1 files changed, 172 insertions, 0 deletions
diff --git a/layout/generic/nsPageFrame.h b/layout/generic/nsPageFrame.h
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+++ b/layout/generic/nsPageFrame.h
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+/* -*- 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 nsPageFrame_h___
+#define nsPageFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsContainerFrame.h"
+#include "nsLeafFrame.h"
+
+class nsFontMetrics;
+class nsPageContentFrame;
+class nsSharedPageData;
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+// Page frame class. Represents an individual page, in paginated mode.
+class nsPageFrame final : public nsContainerFrame {
+ public:
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS(nsPageFrame)
+
+  friend nsPageFrame* NS_NewPageFrame(mozilla::PresShell* aPresShell,
+                                      ComputedStyle* aStyle);
+
+  void Reflow(nsPresContext* aPresContext, ReflowOutput& aReflowOutput,
+              const ReflowInput& aReflowInput,
+              nsReflowStatus& aStatus) override;
+
+  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                        const nsDisplayListSet& aLists) override;
+
+#ifdef DEBUG_FRAME_DUMP
+  nsresult GetFrameName(nsAString& aResult) const override;
+#endif
+
+  //////////////////
+  // For Printing
+  //////////////////
+
+  // Determine this page's page-number, based on its previous continuation
+  // (whose page number is presumed to already be known).
+  void DeterminePageNum();
+  int32_t GetPageNum() const { return mPageNum; }
+
+  void SetSharedPageData(nsSharedPageData* aPD);
+  nsSharedPageData* GetSharedPageData() const { return mPD; }
+
+  void PaintHeaderFooter(gfxContext& aRenderingContext, nsPoint aPt,
+                         bool aSubpixelAA);
+
+  const nsMargin& GetUsedPageContentMargin() const {
+    return mPageContentMargin;
+  }
+
+  uint32_t IndexOnSheet() const { return mIndexOnSheet; }
+  void SetIndexOnSheet(uint32_t aIndexOnSheet) {
+    mIndexOnSheet = aIndexOnSheet;
+  }
+
+  ComputeTransformFunction GetTransformGetter() const override;
+
+  nsPageContentFrame* PageContentFrame() const;
+
+  nsSize ComputePageSize() const;
+
+  // Computes the scaling factor to fit the page to the sheet in the single
+  // page-per-sheet case. (The multiple pages-per-sheet case is currently
+  // different - see the comment for
+  // PrintedSheetFrame::ComputePagesPerSheetGridMetrics and code in
+  // ComputePagesPerSheetAndPageSizeTransform.) The page and sheet dimensions
+  // may be different due to a CSS page-size that gives the page a size that is
+  // too large to fit on the sheet that we are printing to.
+  float ComputeSinglePPSPageSizeScale(const nsSize aContentPageSize) const;
+
+  // The default implementation of FirstContinuation in nsSplittableFrame is
+  // implemented in linear time, walking back through the linked list of
+  // continuations via mPrevContinuation.
+  // For nsPageFrames, we can find the first continuation through the frame
+  // tree structure in constant time.
+  nsIFrame* FirstContinuation() const final;
+
+ protected:
+  explicit nsPageFrame(ComputedStyle* aStyle, nsPresContext* aPresContext);
+  virtual ~nsPageFrame();
+
+  typedef enum { eHeader, eFooter } nsHeaderFooterEnum;
+
+  nscoord GetXPosition(gfxContext& aRenderingContext,
+                       nsFontMetrics& aFontMetrics, const nsRect& aRect,
+                       int32_t aJust, const nsString& aStr);
+
+  nsReflowStatus ReflowPageContent(nsPresContext*,
+                                   const ReflowInput& aPageReflowInput);
+
+  void DrawHeaderFooter(gfxContext& aRenderingContext,
+                        nsFontMetrics& aFontMetrics,
+                        nsHeaderFooterEnum aHeaderFooter, int32_t aJust,
+                        const nsString& sStr, const nsRect& aRect,
+                        nscoord aHeight, nscoord aAscent, nscoord aWidth);
+
+  void DrawHeaderFooter(gfxContext& aRenderingContext,
+                        nsFontMetrics& aFontMetrics,
+                        nsHeaderFooterEnum aHeaderFooter,
+                        const nsString& aStrLeft, const nsString& aStrRight,
+                        const nsString& aStrCenter, const nsRect& aRect,
+                        nscoord aAscent, nscoord aHeight);
+
+  void ProcessSpecialCodes(const nsString& aStr, nsString& aNewStr);
+
+  static constexpr int32_t kPageNumUnset = -1;
+  // 1-based page-num
+  int32_t mPageNum = kPageNumUnset;
+
+  // 0-based index on the sheet that we belong to. Unused/meaningless if this
+  // page has frame state bit NS_PAGE_SKIPPED_BY_CUSTOM_RANGE.
+  uint32_t mIndexOnSheet = 0;
+
+  // Note: this will be set before reflow, and it's strongly owned by our
+  // nsPageSequenceFrame, which outlives us.
+  nsSharedPageData* mPD = nullptr;
+
+  // Computed page content margins.
+  //
+  // This is the amount of space from the edges of the content to the edges,
+  // measured in the content coordinate space. This is as opposed to the
+  // coordinate space of the physical paper. This might be different due to
+  // a CSS page-size that is too large to fit on the paper, causing content to
+  // be scaled to fit.
+  //
+  // These margins take into account:
+  //    * CSS-defined margins (content units)
+  //    * User-supplied margins (physical units)
+  //    * Unwriteable-supplied margins (physical units)
+  //
+  // When computing these margins, all physical units have the inverse of the
+  // scaling factor caused by CSS page-size downscaling applied. This ensures
+  // that even if the content will be downscaled, it will respect the (now
+  // upscaled) physical unwriteable margins required by the printer.
+  // For user-supplied margins, it isn't immediately obvious to the user what
+  // the intended page-size of the document is, so we consider these margins to
+  // be in the physical space of the paper.
+  nsMargin mPageContentMargin;
+};
+
+class nsPageBreakFrame final : public nsLeafFrame {
+  NS_DECL_FRAMEARENA_HELPERS(nsPageBreakFrame)
+
+  explicit nsPageBreakFrame(ComputedStyle* aStyle, nsPresContext* aPresContext);
+  ~nsPageBreakFrame();
+
+  void Reflow(nsPresContext* aPresContext, ReflowOutput& aReflowOutput,
+              const ReflowInput& aReflowInput,
+              nsReflowStatus& aStatus) override;
+
+#ifdef DEBUG_FRAME_DUMP
+  nsresult GetFrameName(nsAString& aResult) const override;
+#endif
+
+ protected:
+  nscoord GetIntrinsicISize() override;
+  nscoord GetIntrinsicBSize() override;
+
+  friend nsIFrame* NS_NewPageBreakFrame(mozilla::PresShell* aPresShell,
+                                        ComputedStyle* aStyle);
+};
+
+#endif /* nsPageFrame_h___ */