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Telegram/SourceFiles/ui/effects/outline_segments.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 "ui/effects/outline_segments.h"
+
+namespace Ui {
+
+void PaintOutlineSegments(
+		QPainter &p,
+		QRectF ellipse,
+		const std::vector<OutlineSegment> &segments,
+		float64 fromFullProgress) {
+	Expects(!segments.empty());
+
+	p.setBrush(Qt::NoBrush);
+	const auto count = std::min(int(segments.size()), kOutlineSegmentsMax);
+	if (count == 1) {
+		p.setPen(QPen(segments.front().brush, segments.front().width));
+		p.drawEllipse(ellipse);
+		return;
+	}
+	const auto small = 160;
+	const auto full = arc::kFullLength;
+	const auto separator = (full > 1.1 * small * count)
+		? small
+		: (full / (count * 1.1));
+	const auto left = full - (separator * count);
+	const auto length = left / float64(count);
+	const auto spin = separator * (1. - fromFullProgress);
+
+	auto start = 0. + (arc::kQuarterLength + (separator / 2)) + (3. * spin);
+	auto pen = QPen(
+		segments.back().brush,
+		segments.back().width,
+		Qt::SolidLine,
+		Qt::RoundCap);
+	p.setPen(pen);
+	for (auto i = 0; i != count;) {
+		const auto &segment = segments[count - (++i)];
+		if (!segment.width) {
+			start += length + separator;
+			continue;
+		} else if (pen.brush() != segment.brush
+			|| pen.widthF() != segment.width) {
+			pen = QPen(
+				segment.brush,
+				segment.width,
+				Qt::SolidLine,
+				Qt::RoundCap);
+			p.setPen(pen);
+		}
+		const auto from = int(base::SafeRound(start));
+		const auto till = start + length;
+		auto added = spin;
+		for (; i != count;) {
+			start += length + separator;
+			const auto &next = segments[count - (++i)];
+			if (next.width) {
+				--i;
+				break;
+			}
+			added += (separator + length) * (1. - fromFullProgress);
+		}
+		p.drawArc(ellipse, from, int(base::SafeRound(till + added)) - from);
+	}
+}
+
+void PaintOutlineSegments(
+		QPainter &p,
+		QRectF rect,
+		float64 radius,
+		const std::vector<OutlineSegment> &segments) {
+	Expects(!segments.empty());
+
+	p.setBrush(Qt::NoBrush);
+	const auto count = std::min(int(segments.size()), kOutlineSegmentsMax);
+	if (count == 1 || true) {
+		p.setPen(QPen(segments.back().brush, segments.back().width));
+		p.drawRoundedRect(rect, radius, radius);
+		return;
+	}
+}
+
+QLinearGradient UnreadStoryOutlineGradient(
+		QRectF rect,
+		const QColor &c1,
+		const QColor &c2) {
+	auto result = QLinearGradient(rect.topRight(), rect.bottomLeft());
+	result.setStops({ { 0., c1 }, { 1., c2 } });
+	return result;
+}
+
+QLinearGradient UnreadStoryOutlineGradient(QRectF rect) {
+	return UnreadStoryOutlineGradient(
+		std::move(rect),
+		st::groupCallLive1->c,
+		st::groupCallMuted1->c);
+}
+
+} // namespace Ui