forked from mirrors/gecko-dev
aa5a49c072
Modified headers:
gfx/2d/{Coord.h,Point.h,Rect.h,ScaleFactor.h,ScaleFactors2D.h}
layout/base/Units.h
Differential Revision: https://phabricator.services.mozilla.com/D145830
98 lines
2.8 KiB
C++
98 lines
2.8 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 MOZILLA_GFX_SCALEFACTOR_H_
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#define MOZILLA_GFX_SCALEFACTOR_H_
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#include <ostream>
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#include "mozilla/Attributes.h"
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#include "gfxPoint.h"
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namespace mozilla {
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namespace gfx {
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/*
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* This class represents a scaling factor between two different pixel unit
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* systems. This is effectively a type-safe float, intended to be used in
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* combination with the known-type instances of gfx::Point, gfx::Rect, etc.
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*
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* This class is meant to be used in cases where a single scale applies to
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* both the x and y axes. For cases where two diferent scales apply, use
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* ScaleFactors2D.
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*/
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template <class Src, class Dst>
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struct ScaleFactor {
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float scale;
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constexpr ScaleFactor() : scale(1.0) {}
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constexpr ScaleFactor(const ScaleFactor<Src, Dst>& aCopy)
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: scale(aCopy.scale) {}
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explicit constexpr ScaleFactor(float aScale) : scale(aScale) {}
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ScaleFactor<Dst, Src> Inverse() { return ScaleFactor<Dst, Src>(1 / scale); }
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ScaleFactor<Src, Dst>& operator=(const ScaleFactor<Src, Dst>&) = default;
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bool operator==(const ScaleFactor<Src, Dst>& aOther) const {
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return scale == aOther.scale;
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}
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bool operator!=(const ScaleFactor<Src, Dst>& aOther) const {
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return !(*this == aOther);
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}
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bool operator<(const ScaleFactor<Src, Dst>& aOther) const {
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return scale < aOther.scale;
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}
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bool operator<=(const ScaleFactor<Src, Dst>& aOther) const {
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return scale <= aOther.scale;
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}
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bool operator>(const ScaleFactor<Src, Dst>& aOther) const {
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return scale > aOther.scale;
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}
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bool operator>=(const ScaleFactor<Src, Dst>& aOther) const {
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return scale >= aOther.scale;
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}
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template <class Other>
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ScaleFactor<Other, Dst> operator/(
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const ScaleFactor<Src, Other>& aOther) const {
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return ScaleFactor<Other, Dst>(scale / aOther.scale);
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}
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template <class Other>
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ScaleFactor<Src, Other> operator/(
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const ScaleFactor<Other, Dst>& aOther) const {
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return ScaleFactor<Src, Other>(scale / aOther.scale);
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}
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template <class Other>
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ScaleFactor<Src, Other> operator*(
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const ScaleFactor<Dst, Other>& aOther) const {
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return ScaleFactor<Src, Other>(scale * aOther.scale);
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}
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template <class Other>
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ScaleFactor<Other, Dst> operator*(
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const ScaleFactor<Other, Src>& aOther) const {
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return ScaleFactor<Other, Dst>(scale * aOther.scale);
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}
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friend std::ostream& operator<<(std::ostream& aStream,
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const ScaleFactor<Src, Dst>& aSF) {
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return aStream << aSF.scale;
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}
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};
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} // namespace gfx
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} // namespace mozilla
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#endif /* MOZILLA_GFX_SCALEFACTOR_H_ */
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