From fadef9db2ff8b7c12aa6953ec201bd22c0ce824d Mon Sep 17 00:00:00 2001
From: Jason Simmons <jason-simmons@users.noreply.github.com>
Date: Fri, 5 Jan 2018 13:37:23 -0800
Subject: [PATCH] Add a Rect.largest constructor equivalent to
 SkRect::MakeLargest (flutter/engine#4520)

---
 engine/src/flutter/lib/ui/geometry.dart | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/engine/src/flutter/lib/ui/geometry.dart b/engine/src/flutter/lib/ui/geometry.dart
index e4bb57ec509..2f7b03d67cd 100644
--- a/engine/src/flutter/lib/ui/geometry.dart
+++ b/engine/src/flutter/lib/ui/geometry.dart
@@ -596,6 +596,16 @@ class Rect {
       ..[3] = math.max(a.dy, b.dy);
   }
 
+  /// Construct the largest finite rectangle.
+  Rect.largest() {
+    const double skScalarMax = 3.402823466e+38; // from Skia's SkScalar.h
+    _value
+      ..[0] = -skScalarMax
+      ..[1] = -skScalarMax
+      ..[2] = skScalarMax
+      ..[3] = skScalarMax;
+  }
+
   static const int _kDataSize = 4;
   final Float32List _value = new Float32List(_kDataSize);