1 files changed, 105 insertions, 0 deletions
diff --git a/layout/svg/SVGFELeafFrame.cpp b/layout/svg/SVGFELeafFrame.cpp
new file mode 100644
index 0000000000..c49ae429b4
--- /dev/null
+++ b/layout/svg/SVGFELeafFrame.cpp
@@ -0,0 +1,105 @@
+/* -*- 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 "mozilla/PresShell.h"
+#include "mozilla/SVGObserverUtils.h"
+#include "mozilla/dom/SVGFilters.h"
+#include "ComputedStyle.h"
+#include "nsContainerFrame.h"
+#include "nsIFrame.h"
+#include "nsGkAtoms.h"
+
+using namespace mozilla::dom;
+
+nsIFrame* NS_NewSVGFELeafFrame(mozilla::PresShell* aPresShell,
+                               mozilla::ComputedStyle* aStyle);
+namespace mozilla {
+
+/*
+ * This frame is used by filter primitive elements that don't
+ * have special child elements that provide parameters.
+ */
+class SVGFELeafFrame final : public nsIFrame {
+  friend nsIFrame* ::NS_NewSVGFELeafFrame(mozilla::PresShell* aPresShell,
+                                          ComputedStyle* aStyle);
+
+ protected:
+  explicit SVGFELeafFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
+      : nsIFrame(aStyle, aPresContext, kClassID) {
+    AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY);
+  }
+
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(SVGFELeafFrame)
+
+#ifdef DEBUG
+  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
+                    nsIFrame* aPrevInFlow) override;
+#endif
+
+  bool IsFrameOfType(uint32_t aFlags) const override {
+    if (aFlags & eSupportsContainLayoutAndPaint) {
+      return false;
+    }
+
+    return nsIFrame::IsFrameOfType(aFlags & ~(nsIFrame::eSVG));
+  }
+
+#ifdef DEBUG_FRAME_DUMP
+  nsresult GetFrameName(nsAString& aResult) const override {
+    return MakeFrameName(u"SVGFELeaf"_ns, aResult);
+  }
+#endif
+
+  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                    int32_t aModType) override;
+
+  bool ComputeCustomOverflow(OverflowAreas& aOverflowAreas) override {
+    // We don't maintain a ink overflow rect
+    return false;
+  }
+};
+
+}  // namespace mozilla
+
+nsIFrame* NS_NewSVGFELeafFrame(mozilla::PresShell* aPresShell,
+                               mozilla::ComputedStyle* aStyle) {
+  return new (aPresShell)
+      mozilla::SVGFELeafFrame(aStyle, aPresShell->GetPresContext());
+}
+
+namespace mozilla {
+
+NS_IMPL_FRAMEARENA_HELPERS(SVGFELeafFrame)
+
+#ifdef DEBUG
+void SVGFELeafFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
+                          nsIFrame* aPrevInFlow) {
+  nsCOMPtr<SVGFE> filterPrimitive = do_QueryInterface(aContent);
+  NS_ASSERTION(filterPrimitive,
+               "Trying to construct an SVGFELeafFrame for a "
+               "content element that doesn't support the right interfaces");
+
+  nsIFrame::Init(aContent, aParent, aPrevInFlow);
+}
+#endif /* DEBUG */
+
+nsresult SVGFELeafFrame::AttributeChanged(int32_t aNameSpaceID,
+                                          nsAtom* aAttribute,
+                                          int32_t aModType) {
+  auto* element = static_cast<mozilla::dom::SVGFE*>(GetContent());
+  if (element->AttributeAffectsRendering(aNameSpaceID, aAttribute)) {
+    MOZ_ASSERT(
+        GetParent()->IsSVGFilterFrame(),
+        "Observers observe the filter, so that's what we must invalidate");
+    SVGObserverUtils::InvalidateDirectRenderingObservers(GetParent());
+  }
+
+  return nsIFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
+}
+
+}  // namespace mozilla