1 files changed, 100 insertions, 0 deletions
diff --git a/layout/generic/nsContainerFrameInlines.h b/layout/generic/nsContainerFrameInlines.h
new file mode 100644
index 0000000000..f6c85d791e
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+++ b/layout/generic/nsContainerFrameInlines.h
@@ -0,0 +1,100 @@
+/* -*- 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 nsContainerFrameInlines_h___
+#define nsContainerFrameInlines_h___
+
+#include "nsContainerFrame.h"
+
+template <typename ISizeData, typename F>
+void nsContainerFrame::DoInlineIntrinsicISize(ISizeData* aData,
+                                              F& aHandleChildren) {
+  using namespace mozilla;
+
+  auto GetMargin = [](const LengthPercentageOrAuto& aCoord) -> nscoord {
+    return aCoord.IsAuto() ? 0 : aCoord.AsLengthPercentage().Resolve(0);
+  };
+
+  if (GetPrevInFlow()) return;  // Already added.
+
+  WritingMode wm = GetWritingMode();
+  Side startSide = wm.PhysicalSideForInlineAxis(eLogicalEdgeStart);
+  Side endSide = wm.PhysicalSideForInlineAxis(eLogicalEdgeEnd);
+
+  const nsStylePadding* stylePadding = StylePadding();
+  const nsStyleBorder* styleBorder = StyleBorder();
+  const nsStyleMargin* styleMargin = StyleMargin();
+
+  // This goes at the beginning no matter how things are broken and how
+  // messy the bidi situations are, since per CSS2.1 section 8.6
+  // (implemented in bug 328168), the startSide border is always on the
+  // first line.
+  // This frame is a first-in-flow, but it might have a previous bidi
+  // continuation, in which case that continuation should handle the startSide
+  // border.
+  // For box-decoration-break:clone we setup clonePBM = startPBM + endPBM and
+  // add that to each line.  For box-decoration-break:slice clonePBM is zero.
+  nscoord clonePBM = 0;  // PBM = PaddingBorderMargin
+  const bool sliceBreak =
+      styleBorder->mBoxDecorationBreak == StyleBoxDecorationBreak::Slice;
+  if (!GetPrevContinuation() || MOZ_UNLIKELY(!sliceBreak)) {
+    nscoord startPBM =
+        // clamp negative calc() to 0
+        std::max(stylePadding->mPadding.Get(startSide).Resolve(0), 0) +
+        styleBorder->GetComputedBorderWidth(startSide) +
+        GetMargin(styleMargin->mMargin.Get(startSide));
+    if (MOZ_LIKELY(sliceBreak)) {
+      aData->mCurrentLine += startPBM;
+    } else {
+      clonePBM = startPBM;
+    }
+  }
+
+  nscoord endPBM =
+      // clamp negative calc() to 0
+      std::max(stylePadding->mPadding.Get(endSide).Resolve(0), 0) +
+      styleBorder->GetComputedBorderWidth(endSide) +
+      GetMargin(styleMargin->mMargin.Get(endSide));
+  if (MOZ_UNLIKELY(!sliceBreak)) {
+    clonePBM += endPBM;
+    aData->mCurrentLine += clonePBM;
+  }
+
+  const nsLineList_iterator* savedLine = aData->mLine;
+  nsIFrame* const savedLineContainer = aData->LineContainer();
+
+  nsContainerFrame* lastInFlow;
+  for (nsContainerFrame* nif = this; nif;
+       nif = static_cast<nsContainerFrame*>(nif->GetNextInFlow())) {
+    if (aData->mCurrentLine == 0) {
+      aData->mCurrentLine = clonePBM;
+    }
+    aHandleChildren(nif, aData);
+
+    // After we advance to our next-in-flow, the stored line and line container
+    // may no longer be correct. Just forget them.
+    aData->mLine = nullptr;
+    aData->SetLineContainer(nullptr);
+
+    lastInFlow = nif;
+  }
+
+  aData->mLine = savedLine;
+  aData->SetLineContainer(savedLineContainer);
+
+  // This goes at the end no matter how things are broken and how
+  // messy the bidi situations are, since per CSS2.1 section 8.6
+  // (implemented in bug 328168), the endSide border is always on the
+  // last line.
+  // We reached the last-in-flow, but it might have a next bidi
+  // continuation, in which case that continuation should handle
+  // the endSide border.
+  if (MOZ_LIKELY(!lastInFlow->GetNextContinuation() && sliceBreak)) {
+    aData->mCurrentLine += endPBM;
+  }
+}
+
+#endif  // nsContainerFrameInlines_h___