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       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2             :  * This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #ifndef GFX_DIRECTIONUTILS_H
       7             : #define GFX_DIRECTIONUTILS_H
       8             : 
       9             : #include "LayersTypes.h"  // for ScrollDirection
      10             : #include "Units.h"        // for Coord, Point, and Rect types
      11             : 
      12             : namespace mozilla {
      13             : namespace layers {
      14             : 
      15             : template <typename PointOrRect>
      16           0 : CoordOf<PointOrRect> GetAxisStart(ScrollDirection aDir, const PointOrRect& aValue) {
      17           0 :   if (aDir == ScrollDirection::HORIZONTAL) {
      18           0 :     return aValue.x;
      19             :   } else {
      20           0 :     return aValue.y;
      21             :   }
      22             : }
      23             : 
      24             : template <typename Rect>
      25             : CoordOf<Rect> GetAxisEnd(ScrollDirection aDir, const Rect& aValue) {
      26             :   if (aDir == ScrollDirection::HORIZONTAL) {
      27             :     return aValue.x + aValue.width;
      28             :   } else {
      29             :     return aValue.y + aValue.height;
      30             :   }
      31             : }
      32             : 
      33             : template <typename Rect>
      34           0 : CoordOf<Rect> GetAxisLength(ScrollDirection aDir, const Rect& aValue) {
      35           0 :   if (aDir == ScrollDirection::HORIZONTAL) {
      36           0 :     return aValue.width;
      37             :   } else {
      38           0 :     return aValue.height;
      39             :   }
      40             : }
      41             : 
      42             : template <typename FromUnits, typename ToUnits>
      43             : float GetAxisScale(ScrollDirection aDir, const gfx::ScaleFactors2D<FromUnits, ToUnits>& aValue) {
      44             :   if (aDir == ScrollDirection::HORIZONTAL) {
      45             :     return aValue.xScale;
      46             :   } else {
      47             :     return aValue.yScale;
      48             :   }
      49             : }
      50             : 
      51           0 : inline ScrollDirection GetPerpendicularDirection(ScrollDirection aDir) {
      52             :   return aDir == ScrollDirection::HORIZONTAL
      53           0 :        ? ScrollDirection::VERTICAL
      54           0 :        : ScrollDirection::HORIZONTAL;
      55             : }
      56             : 
      57             : } // namespace layers
      58             : } // namespace mozilla
      59             : 
      60             : #endif /* GFX_DIRECTIONUTILS_H */