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-rw-r--r--layout/svg/SVGFEImageFrame.cpp155
1 files changed, 155 insertions, 0 deletions
diff --git a/layout/svg/SVGFEImageFrame.cpp b/layout/svg/SVGFEImageFrame.cpp
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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/. */
+
+// 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)
+
+ void Init(nsIContent* aContent, nsContainerFrame* aParent,
+ nsIFrame* aPrevInFlow) override;
+ void Destroy(DestroyContext&) override;
+
+#ifdef DEBUG_FRAME_DUMP
+ nsresult GetFrameName(nsAString& aResult) const override {
+ return MakeFrameName(u"SVGFEImage"_ns, aResult);
+ }
+#endif
+
+ 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(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(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::InvalidateRenderingObservers(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(mContent);
+ if (imageLoader) {
+ imageLoader->OnVisibilityChange(aNewVisibility, aNonvisibleAction);
+ }
+
+ nsIFrame::OnVisibilityChange(aNewVisibility, aNonvisibleAction);
+}
+
+} // namespace mozilla