forked from mirrors/gecko-dev
dd66dfe12b
Differential Revision: https://phabricator.services.mozilla.com/D38419 --HG-- extra : moz-landing-system : lando
52 lines
1.7 KiB
C++
52 lines
1.7 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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#include "nsViewportInfo.h"
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#include "mozilla/Assertions.h"
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#include <algorithm>
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using namespace mozilla;
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void nsViewportInfo::ConstrainViewportValues() {
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// Non-positive zoom factors can produce NaN or negative viewport sizes,
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// so we better be sure our constraints will produce positive zoom factors.
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MOZ_ASSERT(mMinZoom > CSSToScreenScale(0.0f), "zoom factor must be positive");
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MOZ_ASSERT(mMaxZoom > CSSToScreenScale(0.0f), "zoom factor must be positive");
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if (mDefaultZoom > mMaxZoom) {
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mDefaultZoomValid = false;
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mDefaultZoom = mMaxZoom;
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}
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if (mDefaultZoom < mMinZoom) {
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mDefaultZoomValid = false;
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mDefaultZoom = mMinZoom;
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}
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}
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static const float& MinOrMax(const float& aA, const float& aB,
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const float& (*aMinOrMax)(const float&,
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const float&)) {
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MOZ_ASSERT(
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aA != nsViewportInfo::ExtendToZoom && aA != nsViewportInfo::DeviceSize &&
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aB != nsViewportInfo::ExtendToZoom && aB != nsViewportInfo::DeviceSize);
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if (aA == nsViewportInfo::Auto) {
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return aB;
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}
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if (aB == nsViewportInfo::Auto) {
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return aA;
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}
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return aMinOrMax(aA, aB);
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}
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// static
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const float& nsViewportInfo::Min(const float& aA, const float& aB) {
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return MinOrMax(aA, aB, std::min);
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}
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// static
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const float& nsViewportInfo::Max(const float& aA, const float& aB) {
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return MinOrMax(aA, aB, std::max);
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}
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