Bug 764299 (Part 1) - Add hashing to SVGImageContext. r=dholbert

content/svg/content/src/SVGPreserveAspectRatio.h

@@ -3,8 +3,10 @@
  * 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/. */
 
-#pragma once
+#ifndef MOZILLA_CONTENT_SVGPRESERVEASPECTRATIO_H_
+#define MOZILLA_CONTENT_SVGPRESERVEASPECTRATIO_H_
 
+#include "mozilla/HashFunctions.h"  // for HashGeneric
 #include "mozilla/TypedEnum.h"
 
 #include "nsWrapperCache.h"
@@ -98,6 +100,10 @@ public:
     return mDefer;
   }
 
+  uint32_t Hash() const {
+    return HashGeneric(mAlign, mMeetOrSlice, mDefer);
+  }
+
 private:
   // We can't use enum types here because some compilers fail to pack them.
   uint8_t mAlign;
@@ -141,3 +147,5 @@ protected:
 
 } //namespace dom
 } //namespace mozilla
+
+#endif // MOZILLA_CONTENT_SVGPRESERVEASPECTRATIO_H_

layout/svg/SVGImageContext.h

@@ -16,6 +16,8 @@ namespace mozilla {
 class SVGImageContext
 {
 public:
+  SVGImageContext() { }
+
   SVGImageContext(SVGPreserveAspectRatio aPreserveAspectRatio)
     : mPreserveAspectRatio(aPreserveAspectRatio)
   { }
@@ -32,8 +34,12 @@ public:
     return !(*this == aOther);
   }
 
+  uint32_t Hash() const {
+    return mPreserveAspectRatio.Hash();
+  }
+
 private:
-  const SVGPreserveAspectRatio mPreserveAspectRatio;
+  SVGPreserveAspectRatio mPreserveAspectRatio;
 };
 
 } // namespace mozilla