1 files changed, 62 insertions, 0 deletions
diff --git a/image/Orientation.h b/image/Orientation.h
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--- /dev/null
+++ b/image/Orientation.h
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+/* -*- 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_Orientation_h
+#define mozilla_image_Orientation_h
+
+#include <stdint.h>
+
+namespace mozilla {
+namespace image {
+
+enum class Angle : uint8_t {
+  D0,
+  D90,
+  D180,
+  D270
+};
+
+enum class Flip : uint8_t {
+  Unflipped,
+  Horizontal
+};
+
+/**
+ * A struct that describes an image's orientation as a rotation optionally
+ * followed by a reflection. This may be used to be indicate an image's inherent
+ * orientation or a desired orientation for the image.
+ */
+struct Orientation
+{
+  explicit Orientation(Angle aRotation = Angle::D0,
+                       Flip mFlip = Flip::Unflipped)
+    : rotation(aRotation)
+    , flip(mFlip)
+  { }
+
+  bool IsIdentity() const {
+    return (rotation == Angle::D0) && (flip == Flip::Unflipped);
+  }
+
+  bool SwapsWidthAndHeight() const {
+    return (rotation == Angle::D90) || (rotation == Angle::D270);
+  }
+
+  bool operator==(const Orientation& aOther) const {
+    return (rotation == aOther.rotation) && (flip == aOther.flip);
+  }
+
+  bool operator!=(const Orientation& aOther) const {
+    return !(*this == aOther);
+  }
+
+  Angle rotation;
+  Flip  flip;
+};
+
+} // namespace image
+} // namespace mozilla
+
+#endif // mozilla_image_Orientation_h