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b04007c5c8
Since our goal is to use the root composition size to bound the layer size of the display port of the child layer this makes sense.
84 lines
3.5 KiB
C++
84 lines
3.5 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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// For the root composition size we want to view it as layer pixels in any layer
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ParentLayerToLayerForRootComposition
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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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template <class TargetUnits>
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gfx::IntSizeTyped<TargetUnits> ViewAs(const nsIntSize& aSize) {
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return gfx::IntSizeTyped<TargetUnits>(aSize.width, aSize.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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