1 files changed, 145 insertions, 0 deletions
diff --git a/layout/svg/SVGUseFrame.cpp b/layout/svg/SVGUseFrame.cpp
new file mode 100644
index 0000000000..c655f7b24f
--- /dev/null
+++ b/layout/svg/SVGUseFrame.cpp
@@ -0,0 +1,145 @@
+/* -*- 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/. */
+
+#include "SVGUseFrame.h"
+
+#include "mozilla/PresShell.h"
+#include "mozilla/SVGObserverUtils.h"
+#include "mozilla/SVGUtils.h"
+#include "mozilla/dom/MutationEvent.h"
+#include "mozilla/dom/SVGUseElement.h"
+#include "nsLayoutUtils.h"
+
+using namespace mozilla::dom;
+
+//----------------------------------------------------------------------
+// Implementation
+
+nsIFrame* NS_NewSVGUseFrame(mozilla::PresShell* aPresShell,
+                            mozilla::ComputedStyle* aStyle) {
+  return new (aPresShell)
+      mozilla::SVGUseFrame(aStyle, aPresShell->GetPresContext());
+}
+
+namespace mozilla {
+
+NS_IMPL_FRAMEARENA_HELPERS(SVGUseFrame)
+
+//----------------------------------------------------------------------
+// nsIFrame methods:
+
+void SVGUseFrame::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();
+
+  SVGGFrame::Init(aContent, aParent, aPrevInFlow);
+}
+
+nsresult SVGUseFrame::AttributeChanged(int32_t aNamespaceID, nsAtom* aAttribute,
+                                       int32_t aModType) {
+  // Currently our SMIL implementation does not modify the DOM attributes. Once
+  // we implement the SVG 2 SMIL behaviour this can be removed
+  // SVGUseElement::AfterSetAttr's implementation will be sufficient.
+  if (aModType == MutationEvent_Binding::SMIL) {
+    auto* content = SVGUseElement::FromNode(GetContent());
+    content->ProcessAttributeChange(aNamespaceID, aAttribute);
+  }
+
+  return SVGGFrame::AttributeChanged(aNamespaceID, aAttribute, aModType);
+}
+
+void SVGUseFrame::DidSetComputedStyle(ComputedStyle* aOldComputedStyle) {
+  SVGGFrame::DidSetComputedStyle(aOldComputedStyle);
+
+  if (!aOldComputedStyle) {
+    return;
+  }
+  const auto* newSVGReset = StyleSVGReset();
+  const auto* oldSVGReset = aOldComputedStyle->StyleSVGReset();
+
+  if (newSVGReset->mX != oldSVGReset->mX ||
+      newSVGReset->mY != oldSVGReset->mY) {
+    // make sure our cached transform matrix gets (lazily) updated
+    mCanvasTM = nullptr;
+    SVGUtils::ScheduleReflowSVG(this);
+    SVGUtils::NotifyChildrenOfSVGChange(this, TRANSFORM_CHANGED);
+  }
+}
+
+void SVGUseFrame::DimensionAttributeChanged(bool aHadValidDimensions,
+                                            bool aAttributeIsUsed) {
+  bool invalidate = aAttributeIsUsed;
+  if (mHasValidDimensions != aHadValidDimensions) {
+    mHasValidDimensions = !mHasValidDimensions;
+    invalidate = true;
+  }
+
+  if (invalidate) {
+    nsLayoutUtils::PostRestyleEvent(GetContent()->AsElement(), RestyleHint{0},
+                                    nsChangeHint_InvalidateRenderingObservers);
+    SVGUtils::ScheduleReflowSVG(this);
+  }
+}
+
+void SVGUseFrame::HrefChanged() {
+  nsLayoutUtils::PostRestyleEvent(GetContent()->AsElement(), RestyleHint{0},
+                                  nsChangeHint_InvalidateRenderingObservers);
+  SVGUtils::ScheduleReflowSVG(this);
+}
+
+//----------------------------------------------------------------------
+// ISVGDisplayableFrame methods
+
+void SVGUseFrame::ReflowSVG() {
+  // We only handle x/y offset here, since any width/height that is in force is
+  // handled by the SVGOuterSVGFrame for the anonymous <svg> that will be
+  // created for that purpose.
+  auto* content = SVGUseElement::FromNode(GetContent());
+  float x = SVGContentUtils::CoordToFloat(content, StyleSVGReset()->mX,
+                                          SVGContentUtils::X);
+  float y = SVGContentUtils::CoordToFloat(content, StyleSVGReset()->mY,
+                                          SVGContentUtils::Y);
+  mRect.MoveTo(nsLayoutUtils::RoundGfxRectToAppRect(gfxRect(x, y, 0, 0),
+                                                    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();
+  }
+
+  SVGGFrame::ReflowSVG();
+}
+
+void SVGUseFrame::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'
+    if (StyleSVGReset()->mX.HasPercent() || StyleSVGReset()->mY.HasPercent()) {
+      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.
+      SVGUtils::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 SVGInnerSVGFrame will do that.
+
+  SVGGFrame::NotifySVGChanged(aFlags);
+}
+
+}  // namespace mozilla