gecko-dev/layout/base/Units.h
Botond Ballo 69bfa032a3 Bug 1066259 - Fix operators for multiplying/dividing a Coord by a Scale. r=kats
--HG--
extra : rebase_source : e6efebeac8b6628b24e1596fb5dc78187c64e325
2014-09-12 17:46:05 -04:00

397 lines
17 KiB
C++

/* -*- 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/ScaleFactor.h"
#include "nsRect.h"
#include "nsMargin.h"
#include "mozilla/AppUnits.h"
#include "mozilla/TypeTraits.h"
namespace mozilla {
template <typename T>
struct IsPixel : FalseType {};
// See struct decleration for a description of each unit type
struct CSSPixel;
struct LayoutDevicePixel;
struct LayerPixel;
struct RenderTargetPixel;
struct ScreenPixel;
template<> struct IsPixel<CSSPixel> : TrueType {};
template<> struct IsPixel<LayoutDevicePixel> : TrueType {};
template<> struct IsPixel<LayerPixel> : TrueType {};
template<> struct IsPixel<RenderTargetPixel> : TrueType {};
template<> struct IsPixel<ScreenPixel> : 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::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::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::CoordTyped<ScreenPixel> ScreenCoord;
typedef gfx::IntCoordTyped<ScreenPixel> ScreenIntCoord;
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::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::ScaleFactor<CSSPixel, LayoutDevicePixel> CSSToLayoutDeviceScale;
typedef gfx::ScaleFactor<CSSPixel, LayerPixel> CSSToLayerScale;
typedef gfx::ScaleFactor<CSSPixel, ScreenPixel> CSSToScreenScale;
typedef gfx::ScaleFactor<LayoutDevicePixel, CSSPixel> LayoutDeviceToCSSScale;
typedef gfx::ScaleFactor<LayoutDevicePixel, LayerPixel> LayoutDeviceToLayerScale;
typedef gfx::ScaleFactor<LayoutDevicePixel, ScreenPixel> LayoutDeviceToScreenScale;
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<RenderTargetPixel, ScreenPixel> RenderTargetToScreenScale;
typedef gfx::ScaleFactor<ScreenPixel, CSSPixel> ScreenToCSSScale;
typedef gfx::ScaleFactor<ScreenPixel, LayoutDevicePixel> ScreenToLayoutDeviceScale;
typedef gfx::ScaleFactor<ScreenPixel, LayerPixel> ScreenToLayerScale;
/*
* 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 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 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())));
}
};
/*
* The pixels that are referred to as "device pixels" in layout code. In
* general this is obtained by converting a value in app units value by the
* AppUnitsPerDevPixel() value. The size of these pixels
* are affected by:
* 1) the "full zoom" (see nsPresContext::SetFullZoom)
* 2) the "widget scale" (see nsIWidget::GetDefaultScale)
*/
struct LayoutDevicePixel {
static LayoutDeviceIntPoint FromUntyped(const nsIntPoint& aPoint) {
return LayoutDeviceIntPoint(aPoint.x, aPoint.y);
}
static nsIntPoint ToUntyped(const LayoutDeviceIntPoint& aPoint) {
return nsIntPoint(aPoint.x, aPoint.y);
}
static LayoutDeviceIntRect FromUntyped(const nsIntRect& aRect) {
return LayoutDeviceIntRect(aRect.x, aRect.y, aRect.width, aRect.height);
}
static nsIntRect ToUntyped(const LayoutDeviceIntRect& aRect) {
return nsIntRect(aRect.x, aRect.y, aRect.width, aRect.height);
}
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 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 FromUntyped(aPoint.ToNearestPixels(aAppUnitsPerDevPixel));
}
static LayoutDeviceIntRect FromAppUnitsToNearest(const nsRect& aRect, nscoord aAppUnitsPerDevPixel) {
return FromUntyped(aRect.ToNearestPixels(aAppUnitsPerDevPixel));
}
static nsSize ToAppUnits(const LayoutDeviceIntSize& aSize, nscoord aAppUnitsPerDevPixel) {
return nsSize(aSize.width * aAppUnitsPerDevPixel,
aSize.height * aAppUnitsPerDevPixel);
}
};
/*
* The pixels that layout rasterizes and delivers to the graphics code.
* These are generally referred to as "device pixels" in layout code. Layer
* pixels are affected by:
* 1) the "display resolution" (see nsIPresShell::SetResolution)
* 2) the "full zoom" (see nsPresContext::SetFullZoom)
* 3) the "widget scale" (see nsIWidget::GetDefaultScale)
*/
struct LayerPixel {
static nsIntRect ToUntyped(const LayerIntRect& aRect) {
return nsIntRect(aRect.x, aRect.y, aRect.width, aRect.height);
}
static gfx::IntRect ToUnknown(const LayerIntRect& aRect) {
return gfx::IntRect(aRect.x, aRect.y, aRect.width, aRect.height);
}
static gfx::Rect ToUnknown(const LayerRect& aRect) {
return gfx::Rect(aRect.x, aRect.y, aRect.width, aRect.height);
}
static LayerIntRect FromUntyped(const nsIntRect& aRect) {
return LayerIntRect(aRect.x, aRect.y, aRect.width, aRect.height);
}
static LayerIntPoint FromUntyped(const nsIntPoint& aPoint) {
return LayerIntPoint(aPoint.x, aPoint.y);
}
};
/*
* 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 {
static nsIntPoint ToUntyped(const RenderTargetIntPoint& aPoint) {
return nsIntPoint(aPoint.x, aPoint.y);
}
static nsIntRect ToUntyped(const RenderTargetIntRect& aRect) {
return nsIntRect(aRect.x, aRect.y, aRect.width, aRect.height);
}
static gfx::IntRect ToUnknown(const RenderTargetIntRect& aRect) {
return gfx::IntRect(aRect.x, aRect.y, aRect.width, aRect.height);
}
static gfx::Rect ToUnknown(const RenderTargetRect& aRect) {
return gfx::Rect(aRect.x, aRect.y, aRect.width, aRect.height);
}
static RenderTargetRect FromUnknown(const gfx::Rect& aRect) {
return RenderTargetRect(aRect.x, aRect.y, aRect.width, aRect.height);
}
static RenderTargetIntRect FromUntyped(const nsIntRect& aRect) {
return RenderTargetIntRect(aRect.x, aRect.y, aRect.width, aRect.height);
}
};
/*
* 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 {
static ScreenIntPoint FromUntyped(const nsIntPoint& aPoint) {
return ScreenIntPoint(aPoint.x, aPoint.y);
}
};
// 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::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::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::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::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::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);
}
}
#endif