Fix TransformLayer with perspective transform (#49441)

10649ac4 · Tong Mu · Flutter GitHub Bot · 6a7fac22 · 10649ac4 · 10649ac4
Commit 10649ac4 authored Jan 25, 2020 by Tong Mu Committed by Flutter GitHub Bot Jan 25, 2020
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Showing with 120 additions and 30 deletions

layer.dart packages/flutter/lib/src/rendering/layer.dart +2 -3

layer_annotations_test.dart packages/flutter/test/rendering/layer_annotations_test.dart +118 -27

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--- a/packages/flutter/lib/src/rendering/layer.dart
+++ b/packages/flutter/lib/src/rendering/layer.dart
@@ -1655,9 +1655,8 @@ class TransformLayer extends OffsetLayer {
    }
    if (_invertedTransform == null)
      return null;
-    final Vector4 vector = Vector4(localPosition.dx, localPosition.dy, 0.0, 1.0);
-    final Vector4 result = _invertedTransform.transform(vector);
-    return Offset(result[0], result[1]);
+
+    return MatrixUtils.transformPoint(_invertedTransform, localPosition);
  }

  @override

--- a/packages/flutter/test/rendering/layer_annotations_test.dart
+++ b/packages/flutter/test/rendering/layer_annotations_test.dart