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// Copyright 2020 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 "components/live_caption/caption_util.h"
#include <stddef.h>
#include "base/command_line.h"
#include "base/cpu.h"
#include "base/feature_list.h"
#include "base/metrics/histogram_functions.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "components/live_caption/pref_names.h"
#include "components/prefs/pref_service.h"
#include "media/base/media_switches.h"
#include "ui/base/ui_base_switches.h"
#include "ui/native_theme/native_theme.h"
#if BUILDFLAG(IS_CHROMEOS_ASH)
#include "ash/constants/ash_features.h"
#endif
#if BUILDFLAG(IS_CHROMEOS_LACROS)
#include "chromeos/lacros/lacros_service.h"
#endif
namespace {
// Returns whether the style is default or not. If the user has changed any of
// the captions settings from the default value, that is an interesting metric
// to observe.
bool IsDefaultStyle(absl::optional<ui::CaptionStyle> style) {
return (style.has_value() && style->text_size.empty() &&
style->font_family.empty() && style->text_color.empty() &&
style->background_color.empty() && style->text_shadow.empty());
}
// Adds !important to all captions styles. They should always override any
// styles added by the video author or by a user stylesheet. This is because in
// Chrome, there is an option to turn off captions styles, so any time the
// captions are on, the styles should take priority.
std::string AddCSSImportant(std::string css_string) {
return css_string.empty() ? "" : css_string + " !important";
}
// Constructs the CaptionStyle struct from the caption-related preferences.
absl::optional<ui::CaptionStyle> GetCaptionStyleFromPrefs(PrefService* prefs) {
if (!prefs) {
return absl::nullopt;
}
ui::CaptionStyle style;
style.text_size =
AddCSSImportant(prefs->GetString(prefs::kAccessibilityCaptionsTextSize));
style.font_family =
AddCSSImportant(prefs->GetString(prefs::kAccessibilityCaptionsTextFont));
if (!prefs->GetString(prefs::kAccessibilityCaptionsTextColor).empty()) {
std::string text_color = base::StringPrintf(
"rgba(%s,%s)",
prefs->GetString(prefs::kAccessibilityCaptionsTextColor).c_str(),
base::NumberToString(
prefs->GetInteger(prefs::kAccessibilityCaptionsTextOpacity) / 100.0)
.c_str());
style.text_color = AddCSSImportant(text_color);
}
if (!prefs->GetString(prefs::kAccessibilityCaptionsBackgroundColor).empty()) {
std::string background_color = base::StringPrintf(
"rgba(%s,%s)",
prefs->GetString(prefs::kAccessibilityCaptionsBackgroundColor).c_str(),
base::NumberToString(
prefs->GetInteger(prefs::kAccessibilityCaptionsBackgroundOpacity) /
100.0)
.c_str());
style.background_color = AddCSSImportant(background_color);
}
style.text_shadow = AddCSSImportant(
prefs->GetString(prefs::kAccessibilityCaptionsTextShadow));
return style;
}
} // namespace
namespace captions {
absl::optional<ui::CaptionStyle> GetCaptionStyleFromUserSettings(
PrefService* prefs,
bool record_metrics) {
// Apply native CaptionStyle parameters.
absl::optional<ui::CaptionStyle> style;
// Apply native CaptionStyle parameters.
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
::switches::kForceCaptionStyle)) {
style = ui::CaptionStyle::FromSpec(
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kForceCaptionStyle));
}
// Apply system caption style.
if (!style) {
ui::NativeTheme* native_theme = ui::NativeTheme::GetInstanceForWeb();
style = native_theme->GetSystemCaptionStyle();
if (record_metrics && style.has_value()) {
base::UmaHistogramBoolean(
"Accessibility.CaptionSettingsLoadedFromSystemSettings",
!IsDefaultStyle(style));
}
}
// Apply caption style from preferences if system caption style is undefined.
if (!style) {
style = GetCaptionStyleFromPrefs(prefs);
if (record_metrics && style.has_value()) {
base::UmaHistogramBoolean("Accessibility.CaptionSettingsLoadedFromPrefs",
!IsDefaultStyle(style));
}
}
return style;
}
bool IsLiveCaptionFeatureSupported() {
if (!base::FeatureList::IsEnabled(media::kLiveCaption))
return false;
// Some Chrome OS devices do not support on-device speech.
#if BUILDFLAG(IS_CHROMEOS_ASH)
if (!base::FeatureList::IsEnabled(ash::features::kOnDeviceSpeechRecognition))
return false;
#elif BUILDFLAG(IS_CHROMEOS_LACROS)
if (!chromeos::LacrosService::Get()
->init_params()
->is_ondevice_speech_supported)
return false;
#endif
#if BUILDFLAG(IS_LINUX)
// Check if the CPU has the required instruction set to run the Speech
// On-Device API (SODA) library.
static bool has_sse41 = base::CPU().has_sse41();
if (!has_sse41)
return false;
#endif
#if BUILDFLAG(IS_WIN) && defined(ARCH_CPU_ARM64)
// The Speech On-Device API (SODA) component does not support Windows on
// arm64.
return false;
#elif BUILDFLAG(IS_CHROMEOS_LACROS)
// Disable Live Caption on LaCrOS. The feature has not been migrated there
// yet, and currently fails rather gracelessly (opening a non-existent .so).
// TODO(b/223493879): Remove this once it fails more gracefully.
return false;
#else
return true;
#endif
}
} // namespace captions
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