UI: Avoid excessive config reads when drawing preview

UI/window-basic-main.cpp

@@ -488,6 +488,7 @@ OBSBasic::OBSBasic(QWidget *parent)
 
 	UpdatePreviewSafeAreas();
 	UpdatePreviewSpacingHelpers();
+	UpdatePreviewOverflowSettings();
 }
 
 static void SaveAudioDevice(const char *name, int channel, obs_data_t *parent,
@@ -10294,6 +10295,20 @@ void OBSBasic::UpdatePreviewSafeAreas()
 					"ShowSafeAreas");
 }
 
+void OBSBasic::UpdatePreviewOverflowSettings()
+{
+	bool hidden = config_get_bool(App()->GlobalConfig(), "BasicWindow",
+				      "OverflowHidden");
+	bool select = config_get_bool(App()->GlobalConfig(), "BasicWindow",
+				      "OverflowSelectionHidden");
+	bool always = config_get_bool(App()->GlobalConfig(), "BasicWindow",
+				      "OverflowAlwaysVisible");
+
+	ui->preview->SetOverflowHidden(hidden);
+	ui->preview->SetOverflowSelectionHidden(select);
+	ui->preview->SetOverflowAlwaysVisible(always);
+}
+
 void OBSBasic::SetDisplayAffinity(QWindow *window)
 {
 	if (!SetDisplayAffinitySupported())

UI/window-basic-main.hpp

@@ -643,6 +643,8 @@ private:
 	std::string lastScreenshot;
 	std::string lastReplay;
 
+	void UpdatePreviewOverflowSettings();
+
 public slots:
 	void DeferSaveBegin();
 	void DeferSaveEnd();

UI/window-basic-preview.cpp

@@ -1868,10 +1868,9 @@ bool OBSBasicPreview::DrawSelectedOverflow(obs_scene_t *scene,
 	if (!SceneItemHasVideo(item))
 		return true;
 
-	bool select = config_get_bool(GetGlobalConfig(), "BasicWindow",
-				      "OverflowSelectionHidden");
+	OBSBasicPreview *prev = reinterpret_cast<OBSBasicPreview *>(param);
 
-	if (!select && !obs_sceneitem_visible(item))
+	if (!prev->GetOverflowSelectionHidden() && !obs_sceneitem_visible(item))
 		return true;
 
 	if (obs_sceneitem_is_group(item)) {
@@ -1885,14 +1884,9 @@ bool OBSBasicPreview::DrawSelectedOverflow(obs_scene_t *scene,
 		gs_matrix_pop();
 	}
 
-	bool always = config_get_bool(GetGlobalConfig(), "BasicWindow",
-				      "OverflowAlwaysVisible");
-
-	if (!always && !obs_sceneitem_selected(item))
+	if (!prev->GetOverflowAlwaysVisible() && !obs_sceneitem_selected(item))
 		return true;
 
-	OBSBasicPreview *prev = reinterpret_cast<OBSBasicPreview *>(param);
-
 	matrix4 boxTransform;
 	matrix4 invBoxTransform;
 	obs_sceneitem_get_box_transform(item, &boxTransform);
@@ -2177,10 +2171,7 @@ void OBSBasicPreview::DrawOverflow()
 	if (locked)
 		return;
 
-	bool hidden = config_get_bool(GetGlobalConfig(), "BasicWindow",
-				      "OverflowHidden");
-
-	if (hidden)
+	if (overflowHidden)
 		return;
 
 	GS_DEBUG_MARKER_BEGIN(GS_DEBUG_COLOR_DEFAULT, "DrawOverflow");

UI/window-basic-preview.hpp

@@ -73,6 +73,9 @@ private:
 	bool scrollMode = false;
 	bool fixedScaling = false;
 	bool selectionBox = false;
+	bool overflowHidden = false;
+	bool overflowSelectionHidden = false;
+	bool overflowAlwaysVisible = false;
 	int32_t scalingLevel = 0;
 	float scalingAmount = 1.0f;
 	float groupRot = 0.0f;
@@ -162,6 +165,25 @@ public:
 	inline float GetScrollX() const { return scrollingOffset.x; }
 	inline float GetScrollY() const { return scrollingOffset.y; }
 
+	inline void SetOverflowHidden(bool hidden) { overflowHidden = hidden; }
+	inline void SetOverflowSelectionHidden(bool hidden)
+	{
+		overflowSelectionHidden = hidden;
+	}
+	inline void SetOverflowAlwaysVisible(bool visible)
+	{
+		overflowAlwaysVisible = visible;
+	}
+
+	inline bool GetOverflowSelectionHidden() const
+	{
+		return overflowSelectionHidden;
+	}
+	inline bool GetOverflowAlwaysVisible() const
+	{
+		return overflowAlwaysVisible;
+	}
+
 	/* use libobs allocator for alignment because the matrices itemToScreen
 	 * and screenToItem may contain SSE data, which will cause SSE
 	 * instructions to crash if the data is not aligned to at least a 16

UI/window-basic-settings.cpp

@@ -3170,18 +3170,20 @@ void OBSBasicSettings::SaveGeneralSettings()
 	if (WidgetChanged(ui->snapDistance))
 		config_set_double(GetGlobalConfig(), "BasicWindow",
 				  "SnapDistance", ui->snapDistance->value());
-	if (WidgetChanged(ui->overflowAlwaysVisible))
+	if (WidgetChanged(ui->overflowAlwaysVisible) ||
+	    WidgetChanged(ui->overflowHide) ||
+	    WidgetChanged(ui->overflowSelectionHide)) {
 		config_set_bool(GetGlobalConfig(), "BasicWindow",
 				"OverflowAlwaysVisible",
 				ui->overflowAlwaysVisible->isChecked());
-	if (WidgetChanged(ui->overflowHide))
 		config_set_bool(GetGlobalConfig(), "BasicWindow",
 				"OverflowHidden",
 				ui->overflowHide->isChecked());
-	if (WidgetChanged(ui->overflowSelectionHide))
 		config_set_bool(GetGlobalConfig(), "BasicWindow",
 				"OverflowSelectionHidden",
 				ui->overflowSelectionHide->isChecked());
+		main->UpdatePreviewOverflowSettings();
+	}
 	if (WidgetChanged(ui->previewSafeAreas)) {
 		config_set_bool(GetGlobalConfig(), "BasicWindow",
 				"ShowSafeAreas",