Add a Rect.largest constructor equivalent to SkRect::MakeLargest (flutter/engine#4520)

2018-01-05 13:37:23 -08:00
parent 18d27b3e67
commit fadef9db2f
1 changed files with 10 additions and 0 deletions
--- 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);