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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <cmath>
#include "content/public/common/page_zoom.h"
namespace content {
const double kMinimumZoomFactor = 0.25;
const double kMaximumZoomFactor = 5.0;
const double kEpsilon = 0.001;
const double kTextSizeMultiplierRatio = 1.2;
bool ZoomValuesEqual(double value_a, double value_b) {
return (std::fabs(value_a - value_b) <= kEpsilon);
}
double ZoomLevelToZoomFactor(double zoom_level) {
return std::pow(kTextSizeMultiplierRatio, zoom_level);
}
double ZoomFactorToZoomLevel(double factor) {
return std::log(factor) / std::log(kTextSizeMultiplierRatio);
}
} // namespace content
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