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comparison: layout/base/UnitTransforms.h
layout/base/UnitTransforms.h
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef MOZ_UNIT_TRANSFORMS_H_ | |
| 8 #define MOZ_UNIT_TRANSFORMS_H_ | |
| 9 | |
| 10 #include "Units.h" | |
| 11 | |
| 12 namespace mozilla { | |
| 13 | |
| 14 // Convenience functions for converting an entity from one strongly-typed | |
| 15 // coordinate system to another without changing the values it stores (this | |
| 16 // can be thought of as a cast). | |
| 17 // To use these functions, you must provide a justification for each use! | |
| 18 // Feel free to add more justifications to PixelCastJustification, along with | |
| 19 // a comment that explains under what circumstances it is appropriate to use. | |
| 20 | |
| 21 MOZ_BEGIN_ENUM_CLASS(PixelCastJustification, uint8_t) | |
| 22 // For the root layer, Screen Pixel = Parent Layer Pixel. | |
| 23 ScreenToParentLayerForRoot, | |
| 24 // For the root composition size we want to view it as layer pixels in any layer | |
| 25 ParentLayerToLayerForRootComposition | |
| 26 MOZ_END_ENUM_CLASS(PixelCastJustification) | |
| 27 | |
| 28 template <class TargetUnits, class SourceUnits> | |
| 29 gfx::SizeTyped<TargetUnits> ViewAs(const gfx::SizeTyped<SourceUnits>& aSize, PixelCastJustification) { | |
| 30 return gfx::SizeTyped<TargetUnits>(aSize.width, aSize.height); | |
| 31 } | |
| 32 template <class TargetUnits, class SourceUnits> | |
| 33 gfx::IntSizeTyped<TargetUnits> ViewAs(const gfx::IntSizeTyped<SourceUnits>& aSize, PixelCastJustification) { | |
| 34 return gfx::IntSizeTyped<TargetUnits>(aSize.width, aSize.height); | |
| 35 } | |
| 36 | |
| 37 // Convenience functions for casting untyped entities to typed entities. | |
| 38 // Using these functions does not require a justification, but once we convert | |
| 39 // all code to use strongly typed units they should not be needed any longer. | |
| 40 template <class TargetUnits> | |
| 41 gfx::PointTyped<TargetUnits> ViewAs(const gfxPoint& aPoint) { | |
| 42 return gfx::PointTyped<TargetUnits>(aPoint.x, aPoint.y); | |
| 43 } | |
| 44 template <class TargetUnits> | |
| 45 gfx::RectTyped<TargetUnits> ViewAs(const gfxRect& aRect) { | |
| 46 return gfx::RectTyped<TargetUnits>(aRect.x, aRect.y, aRect.width, aRect.height); | |
| 47 } | |
| 48 template <class TargetUnits> | |
| 49 gfx::IntSizeTyped<TargetUnits> ViewAs(const nsIntSize& aSize) { | |
| 50 return gfx::IntSizeTyped<TargetUnits>(aSize.width, aSize.height); | |
| 51 } | |
| 52 template <class TargetUnits> | |
| 53 gfx::IntPointTyped<TargetUnits> ViewAs(const nsIntPoint& aPoint) { | |
| 54 return gfx::IntPointTyped<TargetUnits>(aPoint.x, aPoint.y); | |
| 55 } | |
| 56 template <class TargetUnits> | |
| 57 gfx::IntRectTyped<TargetUnits> ViewAs(const nsIntRect& aRect) { | |
| 58 return gfx::IntRectTyped<TargetUnits>(aRect.x, aRect.y, aRect.width, aRect.height); | |
| 59 } | |
| 60 | |
| 61 // Convenience functions for casting typed entities to untyped entities. | |
| 62 // Using these functions does not require a justification, but once we convert | |
| 63 // all code to use strongly typed units they should not be needed any longer. | |
| 64 template <class SourceUnits> | |
| 65 gfxPoint ViewAsUntyped(const gfx::PointTyped<SourceUnits>& aPoint) { | |
| 66 return gfxPoint(aPoint.x, aPoint.y); | |
| 67 } | |
| 68 template <class SourceUnits> | |
| 69 gfxRect ViewAsUntyped(const gfx::RectTyped<SourceUnits>& aRect) { | |
| 70 return gfxRect(aRect.x, aRect.y, aRect.width, aRect.height); | |
| 71 } | |
| 72 | |
| 73 // Convenience functions for transforming an entity from one strongly-typed | |
| 74 // coordinate system to another using the provided transformation matrix. | |
| 75 template <typename TargetUnits, typename SourceUnits> | |
| 76 static gfx::PointTyped<TargetUnits> TransformTo(const gfx3DMatrix& aTransform, | |
| 77 const gfx::PointTyped<SourceUnits>& aPoint) | |
| 78 { | |
| 79 return ViewAs<TargetUnits>(aTransform.Transform(ViewAsUntyped(aPoint))); | |
| 80 } | |
| 81 template <typename TargetUnits, typename SourceUnits> | |
| 82 static gfx::RectTyped<TargetUnits> TransformTo(const gfx3DMatrix& aTransform, | |
| 83 const gfx::RectTyped<SourceUnits>& aRect) | |
| 84 { | |
| 85 return ViewAs<TargetUnits>(aTransform.TransformBounds(ViewAsUntyped(aRect))); | |
| 86 } | |
| 87 | |
| 88 | |
| 89 } | |
| 90 | |
| 91 #endif |
