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-rw-r--r--layout/generic/AspectRatio.cpp32
1 files changed, 32 insertions, 0 deletions
diff --git a/layout/generic/AspectRatio.cpp b/layout/generic/AspectRatio.cpp
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+++ b/layout/generic/AspectRatio.cpp
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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::eLogicalAxisInline
+ ? ConvertToWritingMode(aWM).ApplyTo(aRatioDeterminingSize +
+ boxSizingAdjust.BSize(aWM)) -
+ boxSizingAdjust.ISize(aWM)
+ : ConvertToWritingMode(aWM).Inverted().ApplyTo(
+ aRatioDeterminingSize + boxSizingAdjust.ISize(aWM)) -
+ boxSizingAdjust.BSize(aWM);
+}
+
+} // namespace mozilla