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/* -*- Mode: C++; tab-width: 40; 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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ThemeColors.h"
#include "mozilla/RelativeLuminanceUtils.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPrefs_widget.h"
#include "ThemeDrawing.h"
#include "nsNativeTheme.h"
using namespace mozilla::gfx;
namespace mozilla::widget {
struct ColorPalette {
ColorPalette(nscolor aAccent, nscolor aForeground);
constexpr ColorPalette(sRGBColor aAccent, sRGBColor aForeground,
sRGBColor aLight, sRGBColor aDark, sRGBColor aDarker)
: mAccent(aAccent),
mForeground(aForeground),
mAccentLight(aLight),
mAccentDark(aDark),
mAccentDarker(aDarker) {}
constexpr static ColorPalette Default() {
return ColorPalette(
sDefaultAccent, sDefaultAccentText,
sRGBColor::UnusualFromARGB(0x4d008deb), // Luminance: 25.04791%
sRGBColor::UnusualFromARGB(0xff0250bb), // Luminance: 9.33808%
sRGBColor::UnusualFromARGB(0xff054096) // Luminance: 5.90106%
);
}
// Ensure accent color is opaque by blending with white. This serves two
// purposes: On one hand, it avoids surprises if we overdraw. On the other, it
// makes our math below make more sense, as we want to match the browser
// style, which has an opaque accent color.
static nscolor EnsureOpaque(nscolor aAccent) {
if (NS_GET_A(aAccent) != 0xff) {
return NS_ComposeColors(NS_RGB(0xff, 0xff, 0xff), aAccent);
}
return aAccent;
}
static nscolor GetLight(nscolor aAccent) {
// The luminance from the light color divided by the one of the accent color
// in the default palette.
constexpr float kLightLuminanceScale = 25.048f / 13.693f;
const float lightLuminanceAdjust = ThemeColors::ScaleLuminanceBy(
RelativeLuminanceUtils::Compute(aAccent), kLightLuminanceScale);
nscolor lightColor =
RelativeLuminanceUtils::Adjust(aAccent, lightLuminanceAdjust);
return NS_RGBA(NS_GET_R(lightColor), NS_GET_G(lightColor),
NS_GET_B(lightColor), 0x4d);
}
static nscolor GetDark(nscolor aAccent) {
// Same deal as above (but without the alpha).
constexpr float kDarkLuminanceScale = 9.338f / 13.693f;
const float darkLuminanceAdjust = ThemeColors::ScaleLuminanceBy(
RelativeLuminanceUtils::Compute(aAccent), kDarkLuminanceScale);
return RelativeLuminanceUtils::Adjust(aAccent, darkLuminanceAdjust);
}
static nscolor GetDarker(nscolor aAccent) {
// Same deal as above.
constexpr float kDarkerLuminanceScale = 5.901f / 13.693f;
const float darkerLuminanceAdjust = ThemeColors::ScaleLuminanceBy(
RelativeLuminanceUtils::Compute(aAccent), kDarkerLuminanceScale);
return RelativeLuminanceUtils::Adjust(aAccent, darkerLuminanceAdjust);
}
sRGBColor mAccent;
sRGBColor mForeground;
// Note that depending on the exact accent color, lighter/darker might really
// be inverted.
sRGBColor mAccentLight;
sRGBColor mAccentDark;
sRGBColor mAccentDarker;
};
static nscolor GetAccentColor(bool aBackground, ColorScheme aScheme) {
auto useStandins = LookAndFeel::UseStandins(
!StaticPrefs::widget_non_native_theme_use_theme_accent());
return ColorPalette::EnsureOpaque(
LookAndFeel::Color(aBackground ? LookAndFeel::ColorID::Accentcolor
: LookAndFeel::ColorID::Accentcolortext,
aScheme, useStandins));
}
static ColorPalette sDefaultLightPalette = ColorPalette::Default();
static ColorPalette sDefaultDarkPalette = ColorPalette::Default();
ColorPalette::ColorPalette(nscolor aAccent, nscolor aForeground) {
mAccent = sRGBColor::FromABGR(aAccent);
mForeground = sRGBColor::FromABGR(aForeground);
mAccentLight = sRGBColor::FromABGR(GetLight(aAccent));
mAccentDark = sRGBColor::FromABGR(GetDark(aAccent));
mAccentDarker = sRGBColor::FromABGR(GetDarker(aAccent));
}
ThemeAccentColor::ThemeAccentColor(const ComputedStyle& aStyle,
ColorScheme aScheme)
: mDefaultPalette(aScheme == ColorScheme::Light ? &sDefaultLightPalette
: &sDefaultDarkPalette) {
const auto& color = aStyle.StyleUI()->mAccentColor;
if (color.IsAuto()) {
return;
}
MOZ_ASSERT(color.IsColor());
nscolor accentColor =
ColorPalette::EnsureOpaque(color.AsColor().CalcColor(aStyle));
if (sRGBColor::FromABGR(accentColor) == mDefaultPalette->mAccent) {
return;
}
mAccentColor.emplace(accentColor);
}
sRGBColor ThemeAccentColor::Get() const {
if (!mAccentColor) {
return mDefaultPalette->mAccent;
}
return sRGBColor::FromABGR(*mAccentColor);
}
sRGBColor ThemeAccentColor::GetForeground() const {
if (!mAccentColor) {
return mDefaultPalette->mForeground;
}
return sRGBColor::FromABGR(
ThemeColors::ComputeCustomAccentForeground(*mAccentColor));
}
sRGBColor ThemeAccentColor::GetLight() const {
if (!mAccentColor) {
return mDefaultPalette->mAccentLight;
}
return sRGBColor::FromABGR(ColorPalette::GetLight(*mAccentColor));
}
sRGBColor ThemeAccentColor::GetDark() const {
if (!mAccentColor) {
return mDefaultPalette->mAccentDark;
}
return sRGBColor::FromABGR(ColorPalette::GetDark(*mAccentColor));
}
sRGBColor ThemeAccentColor::GetDarker() const {
if (!mAccentColor) {
return mDefaultPalette->mAccentDarker;
}
return sRGBColor::FromABGR(ColorPalette::GetDarker(*mAccentColor));
}
bool ThemeColors::ShouldBeHighContrast(const nsPresContext& aPc) {
// We make sure that we're drawing backgrounds, since otherwise layout will
// darken our used text colors etc anyways, and that can cause contrast issues
// with dark high-contrast themes.
return aPc.GetBackgroundColorDraw() &&
PreferenceSheet::PrefsFor(*aPc.Document())
.NonNativeThemeShouldBeHighContrast();
}
ColorScheme ThemeColors::ColorSchemeForWidget(const nsIFrame* aFrame,
StyleAppearance aAppearance,
bool aHighContrast) {
if (!nsNativeTheme::IsWidgetScrollbarPart(aAppearance)) {
return LookAndFeel::ColorSchemeForFrame(aFrame);
}
// Scrollbars are a bit tricky. Their used color-scheme depends on whether the
// background they are on is light or dark.
//
// TODO(emilio): This heuristic effectively predates the color-scheme CSS
// property. Perhaps we should check whether the style or the document set
// `color-scheme` to something that isn't `normal`, and if so go through the
// code-path above.
if (aHighContrast) {
return ColorScheme::Light;
}
if (StaticPrefs::widget_disable_dark_scrollbar()) {
return ColorScheme::Light;
}
return nsNativeTheme::IsDarkBackgroundForScrollbar(
const_cast<nsIFrame*>(aFrame))
? ColorScheme::Dark
: ColorScheme::Light;
}
/*static*/
void ThemeColors::RecomputeAccentColors() {
MOZ_RELEASE_ASSERT(NS_IsMainThread());
sDefaultLightPalette =
ColorPalette(GetAccentColor(true, ColorScheme::Light),
GetAccentColor(false, ColorScheme::Light));
sDefaultDarkPalette = ColorPalette(GetAccentColor(true, ColorScheme::Dark),
GetAccentColor(false, ColorScheme::Dark));
}
/*static*/
nscolor ThemeColors::ComputeCustomAccentForeground(nscolor aColor) {
// Contrast ratio is defined in
//
// (L1 + 0.05) / (L2 + 0.05)
//
// Where L1 is the lighter color, and L2 is the darker one. So we determine
// whether we're dark or light and resolve the equation for the target ratio.
//
// So when lightening:
//
// L1 = k * (L2 + 0.05) - 0.05
//
// And when darkening:
//
// L2 = (L1 + 0.05) / k - 0.05
//
const float luminance = RelativeLuminanceUtils::Compute(aColor);
// We generally prefer white unless we can't because the color is really light
// and we can't provide reasonable contrast.
const float ratioWithWhite = 1.05f / (luminance + 0.05f);
const bool canBeWhite =
ratioWithWhite >=
StaticPrefs::layout_css_accent_color_min_contrast_ratio();
if (canBeWhite) {
return NS_RGB(0xff, 0xff, 0xff);
}
const float targetRatio =
StaticPrefs::layout_css_accent_color_darkening_target_contrast_ratio();
const float targetLuminance = (luminance + 0.05f) / targetRatio - 0.05f;
return RelativeLuminanceUtils::Adjust(aColor, targetLuminance);
}
nscolor ThemeColors::AdjustUnthemedScrollbarThumbColor(
nscolor aFaceColor, dom::ElementState aStates) {
// In Windows 10, scrollbar thumb has the following colors:
//
// State | Color | Luminance
// -------+----------+----------
// Normal | Gray 205 | 61.0%
// Hover | Gray 166 | 38.1%
// Active | Gray 96 | 11.7%
//
// This function is written based on the ratios between the values.
bool isActive = aStates.HasState(dom::ElementState::ACTIVE);
bool isHover = aStates.HasState(dom::ElementState::HOVER);
if (!isActive && !isHover) {
return aFaceColor;
}
float luminance = RelativeLuminanceUtils::Compute(aFaceColor);
if (isActive) {
// 11.7 / 61.0
luminance = ScaleLuminanceBy(luminance, 0.192f);
} else {
// 38.1 / 61.0
luminance = ScaleLuminanceBy(luminance, 0.625f);
}
return RelativeLuminanceUtils::Adjust(aFaceColor, luminance);
}
} // namespace mozilla::widget