import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

image/SurfaceCacheUtils.h

@@ -0,0 +1,34 @@
+/* -*- 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_image_SurfaceCacheUtils_h
+#define mozilla_image_SurfaceCacheUtils_h
+
+/**
+ * SurfaceCacheUtils provides an ImageLib-external API to interact with
+ * ImageLib's SurfaceCache.
+ */
+
+namespace mozilla {
+namespace image {
+
+class SurfaceCacheUtils
+{
+public:
+  /**
+   * Evicts all evictable entries from the surface cache.
+   *
+   * See the documentation for SurfaceCache::DiscardAll() for the details.
+   */
+  static void DiscardAll();
+
+private:
+  virtual ~SurfaceCacheUtils() = 0;  // Forbid instantiation.
+};
+
+} // namespace image
+} // namespace mozilla
+
+#endif // mozilla_image_SurfaceCacheUtils_h