diff options
Diffstat (limited to 'layout/base/Units.h')
| -rw-r--r-- | layout/base/Units.h | 654 |
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 |