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