michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef MOZILLA_IMAGELIB_ORIENTATION_H_
michael@0: #define MOZILLA_IMAGELIB_ORIENTATION_H_
michael@0: 
michael@0: #include <stdint.h>
michael@0: #include "mozilla/TypedEnum.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace image {
michael@0: 
michael@0: MOZ_BEGIN_ENUM_CLASS(Angle, uint8_t)
michael@0:   D0,
michael@0:   D90,
michael@0:   D180,
michael@0:   D270
michael@0: MOZ_END_ENUM_CLASS(Angle)
michael@0: 
michael@0: MOZ_BEGIN_ENUM_CLASS(Flip, uint8_t)
michael@0:   Unflipped,
michael@0:   Horizontal
michael@0: MOZ_END_ENUM_CLASS(Flip)
michael@0: 
michael@0: /**
michael@0:  * A struct that describes an image's orientation as a rotation optionally
michael@0:  * followed by a reflection. This may be used to be indicate an image's inherent
michael@0:  * orientation or a desired orientation for the image.
michael@0:  */
michael@0: struct Orientation
michael@0: {
michael@0:   Orientation(Angle aRotation = Angle::D0, Flip mFlip = Flip::Unflipped)
michael@0:     : rotation(aRotation)
michael@0:     , flip(mFlip)
michael@0:   { }
michael@0: 
michael@0:   bool IsIdentity() const {
michael@0:     return (rotation == Angle::D0) && (flip == Flip::Unflipped);
michael@0:   }
michael@0: 
michael@0:   bool SwapsWidthAndHeight() const {
michael@0:     return (rotation == Angle::D90) || (rotation == Angle::D270);
michael@0:   }
michael@0: 
michael@0:   bool operator==(const Orientation& aOther) const {
michael@0:     return (rotation == aOther.rotation) && (flip == aOther.flip);
michael@0:   }
michael@0: 
michael@0:   bool operator!=(const Orientation& aOther) const {
michael@0:     return !(*this == aOther);
michael@0:   }
michael@0: 
michael@0:   Angle rotation;
michael@0:   Flip  flip;
michael@0: };
michael@0: 
michael@0: }
michael@0: }
michael@0: 
michael@0: #endif