1 files changed, 40 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/core/layout/svg/transformed_hit_test_location.cc b/chromium/third_party/blink/renderer/core/layout/svg/transformed_hit_test_location.cc
new file mode 100644
index 00000000000..a576fcbae17
--- /dev/null
+++ b/chromium/third_party/blink/renderer/core/layout/svg/transformed_hit_test_location.cc
@@ -0,0 +1,40 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "third_party/blink/renderer/core/layout/svg/transformed_hit_test_location.h"
+
+#include "third_party/blink/renderer/platform/transforms/affine_transform.h"
+
+namespace blink {
+
+namespace {
+
+const HitTestLocation* InverseTransformLocationIfNeeded(
+    const HitTestLocation& location,
+    const AffineTransform& transform,
+    base::Optional<HitTestLocation>& storage) {
+  if (transform.IsIdentity())
+    return &location;
+  if (!transform.IsInvertible())
+    return nullptr;
+  const AffineTransform inverse = transform.Inverse();
+  FloatPoint transformed_point = inverse.MapPoint(location.TransformedPoint());
+  if (UNLIKELY(location.IsRectBasedTest())) {
+    storage.emplace(transformed_point,
+                    inverse.MapQuad(location.TransformedRect()));
+  } else {
+    storage.emplace(transformed_point);
+  }
+  return &*storage;
+}
+
+}  // namespace
+
+TransformedHitTestLocation::TransformedHitTestLocation(
+    const HitTestLocation& location,
+    const AffineTransform& transform)
+    : location_(
+          InverseTransformLocationIfNeeded(location, transform, storage_)) {}
+
+}  // namespace blink