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// Copyright 2019 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 "third_party/blink/renderer/core/accessibility/apply_dark_mode.h"
#include "base/metrics/field_trial_params.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/common/forcedark/forcedark_switches.h"
#include "third_party/blink/renderer/core/css/properties/css_property.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/graphics/color.h"
#include "third_party/blink/renderer/platform/graphics/dark_mode_color_classifier.h"
#include "third_party/blink/renderer/platform/graphics/dark_mode_settings.h"
namespace blink {
namespace {
const int kAlphaThreshold = 100;
const int kBrightnessThreshold = 50;
// TODO(https://crbug.com/925949): Add detection and classification of
// background image color. Most sites with dark background images also have a
// dark background color set, so this is less of a priority than it would be
// otherwise.
bool HasLightBackground(const LayoutView& root) {
const ComputedStyle& style = root.StyleRef();
// If we can't easily determine the background color, default to inverting the
// page.
if (!style.HasBackground())
return true;
Color color = style.VisitedDependentColor(GetCSSPropertyBackgroundColor());
if (color.Alpha() < kAlphaThreshold)
return true;
return DarkModeColorClassifier::CalculateColorBrightness(color) >
kBrightnessThreshold;
}
DarkModeInversionAlgorithm GetMode(const Settings& frame_settings) {
switch (features::kForceDarkInversionMethodParam.Get()) {
case ForceDarkInversionMethod::kUseBlinkSettings:
return frame_settings.GetForceDarkModeInversionAlgorithm();
case ForceDarkInversionMethod::kCielabBased:
return DarkModeInversionAlgorithm::kInvertLightnessLAB;
case ForceDarkInversionMethod::kHslBased:
return DarkModeInversionAlgorithm::kInvertLightness;
case ForceDarkInversionMethod::kRgbBased:
return DarkModeInversionAlgorithm::kInvertBrightness;
}
}
DarkModeImagePolicy GetImagePolicy(const Settings& frame_settings) {
switch (features::kForceDarkImageBehaviorParam.Get()) {
case ForceDarkImageBehavior::kUseBlinkSettings:
return frame_settings.GetForceDarkModeImagePolicy();
case ForceDarkImageBehavior::kInvertNone:
return DarkModeImagePolicy::kFilterNone;
case ForceDarkImageBehavior::kInvertSelectively:
return DarkModeImagePolicy::kFilterSmart;
}
}
int GetTextBrightnessThreshold(const Settings& frame_settings) {
const int flag_value = base::GetFieldTrialParamByFeatureAsInt(
features::kForceWebContentsDarkMode,
features::kForceDarkTextLightnessThresholdParam.name, -1);
return flag_value >= 0
? flag_value
: frame_settings.GetForceDarkModeTextBrightnessThreshold();
}
int GetBackgroundBrightnessThreshold(const Settings& frame_settings) {
const int flag_value = base::GetFieldTrialParamByFeatureAsInt(
features::kForceWebContentsDarkMode,
features::kForceDarkBackgroundLightnessThresholdParam.name, -1);
return flag_value >= 0
? flag_value
: frame_settings.GetForceDarkModeBackgroundBrightnessThreshold();
}
DarkModeSettings GetEnabledSettings(const Settings& frame_settings) {
DarkModeSettings settings;
settings.mode = GetMode(frame_settings);
settings.image_policy = GetImagePolicy(frame_settings);
settings.text_brightness_threshold =
GetTextBrightnessThreshold(frame_settings);
settings.background_brightness_threshold =
GetBackgroundBrightnessThreshold(frame_settings);
settings.grayscale = frame_settings.GetForceDarkModeGrayscale();
settings.contrast = frame_settings.GetForceDarkModeContrast();
settings.image_grayscale_percent =
frame_settings.GetForceDarkModeImageGrayscale();
return settings;
}
DarkModeSettings GetDisabledSettings() {
DarkModeSettings settings;
settings.mode = DarkModeInversionAlgorithm::kOff;
return settings;
}
} // namespace
DarkModeSettings BuildDarkModeSettings(const Settings& frame_settings,
const LayoutView& root) {
if (frame_settings.GetForceDarkModeEnabled() &&
ShouldApplyDarkModeFilterToPage(
frame_settings.GetForceDarkModePagePolicy(), root)) {
return GetEnabledSettings(frame_settings);
}
return GetDisabledSettings();
}
bool ShouldApplyDarkModeFilterToPage(DarkModePagePolicy policy,
const LayoutView& root) {
if (root.StyleRef().DarkColorScheme())
return false;
switch (policy) {
case DarkModePagePolicy::kFilterAll:
return true;
case DarkModePagePolicy::kFilterByBackground:
return HasLightBackground(root);
}
}
} // namespace blink
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