gecko-dev/layout/painting/PaintTracker.h

/* -*- 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_PaintTracker_h
#define mozilla_PaintTracker_h

#include "mozilla/Attributes.h"
#include "nsDebug.h"

namespace mozilla {

class MOZ_STACK_CLASS PaintTracker {
 public:
  PaintTracker() { ++gPaintTracker; }
  ~PaintTracker() {
    NS_ASSERTION(gPaintTracker > 0, "Mismatched constructor/destructor");
    --gPaintTracker;
  }

  static bool IsPainting() { return !!gPaintTracker; }

 private:
  static int gPaintTracker;
};

}  // namespace mozilla

#endif  // mozilla_PaintTracker_h