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112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_image_Orientation_h
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#define mozilla_image_Orientation_h
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#include <stdint.h>
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#include "mozilla/gfx/Rect.h"
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namespace mozilla {
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// Pixel values in an image considering orientation metadata, such as the size
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// of an image as seen by consumers of the image.
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//
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// Any public methods on RasterImage that use untyped units are interpreted as
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// oriented pixels.
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struct OrientedPixel {};
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template <>
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struct IsPixel<OrientedPixel> : std::true_type {};
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typedef gfx::IntPointTyped<OrientedPixel> OrientedIntPoint;
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typedef gfx::IntSizeTyped<OrientedPixel> OrientedIntSize;
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typedef gfx::IntRectTyped<OrientedPixel> OrientedIntRect;
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// Pixel values in an image ignoring orientation metadata, such as are stored
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// in surfaces and the raw pixel data in the image.
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struct UnorientedPixel {};
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template <>
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struct IsPixel<UnorientedPixel> : std::true_type {};
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typedef gfx::IntPointTyped<UnorientedPixel> UnorientedIntPoint;
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typedef gfx::IntSizeTyped<UnorientedPixel> UnorientedIntSize;
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typedef gfx::IntRectTyped<UnorientedPixel> UnorientedIntRect;
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namespace image {
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enum class Angle : uint8_t { D0, D90, D180, D270 };
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enum class Flip : uint8_t { Unflipped, Horizontal };
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/**
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* A struct that describes an image's orientation as a rotation optionally
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* followed by a reflection. This may be used to be indicate an image's inherent
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* orientation or a desired orientation for the image.
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*
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* When flipFirst = true, this indicates that the reflection is applied before
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* the rotation. (This is used by OrientedImage to represent the inverse of an
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* underlying image's Orientation.)
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*/
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struct Orientation {
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explicit Orientation(Angle aRotation = Angle::D0,
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Flip aFlip = Flip::Unflipped, bool aFlipFirst = false)
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: rotation(aRotation), flip(aFlip), flipFirst(aFlipFirst) {}
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Orientation Reversed() const {
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return Orientation(InvertAngle(rotation), flip, !flipFirst);
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}
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bool IsIdentity() const {
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return (rotation == Angle::D0) && (flip == Flip::Unflipped);
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}
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bool SwapsWidthAndHeight() const {
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return (rotation == Angle::D90) || (rotation == Angle::D270);
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}
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bool operator==(const Orientation& aOther) const {
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return rotation == aOther.rotation && flip == aOther.flip &&
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flipFirst == aOther.flipFirst;
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}
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bool operator!=(const Orientation& aOther) const {
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return !(*this == aOther);
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}
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OrientedIntSize ToOriented(const UnorientedIntSize& aSize) const {
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if (SwapsWidthAndHeight()) {
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return OrientedIntSize(aSize.height, aSize.width);
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} else {
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return OrientedIntSize(aSize.width, aSize.height);
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}
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}
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UnorientedIntSize ToUnoriented(const OrientedIntSize& aSize) const {
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if (SwapsWidthAndHeight()) {
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return UnorientedIntSize(aSize.height, aSize.width);
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} else {
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return UnorientedIntSize(aSize.width, aSize.height);
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}
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}
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static Angle InvertAngle(Angle aAngle) {
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switch (aAngle) {
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case Angle::D90:
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return Angle::D270;
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case Angle::D270:
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return Angle::D90;
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default:
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return aAngle;
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}
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}
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Angle rotation;
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Flip flip;
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bool flipFirst;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_Orientation_h
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