1 files changed, 124 insertions, 0 deletions
diff --git a/layout/mathml/nsMathMLmspaceFrame.cpp b/layout/mathml/nsMathMLmspaceFrame.cpp
new file mode 100644
index 0000000000..9b6e54ae13
--- /dev/null
+++ b/layout/mathml/nsMathMLmspaceFrame.cpp
@@ -0,0 +1,124 @@
+/* -*- 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/. */
+
+#include "nsMathMLmspaceFrame.h"
+
+#include "mozilla/dom/MathMLElement.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/gfx/2D.h"
+#include "nsLayoutUtils.h"
+#include <algorithm>
+
+using namespace mozilla;
+
+//
+// <mspace> -- space - implementation
+//
+
+nsIFrame* NS_NewMathMLmspaceFrame(PresShell* aPresShell,
+                                  ComputedStyle* aStyle) {
+  return new (aPresShell)
+      nsMathMLmspaceFrame(aStyle, aPresShell->GetPresContext());
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmspaceFrame)
+
+nsMathMLmspaceFrame::~nsMathMLmspaceFrame() = default;
+
+void nsMathMLmspaceFrame::ProcessAttributes(nsPresContext* aPresContext) {
+  nsAutoString value;
+  float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
+
+  // width
+  //
+  // "Specifies the desired width of the space."
+  //
+  // values: length
+  // default: 0em
+  //
+  // The default value is "0em", so unitless values can be ignored.
+  // <mspace/> is listed among MathML elements allowing negative spacing and
+  // the MathML test suite contains "Presentation/TokenElements/mspace/mspace2"
+  // as an example. Hence we allow negative values.
+  //
+  mWidth = 0;
+  mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::width, value);
+  if (!value.IsEmpty()) {
+    ParseNumericValue(value, &mWidth, dom::MathMLElement::PARSE_ALLOW_NEGATIVE,
+                      aPresContext, mComputedStyle, fontSizeInflation);
+  }
+
+  // height
+  //
+  // "Specifies the desired height (above the baseline) of the space."
+  //
+  // values: length
+  // default: 0ex
+  //
+  // The default value is "0ex", so unitless values can be ignored.
+  // We do not allow negative values. See bug 716349.
+  //
+  mHeight = 0;
+  mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::height, value);
+  if (!value.IsEmpty()) {
+    ParseNumericValue(value, &mHeight, 0, aPresContext, mComputedStyle,
+                      fontSizeInflation);
+  }
+
+  // depth
+  //
+  // "Specifies the desired depth (below the baseline) of the space."
+  //
+  // values: length
+  // default: 0ex
+  //
+  // The default value is "0ex", so unitless values can be ignored.
+  // We do not allow negative values. See bug 716349.
+  //
+  mDepth = 0;
+  mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::depth_, value);
+  if (!value.IsEmpty()) {
+    ParseNumericValue(value, &mDepth, 0, aPresContext, mComputedStyle,
+                      fontSizeInflation);
+  }
+}
+
+void nsMathMLmspaceFrame::Reflow(nsPresContext* aPresContext,
+                                 ReflowOutput& aDesiredSize,
+                                 const ReflowInput& aReflowInput,
+                                 nsReflowStatus& aStatus) {
+  MarkInReflow();
+  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
+
+  mPresentationData.flags &= ~NS_MATHML_ERROR;
+  ProcessAttributes(aPresContext);
+
+  auto borderPadding = aReflowInput.ComputedPhysicalBorderPadding();
+  mBoundingMetrics = nsBoundingMetrics();
+  mBoundingMetrics.width = mWidth + borderPadding.LeftRight();
+  mBoundingMetrics.ascent = mHeight + borderPadding.Side(eSideTop);
+  mBoundingMetrics.descent = mDepth + borderPadding.Side(eSideBottom);
+  mBoundingMetrics.leftBearing = 0;
+  mBoundingMetrics.rightBearing = mBoundingMetrics.width;
+
+  aDesiredSize.SetBlockStartAscent(mBoundingMetrics.ascent);
+  aDesiredSize.Width() = std::max(0, mBoundingMetrics.width);
+  aDesiredSize.Height() = mBoundingMetrics.ascent + mBoundingMetrics.descent;
+  // Also return our bounding metrics
+  aDesiredSize.mBoundingMetrics = mBoundingMetrics;
+}
+
+/* virtual */
+nsresult nsMathMLmspaceFrame::MeasureForWidth(DrawTarget* aDrawTarget,
+                                              ReflowOutput& aDesiredSize) {
+  ProcessAttributes(PresContext());
+  mBoundingMetrics = nsBoundingMetrics();
+  auto offsets = IntrinsicISizeOffsets();
+  mBoundingMetrics.width = mWidth + offsets.padding + offsets.border;
+  aDesiredSize.Width() = std::max(0, mBoundingMetrics.width);
+  aDesiredSize.mBoundingMetrics = mBoundingMetrics;
+  return NS_OK;
+}