diff -r 000000000000 -r 6474c204b198 layout/svg/nsSVGAFrame.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/svg/nsSVGAFrame.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,157 @@
+/* -*- 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 "gfxMatrix.h"
+#include "mozilla/dom/SVGAElement.h"
+#include "nsSVGContainerFrame.h"
+#include "nsSVGIntegrationUtils.h"
+#include "nsSVGUtils.h"
+#include "SVGLengthList.h"
+
+using namespace mozilla;
+
+typedef nsSVGDisplayContainerFrame nsSVGAFrameBase;
+
+class nsSVGAFrame : public nsSVGAFrameBase
+{
+  friend nsIFrame*
+  NS_NewSVGAFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+protected:
+  nsSVGAFrame(nsStyleContext* aContext) :
+    nsSVGAFrameBase(aContext) {}
+
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+#ifdef DEBUG
+  virtual void Init(nsIContent*      aContent,
+                    nsIFrame*        aParent,
+                    nsIFrame*        aPrevInFlow) MOZ_OVERRIDE;
+#endif
+
+  // nsIFrame:
+  virtual nsresult  AttributeChanged(int32_t         aNameSpaceID,
+                                     nsIAtom*        aAttribute,
+                                     int32_t         aModType) MOZ_OVERRIDE;
+
+  /**
+   * Get the "type" of the frame
+   *
+   * @see nsGkAtoms::svgAFrame
+   */
+  virtual nsIAtom* GetType() const MOZ_OVERRIDE;
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE
+  {
+    return MakeFrameName(NS_LITERAL_STRING("SVGA"), aResult);
+  }
+#endif
+  // nsISVGChildFrame interface:
+  virtual void NotifySVGChanged(uint32_t aFlags) MOZ_OVERRIDE;
+  
+  // nsSVGContainerFrame methods:
+  virtual gfxMatrix GetCanvasTM(uint32_t aFor,
+                                nsIFrame* aTransformRoot = nullptr) MOZ_OVERRIDE;
+
+private:
+  nsAutoPtr<gfxMatrix> mCanvasTM;
+};
+
+//----------------------------------------------------------------------
+// Implementation
+
+nsIFrame*
+NS_NewSVGAFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+{
+  return new (aPresShell) nsSVGAFrame(aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsSVGAFrame)
+
+//----------------------------------------------------------------------
+// nsIFrame methods
+#ifdef DEBUG
+void
+nsSVGAFrame::Init(nsIContent* aContent,
+                  nsIFrame* aParent,
+                  nsIFrame* aPrevInFlow)
+{
+  NS_ASSERTION(aContent->IsSVG(nsGkAtoms::a),
+               "Trying to construct an SVGAFrame for a "
+               "content element that doesn't support the right interfaces");
+
+  nsSVGAFrameBase::Init(aContent, aParent, aPrevInFlow);
+}
+#endif /* DEBUG */
+
+nsresult
+nsSVGAFrame::AttributeChanged(int32_t         aNameSpaceID,
+                              nsIAtom*        aAttribute,
+                              int32_t         aModType)
+{
+  if (aNameSpaceID == kNameSpaceID_None &&
+      aAttribute == nsGkAtoms::transform) {
+    // We don't invalidate for transform changes (the layers code does that).
+    // Also note that SVGTransformableElement::GetAttributeChangeHint will
+    // return nsChangeHint_UpdateOverflow for "transform" attribute changes
+    // and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
+    NotifySVGChanged(TRANSFORM_CHANGED);
+  }
+
+ return NS_OK;
+}
+
+nsIAtom *
+nsSVGAFrame::GetType() const
+{
+  return nsGkAtoms::svgAFrame;
+}
+
+//----------------------------------------------------------------------
+// nsISVGChildFrame methods
+
+void
+nsSVGAFrame::NotifySVGChanged(uint32_t aFlags)
+{
+  NS_ABORT_IF_FALSE(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
+                    "Invalidation logic may need adjusting");
+
+  if (aFlags & TRANSFORM_CHANGED) {
+    // make sure our cached transform matrix gets (lazily) updated
+    mCanvasTM = nullptr;
+  }
+
+  nsSVGAFrameBase::NotifySVGChanged(aFlags);
+}
+
+//----------------------------------------------------------------------
+// nsSVGContainerFrame methods:
+
+gfxMatrix
+nsSVGAFrame::GetCanvasTM(uint32_t aFor, nsIFrame* aTransformRoot)
+{
+  if (!(GetStateBits() & NS_FRAME_IS_NONDISPLAY) && !aTransformRoot) {
+    if ((aFor == FOR_PAINTING && NS_SVGDisplayListPaintingEnabled()) ||
+        (aFor == FOR_HIT_TESTING && NS_SVGDisplayListHitTestingEnabled())) {
+      return nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(this);
+    }
+  }
+  if (!mCanvasTM) {
+    NS_ASSERTION(mParent, "null parent");
+
+    nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(mParent);
+    dom::SVGAElement *content = static_cast<dom::SVGAElement*>(mContent);
+
+    gfxMatrix tm = content->PrependLocalTransformsTo(
+        this == aTransformRoot ? gfxMatrix() :
+                                 parent->GetCanvasTM(aFor, aTransformRoot));
+
+    mCanvasTM = new gfxMatrix(tm);
+  }
+
+  return *mCanvasTM;
+}