layout/painting/PaintTracker.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_PaintTracker_h
   8 #define mozilla_PaintTracker_h
   9
  10 #include "mozilla/Attributes.h"
  11 #include "nsDebug.h"
  12
  13 namespace mozilla {
  14
  15 class MOZ_STACK_CLASS PaintTracker {
  16  public:
  17   PaintTracker() { ++gPaintTracker; }
  18   ~PaintTracker() {
  19     NS_ASSERTION(gPaintTracker > 0, "Mismatched constructor/destructor");
  20     --gPaintTracker;
  21   }
  22
  23   static bool IsPainting() { return !!gPaintTracker; }
  24
  25  private:
  26   static int gPaintTracker;
  27 };
  28
  29 }  // namespace mozilla
  30
  31 #endif  // mozilla_PaintTracker_h