.tableLayoutPanel14.SuspendLayout();
 			this.SuspendLayout();
 			// 
 			// baseConfigPanel
@@ -102,6 +124,7 @@
 			// 
 			this.tabMain.Controls.Add(this.tpgGeneral);
 			this.tabMain.Controls.Add(this.tpgPicture);
+			this.tabMain.Controls.Add(this.tpgOverscan);
 			this.tabMain.Dock = System.Windows.Forms.DockStyle.Fill;
 			this.tabMain.Location = new System.Drawing.Point(0, 0);
 			this.tabMain.Name = "tabMain";
@@ -791,6 +814,294 @@
 			this.mnuPresetMonochrome.Text = "Monochrome";
 			this.mnuPresetMonochrome.Click += new System.EventHandler(this.mnuPresetMonochrome_Click);
 			// 
+			// tpgOverscan
+			// 
+			this.tpgOverscan.Controls.Add(this.tableLayoutPanel1);
+			this.tpgOverscan.Location = new System.Drawing.Point(4, 22);
+			this.tpgOverscan.Name = "tpgOverscan";
+			this.tpgOverscan.Padding = new System.Windows.Forms.Padding(3);
+			this.tpgOverscan.Size = new System.Drawing.Size(566, 382);
+			this.tpgOverscan.TabIndex = 6;
+			this.tpgOverscan.Text = "Overscan";
+			this.tpgOverscan.UseVisualStyleBackColor = true;
+			// 
+			// tableLayoutPanel1
+			// 
+			this.tableLayoutPanel1.ColumnCount = 3;
+			this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 50F));
+			this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Absolute, 262F));
+			this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 50F));
+			this.tableLayoutPanel1.Controls.Add(this.picOverscan, 1, 1);
+			this.tableLayoutPanel1.Controls.Add(this.tableLayoutPanel11, 1, 0);
+			this.tableLayoutPanel1.Controls.Add(this.tableLayoutPanel12, 1, 2);
+			this.tableLayoutPanel1.Controls.Add(this.tableLayoutPanel13, 2, 1);
+			this.tableLayoutPanel1.Controls.Add(this.tableLayoutPanel14, 0, 1);
+			this.tableLayoutPanel1.Dock = System.Windows.Forms.DockStyle.Fill;
+			this.tableLayoutPanel1.Location = new System.Drawing.Point(3, 3);
+			this.tableLayoutPanel1.Name = "tableLayoutPanel1";
+			this.tableLayoutPanel1.RowCount = 3;
+			this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));
+			this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Absolute, 246F));
+			this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));
+			this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Absolute, 20F));
+			this.tableLayoutPanel1.Size = new System.Drawing.Size(560, 376);
+			this.tableLayoutPanel1.TabIndex = 1;
+			// 
+			// picOverscan
+			// 
+			this.picOverscan.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
+			this.picOverscan.Dock = System.Windows.Forms.DockStyle.Fill;
+			this.picOverscan.Location = new System.Drawing.Point(152, 68);
+			this.picOverscan.Name = "picOverscan";
+			this.picOverscan.Size = new System.Drawing.Size(256, 240);
+			this.picOverscan.TabIndex = 1;
+			this.picOverscan.TabStop = false;
+			// 
+			// tableLayoutPanel11
+			// 
+			this.tableLayoutPanel11.ColumnCount = 1;
+			this.tableLayoutPanel11.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 100F));
+			this.tableLayoutPanel11.Controls.Add(this.nudOverscanTop, 0, 1);
+			this.tableLayoutPanel11.Controls.Add(this.lblTop, 0, 0);
+			this.tableLayoutPanel11.Dock = System.Windows.Forms.DockStyle.Fill;
+			this.tableLayoutPanel11.Location = new System.Drawing.Point(149, 0);
+			this.tableLayoutPanel11.Margin = new System.Windows.Forms.Padding(0);
+			this.tableLayoutPanel11.Name = "tableLayoutPanel11";
+			this.tableLayoutPanel11.RowCount = 2;
+			this.tableLayoutPanel11.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 100F));
+			this.tableLayoutPanel11.RowStyles.Add(new System.Windows.Forms.RowStyle());
+			this.tableLayoutPanel11.Size = new System.Drawing.Size(262, 65);
+			this.tableLayoutPanel11.TabIndex = 4;
+			// 
+			// nudOverscanTop
+			// 
+			this.nudOverscanTop.Anchor = System.Windows.Forms.AnchorStyles.Bottom;
+			this.nudOverscanTop.DecimalPlaces = 0;
+			this.nudOverscanTop.Increment = new decimal(new int[] {
+            1,
+            0,
+            0,
+            0});
+			this.nudOverscanTop.Location = new System.Drawing.Point(110, 44);
+			this.nudOverscanTop.Margin = new System.Windows.Forms.Padding(0);
+			this.nudOverscanTop.Maximum = new decimal(new int[] {
+            100,
+            0,
+            0,
+            0});
+			this.nudOverscanTop.MaximumSize = new System.Drawing.Size(10000, 20);
+			this.nudOverscanTop.Minimum = new decimal(new int[] {
+            0,
+            0,
+            0,
+            0});
+			this.nudOverscanTop.MinimumSize = new System.Drawing.Size(0, 21);
+			this.nudOverscanTop.Name = "nudOverscanTop";
+			this.nudOverscanTop.Size = new System.Drawing.Size(41, 21);
+			this.nudOverscanTop.TabIndex = 2;
+			this.nudOverscanTop.Value = new decimal(new int[] {
+            0,
+            0,
+            0,
+            0});
+			this.nudOverscanTop.ValueChanged += new System.EventHandler(this.nudOverscan_ValueChanged);
+			// 
+			// lblTop
+			// 
+			this.lblTop.Anchor = System.Windows.Forms.AnchorStyles.Bottom;
+			this.lblTop.AutoSize = true;
+			this.lblTop.Location = new System.Drawing.Point(118, 31);
+			this.lblTop.Name = "lblTop";
+			this.lblTop.Size = new System.Drawing.Size(26, 13);
+			this.lblTop.TabIndex = 0;
+			this.lblTop.Text = "Top";
+			this.lblTop.TextAlign = System.Drawing.ContentAlignment.TopCenter;
+			// 
+			// tableLayoutPanel12
+			// 
+			this.tableLayoutPanel12.ColumnCount = 1;
+			this.tableLayoutPanel12.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 100F));
+			this.tableLayoutPanel12.Controls.Add(this.nudOverscanBottom, 0, 1);
+			this.tableLayoutPanel12.Controls.Add(this.lblBottom, 0, 0);
+			this.tableLayoutPanel12.Location = new System.Drawing.Point(149, 311);
+			this.tableLayoutPanel12.Margin = new System.Windows.Forms.Padding(0);
+			this.tableLayoutPanel12.Name = "tableLayoutPanel12";
+			this.tableLayoutPanel12.RowCount = 2;
+			this.tableLayoutPanel12.RowStyles.Add(new System.Windows.Forms.RowStyle());
+			this.tableLayoutPanel12.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 100F));
+			this.tableLayoutPanel12.Size = new System.Drawing.Size(262, 58);
+			this.tableLayoutPanel12.TabIndex = 5;
+			// 
+			// nudOverscanBottom
+			// 
+			this.nudOverscanBottom.Anchor = System.Windows.Forms.AnchorStyles.Top;
+			this.nudOverscanBottom.DecimalPlaces = 0;
+			this.nudOverscanBottom.Increment = new decimal(new int[] {
+            1,
+            0,
+            0,
+            0});
+			this.nudOverscanBottom.Location = new System.Drawing.Point(110, 13);
+			this.nudOverscanBottom.Margin = new System.Windows.Forms.Padding(0);
+			this.nudOverscanBottom.Maximum = new decimal(new int[] {
+            100,
+            0,
+            0,
+            0});
+			this.nudOverscanBottom.MaximumSize = new System.Drawing.Size(10000, 20);
+			this.nudOverscanBottom.Minimum = new decimal(new int[] {
+            0,
+            0,
+            0,
+            0});
+			this.nudOverscanBottom.MinimumSize = new System.Drawing.Size(0, 21);
+			this.nudOverscanBottom.Name = "nudOverscanBottom";
+			this.nudOverscanBottom.Size = new System.Drawing.Size(41, 21);
+			this.nudOverscanBottom.TabIndex = 2;
+			this.nudOverscanBottom.Value = new decimal(new int[] {
+            0,
+            0,
+            0,
+            0});
+			this.nudOverscanBottom.ValueChanged += new System.EventHandler(this.nudOverscan_ValueChanged);
+			// 
+			// lblBottom
+			// 
+			this.lblBottom.Anchor = System.Windows.Forms.AnchorStyles.Top;
+			this.lblBottom.AutoSize = true;
+			this.lblBottom.Location = new System.Drawing.Point(111, 0);
+			this.lblBottom.Name = "lblBottom";
+			this.lblBottom.Size = new System.Drawing.Size(40, 13);
+			this.lblBottom.TabIndex = 0;
+			this.lblBottom.Text = "Bottom";
+			this.lblBottom.TextAlign = System.Drawing.ContentAlignment.TopCenter;
+			// 
+			// tableLayoutPanel13
+			// 
+			this.tableLayoutPanel13.ColumnCount = 2;
+			this.tableLayoutPanel13.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle());
+			this.tableLayoutPanel13.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 100F));
+			this.tableLayoutPanel13.Controls.Add(this.nudOverscanRight, 0, 2);
+			this.tableLayoutPanel13.Controls.Add(this.lblRight, 0, 1);
+			this.tableLayoutPanel13.Dock = System.Windows.Forms.DockStyle.Fill;
+			this.tableLayoutPanel13.Location = new System.Drawing.Point(411, 65);
+			this.tableLayoutPanel13.Margin = new System.Windows.Forms.Padding(0);
+			this.tableLayoutPanel13.Name = "tableLayoutPanel13";
+			this.tableLayoutPanel13.RowCount = 4;
+			this.tableLayoutPanel13.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));
+			this.tableLayoutPanel13.RowStyles.Add(new System.Windows.Forms.RowStyle());
+			this.tableLayoutPanel13.RowStyles.Add(new System.Windows.Forms.RowStyle());
+			this.tableLayoutPanel13.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));
+			this.tableLayoutPanel13.Size = new System.Drawing.Size(149, 246);
+			this.tableLayoutPanel13.TabIndex = 6;
+			// 
+			// nudOverscanRight
+			// 
+			this.nudOverscanRight.Anchor = System.Windows.Forms.AnchorStyles.Top;
+			this.nudOverscanRight.DecimalPlaces = 0;
+			this.nudOverscanRight.Increment = new decimal(new int[] {
+            1,
+            0,
+            0,
+            0});
+			this.nudOverscanRight.Location = new System.Drawing.Point(0, 119);
+			this.nudOverscanRight.Margin = new System.Windows.Forms.Padding(0);
+			this.nudOverscanRight.Maximum = new decimal(new int[] {
+            100,
+            0,
+            0,
+            0});
+			this.nudOverscanRight.MaximumSize = new System.Drawing.Size(10000, 20);
+			this.nudOverscanRight.Minimum = new decimal(new int[] {
+            0,
+            0,
+            0,
+            0});
+			this.nudOverscanRight.MinimumSize = new System.Drawing.Size(0, 21);
+			this.nudOverscanRight.Name = "nudOverscanRight";
+			this.nudOverscanRight.Size = new System.Drawing.Size(41, 21);
+			this.nudOverscanRight.TabIndex = 1;
+			this.nudOverscanRight.Value = new decimal(new int[] {
+            0,
+            0,
+            0,
+            0});
+			this.nudOverscanRight.ValueChanged += new System.EventHandler(this.nudOverscan_ValueChanged);
+			// 
+			// lblRight
+			// 
+			this.lblRight.Anchor = System.Windows.Forms.AnchorStyles.Top;
+			this.lblRight.AutoSize = true;
+			this.lblRight.Location = new System.Drawing.Point(4, 106);
+			this.lblRight.Name = "lblRight";
+			this.lblRight.Size = new System.Drawing.Size(32, 13);
+			this.lblRight.TabIndex = 0;
+			this.lblRight.Text = "Right";
+			this.lblRight.TextAlign = System.Drawing.ContentAlignment.TopCenter;
+			// 
+			// tableLayoutPanel14
+			// 
+			this.tableLayoutPanel14.ColumnCount = 2;
+			this.tableLayoutPanel14.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 100F));
+			this.tableLayoutPanel14.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle());
+			this.tableLayoutPanel14.Controls.Add(this.nudOverscanLeft, 1, 2);
+			this.tableLayoutPanel14.Controls.Add(this.lblLeft, 1, 1);
+			this.tableLayoutPanel14.Dock = System.Windows.Forms.DockStyle.Fill;
+			this.tableLayoutPanel14.Location = new System.Drawing.Point(0, 65);
+			this.tableLayoutPanel14.Margin = new System.Windows.Forms.Padding(0);
+			this.tableLayoutPanel14.Name = "tableLayoutPanel14";
+			this.tableLayoutPanel14.RowCount = 4;
+			this.tableLayoutPanel14.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));
+			this.tableLayoutPanel14.RowStyles.Add(new System.Windows.Forms.RowStyle());
+			this.tableLayoutPanel14.RowStyles.Add(new System.Windows.Forms.RowStyle());
+			this.tableLayoutPanel14.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));
+			this.tableLayoutPanel14.Size = new System.Drawing.Size(149, 246);
+			this.tableLayoutPanel14.TabIndex = 7;
+			// 
+			// nudOverscanLeft
+			// 
+			this.nudOverscanLeft.Anchor = System.Windows.Forms.AnchorStyles.Top;
+			this.nudOverscanLeft.DecimalPlaces = 0;
+			this.nudOverscanLeft.Increment = new decimal(new int[] {
+            1,
+            0,
+            0,
+            0});
+			this.nudOverscanLeft.Location = new System.Drawing.Point(108, 119);
+			this.nudOverscanLeft.Margin = new System.Windows.Forms.Padding(0);
+			this.nudOverscanLeft.Maximum = new decimal(new int[] {
+            100,
+            0,
+            0,
+            0});
+			this.nudOverscanLeft.MaximumSize = new System.Drawing.Size(10000, 20);
+			this.nudOverscanLeft.Minimum = new decimal(new int[] {
+            0,
+            0,
+            0,
+            0});
+			this.nudOverscanLeft.MinimumSize = new System.Drawing.Size(0, 21);
+			this.nudOverscanLeft.Name = "nudOverscanLeft";
+			this.nudOverscanLeft.Size = new System.Drawing.Size(41, 21);
+			this.nudOverscanLeft.TabIndex = 2;
+			this.nudOverscanLeft.Value = new decimal(new int[] {
+            0,
+            0,
+            0,
+            0});
+			this.nudOverscanLeft.ValueChanged += new System.EventHandler(this.nudOverscan_ValueChanged);
+			// 
+			// lblLeft
+			// 
+			this.lblLeft.Anchor = System.Windows.Forms.AnchorStyles.Top;
+			this.lblLeft.AutoSize = true;
+			this.lblLeft.Location = new System.Drawing.Point(116, 106);
+			this.lblLeft.Name = "lblLeft";
+			this.lblLeft.Size = new System.Drawing.Size(25, 13);
+			this.lblLeft.TabIndex = 0;
+			this.lblLeft.Text = "Left";
+			this.lblLeft.TextAlign = System.Drawing.ContentAlignment.TopCenter;
+			// 
 			// frmVideoConfig
 			// 
 			this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
@@ -827,6 +1138,17 @@
 			this.tableLayoutPanel8.ResumeLayout(false);
 			this.tableLayoutPanel8.PerformLayout();
 			this.ctxPicturePresets.ResumeLayout(false);
+			this.tpgOverscan.ResumeLayout(false);
+			this.tableLayoutPanel1.ResumeLayout(false);
+			((System.ComponentModel.ISupportInitialize)(this.picOverscan)).EndInit();
+			this.tableLayoutPanel11.ResumeLayout(false);
+			this.tableLayoutPanel11.PerformLayout();
+			this.tableLayoutPanel12.ResumeLayout(false);
+			this.tableLayoutPanel12.PerformLayout();
+			this.tableLayoutPanel13.ResumeLayout(false);
+			this.tableLayoutPanel13.PerformLayout();
+			this.tableLayoutPanel14.ResumeLayout(false);
+			this.tableLayoutPanel14.PerformLayout();
 			this.ResumeLayout(false);
 
 		}
@@ -881,5 +1203,20 @@
 		private System.Windows.Forms.ToolStripMenuItem mnuPresetSVideo;
 		private System.Windows.Forms.ToolStripMenuItem mnuPresetRgb;
 		private System.Windows.Forms.ToolStripMenuItem mnuPresetMonochrome;
+		private System.Windows.Forms.TabPage tpgOverscan;
+		private System.Windows.Forms.TableLayoutPanel tableLayoutPanel1;
+		private System.Windows.Forms.PictureBox picOverscan;
+		private System.Windows.Forms.TableLayoutPanel tableLayoutPanel11;
+		private Controls.MesenNumericUpDown nudOverscanTop;
+		private System.Windows.Forms.Label lblTop;
+		private System.Windows.Forms.TableLayoutPanel tableLayoutPanel12;
+		private Controls.MesenNumericUpDown nudOverscanBottom;
+		private System.Windows.Forms.Label lblBottom;
+		private System.Windows.Forms.TableLayoutPanel tableLayoutPanel13;
+		private Controls.MesenNumericUpDown nudOverscanRight;
+		private System.Windows.Forms.Label lblRight;
+		private System.Windows.Forms.TableLayoutPanel tableLayoutPanel14;
+		private Controls.MesenNumericUpDown nudOverscanLeft;
+		private System.Windows.Forms.Label lblLeft;
 	}
 }

UI/Forms/Config/frmVideoConfig.cs

@@ -47,6 +47,11 @@ namespace Mesen.GUI.Forms.Config
 			AddBinding(nameof(VideoConfig.NtscResolution), trkResolution);
 			AddBinding(nameof(VideoConfig.NtscSharpness), trkSharpness);
 			AddBinding(nameof(VideoConfig.NtscMergeFields), chkMergeFields);
+
+			AddBinding(nameof(VideoConfig.OverscanLeft), nudOverscanLeft);
+			AddBinding(nameof(VideoConfig.OverscanRight), nudOverscanRight);
+			AddBinding(nameof(VideoConfig.OverscanTop), nudOverscanTop);
+			AddBinding(nameof(VideoConfig.OverscanBottom), nudOverscanBottom);
 		}
 
 		protected override bool ValidateInput()
@@ -123,5 +128,24 @@ namespace Mesen.GUI.Forms.Config
 		{
 			SetNtscPreset(0, -100, 0, 0, 20, 0, 70, -20, -20, -10, 15, false);
 		}
+
+		private void UpdateOverscanImage(PictureBox picture, int top, int bottom, int left, int right)
+		{
+			Bitmap overscan = new Bitmap(picture.Width - 2, picture.Height - 2);
+
+			using(Graphics g = Graphics.FromImage(overscan)) {
+				g.Clear(Color.DarkGray);
+
+				Rectangle fg = new Rectangle(left, top, 256 - left - right, 240 - top - bottom);
+				g.ScaleTransform((float)overscan.Width / 256, (float)overscan.Height / 240);
+				g.FillRectangle(Brushes.LightCyan, fg);
+			}
+			picture.Image = overscan;
+		}
+
+		private void nudOverscan_ValueChanged(object sender, EventArgs e)
+		{
+			UpdateOverscanImage(picOverscan, (int)nudOverscanTop.Value, (int)nudOverscanBottom.Value, (int)nudOverscanLeft.Value, (int)nudOverscanRight.Value);
+		}
 	}
 }

UI/Forms/frmMain.cs

@@ -57,7 +57,7 @@ namespace Mesen.GUI.Forms
 			ConfigManager.Config.ApplyConfig();
 
 			_displayManager = new DisplayManager(this, ctrlRenderer, pnlRenderer);
-			_displayManager.UpdateViewerSize(false);
+			_displayManager.UpdateViewerSize();
 			_shortcuts = new ShortcutHandler(_displayManager);
 
 			_notifListener = new NotificationListener();
@@ -112,6 +112,12 @@ namespace Mesen.GUI.Forms
 					}));
 					break;
 
+				case ConsoleNotificationType.ResolutionChanged:
+					this.BeginInvoke((Action)(() => {
+						_displayManager.UpdateViewerSize();
+					}));
+					break;
+
 				case ConsoleNotificationType.ExecuteShortcut:
 					this.BeginInvoke((Action)(() => {
 						_shortcuts.ExecuteShortcut((EmulatorShortcut)e.Parameter);