1 files changed, 170 insertions, 0 deletions
diff --git a/layout/svg/SVGFEImageFrame.cpp b/layout/svg/SVGFEImageFrame.cpp
new file mode 100644
index 0000000000..2070348db5
--- /dev/null
+++ b/layout/svg/SVGFEImageFrame.cpp
@@ -0,0 +1,170 @@
+/* -*- 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/SVGFEImageElement.h"
+#include "mozilla/dom/MutationEventBinding.h"
+#include "nsContainerFrame.h"
+#include "nsIFrame.h"
+#include "nsGkAtoms.h"
+#include "nsLiteralString.h"
+
+using namespace mozilla::dom;
+
+nsIFrame* NS_NewSVGFEImageFrame(mozilla::PresShell* aPresShell,
+                                mozilla::ComputedStyle* aStyle);
+
+namespace mozilla {
+
+class SVGFEImageFrame final : public nsIFrame {
+  friend nsIFrame* ::NS_NewSVGFEImageFrame(mozilla::PresShell* aPresShell,
+                                           ComputedStyle* aStyle);
+
+ protected:
+  explicit SVGFEImageFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
+      : nsIFrame(aStyle, aPresContext, kClassID) {
+    AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY);
+
+    // This frame isn't actually displayed, but it contains an image and we want
+    // to use the nsImageLoadingContent machinery for managing images, which
+    // requires visibility tracking, so we enable visibility tracking and
+    // forcibly mark it visible below.
+    EnableVisibilityTracking();
+  }
+
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(SVGFEImageFrame)
+
+  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
+                    nsIFrame* aPrevInFlow) override;
+  void Destroy(DestroyContext&) override;
+
+  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"SVGFEImage"_ns, aResult);
+  }
+#endif
+
+  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                    int32_t aModType) override;
+
+  void OnVisibilityChange(
+      Visibility aNewVisibility,
+      const Maybe<OnNonvisible>& aNonvisibleAction = Nothing()) override;
+
+  bool ComputeCustomOverflow(OverflowAreas& aOverflowAreas) override {
+    // We don't maintain a ink overflow rect
+    return false;
+  }
+};
+
+}  // namespace mozilla
+
+nsIFrame* NS_NewSVGFEImageFrame(mozilla::PresShell* aPresShell,
+                                mozilla::ComputedStyle* aStyle) {
+  return new (aPresShell)
+      mozilla::SVGFEImageFrame(aStyle, aPresShell->GetPresContext());
+}
+
+namespace mozilla {
+
+NS_IMPL_FRAMEARENA_HELPERS(SVGFEImageFrame)
+
+/* virtual */
+void SVGFEImageFrame::Destroy(DestroyContext& aContext) {
+  DecApproximateVisibleCount();
+
+  nsCOMPtr<nsIImageLoadingContent> imageLoader =
+      do_QueryInterface(nsIFrame::mContent);
+  if (imageLoader) {
+    imageLoader->FrameDestroyed(this);
+  }
+
+  nsIFrame::Destroy(aContext);
+}
+
+void SVGFEImageFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
+                           nsIFrame* aPrevInFlow) {
+  NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::feImage),
+               "Trying to construct an SVGFEImageFrame for a "
+               "content element that doesn't support the right interfaces");
+
+  nsIFrame::Init(aContent, aParent, aPrevInFlow);
+
+  // We assume that feImage's are always visible.
+  // This call must happen before the FrameCreated. This is because the
+  // primary frame pointer on our content node isn't set until after this
+  // function ends, so there is no way for the resulting OnVisibilityChange
+  // notification to get a frame. FrameCreated has a workaround for this in
+  // that it passes our frame around so it can be accessed. OnVisibilityChange
+  // doesn't have that workaround.
+  IncApproximateVisibleCount();
+
+  nsCOMPtr<nsIImageLoadingContent> imageLoader =
+      do_QueryInterface(nsIFrame::mContent);
+  if (imageLoader) {
+    imageLoader->FrameCreated(this);
+  }
+}
+
+nsresult SVGFEImageFrame::AttributeChanged(int32_t aNameSpaceID,
+                                           nsAtom* aAttribute,
+                                           int32_t aModType) {
+  SVGFEImageElement* element = static_cast<SVGFEImageElement*>(GetContent());
+  if (element->AttributeAffectsRendering(aNameSpaceID, aAttribute)) {
+    MOZ_ASSERT(
+        GetParent()->IsSVGFilterFrame(),
+        "Observers observe the filter, so that's what we must invalidate");
+    SVGObserverUtils::InvalidateDirectRenderingObservers(GetParent());
+  }
+
+  // Currently our SMIL implementation does not modify the DOM attributes. Once
+  // we implement the SVG 2 SMIL behaviour this can be removed
+  // SVGFEImageElement::AfterSetAttr's implementation will be sufficient.
+  if (aModType == MutationEvent_Binding::SMIL &&
+      aAttribute == nsGkAtoms::href &&
+      (aNameSpaceID == kNameSpaceID_XLink ||
+       aNameSpaceID == kNameSpaceID_None)) {
+    bool hrefIsSet =
+        element->mStringAttributes[SVGFEImageElement::HREF].IsExplicitlySet() ||
+        element->mStringAttributes[SVGFEImageElement::XLINK_HREF]
+            .IsExplicitlySet();
+    if (hrefIsSet) {
+      element->LoadSVGImage(true, true);
+    } else {
+      element->CancelImageRequests(true);
+    }
+  }
+
+  return nsIFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
+}
+
+void SVGFEImageFrame::OnVisibilityChange(
+    Visibility aNewVisibility, const Maybe<OnNonvisible>& aNonvisibleAction) {
+  nsCOMPtr<nsIImageLoadingContent> imageLoader =
+      do_QueryInterface(nsIFrame::mContent);
+  if (!imageLoader) {
+    MOZ_ASSERT_UNREACHABLE("Should have an nsIImageLoadingContent");
+    nsIFrame::OnVisibilityChange(aNewVisibility, aNonvisibleAction);
+    return;
+  }
+
+  imageLoader->OnVisibilityChange(aNewVisibility, aNonvisibleAction);
+
+  nsIFrame::OnVisibilityChange(aNewVisibility, aNonvisibleAction);
+}
+
+}  // namespace mozilla