1 files changed, 162 insertions, 0 deletions
diff --git a/layout/svg/SVGContainerFrame.h b/layout/svg/SVGContainerFrame.h
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+++ b/layout/svg/SVGContainerFrame.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 LAYOUT_SVG_SVGCONTAINERFRAME_H_
+#define LAYOUT_SVG_SVGCONTAINERFRAME_H_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/ISVGDisplayableFrame.h"
+#include "mozilla/UniquePtr.h"
+#include "nsContainerFrame.h"
+#include "nsIFrame.h"
+#include "nsQueryFrame.h"
+#include "nsRect.h"
+
+class gfxContext;
+class nsFrameList;
+class nsIContent;
+
+struct nsRect;
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+nsIFrame* NS_NewSVGContainerFrame(mozilla::PresShell* aPresShell,
+                                  mozilla::ComputedStyle* aStyle);
+
+namespace mozilla {
+
+/**
+ * Base class for SVG container frames. Frame sub-classes that do not
+ * display their contents directly (such as the frames for <marker> or
+ * <pattern>) just inherit this class. Frame sub-classes that do or can
+ * display their contents directly (such as the frames for inner-<svg> or
+ * <g>) inherit our SVGDisplayContainerFrame sub-class.
+ *
+ *                               *** WARNING ***
+ *
+ * Do *not* blindly cast to SVG element types in this class's methods (see the
+ * warning comment for SVGDisplayContainerFrame below).
+ */
+class SVGContainerFrame : public nsContainerFrame {
+  friend nsIFrame* ::NS_NewSVGContainerFrame(mozilla::PresShell* aPresShell,
+                                             ComputedStyle* aStyle);
+
+ protected:
+  SVGContainerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
+                    ClassID aID)
+      : nsContainerFrame(aStyle, aPresContext, aID) {
+    AddStateBits(NS_FRAME_SVG_LAYOUT);
+  }
+
+ public:
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS(SVGContainerFrame)
+
+  // Returns the transform to our gfxContext (to device pixels, not CSS px)
+  virtual gfxMatrix GetCanvasTM() { return gfxMatrix(); }
+
+  /**
+   * Returns true if the frame's content has a transform that applies only to
+   * its children, and not to the frame itself. For example, an implicit
+   * transform introduced by a 'viewBox' attribute, or an explicit transform
+   * due to a root-<svg> having its currentScale/currentTransform properties
+   * set. If aTransform is non-null, then it will be set to the transform.
+   */
+  virtual bool HasChildrenOnlyTransform(Matrix* aTransform) const {
+    return false;
+  }
+
+  // nsIFrame:
+  void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
+  void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
+                    const nsLineList::iterator* aPrevFrameLine,
+                    nsFrameList&& aFrameList) override;
+  void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override;
+
+  bool IsFrameOfType(uint32_t aFlags) const override {
+    if (aFlags & eSupportsContainLayoutAndPaint) {
+      return false;
+    }
+
+    return nsContainerFrame::IsFrameOfType(
+        aFlags & ~(nsIFrame::eSVG | nsIFrame::eSVGContainer));
+  }
+
+  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                        const nsDisplayListSet& aLists) override {}
+
+  bool ComputeCustomOverflow(mozilla::OverflowAreas& aOverflowAreas) override;
+
+ protected:
+  /**
+   * Traverses a frame tree, marking any SVGTextFrame frames as dirty
+   * and calling InvalidateRenderingObservers() on it.
+   */
+  static void ReflowSVGNonDisplayText(nsIFrame* aContainer);
+};
+
+/**
+ * Frame class or base-class for SVG containers that can or do display their
+ * contents directly.
+ *
+ *                               *** WARNING ***
+ *
+ * This class's methods can *not* assume that mContent points to an instance of
+ * an SVG element class since this class is inherited by
+ * SVGGenericContainerFrame which is used for unrecognized elements in the
+ * SVG namespace. Do *not* blindly cast to SVG element types.
+ */
+class SVGDisplayContainerFrame : public SVGContainerFrame,
+                                 public ISVGDisplayableFrame {
+ protected:
+  SVGDisplayContainerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
+                           nsIFrame::ClassID aID)
+      : SVGContainerFrame(aStyle, aPresContext, aID) {
+    AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
+  }
+
+ public:
+  NS_DECL_QUERYFRAME
+  NS_DECL_QUERYFRAME_TARGET(SVGDisplayContainerFrame)
+  NS_DECL_ABSTRACT_FRAME(SVGDisplayContainerFrame)
+
+  // nsIFrame:
+  void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
+                    const nsLineList::iterator* aPrevFrameLine,
+                    nsFrameList&& aFrameList) override;
+  void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override;
+  void Init(nsIContent* aContent, nsContainerFrame* aParent,
+            nsIFrame* aPrevInFlow) override;
+
+  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                        const nsDisplayListSet& aLists) override;
+
+  bool IsSVGTransformed(Matrix* aOwnTransform = nullptr,
+                        Matrix* aFromParentTransform = nullptr) const override;
+
+  // ISVGDisplayableFrame interface:
+  void PaintSVG(gfxContext& aContext, const gfxMatrix& aTransform,
+                imgDrawingParams& aImgParams) override;
+  nsIFrame* GetFrameForPoint(const gfxPoint& aPoint) override;
+  void ReflowSVG() override;
+  void NotifySVGChanged(uint32_t aFlags) override;
+  SVGBBox GetBBoxContribution(const Matrix& aToBBoxUserspace,
+                              uint32_t aFlags) override;
+  bool IsDisplayContainer() override { return true; }
+  gfxMatrix GetCanvasTM() override;
+
+ protected:
+  /**
+   * Cached canvasTM value.
+   */
+  UniquePtr<gfxMatrix> mCanvasTM;
+};
+
+}  // namespace mozilla
+
+#endif  // LAYOUT_SVG_SVGCONTAINERFRAME_H_