macos: colorized Ghostty icon begins!

macos/Assets.xcassets/Custom Icon/Contents.json

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

macos/Assets.xcassets/Custom Icon/CustomIconBase.imageset/Contents.json

@@ -0,0 +1,15 @@
+{
+  "images" : [
+    {
+      "filename" : "base.png",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "template-rendering-intent" : "original"
+  }
+}

macos/Assets.xcassets/Custom Icon/CustomIconCRT.imageset/Contents.json

@@ -0,0 +1,15 @@
+{
+  "images" : [
+    {
+      "filename" : "crt-effect.png",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "template-rendering-intent" : "original"
+  }
+}

macos/Assets.xcassets/Custom Icon/CustomIconGhost.imageset/Contents.json

@@ -0,0 +1,15 @@
+{
+  "images" : [
+    {
+      "filename" : "ghosty.png",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "template-rendering-intent" : "template"
+  }
+}

macos/Assets.xcassets/Custom Icon/CustomIconGloss.imageset/Contents.json

@@ -0,0 +1,15 @@
+{
+  "images" : [
+    {
+      "filename" : "gloss.png",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "template-rendering-intent" : "original"
+  }
+}

macos/Assets.xcassets/Custom Icon/CustomIconScreen.imageset/Contents.json

@@ -0,0 +1,15 @@
+{
+  "images" : [
+    {
+      "filename" : "screen-dark.png",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "template-rendering-intent" : "original"
+  }
+}

macos/Assets.xcassets/Custom Icon/CustomIconScreenMask.imageset/Contents.json

@@ -0,0 +1,15 @@
+{
+  "images" : [
+    {
+      "filename" : "screen-mask.png",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "template-rendering-intent" : "original"
+  }
+}

macos/Ghostty.xcodeproj/project.pbxproj

@@ -39,6 +39,9 @@
 		A53D0C952B53B4D800305CE6 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = A5B30538299BEAAB0047F10C /* Assets.xcassets */; };
 		A53D0C9B2B543F3B00305CE6 /* Ghostty.App.swift in Sources */ = {isa = PBXBuildFile; fileRef = A53D0C992B543F3B00305CE6 /* Ghostty.App.swift */; };
 		A53D0C9C2B543F7B00305CE6 /* Package.swift in Sources */ = {isa = PBXBuildFile; fileRef = A55B7BB729B6F53A0055DE60 /* Package.swift */; };
+		A54B0CE92D0CECD100CBEFF8 /* ColorizedGhosttyIconView.swift in Sources */ = {isa = PBXBuildFile; fileRef = A54B0CE82D0CECD100CBEFF8 /* ColorizedGhosttyIconView.swift */; };
+		A54B0CEB2D0CFB4C00CBEFF8 /* NSImage+Extension.swift in Sources */ = {isa = PBXBuildFile; fileRef = A54B0CEA2D0CFB4A00CBEFF8 /* NSImage+Extension.swift */; };
+		A54B0CED2D0CFB7700CBEFF8 /* ColorizedGhosttyIcon.swift in Sources */ = {isa = PBXBuildFile; fileRef = A54B0CEC2D0CFB7300CBEFF8 /* ColorizedGhosttyIcon.swift */; };
 		A54D786C2CA7978E001B19B1 /* BaseTerminalController.swift in Sources */ = {isa = PBXBuildFile; fileRef = A54D786B2CA79788001B19B1 /* BaseTerminalController.swift */; };
 		A55685E029A03A9F004303CE /* AppError.swift in Sources */ = {isa = PBXBuildFile; fileRef = A55685DF29A03A9F004303CE /* AppError.swift */; };
 		A55B7BB829B6F53A0055DE60 /* Package.swift in Sources */ = {isa = PBXBuildFile; fileRef = A55B7BB729B6F53A0055DE60 /* Package.swift */; };
@@ -124,6 +127,9 @@
 		A53A6C022CCC1B7D00943E98 /* Ghostty.Action.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Ghostty.Action.swift; sourceTree = "<group>"; };
 		A53D0C932B53B43700305CE6 /* iOSApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = iOSApp.swift; sourceTree = "<group>"; };
 		A53D0C992B543F3B00305CE6 /* Ghostty.App.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Ghostty.App.swift; sourceTree = "<group>"; };
+		A54B0CE82D0CECD100CBEFF8 /* ColorizedGhosttyIconView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ColorizedGhosttyIconView.swift; sourceTree = "<group>"; };
+		A54B0CEA2D0CFB4A00CBEFF8 /* NSImage+Extension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "NSImage+Extension.swift"; sourceTree = "<group>"; };
+		A54B0CEC2D0CFB7300CBEFF8 /* ColorizedGhosttyIcon.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ColorizedGhosttyIcon.swift; sourceTree = "<group>"; };
 		A54D786B2CA79788001B19B1 /* BaseTerminalController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BaseTerminalController.swift; sourceTree = "<group>"; };
 		A55685DF29A03A9F004303CE /* AppError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppError.swift; sourceTree = "<group>"; };
 		A55B7BB729B6F53A0055DE60 /* Package.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Package.swift; sourceTree = "<group>"; };
@@ -237,6 +243,7 @@
 				A57D79252C9C8782001D522E /* Secure Input */,
 				A534263E2A7DCC5800EBB7A2 /* Settings */,
 				A51BFC1C2B2FB5AB00E92F16 /* About */,
+				A54B0CE72D0CEC9800CBEFF8 /* Colorized Ghostty Icon */,
 				A51BFC292B30F69F00E92F16 /* Update */,
 			);
 			path = Features;
@@ -256,6 +263,7 @@
 				A5CBD0552C9E65A50017A1AE /* DraggableWindowView.swift */,
 				C159E81C2B66A06B00FDFE9C /* OSColor+Extension.swift */,
 				A599CDAF2CF103F20049FA26 /* NSAppearance+Extension.swift */,
+				A54B0CEA2D0CFB4A00CBEFF8 /* NSImage+Extension.swift */,
 				A52FFF5C2CAB4D05000C6A5B /* NSScreen+Extension.swift */,
 				C1F26EA62B738B9900404083 /* NSView+Extension.swift */,
 				AEE8B3442B9AA39600260C5E /* NSPasteboard+Extension.swift */,
@@ -307,6 +315,15 @@
 			path = macOS;
 			sourceTree = "<group>";
 		};
+		A54B0CE72D0CEC9800CBEFF8 /* Colorized Ghostty Icon */ = {
+			isa = PBXGroup;
+			children = (
+				A54B0CEC2D0CFB7300CBEFF8 /* ColorizedGhosttyIcon.swift */,
+				A54B0CE82D0CECD100CBEFF8 /* ColorizedGhosttyIconView.swift */,
+			);
+			path = "Colorized Ghostty Icon";
+			sourceTree = "<group>";
+		};
 		A54CD6ED299BEB14008C95BB /* Sources */ = {
 			isa = PBXGroup;
 			children = (
@@ -580,8 +597,10 @@
 			files = (
 				A59630A42AF059BB00D64628 /* Ghostty.SplitNode.swift in Sources */,
 				A514C8D62B54A16400493A16 /* Ghostty.Config.swift in Sources */,
+				A54B0CEB2D0CFB4C00CBEFF8 /* NSImage+Extension.swift in Sources */,
 				A54D786C2CA7978E001B19B1 /* BaseTerminalController.swift in Sources */,
 				A59FB5CF2AE0DB50009128F3 /* InspectorView.swift in Sources */,
+				A54B0CE92D0CECD100CBEFF8 /* ColorizedGhosttyIconView.swift in Sources */,
 				A5D0AF3D2B37804400D21823 /* CodableBridge.swift in Sources */,
 				A5D0AF3B2B36A1DE00D21823 /* TerminalRestorable.swift in Sources */,
 				C1F26EA72B738B9900404083 /* NSView+Extension.swift in Sources */,
@@ -620,6 +639,7 @@
 				A5CEAFDC29B8009000646FDA /* SplitView.swift in Sources */,
 				A5CDF1932AAF9E0800513312 /* ConfigurationErrorsController.swift in Sources */,
 				A53A6C032CCC1B7F00943E98 /* Ghostty.Action.swift in Sources */,
+				A54B0CED2D0CFB7700CBEFF8 /* ColorizedGhosttyIcon.swift in Sources */,
 				A59FB5D12AE0DEA7009128F3 /* MetalView.swift in Sources */,
 				A55685E029A03A9F004303CE /* AppError.swift in Sources */,
 				A599CDB02CF103F60049FA26 /* NSAppearance+Extension.swift in Sources */,

macos/Sources/App/macOS/AppDelegate.swift

@@ -519,6 +519,13 @@ class AppDelegate: NSObject,
         } else {
             GlobalEventTap.shared.disable()
         }
+
+        if let colorizedIcon = ColorizedGhosttyIcon(
+            screenColors: [.purple, .blue],
+            ghostColor: .yellow
+        ).makeImage() {
+            NSApplication.shared.applicationIconImage = colorizedIcon
+        }
     }
 
     /// Sync the appearance of our app with the theme specified in the config.

macos/Sources/Features/Colorized Ghostty Icon/ColorizedGhosttyIcon.swift

@@ -0,0 +1,45 @@
+import Cocoa
+
+struct ColorizedGhosttyIcon {
+    /// The colors that make up the gradient of the screen.
+    let screenColors: [NSColor]
+
+    /// The color of the ghost.
+    let ghostColor: NSColor
+
+    /// Make a custom colorized ghostty icon.
+    func makeImage() -> NSImage? {
+        // All of our layers (in order)
+        guard let base = NSImage(named: "CustomIconBase") else { return nil }
+        guard let screen = NSImage(named: "CustomIconScreen") else { return nil }
+        guard let screenMask = NSImage(named: "CustomIconScreenMask") else { return nil }
+        guard let ghost = NSImage(named: "CustomIconGhost") else { return nil }
+        guard let crt = NSImage(named: "CustomIconCRT") else { return nil }
+        guard let gloss = NSImage(named: "CustomIconGloss") else { return nil }
+
+        // Apply our color in various ways to our layers.
+        // NOTE: These functions are not built-in, they're implemented as an extension
+        // to NSImage in NSImage+Extension.swift.
+        guard let screenGradient = screenMask.gradient(colors: screenColors) else { return nil }
+        guard let tintedGhost = ghost.tint(color: ghostColor) else { return nil }
+
+        // Combine our layers using the proper blending modes
+        return.combine(images: [
+            base,
+            screen,
+            screenGradient,
+            ghost,
+            tintedGhost,
+            crt,
+            gloss,
+        ], blendingModes: [
+            .normal,
+            .normal,
+            .color,
+            .normal,
+            .color,
+            .overlay,
+            .normal,
+        ])
+    }
+}

macos/Sources/Features/Colorized Ghostty Icon/ColorizedGhosttyIconView.swift

@@ -0,0 +1,12 @@
+import SwiftUI
+import Cocoa
+
+// For testing.
+struct ColorizedGhosttyIconView: View {
+    var body: some View {
+        Image(nsImage: ColorizedGhosttyIcon(
+            screenColors: [.purple, .blue],
+            ghostColor: .yellow
+        ).makeImage()!)
+    }
+}

macos/Sources/Helpers/NSImage+Extension.swift

@@ -0,0 +1,90 @@
+import Cocoa
+
+extension NSImage {
+    /// Combine multiple images with the given blend modes. This is useful given a set
+    /// of layers to create a final rasterized image.
+    static func combine(images: [NSImage], blendingModes: [CGBlendMode]) -> NSImage? {
+        guard images.count == blendingModes.count else { return nil }
+        guard images.count > 0 else { return nil }
+
+        // The final size will be the same size as our first image.
+        let size = images.first!.size
+
+        // Create a bitmap context manually
+        guard let bitmapContext = CGContext(
+            data: nil,
+            width: Int(size.width),
+            height: Int(size.height),
+            bitsPerComponent: 8,
+            bytesPerRow: 0,
+            space: CGColorSpaceCreateDeviceRGB(),
+            bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue
+        ) else { return nil }
+
+        // Clear the context
+        bitmapContext.setFillColor(.clear)
+        bitmapContext.fill(.init(origin: .zero, size: size))
+
+        // Draw each image with its corresponding blend mode
+        for (index, image) in images.enumerated() {
+            guard let cgImage = image.cgImage(
+                forProposedRect: nil,
+                context: nil,
+                hints: nil
+            ) else { return nil }
+
+            let blendMode = blendingModes[index]
+            bitmapContext.setBlendMode(blendMode)
+            bitmapContext.draw(cgImage, in: CGRect(origin: .zero, size: size))
+        }
+
+        // Create a CGImage from the context
+        guard let combinedCGImage = bitmapContext.makeImage() else { return nil }
+
+        // Wrap the CGImage in an NSImage
+        return NSImage(cgImage: combinedCGImage, size: size)
+    }
+
+    /// Apply a gradient onto this image, using this image as a mask.
+    func gradient(colors: [NSColor]) -> NSImage? {
+        let resultImage = NSImage(size: size)
+        resultImage.lockFocus()
+        defer { resultImage.unlockFocus() }
+
+        // Draw the gradient
+        guard let gradient = NSGradient(colors: colors) else { return nil }
+        gradient.draw(in: .init(origin: .zero, size: size), angle: 90)
+
+        // Apply the mask
+        draw(at: .zero, from: .zero, operation: .destinationIn, fraction: 1.0)
+
+        return resultImage
+    }
+
+    // Tint an NSImage with the given color by applying a basic fill on top of it.
+    func tint(color: NSColor) -> NSImage? {
+        // Create a new image with the same size as the base image
+        let newImage = NSImage(size: size)
+
+        // Draw into the new image
+        newImage.lockFocus()
+        defer { newImage.unlockFocus() }
+
+        // Set up the drawing context
+        guard let context = NSGraphicsContext.current?.cgContext else { return nil }
+        defer { context.restoreGState() }
+
+        // Draw the base image
+        guard let cgImage = cgImage(forProposedRect: nil, context: nil, hints: nil) else { return nil }
+        context.draw(cgImage, in: .init(origin: .zero, size: size))
+
+        // Set the tint color and blend mode
+        context.setFillColor(color.cgColor)
+        context.setBlendMode(.sourceAtop)
+
+        // Apply the tint color over the entire image
+        context.fill(.init(origin: .zero, size: size))
+
+        return newImage
+    }
+}