diff -r 000000000000 -r 6474c204b198 widget/xpwidgets/GfxInfoBase.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/xpwidgets/GfxInfoBase.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,108 @@
+/* vim: se cin sw=2 ts=2 et : */
+/* -*- 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/. */
+
+#ifndef __mozilla_widget_GfxInfoBase_h__
+#define __mozilla_widget_GfxInfoBase_h__
+
+#include "nsIGfxInfo.h"
+#include "nsCOMPtr.h"
+#include "nsIObserver.h"
+#include "nsWeakReference.h"
+#include "GfxDriverInfo.h"
+#include "nsTArray.h"
+#include "nsString.h"
+#include "GfxInfoCollector.h"
+#include "nsIGfxInfoDebug.h"
+#include "mozilla/Mutex.h"
+#include "js/Value.h"
+#include "mozilla/Attributes.h"
+
+namespace mozilla {
+namespace widget {  
+
+class GfxInfoBase : public nsIGfxInfo,
+                    public nsIObserver,
+                    public nsSupportsWeakReference
+#ifdef DEBUG
+                  , public nsIGfxInfoDebug
+#endif
+{
+public:
+  GfxInfoBase();
+  virtual ~GfxInfoBase();
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+  // We only declare a subset of the nsIGfxInfo interface. It's up to derived
+  // classes to implement the rest of the interface.  
+  // Derived classes need to use
+  // using GfxInfoBase::GetFeatureStatus;
+  // using GfxInfoBase::GetFeatureSuggestedDriverVersion;
+  // using GfxInfoBase::GetWebGLParameter;
+  // to import the relevant methods into their namespace.
+  NS_IMETHOD GetFeatureStatus(int32_t aFeature, int32_t *_retval);
+  NS_IMETHOD GetFeatureSuggestedDriverVersion(int32_t aFeature, nsAString & _retval);
+  NS_IMETHOD GetWebGLParameter(const nsAString & aParam, nsAString & _retval);
+
+  NS_IMETHOD GetFailures(uint32_t *failureCount, char ***failures);
+  NS_IMETHOD_(void) LogFailure(const nsACString &failure);
+  NS_IMETHOD GetInfo(JSContext*, JS::MutableHandle<JS::Value>);
+
+  // Initialization function. If you override this, you must call this class's
+  // version of Init first.
+  // We need Init to be called separately from the constructor so we can
+  // register as an observer after all derived classes have been constructed
+  // and we know we have a non-zero refcount.
+  // Ideally, Init() would be void-return, but the rules of
+  // NS_GENERIC_FACTORY_CONSTRUCTOR_INIT require it be nsresult return.
+  virtual nsresult Init();
+  
+  // only useful on X11
+  NS_IMETHOD_(void) GetData() { }
+
+  static void AddCollector(GfxInfoCollectorBase* collector);
+  static void RemoveCollector(GfxInfoCollectorBase* collector);
+
+  static nsTArray<GfxDriverInfo>* mDriverInfo;
+  static bool mDriverInfoObserverInitialized;
+
+  virtual nsString Model() { return EmptyString(); }
+  virtual nsString Hardware() { return EmptyString(); }
+  virtual nsString Product() { return EmptyString(); }
+  virtual nsString Manufacturer() { return EmptyString(); }
+  virtual uint32_t OperatingSystemVersion() { return 0; }
+
+protected:
+
+  virtual nsresult GetFeatureStatusImpl(int32_t aFeature, int32_t* aStatus,
+                                        nsAString& aSuggestedDriverVersion,
+                                        const nsTArray<GfxDriverInfo>& aDriverInfo,
+                                        OperatingSystem* aOS = nullptr);
+
+  // Gets the driver info table. Used by GfxInfoBase to check for general cases
+  // (while subclasses check for more specific ones).
+  virtual const nsTArray<GfxDriverInfo>& GetGfxDriverInfo() = 0;
+
+private:
+  virtual int32_t FindBlocklistedDeviceInList(const nsTArray<GfxDriverInfo>& aDriverInfo,
+                                              nsAString& aSuggestedVersion,
+                                              int32_t aFeature,
+                                              OperatingSystem os);
+
+  void EvaluateDownloadedBlacklist(nsTArray<GfxDriverInfo>& aDriverInfo);
+
+  nsCString mFailures[9]; // The choice of 9 is Ehsan's
+  uint32_t mFailureCount;
+  Mutex mMutex;
+
+};
+
+}
+}
+
+#endif /* __mozilla_widget_GfxInfoBase_h__ */