/* vim: se cin sw=2 ts=2 et : */
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#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"

namespace mozilla {
namespace widget {  

class GfxInfoBase : public nsIGfxInfo,
                    public nsIObserver,
                    public nsSupportsWeakReference
{
public:
  GfxInfoBase();
  virtual ~GfxInfoBase();

  NS_DECL_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_SCRIPTABLE NS_IMETHOD GetFeatureStatus(PRInt32 aFeature, PRInt32 *_retval NS_OUTPARAM);
  NS_SCRIPTABLE NS_IMETHOD GetFeatureSuggestedDriverVersion(PRInt32 aFeature, nsAString & _retval NS_OUTPARAM);
  NS_SCRIPTABLE NS_IMETHOD GetWebGLParameter(const nsAString & aParam, nsAString & _retval NS_OUTPARAM);

  NS_SCRIPTABLE NS_IMETHOD GetFailures(PRUint32 *failureCount NS_OUTPARAM, char ***failures NS_OUTPARAM);
  NS_IMETHOD_(void) LogFailure(const nsACString &failure);

  // 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();
  
  // Gets the driver info table. Used by GfxInfoBase to check for general cases
  // (while subclasses check for more specific ones).
  virtual const GfxDriverInfo* GetGfxDriverInfo() = 0;

  // only useful on X11
  NS_IMETHOD_(void) GetData() { }

protected:

  virtual nsresult GetFeatureStatusImpl(PRInt32 aFeature, PRInt32* aStatus,
                                        nsAString& aSuggestedDriverVersion,
                                        GfxDriverInfo* aDriverInfo = nsnull,
                                        OperatingSystem* aOS = nsnull);

private:

  void EvaluateDownloadedBlacklist(nsTArray<GfxDriverInfo>& aDriverInfo);

  nsCString mFailures[9]; // The choice of 9 is Ehsan's
  PRUint32 mFailureCount;

};

}
}

#endif /* __mozilla_widget_GfxInfoBase_h__ */
