1 files changed, 97 insertions, 0 deletions
diff --git a/layout/svg/SVGStopFrame.cpp b/layout/svg/SVGStopFrame.cpp
new file mode 100644
index 0000000000..d1690be6e5
--- /dev/null
+++ b/layout/svg/SVGStopFrame.cpp
@@ -0,0 +1,97 @@
+/* -*- 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/. */
+
+// Keep in (case-insensitive) order:
+#include "nsContainerFrame.h"
+#include "nsIFrame.h"
+#include "nsGkAtoms.h"
+#include "mozilla/ComputedStyle.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/SVGGradientFrame.h"
+#include "mozilla/SVGObserverUtils.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 SVGGradientFrame, which is the parent for this frame
+
+nsIFrame* NS_NewSVGStopFrame(mozilla::PresShell* aPresShell,
+                             mozilla::ComputedStyle* aStyle);
+
+namespace mozilla {
+
+class SVGStopFrame : public nsIFrame {
+  friend nsIFrame* ::NS_NewSVGStopFrame(mozilla::PresShell* aPresShell,
+                                        ComputedStyle* aStyle);
+
+ protected:
+  explicit SVGStopFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
+      : nsIFrame(aStyle, aPresContext, kClassID) {
+    AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY);
+  }
+
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(SVGStopFrame)
+
+  // nsIFrame interface:
+#ifdef DEBUG
+  void Init(nsIContent* aContent, nsContainerFrame* aParent,
+            nsIFrame* aPrevInFlow) override;
+#endif
+
+  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                        const nsDisplayListSet& aLists) override {}
+
+  nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                            int32_t aModType) override;
+
+#ifdef DEBUG_FRAME_DUMP
+  nsresult GetFrameName(nsAString& aResult) const override {
+    return MakeFrameName(u"SVGStop"_ns, aResult);
+  }
+#endif
+};
+
+//----------------------------------------------------------------------
+// Implementation
+
+NS_IMPL_FRAMEARENA_HELPERS(SVGStopFrame)
+
+//----------------------------------------------------------------------
+// nsIFrame methods:
+
+#ifdef DEBUG
+void SVGStopFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
+                        nsIFrame* aPrevInFlow) {
+  NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::stop),
+               "Content is not a stop element");
+
+  nsIFrame::Init(aContent, aParent, aPrevInFlow);
+}
+#endif /* DEBUG */
+
+nsresult SVGStopFrame::AttributeChanged(int32_t aNameSpaceID,
+                                        nsAtom* aAttribute, int32_t aModType) {
+  if (aNameSpaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::offset) {
+    MOZ_ASSERT(
+        static_cast<SVGGradientFrame*>(do_QueryFrame(GetParent())),
+        "Observers observe the gradient, so that's what we must invalidate");
+    SVGObserverUtils::InvalidateRenderingObservers(GetParent());
+  }
+
+  return nsIFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
+}
+
+}  // namespace mozilla
+
+// -------------------------------------------------------------------------
+// Public functions
+// -------------------------------------------------------------------------
+
+nsIFrame* NS_NewSVGStopFrame(mozilla::PresShell* aPresShell,
+                             mozilla::ComputedStyle* aStyle) {
+  return new (aPresShell)
+      mozilla::SVGStopFrame(aStyle, aPresShell->GetPresContext());
+}