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Telegram/SourceFiles/info/userpic/info_userpic_emoji_builder_common.cpp

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "info/userpic/info_userpic_emoji_builder_common.h"
+
+#include "ui/image/image_prepare.h"
+#include "ui/userpic_view.h" // ForumUserpicRadiusMultiplier.
+
+namespace UserpicBuilder {
+
+[[nodiscard]] QImage GenerateGradient(
+		const QSize &size,
+		const std::vector<QColor> &colors,
+		bool circle,
+		bool roundForumRect) {
+	constexpr auto kRotation = int(45);
+	auto gradient = Images::GenerateGradient(size, colors, kRotation);
+	if (!circle && !roundForumRect) {
+		return gradient;
+	}
+	const auto processModifier = [&](QImage &&i) {
+		if (circle) {
+			return Images::Circle(std::move(i));
+		} else if (roundForumRect) {
+			const auto radius = std::min(i.height(), i.width())
+				* Ui::ForumUserpicRadiusMultiplier();
+			return Images::Round(
+				std::move(i),
+				Images::CornersMask(radius / style::DevicePixelRatio()));
+		} else {
+			return std::move(i);
+		}
+	};
+	if (style::DevicePixelRatio() == 1) {
+		return processModifier(std::move(gradient));
+	}
+	auto image = QImage(
+		size * style::DevicePixelRatio(),
+		QImage::Format_ARGB32_Premultiplied);
+	image.setDevicePixelRatio(style::DevicePixelRatio());
+	image.fill(Qt::transparent);
+	{
+		auto p = QPainter(&image);
+		p.drawImage(QRect(QPoint(), size), gradient);
+	}
+	return processModifier(std::move(image));
+}
+
+} // namespace UserpicBuilder