import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

image/DecoderFlags.h

@@ -0,0 +1,42 @@
+/* -*- 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_DecoderFlags_h
+#define mozilla_image_DecoderFlags_h
+
+#include "mozilla/TypedEnumBits.h"
+
+namespace mozilla {
+namespace image {
+
+/**
+ * Flags that influence decoder behavior. Note that these flags *don't*
+ * influence the logical content of the surfaces that the decoder generates, so
+ * they're not in a factor in SurfaceCache lookups and the like. These flags
+ * instead either influence which surfaces are generated at all or the tune the
+ * decoder's behavior for a particular scenario.
+ */
+enum class DecoderFlags : uint8_t
+{
+  FIRST_FRAME_ONLY               = 1 << 0,
+  IS_REDECODE                    = 1 << 1,
+  IMAGE_IS_TRANSIENT             = 1 << 2,
+  ASYNC_NOTIFY                   = 1 << 3
+};
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(DecoderFlags)
+
+/**
+ * @return the default set of decode flags.
+ */
+inline DecoderFlags
+DefaultDecoderFlags()
+{
+  return DecoderFlags();
+}
+
+} // namespace image
+} // namespace mozilla
+
+#endif // mozilla_image_DecoderFlags_h