1 files changed, 172 insertions, 0 deletions
diff --git a/layout/generic/nsRubyTextContainerFrame.cpp b/layout/generic/nsRubyTextContainerFrame.cpp
new file mode 100644
index 0000000000..96200b8630
--- /dev/null
+++ b/layout/generic/nsRubyTextContainerFrame.cpp
@@ -0,0 +1,172 @@
+/* -*- 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/. */
+
+/* rendering object for CSS "display: ruby-text-container" */
+
+#include "nsRubyTextContainerFrame.h"
+
+#include "mozilla/ComputedStyle.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/WritingModes.h"
+#include "nsLineLayout.h"
+#include "nsPresContext.h"
+
+using namespace mozilla;
+
+//----------------------------------------------------------------------
+
+// Frame class boilerplate
+// =======================
+
+NS_QUERYFRAME_HEAD(nsRubyTextContainerFrame)
+  NS_QUERYFRAME_ENTRY(nsRubyTextContainerFrame)
+NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
+
+NS_IMPL_FRAMEARENA_HELPERS(nsRubyTextContainerFrame)
+
+nsContainerFrame* NS_NewRubyTextContainerFrame(PresShell* aPresShell,
+                                               ComputedStyle* aStyle) {
+  return new (aPresShell)
+      nsRubyTextContainerFrame(aStyle, aPresShell->GetPresContext());
+}
+
+//----------------------------------------------------------------------
+
+// nsRubyTextContainerFrame Method Implementations
+// ===============================================
+
+#ifdef DEBUG_FRAME_DUMP
+nsresult nsRubyTextContainerFrame::GetFrameName(nsAString& aResult) const {
+  return MakeFrameName(u"RubyTextContainer"_ns, aResult);
+}
+#endif
+
+/* virtual */
+bool nsRubyTextContainerFrame::IsFrameOfType(uint32_t aFlags) const {
+  if (aFlags & (eSupportsCSSTransforms | eSupportsContainLayoutAndPaint)) {
+    return false;
+  }
+  return nsContainerFrame::IsFrameOfType(aFlags);
+}
+
+/* virtual */
+void nsRubyTextContainerFrame::SetInitialChildList(ChildListID aListID,
+                                                   nsFrameList& aChildList) {
+  nsContainerFrame::SetInitialChildList(aListID, aChildList);
+  if (aListID == kPrincipalList) {
+    UpdateSpanFlag();
+  }
+}
+
+/* virtual */
+void nsRubyTextContainerFrame::AppendFrames(ChildListID aListID,
+                                            nsFrameList& aFrameList) {
+  nsContainerFrame::AppendFrames(aListID, aFrameList);
+  UpdateSpanFlag();
+}
+
+/* virtual */
+void nsRubyTextContainerFrame::InsertFrames(
+    ChildListID aListID, nsIFrame* aPrevFrame,
+    const nsLineList::iterator* aPrevFrameLine, nsFrameList& aFrameList) {
+  nsContainerFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine,
+                                 aFrameList);
+  UpdateSpanFlag();
+}
+
+/* virtual */
+void nsRubyTextContainerFrame::RemoveFrame(ChildListID aListID,
+                                           nsIFrame* aOldFrame) {
+  nsContainerFrame::RemoveFrame(aListID, aOldFrame);
+  UpdateSpanFlag();
+}
+
+void nsRubyTextContainerFrame::UpdateSpanFlag() {
+  bool isSpan = false;
+  // The continuation checks are safe here because spans never break.
+  if (!GetPrevContinuation() && !GetNextContinuation()) {
+    nsIFrame* onlyChild = mFrames.OnlyChild();
+    if (onlyChild && onlyChild->IsPseudoFrame(GetContent())) {
+      // Per CSS Ruby spec, if the only child of an rtc frame is
+      // a pseudo rt frame, it spans all bases in the segment.
+      isSpan = true;
+    }
+  }
+
+  if (isSpan) {
+    AddStateBits(NS_RUBY_TEXT_CONTAINER_IS_SPAN);
+  } else {
+    RemoveStateBits(NS_RUBY_TEXT_CONTAINER_IS_SPAN);
+  }
+}
+
+/* virtual */
+void nsRubyTextContainerFrame::Reflow(nsPresContext* aPresContext,
+                                      ReflowOutput& aDesiredSize,
+                                      const ReflowInput& aReflowInput,
+                                      nsReflowStatus& aStatus) {
+  MarkInReflow();
+  DO_GLOBAL_REFLOW_COUNT("nsRubyTextContainerFrame");
+  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
+  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
+
+  // Although a ruby text container may have continuations, returning
+  // complete reflow status is still safe, since its parent, ruby frame,
+  // ignores the status, and continuations of the ruby base container
+  // will take care of our continuations.
+  WritingMode rtcWM = GetWritingMode();
+
+  nscoord minBCoord = nscoord_MAX;
+  nscoord maxBCoord = nscoord_MIN;
+  // The container size is not yet known, so we use a dummy (0, 0) size.
+  // The block-dir position will be corrected below after containerSize
+  // is finalized.
+  const nsSize dummyContainerSize;
+  for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
+    nsIFrame* child = e.get();
+    MOZ_ASSERT(child->IsRubyTextFrame());
+    LogicalRect rect = child->GetLogicalRect(rtcWM, dummyContainerSize);
+    LogicalMargin margin = child->GetLogicalUsedMargin(rtcWM);
+    nscoord blockStart = rect.BStart(rtcWM) - margin.BStart(rtcWM);
+    minBCoord = std::min(minBCoord, blockStart);
+    nscoord blockEnd = rect.BEnd(rtcWM) + margin.BEnd(rtcWM);
+    maxBCoord = std::max(maxBCoord, blockEnd);
+  }
+
+  if (!mFrames.IsEmpty()) {
+    if (MOZ_UNLIKELY(minBCoord > maxBCoord)) {
+      // XXX When bug 765861 gets fixed, this warning should be upgraded.
+      NS_WARNING("bad block coord");
+      minBCoord = maxBCoord = 0;
+    }
+    LogicalSize size(rtcWM, mISize, maxBCoord - minBCoord);
+    nsSize containerSize = size.GetPhysicalSize(rtcWM);
+    for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
+      nsIFrame* child = e.get();
+      // We reflowed the child with a dummy container size, as the true size
+      // was not yet known at that time.
+      LogicalPoint pos = child->GetLogicalPosition(rtcWM, dummyContainerSize);
+      // Adjust block position to account for minBCoord,
+      // then reposition child based on the true container width.
+      pos.B(rtcWM) -= minBCoord;
+      // Relative positioning hasn't happened yet.
+      // So MovePositionBy should not be used here.
+      child->SetPosition(rtcWM, pos, containerSize);
+      nsContainerFrame::PlaceFrameView(child);
+    }
+    aDesiredSize.SetSize(rtcWM, size);
+  } else {
+    // If this ruby text container is empty, size it as if there were
+    // an empty inline child inside.
+    // Border and padding are suppressed on ruby text container, so we
+    // create a dummy zero-sized borderPadding for setting BSize.
+    aDesiredSize.ISize(rtcWM) = mISize;
+    LogicalMargin borderPadding(rtcWM);
+    nsLayoutUtils::SetBSizeFromFontMetrics(this, aDesiredSize, borderPadding,
+                                           rtcWM, rtcWM);
+  }
+}