Invert patter image to white for dark colors.

Telegram/SourceFiles/ui/chat/chat_theme.cpp

@@ -647,6 +647,13 @@ QColor CountAverageColor(const std::vector<QColor> &colors) {
 	return QColor(components[0], components[1], components[2]);
 }
 
+bool IsPatternInverted(
+		const std::vector<QColor> &background,
+		float64 patternOpacity) {
+	return (patternOpacity > 0.)
+		&& (CountAverageColor(background).toHsv().valueF() <= 0.3);
+}
+
 QColor ThemeAdjustedColor(QColor original, QColor background) {
 	return QColor::fromHslF(
 		background.hslHueF(),
@@ -747,7 +754,7 @@ QImage GenerateBackgroundImage(
 		const std::vector<QColor> &bg,
 		int gradientRotation,
 		float64 patternOpacity,
-		Fn<void(QPainter&)> drawPattern) {
+		Fn<void(QPainter&,bool)> drawPattern) {
 	auto result = bg.empty()
 		? Images::GenerateGradient(size, { DefaultBackgroundColor() })
 		: Images::GenerateGradient(size, bg, gradientRotation);
@@ -762,7 +769,7 @@ QImage GenerateBackgroundImage(
 		} else {
 			p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
 		}
-		drawPattern(p);
+		drawPattern(p, IsPatternInverted(bg, patternOpacity));
 		if (patternOpacity < 0. && patternOpacity > -1.) {
 			p.setCompositionMode(QPainter::CompositionMode_SourceOver);
 			p.setOpacity(1. + patternOpacity);
@@ -784,7 +791,10 @@ QImage PreparePatternImage(
 		bg,
 		gradientRotation,
 		patternOpacity,
-		[&](QPainter &p) {
+		[&](QPainter &p, bool inverted) {
+			if (inverted) {
+				pattern = InvertPatternImage(std::move(pattern));
+			}
 			p.drawImage(QRect(QPoint(), pattern.size()), pattern);
 		});
 
@@ -792,6 +802,23 @@ QImage PreparePatternImage(
 	return result;
 }
 
+QImage InvertPatternImage(QImage pattern) {
+	pattern = std::move(pattern).convertToFormat(
+		QImage::Format_ARGB32_Premultiplied);
+	const auto w = pattern.bytesPerLine() / 4;
+	auto ints = reinterpret_cast<uint32*>(pattern.bits());
+	for (auto y = 0, h = pattern.height(); y != h; ++y) {
+		for (auto x = 0; x != w; ++x) {
+			const auto value = (*ints >> 24);
+			*ints++ = (value << 24)
+				| (value << 16)
+				| (value << 8)
+				| value;
+		}
+	}
+	return pattern;
+}
+
 QImage PrepareBlurredBackground(QImage image) {
 	constexpr auto kSize = 900;
 	constexpr auto kRadius = 24;
@@ -834,6 +861,8 @@ ChatThemeBackground PrepareBackgroundImage(
 				data.colors,
 				data.gradientRotation,
 				data.patternOpacity);
+		} else if (IsPatternInverted(data.colors, data.patternOpacity)) {
+			prepared = InvertPatternImage(std::move(prepared));
 		}
 		prepared.setDevicePixelRatio(style::DevicePixelRatio());
 	} else if (data.colors.empty()) {

Telegram/SourceFiles/ui/chat/chat_theme.h

@@ -184,6 +184,9 @@ struct ChatBackgroundRects {
 
 [[nodiscard]] QColor CountAverageColor(const QImage &image);
 [[nodiscard]] QColor CountAverageColor(const std::vector<QColor> &colors);
+[[nodiscard]] bool IsPatternInverted(
+	const std::vector<QColor> &background,
+	float64 patternOpacity);
 [[nodiscard]] QColor ThemeAdjustedColor(QColor original, QColor background);
 [[nodiscard]] QImage PreprocessBackgroundImage(QImage image);
 [[nodiscard]] std::optional<QColor> CalculateImageMonoColor(
@@ -199,7 +202,8 @@ struct ChatBackgroundRects {
 	const std::vector<QColor> &bg,
 	int gradientRotation,
 	float64 patternOpacity = 1.,
-	Fn<void(QPainter&)> drawPattern = nullptr);
+	Fn<void(QPainter&,bool)> drawPattern = nullptr);
+[[nodiscard]] QImage InvertPatternImage(QImage pattern);
 [[nodiscard]] QImage PreparePatternImage(
 	QImage pattern,
 	const std::vector<QColor> &bg,

Telegram/SourceFiles/window/themes/window_theme.cpp

@@ -722,6 +722,9 @@ void ChatBackground::setPreparedAfterPaper(QImage image) {
 				QImage());
 		} else {
 			image = postprocessBackgroundImage(std::move(image));
+			if (Ui::IsPatternInverted(bgColors, _paper.patternOpacity())) {
+				image = Ui::InvertPatternImage(std::move(image));
+			}
 			setPrepared(
 				image,
 				image,

Telegram/SourceFiles/window/window_main_menu.cpp

@@ -985,6 +985,9 @@ void MainMenu::refreshMenu() {
 }
 
 void MainMenu::refreshBackground() {
+	if (IsFilledCover()) {
+		return;
+	}
 	const auto fill = QSize(st::mainMenuWidth, st::mainMenuCoverHeight);
 	const auto intensityText = IntensityOfColor(st::mainMenuCoverFg->c);
 	const auto background = Window::Theme::Background();
@@ -995,14 +998,14 @@ void MainMenu::refreshBackground() {
 		fill,
 		prepared.size());
 
-	auto backgroundImage = paper.isPattern()
+	auto backgroundImage = /*paper.isPattern()
 		? Ui::GenerateBackgroundImage(
 			fill * cIntRetinaFactor(),
 			paper.backgroundColors(),
 			paper.gradientRotation(),
 			paper.patternOpacity(),
 			[&](QPainter &p) { p.drawImage(rects.to, prepared, rects.from); })
-		: QImage(
+		: */QImage(
 			fill * cIntRetinaFactor(),
 			QImage::Format_ARGB32_Premultiplied);
 	QPainter p(&backgroundImage);
@@ -1019,20 +1022,20 @@ void MainMenu::refreshBackground() {
 	};
 
 	// Solid color.
-	if (const auto color = background->colorForFill()) {
-		const auto intensity = IntensityOfColor(*color);
-		p.fillRect(QRect(QPoint(), fill), *color);
-		if (std::abs(intensity - intensityText) < kMinDiffIntensity) {
-			drawShadow(p);
-		}
-		_background = backgroundImage;
-		return;
-	}
+	//if (const auto color = background->colorForFill()) {
+	//	const auto intensity = IntensityOfColor(*color);
+	//	p.fillRect(QRect(QPoint(), fill), *color);
+	//	if (std::abs(intensity - intensityText) < kMinDiffIntensity) {
+	//		drawShadow(p);
+	//	}
+	//	_background = backgroundImage;
+	//	return;
+	//}
 
 	// Background image.
-	if (!paper.isPattern()) {
+	//if (!paper.isPattern()) {
 		p.drawImage(rects.to, prepared, rects.from);
-	}
+	//}
 
 	// Cut off the part of the background that is under text.
 	const QRect underText(