1 files changed, 163 insertions, 0 deletions
diff --git a/layout/generic/nsIFrameInlines.h b/layout/generic/nsIFrameInlines.h
new file mode 100644
index 000000000..eb9a7202a
--- /dev/null
+++ b/layout/generic/nsIFrameInlines.h
@@ -0,0 +1,163 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sw=2 et tw=78: */
+/* 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 nsIFrameInlines_h___
+#define nsIFrameInlines_h___
+
+#include "nsContainerFrame.h"
+#include "nsStyleStructInlines.h"
+#include "nsCSSAnonBoxes.h"
+
+bool
+nsIFrame::IsFlexItem() const
+{
+  return GetParent() &&
+    GetParent()->GetType() == nsGkAtoms::flexContainerFrame &&
+    !(GetStateBits() & NS_FRAME_OUT_OF_FLOW);
+}
+
+bool
+nsIFrame::IsFlexOrGridContainer() const
+{
+  nsIAtom* t = GetType();
+  return t == nsGkAtoms::flexContainerFrame ||
+         t == nsGkAtoms::gridContainerFrame;
+}
+
+bool
+nsIFrame::IsFlexOrGridItem() const
+{
+  return !(GetStateBits() & NS_FRAME_OUT_OF_FLOW) &&
+         GetParent() &&
+         GetParent()->IsFlexOrGridContainer();
+}
+
+bool
+nsIFrame::IsTableCaption() const
+{
+  return StyleDisplay()->mDisplay == mozilla::StyleDisplay::TableCaption &&
+    GetParent()->StyleContext()->GetPseudo() == nsCSSAnonBoxes::tableWrapper;
+}
+
+bool
+nsIFrame::IsFloating() const
+{
+  return StyleDisplay()->IsFloating(this);
+}
+
+bool
+nsIFrame::IsAbsPosContainingBlock() const
+{
+  return StyleDisplay()->IsAbsPosContainingBlock(this);
+}
+
+bool
+nsIFrame::IsFixedPosContainingBlock() const
+{
+  return StyleDisplay()->IsFixedPosContainingBlock(this);
+}
+
+bool
+nsIFrame::IsRelativelyPositioned() const
+{
+  return StyleDisplay()->IsRelativelyPositioned(this);
+}
+
+bool
+nsIFrame::IsAbsolutelyPositioned() const
+{
+  return StyleDisplay()->IsAbsolutelyPositioned(this);
+}
+
+bool
+nsIFrame::IsBlockInside() const
+{
+  return StyleDisplay()->IsBlockInside(this);
+}
+
+bool
+nsIFrame::IsBlockOutside() const
+{
+  return StyleDisplay()->IsBlockOutside(this);
+}
+
+bool
+nsIFrame::IsInlineOutside() const
+{
+  return StyleDisplay()->IsInlineOutside(this);
+}
+
+mozilla::StyleDisplay
+nsIFrame::GetDisplay() const
+{
+  return StyleDisplay()->GetDisplay(this);
+}
+
+nscoord
+nsIFrame::SynthesizeBaselineBOffsetFromMarginBox(
+            mozilla::WritingMode aWM,
+            BaselineSharingGroup aGroup) const
+{
+  MOZ_ASSERT(!aWM.IsOrthogonalTo(GetWritingMode()));
+  auto margin = GetLogicalUsedMargin(aWM);
+  if (aGroup == BaselineSharingGroup::eFirst) {
+    if (aWM.IsAlphabeticalBaseline()) {
+      // First baseline for inverted-line content is the block-start margin edge,
+      // as the frame is in effect "flipped" for alignment purposes.
+      return MOZ_UNLIKELY(aWM.IsLineInverted()) ? -margin.BStart(aWM)
+                                                : BSize(aWM) + margin.BEnd(aWM);
+    }
+    nscoord marginBoxCenter = (BSize(aWM) + margin.BStartEnd(aWM)) / 2;
+    return marginBoxCenter - margin.BStart(aWM);
+  }
+  MOZ_ASSERT(aGroup == BaselineSharingGroup::eLast);
+  if (aWM.IsAlphabeticalBaseline()) {
+    // Last baseline for inverted-line content is the block-start margin edge,
+    // as the frame is in effect "flipped" for alignment purposes.
+    return MOZ_UNLIKELY(aWM.IsLineInverted()) ? BSize(aWM) + margin.BStart(aWM)
+                                              : -margin.BEnd(aWM);
+  }
+  // Round up for central baseline offset, to be consistent with eFirst.
+  nscoord marginBoxSize = BSize(aWM) + margin.BStartEnd(aWM);
+  nscoord marginBoxCenter = (marginBoxSize / 2) + (marginBoxSize % 2);
+  return marginBoxCenter - margin.BEnd(aWM);
+}
+
+nscoord
+nsIFrame::SynthesizeBaselineBOffsetFromBorderBox(
+            mozilla::WritingMode aWM,
+            BaselineSharingGroup aGroup) const
+{
+  MOZ_ASSERT(!aWM.IsOrthogonalTo(GetWritingMode()));
+  nscoord borderBoxSize = BSize(aWM);
+  if (aGroup == BaselineSharingGroup::eFirst) {
+    return MOZ_LIKELY(aWM.IsAlphabeticalBaseline()) ? borderBoxSize
+                                                    : borderBoxSize / 2;
+  }
+  MOZ_ASSERT(aGroup == BaselineSharingGroup::eLast);
+  // Round up for central baseline offset, to be consistent with eFirst.
+  auto borderBoxCenter = (borderBoxSize / 2) + (borderBoxSize % 2);
+  return MOZ_LIKELY(aWM.IsAlphabeticalBaseline()) ? 0 : borderBoxCenter;
+}
+
+nscoord
+nsIFrame::BaselineBOffset(mozilla::WritingMode aWM,
+                          BaselineSharingGroup aBaselineGroup,
+                          AlignmentContext     aAlignmentContext) const
+{
+  MOZ_ASSERT(!aWM.IsOrthogonalTo(GetWritingMode()));
+  nscoord baseline;
+  if (GetNaturalBaselineBOffset(aWM, aBaselineGroup, &baseline)) {
+    return baseline;
+  }
+  if (aAlignmentContext == AlignmentContext::eInline) {
+    return SynthesizeBaselineBOffsetFromMarginBox(aWM, aBaselineGroup);
+  }
+  // XXX AlignmentContext::eTable should use content box?
+  return SynthesizeBaselineBOffsetFromBorderBox(aWM, aBaselineGroup);
+}
+
+#endif