AspectRatio.cpp - mozsearch

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/* -*- 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/. */

#include "AspectRatio.h"

#include "mozilla/WritingModes.h"

namespace mozilla {

nscoord AspectRatio::ComputeRatioDependentSize(

    LogicalAxis aRatioDependentAxis, const WritingMode& aWM,

    nscoord aRatioDeterminingSize,

    const LogicalSize& aContentBoxSizeToBoxSizingAdjust) const {

  MOZ_ASSERT(*this,

             "Infinite or zero ratio may have undefined behavior when "

             "computing the size");

  const LogicalSize& boxSizingAdjust = mUseBoxSizing == UseBoxSizing::No

                                           ? LogicalSize(aWM)

                                           : aContentBoxSizeToBoxSizingAdjust;

  return aRatioDependentAxis == LogicalAxis::Inline

             ? ConvertToWritingMode(aWM).ApplyTo(aRatioDeterminingSize +

                                                 boxSizingAdjust.BSize(aWM)) -

                   boxSizingAdjust.ISize(aWM)

             : ConvertToWritingMode(aWM).Inverted().ApplyTo(

                   aRatioDeterminingSize + boxSizingAdjust.ISize(aWM)) -

                   boxSizingAdjust.BSize(aWM);

}  // namespace mozilla