page_zoom.cc | Explore in Territory

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/public/common/page/page_zoom.h"

#include <cmath>

#include "build/build_config.h"

namespace blink {

static constexpr double kPresetBrowserZoomFactorsArray[] = …;
const base::span<const double> kPresetBrowserZoomFactors(
    kPresetBrowserZoomFactorsArray);

#if !BUILDFLAG(IS_ANDROID)
// The minimum and maximum amount of page zoom that is possible, independent
// of other factors such as device scale and page scale (pinch). Historically,
// these values came from WebKitLegacy/mac/WebView/WebView.mm where they are
// named MinimumZoomMultiplier and MaximumZoomMultiplier. But chromium has
// changed to use different limits.
const double kMinimumBrowserZoomFactor = …;
const double kMaximumBrowserZoomFactor = …;
#else
// On Android, the OS-level font size is considered when calculating zoom
// factor. At the OS-level, we support a range of 85% - 200%, and at the
// browser-level we support 50% - 300%. The max we support is therefore: 3.0 * 2
// = 6.0, and the min is 0.5 * .85 = .425 (depending on settings).
const double kMinimumBrowserZoomFactor = 0.425;
const double kMaximumBrowserZoomFactor = 6.0;
#endif

// Change the zoom factor by 20% for each zoom level increase from the user.
// Historically, this value came from WebKit in
// WebKitLegacy/mac/WebView/WebView.mm (named as ZoomMultiplierRatio there).
static const double kTextSizeMultiplierRatio = …;

double ZoomLevelToZoomFactor(double zoom_level) { … }

double ZoomFactorToZoomLevel(double zoom_factor) { … }

bool ZoomValuesEqual(double value_a, double value_b) { … }

}  // namespace blink
chromium/third_party/blink/common/page/page_zoom.cc
