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-rw-r--r--layout/svg/nsSVGUseFrame.cpp259
1 files changed, 259 insertions, 0 deletions
diff --git a/layout/svg/nsSVGUseFrame.cpp b/layout/svg/nsSVGUseFrame.cpp
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+++ b/layout/svg/nsSVGUseFrame.cpp
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+/* -*- 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 "nsIAnonymousContentCreator.h"
+#include "nsSVGEffects.h"
+#include "nsSVGGFrame.h"
+#include "mozilla/dom/SVGUseElement.h"
+#include "nsContentList.h"
+
+using namespace mozilla::dom;
+
+class nsSVGUseFrame : public nsSVGGFrame
+ , public nsIAnonymousContentCreator
+{
+ friend nsIFrame*
+ NS_NewSVGUseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+protected:
+ explicit nsSVGUseFrame(nsStyleContext* aContext)
+ : nsSVGGFrame(aContext)
+ , mHasValidDimensions(true)
+ {}
+
+public:
+ NS_DECL_QUERYFRAME
+ NS_DECL_FRAMEARENA_HELPERS
+
+ // nsIFrame interface:
+ virtual void Init(nsIContent* aContent,
+ nsContainerFrame* aParent,
+ nsIFrame* aPrevInFlow) override;
+
+ virtual nsresult AttributeChanged(int32_t aNameSpaceID,
+ nsIAtom* aAttribute,
+ int32_t aModType) override;
+
+ virtual void DestroyFrom(nsIFrame* aDestructRoot) override;
+
+ /**
+ * Get the "type" of the frame
+ *
+ * @see nsGkAtoms::svgUseFrame
+ */
+ virtual nsIAtom* GetType() const override;
+
+ virtual bool IsLeaf() const override;
+
+#ifdef DEBUG_FRAME_DUMP
+ virtual nsresult GetFrameName(nsAString& aResult) const override
+ {
+ return MakeFrameName(NS_LITERAL_STRING("SVGUse"), aResult);
+ }
+#endif
+
+ // nsISVGChildFrame interface:
+ virtual void ReflowSVG() override;
+ virtual void NotifySVGChanged(uint32_t aFlags) override;
+
+ // nsIAnonymousContentCreator
+ virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) override;
+ virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
+ uint32_t aFilter) override;
+
+private:
+ bool mHasValidDimensions;
+};
+
+//----------------------------------------------------------------------
+// Implementation
+
+nsIFrame*
+NS_NewSVGUseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+{
+ return new (aPresShell) nsSVGUseFrame(aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsSVGUseFrame)
+
+nsIAtom *
+nsSVGUseFrame::GetType() const
+{
+ return nsGkAtoms::svgUseFrame;
+}
+
+//----------------------------------------------------------------------
+// nsQueryFrame methods
+
+NS_QUERYFRAME_HEAD(nsSVGUseFrame)
+ NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
+NS_QUERYFRAME_TAIL_INHERITING(nsSVGGFrame)
+
+//----------------------------------------------------------------------
+// nsIFrame methods:
+
+void
+nsSVGUseFrame::Init(nsIContent* aContent,
+ nsContainerFrame* aParent,
+ nsIFrame* aPrevInFlow)
+{
+ NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::use),
+ "Content is not an SVG use!");
+
+ mHasValidDimensions =
+ static_cast<SVGUseElement*>(aContent)->HasValidDimensions();
+
+ nsSVGGFrame::Init(aContent, aParent, aPrevInFlow);
+}
+
+nsresult
+nsSVGUseFrame::AttributeChanged(int32_t aNameSpaceID,
+ nsIAtom* aAttribute,
+ int32_t aModType)
+{
+ SVGUseElement *useElement = static_cast<SVGUseElement*>(mContent);
+
+ if (aNameSpaceID == kNameSpaceID_None) {
+ if (aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y) {
+ // make sure our cached transform matrix gets (lazily) updated
+ mCanvasTM = nullptr;
+ nsLayoutUtils::PostRestyleEvent(
+ useElement, nsRestyleHint(0),
+ nsChangeHint_InvalidateRenderingObservers);
+ nsSVGUtils::ScheduleReflowSVG(this);
+ nsSVGUtils::NotifyChildrenOfSVGChange(this, TRANSFORM_CHANGED);
+ } else if (aAttribute == nsGkAtoms::width ||
+ aAttribute == nsGkAtoms::height) {
+ bool invalidate = false;
+ if (mHasValidDimensions != useElement->HasValidDimensions()) {
+ mHasValidDimensions = !mHasValidDimensions;
+ invalidate = true;
+ }
+ if (useElement->OurWidthAndHeightAreUsed()) {
+ invalidate = true;
+ useElement->SyncWidthOrHeight(aAttribute);
+ }
+ if (invalidate) {
+ nsLayoutUtils::PostRestyleEvent(
+ useElement, nsRestyleHint(0),
+ nsChangeHint_InvalidateRenderingObservers);
+ nsSVGUtils::ScheduleReflowSVG(this);
+ }
+ }
+ }
+
+ if ((aNameSpaceID == kNameSpaceID_XLink ||
+ aNameSpaceID == kNameSpaceID_None) &&
+ aAttribute == nsGkAtoms::href) {
+ // we're changing our nature, clear out the clone information
+ nsLayoutUtils::PostRestyleEvent(
+ useElement, nsRestyleHint(0),
+ nsChangeHint_InvalidateRenderingObservers);
+ nsSVGUtils::ScheduleReflowSVG(this);
+ useElement->mOriginal = nullptr;
+ useElement->UnlinkSource();
+ useElement->TriggerReclone();
+ }
+
+ return nsSVGGFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
+}
+
+void
+nsSVGUseFrame::DestroyFrom(nsIFrame* aDestructRoot)
+{
+ RefPtr<SVGUseElement> use = static_cast<SVGUseElement*>(mContent);
+ nsSVGGFrame::DestroyFrom(aDestructRoot);
+ use->DestroyAnonymousContent();
+}
+
+bool
+nsSVGUseFrame::IsLeaf() const
+{
+ return true;
+}
+
+
+//----------------------------------------------------------------------
+// nsISVGChildFrame methods
+
+void
+nsSVGUseFrame::ReflowSVG()
+{
+ // We only handle x/y offset here, since any width/height that is in force is
+ // handled by the nsSVGOuterSVGFrame for the anonymous <svg> that will be
+ // created for that purpose.
+ float x, y;
+ static_cast<SVGUseElement*>(mContent)->
+ GetAnimatedLengthValues(&x, &y, nullptr);
+ mRect.MoveTo(nsLayoutUtils::RoundGfxRectToAppRect(
+ gfxRect(x, y, 0.0, 0.0),
+ PresContext()->AppUnitsPerCSSPixel()).TopLeft());
+
+ // If we have a filter, we need to invalidate ourselves because filter
+ // output can change even if none of our descendants need repainting.
+ if (StyleEffects()->HasFilters()) {
+ InvalidateFrame();
+ }
+
+ nsSVGGFrame::ReflowSVG();
+}
+
+void
+nsSVGUseFrame::NotifySVGChanged(uint32_t aFlags)
+{
+ if (aFlags & COORD_CONTEXT_CHANGED &&
+ !(aFlags & TRANSFORM_CHANGED)) {
+ // Coordinate context changes affect mCanvasTM if we have a
+ // percentage 'x' or 'y'
+ SVGUseElement *use = static_cast<SVGUseElement*>(mContent);
+ if (use->mLengthAttributes[SVGUseElement::ATTR_X].IsPercentage() ||
+ use->mLengthAttributes[SVGUseElement::ATTR_Y].IsPercentage()) {
+ aFlags |= TRANSFORM_CHANGED;
+ // Ancestor changes can't affect how we render from the perspective of
+ // any rendering observers that we may have, so we don't need to
+ // invalidate them. We also don't need to invalidate ourself, since our
+ // changed ancestor will have invalidated its entire area, which includes
+ // our area.
+ // For perf reasons we call this before calling NotifySVGChanged() below.
+ nsSVGUtils::ScheduleReflowSVG(this);
+ }
+ }
+
+ // We don't remove the TRANSFORM_CHANGED flag here if we have a viewBox or
+ // non-percentage width/height, since if they're set then they are cloned to
+ // an anonymous child <svg>, and its nsSVGInnerSVGFrame will do that.
+
+ nsSVGGFrame::NotifySVGChanged(aFlags);
+}
+
+//----------------------------------------------------------------------
+// nsIAnonymousContentCreator methods:
+
+nsresult
+nsSVGUseFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
+{
+ SVGUseElement *use = static_cast<SVGUseElement*>(mContent);
+
+ nsIContent* clone = use->CreateAnonymousContent();
+ nsLayoutUtils::PostRestyleEvent(
+ use, nsRestyleHint(0), nsChangeHint_InvalidateRenderingObservers);
+ if (!clone)
+ return NS_ERROR_FAILURE;
+ if (!aElements.AppendElement(clone))
+ return NS_ERROR_OUT_OF_MEMORY;
+ return NS_OK;
+}
+
+void
+nsSVGUseFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
+ uint32_t aFilter)
+{
+ SVGUseElement *use = static_cast<SVGUseElement*>(mContent);
+ nsIContent* clone = use->GetAnonymousContent();
+ if (clone) {
+ aElements.AppendElement(clone);
+ }
+}