Anti-alias downscaled screenshots in the result window

Full-res retina captures are downscaled to fit the window; nearest-neighbor
made them look chunky. Use high-quality interpolation when shrinking, keep
pixel-crisp rendering only when upscaling small selections.

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4-flash-0731

Sources/Kapture/CaptureController.swift

@@ -86,8 +86,10 @@ final class ScreenCapture {
 
     @available(macOS 14.0, *)
     private func crop(_ image: CGImage, to rect: NSRect, display: SCDisplay) -> CGImage? {
-        let scaleX = CGFloat(display.width) / display.frame.width
-        let scaleY = CGFloat(display.height) / display.frame.height
+        // Scale from the actual captured image dimensions, which reflect the
+        // stream's pixel output (retina => 2x, non-retina => 1x).
+        let scaleX = CGFloat(image.width) / display.frame.width
+        let scaleY = CGFloat(image.height) / display.frame.height
         let cgRect = CGRect(
             x: rect.minX,
             y: rect.minY,
@@ -133,8 +135,13 @@ final class ScreenCapture {
                 let excluded = content.windows.filter { excludedSet.contains($0.windowID) }
                 let filter = SCContentFilter(display: display, excludingWindows: excluded)
                 let config = SCStreamConfiguration()
-                config.width = Int(display.width)
-                config.height = Int(display.height)
+                // width/height are in points. Use the display's backing scale so
+                // retina captures come out at full pixel resolution.
+                let backingScale = NSScreen.screens.first(where: { $0.frame.contains(
+                    NSPoint(x: rect.midX, y: rect.midY)
+                ) })?.backingScaleFactor ?? 2
+                config.width = Int(display.frame.width * backingScale)
+                config.height = Int(display.frame.height * backingScale)
                 config.showsCursor = true
 
                 guard let image = try? await SCScreenshotManager.captureImage(contentFilter: filter, configuration: config) else {

Sources/Kapture/ResultWindow.swift

@@ -193,10 +193,14 @@ struct ResultView: View {
             .padding(.top, 10)
 
             if model.mode == .screenshot {
+                GeometryReader { geo in
+                    let imageWidth = CGFloat(model.image.width)
                     Image(nsImage: NSImage(cgImage: model.image, size: .zero))
                         .resizable()
-                    .interpolation(.none)
+                        // Downscale with smoothing (AA); upscale keeps pixels crisp.
+                        .interpolation(imageWidth >= geo.size.width ? .high : .none)
                         .aspectRatio(contentMode: .fit)
+                }
                 .border(Color.secondary.opacity(0.4))
                 .padding(.horizontal, 12)
             } else {

build-app.sh

@@ -108,9 +108,9 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
     <key>CFBundleIconFile</key>
     <string>Icon</string>
     <key>CFBundleShortVersionString</key>
-    <string>1.1.1</string>
+    <string>1.1.3</string>
     <key>CFBundleVersion</key>
-    <string>11</string>
+    <string>13</string>
     <key>LSUIElement</key>
     <true/>
     <key>NSHighResolutionCapable</key>