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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /widget/gtk/nsLookAndFeel.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'widget/gtk/nsLookAndFeel.cpp')
-rw-r--r--widget/gtk/nsLookAndFeel.cpp2329
1 files changed, 2329 insertions, 0 deletions
diff --git a/widget/gtk/nsLookAndFeel.cpp b/widget/gtk/nsLookAndFeel.cpp
new file mode 100644
index 0000000000..c4b430d2eb
--- /dev/null
+++ b/widget/gtk/nsLookAndFeel.cpp
@@ -0,0 +1,2329 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=2:tabstop=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
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// for strtod()
+#include <stdlib.h>
+#include <dlfcn.h>
+
+#include "nsLookAndFeel.h"
+
+#include <gtk/gtk.h>
+#include <gdk/gdk.h>
+
+#include <pango/pango.h>
+#include <pango/pango-fontmap.h>
+#include <fontconfig/fontconfig.h>
+
+#include "GRefPtr.h"
+#include "GUniquePtr.h"
+#include "nsGtkUtils.h"
+#include "gfxPlatformGtk.h"
+#include "mozilla/FontPropertyTypes.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/RelativeLuminanceUtils.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/StaticPrefs_widget.h"
+#include "mozilla/StaticPrefs_browser.h"
+#include "mozilla/AutoRestore.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/WidgetUtilsGtk.h"
+#include "ScreenHelperGTK.h"
+#include "ScrollbarDrawing.h"
+
+#include "gtkdrawing.h"
+#include "nsString.h"
+#include "nsStyleConsts.h"
+#include "gfxFontConstants.h"
+#include "WidgetUtils.h"
+#include "nsWindow.h"
+
+#include "mozilla/gfx/2D.h"
+
+#include <cairo-gobject.h>
+#include <dlfcn.h>
+#include "WidgetStyleCache.h"
+#include "prenv.h"
+#include "nsCSSColorUtils.h"
+#include "mozilla/Preferences.h"
+
+using namespace mozilla;
+using namespace mozilla::widget;
+
+#ifdef MOZ_LOGGING
+# include "mozilla/Logging.h"
+# include "nsTArray.h"
+# include "Units.h"
+static LazyLogModule gLnfLog("LookAndFeel");
+# define LOGLNF(...) MOZ_LOG(gLnfLog, LogLevel::Debug, (__VA_ARGS__))
+# define LOGLNF_ENABLED() MOZ_LOG_TEST(gLnfLog, LogLevel::Debug)
+#else
+# define LOGLNF(args)
+# define LOGLNF_ENABLED() false
+#endif /* MOZ_LOGGING */
+
+#define GDK_COLOR_TO_NS_RGB(c) \
+ ((nscolor)NS_RGB(c.red >> 8, c.green >> 8, c.blue >> 8))
+#define GDK_RGBA_TO_NS_RGBA(c) \
+ ((nscolor)NS_RGBA((int)((c).red * 255), (int)((c).green * 255), \
+ (int)((c).blue * 255), (int)((c).alpha * 255)))
+
+static bool sIgnoreChangedSettings = false;
+
+static void OnSettingsChange() {
+ if (sIgnoreChangedSettings) {
+ return;
+ }
+ // TODO: We could be more granular here, but for now assume everything
+ // changed.
+ LookAndFeel::NotifyChangedAllWindows(widget::ThemeChangeKind::StyleAndLayout);
+ widget::IMContextWrapper::OnThemeChanged();
+}
+
+static void settings_changed_cb(GtkSettings*, GParamSpec*, void*) {
+ OnSettingsChange();
+}
+
+static bool sCSDAvailable;
+
+static nsCString GVariantToString(GVariant* aVariant) {
+ nsCString ret;
+ gchar* s = g_variant_print(aVariant, TRUE);
+ if (s) {
+ ret.Assign(s);
+ g_free(s);
+ }
+ return ret;
+}
+
+static nsDependentCString GVariantGetString(GVariant* aVariant) {
+ gsize len = 0;
+ const gchar* v = g_variant_get_string(aVariant, &len);
+ return nsDependentCString(v, len);
+}
+
+static void settings_changed_signal_cb(GDBusProxy* proxy, gchar* sender_name,
+ gchar* signal_name, GVariant* parameters,
+ gpointer user_data) {
+ LOGLNF("Settings Change sender=%s signal=%s params=%s\n", sender_name,
+ signal_name, GVariantToString(parameters).get());
+ if (strcmp(signal_name, "SettingChanged")) {
+ NS_WARNING("Unknown change signal for settings");
+ return;
+ }
+ RefPtr<GVariant> ns = dont_AddRef(g_variant_get_child_value(parameters, 0));
+ RefPtr<GVariant> key = dont_AddRef(g_variant_get_child_value(parameters, 1));
+ // Third parameter is the value, but we don't care about it.
+ if (!ns || !key || !g_variant_is_of_type(ns, G_VARIANT_TYPE_STRING) ||
+ !g_variant_is_of_type(key, G_VARIANT_TYPE_STRING)) {
+ MOZ_ASSERT(false, "Unexpected setting change signal parameters");
+ return;
+ }
+
+ auto* lnf = static_cast<nsLookAndFeel*>(user_data);
+
+ auto nsStr = GVariantGetString(ns);
+ auto keyStr = GVariantGetString(key);
+ if (nsStr.Equals("org.freedesktop.appearance"_ns) &&
+ keyStr.Equals("color-scheme"_ns)) {
+ lnf->OnColorSchemeSettingChanged();
+ }
+}
+
+void nsLookAndFeel::WatchDBus() {
+ GUniquePtr<GError> error;
+ mDBusSettingsProxy = dont_AddRef(g_dbus_proxy_new_for_bus_sync(
+ G_BUS_TYPE_SESSION, G_DBUS_PROXY_FLAGS_NONE, nullptr,
+ "org.freedesktop.portal.Desktop", "/org/freedesktop/portal/desktop",
+ "org.freedesktop.portal.Settings", nullptr, getter_Transfers(error)));
+ if (mDBusSettingsProxy) {
+ g_signal_connect(mDBusSettingsProxy, "g-signal",
+ G_CALLBACK(settings_changed_signal_cb), this);
+ } else {
+ LOGLNF("Can't create DBus proxy for settings: %s\n", error->message);
+ return;
+ }
+
+ // DBus interface was started after L&F init so we need to load
+ // our settings from DBus explicitly.
+ if (!sIgnoreChangedSettings) {
+ OnColorSchemeSettingChanged();
+ }
+}
+
+void nsLookAndFeel::UnwatchDBus() {
+ if (mDBusSettingsProxy) {
+ g_signal_handlers_disconnect_by_func(
+ mDBusSettingsProxy, FuncToGpointer(settings_changed_signal_cb), this);
+ mDBusSettingsProxy = nullptr;
+ }
+}
+
+nsLookAndFeel::nsLookAndFeel() {
+ static constexpr nsLiteralCString kObservedSettings[] = {
+ // Affects system font sizes.
+ "notify::gtk-xft-dpi"_ns,
+ // Affects mSystemTheme and mAltTheme as expected.
+ "notify::gtk-theme-name"_ns,
+ // System fonts?
+ "notify::gtk-font-name"_ns,
+ // prefers-reduced-motion
+ "notify::gtk-enable-animations"_ns,
+ // CSD media queries, etc.
+ "notify::gtk-decoration-layout"_ns,
+ // Text resolution affects system font and widget sizes.
+ "notify::resolution"_ns,
+ // These three Affect mCaretBlinkTime
+ "notify::gtk-cursor-blink"_ns,
+ "notify::gtk-cursor-blink-time"_ns,
+ "notify::gtk-cursor-blink-timeout"_ns,
+ // Affects SelectTextfieldsOnKeyFocus
+ "notify::gtk-entry-select-on-focus"_ns,
+ // Affects ScrollToClick
+ "notify::gtk-primary-button-warps-slider"_ns,
+ // Affects SubmenuDelay
+ "notify::gtk-menu-popup-delay"_ns,
+ // Affects DragThresholdX/Y
+ "notify::gtk-dnd-drag-threshold"_ns,
+ // Affects titlebar actions loaded at moz_gtk_refresh().
+ "notify::gtk-titlebar-double-click"_ns,
+ "notify::gtk-titlebar-middle-click"_ns,
+ };
+
+ GtkSettings* settings = gtk_settings_get_default();
+ for (const auto& setting : kObservedSettings) {
+ g_signal_connect_after(settings, setting.get(),
+ G_CALLBACK(settings_changed_cb), nullptr);
+ }
+
+ sCSDAvailable =
+ nsWindow::GetSystemGtkWindowDecoration() != nsWindow::GTK_DECORATION_NONE;
+
+ if (ShouldUsePortal(PortalKind::Settings)) {
+ mDBusID = g_bus_watch_name(
+ G_BUS_TYPE_SESSION, "org.freedesktop.portal.Desktop",
+ G_BUS_NAME_WATCHER_FLAGS_AUTO_START,
+ [](GDBusConnection*, const gchar*, const gchar*,
+ gpointer data) -> void {
+ auto* lnf = static_cast<nsLookAndFeel*>(data);
+ lnf->WatchDBus();
+ },
+ [](GDBusConnection*, const gchar*, gpointer data) -> void {
+ auto* lnf = static_cast<nsLookAndFeel*>(data);
+ lnf->UnwatchDBus();
+ },
+ this, nullptr);
+ }
+ if (IsKdeDesktopEnvironment()) {
+ GUniquePtr<gchar> path(
+ g_strconcat(g_get_user_config_dir(), "/gtk-3.0/colors.css", NULL));
+ mKdeColors = dont_AddRef(g_file_new_for_path(path.get()));
+ mKdeColorsMonitor = dont_AddRef(
+ g_file_monitor_file(mKdeColors.get(), G_FILE_MONITOR_NONE, NULL, NULL));
+ if (mKdeColorsMonitor) {
+ g_signal_connect(mKdeColorsMonitor.get(), "changed",
+ G_CALLBACK(settings_changed_cb), NULL);
+ }
+ }
+}
+
+nsLookAndFeel::~nsLookAndFeel() {
+ ClearRoundedCornerProvider();
+ if (mDBusID) {
+ g_bus_unwatch_name(mDBusID);
+ mDBusID = 0;
+ }
+ UnwatchDBus();
+ g_signal_handlers_disconnect_by_func(
+ gtk_settings_get_default(), FuncToGpointer(settings_changed_cb), nullptr);
+}
+
+#if 0
+static void DumpStyleContext(GtkStyleContext* aStyle) {
+ static auto sGtkStyleContextToString =
+ reinterpret_cast<char* (*)(GtkStyleContext*, gint)>(
+ dlsym(RTLD_DEFAULT, "gtk_style_context_to_string"));
+ char* str = sGtkStyleContextToString(aStyle, ~0);
+ printf("%s\n", str);
+ g_free(str);
+ str = gtk_widget_path_to_string(gtk_style_context_get_path(aStyle));
+ printf("%s\n", str);
+ g_free(str);
+}
+#endif
+
+// Modifies color |*aDest| as if a pattern of color |aSource| was painted with
+// CAIRO_OPERATOR_OVER to a surface with color |*aDest|.
+static void ApplyColorOver(const GdkRGBA& aSource, GdkRGBA* aDest) {
+ gdouble sourceCoef = aSource.alpha;
+ gdouble destCoef = aDest->alpha * (1.0 - sourceCoef);
+ gdouble resultAlpha = sourceCoef + destCoef;
+ if (resultAlpha != 0.0) { // don't divide by zero
+ destCoef /= resultAlpha;
+ sourceCoef /= resultAlpha;
+ aDest->red = sourceCoef * aSource.red + destCoef * aDest->red;
+ aDest->green = sourceCoef * aSource.green + destCoef * aDest->green;
+ aDest->blue = sourceCoef * aSource.blue + destCoef * aDest->blue;
+ aDest->alpha = resultAlpha;
+ }
+}
+
+static void GetLightAndDarkness(const GdkRGBA& aColor, double* aLightness,
+ double* aDarkness) {
+ double sum = aColor.red + aColor.green + aColor.blue;
+ *aLightness = sum * aColor.alpha;
+ *aDarkness = (3.0 - sum) * aColor.alpha;
+}
+
+static bool GetGradientColors(const GValue* aValue, GdkRGBA* aLightColor,
+ GdkRGBA* aDarkColor) {
+ if (!G_TYPE_CHECK_VALUE_TYPE(aValue, CAIRO_GOBJECT_TYPE_PATTERN)) {
+ return false;
+ }
+
+ auto pattern = static_cast<cairo_pattern_t*>(g_value_get_boxed(aValue));
+ if (!pattern) {
+ return false;
+ }
+
+ // Just picking the lightest and darkest colors as simple samples rather
+ // than trying to blend, which could get messy if there are many stops.
+ if (CAIRO_STATUS_SUCCESS !=
+ cairo_pattern_get_color_stop_rgba(pattern, 0, nullptr, &aDarkColor->red,
+ &aDarkColor->green, &aDarkColor->blue,
+ &aDarkColor->alpha)) {
+ return false;
+ }
+
+ double maxLightness, maxDarkness;
+ GetLightAndDarkness(*aDarkColor, &maxLightness, &maxDarkness);
+ *aLightColor = *aDarkColor;
+
+ GdkRGBA stop;
+ for (int index = 1;
+ CAIRO_STATUS_SUCCESS ==
+ cairo_pattern_get_color_stop_rgba(pattern, index, nullptr, &stop.red,
+ &stop.green, &stop.blue, &stop.alpha);
+ ++index) {
+ double lightness, darkness;
+ GetLightAndDarkness(stop, &lightness, &darkness);
+ if (lightness > maxLightness) {
+ maxLightness = lightness;
+ *aLightColor = stop;
+ }
+ if (darkness > maxDarkness) {
+ maxDarkness = darkness;
+ *aDarkColor = stop;
+ }
+ }
+
+ return true;
+}
+
+static bool GetColorFromImagePattern(const GValue* aValue, nscolor* aColor) {
+ if (!G_TYPE_CHECK_VALUE_TYPE(aValue, CAIRO_GOBJECT_TYPE_PATTERN)) {
+ return false;
+ }
+
+ auto* pattern = static_cast<cairo_pattern_t*>(g_value_get_boxed(aValue));
+ if (!pattern) {
+ return false;
+ }
+
+ cairo_surface_t* surface;
+ if (cairo_pattern_get_surface(pattern, &surface) != CAIRO_STATUS_SUCCESS) {
+ return false;
+ }
+
+ cairo_format_t format = cairo_image_surface_get_format(surface);
+ if (format == CAIRO_FORMAT_INVALID) {
+ return false;
+ }
+ int width = cairo_image_surface_get_width(surface);
+ int height = cairo_image_surface_get_height(surface);
+ int stride = cairo_image_surface_get_stride(surface);
+ if (!width || !height) {
+ return false;
+ }
+
+ // Guesstimate the central pixel would have a sensible color.
+ int x = width / 2;
+ int y = height / 2;
+
+ unsigned char* data = cairo_image_surface_get_data(surface);
+ switch (format) {
+ // Most (all?) GTK images / patterns / etc use ARGB32.
+ case CAIRO_FORMAT_ARGB32: {
+ size_t offset = x * 4 + y * stride;
+ uint32_t* pixel = reinterpret_cast<uint32_t*>(data + offset);
+ *aColor = gfx::sRGBColor::UnusualFromARGB(*pixel).ToABGR();
+ return true;
+ }
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static bool GetUnicoBorderGradientColors(GtkStyleContext* aContext,
+ GdkRGBA* aLightColor,
+ GdkRGBA* aDarkColor) {
+ // Ubuntu 12.04 has GTK engine Unico-1.0.2, which overrides render_frame,
+ // providing its own border code. Ubuntu 14.04 has
+ // Unico-1.0.3+14.04.20140109, which does not override render_frame, and
+ // so does not need special attention. The earlier Unico can be detected
+ // by the -unico-border-gradient style property it registers.
+ // gtk_style_properties_lookup_property() is checked first to avoid the
+ // warning from gtk_style_context_get_property() when the property does
+ // not exist. (gtk_render_frame() of GTK+ 3.16 no longer uses the
+ // engine.)
+ const char* propertyName = "-unico-border-gradient";
+ if (!gtk_style_properties_lookup_property(propertyName, nullptr, nullptr))
+ return false;
+
+ // -unico-border-gradient is used only when the CSS node's engine is Unico.
+ GtkThemingEngine* engine;
+ GtkStateFlags state = gtk_style_context_get_state(aContext);
+ gtk_style_context_get(aContext, state, "engine", &engine, nullptr);
+ if (strcmp(g_type_name(G_TYPE_FROM_INSTANCE(engine)), "UnicoEngine") != 0)
+ return false;
+
+ // draw_border() of Unico engine uses -unico-border-gradient
+ // in preference to border-color.
+ GValue value = G_VALUE_INIT;
+ gtk_style_context_get_property(aContext, propertyName, state, &value);
+
+ bool result = GetGradientColors(&value, aLightColor, aDarkColor);
+
+ g_value_unset(&value);
+ return result;
+}
+
+// Sets |aLightColor| and |aDarkColor| to colors from |aContext|. Returns
+// true if |aContext| uses these colors to render a visible border.
+// If returning false, then the colors returned are a fallback from the
+// border-color value even though |aContext| does not use these colors to
+// render a border.
+static bool GetBorderColors(GtkStyleContext* aContext, GdkRGBA* aLightColor,
+ GdkRGBA* aDarkColor) {
+ // Determine whether the border on this style context is visible.
+ GtkStateFlags state = gtk_style_context_get_state(aContext);
+ GtkBorderStyle borderStyle;
+ gtk_style_context_get(aContext, state, GTK_STYLE_PROPERTY_BORDER_STYLE,
+ &borderStyle, nullptr);
+ bool visible = borderStyle != GTK_BORDER_STYLE_NONE &&
+ borderStyle != GTK_BORDER_STYLE_HIDDEN;
+ if (visible) {
+ // GTK has an initial value of zero for border-widths, and so themes
+ // need to explicitly set border-widths to make borders visible.
+ GtkBorder border;
+ gtk_style_context_get_border(aContext, state, &border);
+ visible = border.top != 0 || border.right != 0 || border.bottom != 0 ||
+ border.left != 0;
+ }
+
+ if (visible &&
+ GetUnicoBorderGradientColors(aContext, aLightColor, aDarkColor))
+ return true;
+
+ // The initial value for the border-color is the foreground color, and so
+ // this will usually return a color distinct from the background even if
+ // there is no visible border detected.
+ gtk_style_context_get_border_color(aContext, state, aDarkColor);
+ // TODO GTK3 - update aLightColor
+ // for GTK_BORDER_STYLE_INSET/OUTSET/GROVE/RIDGE border styles.
+ // https://bugzilla.mozilla.org/show_bug.cgi?id=978172#c25
+ *aLightColor = *aDarkColor;
+ return visible;
+}
+
+static bool GetBorderColors(GtkStyleContext* aContext, nscolor* aLightColor,
+ nscolor* aDarkColor) {
+ GdkRGBA lightColor, darkColor;
+ bool ret = GetBorderColors(aContext, &lightColor, &darkColor);
+ *aLightColor = GDK_RGBA_TO_NS_RGBA(lightColor);
+ *aDarkColor = GDK_RGBA_TO_NS_RGBA(darkColor);
+ return ret;
+}
+
+// Finds ideal cell highlight colors used for unfocused+selected cells distinct
+// from both Highlight, used as focused+selected background, and the listbox
+// background which is assumed to be similar to -moz-field
+void nsLookAndFeel::PerThemeData::InitCellHighlightColors() {
+ int32_t minLuminosityDifference = NS_SUFFICIENT_LUMINOSITY_DIFFERENCE_BG;
+ int32_t backLuminosityDifference =
+ NS_LUMINOSITY_DIFFERENCE(mWindow.mBg, mField.mBg);
+ if (backLuminosityDifference >= minLuminosityDifference) {
+ mCellHighlight = mWindow;
+ return;
+ }
+
+ uint16_t hue, sat, luminance;
+ uint8_t alpha;
+ mCellHighlight = mField;
+
+ NS_RGB2HSV(mCellHighlight.mBg, hue, sat, luminance, alpha);
+
+ uint16_t step = 30;
+ // Lighten the color if the color is very dark
+ if (luminance <= step) {
+ luminance += step;
+ }
+ // Darken it if it is very light
+ else if (luminance >= 255 - step) {
+ luminance -= step;
+ }
+ // Otherwise, compute what works best depending on the text luminance.
+ else {
+ uint16_t textHue, textSat, textLuminance;
+ uint8_t textAlpha;
+ NS_RGB2HSV(mCellHighlight.mFg, textHue, textSat, textLuminance, textAlpha);
+ // Text is darker than background, use a lighter shade
+ if (textLuminance < luminance) {
+ luminance += step;
+ }
+ // Otherwise, use a darker shade
+ else {
+ luminance -= step;
+ }
+ }
+ NS_HSV2RGB(mCellHighlight.mBg, hue, sat, luminance, alpha);
+}
+
+void nsLookAndFeel::NativeInit() { EnsureInit(); }
+
+void nsLookAndFeel::RefreshImpl() {
+ mInitialized = false;
+ moz_gtk_refresh();
+
+ nsXPLookAndFeel::RefreshImpl();
+}
+
+nsresult nsLookAndFeel::NativeGetColor(ColorID aID, ColorScheme aScheme,
+ nscolor& aColor) {
+ EnsureInit();
+
+ const auto& theme =
+ aScheme == ColorScheme::Light ? LightTheme() : DarkTheme();
+ return theme.GetColor(aID, aColor);
+}
+
+static bool ShouldUseColorForActiveDarkScrollbarThumb(nscolor aColor) {
+ auto IsDifferentEnough = [](int32_t aChannel, int32_t aOtherChannel) {
+ return std::abs(aChannel - aOtherChannel) > 10;
+ };
+ return IsDifferentEnough(NS_GET_R(aColor), NS_GET_G(aColor)) ||
+ IsDifferentEnough(NS_GET_R(aColor), NS_GET_B(aColor));
+}
+
+static bool ShouldUseThemedScrollbarColor(StyleSystemColor aID, nscolor aColor,
+ bool aIsDark) {
+ if (!aIsDark) {
+ return true;
+ }
+ if (StaticPrefs::widget_non_native_theme_scrollbar_dark_themed()) {
+ return true;
+ }
+ return aID == StyleSystemColor::ThemedScrollbarThumbActive &&
+ StaticPrefs::widget_non_native_theme_scrollbar_active_always_themed();
+}
+
+nsresult nsLookAndFeel::PerThemeData::GetColor(ColorID aID,
+ nscolor& aColor) const {
+ nsresult res = NS_OK;
+
+ switch (aID) {
+ // These colors don't seem to be used for anything anymore in Mozilla
+ // The CSS2 colors below are used.
+ case ColorID::Appworkspace: // MDI background color
+ case ColorID::Background: // desktop background
+ case ColorID::Window:
+ case ColorID::Windowframe:
+ case ColorID::MozCombobox:
+ aColor = mWindow.mBg;
+ break;
+ case ColorID::Windowtext:
+ aColor = mWindow.mFg;
+ break;
+ case ColorID::MozDialog:
+ aColor = mDialog.mBg;
+ break;
+ case ColorID::MozDialogtext:
+ aColor = mDialog.mFg;
+ break;
+ case ColorID::IMESelectedRawTextBackground:
+ case ColorID::IMESelectedConvertedTextBackground:
+ case ColorID::Highlight: // preference selected item,
+ aColor = mSelectedText.mBg;
+ break;
+ case ColorID::Highlighttext:
+ if (NS_GET_A(mSelectedText.mBg) < 155) {
+ aColor = NS_SAME_AS_FOREGROUND_COLOR;
+ break;
+ }
+ [[fallthrough]];
+ case ColorID::IMESelectedRawTextForeground:
+ case ColorID::IMESelectedConvertedTextForeground:
+ aColor = mSelectedText.mFg;
+ break;
+ case ColorID::Selecteditem:
+ aColor = mSelectedItem.mBg;
+ break;
+ case ColorID::Selecteditemtext:
+ aColor = mSelectedItem.mFg;
+ break;
+ case ColorID::Accentcolor:
+ aColor = mAccent.mBg;
+ break;
+ case ColorID::Accentcolortext:
+ aColor = mAccent.mFg;
+ break;
+ case ColorID::MozCellhighlight:
+ aColor = mCellHighlight.mBg;
+ break;
+ case ColorID::MozCellhighlighttext:
+ aColor = mCellHighlight.mFg;
+ break;
+ case ColorID::IMERawInputBackground:
+ case ColorID::IMEConvertedTextBackground:
+ aColor = NS_TRANSPARENT;
+ break;
+ case ColorID::IMERawInputForeground:
+ case ColorID::IMEConvertedTextForeground:
+ aColor = NS_SAME_AS_FOREGROUND_COLOR;
+ break;
+ case ColorID::IMERawInputUnderline:
+ case ColorID::IMEConvertedTextUnderline:
+ aColor = NS_SAME_AS_FOREGROUND_COLOR;
+ break;
+ case ColorID::IMESelectedRawTextUnderline:
+ case ColorID::IMESelectedConvertedTextUnderline:
+ aColor = NS_TRANSPARENT;
+ break;
+ case ColorID::Scrollbar:
+ aColor = mThemedScrollbar;
+ break;
+ case ColorID::ThemedScrollbar:
+ aColor = mThemedScrollbar;
+ if (!ShouldUseThemedScrollbarColor(aID, aColor, mIsDark)) {
+ return NS_ERROR_FAILURE;
+ }
+ break;
+ case ColorID::ThemedScrollbarInactive:
+ aColor = mThemedScrollbarInactive;
+ if (!ShouldUseThemedScrollbarColor(aID, aColor, mIsDark)) {
+ return NS_ERROR_FAILURE;
+ }
+ break;
+ case ColorID::ThemedScrollbarThumb:
+ aColor = mThemedScrollbarThumb;
+ if (!ShouldUseThemedScrollbarColor(aID, aColor, mIsDark)) {
+ return NS_ERROR_FAILURE;
+ }
+ break;
+ case ColorID::ThemedScrollbarThumbHover:
+ aColor = mThemedScrollbarThumbHover;
+ if (!ShouldUseThemedScrollbarColor(aID, aColor, mIsDark)) {
+ return NS_ERROR_FAILURE;
+ }
+ break;
+ case ColorID::ThemedScrollbarThumbActive:
+ aColor = mThemedScrollbarThumbActive;
+ if (!ShouldUseThemedScrollbarColor(aID, aColor, mIsDark)) {
+ return NS_ERROR_FAILURE;
+ }
+ break;
+ case ColorID::ThemedScrollbarThumbInactive:
+ aColor = mThemedScrollbarThumbInactive;
+ if (!ShouldUseThemedScrollbarColor(aID, aColor, mIsDark)) {
+ return NS_ERROR_FAILURE;
+ }
+ break;
+
+ // css2 http://www.w3.org/TR/REC-CSS2/ui.html#system-colors
+ case ColorID::Activeborder:
+ // active window border
+ aColor = mMozWindowActiveBorder;
+ break;
+ case ColorID::Inactiveborder:
+ // inactive window border
+ aColor = mMozWindowInactiveBorder;
+ break;
+ case ColorID::Graytext: // disabled text in windows, menus, etc.
+ aColor = mGrayText;
+ break;
+ case ColorID::Activecaption:
+ aColor = mTitlebar.mBg;
+ break;
+ case ColorID::Captiontext: // text in active window caption (titlebar)
+ aColor = mTitlebar.mFg;
+ break;
+ case ColorID::Inactivecaption:
+ // inactive window caption
+ aColor = mTitlebarInactive.mBg;
+ break;
+ case ColorID::Inactivecaptiontext:
+ aColor = mTitlebarInactive.mFg;
+ break;
+ case ColorID::Infobackground:
+ aColor = mInfo.mBg;
+ break;
+ case ColorID::Infotext:
+ aColor = mInfo.mFg;
+ break;
+ case ColorID::Menu:
+ aColor = mMenu.mBg;
+ break;
+ case ColorID::Menutext:
+ aColor = mMenu.mFg;
+ break;
+ case ColorID::MozHeaderbar:
+ aColor = mHeaderBar.mBg;
+ break;
+ case ColorID::MozHeaderbartext:
+ aColor = mHeaderBar.mFg;
+ break;
+ case ColorID::MozHeaderbarinactive:
+ aColor = mHeaderBarInactive.mBg;
+ break;
+ case ColorID::MozHeaderbarinactivetext:
+ aColor = mHeaderBarInactive.mFg;
+ break;
+ case ColorID::Threedface:
+ case ColorID::Buttonface:
+ case ColorID::MozButtondisabledface:
+ // 3-D face color
+ aColor = mWindow.mBg;
+ break;
+
+ case ColorID::Buttontext:
+ // text on push buttons
+ aColor = mButton.mFg;
+ break;
+
+ case ColorID::Buttonhighlight:
+ // 3-D highlighted edge color
+ case ColorID::Threedhighlight:
+ // 3-D highlighted outer edge color
+ aColor = mThreeDHighlight;
+ break;
+
+ case ColorID::Buttonshadow:
+ // 3-D shadow edge color
+ case ColorID::Threedshadow:
+ // 3-D shadow inner edge color
+ aColor = mThreeDShadow;
+ break;
+ case ColorID::Buttonborder:
+ aColor = mButtonBorder;
+ break;
+ case ColorID::Threedlightshadow:
+ case ColorID::MozDisabledfield:
+ aColor = mIsDark ? *GenericDarkColor(aID) : NS_RGB(0xE0, 0xE0, 0xE0);
+ break;
+ case ColorID::Threeddarkshadow:
+ aColor = mIsDark ? *GenericDarkColor(aID) : NS_RGB(0xDC, 0xDC, 0xDC);
+ break;
+
+ case ColorID::MozEventreerow:
+ case ColorID::Field:
+ aColor = mField.mBg;
+ break;
+ case ColorID::Fieldtext:
+ aColor = mField.mFg;
+ break;
+ case ColorID::MozSidebar:
+ aColor = mSidebar.mBg;
+ break;
+ case ColorID::MozSidebartext:
+ aColor = mSidebar.mFg;
+ break;
+ case ColorID::MozSidebarborder:
+ aColor = mSidebarBorder;
+ break;
+ case ColorID::MozButtonhoverface:
+ aColor = mButtonHover.mBg;
+ break;
+ case ColorID::MozButtonhovertext:
+ aColor = mButtonHover.mFg;
+ break;
+ case ColorID::MozButtonactiveface:
+ aColor = mButtonActive.mBg;
+ break;
+ case ColorID::MozButtonactivetext:
+ aColor = mButtonActive.mFg;
+ break;
+ case ColorID::MozMenuhover:
+ aColor = mMenuHover.mBg;
+ break;
+ case ColorID::MozMenuhovertext:
+ aColor = mMenuHover.mFg;
+ break;
+ case ColorID::MozMenuhoverdisabled:
+ aColor = NS_TRANSPARENT;
+ break;
+ case ColorID::MozOddtreerow:
+ aColor = mOddCellBackground;
+ break;
+ case ColorID::MozNativehyperlinktext:
+ aColor = mNativeHyperLinkText;
+ break;
+ case ColorID::MozNativevisitedhyperlinktext:
+ aColor = mNativeVisitedHyperLinkText;
+ break;
+ case ColorID::MozComboboxtext:
+ aColor = mComboBoxText;
+ break;
+ case ColorID::MozColheader:
+ aColor = mMozColHeader.mBg;
+ break;
+ case ColorID::MozColheadertext:
+ aColor = mMozColHeader.mFg;
+ break;
+ case ColorID::MozColheaderhover:
+ aColor = mMozColHeaderHover.mBg;
+ break;
+ case ColorID::MozColheaderhovertext:
+ aColor = mMozColHeaderHover.mFg;
+ break;
+ case ColorID::MozColheaderactive:
+ aColor = mMozColHeaderActive.mBg;
+ break;
+ case ColorID::MozColheaderactivetext:
+ aColor = mMozColHeaderActive.mFg;
+ break;
+ case ColorID::SpellCheckerUnderline:
+ case ColorID::Mark:
+ case ColorID::Marktext:
+ aColor = GetStandinForNativeColor(
+ aID, mIsDark ? ColorScheme::Dark : ColorScheme::Light);
+ break;
+ default:
+ /* default color is BLACK */
+ aColor = 0;
+ res = NS_ERROR_FAILURE;
+ break;
+ }
+
+ return res;
+}
+
+static int32_t CheckWidgetStyle(GtkWidget* aWidget, const char* aStyle,
+ int32_t aResult) {
+ gboolean value = FALSE;
+ gtk_widget_style_get(aWidget, aStyle, &value, nullptr);
+ return value ? aResult : 0;
+}
+
+static int32_t ConvertGTKStepperStyleToMozillaScrollArrowStyle(
+ GtkWidget* aWidget) {
+ if (!aWidget) return mozilla::LookAndFeel::eScrollArrowStyle_Single;
+
+ return CheckWidgetStyle(aWidget, "has-backward-stepper",
+ mozilla::LookAndFeel::eScrollArrow_StartBackward) |
+ CheckWidgetStyle(aWidget, "has-forward-stepper",
+ mozilla::LookAndFeel::eScrollArrow_EndForward) |
+ CheckWidgetStyle(aWidget, "has-secondary-backward-stepper",
+ mozilla::LookAndFeel::eScrollArrow_EndBackward) |
+ CheckWidgetStyle(aWidget, "has-secondary-forward-stepper",
+ mozilla::LookAndFeel::eScrollArrow_StartForward);
+}
+
+nsresult nsLookAndFeel::NativeGetInt(IntID aID, int32_t& aResult) {
+ nsresult res = NS_OK;
+
+ // We use delayed initialization by EnsureInit() here
+ // to make sure mozilla::Preferences is available (Bug 115807).
+ // IntID::UseAccessibilityTheme is requested before user preferences
+ // are read, and so EnsureInit(), which depends on preference values,
+ // is deliberately delayed until required.
+ switch (aID) {
+ case IntID::ScrollButtonLeftMouseButtonAction:
+ aResult = 0;
+ break;
+ case IntID::ScrollButtonMiddleMouseButtonAction:
+ aResult = 1;
+ break;
+ case IntID::ScrollButtonRightMouseButtonAction:
+ aResult = 2;
+ break;
+ case IntID::CaretBlinkTime:
+ EnsureInit();
+ aResult = mCaretBlinkTime;
+ break;
+ case IntID::CaretBlinkCount:
+ EnsureInit();
+ aResult = mCaretBlinkCount;
+ break;
+ case IntID::CaretWidth:
+ aResult = 1;
+ break;
+ case IntID::ShowCaretDuringSelection:
+ aResult = 0;
+ break;
+ case IntID::SelectTextfieldsOnKeyFocus: {
+ GtkSettings* settings;
+ gboolean select_on_focus;
+
+ settings = gtk_settings_get_default();
+ g_object_get(settings, "gtk-entry-select-on-focus", &select_on_focus,
+ nullptr);
+
+ if (select_on_focus)
+ aResult = 1;
+ else
+ aResult = 0;
+
+ } break;
+ case IntID::ScrollToClick: {
+ GtkSettings* settings;
+ gboolean warps_slider = FALSE;
+
+ settings = gtk_settings_get_default();
+ if (g_object_class_find_property(G_OBJECT_GET_CLASS(settings),
+ "gtk-primary-button-warps-slider")) {
+ g_object_get(settings, "gtk-primary-button-warps-slider", &warps_slider,
+ nullptr);
+ }
+
+ if (warps_slider)
+ aResult = 1;
+ else
+ aResult = 0;
+ } break;
+ case IntID::SubmenuDelay: {
+ GtkSettings* settings;
+ gint delay;
+
+ settings = gtk_settings_get_default();
+ g_object_get(settings, "gtk-menu-popup-delay", &delay, nullptr);
+ aResult = (int32_t)delay;
+ break;
+ }
+ case IntID::TooltipDelay: {
+ aResult = 500;
+ break;
+ }
+ case IntID::MenusCanOverlapOSBar:
+ // we want XUL popups to be able to overlap the task bar.
+ aResult = 1;
+ break;
+ case IntID::SkipNavigatingDisabledMenuItem:
+ aResult = 1;
+ break;
+ case IntID::DragThresholdX:
+ case IntID::DragThresholdY: {
+ gint threshold = 0;
+ g_object_get(gtk_settings_get_default(), "gtk-dnd-drag-threshold",
+ &threshold, nullptr);
+
+ aResult = threshold;
+ } break;
+ case IntID::ScrollArrowStyle: {
+ GtkWidget* scrollbar = GetWidget(MOZ_GTK_SCROLLBAR_VERTICAL);
+ aResult = ConvertGTKStepperStyleToMozillaScrollArrowStyle(scrollbar);
+ break;
+ }
+ case IntID::TreeOpenDelay:
+ aResult = 1000;
+ break;
+ case IntID::TreeCloseDelay:
+ aResult = 1000;
+ break;
+ case IntID::TreeLazyScrollDelay:
+ aResult = 150;
+ break;
+ case IntID::TreeScrollDelay:
+ aResult = 100;
+ break;
+ case IntID::TreeScrollLinesMax:
+ aResult = 3;
+ break;
+ case IntID::AlertNotificationOrigin:
+ aResult = NS_ALERT_TOP;
+ break;
+ case IntID::IMERawInputUnderlineStyle:
+ case IntID::IMEConvertedTextUnderlineStyle:
+ aResult = static_cast<int32_t>(StyleTextDecorationStyle::Solid);
+ 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::MenuBarDrag:
+ EnsureInit();
+ aResult = mSystemTheme.mMenuSupportsDrag;
+ break;
+ case IntID::ScrollbarButtonAutoRepeatBehavior:
+ aResult = 1;
+ break;
+ case IntID::SwipeAnimationEnabled:
+ aResult = 1;
+ break;
+ case IntID::ContextMenuOffsetVertical:
+ case IntID::ContextMenuOffsetHorizontal:
+ aResult = 2;
+ break;
+ case IntID::GTKCSDAvailable:
+ aResult = sCSDAvailable;
+ break;
+ case IntID::GTKCSDMaximizeButton:
+ EnsureInit();
+ aResult = mCSDMaximizeButton;
+ break;
+ case IntID::GTKCSDMinimizeButton:
+ EnsureInit();
+ aResult = mCSDMinimizeButton;
+ break;
+ case IntID::GTKCSDCloseButton:
+ EnsureInit();
+ aResult = mCSDCloseButton;
+ break;
+ case IntID::GTKCSDReversedPlacement:
+ EnsureInit();
+ aResult = mCSDReversedPlacement;
+ break;
+ case IntID::PrefersReducedMotion: {
+ EnsureInit();
+ aResult = mPrefersReducedMotion;
+ break;
+ }
+ case IntID::SystemUsesDarkTheme: {
+ EnsureInit();
+ if (mColorSchemePreference) {
+ aResult = *mColorSchemePreference == ColorScheme::Dark;
+ } else {
+ aResult = mSystemTheme.mIsDark;
+ }
+ break;
+ }
+ case IntID::GTKCSDMaximizeButtonPosition:
+ aResult = mCSDMaximizeButtonPosition;
+ break;
+ case IntID::GTKCSDMinimizeButtonPosition:
+ aResult = mCSDMinimizeButtonPosition;
+ break;
+ case IntID::GTKCSDCloseButtonPosition:
+ aResult = mCSDCloseButtonPosition;
+ break;
+ case IntID::GTKThemeFamily: {
+ EnsureInit();
+ aResult = int32_t(EffectiveTheme().mFamily);
+ break;
+ }
+ case IntID::UseAccessibilityTheme:
+ // If high contrast is enabled, enable prefers-reduced-transparency media
+ // query as well as there is no dedicated option.
+ case IntID::PrefersReducedTransparency:
+ EnsureInit();
+ aResult = mSystemTheme.mHighContrast;
+ break;
+ case IntID::InvertedColors:
+ // No GTK API for checking if inverted colors is enabled
+ aResult = 0;
+ break;
+ case IntID::TitlebarRadius: {
+ EnsureInit();
+ aResult = EffectiveTheme().mTitlebarRadius;
+ break;
+ }
+ case IntID::AllowOverlayScrollbarsOverlap: {
+ aResult = 1;
+ break;
+ }
+ case IntID::ScrollbarFadeBeginDelay: {
+ aResult = 1000;
+ break;
+ }
+ case IntID::ScrollbarFadeDuration: {
+ aResult = 400;
+ break;
+ }
+ case IntID::ScrollbarDisplayOnMouseMove: {
+ aResult = 1;
+ break;
+ }
+ case IntID::PanelAnimations:
+ aResult = [&]() -> bool {
+ if (!sCSDAvailable) {
+ // Disabled on systems without CSD, see bug 1385079.
+ return false;
+ }
+ if (GdkIsWaylandDisplay()) {
+ // Disabled on wayland, see bug 1800442 and bug 1800368.
+ return false;
+ }
+ return true;
+ }();
+ break;
+ case IntID::UseOverlayScrollbars: {
+ aResult = StaticPrefs::widget_gtk_overlay_scrollbars_enabled();
+ break;
+ }
+ case IntID::HideCursorWhileTyping: {
+ aResult = StaticPrefs::widget_gtk_hide_pointer_while_typing_enabled();
+ break;
+ }
+ case IntID::TouchDeviceSupportPresent:
+ aResult = widget::WidgetUtilsGTK::IsTouchDeviceSupportPresent();
+ break;
+ default:
+ aResult = 0;
+ res = NS_ERROR_FAILURE;
+ }
+
+ return res;
+}
+
+nsresult nsLookAndFeel::NativeGetFloat(FloatID aID, float& aResult) {
+ nsresult rv = NS_OK;
+ switch (aID) {
+ case FloatID::IMEUnderlineRelativeSize:
+ aResult = 1.0f;
+ break;
+ case FloatID::SpellCheckerUnderlineRelativeSize:
+ aResult = 1.0f;
+ break;
+ case FloatID::CaretAspectRatio:
+ EnsureInit();
+ aResult = mSystemTheme.mCaretRatio;
+ break;
+ case FloatID::TextScaleFactor:
+ aResult = gfxPlatformGtk::GetFontScaleFactor();
+ break;
+ default:
+ aResult = -1.0;
+ rv = NS_ERROR_FAILURE;
+ }
+ return rv;
+}
+
+static void GetSystemFontInfo(GtkStyleContext* aStyle, nsString* aFontName,
+ gfxFontStyle* aFontStyle) {
+ aFontStyle->style = FontSlantStyle::NORMAL;
+
+ // As in
+ // https://git.gnome.org/browse/gtk+/tree/gtk/gtkwidget.c?h=3.22.19#n10333
+ PangoFontDescription* desc;
+ gtk_style_context_get(aStyle, gtk_style_context_get_state(aStyle), "font",
+ &desc, nullptr);
+
+ aFontStyle->systemFont = true;
+
+ constexpr auto quote = u"\""_ns;
+ NS_ConvertUTF8toUTF16 family(pango_font_description_get_family(desc));
+ *aFontName = quote + family + quote;
+
+ aFontStyle->weight =
+ FontWeight::FromInt(pango_font_description_get_weight(desc));
+
+ // FIXME: Set aFontStyle->stretch correctly!
+ aFontStyle->stretch = FontStretch::NORMAL;
+
+ float size = float(pango_font_description_get_size(desc)) / PANGO_SCALE;
+
+ // |size| is now either pixels or pango-points (not Mozilla-points!)
+
+ if (!pango_font_description_get_size_is_absolute(desc)) {
+ // |size| is in pango-points, so convert to pixels.
+ size *= float(gfxPlatformGtk::GetFontScaleDPI()) / POINTS_PER_INCH_FLOAT;
+ }
+
+ // |size| is now pixels but not scaled for the hidpi displays,
+ aFontStyle->size = size;
+
+ pango_font_description_free(desc);
+}
+
+bool nsLookAndFeel::NativeGetFont(FontID aID, nsString& aFontName,
+ gfxFontStyle& aFontStyle) {
+ return mSystemTheme.GetFont(aID, aFontName, aFontStyle);
+}
+
+bool nsLookAndFeel::PerThemeData::GetFont(FontID aID, nsString& aFontName,
+ gfxFontStyle& aFontStyle) const {
+ switch (aID) {
+ case FontID::Menu: // css2
+ case FontID::MozPullDownMenu: // css3
+ aFontName = mMenuFontName;
+ aFontStyle = mMenuFontStyle;
+ break;
+
+ case FontID::MozField: // css3
+ case FontID::MozList: // css3
+ aFontName = mFieldFontName;
+ aFontStyle = mFieldFontStyle;
+ break;
+
+ case FontID::MozButton: // css3
+ aFontName = mButtonFontName;
+ aFontStyle = mButtonFontStyle;
+ break;
+
+ case FontID::Caption: // css2
+ case FontID::Icon: // css2
+ case FontID::MessageBox: // css2
+ case FontID::SmallCaption: // css2
+ case FontID::StatusBar: // css2
+ default:
+ aFontName = mDefaultFontName;
+ aFontStyle = mDefaultFontStyle;
+ break;
+ }
+
+ // Convert GDK pixels to CSS pixels.
+ // When "layout.css.devPixelsPerPx" > 0, this is not a direct conversion.
+ // The difference produces a scaling of system fonts in proportion with
+ // other scaling from the change in CSS pixel sizes.
+ aFontStyle.size /= LookAndFeel::GetTextScaleFactor();
+ return true;
+}
+
+static nsCString GetGtkSettingsStringKey(const char* aKey) {
+ MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
+ nsCString ret;
+ GtkSettings* settings = gtk_settings_get_default();
+ char* value = nullptr;
+ g_object_get(settings, aKey, &value, nullptr);
+ if (value) {
+ ret.Assign(value);
+ g_free(value);
+ }
+ return ret;
+}
+
+static nsCString GetGtkTheme() {
+ return GetGtkSettingsStringKey("gtk-theme-name");
+}
+
+static bool GetPreferDarkTheme() {
+ GtkSettings* settings = gtk_settings_get_default();
+ gboolean preferDarkTheme = FALSE;
+ g_object_get(settings, "gtk-application-prefer-dark-theme", &preferDarkTheme,
+ nullptr);
+ return preferDarkTheme == TRUE;
+}
+
+// It seems GTK doesn't have an API to query if the current theme is "light" or
+// "dark", so we synthesize it from the CSS2 Window/WindowText colors instead,
+// by comparing their luminosity.
+static bool GetThemeIsDark() {
+ GdkRGBA bg, fg;
+ GtkStyleContext* style = GetStyleContext(MOZ_GTK_WINDOW);
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &bg);
+ gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &fg);
+ return RelativeLuminanceUtils::Compute(GDK_RGBA_TO_NS_RGBA(bg)) <
+ RelativeLuminanceUtils::Compute(GDK_RGBA_TO_NS_RGBA(fg));
+}
+
+void nsLookAndFeel::RestoreSystemTheme() {
+ LOGLNF("RestoreSystemTheme(%s, %d, %d)\n", mSystemTheme.mName.get(),
+ mSystemTheme.mPreferDarkTheme, mSystemThemeOverridden);
+
+ if (!mSystemThemeOverridden) {
+ return;
+ }
+
+ // Available on Gtk 3.20+.
+ static auto sGtkSettingsResetProperty =
+ (void (*)(GtkSettings*, const gchar*))dlsym(
+ RTLD_DEFAULT, "gtk_settings_reset_property");
+
+ GtkSettings* settings = gtk_settings_get_default();
+ if (sGtkSettingsResetProperty) {
+ sGtkSettingsResetProperty(settings, "gtk-theme-name");
+ sGtkSettingsResetProperty(settings, "gtk-application-prefer-dark-theme");
+ } else {
+ g_object_set(settings, "gtk-theme-name", mSystemTheme.mName.get(),
+ "gtk-application-prefer-dark-theme",
+ mSystemTheme.mPreferDarkTheme, nullptr);
+ }
+ mSystemThemeOverridden = false;
+ UpdateRoundedBottomCornerStyles();
+ moz_gtk_refresh();
+}
+
+static bool AnyColorChannelIsDifferent(nscolor aColor) {
+ return NS_GET_R(aColor) != NS_GET_G(aColor) ||
+ NS_GET_R(aColor) != NS_GET_B(aColor);
+}
+
+bool nsLookAndFeel::ConfigureAltTheme() {
+ GtkSettings* settings = gtk_settings_get_default();
+ // Toggling gtk-application-prefer-dark-theme is not enough generally to
+ // switch from dark to light theme. If the theme didn't change, and we have
+ // a dark theme, try to first remove -Dark{,er,est} from the theme name to
+ // find the light variant.
+ if (mSystemTheme.mIsDark) {
+ nsCString potentialLightThemeName = mSystemTheme.mName;
+ // clang-format off
+ constexpr nsLiteralCString kSubstringsToRemove[] = {
+ "-darkest"_ns, "-darker"_ns, "-dark"_ns,
+ "-Darkest"_ns, "-Darker"_ns, "-Dark"_ns,
+ "_darkest"_ns, "_darker"_ns, "_dark"_ns,
+ "_Darkest"_ns, "_Darker"_ns, "_Dark"_ns,
+ };
+ // clang-format on
+ bool found = false;
+ for (const auto& s : kSubstringsToRemove) {
+ potentialLightThemeName = mSystemTheme.mName;
+ potentialLightThemeName.ReplaceSubstring(s, ""_ns);
+ if (potentialLightThemeName.Length() != mSystemTheme.mName.Length()) {
+ found = true;
+ break;
+ }
+ }
+ if (found) {
+ LOGLNF(" found potential light variant of %s: %s",
+ mSystemTheme.mName.get(), potentialLightThemeName.get());
+ g_object_set(settings, "gtk-theme-name", potentialLightThemeName.get(),
+ "gtk-application-prefer-dark-theme", !mSystemTheme.mIsDark,
+ nullptr);
+ moz_gtk_refresh();
+
+ if (!GetThemeIsDark()) {
+ return true; // Success!
+ }
+ }
+ }
+
+ LOGLNF(" toggling gtk-application-prefer-dark-theme");
+ g_object_set(settings, "gtk-application-prefer-dark-theme",
+ !mSystemTheme.mIsDark, nullptr);
+ moz_gtk_refresh();
+ if (mSystemTheme.mIsDark != GetThemeIsDark()) {
+ return true; // Success!
+ }
+
+ LOGLNF(" didn't work, falling back to default theme");
+ // If the theme still didn't change enough, fall back to Adwaita with the
+ // appropriate color preference.
+ g_object_set(settings, "gtk-theme-name", "Adwaita",
+ "gtk-application-prefer-dark-theme", !mSystemTheme.mIsDark,
+ nullptr);
+ moz_gtk_refresh();
+
+ // If it _still_ didn't change enough, and we're looking for a dark theme,
+ // try to set Adwaita-dark as a theme name. This might be needed in older GTK
+ // versions.
+ if (!mSystemTheme.mIsDark && !GetThemeIsDark()) {
+ LOGLNF(" last resort Adwaita-dark fallback");
+ g_object_set(settings, "gtk-theme-name", "Adwaita-dark", nullptr);
+ moz_gtk_refresh();
+ }
+
+ return false;
+}
+
+// We override some adwaita colors from GTK3 to LibAdwaita, see:
+// https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/named-colors.html
+void nsLookAndFeel::MaybeApplyAdwaitaOverrides() {
+ auto& dark = mSystemTheme.mIsDark ? mSystemTheme : mAltTheme;
+ auto& light = mSystemTheme.mIsDark ? mAltTheme : mSystemTheme;
+
+ // Unconditional special case for Adwaita-dark: In GTK3 we don't have more
+ // proper accent colors, so we use the selected background colors. Those
+ // colors, however, don't have much contrast in dark mode (see bug 1741293).
+ if (dark.mFamily == ThemeFamily::Adwaita) {
+ dark.mAccent = {NS_RGB(0x35, 0x84, 0xe4), NS_RGB(0xff, 0xff, 0xff)};
+ dark.mSelectedText = dark.mAccent;
+ }
+
+ if (light.mFamily == ThemeFamily::Adwaita) {
+ light.mAccent = {NS_RGB(0x35, 0x84, 0xe4), NS_RGB(0xff, 0xff, 0xff)};
+ light.mSelectedText = light.mAccent;
+ }
+
+ if (!StaticPrefs::widget_gtk_libadwaita_colors_enabled()) {
+ return;
+ }
+
+ if (light.mFamily == ThemeFamily::Adwaita) {
+ // #323232 is rgba(0,0,0,.8) over #fafafa.
+ light.mWindow =
+ light.mDialog = {NS_RGB(0xfa, 0xfa, 0xfa), NS_RGB(0x32, 0x32, 0x32)};
+ light.mField = {NS_RGB(0xff, 0xff, 0xff), NS_RGB(0x32, 0x32, 0x32)};
+
+ // We use the sidebar colors for the headerbar in light mode background
+ // because it creates much better contrast. GTK headerbar colors are white,
+ // and meant to "blend" with the contents otherwise.
+ // #2f2f2f is rgba(0,0,0,.8) over #ebebeb.
+ light.mSidebar = light.mHeaderBar =
+ light.mTitlebar = {NS_RGB(0xeb, 0xeb, 0xeb), NS_RGB(0x2f, 0x2f, 0x2f)};
+ light.mHeaderBarInactive = light.mTitlebarInactive = {
+ NS_RGB(0xf2, 0xf2, 0xf2), NS_RGB(0x2f, 0x2f, 0x2f)};
+ light.mThreeDShadow = NS_RGB(0xe0, 0xe0, 0xe0);
+ light.mSidebarBorder = NS_RGBA(0, 0, 0, 18);
+ }
+
+ if (dark.mFamily == ThemeFamily::Adwaita) {
+ dark.mWindow = {NS_RGB(0x24, 0x24, 0x24), NS_RGB(0xff, 0xff, 0xff)};
+ dark.mDialog = {NS_RGB(0x38, 0x38, 0x38), NS_RGB(0xff, 0xff, 0xff)};
+ dark.mField = {NS_RGB(0x3a, 0x3a, 0x3a), NS_RGB(0xff, 0xff, 0xff)};
+ dark.mSidebar = dark.mHeaderBar =
+ dark.mTitlebar = {NS_RGB(0x30, 0x30, 0x30), NS_RGB(0xff, 0xff, 0xff)};
+ dark.mHeaderBarInactive = dark.mTitlebarInactive = {
+ NS_RGB(0x24, 0x24, 0x24), NS_RGB(0xff, 0xff, 0xff)};
+ // headerbar_shade_color
+ dark.mThreeDShadow = NS_RGB(0x1f, 0x1f, 0x1f);
+ dark.mSidebarBorder = NS_RGBA(0, 0, 0, 92);
+ }
+}
+
+void nsLookAndFeel::ConfigureAndInitializeAltTheme() {
+ const bool fellBackToDefaultTheme = !ConfigureAltTheme();
+
+ mAltTheme.Init();
+
+ MaybeApplyAdwaitaOverrides();
+
+ // Some of the alt theme colors we can grab from the system theme, if we fell
+ // back to the default light / dark themes.
+ if (fellBackToDefaultTheme) {
+ if (StaticPrefs::widget_gtk_alt_theme_selection()) {
+ mAltTheme.mSelectedText = mSystemTheme.mSelectedText;
+ }
+
+ if (StaticPrefs::widget_gtk_alt_theme_scrollbar_active() &&
+ (!mAltTheme.mIsDark || ShouldUseColorForActiveDarkScrollbarThumb(
+ mSystemTheme.mThemedScrollbarThumbActive))) {
+ mAltTheme.mThemedScrollbarThumbActive =
+ mSystemTheme.mThemedScrollbarThumbActive;
+ }
+
+ if (StaticPrefs::widget_gtk_alt_theme_accent()) {
+ mAltTheme.mAccent = mSystemTheme.mAccent;
+ }
+ }
+
+ // Right now we're using the opposite color-scheme theme, make sure to record
+ // it.
+ mSystemThemeOverridden = true;
+ UpdateRoundedBottomCornerStyles();
+}
+
+void nsLookAndFeel::ClearRoundedCornerProvider() {
+ if (mRoundedCornerProvider) {
+ gtk_style_context_remove_provider_for_screen(
+ gdk_screen_get_default(),
+ GTK_STYLE_PROVIDER(mRoundedCornerProvider.get()));
+ mRoundedCornerProvider = nullptr;
+ }
+}
+
+void nsLookAndFeel::UpdateRoundedBottomCornerStyles() {
+ ClearRoundedCornerProvider();
+ if (!StaticPrefs::widget_gtk_rounded_bottom_corners_enabled()) {
+ return;
+ }
+ int32_t radius = EffectiveTheme().mTitlebarRadius;
+ if (!radius) {
+ return;
+ }
+ mRoundedCornerProvider = dont_AddRef(gtk_css_provider_new());
+ nsPrintfCString string(
+ "window.csd decoration {"
+ "border-bottom-right-radius: %dpx;"
+ "border-bottom-left-radius: %dpx;"
+ "}\n",
+ radius, radius);
+ GUniquePtr<GError> error;
+ if (!gtk_css_provider_load_from_data(mRoundedCornerProvider.get(),
+ string.get(), string.Length(),
+ getter_Transfers(error))) {
+ NS_WARNING(nsPrintfCString("Failed to load provider: %s - %s\n",
+ string.get(), error ? error->message : nullptr)
+ .get());
+ }
+ gtk_style_context_add_provider_for_screen(
+ gdk_screen_get_default(),
+ GTK_STYLE_PROVIDER(mRoundedCornerProvider.get()),
+ GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+}
+
+Maybe<ColorScheme> nsLookAndFeel::ComputeColorSchemeSetting() {
+ {
+ // Check the pref explicitly here. Usually this shouldn't be needed, but
+ // since we can only load one GTK theme at a time, and the pref will
+ // override the effective value that the rest of gecko assumes for the
+ // "system" color scheme, we need to factor it in our GTK theme decisions.
+ int32_t pref = 0;
+ if (NS_SUCCEEDED(Preferences::GetInt("ui.systemUsesDarkTheme", &pref))) {
+ return Some(pref ? ColorScheme::Dark : ColorScheme::Light);
+ }
+ }
+
+ if (!mDBusSettingsProxy) {
+ return Nothing();
+ }
+ GUniquePtr<GError> error;
+ RefPtr<GVariant> variant = dont_AddRef(g_dbus_proxy_call_sync(
+ mDBusSettingsProxy, "Read",
+ g_variant_new("(ss)", "org.freedesktop.appearance", "color-scheme"),
+ G_DBUS_CALL_FLAGS_NONE,
+ StaticPrefs::widget_gtk_settings_portal_timeout_ms(), nullptr,
+ getter_Transfers(error)));
+ if (!variant) {
+ LOGLNF("color-scheme query error: %s\n", error->message);
+ return Nothing();
+ }
+ LOGLNF("color-scheme query result: %s\n", GVariantToString(variant).get());
+ variant = dont_AddRef(g_variant_get_child_value(variant, 0));
+ while (variant && g_variant_is_of_type(variant, G_VARIANT_TYPE_VARIANT)) {
+ // Unbox the return value.
+ variant = dont_AddRef(g_variant_get_variant(variant));
+ }
+ if (!variant || !g_variant_is_of_type(variant, G_VARIANT_TYPE_UINT32)) {
+ MOZ_ASSERT(false, "Unexpected color-scheme query return value");
+ return Nothing();
+ }
+ switch (g_variant_get_uint32(variant)) {
+ default:
+ MOZ_FALLTHROUGH_ASSERT("Unexpected color-scheme query return value");
+ case 0:
+ break;
+ case 1:
+ return Some(ColorScheme::Dark);
+ case 2:
+ return Some(ColorScheme::Light);
+ }
+ return Nothing();
+}
+
+void nsLookAndFeel::Initialize() {
+ LOGLNF("nsLookAndFeel::Initialize");
+ MOZ_DIAGNOSTIC_ASSERT(!mInitialized);
+ MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread(),
+ "LookAndFeel init should be done on the main thread");
+
+ mInitialized = true;
+
+ GtkSettings* settings = gtk_settings_get_default();
+ if (MOZ_UNLIKELY(!settings)) {
+ NS_WARNING("EnsureInit: No settings");
+ return;
+ }
+
+ AutoRestore<bool> restoreIgnoreSettings(sIgnoreChangedSettings);
+ sIgnoreChangedSettings = true;
+
+ // Our current theme may be different from the system theme if we're matching
+ // the Firefox theme or using the alt theme intentionally due to the
+ // color-scheme preference. Make sure to restore the original system theme.
+ RestoreSystemTheme();
+
+ // First initialize global settings.
+ InitializeGlobalSettings();
+
+ // Record our system theme settings now.
+ mSystemTheme.Init();
+
+ // Find the alternative-scheme theme (light if the system theme is dark, or
+ // vice versa), configure it and initialize it.
+ ConfigureAndInitializeAltTheme();
+
+ LOGLNF("System Theme: %s. Alt Theme: %s\n", mSystemTheme.mName.get(),
+ mAltTheme.mName.get());
+
+ // Go back to the system theme or keep the alt theme configured, depending on
+ // Firefox theme or user color-scheme preference.
+ ConfigureFinalEffectiveTheme();
+
+ RecordTelemetry();
+}
+
+void nsLookAndFeel::OnColorSchemeSettingChanged() {
+ if (NS_WARN_IF(mColorSchemePreference == ComputeColorSchemeSetting())) {
+ // We sometimes get duplicate color-scheme changes from dbus, avoid doing
+ // extra work if not needed.
+ return;
+ }
+ OnSettingsChange();
+}
+
+void nsLookAndFeel::InitializeGlobalSettings() {
+ GtkSettings* settings = gtk_settings_get_default();
+
+ mColorSchemePreference = ComputeColorSchemeSetting();
+
+ gboolean enableAnimations = false;
+ g_object_get(settings, "gtk-enable-animations", &enableAnimations, nullptr);
+ mPrefersReducedMotion = !enableAnimations;
+
+ gint blink_time = 0; // In milliseconds
+ gint blink_timeout = 0; // in seconds
+ gboolean blink;
+ g_object_get(settings, "gtk-cursor-blink-time", &blink_time,
+ "gtk-cursor-blink-timeout", &blink_timeout, "gtk-cursor-blink",
+ &blink, nullptr);
+ // From
+ // https://docs.gtk.org/gtk3/property.Settings.gtk-cursor-blink-timeout.html:
+ //
+ // Setting this to zero has the same effect as setting
+ // GtkSettings:gtk-cursor-blink to FALSE.
+ //
+ mCaretBlinkTime = blink && blink_timeout ? (int32_t)blink_time : 0;
+
+ if (mCaretBlinkTime) {
+ // blink_time * 2 because blink count is a full blink cycle.
+ mCaretBlinkCount =
+ std::max(1, int32_t(std::ceil(float(blink_timeout * 1000) /
+ (float(blink_time) * 2.0f))));
+ } else {
+ mCaretBlinkCount = -1;
+ }
+
+ mCSDCloseButton = false;
+ mCSDMinimizeButton = false;
+ mCSDMaximizeButton = false;
+ mCSDCloseButtonPosition = 0;
+ mCSDMinimizeButtonPosition = 0;
+ mCSDMaximizeButtonPosition = 0;
+
+ // We need to initialize whole CSD config explicitly because it's queried
+ // as -moz-gtk* media features.
+ ButtonLayout buttonLayout[TOOLBAR_BUTTONS];
+
+ size_t activeButtons =
+ GetGtkHeaderBarButtonLayout(Span(buttonLayout), &mCSDReversedPlacement);
+ for (size_t i = 0; i < activeButtons; i++) {
+ // We check if a button is represented on the right side of the tabbar.
+ // Then we assign it a value from 3 to 5, instead of 0 to 2 when it is on
+ // the left side.
+ const ButtonLayout& layout = buttonLayout[i];
+ int32_t* pos = nullptr;
+ switch (layout.mType) {
+ case MOZ_GTK_HEADER_BAR_BUTTON_MINIMIZE:
+ mCSDMinimizeButton = true;
+ pos = &mCSDMinimizeButtonPosition;
+ break;
+ case MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE:
+ mCSDMaximizeButton = true;
+ pos = &mCSDMaximizeButtonPosition;
+ break;
+ case MOZ_GTK_HEADER_BAR_BUTTON_CLOSE:
+ mCSDCloseButton = true;
+ pos = &mCSDCloseButtonPosition;
+ break;
+ default:
+ break;
+ }
+
+ if (pos) {
+ *pos = i;
+ }
+ }
+
+ struct actionMapping {
+ TitlebarAction action;
+ char name[100];
+ } ActionMapping[] = {
+ {TitlebarAction::None, "none"},
+ {TitlebarAction::WindowLower, "lower"},
+ {TitlebarAction::WindowMenu, "menu"},
+ {TitlebarAction::WindowMinimize, "minimize"},
+ {TitlebarAction::WindowMaximize, "maximize"},
+ {TitlebarAction::WindowMaximizeToggle, "toggle-maximize"},
+ };
+
+ auto GetWindowAction = [&](const char* eventName) -> TitlebarAction {
+ gchar* action = nullptr;
+ g_object_get(settings, eventName, &action, nullptr);
+ if (!action) {
+ return TitlebarAction::None;
+ }
+ auto free = mozilla::MakeScopeExit([&] { g_free(action); });
+ for (auto const& mapping : ActionMapping) {
+ if (!strncmp(action, mapping.name, strlen(mapping.name))) {
+ return mapping.action;
+ }
+ }
+ return TitlebarAction::None;
+ };
+
+ mDoubleClickAction = GetWindowAction("gtk-titlebar-double-click");
+ mMiddleClickAction = GetWindowAction("gtk-titlebar-middle-click");
+}
+
+void nsLookAndFeel::ConfigureFinalEffectiveTheme() {
+ MOZ_ASSERT(mSystemThemeOverridden,
+ "By this point, the alt theme should be configured");
+ const bool shouldUseSystemTheme = [&] {
+ using ChromeSetting = PreferenceSheet::ChromeColorSchemeSetting;
+ // NOTE: We can't call ColorSchemeForChrome directly because this might run
+ // while we're computing it.
+ switch (PreferenceSheet::ColorSchemeSettingForChrome()) {
+ case ChromeSetting::Light:
+ return !mSystemTheme.mIsDark;
+ case ChromeSetting::Dark:
+ return mSystemTheme.mIsDark;
+ case ChromeSetting::System:
+ break;
+ };
+ if (!mColorSchemePreference) {
+ return true;
+ }
+ const bool preferenceIsDark = *mColorSchemePreference == ColorScheme::Dark;
+ return preferenceIsDark == mSystemTheme.mIsDark;
+ }();
+
+ const bool usingSystem = !mSystemThemeOverridden;
+ LOGLNF("OverrideSystemThemeIfNeeded(matchesSystem=%d, usingSystem=%d)\n",
+ shouldUseSystemTheme, usingSystem);
+
+ if (shouldUseSystemTheme) {
+ RestoreSystemTheme();
+ } else if (usingSystem) {
+ LOGLNF("Setting theme %s, %d\n", mAltTheme.mName.get(),
+ mAltTheme.mPreferDarkTheme);
+
+ GtkSettings* settings = gtk_settings_get_default();
+ if (mSystemTheme.mName == mAltTheme.mName) {
+ // Prefer setting only gtk-application-prefer-dark-theme, so we can still
+ // get notified from notify::gtk-theme-name if the user changes the theme.
+ g_object_set(settings, "gtk-application-prefer-dark-theme",
+ mAltTheme.mPreferDarkTheme, nullptr);
+ } else {
+ g_object_set(settings, "gtk-theme-name", mAltTheme.mName.get(),
+ "gtk-application-prefer-dark-theme",
+ mAltTheme.mPreferDarkTheme, nullptr);
+ }
+ mSystemThemeOverridden = true;
+ UpdateRoundedBottomCornerStyles();
+ moz_gtk_refresh();
+ }
+}
+
+static bool GetColorFromBackgroundImage(GtkStyleContext* aStyle,
+ nscolor aForForegroundColor,
+ GtkStateFlags aState, nscolor* aColor) {
+ GValue value = G_VALUE_INIT;
+ gtk_style_context_get_property(aStyle, "background-image", aState, &value);
+ auto cleanup = MakeScopeExit([&] { g_value_unset(&value); });
+ if (GetColorFromImagePattern(&value, aColor)) {
+ return true;
+ }
+
+ {
+ GdkRGBA light, dark;
+ if (GetGradientColors(&value, &light, &dark)) {
+ nscolor l = GDK_RGBA_TO_NS_RGBA(light);
+ nscolor d = GDK_RGBA_TO_NS_RGBA(dark);
+ // Return the one with more contrast.
+ // TODO(emilio): This could do interpolation or what not but seems
+ // overkill.
+ if (NS_LUMINOSITY_DIFFERENCE(l, aForForegroundColor) >
+ NS_LUMINOSITY_DIFFERENCE(d, aForForegroundColor)) {
+ *aColor = l;
+ } else {
+ *aColor = d;
+ }
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static nscolor GetBackgroundColor(
+ GtkStyleContext* aStyle, nscolor aForForegroundColor,
+ GtkStateFlags aState = GTK_STATE_FLAG_NORMAL,
+ nscolor aOverBackgroundColor = NS_TRANSPARENT) {
+ // Try to synthesize a color from a background-image.
+ nscolor imageColor = NS_TRANSPARENT;
+ if (GetColorFromBackgroundImage(aStyle, aForForegroundColor, aState,
+ &imageColor)) {
+ if (NS_GET_A(imageColor) == 255) {
+ return imageColor;
+ }
+ }
+
+ GdkRGBA gdkColor;
+ gtk_style_context_get_background_color(aStyle, aState, &gdkColor);
+ nscolor bgColor = GDK_RGBA_TO_NS_RGBA(gdkColor);
+ // background-image paints over background-color.
+ const nscolor finalColor = NS_ComposeColors(bgColor, imageColor);
+ if (finalColor != aOverBackgroundColor) {
+ return finalColor;
+ }
+ return NS_TRANSPARENT;
+}
+
+static nscolor GetTextColor(GtkStyleContext* aStyle,
+ GtkStateFlags aState = GTK_STATE_FLAG_NORMAL) {
+ GdkRGBA color;
+ gtk_style_context_get_color(aStyle, aState, &color);
+ return GDK_RGBA_TO_NS_RGBA(color);
+}
+
+using ColorPair = nsLookAndFeel::ColorPair;
+static ColorPair GetColorPair(GtkStyleContext* aStyle,
+ GtkStateFlags aState = GTK_STATE_FLAG_NORMAL) {
+ ColorPair result;
+ result.mFg = GetTextColor(aStyle, aState);
+ result.mBg = GetBackgroundColor(aStyle, result.mFg, aState);
+ return result;
+}
+
+static bool GetNamedColorPair(GtkStyleContext* aStyle, const char* aBgName,
+ const char* aFgName, ColorPair* aPair) {
+ GdkRGBA bg, fg;
+ if (!gtk_style_context_lookup_color(aStyle, aBgName, &bg) ||
+ !gtk_style_context_lookup_color(aStyle, aFgName, &fg)) {
+ return false;
+ }
+
+ aPair->mBg = GDK_RGBA_TO_NS_RGBA(bg);
+ aPair->mFg = GDK_RGBA_TO_NS_RGBA(fg);
+
+ // If the colors are semi-transparent and the theme provides a
+ // background color, blend with them to get the "final" color, see
+ // bug 1717077.
+ if (NS_GET_A(aPair->mBg) != 255 &&
+ (gtk_style_context_lookup_color(aStyle, "bg_color", &bg) ||
+ gtk_style_context_lookup_color(aStyle, "theme_bg_color", &bg))) {
+ aPair->mBg = NS_ComposeColors(GDK_RGBA_TO_NS_RGBA(bg), aPair->mBg);
+ }
+
+ // A semi-transparent foreground color would be kinda silly, but is done
+ // for symmetry.
+ if (NS_GET_A(aPair->mFg) != 255) {
+ aPair->mFg = NS_ComposeColors(aPair->mBg, aPair->mFg);
+ }
+
+ return true;
+}
+
+static void EnsureColorPairIsOpaque(ColorPair& aPair) {
+ // Blend with white, ensuring the color is opaque, so that the UI doesn't have
+ // to care about alpha.
+ aPair.mBg = NS_ComposeColors(NS_RGB(0xff, 0xff, 0xff), aPair.mBg);
+ aPair.mFg = NS_ComposeColors(aPair.mBg, aPair.mFg);
+}
+
+static void PreferDarkerBackground(ColorPair& aPair) {
+ // We use the darker one unless the foreground isn't really a color (is all
+ // white / black / gray) and the background is, in which case we stick to what
+ // we have.
+ if (RelativeLuminanceUtils::Compute(aPair.mBg) >
+ RelativeLuminanceUtils::Compute(aPair.mFg) &&
+ (AnyColorChannelIsDifferent(aPair.mFg) ||
+ !AnyColorChannelIsDifferent(aPair.mBg))) {
+ std::swap(aPair.mBg, aPair.mFg);
+ }
+}
+
+void nsLookAndFeel::PerThemeData::Init() {
+ mName = GetGtkTheme();
+
+ mFamily = [&] {
+ if (mName.EqualsLiteral("Adwaita") || mName.EqualsLiteral("Adwaita-dark")) {
+ return ThemeFamily::Adwaita;
+ }
+ if (mName.EqualsLiteral("Breeze") || mName.EqualsLiteral("Breeze-Dark")) {
+ return ThemeFamily::Breeze;
+ }
+ if (StringBeginsWith(mName, "Yaru"_ns)) {
+ return ThemeFamily::Yaru;
+ }
+ return ThemeFamily::Unknown;
+ }();
+
+ GtkStyleContext* style;
+
+ mHighContrast = StaticPrefs::widget_content_gtk_high_contrast_enabled() &&
+ mName.Find("HighContrast"_ns) >= 0;
+
+ mPreferDarkTheme = GetPreferDarkTheme();
+
+ mIsDark = GetThemeIsDark();
+
+ GdkRGBA color;
+ // Some themes style the <trough>, while others style the <scrollbar>
+ // itself, so we look at both and compose the colors.
+ style = GetStyleContext(MOZ_GTK_SCROLLBAR_VERTICAL);
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
+ mThemedScrollbar = GDK_RGBA_TO_NS_RGBA(color);
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_BACKDROP,
+ &color);
+ mThemedScrollbarInactive = GDK_RGBA_TO_NS_RGBA(color);
+
+ style = GetStyleContext(MOZ_GTK_SCROLLBAR_TROUGH_VERTICAL);
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
+ mThemedScrollbar =
+ NS_ComposeColors(mThemedScrollbar, GDK_RGBA_TO_NS_RGBA(color));
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_BACKDROP,
+ &color);
+ mThemedScrollbarInactive =
+ NS_ComposeColors(mThemedScrollbarInactive, GDK_RGBA_TO_NS_RGBA(color));
+
+ style = GetStyleContext(MOZ_GTK_SCROLLBAR_THUMB_VERTICAL);
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
+ mThemedScrollbarThumb = GDK_RGBA_TO_NS_RGBA(color);
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_PRELIGHT,
+ &color);
+ mThemedScrollbarThumbHover = GDK_RGBA_TO_NS_RGBA(color);
+ gtk_style_context_get_background_color(
+ style, GtkStateFlags(GTK_STATE_FLAG_PRELIGHT | GTK_STATE_FLAG_ACTIVE),
+ &color);
+ mThemedScrollbarThumbActive = GDK_RGBA_TO_NS_RGBA(color);
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_BACKDROP,
+ &color);
+ mThemedScrollbarThumbInactive = GDK_RGBA_TO_NS_RGBA(color);
+
+ // Make sure that the thumb is visible, at least.
+ const bool fallbackToUnthemedColors = [&] {
+ if (!StaticPrefs::widget_gtk_theme_scrollbar_colors_enabled()) {
+ return true;
+ }
+
+ if (!ShouldHonorThemeScrollbarColors()) {
+ return true;
+ }
+ // If any of the scrollbar thumb colors are fully transparent, fall back to
+ // non-native ones.
+ if (!NS_GET_A(mThemedScrollbarThumb) ||
+ !NS_GET_A(mThemedScrollbarThumbHover) ||
+ !NS_GET_A(mThemedScrollbarThumbActive)) {
+ return true;
+ }
+ // If the thumb and track are the same color and opaque, fall back to
+ // non-native colors as well.
+ if (mThemedScrollbar == mThemedScrollbarThumb &&
+ NS_GET_A(mThemedScrollbar) == 0xff) {
+ return true;
+ }
+ return false;
+ }();
+
+ if (fallbackToUnthemedColors) {
+ if (mIsDark) {
+ // Taken from Adwaita-dark.
+ mThemedScrollbar = NS_RGB(0x31, 0x31, 0x31);
+ mThemedScrollbarInactive = NS_RGB(0x2d, 0x2d, 0x2d);
+ mThemedScrollbarThumb = NS_RGB(0xa3, 0xa4, 0xa4);
+ mThemedScrollbarThumbInactive = NS_RGB(0x59, 0x5a, 0x5a);
+ } else {
+ // Taken from Adwaita.
+ mThemedScrollbar = NS_RGB(0xce, 0xce, 0xce);
+ mThemedScrollbarInactive = NS_RGB(0xec, 0xed, 0xef);
+ mThemedScrollbarThumb = NS_RGB(0x82, 0x81, 0x7e);
+ mThemedScrollbarThumbInactive = NS_RGB(0xce, 0xcf, 0xce);
+ }
+
+ mThemedScrollbarThumbHover = ThemeColors::AdjustUnthemedScrollbarThumbColor(
+ mThemedScrollbarThumb, dom::ElementState::HOVER);
+ mThemedScrollbarThumbActive =
+ ThemeColors::AdjustUnthemedScrollbarThumbColor(
+ mThemedScrollbarThumb, dom::ElementState::ACTIVE);
+ }
+
+ // The label is not added to a parent widget, but shared for constructing
+ // different style contexts. The node hierarchy is constructed only on
+ // the label style context.
+ GtkWidget* labelWidget = gtk_label_new("M");
+ g_object_ref_sink(labelWidget);
+
+ // Window colors
+ style = GetStyleContext(MOZ_GTK_WINDOW);
+ mWindow = mDialog = GetColorPair(style);
+
+ gtk_style_context_get_border_color(style, GTK_STATE_FLAG_NORMAL, &color);
+ mMozWindowActiveBorder = GDK_RGBA_TO_NS_RGBA(color);
+
+ gtk_style_context_get_border_color(style, GTK_STATE_FLAG_INSENSITIVE, &color);
+ mMozWindowInactiveBorder = GDK_RGBA_TO_NS_RGBA(color);
+
+ style = GetStyleContext(MOZ_GTK_WINDOW_CONTAINER);
+ {
+ GtkStyleContext* labelStyle = CreateStyleForWidget(labelWidget, style);
+ GetSystemFontInfo(labelStyle, &mDefaultFontName, &mDefaultFontStyle);
+ g_object_unref(labelStyle);
+ }
+
+ // tooltip foreground and background
+ style = GetStyleContext(MOZ_GTK_TOOLTIP_BOX_LABEL);
+ mInfo.mFg = GetTextColor(style);
+ style = GetStyleContext(MOZ_GTK_TOOLTIP);
+ mInfo.mBg = GetBackgroundColor(style, mInfo.mFg);
+
+ style = GetStyleContext(MOZ_GTK_MENUITEM);
+ {
+ GtkStyleContext* accelStyle =
+ CreateStyleForWidget(gtk_accel_label_new("M"), style);
+
+ GetSystemFontInfo(accelStyle, &mMenuFontName, &mMenuFontStyle);
+
+ gtk_style_context_get_color(accelStyle, GTK_STATE_FLAG_NORMAL, &color);
+ mMenu.mFg = GetTextColor(accelStyle);
+ mGrayText = GetTextColor(accelStyle, GTK_STATE_FLAG_INSENSITIVE);
+ g_object_unref(accelStyle);
+ }
+
+ const auto effectiveTitlebarStyle =
+ HeaderBarShouldDrawContainer(MOZ_GTK_HEADER_BAR) ? MOZ_GTK_HEADERBAR_FIXED
+ : MOZ_GTK_HEADER_BAR;
+ style = GetStyleContext(effectiveTitlebarStyle);
+ {
+ mTitlebar = GetColorPair(style, GTK_STATE_FLAG_NORMAL);
+ mTitlebarInactive = GetColorPair(style, GTK_STATE_FLAG_BACKDROP);
+ mTitlebarRadius = IsSolidCSDStyleUsed() ? 0 : GetBorderRadius(style);
+ }
+
+ // We special-case the header bar color in Adwaita, Yaru and Breeze to be the
+ // titlebar color, because it looks better and matches what apps do by
+ // default, see bug 1838460.
+ //
+ // We only do this in the relevant desktop environments, however, since in
+ // other cases we don't really know if the DE's titlebars are going to match.
+ //
+ // For breeze, additionally we read the KDE colors directly, if available,
+ // since these are user-configurable.
+ //
+ // For most other themes or those in unknown DEs, we use the menubar colors.
+ //
+ // FIXME(emilio): Can we do something a bit less special-case-y?
+ const bool shouldUseTitlebarColorsForHeaderBar = [&] {
+ if (mFamily == ThemeFamily::Adwaita || mFamily == ThemeFamily::Yaru) {
+ return IsGnomeDesktopEnvironment();
+ }
+ if (mFamily == ThemeFamily::Breeze) {
+ return IsKdeDesktopEnvironment();
+ }
+ return false;
+ }();
+
+ if (shouldUseTitlebarColorsForHeaderBar) {
+ mHeaderBar = mTitlebar;
+ mHeaderBarInactive = mTitlebarInactive;
+ if (mFamily == ThemeFamily::Breeze) {
+ GetNamedColorPair(style, "theme_header_background_breeze",
+ "theme_header_foreground_breeze", &mHeaderBar);
+ GetNamedColorPair(style, "theme_header_background_backdrop_breeze",
+ "theme_header_foreground_backdrop_breeze",
+ &mHeaderBarInactive);
+ }
+ } else {
+ style = GetStyleContext(MOZ_GTK_MENUBARITEM);
+ mHeaderBar.mFg = GetTextColor(style);
+ mHeaderBarInactive.mFg = GetTextColor(style, GTK_STATE_FLAG_BACKDROP);
+
+ style = GetStyleContext(MOZ_GTK_MENUBAR);
+ mHeaderBar.mBg = GetBackgroundColor(style, mHeaderBar.mFg);
+ mHeaderBarInactive.mBg = GetBackgroundColor(style, mHeaderBarInactive.mFg,
+ GTK_STATE_FLAG_BACKDROP);
+ }
+
+ style = GetStyleContext(MOZ_GTK_MENUPOPUP);
+ mMenu.mBg = [&] {
+ nscolor color = GetBackgroundColor(style, mMenu.mFg);
+ if (NS_GET_A(color)) {
+ return color;
+ }
+ // Some themes only style menupopups with the backdrop pseudo-class. Since a
+ // context / popup menu always seems to match that, try that before giving
+ // up.
+ color = GetBackgroundColor(style, mMenu.mFg, GTK_STATE_FLAG_BACKDROP);
+ if (NS_GET_A(color)) {
+ return color;
+ }
+ // If we get here we couldn't figure out the right color to use. Rather than
+ // falling back to transparent, fall back to the window background.
+ NS_WARNING(
+ "Couldn't find menu background color, falling back to window "
+ "background");
+ return mWindow.mBg;
+ }();
+
+ style = GetStyleContext(MOZ_GTK_MENUITEM);
+ gtk_style_context_get_color(style, GTK_STATE_FLAG_PRELIGHT, &color);
+ mMenuHover.mFg = GDK_RGBA_TO_NS_RGBA(color);
+ mMenuHover.mBg = NS_ComposeColors(
+ mMenu.mBg,
+ GetBackgroundColor(style, mMenu.mFg, GTK_STATE_FLAG_PRELIGHT, mMenu.mBg));
+
+ GtkWidget* parent = gtk_fixed_new();
+ GtkWidget* window = gtk_window_new(GTK_WINDOW_POPUP);
+ GtkWidget* treeView = gtk_tree_view_new();
+ GtkWidget* linkButton = gtk_link_button_new("http://example.com/");
+ GtkWidget* menuBar = gtk_menu_bar_new();
+ GtkWidget* menuBarItem = gtk_menu_item_new();
+ GtkWidget* entry = gtk_entry_new();
+ GtkWidget* textView = gtk_text_view_new();
+
+ gtk_container_add(GTK_CONTAINER(parent), treeView);
+ gtk_container_add(GTK_CONTAINER(parent), linkButton);
+ gtk_container_add(GTK_CONTAINER(parent), menuBar);
+ gtk_menu_shell_append(GTK_MENU_SHELL(menuBar), menuBarItem);
+ gtk_container_add(GTK_CONTAINER(window), parent);
+ gtk_container_add(GTK_CONTAINER(parent), entry);
+ gtk_container_add(GTK_CONTAINER(parent), textView);
+
+ // Text colors
+ GdkRGBA bgColor;
+ // If the text window background is translucent, then the background of
+ // the textview root node is visible.
+ style = GetStyleContext(MOZ_GTK_TEXT_VIEW);
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL,
+ &bgColor);
+
+ style = GetStyleContext(MOZ_GTK_TEXT_VIEW_TEXT);
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
+ ApplyColorOver(color, &bgColor);
+ mField.mBg = GDK_RGBA_TO_NS_RGBA(bgColor);
+ gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
+ mField.mFg = GDK_RGBA_TO_NS_RGBA(color);
+ mSidebar = mField;
+
+ // Selected text and background
+ {
+ GtkStyleContext* selectionStyle =
+ GetStyleContext(MOZ_GTK_TEXT_VIEW_TEXT_SELECTION);
+ auto GrabSelectionColors = [&](GtkStyleContext* style) {
+ gtk_style_context_get_background_color(
+ style,
+ static_cast<GtkStateFlags>(GTK_STATE_FLAG_FOCUSED |
+ GTK_STATE_FLAG_SELECTED),
+ &color);
+ mSelectedText.mBg = GDK_RGBA_TO_NS_RGBA(color);
+ gtk_style_context_get_color(
+ style,
+ static_cast<GtkStateFlags>(GTK_STATE_FLAG_FOCUSED |
+ GTK_STATE_FLAG_SELECTED),
+ &color);
+ mSelectedText.mFg = GDK_RGBA_TO_NS_RGBA(color);
+ };
+ GrabSelectionColors(selectionStyle);
+ if (mSelectedText.mBg == mSelectedText.mFg) {
+ // Some old distros/themes don't properly use the .selection style, so
+ // fall back to the regular text view style.
+ GrabSelectionColors(style);
+ }
+
+ // Default selected item color is the selection background / foreground
+ // colors, but we prefer named colors, as those are more general purpose
+ // than the actual selection style, which might e.g. be too-transparent.
+ //
+ // NOTE(emilio): It's unclear which one of the theme_selected_* or the
+ // selected_* pairs should we prefer, in all themes that define both that
+ // I've found, they're always the same.
+ if (!GetNamedColorPair(style, "selected_bg_color", "selected_fg_color",
+ &mSelectedItem) &&
+ !GetNamedColorPair(style, "theme_selected_bg_color",
+ "theme_selected_fg_color", &mSelectedItem)) {
+ mSelectedItem = mSelectedText;
+ }
+
+ EnsureColorPairIsOpaque(mSelectedItem);
+
+ // In a similar fashion, default accent color is the selected item/text
+ // pair, but we also prefer named colors, if available.
+ //
+ // accent_{bg,fg}_color is not _really_ a gtk3 thing (it's a gtk4 thing),
+ // but if gtk 3 themes want to specify these we let them, see:
+ //
+ // https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/named-colors.html#accent-colors
+ if (!GetNamedColorPair(style, "accent_bg_color", "accent_fg_color",
+ &mAccent)) {
+ mAccent = mSelectedItem;
+ }
+
+ EnsureColorPairIsOpaque(mAccent);
+ PreferDarkerBackground(mAccent);
+ }
+
+ // Button text color
+ style = GetStyleContext(MOZ_GTK_BUTTON);
+ {
+ GtkStyleContext* labelStyle = CreateStyleForWidget(labelWidget, style);
+ GetSystemFontInfo(labelStyle, &mButtonFontName, &mButtonFontStyle);
+ g_object_unref(labelStyle);
+ }
+
+ gtk_style_context_get_border_color(style, GTK_STATE_FLAG_NORMAL, &color);
+ mButtonBorder = GDK_RGBA_TO_NS_RGBA(color);
+ mButton = GetColorPair(style);
+ mButtonHover = GetColorPair(style, GTK_STATE_FLAG_PRELIGHT);
+ mButtonActive = GetColorPair(style, GTK_STATE_FLAG_ACTIVE);
+ if (!NS_GET_A(mButtonHover.mBg)) {
+ mButtonHover.mBg = mWindow.mBg;
+ }
+ if (!NS_GET_A(mButtonActive.mBg)) {
+ mButtonActive.mBg = mWindow.mBg;
+ }
+
+ // Combobox text color
+ style = GetStyleContext(MOZ_GTK_COMBOBOX_ENTRY_TEXTAREA);
+ gtk_style_context_get_color(style, GTK_STATE_FLAG_NORMAL, &color);
+ mComboBoxText = GDK_RGBA_TO_NS_RGBA(color);
+
+ // GTK's guide to fancy odd row background colors:
+ // 1) Check if a theme explicitly defines an odd row color
+ // 2) If not, check if it defines an even row color, and darken it
+ // slightly by a hardcoded value (gtkstyle.c)
+ // 3) If neither are defined, take the base background color and
+ // darken that by a hardcoded value
+ style = GetStyleContext(MOZ_GTK_TREEVIEW);
+
+ // Get odd row background color
+ gtk_style_context_save(style);
+ gtk_style_context_add_region(style, GTK_STYLE_REGION_ROW, GTK_REGION_ODD);
+ gtk_style_context_get_background_color(style, GTK_STATE_FLAG_NORMAL, &color);
+ mOddCellBackground = GDK_RGBA_TO_NS_RGBA(color);
+ gtk_style_context_restore(style);
+
+ // Column header colors
+ style = GetStyleContext(MOZ_GTK_TREE_HEADER_CELL);
+ mMozColHeader = GetColorPair(style, GTK_STATE_FLAG_NORMAL);
+ mMozColHeaderHover = GetColorPair(style, GTK_STATE_FLAG_NORMAL);
+ mMozColHeaderActive = GetColorPair(style, GTK_STATE_FLAG_ACTIVE);
+
+ // Compute cell highlight colors
+ InitCellHighlightColors();
+
+ // GtkFrame has a "border" subnode on which Adwaita draws the border.
+ // Some themes do not draw on this node but draw a border on the widget
+ // root node, so check the root node if no border is found on the border
+ // node.
+ style = GetStyleContext(MOZ_GTK_FRAME_BORDER);
+ bool themeUsesColors =
+ GetBorderColors(style, &mThreeDHighlight, &mThreeDShadow);
+ if (!themeUsesColors) {
+ style = GetStyleContext(MOZ_GTK_FRAME);
+ GetBorderColors(style, &mThreeDHighlight, &mThreeDShadow);
+ }
+ mSidebarBorder = mThreeDShadow;
+
+ // Some themes have a unified menu bar, and support window dragging on it
+ gboolean supports_menubar_drag = FALSE;
+ GParamSpec* param_spec = gtk_widget_class_find_style_property(
+ GTK_WIDGET_GET_CLASS(menuBar), "window-dragging");
+ if (param_spec) {
+ if (g_type_is_a(G_PARAM_SPEC_VALUE_TYPE(param_spec), G_TYPE_BOOLEAN)) {
+ gtk_widget_style_get(menuBar, "window-dragging", &supports_menubar_drag,
+ nullptr);
+ }
+ }
+ mMenuSupportsDrag = supports_menubar_drag;
+
+ // TODO: It returns wrong color for themes which
+ // sets link color for GtkLabel only as we query
+ // GtkLinkButton style here.
+ style = gtk_widget_get_style_context(linkButton);
+ gtk_style_context_get_color(style, GTK_STATE_FLAG_LINK, &color);
+ mNativeHyperLinkText = GDK_RGBA_TO_NS_RGBA(color);
+
+ gtk_style_context_get_color(style, GTK_STATE_FLAG_VISITED, &color);
+ mNativeVisitedHyperLinkText = GDK_RGBA_TO_NS_RGBA(color);
+
+ // invisible character styles
+ guint value;
+ g_object_get(entry, "invisible-char", &value, nullptr);
+ mInvisibleCharacter = char16_t(value);
+
+ // caret styles
+ gtk_widget_style_get(entry, "cursor-aspect-ratio", &mCaretRatio, nullptr);
+
+ GetSystemFontInfo(gtk_widget_get_style_context(entry), &mFieldFontName,
+ &mFieldFontStyle);
+
+ gtk_widget_destroy(window);
+ g_object_unref(labelWidget);
+
+ if (LOGLNF_ENABLED()) {
+ LOGLNF("Initialized theme %s (%d)\n", mName.get(), mPreferDarkTheme);
+ for (auto id : MakeEnumeratedRange(ColorID::End)) {
+ nscolor color;
+ nsresult rv = GetColor(id, color);
+ LOGLNF(" * color %d: pref=%s success=%d value=%x\n", int(id),
+ GetColorPrefName(id), NS_SUCCEEDED(rv),
+ NS_SUCCEEDED(rv) ? color : 0);
+ }
+ LOGLNF(" * titlebar-radius: %d\n", mTitlebarRadius);
+ }
+}
+
+// virtual
+char16_t nsLookAndFeel::GetPasswordCharacterImpl() {
+ EnsureInit();
+ return mSystemTheme.mInvisibleCharacter;
+}
+
+bool nsLookAndFeel::GetEchoPasswordImpl() { return false; }
+
+bool nsLookAndFeel::GetDefaultDrawInTitlebar() { return sCSDAvailable; }
+
+nsXPLookAndFeel::TitlebarAction nsLookAndFeel::GetTitlebarAction(
+ TitlebarEvent aEvent) {
+ return aEvent == TitlebarEvent::Double_Click ? mDoubleClickAction
+ : mMiddleClickAction;
+}
+
+void nsLookAndFeel::GetThemeInfo(nsACString& aInfo) {
+ aInfo.Append(mSystemTheme.mName);
+ aInfo.Append(" / ");
+ aInfo.Append(mAltTheme.mName);
+}
+
+bool nsLookAndFeel::WidgetUsesImage(WidgetNodeType aNodeType) {
+ static constexpr GtkStateFlags sFlagsToCheck[]{
+ GTK_STATE_FLAG_NORMAL, GTK_STATE_FLAG_PRELIGHT,
+ GtkStateFlags(GTK_STATE_FLAG_PRELIGHT | GTK_STATE_FLAG_ACTIVE),
+ GTK_STATE_FLAG_BACKDROP, GTK_STATE_FLAG_INSENSITIVE};
+
+ GtkStyleContext* style = GetStyleContext(aNodeType);
+
+ GValue value = G_VALUE_INIT;
+ for (GtkStateFlags state : sFlagsToCheck) {
+ gtk_style_context_get_property(style, "background-image", state, &value);
+ bool hasPattern = G_VALUE_TYPE(&value) == CAIRO_GOBJECT_TYPE_PATTERN &&
+ g_value_get_boxed(&value);
+ g_value_unset(&value);
+ if (hasPattern) {
+ return true;
+ }
+ }
+ return false;
+}
+
+void nsLookAndFeel::RecordLookAndFeelSpecificTelemetry() {
+ // Gtk version we're on.
+ nsString version;
+ version.AppendPrintf("%d.%d", gtk_major_version, gtk_minor_version);
+ Telemetry::ScalarSet(Telemetry::ScalarID::WIDGET_GTK_VERSION, version);
+
+ // Whether the current Gtk theme has scrollbar buttons.
+ bool hasScrollbarButtons =
+ GetInt(LookAndFeel::IntID::ScrollArrowStyle) != eScrollArrow_None;
+ mozilla::Telemetry::ScalarSet(
+ mozilla::Telemetry::ScalarID::WIDGET_GTK_THEME_HAS_SCROLLBAR_BUTTONS,
+ hasScrollbarButtons);
+
+ // Whether the current Gtk theme uses something other than a solid color
+ // background for scrollbar parts.
+ bool scrollbarUsesImage = !ShouldHonorThemeScrollbarColors();
+ mozilla::Telemetry::ScalarSet(
+ mozilla::Telemetry::ScalarID::WIDGET_GTK_THEME_SCROLLBAR_USES_IMAGES,
+ scrollbarUsesImage);
+}
+
+bool nsLookAndFeel::ShouldHonorThemeScrollbarColors() {
+ // If the Gtk theme uses anything other than solid color backgrounds for Gtk
+ // scrollbar parts, this is a good indication that painting XUL scrollbar part
+ // elements using colors extracted from the theme won't provide good results.
+ return !WidgetUsesImage(MOZ_GTK_SCROLLBAR_VERTICAL) &&
+ !WidgetUsesImage(MOZ_GTK_SCROLLBAR_CONTENTS_VERTICAL) &&
+ !WidgetUsesImage(MOZ_GTK_SCROLLBAR_TROUGH_VERTICAL) &&
+ !WidgetUsesImage(MOZ_GTK_SCROLLBAR_THUMB_VERTICAL);
+}
+
+#undef LOGLNF
+#undef LOGLNF_ENABLED