1 files changed, 133 insertions, 0 deletions
diff --git a/dom/svg/SVGAnimatedPathSegList.h b/dom/svg/SVGAnimatedPathSegList.h
new file mode 100644
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+++ b/dom/svg/SVGAnimatedPathSegList.h
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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/. */
+
+#ifndef MOZILLA_SVGANIMATEDPATHSEGLIST_H__
+#define MOZILLA_SVGANIMATEDPATHSEGLIST_H__
+
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"
+#include "nsAutoPtr.h"
+#include "nsISMILAttr.h"
+#include "SVGPathData.h"
+
+class nsSMILValue;
+class nsSVGElement;
+
+namespace mozilla {
+
+namespace dom {
+class SVGAnimationElement;
+} // namespace dom
+
+/**
+ * Class SVGAnimatedPathSegList
+ *
+ * Despite the fact that no SVGAnimatedPathSegList interface or objects exist
+ * in the SVG specification (unlike e.g. SVGAnimated*Length*List), we
+ * nevertheless have this internal class. (Note that there is an
+ * SVGAnimatedPathData interface, but that's quite different to
+ * SVGAnimatedLengthList since it is inherited by elements, as opposed to
+ * elements having members of that type.) The reason that we have this class is
+ * to provide a single locked down point of entry to the SVGPathData objects,
+ * which helps ensure that the DOM wrappers for SVGPathData objects' are always
+ * kept in sync. This is vitally important (see the comment in
+ * DOMSVGPathSegList::InternalListWillChangeTo) and frees consumers from having
+ * to know or worry about wrappers (or forget about them!) for the most part.
+ */
+class SVGAnimatedPathSegList final
+{
+  // friends so that they can get write access to mBaseVal and mAnimVal
+  friend class DOMSVGPathSeg;
+  friend class DOMSVGPathSegList;
+
+public:
+  SVGAnimatedPathSegList() {}
+
+  /**
+   * Because it's so important that mBaseVal and its DOMSVGPathSegList wrapper
+   * (if any) be kept in sync (see the comment in
+   * DOMSVGPathSegList::InternalListWillChangeTo), this method returns a const
+   * reference. Only our friend classes may get mutable references to mBaseVal.
+   */
+  const SVGPathData& GetBaseValue() const {
+    return mBaseVal;
+  }
+
+  nsresult SetBaseValueString(const nsAString& aValue);
+
+  void ClearBaseValue();
+
+  /**
+   * const! See comment for GetBaseValue!
+   */
+  const SVGPathData& GetAnimValue() const {
+    return mAnimVal ? *mAnimVal : mBaseVal;
+  }
+
+  nsresult SetAnimValue(const SVGPathData& aValue,
+                        nsSVGElement *aElement);
+
+  void ClearAnimValue(nsSVGElement *aElement);
+
+  /**
+   * Needed for correct DOM wrapper construction since GetAnimValue may
+   * actually return the baseVal!
+   */
+  void *GetBaseValKey() const {
+    return (void*)&mBaseVal;
+  }
+  void *GetAnimValKey() const {
+    return (void*)&mAnimVal;
+  }
+  
+  bool IsAnimating() const {
+    return !!mAnimVal;
+  }
+
+  /// Callers own the returned nsISMILAttr
+  nsISMILAttr* ToSMILAttr(nsSVGElement* aElement);
+
+  size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const;
+
+private:
+
+  // mAnimVal is a pointer to allow us to determine if we're being animated or
+  // not. Making it a non-pointer member and using mAnimVal.IsEmpty() to check
+  // if we're animating is not an option, since that would break animation *to*
+  // the empty string (<set to="">).
+
+  SVGPathData mBaseVal;
+  nsAutoPtr<SVGPathData> mAnimVal;
+
+  struct SMILAnimatedPathSegList : public nsISMILAttr
+  {
+  public:
+    SMILAnimatedPathSegList(SVGAnimatedPathSegList* aVal,
+                            nsSVGElement* aElement)
+      : mVal(aVal)
+      , mElement(aElement)
+    {}
+
+    // These will stay alive because a nsISMILAttr only lives as long
+    // as the Compositing step, and DOM elements don't get a chance to
+    // die during that.
+    SVGAnimatedPathSegList *mVal;
+    nsSVGElement *mElement;
+
+    // nsISMILAttr methods
+    virtual nsresult ValueFromString(const nsAString& aStr,
+                                     const dom::SVGAnimationElement* aSrcElement,
+                                     nsSMILValue& aValue,
+                                     bool& aPreventCachingOfSandwich) const override;
+    virtual nsSMILValue GetBaseValue() const override;
+    virtual void ClearAnimValue() override;
+    virtual nsresult SetAnimValue(const nsSMILValue& aValue) override;
+  };
+};
+
+} // namespace mozilla
+
+#endif // MOZILLA_SVGANIMATEDPATHSEGLIST_H__