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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/win/dark_mode_support.h"
#include <windows.h>
#include "base/check.h"
#include "base/native_library.h"
#include "base/win/win_util.h"
#include "base/win/windows_version.h"
namespace {
// APIs for controlling how an app and window respond to system-level
// dark/light modes.
// Available on Wwindows build base::win::Version::WIN10_19H1 and up.
enum class PreferredAppMode {
kDefault,
kAllowDark,
kForceDark,
kForceLight,
kMax
};
// The following APIs and code was based on information from here:
// https://github.com/ysc3839/win32-darkmode
// Only available on Windows build base::win::Version::WIN10_RS5.
// NOLINTNEXTLINE(readability/casting)
using UxThemeAllowDarkModeForAppFunc = bool(WINAPI*)(bool allow);
// Available on Windows build base::win::Version::WIN10_19H1 and up.
using UxThemeSetPreferredAppModeFunc =
// NOLINTNEXTLINE(readability/casting)
PreferredAppMode(WINAPI*)(PreferredAppMode app_mode);
// Available on Windows build base::win::Version::WIN10_RS5 and up.
// NOLINTNEXTLINE(readability/casting)
using UxThemeAllowDarkModeForWindowFunc = bool(WINAPI*)(HWND hwnd, bool allow);
// The following two ordinals are mutually exclusive and represent a difference
// between base::win::Version::WIN10_RS5 and base::win::Version::WIN10_19H1.
constexpr WORD kUxThemeAllowDarkModeForAppOrdinal = 135;
constexpr WORD kUxThemeSetPreferredAppModeOrdinal = 135;
constexpr WORD kUxThemeAllowDarkModeForWindowOrdinal = 133;
struct DarkModeSupport {
UxThemeAllowDarkModeForAppFunc allow_dark_mode_for_app = nullptr;
UxThemeSetPreferredAppModeFunc set_preferred_app_mode = nullptr;
UxThemeAllowDarkModeForWindowFunc allow_dark_mode_for_window = nullptr;
};
const DarkModeSupport& GetDarkModeSupport() {
static const DarkModeSupport dark_mode_support = [] {
DarkModeSupport dark_mode_support;
auto* os_info = base::win::OSInfo::GetInstance();
// Dark mode only works on WIN10_RS5 and up. uxtheme.dll depends on
// GDI32.dll which is not available under win32k lockdown sandbox.
if (os_info->version() >= base::win::Version::WIN10_RS5 &&
base::win::IsUser32AndGdi32Available()) {
base::NativeLibraryLoadError error;
HMODULE ux_theme_lib = base::PinSystemLibrary(L"uxtheme.dll", &error);
DCHECK(!error.code);
if (os_info->version() >= base::win::Version::WIN10_19H1) {
dark_mode_support.set_preferred_app_mode =
reinterpret_cast<UxThemeSetPreferredAppModeFunc>(::GetProcAddress(
ux_theme_lib,
MAKEINTRESOURCEA(kUxThemeSetPreferredAppModeOrdinal)));
} else {
dark_mode_support.allow_dark_mode_for_app =
reinterpret_cast<UxThemeAllowDarkModeForAppFunc>(::GetProcAddress(
ux_theme_lib,
MAKEINTRESOURCEA(kUxThemeAllowDarkModeForAppOrdinal)));
}
dark_mode_support.allow_dark_mode_for_window =
reinterpret_cast<UxThemeAllowDarkModeForWindowFunc>(::GetProcAddress(
ux_theme_lib,
MAKEINTRESOURCEA(kUxThemeAllowDarkModeForWindowOrdinal)));
}
return dark_mode_support;
}();
return dark_mode_support;
}
} // namespace
namespace base::win {
bool IsDarkModeAvailable() {
auto& dark_mode_support = GetDarkModeSupport();
return (dark_mode_support.allow_dark_mode_for_app ||
dark_mode_support.set_preferred_app_mode) &&
dark_mode_support.allow_dark_mode_for_window;
}
void AllowDarkModeForApp(bool allow) {
if (!IsDarkModeAvailable()) {
return;
}
auto& dark_mode_support = GetDarkModeSupport();
if (dark_mode_support.set_preferred_app_mode) {
dark_mode_support.set_preferred_app_mode(
allow ? PreferredAppMode::kAllowDark : PreferredAppMode::kDefault);
} else {
dark_mode_support.allow_dark_mode_for_app(allow);
}
}
bool AllowDarkModeForWindow(HWND hwnd, bool allow) {
if (!IsDarkModeAvailable()) {
return false;
}
return GetDarkModeSupport().allow_dark_mode_for_window(hwnd, allow);
}
} // namespace base::win
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