1 files changed, 67 insertions, 0 deletions
diff --git a/layout/mathml/nsMathMLmrootFrame.h b/layout/mathml/nsMathMLmrootFrame.h
new file mode 100644
index 0000000000..b12010b8e3
--- /dev/null
+++ b/layout/mathml/nsMathMLmrootFrame.h
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsMathMLmrootFrame_h___
+#define nsMathMLmrootFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsMathMLContainerFrame.h"
+#include "nsMathMLChar.h"
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+//
+// <msqrt> and <mroot> -- form a radical
+//
+
+class nsMathMLmrootFrame final : public nsMathMLContainerFrame {
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmrootFrame)
+
+  friend nsIFrame* NS_NewMathMLmrootFrame(mozilla::PresShell* aPresShell,
+                                          ComputedStyle* aStyle);
+
+  void DidSetComputedStyle(ComputedStyle* aOldStyle) override;
+
+  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
+                    nsIFrame* aPrevInFlow) override;
+
+  NS_IMETHOD
+  TransmitAutomaticData() override;
+
+  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+                      const ReflowInput& aReflowInput,
+                      nsReflowStatus& aStatus) override;
+
+  void GetRadicalXOffsets(nscoord aIndexWidth, nscoord aSqrWidth,
+                          nsFontMetrics* aFontMetrics, nscoord* aIndexOffset,
+                          nscoord* aSqrOffset);
+
+  virtual void GetIntrinsicISizeMetrics(gfxContext* aRenderingContext,
+                                        ReflowOutput& aDesiredSize) override;
+
+  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                                const nsDisplayListSet& aLists) override;
+
+  uint8_t ScriptIncrement(nsIFrame* aFrame) override {
+    return (aFrame && aFrame == mFrames.LastChild()) ? 2 : 0;
+  }
+
+ protected:
+  explicit nsMathMLmrootFrame(ComputedStyle* aStyle,
+                              nsPresContext* aPresContext);
+  virtual ~nsMathMLmrootFrame();
+
+  nsMathMLChar mSqrChar;
+  nsRect mBarRect;
+
+ private:
+  bool ShouldUseRowFallback();
+};
+
+#endif /* nsMathMLmrootFrame_h___ */