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78 lines
3.3 KiB
C++
78 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZ_UNIT_TRANSFORMS_H_
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#define MOZ_UNIT_TRANSFORMS_H_
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#include "Units.h"
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namespace mozilla {
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// Convenience functions for converting an entity from one strongly-typed
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// coordinate system to another without changing the values it stores (this
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// can be thought of as a cast).
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// To use these functions, you must provide a justification for each use!
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// Feel free to add more justifications to PixelCastJustification, along with
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// a comment that explains under what circumstances it is appropriate to use.
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MOZ_BEGIN_ENUM_CLASS(PixelCastJustification, uint8_t)
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// For the root layer, Screen Pixel = Parent Layer Pixel.
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ScreenToParentLayerForRoot
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MOZ_END_ENUM_CLASS(PixelCastJustification)
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template <class TargetUnits, class SourceUnits>
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gfx::SizeTyped<TargetUnits> ViewAs(const gfx::SizeTyped<SourceUnits>& aSize, PixelCastJustification) {
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return gfx::SizeTyped<TargetUnits>(aSize.width, aSize.height);
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}
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template <class TargetUnits, class SourceUnits>
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gfx::IntSizeTyped<TargetUnits> ViewAs(const gfx::IntSizeTyped<SourceUnits>& aSize, PixelCastJustification) {
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return gfx::IntSizeTyped<TargetUnits>(aSize.width, aSize.height);
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}
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// Convenience functions for casting untyped entities to typed entities.
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// Using these functions does not require a justification, but once we convert
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// all code to use strongly typed units they should not be needed any longer.
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template <class TargetUnits>
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gfx::PointTyped<TargetUnits> ViewAs(const gfxPoint& aPoint) {
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return gfx::PointTyped<TargetUnits>(aPoint.x, aPoint.y);
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}
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template <class TargetUnits>
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gfx::RectTyped<TargetUnits> ViewAs(const gfxRect& aRect) {
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return gfx::RectTyped<TargetUnits>(aRect.x, aRect.y, aRect.width, aRect.height);
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}
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// Convenience functions for casting typed entities to untyped entities.
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// Using these functions does not require a justification, but once we convert
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// all code to use strongly typed units they should not be needed any longer.
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template <class SourceUnits>
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gfxPoint ViewAsUntyped(const gfx::PointTyped<SourceUnits>& aPoint) {
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return gfxPoint(aPoint.x, aPoint.y);
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}
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template <class SourceUnits>
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gfxRect ViewAsUntyped(const gfx::RectTyped<SourceUnits>& aRect) {
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return gfxRect(aRect.x, aRect.y, aRect.width, aRect.height);
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}
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// Convenience functions for transforming an entity from one strongly-typed
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// coordinate system to another using the provided transformation matrix.
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template <typename TargetUnits, typename SourceUnits>
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static gfx::PointTyped<TargetUnits> TransformTo(const gfx3DMatrix& aTransform,
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const gfx::PointTyped<SourceUnits>& aPoint)
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{
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return ViewAs<TargetUnits>(aTransform.Transform(ViewAsUntyped(aPoint)));
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}
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template <typename TargetUnits, typename SourceUnits>
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static gfx::RectTyped<TargetUnits> TransformTo(const gfx3DMatrix& aTransform,
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const gfx::RectTyped<SourceUnits>& aRect)
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{
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return ViewAs<TargetUnits>(aTransform.TransformBounds(ViewAsUntyped(aRect)));
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}
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}
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#endif
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