1 files changed, 116 insertions, 0 deletions
diff --git a/layout/svg/nsSVGStopFrame.cpp b/layout/svg/nsSVGStopFrame.cpp
new file mode 100644
index 000000000..1b75fa102
--- /dev/null
+++ b/layout/svg/nsSVGStopFrame.cpp
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+// Keep in (case-insensitive) order:
+#include "nsContainerFrame.h"
+#include "nsFrame.h"
+#include "nsGkAtoms.h"
+#include "nsStyleContext.h"
+#include "nsSVGEffects.h"
+
+// This is a very simple frame whose only purpose is to capture style change
+// events and propagate them to the parent.  Most of the heavy lifting is done
+// within the nsSVGGradientFrame, which is the parent for this frame
+
+class nsSVGStopFrame : public nsFrame
+{
+  friend nsIFrame*
+  NS_NewSVGStopFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+protected:
+  explicit nsSVGStopFrame(nsStyleContext* aContext)
+    : nsFrame(aContext)
+  {
+    AddStateBits(NS_FRAME_IS_NONDISPLAY);
+  }
+
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  // nsIFrame interface:
+#ifdef DEBUG
+  virtual void Init(nsIContent*       aContent,
+                    nsContainerFrame* aParent,
+                    nsIFrame*         aPrevInFlow) override;
+#endif
+
+  void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                        const nsRect&           aDirtyRect,
+                        const nsDisplayListSet& aLists) override {}
+
+  virtual nsresult AttributeChanged(int32_t         aNameSpaceID,
+                                    nsIAtom*        aAttribute,
+                                    int32_t         aModType) override;
+
+  /**
+   * Get the "type" of the frame
+   *
+   * @see nsGkAtoms::svgStopFrame
+   */
+  virtual nsIAtom* GetType() const override;
+
+  virtual bool IsFrameOfType(uint32_t aFlags) const override
+  {
+    return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eSVG));
+  }
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const override
+  {
+    return MakeFrameName(NS_LITERAL_STRING("SVGStop"), aResult);
+  }
+#endif
+};
+
+//----------------------------------------------------------------------
+// Implementation
+
+NS_IMPL_FRAMEARENA_HELPERS(nsSVGStopFrame)
+
+//----------------------------------------------------------------------
+// nsIFrame methods:
+
+#ifdef DEBUG
+void
+nsSVGStopFrame::Init(nsIContent*       aContent,
+                     nsContainerFrame* aParent,
+                     nsIFrame*         aPrevInFlow)
+{
+  NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::stop), "Content is not a stop element");
+
+  nsFrame::Init(aContent, aParent, aPrevInFlow);
+}
+#endif /* DEBUG */
+
+nsIAtom *
+nsSVGStopFrame::GetType() const
+{
+  return nsGkAtoms::svgStopFrame;
+}
+
+nsresult
+nsSVGStopFrame::AttributeChanged(int32_t         aNameSpaceID,
+                                 nsIAtom*        aAttribute,
+                                 int32_t         aModType)
+{
+  if (aNameSpaceID == kNameSpaceID_None &&
+      aAttribute == nsGkAtoms::offset) {
+    MOZ_ASSERT(GetParent()->GetType() == nsGkAtoms::svgLinearGradientFrame ||
+               GetParent()->GetType() == nsGkAtoms::svgRadialGradientFrame,
+               "Observers observe the gradient, so that's what we must invalidate");
+    nsSVGEffects::InvalidateDirectRenderingObservers(GetParent());
+  }
+
+  return nsFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
+}
+
+// -------------------------------------------------------------------------
+// Public functions
+// -------------------------------------------------------------------------
+
+nsIFrame* NS_NewSVGStopFrame(nsIPresShell*   aPresShell,
+                             nsStyleContext* aContext)
+{
+  return new (aPresShell) nsSVGStopFrame(aContext);
+}