The Garage SDKs, in the open

garage_auth, garage_entitlements, garage_iap and garage_ui, moved out of
Garage-Services and Metro-Map-Maker into one public repo. MIT, one readme,
docs under docs/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013F4NWNvYcdeSgqbWMT1VQ7

garage_ui/lib/platform/eyedropper_native.dart

@@ -0,0 +1,48 @@
+import "package:flutter/foundation.dart";
+import "package:flutter/services.dart";
+import "package:flutter/widgets.dart";
+
+// macOS side of the eyedropper. Everything else that isnt web lands here too
+// and simply reports "no native sampler", which is the honest answer - theres
+// no handler registered on windows/linux/ios/android.
+
+const _channel = MethodChannel("garage/eyedropper");
+
+bool? _cachedAvailability;
+
+Future<bool> nativeEyedropperAvailable() async {
+  if (_cachedAvailability != null) return _cachedAvailability!;
+
+  if (defaultTargetPlatform != TargetPlatform.macOS) {
+    _cachedAvailability = false;
+    return false;
+  }
+  try {
+    _cachedAvailability = await _channel.invokeMethod<bool>("isAvailable");
+  } catch (error, stack) {
+    // an older macOS (or a runner thats never been rebuilt with the swift
+    // side in it) - not fatal, we just fall back to in-app sampling.
+    debugPrint("eyedropper: isAvailable failed: $error\n$stack");
+    _cachedAvailability = false;
+  }
+  return _cachedAvailability ?? false;
+}
+
+Future<Color?> pickNativeScreenColor() async {
+  try {
+    final picked = await _channel.invokeMapMethod<String, int>("pick");
+    if (picked == null) return null;
+
+    final r = picked["r"];
+    final g = picked["g"];
+    final b = picked["b"];
+    if (r == null || g == null || b == null) {
+      debugPrint("eyedropper: native pick returned a malformed colour $picked");
+      return null;
+    }
+    return Color.fromARGB(255, r, g, b);
+  } catch (error, stack) {
+    debugPrint("eyedropper: native pick failed: $error\n$stack");
+    return null;
+  }
+}