Source code
Revision control
Copy as Markdown
Other Tools
/* -*- 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
#ifndef MOZ_UNITS_H_
#define MOZ_UNITS_H_
#include <type_traits>
#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"
namespace mozilla {
template <typename T>
struct IsPixel : std::false_type {};
// See struct declaration for a description of each unit type.
struct CSSPixel;
struct OuterCSSPixel;
struct LayoutDevicePixel;
struct LayerPixel;
struct CSSTransformedLayerPixel;
struct RenderTargetPixel;
struct ScreenPixel;
struct ParentLayerPixel;
struct DesktopPixel;
struct ImagePixel;
struct ExternalPixel;
template <>
struct IsPixel<CSSPixel> : std::true_type {};
template <>
struct IsPixel<OuterCSSPixel> : std::true_type {};
template <>
struct IsPixel<LayoutDevicePixel> : std::true_type {};
template <>
struct IsPixel<LayerPixel> : std::true_type {};
template <>
struct IsPixel<CSSTransformedLayerPixel> : std::true_type {};
template <>
struct IsPixel<RenderTargetPixel> : std::true_type {};
template <>
struct IsPixel<ImagePixel> : std::true_type {};
template <>
struct IsPixel<ScreenPixel> : std::true_type {};
template <>
struct IsPixel<ParentLayerPixel> : std::true_type {};
template <>
struct IsPixel<DesktopPixel> : std::true_type {};
template <>
struct IsPixel<ExternalPixel> : std::true_type {};
typedef gfx::CoordTyped<CSSPixel> CSSCoord;
typedef gfx::IntCoordTyped<CSSPixel> CSSIntCoord;
typedef gfx::PointTyped<CSSPixel, double> CSSDoublePoint;
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<OuterCSSPixel> OuterCSSCoord;
typedef gfx::IntCoordTyped<OuterCSSPixel> OuterCSSIntCoord;
typedef gfx::PointTyped<OuterCSSPixel> OuterCSSPoint;
typedef gfx::IntPointTyped<OuterCSSPixel> OuterCSSIntPoint;
typedef gfx::SizeTyped<OuterCSSPixel> OuterCSSSize;
typedef gfx::IntSizeTyped<OuterCSSPixel> OuterCSSIntSize;
typedef gfx::RectTyped<OuterCSSPixel> OuterCSSRect;
typedef gfx::IntRectTyped<OuterCSSPixel> OuterCSSIntRect;
typedef gfx::MarginTyped<OuterCSSPixel> OuterCSSMargin;
typedef gfx::IntMarginTyped<OuterCSSPixel> OuterCSSIntMargin;
typedef gfx::IntRegionTyped<OuterCSSPixel> OuterCSSIntRegion;
typedef gfx::CoordTyped<LayoutDevicePixel, double> LayoutDeviceDoubleCoord;
typedef gfx::CoordTyped<LayoutDevicePixel> LayoutDeviceCoord;
typedef gfx::IntCoordTyped<LayoutDevicePixel> LayoutDeviceIntCoord;
typedef gfx::PointTyped<LayoutDevicePixel, double> LayoutDeviceDoublePoint;
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::PointTyped<ImagePixel> ImagePoint;
typedef gfx::IntPointTyped<ImagePixel> ImageIntPoint;
typedef gfx::SizeTyped<ImagePixel> ImageSize;
typedef gfx::IntSizeTyped<ImagePixel> ImageIntSize;
typedef gfx::RectTyped<ImagePixel> ImageRect;
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::CoordTyped<ExternalPixel> ExternalCoord;
typedef gfx::IntCoordTyped<ExternalPixel> ExternalIntCoord;
typedef gfx::PointTyped<ExternalPixel> ExternalPoint;
typedef gfx::IntPointTyped<ExternalPixel> ExternalIntPoint;
typedef gfx::SizeTyped<ExternalPixel> ExternalSize;
typedef gfx::IntSizeTyped<ExternalPixel> ExternalIntSize;
typedef gfx::RectTyped<ExternalPixel> ExternalRect;
typedef gfx::IntRectTyped<ExternalPixel> ExternalIntRect;
typedef gfx::MarginTyped<ExternalPixel> ExternalMargin;
typedef gfx::IntMarginTyped<ExternalPixel> ExternalIntMargin;
typedef gfx::IntRegionTyped<ExternalPixel> ExternalIntRegion;
typedef gfx::ScaleFactor<CSSPixel, CSSPixel> CSSToCSSScale;
typedef gfx::ScaleFactor<CSSPixel, OuterCSSPixel> CSSToOuterCSSScale;
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<CSSPixel, DesktopPixel> CSSToDesktopScale;
typedef gfx::ScaleFactor<OuterCSSPixel, LayoutDevicePixel>
OuterCSSToLayoutDeviceScale;
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::ScaleFactor<LayoutDevicePixel, DesktopPixel>
LayoutDeviceToDesktopScale;
typedef gfx::ScaleFactor<gfx::UnknownUnits, gfx::UnknownUnits>
UnknownScaleFactor;
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, ScreenPixel> ScreenToScreenScale2D;
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::ScaleFactors2D<gfx::UnknownUnits, gfx::UnknownUnits> Scale2D;
typedef gfx::Matrix4x4Typed<CSSPixel, CSSPixel> CSSToCSSMatrix4x4;
typedef gfx::Matrix4x4TypedFlagged<CSSPixel, CSSPixel> CSSToCSSMatrix4x4Flagged;
typedef gfx::Matrix4x4TypedFlagged<LayoutDevicePixel, LayoutDevicePixel>
LayoutDeviceToLayoutDeviceMatrix4x4Flagged;
typedef gfx::Matrix4x4Typed<LayoutDevicePixel, LayoutDevicePixel>
LayoutDeviceToLayoutDeviceMatrix4x4;
typedef gfx::Matrix4x4Typed<LayoutDevicePixel, ParentLayerPixel>
LayoutDeviceToParentLayerMatrix4x4;
typedef gfx::Matrix4x4Typed<LayerPixel, ParentLayerPixel>
LayerToParentLayerMatrix4x4;
typedef gfx::Matrix4x4Typed<LayerPixel, ScreenPixel> LayerToScreenMatrix4x4;
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;
typedef gfx::Matrix4x4Typed<ExternalPixel, ParentLayerPixel>
ExternalToParentLayerMatrix4x4;
/*
* 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 CSSIntCoord FromAppUnitsRounded(nscoord aCoord) {
return NSAppUnitsToIntPixels(aCoord, float(AppUnitsPerCSSPixel()));
}
static CSSPoint FromAppUnits(const nsPoint& aPoint) {
return CSSPoint(FromAppUnits(aPoint.x), FromAppUnits(aPoint.y));
}
static CSSSize FromAppUnits(const nsSize& aSize) {
return CSSSize(FromAppUnits(aSize.width), FromAppUnits(aSize.height));
}
static CSSRect FromAppUnits(const nsRect& aRect) {
return CSSRect(FromAppUnits(aRect.x), FromAppUnits(aRect.y),
FromAppUnits(aRect.Width()), FromAppUnits(aRect.Height()));
}
static CSSMargin FromAppUnits(const nsMargin& aMargin) {
return CSSMargin(FromAppUnits(aMargin.top), FromAppUnits(aMargin.right),
FromAppUnits(aMargin.bottom), FromAppUnits(aMargin.left));
}
static CSSIntPoint FromAppUnitsRounded(const nsPoint& aPoint) {
return CSSIntPoint(FromAppUnitsRounded(aPoint.x),
FromAppUnitsRounded(aPoint.y));
}
static CSSIntSize FromAppUnitsRounded(const nsSize& aSize) {
return CSSIntSize(FromAppUnitsRounded(aSize.width),
FromAppUnitsRounded(aSize.height));
}
static CSSIntRect FromAppUnitsRounded(const nsRect& aRect) {
return CSSIntRect(FromAppUnitsRounded(aRect.x),
FromAppUnitsRounded(aRect.y),
FromAppUnitsRounded(aRect.Width()),
FromAppUnitsRounded(aRect.Height()));
}
static CSSIntMargin FromAppUnitsRounded(const nsMargin& aMargin) {
return CSSIntMargin(
FromAppUnitsRounded(aMargin.top), FromAppUnitsRounded(aMargin.right),
FromAppUnitsRounded(aMargin.bottom), FromAppUnitsRounded(aMargin.left));
}
static CSSIntRect FromAppUnitsToNearest(const nsRect& aRect) {
return CSSIntRect::FromUnknownRect(
aRect.ToNearestPixels(AppUnitsPerCSSPixel()));
}
static CSSIntRect FromAppUnitsToInside(const nsRect& aRect) {
return CSSIntRect::FromUnknownRect(
aRect.ToInsidePixels(AppUnitsPerCSSPixel()));
}
// Conversions to app units
// TODO: We might want an int32_t/CSSIntCoord overload which doesn't do float
// math but we'd need to ensure stuff is clamped to nscoord_MIN/MAX range.
static nscoord ToAppUnits(CSSCoord aCoord) {
return NSFloatPixelsToAppUnits(aCoord, AppUnitsPerCSSPixel());
}
static nsPoint ToAppUnits(const CSSPoint& aPoint) {
return nsPoint(ToAppUnits(aPoint.x), ToAppUnits(aPoint.y));
}
static nsPoint ToAppUnits(const CSSIntPoint& aPoint) {
return nsPoint(ToAppUnits(CSSCoord(aPoint.x)),
ToAppUnits(CSSCoord(aPoint.y)));
}
static nsSize ToAppUnits(const CSSSize& aSize) {
return nsSize(ToAppUnits(aSize.width), ToAppUnits(aSize.height));
}
static nsSize ToAppUnits(const CSSIntSize& aSize) {
return nsSize(ToAppUnits(aSize.width), ToAppUnits(aSize.height));
}
static nsRect ToAppUnits(const CSSRect& aRect) {
return nsRect(ToAppUnits(aRect.x), ToAppUnits(aRect.y),
ToAppUnits(aRect.Width()), ToAppUnits(aRect.Height()));
}
static nsRect ToAppUnits(const CSSIntRect& aRect) {
return nsRect(ToAppUnits(aRect.x), ToAppUnits(aRect.y),
ToAppUnits(aRect.Width()), ToAppUnits(aRect.Height()));
}
static nsMargin ToAppUnits(const CSSMargin& aMargin) {
return nsMargin(ToAppUnits(aMargin.top), ToAppUnits(aMargin.right),
ToAppUnits(aMargin.bottom), ToAppUnits(aMargin.left));
}
static nsMargin ToAppUnits(const CSSIntMargin& aMargin) {
return nsMargin(ToAppUnits(CSSCoord(aMargin.top)),
ToAppUnits(CSSCoord(aMargin.right)),
ToAppUnits(CSSCoord(aMargin.bottom)),
ToAppUnits(CSSCoord(aMargin.left)));
}
// Conversion from a given CSS point value.
static CSSCoord FromPoints(float aCoord) {
// One inch / 72.
return aCoord * 96.0f / 72.0f;
}
};
/*
* In the context of a scroll frame that is zoomable, OuterCSSPixel is
* used to disambiguate CSS pixels of the content outside of the scroll
* frame (which is not subject to the zoom) from CSS pixels of the content
* inside the scroll frame (which is, and for which CSSPixel is used).
*/
struct OuterCSSPixel {
static OuterCSSCoord FromAppUnits(nscoord aCoord) {
return NSAppUnitsToFloatPixels(aCoord, 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 LayoutDeviceCoord FromAppUnits(nscoord aCoord,
nscoord aAppUnitsPerDevPixel) {
return LayoutDeviceCoord(
NSAppUnitsToFloatPixels(aCoord, float(aAppUnitsPerDevPixel)));
}
static LayoutDeviceIntCoord FromAppUnitsRounded(
nscoord aCoord, nscoord aAppUnitsPerDevPixel) {
return LayoutDeviceIntCoord(
NSAppUnitsToIntPixels(aCoord, float(aAppUnitsPerDevPixel)));
}
static LayoutDeviceRect FromAppUnits(const nsRect& aRect,
nscoord aAppUnitsPerDevPixel) {
return LayoutDeviceRect(FromAppUnits(aRect.x, aAppUnitsPerDevPixel),
FromAppUnits(aRect.y, aAppUnitsPerDevPixel),
FromAppUnits(aRect.Width(), aAppUnitsPerDevPixel),
FromAppUnits(aRect.Height(), aAppUnitsPerDevPixel));
}
static LayoutDeviceSize FromAppUnits(const nsSize& aSize,
nscoord aAppUnitsPerDevPixel) {
return LayoutDeviceSize(FromAppUnits(aSize.width, aAppUnitsPerDevPixel),
FromAppUnits(aSize.height, aAppUnitsPerDevPixel));
}
static LayoutDevicePoint FromAppUnits(const nsPoint& aPoint,
nscoord aAppUnitsPerDevPixel) {
return LayoutDevicePoint(FromAppUnits(aPoint.x, aAppUnitsPerDevPixel),
FromAppUnits(aPoint.y, aAppUnitsPerDevPixel));
}
static LayoutDeviceMargin FromAppUnits(const nsMargin& aMargin,
nscoord aAppUnitsPerDevPixel) {
return LayoutDeviceMargin(
FromAppUnits(aMargin.top, aAppUnitsPerDevPixel),
FromAppUnits(aMargin.right, aAppUnitsPerDevPixel),
FromAppUnits(aMargin.bottom, aAppUnitsPerDevPixel),
FromAppUnits(aMargin.left, aAppUnitsPerDevPixel));
}
static LayoutDeviceIntPoint FromAppUnitsRounded(
const nsPoint& aPoint, nscoord aAppUnitsPerDevPixel) {
return LayoutDeviceIntPoint(
FromAppUnitsRounded(aPoint.x, aAppUnitsPerDevPixel),
FromAppUnitsRounded(aPoint.y, aAppUnitsPerDevPixel));
}
static LayoutDeviceIntRect FromAppUnitsRounded(const nsRect& aRect,
nscoord aAppUnitsPerDevPixel) {
return LayoutDeviceIntRect(
FromAppUnitsRounded(aRect.x, aAppUnitsPerDevPixel),
FromAppUnitsRounded(aRect.y, aAppUnitsPerDevPixel),
FromAppUnitsRounded(aRect.Width(), aAppUnitsPerDevPixel),
FromAppUnitsRounded(aRect.Height(), 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(
FromAppUnitsRounded(aSize.width, aAppUnitsPerDevPixel),
FromAppUnitsRounded(aSize.height, aAppUnitsPerDevPixel));
}
static LayoutDeviceIntMargin FromAppUnitsRounded(
const nsMargin& aMargin, nscoord aAppUnitsPerDevPixel) {
return LayoutDeviceIntMargin(
FromAppUnitsRounded(aMargin.top, aAppUnitsPerDevPixel),
FromAppUnitsRounded(aMargin.right, aAppUnitsPerDevPixel),
FromAppUnitsRounded(aMargin.bottom, aAppUnitsPerDevPixel),
FromAppUnitsRounded(aMargin.left, aAppUnitsPerDevPixel));
}
static nscoord ToAppUnits(LayoutDeviceIntCoord aCoord,
nscoord aAppUnitsPerDevPixel) {
return aCoord * aAppUnitsPerDevPixel;
}
static nscoord ToAppUnits(int32_t aCoord, nscoord aAppUnitsPerDevPixel) {
return ToAppUnits(LayoutDeviceIntCoord(aCoord), aAppUnitsPerDevPixel);
}
static nscoord ToAppUnits(LayoutDeviceCoord aCoord,
nscoord aAppUnitsPerDevPixel) {
return NSFloatPixelsToAppUnits(aCoord, aAppUnitsPerDevPixel);
}
static nscoord ToAppUnits(float aCoord, nscoord aAppUnitsPerDevPixel) {
return ToAppUnits(LayoutDeviceCoord(aCoord), aAppUnitsPerDevPixel);
}
static nscoord ToAppUnits(double aCoord, nscoord aAppUnitsPerDevPixel) {
return ToAppUnits(LayoutDeviceDoubleCoord(aCoord), aAppUnitsPerDevPixel);
}
static nscoord ToAppUnits(LayoutDeviceDoubleCoord aCoord,
nscoord aAppUnitsPerDevPixel) {
return NSDoublePixelsToAppUnits(aCoord, aAppUnitsPerDevPixel);
}
static nsPoint ToAppUnits(const LayoutDeviceIntPoint& aPoint,
nscoord aAppUnitsPerDevPixel) {
return nsPoint(ToAppUnits(aPoint.x, aAppUnitsPerDevPixel),
ToAppUnits(aPoint.y, aAppUnitsPerDevPixel));
}
static nsPoint ToAppUnits(const LayoutDevicePoint& aPoint,
nscoord aAppUnitsPerDevPixel) {
return nsPoint(ToAppUnits(aPoint.x, aAppUnitsPerDevPixel),
ToAppUnits(aPoint.y, aAppUnitsPerDevPixel));
}
static nsPoint ToAppUnits(const LayoutDeviceDoublePoint& aPoint,
nscoord aAppUnitsPerDevPixel) {
return nsPoint(ToAppUnits(aPoint.x, aAppUnitsPerDevPixel),
ToAppUnits(aPoint.y, aAppUnitsPerDevPixel));
}
static nsSize ToAppUnits(const LayoutDeviceIntSize& aSize,
nscoord aAppUnitsPerDevPixel) {
return nsSize(ToAppUnits(aSize.width, aAppUnitsPerDevPixel),
ToAppUnits(aSize.height, aAppUnitsPerDevPixel));
}
static nsSize ToAppUnits(const LayoutDeviceSize& aSize,
nscoord aAppUnitsPerDevPixel) {
return nsSize(ToAppUnits(aSize.width, aAppUnitsPerDevPixel),
ToAppUnits(aSize.height, aAppUnitsPerDevPixel));
}
static nsRect ToAppUnits(const LayoutDeviceIntRect& aRect,
nscoord aAppUnitsPerDevPixel) {
return nsRect(ToAppUnits(aRect.x, aAppUnitsPerDevPixel),
ToAppUnits(aRect.y, aAppUnitsPerDevPixel),
ToAppUnits(aRect.Width(), aAppUnitsPerDevPixel),
ToAppUnits(aRect.Height(), aAppUnitsPerDevPixel));
}
static nsRect ToAppUnits(const LayoutDeviceRect& aRect,
nscoord aAppUnitsPerDevPixel) {
return nsRect(ToAppUnits(aRect.x, aAppUnitsPerDevPixel),
ToAppUnits(aRect.y, aAppUnitsPerDevPixel),
ToAppUnits(aRect.Width(), aAppUnitsPerDevPixel),
ToAppUnits(aRect.Height(), aAppUnitsPerDevPixel));
}
static nsMargin ToAppUnits(const LayoutDeviceIntMargin& aMargin,
nscoord aAppUnitsPerDevPixel) {
return nsMargin(ToAppUnits(aMargin.top, aAppUnitsPerDevPixel),
ToAppUnits(aMargin.right, aAppUnitsPerDevPixel),
ToAppUnits(aMargin.bottom, aAppUnitsPerDevPixel),
ToAppUnits(aMargin.left, aAppUnitsPerDevPixel));
}
static nsMargin ToAppUnits(const LayoutDeviceMargin& aMargin,
nscoord aAppUnitsPerDevPixel) {
return nsMargin(ToAppUnits(aMargin.top, aAppUnitsPerDevPixel),
ToAppUnits(aMargin.right, aAppUnitsPerDevPixel),
ToAppUnits(aMargin.bottom, aAppUnitsPerDevPixel),
ToAppUnits(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 PresShell::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
* 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 {};
struct ExternalPixel {};
// 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, class F>
gfx::PointTyped<Dst, F> operator*(const gfx::PointTyped<Src, F>& aPoint,
const gfx::ScaleFactor<Src, Dst>& aScale) {
return gfx::PointTyped<Dst, F>(aPoint.x * aScale.scale,
aPoint.y * aScale.scale);
}
template <class Src, class Dst, class F>
gfx::PointTyped<Dst, F> operator/(const gfx::PointTyped<Src, F>& aPoint,
const gfx::ScaleFactor<Dst, Src>& aScale) {
return gfx::PointTyped<Dst, F>(aPoint.x / aScale.scale,
aPoint.y / aScale.scale);
}
template <class Src, class Dst, class F>
gfx::PointTyped<Dst, F> operator*(
const gfx::PointTyped<Src, F>& aPoint,
const gfx::BaseScaleFactors2D<Src, Dst, F>& aScale) {
return gfx::PointTyped<Dst, F>(aPoint.x * aScale.xScale,
aPoint.y * aScale.yScale);
}
template <class Src, class Dst, class F>
gfx::PointTyped<Dst, F> operator/(
const gfx::PointTyped<Src, F>& aPoint,
const gfx::BaseScaleFactors2D<Dst, Src, F>& aScale) {
return gfx::PointTyped<Dst, F>(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, class F>
gfx::PointTyped<Dst, F> operator*(
const gfx::IntPointTyped<Src>& aPoint,
const gfx::BaseScaleFactors2D<Src, Dst, F>& aScale) {
return gfx::PointTyped<Dst, F>(F(aPoint.x) * aScale.xScale,
F(aPoint.y) * aScale.yScale);
}
template <class Src, class Dst, class F>
gfx::PointTyped<Dst, F> operator/(
const gfx::IntPointTyped<Src>& aPoint,
const gfx::BaseScaleFactors2D<Dst, Src, F>& aScale) {
return gfx::PointTyped<Dst, F>(F(aPoint.x) / aScale.xScale,
F(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, class F>
gfx::RectTyped<Dst, F> operator*(
const gfx::RectTyped<Src, F>& aRect,
const gfx::BaseScaleFactors2D<Src, Dst, F>& aScale) {
return gfx::RectTyped<Dst, F>(
aRect.x * aScale.xScale, aRect.y * aScale.yScale,
aRect.Width() * aScale.xScale, aRect.Height() * aScale.yScale);
}
template <class Src, class Dst, class F>
gfx::RectTyped<Dst, F> operator/(
const gfx::RectTyped<Src, F>& aRect,
const gfx::BaseScaleFactors2D<Dst, Src, F>& aScale) {
return gfx::RectTyped<Dst, F>(
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, class F>
gfx::RectTyped<Dst, F> operator*(
const gfx::IntRectTyped<Src>& aRect,
const gfx::BaseScaleFactors2D<Src, Dst, F>& aScale) {
return gfx::RectTyped<Dst, F>(
F(aRect.x) * aScale.xScale, F(aRect.y) * aScale.yScale,
F(aRect.Width()) * aScale.xScale, F(aRect.Height()) * aScale.yScale);
}
template <class Src, class Dst, class F>
gfx::RectTyped<Dst, F> operator/(
const gfx::IntRectTyped<Src>& aRect,
const gfx::BaseScaleFactors2D<Dst, Src, F>& aScale) {
return gfx::RectTyped<Dst, F>(
F(aRect.x) / aScale.xScale, F(aRect.y) / aScale.yScale,
F(aRect.Width()) / aScale.xScale, F(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, class F>
gfx::SizeTyped<Dst, F> operator*(
const gfx::SizeTyped<Src, F>& aSize,
const gfx::BaseScaleFactors2D<Src, Dst, F>& aScale) {
return gfx::SizeTyped<Dst, F>(aSize.width * aScale.xScale,
aSize.height * aScale.yScale);
}
template <class Src, class Dst, class F>
gfx::SizeTyped<Dst, F> operator/(
const gfx::SizeTyped<Src, F>& aSize,
const gfx::BaseScaleFactors2D<Dst, Src, F>& aScale) {
return gfx::SizeTyped<Dst, F>(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, class F>
gfx::SizeTyped<Dst, F> operator*(
const gfx::IntSizeTyped<Src>& aSize,
const gfx::BaseScaleFactors2D<Src, Dst, F>& aScale) {
return gfx::SizeTyped<Dst, F>(F(aSize.width) * aScale.xScale,
F(aSize.height) * aScale.yScale);
}
template <class Src, class Dst, class F>
gfx::SizeTyped<Dst, F> operator/(
const gfx::IntSizeTyped<Src>& aSize,
const gfx::BaseScaleFactors2D<Dst, Src, F>& aScale) {
return gfx::SizeTyped<Dst, F>(F(aSize.width) / aScale.xScale,
F(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.value * aScale.scale, aMargin.right.value * aScale.scale,
aMargin.bottom.value * aScale.scale, aMargin.left.value * 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.value / aScale.scale, aMargin.right.value / aScale.scale,
aMargin.bottom.value / aScale.scale, aMargin.left.value / aScale.scale);
}
template <class Src, class Dst, class F>
gfx::MarginTyped<Dst, F> operator*(
const gfx::MarginTyped<Src, F>& aMargin,
const gfx::BaseScaleFactors2D<Src, Dst, F>& aScale) {
return gfx::MarginTyped<Dst, F>(
aMargin.top.value * aScale.yScale, aMargin.right.value * aScale.xScale,
aMargin.bottom.value * aScale.yScale, aMargin.left.value * aScale.xScale);
}
template <class Src, class Dst, class F>
gfx::MarginTyped<Dst, F> operator/(
const gfx::MarginTyped<Src, F>& aMargin,
const gfx::BaseScaleFactors2D<Dst, Src, F>& aScale) {
return gfx::MarginTyped<Dst, F>(
aMargin.top.value / aScale.yScale, aMargin.right.value / aScale.xScale,
aMargin.bottom.value / aScale.yScale, aMargin.left.value / 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) {
MOZ_ASSERT(aSrcSize.width != 0 && aSrcSize.height != 0,
"Caller must verify aSrcSize has nonzero components, "
"to avoid division by 0 here");
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) {
MOZ_ASSERT(aSrcSize.width != 0 && aSrcSize.height != 0,
"Caller must verify aSrcSize has nonzero components, "
"to avoid division by 0 here");
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 Units>
struct CoordOfImpl<gfx::SizeTyped<Units>> {
typedef gfx::CoordTyped<Units> Type;
};
template <typename T>
using CoordOf = typename CoordOfImpl<T>::Type;
} // namespace mozilla
#endif