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Telegram/SourceFiles/info/userpic/info_userpic_bubble_wrap.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_bubble_wrap.h"
+
+#include "ui/painter.h"
+#include "ui/rect.h"
+#include "ui/wrap/padding_wrap.h"
+#include "ui/wrap/vertical_layout.h"
+#include "styles/style_chat.h"
+#include "styles/style_info_userpic_builder.h"
+
+namespace Ui {
+namespace {
+
+void PaintExcludeTopShadow(QPainter &p, int radius, const QRect &r) {
+	constexpr auto kHorizontalOffset = 1.;
+	constexpr auto kVerticalOffset = 2.;
+	constexpr auto kOpacityStep1 = 0.2;
+	constexpr auto kOpacityStep2 = 0.4;
+	const auto opacity = p.opacity();
+	const auto hOffset = style::ConvertScale(kHorizontalOffset);
+	const auto vOffset = style::ConvertScale(kVerticalOffset);
+	p.setOpacity(opacity * kOpacityStep1);
+	p.drawRoundedRect(
+		r + QMarginsF(hOffset, -radius, hOffset, 0),
+		radius,
+		radius);
+	p.setOpacity(opacity * kOpacityStep1);
+	p.drawRoundedRect(
+		r + QMarginsF(0, 0, 0, vOffset),
+		radius,
+		radius);
+	p.setOpacity(opacity * kOpacityStep2);
+	p.drawRoundedRect(
+		r + QMarginsF(0, 0, 0, vOffset / 2.),
+		radius,
+		radius);
+	p.setOpacity(opacity);
+}
+
+} // namespace
+
+QRect BubbleWrapInnerRect(const QRect &r) {
+	return r - st::userpicBuilderEmojiBubblePadding;
+}
+
+not_null<Ui::RpWidget*> AddBubbleWrap(
+		not_null<Ui::VerticalLayout*> container,
+		const QSize &size) {
+	const auto bubble = container->add(
+		object_ptr<Ui::RpWidget>(container),
+		style::al_top);
+	bubble->resize(size);
+	bubble->setNaturalWidth(size.width());
+
+	auto cached = QImage(
+		size * style::DevicePixelRatio(),
+		QImage::Format_ARGB32_Premultiplied);
+	cached.setDevicePixelRatio(style::DevicePixelRatio());
+	cached.fill(Qt::transparent);
+	{
+		auto p = QPainter(&cached);
+		const auto innerRect = BubbleWrapInnerRect(bubble->rect());
+		auto hq = PainterHighQualityEnabler(p);
+		const auto radius = st::bubbleRadiusSmall;
+		p.setPen(Qt::NoPen);
+		p.setBrush(st::shadowFg);
+		PaintExcludeTopShadow(p, radius, innerRect);
+		p.setBrush(st::boxBg);
+		p.drawRoundedRect(innerRect, radius, radius);
+	}
+
+	bubble->paintRequest(
+	) | rpl::on_next([bubble, cached = std::move(cached)] {
+		auto p = QPainter(bubble);
+		p.drawImage(0, 0, cached);
+	}, bubble->lifetime());
+
+	return bubble;
+}
+
+} // namespace Ui