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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 GFX_DIRECTIONUTILS_H
#define GFX_DIRECTIONUTILS_H
#include "LayersTypes.h" // for ScrollDirection
#include "Units.h" // for Coord, Point, and Rect types
namespace mozilla {
namespace layers {
template <typename PointOrRect>
CoordOf<PointOrRect> GetAxisStart(ScrollDirection aDir,
const PointOrRect& aValue) {
if (aDir == ScrollDirection::eHorizontal) {
return aValue.X();
} else {
return aValue.Y();
}
}
template <typename Rect>
CoordOf<Rect> GetAxisEnd(ScrollDirection aDir, const Rect& aValue) {
if (aDir == ScrollDirection::eHorizontal) {
return aValue.XMost();
} else {
return aValue.YMost();
}
}
template <typename Rect>
CoordOf<Rect> GetAxisLength(ScrollDirection aDir, const Rect& aValue) {
if (aDir == ScrollDirection::eHorizontal) {
return aValue.Width();
} else {
return aValue.Height();
}
}
template <typename FromUnits, typename ToUnits>
float GetAxisScale(ScrollDirection aDir,
const gfx::ScaleFactors2D<FromUnits, ToUnits>& aValue) {
if (aDir == ScrollDirection::eHorizontal) {
return aValue.xScale;
} else {
return aValue.yScale;
}
}
inline ScrollDirection GetPerpendicularDirection(ScrollDirection aDir) {
return aDir == ScrollDirection::eHorizontal ? ScrollDirection::eVertical
: ScrollDirection::eHorizontal;
}
} // namespace layers
} // namespace mozilla
#endif /* GFX_DIRECTIONUTILS_H */
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