/* -*- 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 MOZ_UNITS_H_

#define MOZ_UNITS_H_

#include "mozilla/gfx/Coord.h"

#include "mozilla/gfx/Point.h"

#include "mozilla/gfx/Rect.h"

#include "mozilla/gfx/RectAbsolute.h"

#include "mozilla/gfx/ScaleFactor.h"

#include "mozilla/gfx/ScaleFactors2D.h"

#include "nsMargin.h"

#include "nsRect.h"

#include "nsRegion.h"

#include "mozilla/AppUnits.h"

#include "mozilla/TypeTraits.h"

namespace mozilla {

template <typename T>

struct IsPixel : FalseType {};

// See struct declaration for a description of each unit type.

struct CSSPixel;

struct LayoutDevicePixel;

struct LayerPixel;

struct CSSTransformedLayerPixel;

struct RenderTargetPixel;

struct ScreenPixel;

struct ParentLayerPixel;

struct DesktopPixel;

struct ImagePixel;

template<> struct IsPixel<CSSPixel>          : TrueType {};

template<> struct IsPixel<LayoutDevicePixel> : TrueType {};

template<> struct IsPixel<LayerPixel>        : TrueType {};

template<> struct IsPixel<CSSTransformedLayerPixel> : TrueType {};

template<> struct IsPixel<RenderTargetPixel> : TrueType {};

template<> struct IsPixel<ImagePixel> : TrueType {};

template<> struct IsPixel<ScreenPixel>       : TrueType {};

template<> struct IsPixel<ParentLayerPixel>  : TrueType {};

template<> struct IsPixel<DesktopPixel>      : TrueType {};

typedef gfx::CoordTyped<CSSPixel> CSSCoord;

typedef gfx::IntCoordTyped<CSSPixel> CSSIntCoord;

typedef gfx::PointTyped<CSSPixel> CSSPoint;

typedef gfx::IntPointTyped<CSSPixel> CSSIntPoint;

typedef gfx::SizeTyped<CSSPixel> CSSSize;

typedef gfx::IntSizeTyped<CSSPixel> CSSIntSize;

typedef gfx::RectTyped<CSSPixel> CSSRect;

typedef gfx::IntRectTyped<CSSPixel> CSSIntRect;

typedef gfx::MarginTyped<CSSPixel> CSSMargin;

typedef gfx::IntMarginTyped<CSSPixel> CSSIntMargin;

typedef gfx::IntRegionTyped<CSSPixel> CSSIntRegion;

typedef gfx::CoordTyped<LayoutDevicePixel> LayoutDeviceCoord;

typedef gfx::IntCoordTyped<LayoutDevicePixel> LayoutDeviceIntCoord;

typedef gfx::PointTyped<LayoutDevicePixel> LayoutDevicePoint;

typedef gfx::IntPointTyped<LayoutDevicePixel> LayoutDeviceIntPoint;

typedef gfx::SizeTyped<LayoutDevicePixel> LayoutDeviceSize;

typedef gfx::IntSizeTyped<LayoutDevicePixel> LayoutDeviceIntSize;

typedef gfx::RectTyped<LayoutDevicePixel> LayoutDeviceRect;

typedef gfx::IntRectTyped<LayoutDevicePixel> LayoutDeviceIntRect;

typedef gfx::MarginTyped<LayoutDevicePixel> LayoutDeviceMargin;

typedef gfx::IntMarginTyped<LayoutDevicePixel> LayoutDeviceIntMargin;

typedef gfx::IntRegionTyped<LayoutDevicePixel> LayoutDeviceIntRegion;

typedef gfx::CoordTyped<LayerPixel> LayerCoord;

typedef gfx::IntCoordTyped<LayerPixel> LayerIntCoord;

typedef gfx::PointTyped<LayerPixel> LayerPoint;

typedef gfx::IntPointTyped<LayerPixel> LayerIntPoint;

typedef gfx::SizeTyped<LayerPixel> LayerSize;

typedef gfx::IntSizeTyped<LayerPixel> LayerIntSize;

typedef gfx::RectTyped<LayerPixel> LayerRect;

typedef gfx::RectAbsoluteTyped<LayerPixel> LayerRectAbsolute;

typedef gfx::IntRectTyped<LayerPixel> LayerIntRect;

typedef gfx::MarginTyped<LayerPixel> LayerMargin;

typedef gfx::IntMarginTyped<LayerPixel> LayerIntMargin;

typedef gfx::IntRegionTyped<LayerPixel> LayerIntRegion;

typedef gfx::CoordTyped<CSSTransformedLayerPixel> CSSTransformedLayerCoord;

typedef gfx::IntCoordTyped<CSSTransformedLayerPixel> CSSTransformedLayerIntCoord;

typedef gfx::PointTyped<CSSTransformedLayerPixel> CSSTransformedLayerPoint;

typedef gfx::IntPointTyped<CSSTransformedLayerPixel> CSSTransformedLayerIntPoint;

typedef gfx::SizeTyped<CSSTransformedLayerPixel> CSSTransformedLayerSize;

typedef gfx::IntSizeTyped<CSSTransformedLayerPixel> CSSTransformedLayerIntSize;

typedef gfx::RectTyped<CSSTransformedLayerPixel> CSSTransformedLayerRect;

typedef gfx::IntRectTyped<CSSTransformedLayerPixel> CSSTransformedLayerIntRect;

typedef gfx::MarginTyped<CSSTransformedLayerPixel> CSSTransformedLayerMargin;

typedef gfx::IntMarginTyped<CSSTransformedLayerPixel> CSSTransformedLayerIntMargin;

typedef gfx::IntRegionTyped<CSSTransformedLayerPixel> CSSTransformedLayerIntRegion;

typedef gfx::PointTyped<RenderTargetPixel> RenderTargetPoint;

typedef gfx::IntPointTyped<RenderTargetPixel> RenderTargetIntPoint;

typedef gfx::SizeTyped<RenderTargetPixel> RenderTargetSize;

typedef gfx::IntSizeTyped<RenderTargetPixel> RenderTargetIntSize;

typedef gfx::RectTyped<RenderTargetPixel> RenderTargetRect;

typedef gfx::IntRectTyped<RenderTargetPixel> RenderTargetIntRect;

typedef gfx::MarginTyped<RenderTargetPixel> RenderTargetMargin;

typedef gfx::IntMarginTyped<RenderTargetPixel> RenderTargetIntMargin;

typedef gfx::IntRegionTyped<RenderTargetPixel> RenderTargetIntRegion;

typedef gfx::IntRectTyped<ImagePixel> ImageIntRect;

typedef gfx::CoordTyped<ScreenPixel> ScreenCoord;

typedef gfx::IntCoordTyped<ScreenPixel> ScreenIntCoord;

typedef gfx::PointTyped<ScreenPixel> ScreenPoint;

typedef gfx::IntPointTyped<ScreenPixel> ScreenIntPoint;

typedef gfx::SizeTyped<ScreenPixel> ScreenSize;

typedef gfx::IntSizeTyped<ScreenPixel> ScreenIntSize;

typedef gfx::RectTyped<ScreenPixel> ScreenRect;

typedef gfx::IntRectTyped<ScreenPixel> ScreenIntRect;

typedef gfx::MarginTyped<ScreenPixel> ScreenMargin;

typedef gfx::IntMarginTyped<ScreenPixel> ScreenIntMargin;

typedef gfx::IntRegionTyped<ScreenPixel> ScreenIntRegion;

typedef gfx::CoordTyped<ParentLayerPixel> ParentLayerCoord;

typedef gfx::IntCoordTyped<ParentLayerPixel> ParentLayerIntCoord;

typedef gfx::PointTyped<ParentLayerPixel> ParentLayerPoint;

typedef gfx::IntPointTyped<ParentLayerPixel> ParentLayerIntPoint;

typedef gfx::SizeTyped<ParentLayerPixel> ParentLayerSize;

typedef gfx::IntSizeTyped<ParentLayerPixel> ParentLayerIntSize;

typedef gfx::RectTyped<ParentLayerPixel> ParentLayerRect;

typedef gfx::IntRectTyped<ParentLayerPixel> ParentLayerIntRect;

typedef gfx::MarginTyped<ParentLayerPixel> ParentLayerMargin;

typedef gfx::IntMarginTyped<ParentLayerPixel> ParentLayerIntMargin;

typedef gfx::IntRegionTyped<ParentLayerPixel> ParentLayerIntRegion;

typedef gfx::CoordTyped<DesktopPixel> DesktopCoord;

typedef gfx::IntCoordTyped<DesktopPixel> DesktopIntCoord;

typedef gfx::PointTyped<DesktopPixel> DesktopPoint;

typedef gfx::IntPointTyped<DesktopPixel> DesktopIntPoint;

typedef gfx::SizeTyped<DesktopPixel> DesktopSize;

typedef gfx::IntSizeTyped<DesktopPixel> DesktopIntSize;

typedef gfx::RectTyped<DesktopPixel> DesktopRect;

typedef gfx::IntRectTyped<DesktopPixel> DesktopIntRect;

typedef gfx::ScaleFactor<CSSPixel, CSSPixel> CSSToCSSScale;

typedef gfx::ScaleFactor<CSSPixel, LayoutDevicePixel> CSSToLayoutDeviceScale;

typedef gfx::ScaleFactor<CSSPixel, LayerPixel> CSSToLayerScale;

typedef gfx::ScaleFactor<CSSPixel, ScreenPixel> CSSToScreenScale;

typedef gfx::ScaleFactor<CSSPixel, ParentLayerPixel> CSSToParentLayerScale;

typedef gfx::ScaleFactor<LayoutDevicePixel, CSSPixel> LayoutDeviceToCSSScale;

typedef gfx::ScaleFactor<LayoutDevicePixel, LayerPixel> LayoutDeviceToLayerScale;

typedef gfx::ScaleFactor<LayoutDevicePixel, ScreenPixel> LayoutDeviceToScreenScale;

typedef gfx::ScaleFactor<LayoutDevicePixel, ParentLayerPixel> LayoutDeviceToParentLayerScale;

typedef gfx::ScaleFactor<LayerPixel, CSSPixel> LayerToCSSScale;

typedef gfx::ScaleFactor<LayerPixel, LayoutDevicePixel> LayerToLayoutDeviceScale;

typedef gfx::ScaleFactor<LayerPixel, RenderTargetPixel> LayerToRenderTargetScale;

typedef gfx::ScaleFactor<LayerPixel, ScreenPixel> LayerToScreenScale;

typedef gfx::ScaleFactor<LayerPixel, ParentLayerPixel> LayerToParentLayerScale;

typedef gfx::ScaleFactor<RenderTargetPixel, ScreenPixel> RenderTargetToScreenScale;

typedef gfx::ScaleFactor<ScreenPixel, CSSPixel> ScreenToCSSScale;

typedef gfx::ScaleFactor<ScreenPixel, LayoutDevicePixel> ScreenToLayoutDeviceScale;

typedef gfx::ScaleFactor<ScreenPixel, LayerPixel> ScreenToLayerScale;

typedef gfx::ScaleFactor<ScreenPixel, ParentLayerPixel> ScreenToParentLayerScale;

typedef gfx::ScaleFactor<ParentLayerPixel, LayerPixel> ParentLayerToLayerScale;

typedef gfx::ScaleFactor<ParentLayerPixel, ScreenPixel> ParentLayerToScreenScale;

typedef gfx::ScaleFactor<ParentLayerPixel, ParentLayerPixel> ParentLayerToParentLayerScale;

typedef gfx::ScaleFactor<DesktopPixel, LayoutDevicePixel> DesktopToLayoutDeviceScale;

typedef gfx::ScaleFactors2D<CSSPixel, LayoutDevicePixel> CSSToLayoutDeviceScale2D;

typedef gfx::ScaleFactors2D<CSSPixel, LayerPixel> CSSToLayerScale2D;

typedef gfx::ScaleFactors2D<CSSPixel, ScreenPixel> CSSToScreenScale2D;

typedef gfx::ScaleFactors2D<CSSPixel, ParentLayerPixel> CSSToParentLayerScale2D;

typedef gfx::ScaleFactors2D<LayoutDevicePixel, CSSPixel> LayoutDeviceToCSSScale2D;

typedef gfx::ScaleFactors2D<LayoutDevicePixel, LayerPixel> LayoutDeviceToLayerScale2D;

typedef gfx::ScaleFactors2D<LayoutDevicePixel, ScreenPixel> LayoutDeviceToScreenScale2D;

typedef gfx::ScaleFactors2D<LayoutDevicePixel, ParentLayerPixel> LayoutDeviceToParentLayerScale2D;

typedef gfx::ScaleFactors2D<LayerPixel, CSSPixel> LayerToCSSScale2D;

typedef gfx::ScaleFactors2D<LayerPixel, LayoutDevicePixel> LayerToLayoutDeviceScale2D;

typedef gfx::ScaleFactors2D<LayerPixel, RenderTargetPixel> LayerToRenderTargetScale2D;

typedef gfx::ScaleFactors2D<LayerPixel, ScreenPixel> LayerToScreenScale2D;

typedef gfx::ScaleFactors2D<LayerPixel, ParentLayerPixel> LayerToParentLayerScale2D;

typedef gfx::ScaleFactors2D<RenderTargetPixel, ScreenPixel> RenderTargetToScreenScale2D;

typedef gfx::ScaleFactors2D<ScreenPixel, CSSPixel> ScreenToCSSScale2D;

typedef gfx::ScaleFactors2D<ScreenPixel, LayoutDevicePixel> ScreenToLayoutDeviceScale2D;

typedef gfx::ScaleFactors2D<ScreenPixel, LayerPixel> ScreenToLayerScale2D;

typedef gfx::ScaleFactors2D<ScreenPixel, ParentLayerPixel> ScreenToParentLayerScale2D;

typedef gfx::ScaleFactors2D<ParentLayerPixel, LayerPixel> ParentLayerToLayerScale2D;

typedef gfx::ScaleFactors2D<ParentLayerPixel, ScreenPixel> ParentLayerToScreenScale2D;

typedef gfx::ScaleFactors2D<ParentLayerPixel, ParentLayerPixel> ParentLayerToParentLayerScale2D;

typedef gfx::Matrix4x4Typed<LayoutDevicePixel, LayoutDevicePixel> LayoutDeviceToLayoutDeviceMatrix4x4;

typedef gfx::Matrix4x4Typed<LayerPixel, ParentLayerPixel> LayerToParentLayerMatrix4x4;

typedef gfx::Matrix4x4Typed<ScreenPixel, ScreenPixel> ScreenToScreenMatrix4x4;

typedef gfx::Matrix4x4Typed<ScreenPixel, ParentLayerPixel> ScreenToParentLayerMatrix4x4;

typedef gfx::Matrix4x4Typed<ParentLayerPixel, LayerPixel> ParentLayerToLayerMatrix4x4;

typedef gfx::Matrix4x4Typed<ParentLayerPixel, ScreenPixel> ParentLayerToScreenMatrix4x4;

typedef gfx::Matrix4x4Typed<ParentLayerPixel, ParentLayerPixel> ParentLayerToParentLayerMatrix4x4;

typedef gfx::Matrix4x4Typed<ParentLayerPixel, RenderTargetPixel> ParentLayerToRenderTargetMatrix4x4;

/*

 * The pixels that content authors use to specify sizes in.

 */

struct CSSPixel {

  // Conversions from app units

  static CSSCoord FromAppUnits(nscoord aCoord) {

    return NSAppUnitsToFloatPixels(aCoord, float(AppUnitsPerCSSPixel()));

  }

  static CSSPoint FromAppUnits(const nsPoint& aPoint) {

    return CSSPoint(NSAppUnitsToFloatPixels(aPoint.x, float(AppUnitsPerCSSPixel())),

                    NSAppUnitsToFloatPixels(aPoint.y, float(AppUnitsPerCSSPixel())));

  }

  static CSSSize FromAppUnits(const nsSize& aSize) {

    return CSSSize(NSAppUnitsToFloatPixels(aSize.width, float(AppUnitsPerCSSPixel())),

                   NSAppUnitsToFloatPixels(aSize.height, float(AppUnitsPerCSSPixel())));

  }

  static CSSRect FromAppUnits(const nsRect& aRect) {

    return CSSRect(NSAppUnitsToFloatPixels(aRect.x, float(AppUnitsPerCSSPixel())),

                   NSAppUnitsToFloatPixels(aRect.y, float(AppUnitsPerCSSPixel())),

                   NSAppUnitsToFloatPixels(aRect.Width(), float(AppUnitsPerCSSPixel())),

                   NSAppUnitsToFloatPixels(aRect.Height(), float(AppUnitsPerCSSPixel())));

  }

  static CSSMargin FromAppUnits(const nsMargin& aMargin) {

    return CSSMargin(NSAppUnitsToFloatPixels(aMargin.top, float(AppUnitsPerCSSPixel())),

                     NSAppUnitsToFloatPixels(aMargin.right, float(AppUnitsPerCSSPixel())),

                     NSAppUnitsToFloatPixels(aMargin.bottom, float(AppUnitsPerCSSPixel())),

                     NSAppUnitsToFloatPixels(aMargin.left, float(AppUnitsPerCSSPixel())));

  }

  static CSSIntPoint FromAppUnitsRounded(const nsPoint& aPoint) {

    return CSSIntPoint(NSAppUnitsToIntPixels(aPoint.x, float(AppUnitsPerCSSPixel())),

                       NSAppUnitsToIntPixels(aPoint.y, float(AppUnitsPerCSSPixel())));

  }

  static CSSIntSize FromAppUnitsRounded(const nsSize& aSize)

  {

    return CSSIntSize(NSAppUnitsToIntPixels(aSize.width, float(AppUnitsPerCSSPixel())),

                      NSAppUnitsToIntPixels(aSize.height, float(AppUnitsPerCSSPixel())));

  }

  static CSSIntRect FromAppUnitsRounded(const nsRect& aRect) {

    return CSSIntRect(NSAppUnitsToIntPixels(aRect.x, float(AppUnitsPerCSSPixel())),

                      NSAppUnitsToIntPixels(aRect.y, float(AppUnitsPerCSSPixel())),

                      NSAppUnitsToIntPixels(aRect.Width(), float(AppUnitsPerCSSPixel())),

                      NSAppUnitsToIntPixels(aRect.Height(), float(AppUnitsPerCSSPixel())));

  }

  static CSSIntRect FromAppUnitsToNearest(const nsRect& aRect) {

    return CSSIntRect::FromUnknownRect(aRect.ToNearestPixels(AppUnitsPerCSSPixel()));

  }

  // Conversions to app units

  static nscoord ToAppUnits(CSSCoord aCoord) {

    return NSToCoordRoundWithClamp(aCoord * float(AppUnitsPerCSSPixel()));

  }

  static nsPoint ToAppUnits(const CSSPoint& aPoint) {

    return nsPoint(NSToCoordRoundWithClamp(aPoint.x * float(AppUnitsPerCSSPixel())),

                   NSToCoordRoundWithClamp(aPoint.y * float(AppUnitsPerCSSPixel())));

  }

  static nsPoint ToAppUnits(const CSSIntPoint& aPoint) {

    return nsPoint(NSToCoordRoundWithClamp(float(aPoint.x) * float(AppUnitsPerCSSPixel())),

                   NSToCoordRoundWithClamp(float(aPoint.y) * float(AppUnitsPerCSSPixel())));

  }

  static nsSize ToAppUnits(const CSSSize& aSize) {

    return nsSize(NSToCoordRoundWithClamp(aSize.width * float(AppUnitsPerCSSPixel())),

                  NSToCoordRoundWithClamp(aSize.height * float(AppUnitsPerCSSPixel())));

  }

  static nsSize ToAppUnits(const CSSIntSize& aSize) {

    return nsSize(NSToCoordRoundWithClamp(float(aSize.width)  * float(AppUnitsPerCSSPixel())),

                  NSToCoordRoundWithClamp(float(aSize.height) * float(AppUnitsPerCSSPixel())));

  }

  static nsRect ToAppUnits(const CSSRect& aRect) {

    return nsRect(NSToCoordRoundWithClamp(aRect.x * float(AppUnitsPerCSSPixel())),

                  NSToCoordRoundWithClamp(aRect.y * float(AppUnitsPerCSSPixel())),

                  NSToCoordRoundWithClamp(aRect.Width() * float(AppUnitsPerCSSPixel())),

                  NSToCoordRoundWithClamp(aRect.Height() * float(AppUnitsPerCSSPixel())));

  }

  static nsRect ToAppUnits(const CSSIntRect& aRect) {

    return nsRect(NSToCoordRoundWithClamp(float(aRect.x) * float(AppUnitsPerCSSPixel())),

                  NSToCoordRoundWithClamp(float(aRect.y) * float(AppUnitsPerCSSPixel())),

                  NSToCoordRoundWithClamp(float(aRect.Width()) * float(AppUnitsPerCSSPixel())),

                  NSToCoordRoundWithClamp(float(aRect.Height()) * float(AppUnitsPerCSSPixel())));

  }

};

/*

 * The pixels that are referred to as "device pixels" in layout code. In

 * general values measured in LayoutDevicePixels are obtained by dividing a

 * value in app units by AppUnitsPerDevPixel(). Conversion between CSS pixels

 * and LayoutDevicePixels is affected by:

 * 1) the "full zoom" (see nsPresContext::SetFullZoom)

 * 2) the "widget scale" (see nsIWidget::GetDefaultScale)

 */

struct LayoutDevicePixel {

  static LayoutDeviceRect FromAppUnits(const nsRect& aRect, nscoord aAppUnitsPerDevPixel) {

    return LayoutDeviceRect(NSAppUnitsToFloatPixels(aRect.x, float(aAppUnitsPerDevPixel)),

                            NSAppUnitsToFloatPixels(aRect.y, float(aAppUnitsPerDevPixel)),

                            NSAppUnitsToFloatPixels(aRect.Width(), float(aAppUnitsPerDevPixel)),

                            NSAppUnitsToFloatPixels(aRect.Height(), float(aAppUnitsPerDevPixel)));

  }

  static LayoutDeviceSize FromAppUnits(const nsSize& aSize, nscoord aAppUnitsPerDevPixel) {

    return LayoutDeviceSize(

      NSAppUnitsToFloatPixels(aSize.width, aAppUnitsPerDevPixel),

      NSAppUnitsToFloatPixels(aSize.height, aAppUnitsPerDevPixel));

  }

  static LayoutDevicePoint FromAppUnits(const nsPoint& aPoint, nscoord aAppUnitsPerDevPixel) {

    return LayoutDevicePoint(NSAppUnitsToFloatPixels(aPoint.x, aAppUnitsPerDevPixel),

                             NSAppUnitsToFloatPixels(aPoint.y, aAppUnitsPerDevPixel));

  }

  static LayoutDeviceMargin FromAppUnits(const nsMargin& aMargin, nscoord aAppUnitsPerDevPixel) {

    return LayoutDeviceMargin(NSAppUnitsToFloatPixels(aMargin.top, aAppUnitsPerDevPixel),

                              NSAppUnitsToFloatPixels(aMargin.right, aAppUnitsPerDevPixel),

                              NSAppUnitsToFloatPixels(aMargin.bottom, aAppUnitsPerDevPixel),

                              NSAppUnitsToFloatPixels(aMargin.left, aAppUnitsPerDevPixel));

  }

  static LayoutDeviceIntPoint FromAppUnitsRounded(const nsPoint& aPoint, nscoord aAppUnitsPerDevPixel) {

    return LayoutDeviceIntPoint(NSAppUnitsToIntPixels(aPoint.x, aAppUnitsPerDevPixel),

                                NSAppUnitsToIntPixels(aPoint.y, aAppUnitsPerDevPixel));

  }

  static LayoutDeviceIntPoint FromAppUnitsToNearest(const nsPoint& aPoint, nscoord aAppUnitsPerDevPixel) {

    return LayoutDeviceIntPoint::FromUnknownPoint(aPoint.ToNearestPixels(aAppUnitsPerDevPixel));

  }

  static LayoutDeviceIntRect FromAppUnitsToNearest(const nsRect& aRect, nscoord aAppUnitsPerDevPixel) {

    return LayoutDeviceIntRect::FromUnknownRect(aRect.ToNearestPixels(aAppUnitsPerDevPixel));

  }

  static LayoutDeviceIntRect FromAppUnitsToInside(const nsRect& aRect, nscoord aAppUnitsPerDevPixel) {

    return LayoutDeviceIntRect::FromUnknownRect(aRect.ToInsidePixels(aAppUnitsPerDevPixel));

  }

  static LayoutDeviceIntRect FromAppUnitsToOutside(const nsRect& aRect, nscoord aAppUnitsPerDevPixel) {

    return LayoutDeviceIntRect::FromUnknownRect(aRect.ToOutsidePixels(aAppUnitsPerDevPixel));

  }

  static LayoutDeviceIntSize FromAppUnitsRounded(const nsSize& aSize, nscoord aAppUnitsPerDevPixel) {

    return LayoutDeviceIntSize(

      NSAppUnitsToIntPixels(aSize.width, aAppUnitsPerDevPixel),

      NSAppUnitsToIntPixels(aSize.height, aAppUnitsPerDevPixel));

  }

  static nsPoint ToAppUnits(const LayoutDeviceIntPoint& aPoint, nscoord aAppUnitsPerDevPixel) {

    return nsPoint(aPoint.x * aAppUnitsPerDevPixel,

                   aPoint.y * aAppUnitsPerDevPixel);

  }

  static nsSize ToAppUnits(const LayoutDeviceIntSize& aSize, nscoord aAppUnitsPerDevPixel) {

    return nsSize(aSize.width * aAppUnitsPerDevPixel,

                  aSize.height * aAppUnitsPerDevPixel);

  }

  static nsSize ToAppUnits(const LayoutDeviceSize& aSize, nscoord aAppUnitsPerDevPixel) {

    return nsSize(NSFloatPixelsToAppUnits(aSize.width, aAppUnitsPerDevPixel),

                  NSFloatPixelsToAppUnits(aSize.height, aAppUnitsPerDevPixel));

  }

  static nsRect ToAppUnits(const LayoutDeviceIntRect& aRect, nscoord aAppUnitsPerDevPixel) {

    return nsRect(aRect.x * aAppUnitsPerDevPixel,

                  aRect.y * aAppUnitsPerDevPixel,

                  aRect.Width() * aAppUnitsPerDevPixel,

                  aRect.Height() * aAppUnitsPerDevPixel);

  }

  static nsRect ToAppUnits(const LayoutDeviceRect& aRect, nscoord aAppUnitsPerDevPixel) {

    return nsRect(NSFloatPixelsToAppUnits(aRect.x, aAppUnitsPerDevPixel),

                  NSFloatPixelsToAppUnits(aRect.y, aAppUnitsPerDevPixel),

                  NSFloatPixelsToAppUnits(aRect.Width(), aAppUnitsPerDevPixel),

                  NSFloatPixelsToAppUnits(aRect.Height(), aAppUnitsPerDevPixel));

  }

  static nsMargin ToAppUnits(const LayoutDeviceIntMargin& aMargin, nscoord aAppUnitsPerDevPixel) {

    return nsMargin(aMargin.top * aAppUnitsPerDevPixel,

                    aMargin.right * aAppUnitsPerDevPixel,

                    aMargin.bottom * aAppUnitsPerDevPixel,

                    aMargin.left * aAppUnitsPerDevPixel);

  }

};

/*

 * The pixels that layout rasterizes and delivers to the graphics code.

 * These also are generally referred to as "device pixels" in layout code.

 * Conversion between CSS pixels and LayerPixels is affected by:

 * 1) the "display resolution" (see nsIPresShell::SetResolution)

 * 2) the "full zoom" (see nsPresContext::SetFullZoom)

 * 3) the "widget scale" (see nsIWidget::GetDefaultScale)

 * 4) rasterizing at a different scale in the presence of some CSS transforms

 */

struct LayerPixel {

};

/*

 * This is Layer coordinates with the Layer's CSS transform applied.

 * It can be thought of as intermediate between LayerPixel and

 * ParentLayerPixel, as further applying async transforms to this

 * yields ParentLayerPixels.

 */

struct CSSTransformedLayerPixel {

};

/*

 * Layers are always composited to a render target. This unit

 * represents one pixel in the render target. Note that for the

 * root render target RenderTargetPixel == ScreenPixel. Also

 * any ContainerLayer providing an intermediate surface will

 * have RenderTargetPixel == LayerPixel.

 */

struct RenderTargetPixel {

};

/*

 * This unit represents one pixel in an image. Image space

 * is largely independent of any other space.

 */

struct ImagePixel {

};

/*

 * The pixels that are displayed on the screen.

 * On non-OMTC platforms this should be equivalent to LayerPixel units.

 * On OMTC platforms these may diverge from LayerPixel units temporarily,

 * while an asynchronous zoom is happening, but should eventually converge

 * back to LayerPixel units. Some variables (such as those representing

 * chrome UI element sizes) that are not subject to content zoom should

 * generally be represented in ScreenPixel units.

 */

struct ScreenPixel {

};

/* The layer coordinates of the parent frame.

 * This can be arrived at in three ways:

 *   - Start with the CSS coordinates of the parent frame, multiply by the

 *     device scale and the cumulative resolution of the parent frame.

 *   - Start with the CSS coordinates of current frame, multiply by the device

 *     scale, the cumulative resolution of the current frame, and the scales

 *     from the CSS and async transforms of the current frame.

 *   - Start with global screen coordinates and unapply all CSS and async

 *     transforms from the root down to and including the parent.

 * It's helpful to look at https://wiki.mozilla.org/Platform/GFX/APZ#Coordinate_systems

 * to get a picture of how the various coordinate systems relate to each other.

 */

struct ParentLayerPixel {

};

/*

 * Pixels in the coordinate space used by the host OS to manage windows on the

 * desktop. What these mean varies between OSs:

 * - by default (unless implemented differently in platform-specific widget

 *   code) they are the same as LayoutDevicePixels

 * - on Mac OS X, they're "cocoa points", which correspond to device pixels

 *   on a non-Retina display, and to 2x device pixels on Retina

 * - on Windows *without* per-monitor DPI support, they are Windows "logical

 *   pixels", i.e. device pixels scaled according to the Windows display DPI

 *   scaling factor (typically one of 1.25, 1.5, 1.75, 2.0...)

 * - on Windows *with* per-monitor DPI support, they are physical device pixels

 *   on each screen; note that this means the scaling between CSS pixels and

 *   desktop pixels may vary across multiple displays.

 */

struct DesktopPixel {

};

// Operators to apply ScaleFactors directly to Coords, Points, Rects, Sizes and Margins

template<class src, class dst>

gfx::CoordTyped<dst> operator*(const gfx::CoordTyped<src>& aCoord, const gfx::ScaleFactor<src, dst>& aScale) {

  return gfx::CoordTyped<dst>(aCoord.value * aScale.scale);

}

template<class src, class dst>

gfx::CoordTyped<dst> operator/(const gfx::CoordTyped<src>& aCoord, const gfx::ScaleFactor<dst, src>& aScale) {

  return gfx::CoordTyped<dst>(aCoord.value / aScale.scale);

}

template<class src, class dst>

gfx::PointTyped<dst> operator*(const gfx::PointTyped<src>& aPoint, const gfx::ScaleFactor<src, dst>& aScale) {

  return gfx::PointTyped<dst>(aPoint.x * aScale.scale,

                              aPoint.y * aScale.scale);

}

template<class src, class dst>

gfx::PointTyped<dst> operator/(const gfx::PointTyped<src>& aPoint, const gfx::ScaleFactor<dst, src>& aScale) {

  return gfx::PointTyped<dst>(aPoint.x / aScale.scale,

                              aPoint.y / aScale.scale);

}

template<class src, class dst>

gfx::PointTyped<dst> operator*(const gfx::PointTyped<src>& aPoint, const gfx::ScaleFactors2D<src, dst>& aScale) {

  return gfx::PointTyped<dst>(aPoint.x * aScale.xScale,

                              aPoint.y * aScale.yScale);

}

template<class src, class dst>

gfx::PointTyped<dst> operator/(const gfx::PointTyped<src>& aPoint, const gfx::ScaleFactors2D<dst, src>& aScale) {

  return gfx::PointTyped<dst>(aPoint.x / aScale.xScale,

                              aPoint.y / aScale.yScale);

}

template<class src, class dst>

gfx::PointTyped<dst> operator*(const gfx::IntPointTyped<src>& aPoint, const gfx::ScaleFactor<src, dst>& aScale) {

  return gfx::PointTyped<dst>(float(aPoint.x) * aScale.scale,

                              float(aPoint.y) * aScale.scale);

}

template<class src, class dst>

gfx::PointTyped<dst> operator/(const gfx::IntPointTyped<src>& aPoint, const gfx::ScaleFactor<dst, src>& aScale) {

  return gfx::PointTyped<dst>(float(aPoint.x) / aScale.scale,

                              float(aPoint.y) / aScale.scale);

}

template<class src, class dst>

gfx::PointTyped<dst> operator*(const gfx::IntPointTyped<src>& aPoint, const gfx::ScaleFactors2D<src, dst>& aScale) {

  return gfx::PointTyped<dst>(float(aPoint.x) * aScale.xScale,

                              float(aPoint.y) * aScale.yScale);

}

template<class src, class dst>

gfx::PointTyped<dst> operator/(const gfx::IntPointTyped<src>& aPoint, const gfx::ScaleFactors2D<dst, src>& aScale) {

  return gfx::PointTyped<dst>(float(aPoint.x) / aScale.xScale,

                              float(aPoint.y) / aScale.yScale);

}

template<class src, class dst>

gfx::RectTyped<dst> operator*(const gfx::RectTyped<src>& aRect, const gfx::ScaleFactor<src, dst>& aScale) {

  return gfx::RectTyped<dst>(aRect.x * aScale.scale,

                             aRect.y * aScale.scale,

                             aRect.Width() * aScale.scale,

                             aRect.Height() * aScale.scale);

}

template<class src, class dst>

gfx::RectTyped<dst> operator/(const gfx::RectTyped<src>& aRect, const gfx::ScaleFactor<dst, src>& aScale) {

  return gfx::RectTyped<dst>(aRect.x / aScale.scale,

                             aRect.y / aScale.scale,

                             aRect.Width() / aScale.scale,

                             aRect.Height() / aScale.scale);

}

Unexecuted instantiation: mozilla::gfx::RectTyped<mozilla::LayerPixel, float> mozilla::operator/<mozilla::ParentLayerPixel, mozilla::LayerPixel>(mozilla::gfx::RectTyped<mozilla::ParentLayerPixel, float> const&, mozilla::gfx::ScaleFactor<mozilla::LayerPixel, mozilla::ParentLayerPixel> const&)

Unexecuted instantiation: mozilla::gfx::RectTyped<mozilla::DesktopPixel, float> mozilla::operator/<mozilla::LayoutDevicePixel, mozilla::DesktopPixel>(mozilla::gfx::RectTyped<mozilla::LayoutDevicePixel, float> const&, mozilla::gfx::ScaleFactor<mozilla::DesktopPixel, mozilla::LayoutDevicePixel> const&)

template<class src, class dst>

gfx::RectTyped<dst> operator*(const gfx::RectTyped<src>& aRect, const gfx::ScaleFactors2D<src, dst>& aScale) {

  return gfx::RectTyped<dst>(aRect.x * aScale.xScale,

                             aRect.y * aScale.yScale,

                             aRect.Width() * aScale.xScale,

                             aRect.Height() * aScale.yScale);

}

Unexecuted instantiation: mozilla::gfx::RectTyped<mozilla::LayerPixel, float> mozilla::operator*<mozilla::CSSPixel, mozilla::LayerPixel>(mozilla::gfx::RectTyped<mozilla::CSSPixel, float> const&, mozilla::gfx::ScaleFactors2D<mozilla::CSSPixel, mozilla::LayerPixel> const&)

Unexecuted instantiation: mozilla::gfx::RectTyped<mozilla::ScreenPixel, float> mozilla::operator*<mozilla::LayoutDevicePixel, mozilla::ScreenPixel>(mozilla::gfx::RectTyped<mozilla::LayoutDevicePixel, float> const&, mozilla::gfx::ScaleFactors2D<mozilla::LayoutDevicePixel, mozilla::ScreenPixel> const&)

Unexecuted instantiation: mozilla::gfx::RectTyped<mozilla::ParentLayerPixel, float> mozilla::operator*<mozilla::LayoutDevicePixel, mozilla::ParentLayerPixel>(mozilla::gfx::RectTyped<mozilla::LayoutDevicePixel, float> const&, mozilla::gfx::ScaleFactors2D<mozilla::LayoutDevicePixel, mozilla::ParentLayerPixel> const&)

Unexecuted instantiation: mozilla::gfx::RectTyped<mozilla::LayerPixel, float> mozilla::operator*<mozilla::LayoutDevicePixel, mozilla::LayerPixel>(mozilla::gfx::RectTyped<mozilla::LayoutDevicePixel, float> const&, mozilla::gfx::ScaleFactors2D<mozilla::LayoutDevicePixel, mozilla::LayerPixel> const&)

template<class src, class dst>

gfx::RectTyped<dst> operator/(const gfx::RectTyped<src>& aRect, const gfx::ScaleFactors2D<dst, src>& aScale) {

  return gfx::RectTyped<dst>(aRect.x / aScale.xScale,

                             aRect.y / aScale.yScale,

                             aRect.Width() / aScale.xScale,

                             aRect.Height() / aScale.yScale);

}

template<class src, class dst>

gfx::RectTyped<dst> operator*(const gfx::IntRectTyped<src>& aRect, const gfx::ScaleFactor<src, dst>& aScale) {

  return gfx::RectTyped<dst>(float(aRect.x) * aScale.scale,

                             float(aRect.y) * aScale.scale,

                             float(aRect.Width()) * aScale.scale,

                             float(aRect.Height()) * aScale.scale);

}

template<class src, class dst>

gfx::RectTyped<dst> operator/(const gfx::IntRectTyped<src>& aRect, const gfx::ScaleFactor<dst, src>& aScale) {

  return gfx::RectTyped<dst>(float(aRect.x) / aScale.scale,

                             float(aRect.y) / aScale.scale,

                             float(aRect.Width()) / aScale.scale,

                             float(aRect.Height()) / aScale.scale);

}

template<class src, class dst>

gfx::RectTyped<dst> operator*(const gfx::IntRectTyped<src>& aRect, const gfx::ScaleFactors2D<src, dst>& aScale) {

  return gfx::RectTyped<dst>(float(aRect.x) * aScale.xScale,

                             float(aRect.y) * aScale.yScale,

                             float(aRect.Width()) * aScale.xScale,

                             float(aRect.Height()) * aScale.yScale);

}

template<class src, class dst>

gfx::RectTyped<dst> operator/(const gfx::IntRectTyped<src>& aRect, const gfx::ScaleFactors2D<dst, src>& aScale) {

  return gfx::RectTyped<dst>(float(aRect.x) / aScale.xScale,

                             float(aRect.y) / aScale.yScale,

                             float(aRect.Width()) / aScale.xScale,

                             float(aRect.Height()) / aScale.yScale);

}

template<class src, class dst>

gfx::SizeTyped<dst> operator*(const gfx::SizeTyped<src>& aSize, const gfx::ScaleFactor<src, dst>& aScale) {

  return gfx::SizeTyped<dst>(aSize.width * aScale.scale,

                             aSize.height * aScale.scale);

}

Unexecuted instantiation: mozilla::gfx::SizeTyped<mozilla::ScreenPixel, float> mozilla::operator*<mozilla::CSSPixel, mozilla::ScreenPixel>(mozilla::gfx::SizeTyped<mozilla::CSSPixel, float> const&, mozilla::gfx::ScaleFactor<mozilla::CSSPixel, mozilla::ScreenPixel> const&)

Unexecuted instantiation: mozilla::gfx::SizeTyped<mozilla::LayoutDevicePixel, float> mozilla::operator*<mozilla::CSSPixel, mozilla::LayoutDevicePixel>(mozilla::gfx::SizeTyped<mozilla::CSSPixel, float> const&, mozilla::gfx::ScaleFactor<mozilla::CSSPixel, mozilla::LayoutDevicePixel> const&)

Unexecuted instantiation: mozilla::gfx::SizeTyped<mozilla::ScreenPixel, float> mozilla::operator*<mozilla::LayerPixel, mozilla::ScreenPixel>(mozilla::gfx::SizeTyped<mozilla::LayerPixel, float> const&, mozilla::gfx::ScaleFactor<mozilla::LayerPixel, mozilla::ScreenPixel> const&)

template<class src, class dst>

gfx::SizeTyped<dst> operator/(const gfx::SizeTyped<src>& aSize, const gfx::ScaleFactor<dst, src>& aScale) {

  return gfx::SizeTyped<dst>(aSize.width / aScale.scale,

                              aSize.height / aScale.scale);

}

template<class src, class dst>

gfx::SizeTyped<dst> operator*(const gfx::SizeTyped<src>& aSize, const gfx::ScaleFactors2D<src, dst>& aScale) {

  return gfx::SizeTyped<dst>(aSize.width * aScale.xScale,

                             aSize.height * aScale.yScale);

}

template<class src, class dst>

gfx::SizeTyped<dst> operator/(const gfx::SizeTyped<src>& aSize, const gfx::ScaleFactors2D<dst, src>& aScale) {

  return gfx::SizeTyped<dst>(aSize.width / aScale.xScale,

                             aSize.height / aScale.yScale);

}

Unexecuted instantiation: mozilla::gfx::SizeTyped<mozilla::CSSPixel, float> mozilla::operator/<mozilla::ParentLayerPixel, mozilla::CSSPixel>(mozilla::gfx::SizeTyped<mozilla::ParentLayerPixel, float> const&, mozilla::gfx::ScaleFactors2D<mozilla::CSSPixel, mozilla::ParentLayerPixel> const&)

Unexecuted instantiation: mozilla::gfx::SizeTyped<mozilla::CSSPixel, float> mozilla::operator/<mozilla::ScreenPixel, mozilla::CSSPixel>(mozilla::gfx::SizeTyped<mozilla::ScreenPixel, float> const&, mozilla::gfx::ScaleFactors2D<mozilla::CSSPixel, mozilla::ScreenPixel> const&)

template<class src, class dst>

gfx::SizeTyped<dst> operator*(const gfx::IntSizeTyped<src>& aSize, const gfx::ScaleFactor<src, dst>& aScale) {

  return gfx::SizeTyped<dst>(float(aSize.width) * aScale.scale,

                             float(aSize.height) * aScale.scale);

}

template<class src, class dst>

gfx::SizeTyped<dst> operator/(const gfx::IntSizeTyped<src>& aSize, const gfx::ScaleFactor<dst, src>& aScale) {

  return gfx::SizeTyped<dst>(float(aSize.width) / aScale.scale,

                             float(aSize.height) / aScale.scale);

}

template<class src, class dst>

gfx::SizeTyped<dst> operator*(const gfx::IntSizeTyped<src>& aSize, const gfx::ScaleFactors2D<src, dst>& aScale) {

  return gfx::SizeTyped<dst>(float(aSize.width) * aScale.xScale,

                             float(aSize.height) * aScale.yScale);

}

template<class src, class dst>

gfx::SizeTyped<dst> operator/(const gfx::IntSizeTyped<src>& aSize, const gfx::ScaleFactors2D<dst, src>& aScale) {

  return gfx::SizeTyped<dst>(float(aSize.width) / aScale.xScale,

                             float(aSize.height) / aScale.yScale);

}

template<class src, class dst>

gfx::MarginTyped<dst> operator*(const gfx::MarginTyped<src>& aMargin, const gfx::ScaleFactor<src, dst>& aScale) {

  return gfx::MarginTyped<dst>(aMargin.top * aScale.scale,

                               aMargin.right * aScale.scale,

                               aMargin.bottom * aScale.scale,

                               aMargin.left * aScale.scale);

}

template<class src, class dst>

gfx::MarginTyped<dst> operator/(const gfx::MarginTyped<src>& aMargin, const gfx::ScaleFactor<dst, src>& aScale) {

  return gfx::MarginTyped<dst>(aMargin.top / aScale.scale,

                               aMargin.right / aScale.scale,

                               aMargin.bottom / aScale.scale,

                               aMargin.left / aScale.scale);

}

template<class src, class dst>

gfx::MarginTyped<dst> operator*(const gfx::MarginTyped<src>& aMargin, const gfx::ScaleFactors2D<src, dst>& aScale) {

  return gfx::MarginTyped<dst>(aMargin.top * aScale.yScale,

                               aMargin.right * aScale.xScale,

                               aMargin.bottom * aScale.yScale,

                               aMargin.left * aScale.xScale);

}

template<class src, class dst>

gfx::MarginTyped<dst> operator/(const gfx::MarginTyped<src>& aMargin, const gfx::ScaleFactors2D<dst, src>& aScale) {

  return gfx::MarginTyped<dst>(aMargin.top / aScale.yScale,

                               aMargin.right / aScale.xScale,

                               aMargin.bottom / aScale.yScale,

                               aMargin.left / aScale.xScale);

}

// Calculate the max or min or the ratios of the widths and heights of two

// sizes, returning a scale factor in the correct units.

template<class src, class dst>

gfx::ScaleFactor<src, dst> MaxScaleRatio(const gfx::SizeTyped<dst>& aDestSize, const gfx::SizeTyped<src>& aSrcSize) {

  return gfx::ScaleFactor<src, dst>(std::max(aDestSize.width / aSrcSize.width,

                                             aDestSize.height / aSrcSize.height));

}

template<class src, class dst>

gfx::ScaleFactor<src, dst> MinScaleRatio(const gfx::SizeTyped<dst>& aDestSize, const gfx::SizeTyped<src>& aSrcSize) {

  return gfx::ScaleFactor<src, dst>(std::min(aDestSize.width / aSrcSize.width,

                                             aDestSize.height / aSrcSize.height));

}

template <typename T>

struct CoordOfImpl;

template <typename Units>

struct CoordOfImpl<gfx::PointTyped<Units>> {

  typedef gfx::CoordTyped<Units> Type;

};

template <typename Units>

struct CoordOfImpl<gfx::IntPointTyped<Units>> {

  typedef gfx::IntCoordTyped<Units> Type;

};

template <typename Units>

struct CoordOfImpl<gfx::RectTyped<Units>> {

  typedef gfx::CoordTyped<Units> Type;

};

template <typename Units>

struct CoordOfImpl<gfx::IntRectTyped<Units>> {

  typedef gfx::IntCoordTyped<Units> Type;

};

template <typename T>

using CoordOf = typename CoordOfImpl<T>::Type;

} // namespace mozilla

#endif