1 files changed, 66 insertions, 0 deletions
diff --git a/layout/generic/PrintedSheetFrame.h b/layout/generic/PrintedSheetFrame.h
new file mode 100644
index 0000000000..22708813bf
--- /dev/null
+++ b/layout/generic/PrintedSheetFrame.h
@@ -0,0 +1,66 @@
+/* -*- 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 https://mozilla.org/MPL/2.0/. */
+
+/* Rendering object for a printed or print-previewed sheet of paper */
+
+#ifndef LAYOUT_GENERIC_PRINTEDSHEETFRAME_H_
+#define LAYOUT_GENERIC_PRINTEDSHEETFRAME_H_
+
+#include "nsContainerFrame.h"
+#include "nsHTMLParts.h"
+
+class nsSharedPageData;
+
+namespace mozilla {
+
+class PrintedSheetFrame final : public nsContainerFrame {
+ public:
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS(PrintedSheetFrame)
+
+  friend PrintedSheetFrame* ::NS_NewPrintedSheetFrame(
+      mozilla::PresShell* aPresShell, ComputedStyle* aStyle);
+
+  void SetSharedPageData(nsSharedPageData* aPD) { mPD = aPD; }
+
+  // nsIFrame overrides
+  void Reflow(nsPresContext* aPresContext, ReflowOutput& aReflowOutput,
+              const ReflowInput& aReflowInput,
+              nsReflowStatus& aStatus) override;
+
+  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                        const nsDisplayListSet& aLists) override;
+
+  // Return our first page frame.
+  void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
+
+#ifdef DEBUG_FRAME_DUMP
+  nsresult GetFrameName(nsAString& aResult) const override;
+#endif
+
+  uint32_t GetNumPages() const { return mNumPages; }
+
+ private:
+  // Private construtor & destructor, to avoid accidental (non-FrameArena)
+  // instantiation/deletion:
+  PrintedSheetFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
+      : nsContainerFrame(aStyle, aPresContext, kClassID) {}
+  ~PrintedSheetFrame() = default;
+
+  // Helper function to populate some pages-per-sheet metrics in our
+  // nsSharedPageData.
+  void ComputePagesPerSheetOriginAndScale();
+
+  // Note: this will be set before reflow, and it's strongly owned by our
+  // nsPageSequenceFrame, which outlives us.
+  nsSharedPageData* mPD = nullptr;
+  // The number of visible pages in this sheet.
+  uint32_t mNumPages = 0;
+};
+
+}  // namespace mozilla
+
+#endif /* LAYOUT_GENERIC_PRINTEDSHEETFRAME_H_ */