Fix terminal background rendering

Assets.xcassets/AppIcon-Debug.appiconset/Contents.json

@@ -0,0 +1,68 @@
+{
+  "images" : [
+    {
+      "filename" : "16.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : "16@2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : "32.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : "32@2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : "128.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : "128@2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : "256.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : "256@2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : "512.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "filename" : "512@2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,68 @@
+{
+  "images" : [
+    {
+      "filename" : "16.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : "16@2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : "32.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : "32@2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : "128.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : "128@2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : "256.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : "256@2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : "512.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "filename" : "512@2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

GhosttyTabs.xcodeproj/project.pbxproj

@@ -20,6 +20,7 @@
 		A50010A4 /* SplitTree.swift in Sources */ = {isa = PBXBuildFile; fileRef = A50010A0 /* SplitTree.swift */; };
 		A50010A5 /* SplitView.swift in Sources */ = {isa = PBXBuildFile; fileRef = A50010A1 /* SplitView.swift */; };
 		A50010A6 /* TerminalSplitTreeView.swift in Sources */ = {isa = PBXBuildFile; fileRef = A50010A2 /* TerminalSplitTreeView.swift */; };
+		A5001100 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = A5001101 /* Assets.xcassets */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -52,6 +53,7 @@
 		A50010A0 /* SplitTree.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Splits/SplitTree.swift; sourceTree = "<group>"; };
 		A50010A1 /* SplitView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Splits/SplitView.swift; sourceTree = "<group>"; };
 		A50010A2 /* TerminalSplitTreeView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Splits/TerminalSplitTreeView.swift; sourceTree = "<group>"; };
+		A5001101 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -65,11 +67,23 @@
 		};
 /* End PBXFrameworksBuildPhase section */
 
+/* Begin PBXResourcesBuildPhase section */
+		A5001102 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				A5001100 /* Assets.xcassets in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
 /* Begin PBXGroup section */
 		A5001040 = {
 			isa = PBXGroup;
 			children = (
 				A5001041 /* Sources */,
+				A5001101 /* Assets.xcassets */,
 				A5001016 /* GhosttyKit.xcframework */,
 				A5001017 /* ghostty.h */,
 				A5001018 /* GhosttyTabs-Bridging-Header.h */,
@@ -113,6 +127,7 @@
 			buildPhases = (
 				A5001051 /* Sources */,
 				A5001030 /* Frameworks */,
+				A5001102 /* Resources */,
 				A5001020 /* Embed Frameworks */,
 			);
 			buildRules = (
@@ -239,7 +254,7 @@
 		A5001082 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_APPICON_NAME = "AppIcon-Debug";
 				CODE_SIGN_ENTITLEMENTS = "";
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;

Sources/GhosttyTerminalView.swift

@@ -107,7 +107,7 @@ class GhosttyApp {
         runtimeConfig.supports_selection_clipboard = true
         runtimeConfig.wakeup_cb = { userdata in
             DispatchQueue.main.async {
-                // Wakeup - trigger redraw if needed
+                GhosttyApp.shared.tick()
             }
         }
         runtimeConfig.action_cb = { app, target, action in
@@ -211,6 +211,7 @@ class GhosttyApp {
     func tick() {
         guard let app = app else { return }
         ghostty_app_tick(app)
+        AppDelegate.shared?.tabManager?.tickRender()
     }
 
     private func updateDefaultBackground(from config: ghostty_config_t?) {
@@ -447,6 +448,7 @@ class GhosttyApp {
                     blue: CGFloat(change.b) / 255,
                     alpha: 1.0
                 )
+                surfaceView.applySurfaceBackground()
                 if backgroundLogEnabled {
                     logBackground("OSC background change tab=\(surfaceView.tabId?.uuidString ?? "unknown") color=\(surfaceView.backgroundColor?.description ?? "nil")")
                 }
@@ -559,11 +561,13 @@ class TerminalSurface: Identifiable {
             return
         }
 
+        ghostty_surface_set_content_scale(surface, scale, scale)
         ghostty_surface_set_size(
             surface,
             UInt32(view.bounds.width * scale),
             UInt32(view.bounds.height * scale)
         )
+        ghostty_surface_refresh(surface)
 
         setupDisplayLink()
     }
@@ -603,7 +607,9 @@ class TerminalSurface: Identifiable {
 
     func updateSize(width: CGFloat, height: CGFloat, scale: CGFloat) {
         guard let surface = surface else { return }
+        ghostty_surface_set_content_scale(surface, scale, scale)
         ghostty_surface_set_size(surface, UInt32(width * scale), UInt32(height * scale))
+        ghostty_surface_refresh(surface)
 
         if let view = attachedView, let metalLayer = view.layer as? CAMetalLayer {
             metalLayer.contentsScale = scale
@@ -611,6 +617,12 @@ class TerminalSurface: Identifiable {
         }
     }
 
+    func renderIfVisible() {
+        guard let view = attachedView else { return }
+        guard view.window != nil, view.bounds.width > 0, view.bounds.height > 0 else { return }
+        ghostty_surface_draw(surface)
+    }
+
     func applyWindowBackgroundIfActive() {
         surfaceView.applyWindowBackgroundIfActive()
     }
@@ -678,11 +690,20 @@ class GhosttyNSView: NSView, NSUserInterfaceValidations {
         return base.withAlphaComponent(opacity)
     }
 
+    func applySurfaceBackground() {
+        let color = effectiveBackgroundColor()
+        if let metalLayer = layer as? CAMetalLayer {
+            metalLayer.backgroundColor = color.cgColor
+            metalLayer.isOpaque = color.alphaComponent >= 1.0
+        }
+    }
+
     func applyWindowBackgroundIfActive() {
         guard let window else { return }
         if let tabId, let selectedId = AppDelegate.shared?.tabManager?.selectedTabId, tabId != selectedId {
             return
         }
+        applySurfaceBackground()
         let color = effectiveBackgroundColor()
         window.backgroundColor = color
         window.isOpaque = color.alphaComponent >= 1.0
@@ -745,10 +766,16 @@ class GhosttyNSView: NSView, NSUserInterfaceValidations {
         if window != nil {
             attachSurfaceIfNeeded()
             updateSurfaceSize()
+            applySurfaceBackground()
             applyWindowBackgroundIfActive()
         }
     }
 
+    override func viewDidChangeBackingProperties() {
+        super.viewDidChangeBackingProperties()
+        updateSurfaceSize()
+    }
+
     override func setFrameSize(_ newSize: NSSize) {
         super.setFrameSize(newSize)
         attachSurfaceIfNeeded()

Sources/TabManager.swift

@@ -204,6 +204,14 @@ class TabManager: ObservableObject {
         })
     }
 
+    func tickRender() {
+        for tab in tabs {
+            for surface in tab.splitTree.map({ $0 }) {
+                surface.renderIfVisible()
+            }
+        }
+    }
+
     func addTab() {
         let newTab = Tab(title: "Terminal \(tabs.count + 1)")
         tabs.append(newTab)