1 files changed, 150 insertions, 0 deletions
diff --git a/dom/svg/SVGTransformableElement.cpp b/dom/svg/SVGTransformableElement.cpp
new file mode 100644
index 0000000000..adbbe10719
--- /dev/null
+++ b/dom/svg/SVGTransformableElement.cpp
@@ -0,0 +1,150 @@
+/* -*- 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 "SVGTransformableElement.h"
+
+#include "DOMSVGAnimatedTransformList.h"
+#include "mozilla/dom/MutationEventBinding.h"
+#include "nsContentUtils.h"
+#include "nsIFrame.h"
+
+using namespace mozilla::gfx;
+
+namespace mozilla::dom {
+
+already_AddRefed<DOMSVGAnimatedTransformList>
+SVGTransformableElement::Transform() {
+  // We're creating a DOM wrapper, so we must tell GetAnimatedTransformList
+  // to allocate the DOMSVGAnimatedTransformList if it hasn't already done so:
+  return DOMSVGAnimatedTransformList::GetDOMWrapper(
+      GetAnimatedTransformList(DO_ALLOCATE), this);
+}
+
+//----------------------------------------------------------------------
+// nsIContent methods
+
+nsChangeHint SVGTransformableElement::GetAttributeChangeHint(
+    const nsAtom* aAttribute, int32_t aModType) const {
+  nsChangeHint retval =
+      SVGElement::GetAttributeChangeHint(aAttribute, aModType);
+  if (aAttribute == nsGkAtoms::transform ||
+      aAttribute == nsGkAtoms::mozAnimateMotionDummyAttr) {
+    nsIFrame* frame = GetPrimaryFrame();
+    retval |= nsChangeHint_InvalidateRenderingObservers;
+    if (!frame || frame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
+      return retval;
+    }
+
+    bool isAdditionOrRemoval = false;
+    if (aModType == MutationEvent_Binding::ADDITION ||
+        aModType == MutationEvent_Binding::REMOVAL) {
+      isAdditionOrRemoval = true;
+    } else {
+      MOZ_ASSERT(aModType == MutationEvent_Binding::MODIFICATION,
+                 "Unknown modification type.");
+      if (!mTransforms || !mTransforms->HasTransform()) {
+        // New value is empty, treat as removal.
+        // FIXME: Should we just rely on CreatedOrRemovedOnLastChange?
+        isAdditionOrRemoval = true;
+      } else if (mTransforms->CreatedOrRemovedOnLastChange()) {
+        // Old value was empty, treat as addition.
+        isAdditionOrRemoval = true;
+      }
+    }
+
+    if (isAdditionOrRemoval) {
+      retval |= nsChangeHint_ComprehensiveAddOrRemoveTransform;
+    } else {
+      // We just assume the old and new transforms are different.
+      retval |= nsChangeHint_UpdatePostTransformOverflow |
+                nsChangeHint_UpdateTransformLayer;
+    }
+  }
+  return retval;
+}
+
+bool SVGTransformableElement::IsEventAttributeNameInternal(nsAtom* aName) {
+  return nsContentUtils::IsEventAttributeName(aName, EventNameType_SVGGraphic);
+}
+
+//----------------------------------------------------------------------
+// SVGElement overrides
+
+gfxMatrix SVGTransformableElement::PrependLocalTransformsTo(
+    const gfxMatrix& aMatrix, SVGTransformTypes aWhich) const {
+  if (aWhich == eChildToUserSpace) {
+    // We don't have any eUserSpaceToParent transforms. (Sub-classes that do
+    // must override this function and handle that themselves.)
+    return aMatrix;
+  }
+  return GetUserToParentTransform(mAnimateMotionTransform.get(),
+                                  mTransforms.get()) *
+         aMatrix;
+}
+
+const gfx::Matrix* SVGTransformableElement::GetAnimateMotionTransform() const {
+  return mAnimateMotionTransform.get();
+}
+
+void SVGTransformableElement::SetAnimateMotionTransform(
+    const gfx::Matrix* aMatrix) {
+  if ((!aMatrix && !mAnimateMotionTransform) ||
+      (aMatrix && mAnimateMotionTransform &&
+       aMatrix->FuzzyEquals(*mAnimateMotionTransform))) {
+    return;
+  }
+  bool transformSet = mTransforms && mTransforms->IsExplicitlySet();
+  bool prevSet = mAnimateMotionTransform || transformSet;
+  mAnimateMotionTransform =
+      aMatrix ? MakeUnique<gfx::Matrix>(*aMatrix) : nullptr;
+  bool nowSet = mAnimateMotionTransform || transformSet;
+  int32_t modType;
+  if (prevSet && !nowSet) {
+    modType = MutationEvent_Binding::REMOVAL;
+  } else if (!prevSet && nowSet) {
+    modType = MutationEvent_Binding::ADDITION;
+  } else {
+    modType = MutationEvent_Binding::MODIFICATION;
+  }
+  DidAnimateTransformList(modType);
+  nsIFrame* frame = GetPrimaryFrame();
+  if (frame) {
+    // If the result of this transform and any other transforms on this frame
+    // is the identity matrix, then DoApplyRenderingChangeToTree won't handle
+    // our nsChangeHint_UpdateTransformLayer hint since aFrame->IsTransformed()
+    // will return false. That's fine, but we still need to schedule a repaint,
+    // and that won't otherwise happen. Since it's cheap to call SchedulePaint,
+    // we don't bother to check IsTransformed().
+    frame->SchedulePaint();
+  }
+}
+
+SVGAnimatedTransformList* SVGTransformableElement::GetAnimatedTransformList(
+    uint32_t aFlags) {
+  if (!mTransforms && (aFlags & DO_ALLOCATE)) {
+    mTransforms = MakeUnique<SVGAnimatedTransformList>();
+  }
+  return mTransforms.get();
+}
+
+/* static */
+gfxMatrix SVGTransformableElement::GetUserToParentTransform(
+    const gfx::Matrix* aAnimateMotionTransform,
+    const SVGAnimatedTransformList* aTransforms) {
+  gfxMatrix result;
+
+  if (aAnimateMotionTransform) {
+    result.PreMultiply(ThebesMatrix(*aAnimateMotionTransform));
+  }
+
+  if (aTransforms) {
+    result.PreMultiply(aTransforms->GetAnimValue().GetConsolidationMatrix());
+  }
+
+  return result;
+}
+
+}  // namespace mozilla::dom