Add m-esr52 at 52.6.0

1 files changed, 654 insertions, 0 deletions

diff --git a/layout/base/Units.h b/layout/base/Units.h
new file mode 100644
index 000000000..199a91902
--- /dev/null
+++ b/layout/base/Units.h
@@ -0,0 +1,654 @@
+/* -*- 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/Matrix.h"
+#include "mozilla/gfx/Point.h"
+#include "mozilla/gfx/Rect.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;
+
+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<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::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::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, 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;
+
+/*
+ * The pixels that content authors use to specify sizes in.
+ */
+struct CSSPixel {
+
+  // Conversions from app units
+
+  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())));
+  }
+
+  // Conversions to app units
+
+  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 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 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));
+  }
+};
+
+/*
+ * 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 {
+};
+
+/*
+ * 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);
+}
+
+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);
+}
+
+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);
+}
+
+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);
+}
+
+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));
+}
+
+} // namespace mozilla
+
+#endif