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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "nsLookAndFeel.h"
#include <stdint.h>
#include <windows.h>
#include <shellapi.h>
#include "nsStyleConsts.h"
#include "nsUXThemeData.h"
#include "nsUXThemeConstants.h"
#include "nsWindowsHelpers.h"
#include "WinUtils.h"
#include "WindowsUIUtils.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/Telemetry.h"
#include "mozilla/widget/WinRegistry.h"
using namespace mozilla;
using namespace mozilla::widget;
static Maybe<nscolor> GetColorFromTheme(nsUXThemeClass cls, int32_t aPart,
int32_t aState, int32_t aPropId) {
COLORREF color;
HRESULT hr = GetThemeColor(nsUXThemeData::GetTheme(cls), aPart, aState,
aPropId, &color);
if (hr == S_OK) {
return Some(COLOREF_2_NSRGB(color));
}
return Nothing();
}
static int32_t GetSystemParam(long flag, int32_t def) {
DWORD value;
return ::SystemParametersInfo(flag, 0, &value, 0) ? value : def;
}
static int32_t GetTooltipOffsetVertical() {
static constexpr DWORD kDefaultCursorSize = 32;
const DWORD cursorSize =
GetSystemParam(MOZ_SPI_CURSORSIZE, kDefaultCursorSize);
if (cursorSize == kDefaultCursorSize) {
return LookAndFeel::kDefaultTooltipOffset;
}
return std::ceilf(float(LookAndFeel::kDefaultTooltipOffset) *
float(cursorSize) / float(kDefaultCursorSize));
}
static bool SystemWantsDarkTheme() {
if (nsUXThemeData::IsHighContrastOn()) {
return LookAndFeel::IsDarkColor(
LookAndFeel::Color(StyleSystemColor::Window, ColorScheme::Light,
LookAndFeel::UseStandins::No));
}
WinRegistry::Key key(
HKEY_CURRENT_USER,
u"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize"_ns,
WinRegistry::KeyMode::QueryValue);
if (NS_WARN_IF(!key)) {
return false;
}
uint32_t light = key.GetValueAsDword(u"AppsUseLightTheme"_ns).valueOr(1);
return !light;
}
uint32_t nsLookAndFeel::SystemColorFilter() {
if (NS_WARN_IF(!mColorFilterWatcher)) {
return 0;
}
const auto& key = mColorFilterWatcher->GetKey();
if (!key.GetValueAsDword(u"Active"_ns).valueOr(0)) {
return 0;
}
return key.GetValueAsDword(u"FilterType"_ns).valueOr(0);
}
nsLookAndFeel::nsLookAndFeel() {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::TOUCH_ENABLED_DEVICE,
WinUtils::IsTouchDeviceSupportPresent());
}
nsLookAndFeel::~nsLookAndFeel() = default;
void nsLookAndFeel::NativeInit() { EnsureInit(); }
/* virtual */
void nsLookAndFeel::RefreshImpl() {
mInitialized = false; // Fetch system colors next time they're used.
nsXPLookAndFeel::RefreshImpl();
}
static bool UseNonNativeMenuColors(ColorScheme aScheme) {
return !LookAndFeel::GetInt(LookAndFeel::IntID::UseAccessibilityTheme) ||
aScheme == ColorScheme::Dark;
}
nsresult nsLookAndFeel::NativeGetColor(ColorID aID, ColorScheme aScheme,
nscolor& aColor) {
EnsureInit();
auto IsHighlightColor = [&] {
switch (aID) {
case ColorID::MozMenuhover:
return !UseNonNativeMenuColors(aScheme);
case ColorID::Highlight:
case ColorID::Selecteditem:
// We prefer the generic dark selection color if we don't have an
// explicit one.
return aScheme != ColorScheme::Dark || mDarkHighlight;
case ColorID::IMESelectedRawTextBackground:
case ColorID::IMESelectedConvertedTextBackground:
return true;
default:
return false;
}
};
auto IsHighlightTextColor = [&] {
switch (aID) {
case ColorID::MozMenubarhovertext:
if (UseNonNativeMenuColors(aScheme)) {
return false;
}
[[fallthrough]];
case ColorID::MozMenuhovertext:
if (UseNonNativeMenuColors(aScheme)) {
return false;
}
return !mColorMenuHoverText;
case ColorID::Highlighttext:
case ColorID::Selecteditemtext:
// We prefer the generic dark selection color if we don't have an
// explicit one.
return aScheme != ColorScheme::Dark || mDarkHighlightText;
case ColorID::IMESelectedRawTextForeground:
case ColorID::IMESelectedConvertedTextForeground:
return true;
default:
return false;
}
};
if (IsHighlightColor()) {
if (aScheme == ColorScheme::Dark && mDarkHighlight) {
aColor = *mDarkHighlight;
} else {
aColor = GetColorForSysColorIndex(COLOR_HIGHLIGHT);
}
return NS_OK;
}
if (IsHighlightTextColor()) {
if (aScheme == ColorScheme::Dark && mDarkHighlightText) {
aColor = *mDarkHighlightText;
} else {
aColor = GetColorForSysColorIndex(COLOR_HIGHLIGHTTEXT);
}
return NS_OK;
}
// Titlebar colors are color-scheme aware.
switch (aID) {
case ColorID::Activecaption:
aColor = mTitlebarColors.Get(aScheme, true).mBg;
return NS_OK;
case ColorID::Captiontext:
aColor = mTitlebarColors.Get(aScheme, true).mFg;
return NS_OK;
case ColorID::Activeborder:
aColor = mTitlebarColors.Get(aScheme, true).mBorder;
return NS_OK;
case ColorID::Inactivecaption:
aColor = mTitlebarColors.Get(aScheme, false).mBg;
return NS_OK;
case ColorID::Inactivecaptiontext:
aColor = mTitlebarColors.Get(aScheme, false).mFg;
return NS_OK;
case ColorID::Inactiveborder:
aColor = mTitlebarColors.Get(aScheme, false).mBorder;
return NS_OK;
default:
break;
}
if (aScheme == ColorScheme::Dark) {
if (auto color = GenericDarkColor(aID)) {
aColor = *color;
return NS_OK;
}
}
static constexpr auto kNonNativeMenuText = NS_RGB(0x15, 0x14, 0x1a);
nsresult res = NS_OK;
int idx;
switch (aID) {
case ColorID::IMERawInputBackground:
case ColorID::IMEConvertedTextBackground:
aColor = NS_TRANSPARENT;
return NS_OK;
case ColorID::IMERawInputForeground:
case ColorID::IMEConvertedTextForeground:
aColor = NS_SAME_AS_FOREGROUND_COLOR;
return NS_OK;
case ColorID::IMERawInputUnderline:
case ColorID::IMEConvertedTextUnderline:
aColor = NS_SAME_AS_FOREGROUND_COLOR;
return NS_OK;
case ColorID::IMESelectedRawTextUnderline:
case ColorID::IMESelectedConvertedTextUnderline:
aColor = NS_TRANSPARENT;
return NS_OK;
// New CSS 2 Color definitions
case ColorID::Appworkspace:
idx = COLOR_APPWORKSPACE;
break;
case ColorID::Background:
idx = COLOR_BACKGROUND;
break;
case ColorID::Buttonface:
case ColorID::MozButtonhoverface:
case ColorID::MozButtonactiveface:
case ColorID::MozButtondisabledface:
case ColorID::MozColheader:
case ColorID::MozColheaderhover:
case ColorID::MozColheaderactive:
idx = COLOR_BTNFACE;
break;
case ColorID::Buttonhighlight:
idx = COLOR_BTNHIGHLIGHT;
break;
case ColorID::Buttonshadow:
idx = COLOR_BTNSHADOW;
break;
case ColorID::Buttontext:
case ColorID::MozButtonhovertext:
case ColorID::MozButtonactivetext:
idx = COLOR_BTNTEXT;
break;
case ColorID::MozCellhighlighttext:
aColor = NS_RGB(0, 0, 0);
return NS_OK;
case ColorID::MozCellhighlight:
aColor = NS_RGB(206, 206, 206);
return NS_OK;
case ColorID::Graytext:
idx = COLOR_GRAYTEXT;
break;
case ColorID::MozMenubarhovertext:
if (UseNonNativeMenuColors(aScheme)) {
aColor = kNonNativeMenuText;
return NS_OK;
}
[[fallthrough]];
case ColorID::MozMenuhovertext:
if (UseNonNativeMenuColors(aScheme)) {
aColor = kNonNativeMenuText;
return NS_OK;
}
if (mColorMenuHoverText) {
aColor = *mColorMenuHoverText;
return NS_OK;
}
idx = COLOR_HIGHLIGHTTEXT;
break;
case ColorID::MozMenuhover:
MOZ_ASSERT(UseNonNativeMenuColors(aScheme));
aColor = NS_RGB(0xe0, 0xe0, 0xe6);
return NS_OK;
case ColorID::MozMenuhoverdisabled:
if (UseNonNativeMenuColors(aScheme)) {
aColor = NS_RGB(0xf0, 0xf0, 0xf3);
return NS_OK;
}
aColor = NS_TRANSPARENT;
return NS_OK;
case ColorID::Infobackground:
idx = COLOR_INFOBK;
break;
case ColorID::Infotext:
idx = COLOR_INFOTEXT;
break;
case ColorID::Menu:
if (UseNonNativeMenuColors(aScheme)) {
aColor = NS_RGB(0xf9, 0xf9, 0xfb);
return NS_OK;
}
idx = COLOR_MENU;
break;
case ColorID::Menutext:
if (UseNonNativeMenuColors(aScheme)) {
aColor = kNonNativeMenuText;
return NS_OK;
}
idx = COLOR_MENUTEXT;
break;
case ColorID::Scrollbar:
idx = COLOR_SCROLLBAR;
break;
case ColorID::Threeddarkshadow:
idx = COLOR_3DDKSHADOW;
break;
case ColorID::Threedface:
idx = COLOR_3DFACE;
break;
case ColorID::Threedhighlight:
idx = COLOR_3DHIGHLIGHT;
break;
case ColorID::Threedlightshadow:
case ColorID::Buttonborder:
case ColorID::MozDisabledfield:
case ColorID::MozSidebarborder:
idx = COLOR_3DLIGHT;
break;
case ColorID::Threedshadow:
idx = COLOR_3DSHADOW;
break;
case ColorID::Window:
idx = COLOR_WINDOW;
break;
case ColorID::Windowframe:
idx = COLOR_WINDOWFRAME;
break;
case ColorID::Windowtext:
idx = COLOR_WINDOWTEXT;
break;
case ColorID::MozEventreerow:
case ColorID::MozOddtreerow:
case ColorID::Field:
case ColorID::MozSidebar:
case ColorID::MozCombobox:
idx = COLOR_WINDOW;
break;
case ColorID::Fieldtext:
case ColorID::MozSidebartext:
case ColorID::MozComboboxtext:
idx = COLOR_WINDOWTEXT;
break;
case ColorID::MozHeaderbar:
case ColorID::MozHeaderbarinactive:
case ColorID::MozDialog:
idx = COLOR_3DFACE;
break;
case ColorID::Accentcolor:
aColor = mColorAccent;
return NS_OK;
case ColorID::Accentcolortext:
aColor = mColorAccentText;
return NS_OK;
case ColorID::MozHeaderbartext:
case ColorID::MozHeaderbarinactivetext:
case ColorID::MozDialogtext:
case ColorID::MozColheadertext:
case ColorID::MozColheaderhovertext:
case ColorID::MozColheaderactivetext:
idx = COLOR_WINDOWTEXT;
break;
case ColorID::MozNativehyperlinktext:
idx = COLOR_HOTLIGHT;
break;
case ColorID::Marktext:
case ColorID::Mark:
case ColorID::SpellCheckerUnderline:
aColor = GetStandinForNativeColor(aID, aScheme);
return NS_OK;
default:
idx = COLOR_WINDOW;
res = NS_ERROR_FAILURE;
break;
}
aColor = GetColorForSysColorIndex(idx);
return res;
}
nsresult nsLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
EnsureInit();
nsresult res = NS_OK;
switch (aID) {
case IntID::ScrollButtonLeftMouseButtonAction:
aResult = 0;
break;
case IntID::ScrollButtonMiddleMouseButtonAction:
case IntID::ScrollButtonRightMouseButtonAction:
aResult = 3;
break;
case IntID::CaretBlinkTime:
aResult = static_cast<int32_t>(::GetCaretBlinkTime());
break;
case IntID::CaretBlinkCount: {
int32_t timeout = GetSystemParam(SPI_GETCARETTIMEOUT, 5000);
auto blinkTime = ::GetCaretBlinkTime();
if (timeout <= 0 || blinkTime <= 0) {
aResult = -1;
break;
}
// 2 * blinkTime because this integer is a full blink cycle.
aResult = std::ceil(float(timeout) / (2.0f * float(blinkTime)));
break;
}
case IntID::CaretWidth:
aResult = 1;
break;
case IntID::SelectTextfieldsOnKeyFocus:
// Select textfield content when focused by kbd
// used by EventStateManager::sTextfieldSelectModel
aResult = 1;
break;
case IntID::SubmenuDelay:
// This will default to the Windows' default
// (400ms) on error.
aResult = GetSystemParam(SPI_GETMENUSHOWDELAY, 400);
break;
case IntID::MenusCanOverlapOSBar:
// we want XUL popups to be able to overlap the task bar.
aResult = 1;
break;
case IntID::DragThresholdX:
// The system metric is the number of pixels at which a drag should
// start. Our look and feel metric is the number of pixels you can
// move before starting a drag, so subtract 1.
aResult = ::GetSystemMetrics(SM_CXDRAG) - 1;
break;
case IntID::DragThresholdY:
aResult = ::GetSystemMetrics(SM_CYDRAG) - 1;
break;
case IntID::UseAccessibilityTheme:
// High contrast is a misnomer under Win32 -- any theme can be used with
// it, e.g. normal contrast with large fonts, low contrast, etc. The high
// contrast flag really means -- use this theme and don't override it.
aResult = nsUXThemeData::IsHighContrastOn();
break;
case IntID::ScrollArrowStyle:
aResult = eScrollArrowStyle_Single;
break;
case IntID::TreeOpenDelay:
aResult = 1000;
break;
case IntID::TreeCloseDelay:
aResult = 0;
break;
case IntID::TreeLazyScrollDelay:
aResult = 150;
break;
case IntID::TreeScrollDelay:
aResult = 100;
break;
case IntID::TreeScrollLinesMax:
aResult = 3;
break;
case IntID::WindowsAccentColorInTitlebar: {
aResult = mTitlebarColors.mUseAccent;
} break;
case IntID::AlertNotificationOrigin:
aResult = 0;
{
// Get task bar window handle
HWND shellWindow = FindWindowW(L"Shell_TrayWnd", nullptr);
if (shellWindow != nullptr) {
// Determine position
APPBARDATA appBarData;
appBarData.hWnd = shellWindow;
appBarData.cbSize = sizeof(appBarData);
if (SHAppBarMessage(ABM_GETTASKBARPOS, &appBarData)) {
// Set alert origin as a bit field - see LookAndFeel.h
// 0 represents bottom right, sliding vertically.
switch (appBarData.uEdge) {
case ABE_LEFT:
aResult = NS_ALERT_HORIZONTAL | NS_ALERT_LEFT;
break;
case ABE_RIGHT:
aResult = NS_ALERT_HORIZONTAL;
break;
case ABE_TOP:
aResult = NS_ALERT_TOP;
[[fallthrough]];
case ABE_BOTTOM:
// If the task bar is right-to-left,
// move the origin to the left
if (::GetWindowLong(shellWindow, GWL_EXSTYLE) & WS_EX_LAYOUTRTL)
aResult |= NS_ALERT_LEFT;
break;
}
}
}
}
break;
case IntID::IMERawInputUnderlineStyle:
case IntID::IMEConvertedTextUnderlineStyle:
aResult = static_cast<int32_t>(StyleTextDecorationStyle::Dashed);
break;
case IntID::IMESelectedRawTextUnderlineStyle:
case IntID::IMESelectedConvertedTextUnderline:
aResult = static_cast<int32_t>(StyleTextDecorationStyle::None);
break;
case IntID::SpellCheckerUnderlineStyle:
aResult = static_cast<int32_t>(StyleTextDecorationStyle::Wavy);
break;
case IntID::ScrollbarButtonAutoRepeatBehavior:
aResult = 0;
break;
case IntID::SwipeAnimationEnabled:
// Forcibly enable the swipe animation on Windows. It doesn't matter on
// platforms where "Drag two fingers to scroll" isn't supported since on
// the platforms we will never generate any swipe gesture events.
aResult = 1;
break;
case IntID::UseOverlayScrollbars:
aResult = WindowsUIUtils::ComputeOverlayScrollbars();
break;
case IntID::AllowOverlayScrollbarsOverlap:
aResult = 0;
break;
case IntID::ScrollbarDisplayOnMouseMove:
aResult = 1;
break;
case IntID::ScrollbarFadeBeginDelay:
aResult = 2500;
break;
case IntID::ScrollbarFadeDuration:
aResult = 350;
break;
case IntID::ContextMenuOffsetVertical:
case IntID::ContextMenuOffsetHorizontal:
aResult = 2;
break;
case IntID::TooltipOffsetVertical:
aResult = GetTooltipOffsetVertical();
break;
case IntID::SystemUsesDarkTheme:
aResult = SystemWantsDarkTheme();
break;
case IntID::SystemScrollbarSize:
aResult = std::max(WinUtils::GetSystemMetricsForDpi(SM_CXVSCROLL, 96),
WinUtils::GetSystemMetricsForDpi(SM_CXHSCROLL, 96));
break;
case IntID::PrefersReducedMotion: {
BOOL enable = TRUE;
::SystemParametersInfoW(SPI_GETCLIENTAREAANIMATION, 0, &enable, 0);
aResult = !enable;
break;
}
case IntID::PrefersReducedTransparency: {
// Prefers reduced transparency if the option for "Transparency Effects"
// is disabled
aResult = !WindowsUIUtils::ComputeTransparencyEffects();
break;
}
case IntID::InvertedColors: {
// Color filter values
// 1: Inverted
// 2: Grayscale inverted
aResult = mCurrentColorFilter == 1 || mCurrentColorFilter == 2;
break;
}
case IntID::PrimaryPointerCapabilities: {
aResult = static_cast<int32_t>(
widget::WinUtils::GetPrimaryPointerCapabilities());
break;
}
case IntID::AllPointerCapabilities: {
aResult =
static_cast<int32_t>(widget::WinUtils::GetAllPointerCapabilities());
break;
}
case IntID::TouchDeviceSupportPresent:
aResult = !!WinUtils::IsTouchDeviceSupportPresent();
break;
case IntID::PanelAnimations:
aResult = 1;
break;
case IntID::HideCursorWhileTyping: {
BOOL enable = TRUE;
::SystemParametersInfoW(SPI_GETMOUSEVANISH, 0, &enable, 0);
aResult = enable;
break;
}
default:
aResult = 0;
res = NS_ERROR_FAILURE;
}
return res;
}
nsresult nsLookAndFeel::NativeGetFloat(FloatID aID, float& aResult) {
nsresult res = NS_OK;
switch (aID) {
case FloatID::IMEUnderlineRelativeSize:
aResult = 1.0f;
break;
case FloatID::SpellCheckerUnderlineRelativeSize:
aResult = 1.0f;
break;
case FloatID::TextScaleFactor:
aResult = WindowsUIUtils::ComputeTextScaleFactor();
break;
default:
aResult = -1.0;
res = NS_ERROR_FAILURE;
}
return res;
}
LookAndFeelFont nsLookAndFeel::GetLookAndFeelFontInternal(
const LOGFONTW& aLogFont, bool aUseShellDlg) {
LookAndFeelFont result{};
result.haveFont() = false;
// Get scaling factor from physical to logical pixels
double pixelScale =
1.0 / WinUtils::SystemScaleFactor() / LookAndFeel::GetTextScaleFactor();
// The lfHeight is in pixels, and it needs to be adjusted for the
// device it will be displayed on.
// Screens and Printers will differ in DPI
//
// So this accounts for the difference in the DeviceContexts
// The pixelScale will typically be 1.0 for the screen
// (though larger for hi-dpi screens where the Windows resolution
// scale factor is 125% or 150% or even more), and could be
// any value when going to a printer, for example pixelScale is
// 6.25 when going to a 600dpi printer.
float pixelHeight = -aLogFont.lfHeight;
if (pixelHeight < 0) {
nsAutoFont hFont(::CreateFontIndirectW(&aLogFont));
if (!hFont) {
return result;
}
nsAutoHDC dc(::GetDC(nullptr));
HGDIOBJ hObject = ::SelectObject(dc, hFont);
TEXTMETRIC tm;
::GetTextMetrics(dc, &tm);
::SelectObject(dc, hObject);
pixelHeight = tm.tmAscent;
}
pixelHeight *= pixelScale;
// we have problem on Simplified Chinese system because the system
// report the default font size is 8 points. but if we use 8, the text
// display very ugly. force it to be at 9 points (12 pixels) on that
// system (cp936), but leave other sizes alone.
if (pixelHeight < 12 && ::GetACP() == 936) {
pixelHeight = 12;
}
result.haveFont() = true;
if (aUseShellDlg) {
result.name() = u"MS Shell Dlg 2"_ns;
} else {
result.name() = aLogFont.lfFaceName;
}
result.size() = pixelHeight;
result.italic() = !!aLogFont.lfItalic;
// FIXME: Other weights?
result.weight() =
((aLogFont.lfWeight == FW_BOLD) ? FontWeight::BOLD : FontWeight::NORMAL)
.ToFloat();
return result;
}
LookAndFeelFont nsLookAndFeel::GetLookAndFeelFont(LookAndFeel::FontID anID) {
LookAndFeelFont result{};
result.haveFont() = false;
// FontID::Icon is handled differently than the others
if (anID == LookAndFeel::FontID::Icon) {
LOGFONTW logFont;
if (::SystemParametersInfoW(SPI_GETICONTITLELOGFONT, sizeof(logFont),
(PVOID)&logFont, 0)) {
result = GetLookAndFeelFontInternal(logFont, false);
}
return result;
}
NONCLIENTMETRICSW ncm;
ncm.cbSize = sizeof(NONCLIENTMETRICSW);
if (!::SystemParametersInfoW(SPI_GETNONCLIENTMETRICS, sizeof(ncm),
(PVOID)&ncm, 0)) {
return result;
}
switch (anID) {
case LookAndFeel::FontID::Menu:
case LookAndFeel::FontID::MozPullDownMenu:
result = GetLookAndFeelFontInternal(ncm.lfMenuFont, false);
break;
case LookAndFeel::FontID::Caption:
result = GetLookAndFeelFontInternal(ncm.lfCaptionFont, false);
break;
case LookAndFeel::FontID::SmallCaption:
result = GetLookAndFeelFontInternal(ncm.lfSmCaptionFont, false);
break;
case LookAndFeel::FontID::StatusBar:
result = GetLookAndFeelFontInternal(ncm.lfStatusFont, false);
break;
case LookAndFeel::FontID::MozButton:
case LookAndFeel::FontID::MozField:
case LookAndFeel::FontID::MozList:
// XXX It's not clear to me whether this is exactly the right
// set of LookAndFeel values to map to the dialog font; we may
// want to add or remove cases here after reviewing the visual
// results under various Windows versions.
result = GetLookAndFeelFontInternal(ncm.lfMessageFont, true);
break;
default:
result = GetLookAndFeelFontInternal(ncm.lfMessageFont, false);
break;
}
return result;
}
bool nsLookAndFeel::NativeGetFont(LookAndFeel::FontID anID, nsString& aFontName,
gfxFontStyle& aFontStyle) {
LookAndFeelFont font = GetLookAndFeelFont(anID);
return LookAndFeelFontToStyle(font, aFontName, aFontStyle);
}
/* virtual */
char16_t nsLookAndFeel::GetPasswordCharacterImpl() {
#define UNICODE_BLACK_CIRCLE_CHAR 0x25cf
return UNICODE_BLACK_CIRCLE_CHAR;
}
static nscolor GetAccentColorText(const nscolor aAccentColor) {
// We want the color that we return for text that will be drawn over
// a background that has the accent color to have good contrast with
// the accent color. Windows itself uses either white or black text
// depending on how light or dark the accent color is. We do the same
// here based on the luminance of the accent color with a threshhold
// value. This algorithm should match what Windows does. It comes from:
//
float luminance = (NS_GET_R(aAccentColor) * 2 + NS_GET_G(aAccentColor) * 5 +
NS_GET_B(aAccentColor)) /
8;
return luminance <= 128 ? NS_RGB(255, 255, 255) : NS_RGB(0, 0, 0);
}
static Maybe<nscolor> GetAccentColorText(const Maybe<nscolor>& aAccentColor) {
if (!aAccentColor) {
return Nothing();
}
return Some(GetAccentColorText(*aAccentColor));
}
nscolor nsLookAndFeel::GetColorForSysColorIndex(int index) {
MOZ_ASSERT(index >= SYS_COLOR_MIN && index <= SYS_COLOR_MAX);
return mSysColorTable[index - SYS_COLOR_MIN];
}
auto nsLookAndFeel::ComputeTitlebarColors() -> TitlebarColors {
TitlebarColors result;
// Start with the native / non-accent-in-titlebar colors.
result.mActiveLight = {GetColorForSysColorIndex(COLOR_ACTIVECAPTION),
GetColorForSysColorIndex(COLOR_CAPTIONTEXT),
GetColorForSysColorIndex(COLOR_ACTIVEBORDER)};
result.mInactiveLight = {GetColorForSysColorIndex(COLOR_INACTIVECAPTION),
GetColorForSysColorIndex(COLOR_INACTIVECAPTIONTEXT),
GetColorForSysColorIndex(COLOR_INACTIVEBORDER)};
if (!nsUXThemeData::IsHighContrastOn()) {
// Use our non-native colors.
result.mActiveLight = {
GetStandinForNativeColor(ColorID::Activecaption, ColorScheme::Light),
GetStandinForNativeColor(ColorID::Captiontext, ColorScheme::Light),
GetStandinForNativeColor(ColorID::Activeborder, ColorScheme::Light)};
result.mInactiveLight = {
GetStandinForNativeColor(ColorID::Inactivecaption, ColorScheme::Light),
GetStandinForNativeColor(ColorID::Inactivecaptiontext,
ColorScheme::Light),
GetStandinForNativeColor(ColorID::Inactiveborder, ColorScheme::Light)};
}
// Our dark colors are always non-native.
result.mActiveDark = {*GenericDarkColor(ColorID::Activecaption),
*GenericDarkColor(ColorID::Captiontext),
*GenericDarkColor(ColorID::Activeborder)};
result.mInactiveDark = {*GenericDarkColor(ColorID::Inactivecaption),
*GenericDarkColor(ColorID::Inactivecaptiontext),
*GenericDarkColor(ColorID::Inactiveborder)};
// sys color notification is enough.
WinRegistry::Key dwmKey(HKEY_CURRENT_USER,
u"SOFTWARE\\Microsoft\\Windows\\DWM"_ns,
WinRegistry::KeyMode::QueryValue);
if (NS_WARN_IF(!dwmKey)) {
return result;
}
// The order of the color components in the DWORD stored in the registry
// happens to be the same order as we store the components in nscolor
// so we can just assign directly here.
result.mAccent = dwmKey.GetValueAsDword(u"AccentColor"_ns);
result.mAccentText = GetAccentColorText(result.mAccent);
if (!result.mAccent) {
return result;
}
result.mAccentInactive = dwmKey.GetValueAsDword(u"AccentColorInactive"_ns);
result.mAccentInactiveText = GetAccentColorText(result.mAccentInactive);
// The ColorPrevalence value is set to 1 when the "Show color on title bar"
// setting in the Color section of Window's Personalization settings is
// turned on.
result.mUseAccent =
dwmKey.GetValueAsDword(u"ColorPrevalence"_ns).valueOr(0) == 1;
if (!result.mUseAccent) {
return result;
}
// TODO(emilio): Consider reading ColorizationColorBalance to compute a
// more correct border color, see [1]. Though for opaque accent colors this
// isn't needed.
//
// [1]:
result.mActiveDark.mBorder = result.mActiveLight.mBorder = *result.mAccent;
result.mInactiveDark.mBorder = result.mInactiveLight.mBorder =
result.mAccentInactive.valueOr(NS_RGB(57, 57, 57));
result.mActiveLight.mBg = result.mActiveDark.mBg = *result.mAccent;
result.mActiveLight.mFg = result.mActiveDark.mFg = *result.mAccentText;
if (result.mAccentInactive) {
result.mInactiveLight.mBg = result.mInactiveDark.mBg =
*result.mAccentInactive;
result.mInactiveLight.mFg = result.mInactiveDark.mFg =
*result.mAccentInactiveText;
} else {
// This is hand-picked to .8 to change the accent color a bit but not too
// much.
constexpr uint8_t kBgAlpha = 208;
const auto BlendWithAlpha = [](nscolor aBg, nscolor aFg,
uint8_t aAlpha) -> nscolor {
return NS_ComposeColors(
aBg, NS_RGBA(NS_GET_R(aFg), NS_GET_G(aFg), NS_GET_B(aFg), aAlpha));
};
result.mInactiveLight.mBg =
BlendWithAlpha(NS_RGB(255, 255, 255), *result.mAccent, kBgAlpha);
result.mInactiveDark.mBg =
BlendWithAlpha(NS_RGB(0, 0, 0), *result.mAccent, kBgAlpha);
result.mInactiveLight.mFg = result.mInactiveDark.mFg = *result.mAccentText;
}
return result;
}
void nsLookAndFeel::EnsureInit() {
if (mInitialized) {
return;
}
mInitialized = true;
mColorMenuHoverText =
::GetColorFromTheme(eUXMenu, MENU_POPUPITEM, MPI_HOT, TMT_TEXTCOLOR);
// Fill out the sys color table.
for (int i = SYS_COLOR_MIN; i <= SYS_COLOR_MAX; ++i) {
mSysColorTable[i - SYS_COLOR_MIN] = [&] {
if (auto c = WindowsUIUtils::GetSystemColor(ColorScheme::Light, i)) {
return *c;
}
DWORD color = ::GetSysColor(i);
return COLOREF_2_NSRGB(color);
}();
}
mDarkHighlight =
WindowsUIUtils::GetSystemColor(ColorScheme::Dark, COLOR_HIGHLIGHT);
mDarkHighlightText =
WindowsUIUtils::GetSystemColor(ColorScheme::Dark, COLOR_HIGHLIGHTTEXT);
mTitlebarColors = ComputeTitlebarColors();
mColorAccent = [&] {
if (auto accent = WindowsUIUtils::GetAccentColor()) {
return *accent;
}
// Try the titlebar accent as a fallback.
if (mTitlebarColors.mAccent) {
return *mTitlebarColors.mAccent;
}
return NS_RGB(0, 120, 215);
}();
mColorAccentText = GetAccentColorText(mColorAccent);
if (!mColorFilterWatcher) {
WinRegistry::Key key(
HKEY_CURRENT_USER, u"Software\\Microsoft\\ColorFiltering"_ns,
WinRegistry::KeyMode::QueryValue | WinRegistry::KeyMode::Notify);
if (key) {
mColorFilterWatcher = MakeUnique<WinRegistry::KeyWatcher>(
std::move(key), GetCurrentSerialEventTarget(), [this] {
MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
if (mCurrentColorFilter != SystemColorFilter()) {
LookAndFeel::NotifyChangedAllWindows(
widget::ThemeChangeKind::MediaQueriesOnly);
}
});
}
}
mCurrentColorFilter = SystemColorFilter();
RecordTelemetry();
}