1 files changed, 93 insertions, 0 deletions
diff --git a/layout/generic/nsFirstLetterFrame.h b/layout/generic/nsFirstLetterFrame.h
new file mode 100644
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+++ b/layout/generic/nsFirstLetterFrame.h
@@ -0,0 +1,93 @@
+/* -*- 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 nsFirstLetterFrame_h__
+#define nsFirstLetterFrame_h__
+
+/* rendering object for CSS :first-letter pseudo-element */
+
+#include "mozilla/Attributes.h"
+#include "nsContainerFrame.h"
+
+class nsFirstLetterFrame final : public nsContainerFrame {
+ public:
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS(nsFirstLetterFrame)
+
+  explicit nsFirstLetterFrame(ComputedStyle* aStyle,
+                              nsPresContext* aPresContext)
+      : nsContainerFrame(aStyle, aPresContext, kClassID) {}
+
+  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                                const nsDisplayListSet& aLists) override;
+
+  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
+                    nsIFrame* aPrevInFlow) override;
+  void SetInitialChildList(ChildListID aListID,
+                           nsFrameList&& aChildList) override;
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const override;
+#endif
+
+  bool IsFloating() const { return HasAnyStateBits(NS_FRAME_OUT_OF_FLOW); }
+
+  virtual bool IsFrameOfType(uint32_t aFlags) const override {
+    if (!IsFloating()) aFlags = aFlags & ~(nsIFrame::eLineParticipant);
+    return nsContainerFrame::IsFrameOfType(aFlags &
+                                           ~(nsIFrame::eBidiInlineContainer));
+  }
+
+  virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
+  virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;
+  virtual void AddInlineMinISize(gfxContext* aRenderingContext,
+                                 InlineMinISizeData* aData) override;
+  virtual void AddInlinePrefISize(gfxContext* aRenderingContext,
+                                  InlinePrefISizeData* aData) override;
+
+  SizeComputationResult ComputeSize(
+      gfxContext* aRenderingContext, mozilla::WritingMode aWM,
+      const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
+      const mozilla::LogicalSize& aMargin,
+      const mozilla::LogicalSize& aBorderPadding,
+      const mozilla::StyleSizeOverrides& aSizeOverrides,
+      mozilla::ComputeSizeFlags aFlags) override;
+
+  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+                      const ReflowInput& aReflowInput,
+                      nsReflowStatus& aStatus) override;
+
+  virtual bool CanContinueTextRun() const override;
+  Maybe<nscoord> GetNaturalBaselineBOffset(
+      mozilla::WritingMode aWM, BaselineSharingGroup aBaselineGroup,
+      BaselineExportContext) const override;
+  virtual LogicalSides GetLogicalSkipSides() const override;
+
+  // override of nsFrame method
+  virtual nsresult GetChildFrameContainingOffset(
+      int32_t inContentOffset, bool inHint, int32_t* outFrameContentOffset,
+      nsIFrame** outChildFrame) override;
+
+  nscoord GetFirstLetterBaseline() const { return mBaseline; }
+
+  // For floating first letter frames, create a continuation for aChild and
+  // place it in the correct place. aContinuation is an outparam for the
+  // continuation that is created. aIsFluid determines if the continuation is
+  // fluid or not.
+  void CreateContinuationForFloatingParent(nsIFrame* aChild,
+                                           nsIFrame** aContinuation,
+                                           bool aIsFluid);
+
+  // Whether to use tight glyph bounds for a floating first-letter frame,
+  // or "loose" bounds based on font metrics rather than individual glyphs.
+  bool UseTightBounds() const;
+
+ protected:
+  nscoord mBaseline;
+
+  void DrainOverflowFrames(nsPresContext* aPresContext);
+};
+
+#endif /* nsFirstLetterFrame_h__ */