From 1894b8fcf7a576de8b4e21b5fa5b7a0cd0a8b408 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Thu, 17 Jan 2019 12:18:23 +0400
Subject: [PATCH] Handle t.me/bg links with wallpapers / colors.

---
 Telegram/Resources/langs/lang.strings         |   5 +
 Telegram/SourceFiles/apiwrap.cpp              |  54 ++-
 Telegram/SourceFiles/apiwrap.h                |  11 +
 Telegram/SourceFiles/base/binary_guard.h      |  13 +-
 .../SourceFiles/base/concurrent_timer.cpp     |   4 +-
 Telegram/SourceFiles/boxes/background_box.cpp | 327 ++++++++++++++++++
 Telegram/SourceFiles/boxes/background_box.h   |  51 +++
 .../SourceFiles/core/click_handler_types.cpp  |   9 +-
 .../SourceFiles/core/local_url_handlers.cpp   |  19 +-
 Telegram/SourceFiles/data/data_document.cpp   |  43 ++-
 Telegram/SourceFiles/data/data_document.h     |   3 +
 .../data/data_document_good_thumbnail.cpp     |   6 +-
 .../SourceFiles/data/data_file_origin.cpp     |   8 +-
 Telegram/SourceFiles/data/data_file_origin.h  |  20 +-
 Telegram/SourceFiles/data/data_web_page.cpp   |   4 +-
 Telegram/SourceFiles/mainwidget.cpp           | 129 ++++---
 Telegram/SourceFiles/mainwidget.h             |  11 +-
 Telegram/SourceFiles/mediaview.cpp            |   2 +-
 .../SourceFiles/settings/settings_chat.cpp    |  49 +--
 .../storage/cache/storage_cache_cleaner.cpp   |   2 +-
 .../storage/cache/storage_cache_compactor.cpp |   2 +-
 .../SourceFiles/storage/file_download.cpp     |   6 +-
 Telegram/SourceFiles/storage/localstorage.cpp |   2 +-
 .../SourceFiles/storage/storage_databases.cpp |   4 +-
 .../support/support_autocomplete.cpp          |   4 +-
 .../SourceFiles/support/support_templates.cpp |   4 +-
 Telegram/SourceFiles/ui/emoji_config.cpp      |   4 +-
 Telegram/SourceFiles/ui/image/image.cpp       |   5 +
 Telegram/SourceFiles/ui/image/image.h         |   2 +
 .../window/notifications_manager_default.cpp  |   2 +-
 .../SourceFiles/window/section_widget.cpp     |   4 +
 .../window/themes/window_theme.cpp            | 150 +++++---
 .../SourceFiles/window/themes/window_theme.h  |  36 +-
 .../window/themes/window_theme_editor.cpp     |   4 +-
 34 files changed, 805 insertions(+), 194 deletions(-)

diff --git a/Telegram/Resources/langs/lang.strings b/Telegram/Resources/langs/lang.strings
index 67ad7d7f5..47d1a37ea 100644
--- a/Telegram/Resources/langs/lang.strings
+++ b/Telegram/Resources/langs/lang.strings
@@ -392,6 +392,11 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_theme_reverting#other" = "Reverting to the old theme in {count} seconds.";
 "lng_theme_keep_changes" = "Keep changes";
 "lng_theme_revert" = "Revert";
+"lng_background_header" = "Background preview";
+"lng_background_text1" = "You can't swipe left or right to preview anything - this is tdesktop, sorry.";
+"lng_background_text2" = "Sounds awful.";
+"lng_background_bad_link" = "This background link appears to be invalid.";
+"lng_background_apply" = "Apply";
 
 "lng_download_path_ask" = "Ask download path for each file";
 "lng_download_path" = "Download path";
diff --git a/Telegram/SourceFiles/apiwrap.cpp b/Telegram/SourceFiles/apiwrap.cpp
index 92612f260..4d24f817b 100644
--- a/Telegram/SourceFiles/apiwrap.cpp
+++ b/Telegram/SourceFiles/apiwrap.cpp
@@ -40,6 +40,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/notifications_manager.h"
 #include "window/window_lock_widgets.h"
 #include "window/window_controller.h"
+#include "window/themes/window_theme.h"
 #include "inline_bots/inline_bot_result.h"
 #include "chat_helpers/message_field.h"
 #include "chat_helpers/stickers.h"
@@ -864,6 +865,52 @@ void ApiWrap::requestFakeChatListMessage(
 	}).send();
 }
 
+void ApiWrap::requestWallPaper(
+		const QString &slug,
+		Fn<void(const Data::WallPaper &)> done,
+		Fn<void(const RPCError &)> fail) {
+	if (_wallPaperSlug != slug) {
+		_wallPaperSlug = slug;
+		if (_wallPaperRequestId) {
+			request(base::take(_wallPaperRequestId)).cancel();
+		}
+	}
+	_wallPaperDone = std::move(done);
+	_wallPaperFail = std::move(fail);
+	if (_wallPaperRequestId) {
+		return;
+	}
+	_wallPaperRequestId = request(MTPaccount_GetWallPaper(
+		MTP_inputWallPaperSlug(MTP_string(slug))
+	)).done([=](const MTPWallPaper &result) {
+		_wallPaperRequestId = 0;
+		_wallPaperSlug = QString();
+		result.match([&](const MTPDwallPaper &data) {
+			const auto document = _session->data().document(data.vdocument);
+			if (document->checkWallPaperProperties()) {
+				if (const auto done = base::take(_wallPaperDone)) {
+					done({
+						data.vid.v,
+						data.vaccess_hash.v,
+						data.vflags.v,
+						qs(data.vslug),
+						document->thumb,
+						document
+					});
+				}
+			} else if (const auto fail = base::take(_wallPaperFail)) {
+				fail(RPCError::Local("BAD_DOCUMENT", "In a wallpaper."));
+			}
+		});
+	}).fail([=](const RPCError &error) {
+		_wallPaperRequestId = 0;
+		_wallPaperSlug = QString();
+		if (const auto fail = base::take(_wallPaperFail)) {
+			fail(error);
+		}
+	}).send();
+}
+
 void ApiWrap::requestFullPeer(not_null<PeerData*> peer) {
 	if (_fullPeerRequests.contains(peer)) {
 		return;
@@ -2829,8 +2876,11 @@ void ApiWrap::refreshFileReference(
 		request(
 			MTPmessages_GetSavedGifs(MTP_int(0)),
 			[] { crl::on_main([] { Local::writeSavedGifs(); }); });
-	}, [&](Data::FileOriginWallpapers data) {
-		request(MTPaccount_GetWallPapers(MTP_int(0)));
+	}, [&](Data::FileOriginWallpaper data) {
+		request(MTPaccount_GetWallPaper(
+			MTP_inputWallPaper(
+				MTP_long(data.paperId),
+				MTP_long(data.accessHash))));
 	}, [&](std::nullopt_t) {
 		fail();
 	});
diff --git a/Telegram/SourceFiles/apiwrap.h b/Telegram/SourceFiles/apiwrap.h
index 690bc46ad..edfd31490 100644
--- a/Telegram/SourceFiles/apiwrap.h
+++ b/Telegram/SourceFiles/apiwrap.h
@@ -26,6 +26,7 @@ class mtpFileLoader;
 
 namespace Data {
 struct UpdatedFileReferences;
+struct WallPaper;
 } // namespace Data
 
 namespace InlineBots {
@@ -92,6 +93,11 @@ public:
 	//void changeDialogUnreadMark(not_null<Data::Feed*> feed, bool unread); // #feed
 	void requestFakeChatListMessage(not_null<History*> history);
 
+	void requestWallPaper(
+		const QString &slug,
+		Fn<void(const Data::WallPaper &)> done,
+		Fn<void(const RPCError &)> fail);
+
 	void requestFullPeer(not_null<PeerData*> peer);
 	void requestPeer(not_null<PeerData*> peer);
 	void requestPeers(const QList<PeerData*> &peers);
@@ -775,4 +781,9 @@ private:
 	base::flat_map<FullMsgId, mtpRequestId> _pollCloseRequestIds;
 	base::flat_map<FullMsgId, mtpRequestId> _pollReloadRequestIds;
 
+	mtpRequestId _wallPaperRequestId = 0;
+	QString _wallPaperSlug;
+	Fn<void(const Data::WallPaper &)> _wallPaperDone;
+	Fn<void(const RPCError &)> _wallPaperFail;
+
 };
diff --git a/Telegram/SourceFiles/base/binary_guard.h b/Telegram/SourceFiles/base/binary_guard.h
index 1e5a0ee58..1c6455e1a 100644
--- a/Telegram/SourceFiles/base/binary_guard.h
+++ b/Telegram/SourceFiles/base/binary_guard.h
@@ -21,7 +21,9 @@ public:
 	~binary_guard();
 
 	bool alive() const;
-	void kill();
+
+	binary_guard &operator=(std::nullptr_t);
+	explicit operator bool() const;
 
 private:
 	void destroy();
@@ -44,15 +46,20 @@ inline binary_guard &binary_guard::operator=(binary_guard &&other) {
 	return *this;
 }
 
-inline binary_guard::~binary_guard() {
+inline binary_guard &binary_guard::operator=(std::nullptr_t) {
 	destroy();
+	return *this;
+}
+
+inline binary_guard::operator bool() const {
+	return alive();
 }
 
 inline bool binary_guard::alive() const {
 	return _bothAlive && _bothAlive->load();
 }
 
-inline void binary_guard::kill() {
+inline binary_guard::~binary_guard() {
 	destroy();
 }
 
diff --git a/Telegram/SourceFiles/base/concurrent_timer.cpp b/Telegram/SourceFiles/base/concurrent_timer.cpp
index 4f9fb82f8..03ce351a0 100644
--- a/Telegram/SourceFiles/base/concurrent_timer.cpp
+++ b/Telegram/SourceFiles/base/concurrent_timer.cpp
@@ -301,11 +301,11 @@ void ConcurrentTimer::cancelAndSchedule(int timeout) {
 		runner = _runner,
 		guard = std::move(guards.second)
 	]() mutable {
-		if (!guard.alive()) {
+		if (!guard) {
 			return;
 		}
 		runner([=, guard = std::move(guard)] {
-			if (!guard.alive()) {
+			if (!guard) {
 				return;
 			}
 			timerEvent();
diff --git a/Telegram/SourceFiles/boxes/background_box.cpp b/Telegram/SourceFiles/boxes/background_box.cpp
index 0752658d0..65f65bcd6 100644
--- a/Telegram/SourceFiles/boxes/background_box.cpp
+++ b/Telegram/SourceFiles/boxes/background_box.cpp
@@ -13,14 +13,93 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/themes/window_theme.h"
 #include "ui/effects/round_checkbox.h"
 #include "ui/image/image.h"
+#include "history/history.h"
+#include "history/history_message.h"
+#include "history/view/history_view_message.h"
 #include "auth_session.h"
+#include "apiwrap.h"
 #include "data/data_session.h"
+#include "data/data_user.h"
+#include "data/data_document.h"
+#include "boxes/confirm_box.h"
 #include "styles/style_overview.h"
+#include "styles/style_history.h"
 #include "styles/style_boxes.h"
 
 namespace {
 
 constexpr auto kBackgroundsInRow = 3;
+constexpr auto kMaxWallPaperSlugLength = 255;
+
+[[nodiscard]] bool IsValidWallPaperSlug(const QString &slug) {
+	if (slug.isEmpty() || slug.size() > kMaxWallPaperSlugLength) {
+		return false;
+	}
+	return ranges::find_if(slug, [](QChar ch) {
+		return (ch != '.')
+			&& (ch != '_')
+			&& (ch != '-')
+			&& (ch < '0' || ch > '9')
+			&& (ch < 'a' || ch > 'z')
+			&& (ch < 'A' || ch > 'Z');
+	}) == slug.end();
+}
+
+AdminLog::OwnedItem GenerateTextItem(
+		not_null<HistoryView::ElementDelegate*> delegate,
+		not_null<History*> history,
+		const QString &text,
+		bool out) {
+	Expects(history->peer->isUser());
+
+	using Flag = MTPDmessage::Flag;
+	const auto id = ServerMaxMsgId + (ServerMaxMsgId / 3) + (out ? 1 : 0);
+	const auto flags = Flag::f_entities
+		| Flag::f_from_id
+		| (out ? Flag::f_out : Flag(0));
+	const auto replyTo = 0;
+	const auto viaBotId = 0;
+	const auto item = new HistoryMessage(
+		history,
+		id,
+		flags,
+		replyTo,
+		viaBotId,
+		unixtime(),
+		out ? history->session().userId() : peerToUser(history->peer->id),
+		QString(),
+		TextWithEntities{ TextUtilities::Clean(text) });
+	return AdminLog::OwnedItem(delegate, item);
+}
+
+QImage PrepareScaledFromFull(
+		const QImage &image,
+		Images::Option blur = Images::Option(0)) {
+	const auto size = st::boxWideWidth;
+	const auto width = std::max(image.width(), 1);
+	const auto height = std::max(image.height(), 1);
+	const auto takeWidth = (width > height)
+		? (width * size / height)
+		: size;
+	const auto takeHeight = (width > height)
+		? size
+		: (height * size / width);
+	return Images::prepare(
+		image,
+		takeWidth,
+		takeHeight,
+		Images::Option::Smooth | blur,
+		size,
+		size);
+}
+
+QPixmap PrepareScaledFromThumb(ImagePtr thumb) {
+	return thumb->loaded()
+		? App::pixmapFromImageInPlace(PrepareScaledFromFull(
+			thumb->original(),
+			Images::Option::Blurred))
+		: QPixmap();
+}
 
 } // namespace
 
@@ -202,3 +281,251 @@ void BackgroundBox::Inner::mouseReleaseEvent(QMouseEvent *e) {
 }
 
 BackgroundBox::Inner::~Inner() = default;
+
+BackgroundPreviewBox::BackgroundPreviewBox(
+	QWidget*,
+	const Data::WallPaper &paper)
+: _text1(GenerateTextItem(
+	this,
+	App::history(App::user(ServiceUserId)),
+	lang(lng_background_text1),
+	false))
+, _text2(GenerateTextItem(
+	this,
+	App::history(App::user(ServiceUserId)),
+	lang(lng_background_text2),
+	true))
+, _paper(paper)
+, _radial(animation(this, &BackgroundPreviewBox::step_radial)) {
+	subscribe(Auth().downloaderTaskFinished(), [=] { update(); });
+}
+
+void BackgroundPreviewBox::prepare() {
+	setTitle(langFactory(lng_background_header));
+
+	addButton(langFactory(lng_background_apply), [=] { apply(); });
+	addButton(langFactory(lng_cancel), [=] { closeBox(); });
+
+	_scaled = PrepareScaledFromThumb(_paper.thumb);
+	checkLoadedDocument();
+
+	if (_paper.thumb && !_paper.thumb->loaded()) {
+		_paper.thumb->loadEvenCancelled(Data::FileOriginWallpaper(
+			_paper.id,
+			_paper.accessHash));
+	}
+	if (_paper.document) {
+		_paper.document->save(Data::FileOriginWallpaper(
+			_paper.id,
+			_paper.accessHash), QString());
+		if (_paper.document->loading()) {
+			_radial.start(_paper.document->progress());
+		}
+	}
+
+	_text1->setDisplayDate(true);
+	_text1->initDimensions();
+	_text1->resizeGetHeight(st::boxWideWidth);
+	_text2->initDimensions();
+	_text2->resizeGetHeight(st::boxWideWidth);
+
+	setDimensions(st::boxWideWidth, st::boxWideWidth);
+}
+
+void BackgroundPreviewBox::apply() {
+	App::main()->setChatBackground(_paper, std::move(_full));
+	closeBox();
+}
+
+void BackgroundPreviewBox::paintEvent(QPaintEvent *e) {
+	Painter p(this);
+
+	const auto ms = getms();
+
+	if (const auto color = Window::Theme::GetWallPaperColor(_paper.slug)) {
+		p.fillRect(e->rect(), *color);
+	} else {
+		if (_scaled.isNull()) {
+			_scaled = PrepareScaledFromThumb(_paper.thumb);
+			if (_scaled.isNull()) {
+				p.fillRect(e->rect(), st::boxBg);
+				return;
+			}
+		}
+		paintImage(p);
+		paintRadial(p, ms);
+	}
+	paintTexts(p, ms);
+}
+
+void BackgroundPreviewBox::paintImage(Painter &p) {
+	Expects(!_scaled.isNull());
+
+	const auto factor = cIntRetinaFactor();
+	const auto size = st::boxWideWidth;
+	const auto from = QRect(
+		0,
+		(size - height()) / 2 * factor,
+		size * factor,
+		height() * factor);
+	p.drawPixmap(rect(), _scaled, from);
+}
+
+void BackgroundPreviewBox::paintRadial(Painter &p, TimeMs ms) {
+	bool radial = false;
+	float64 radialOpacity = 0;
+	if (_radial.animating()) {
+		_radial.step(ms);
+		radial = _radial.animating();
+		radialOpacity = _radial.opacity();
+	}
+	if (!radial) {
+		return;
+	}
+	auto inner = radialRect();
+
+	p.setPen(Qt::NoPen);
+	p.setOpacity(radialOpacity);
+	p.setBrush(st::radialBg);
+
+	{
+		PainterHighQualityEnabler hq(p);
+		p.drawEllipse(inner);
+	}
+
+	p.setOpacity(1);
+	QRect arc(inner.marginsRemoved(QMargins(st::radialLine, st::radialLine, st::radialLine, st::radialLine)));
+	_radial.draw(p, arc, st::radialLine, st::radialFg);
+}
+
+QRect BackgroundPreviewBox::radialRect() const {
+	const auto available = height()
+		- st::historyPaddingBottom
+		- _text1->height()
+		- _text2->height()
+		- st::historyPaddingBottom;
+	return QRect(
+		QPoint(
+			(width() - st::radialSize.width()) / 2,
+			(available - st::radialSize.height()) / 2),
+		st::radialSize);
+}
+
+void BackgroundPreviewBox::paintTexts(Painter &p, TimeMs ms) {
+	const auto height1 = _text1->height();
+	const auto height2 = _text2->height();
+	const auto top = height()
+		- height1
+		- height2
+		- st::historyPaddingBottom;
+	p.translate(0, top);
+	_text1->draw(p, rect(), TextSelection(), ms);
+	p.translate(0, height1);
+	_text2->draw(p, rect(), TextSelection(), ms);
+	p.translate(0, height2);
+}
+
+void BackgroundPreviewBox::step_radial(TimeMs ms, bool timer) {
+	Expects(_paper.document != nullptr);
+
+	const auto document = _paper.document;
+	const auto wasAnimating = _radial.animating();
+	const auto updated = _radial.update(
+		document->progress(),
+		!document->loading(),
+		ms);
+	if (timer
+		&& (wasAnimating || _radial.animating())
+		&& (!anim::Disabled() || updated)) {
+		update(radialRect());
+	}
+	checkLoadedDocument();
+}
+
+void BackgroundPreviewBox::checkLoadedDocument() {
+	const auto document = _paper.document;
+	if (!document
+		|| !document->loaded(DocumentData::FilePathResolveChecked)
+		|| _generating) {
+		return;
+	}
+	_generating = Data::ReadImageAsync(document, [=](
+			QImage &&image) mutable {
+		auto [left, right] = base::make_binary_guard();
+		_generating = std::move(left);
+		crl::async([
+			this,
+			image = std::move(image),
+			guard = std::move(right)
+		]() mutable {
+			auto scaled = PrepareScaledFromFull(image);
+			crl::on_main([
+				this,
+				image = std::move(image),
+				scaled = std::move(scaled),
+				guard = std::move(guard)
+			]() mutable {
+				if (!guard) {
+					return;
+				}
+				_scaled = App::pixmapFromImageInPlace(std::move(scaled));
+				_full = std::move(image);
+				update();
+			});
+		});
+	});
+}
+
+bool BackgroundPreviewBox::Start(const QString &slug, const QString &mode) {
+	if (Window::Theme::GetWallPaperColor(slug)) {
+		Ui::show(Box<BackgroundPreviewBox>(Data::WallPaper{
+			Window::Theme::kCustomBackground,
+			0ULL, // accessHash
+			MTPDwallPaper::Flags(0),
+			slug,
+		}));
+		return true;
+	}
+	if (!IsValidWallPaperSlug(slug)) {
+		Ui::show(Box<InformBox>(lang(lng_background_bad_link)));
+		return false;
+	}
+	Auth().api().requestWallPaper(slug, [](const Data::WallPaper &result) {
+		Ui::show(Box<BackgroundPreviewBox>(result));
+	}, [](const RPCError &error) {
+		Ui::show(Box<InformBox>(lang(lng_background_bad_link)));
+	});
+	return true;
+}
+
+HistoryView::Context BackgroundPreviewBox::elementContext() {
+	return HistoryView::Context::ContactPreview;
+}
+
+std::unique_ptr<HistoryView::Element> BackgroundPreviewBox::elementCreate(
+		not_null<HistoryMessage*> message) {
+	return std::make_unique<HistoryView::Message>(this, message);
+}
+
+std::unique_ptr<HistoryView::Element> BackgroundPreviewBox::elementCreate(
+		not_null<HistoryService*> message) {
+	Unexpected("Service message in BackgroundPreviewBox.");
+}
+
+bool BackgroundPreviewBox::elementUnderCursor(
+		not_null<const Element*> view) {
+	return false;
+}
+
+void BackgroundPreviewBox::elementAnimationAutoplayAsync(
+	not_null<const Element*> element) {
+}
+
+TimeMs BackgroundPreviewBox::elementHighlightTime(
+		not_null<const Element*> element) {
+	return TimeMs();
+}
+
+bool BackgroundPreviewBox::elementInSelectionMode() {
+	return false;
+}
diff --git a/Telegram/SourceFiles/boxes/background_box.h b/Telegram/SourceFiles/boxes/background_box.h
index 3b217b65c..eb84e0314 100644
--- a/Telegram/SourceFiles/boxes/background_box.h
+++ b/Telegram/SourceFiles/boxes/background_box.h
@@ -7,7 +7,12 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #pragma once
 
+#include "base/binary_guard.h"
 #include "boxes/abstract_box.h"
+#include "window/themes/window_theme.h"
+#include "history/admin_log/history_admin_log_item.h"
+#include "history/view/history_view_element.h"
+#include "ui/effects/radial_animation.h"
 
 namespace Ui {
 class RoundCheckbox;
@@ -27,3 +32,49 @@ private:
 	QPointer<Inner> _inner;
 
 };
+
+class BackgroundPreviewBox
+	: public BoxContent
+	, public HistoryView::ElementDelegate {
+public:
+	BackgroundPreviewBox(QWidget*, const Data::WallPaper &paper);
+
+	static bool Start(const QString &slug, const QString &mode);
+
+	using Element = HistoryView::Element;
+	HistoryView::Context elementContext() override;
+	std::unique_ptr<Element> elementCreate(
+		not_null<HistoryMessage*> message) override;
+	std::unique_ptr<Element> elementCreate(
+		not_null<HistoryService*> message) override;
+	bool elementUnderCursor(not_null<const Element*> view) override;
+	void elementAnimationAutoplayAsync(
+		not_null<const Element*> element) override;
+	TimeMs elementHighlightTime(
+		not_null<const Element*> element) override;
+	bool elementInSelectionMode() override;
+
+protected:
+	void prepare() override;
+
+	void paintEvent(QPaintEvent *e) override;
+
+private:
+	void apply();
+	void step_radial(TimeMs ms, bool timer);
+	QRect radialRect() const;
+
+	void checkLoadedDocument();
+	void paintImage(Painter &p);
+	void paintRadial(Painter &p, TimeMs ms);
+	void paintTexts(Painter &p, TimeMs ms);
+
+	AdminLog::OwnedItem _text1;
+	AdminLog::OwnedItem _text2;
+	Data::WallPaper _paper;
+	QImage _full;
+	QPixmap _scaled;
+	Ui::RadialAnimation _radial;
+	base::binary_guard _generating;
+
+};
diff --git a/Telegram/SourceFiles/core/click_handler_types.cpp b/Telegram/SourceFiles/core/click_handler_types.cpp
index 86c0b6ada..edb8e2322 100644
--- a/Telegram/SourceFiles/core/click_handler_types.cpp
+++ b/Telegram/SourceFiles/core/click_handler_types.cpp
@@ -44,7 +44,7 @@ QString tryConvertUrlToLocal(QString url) {
 			return qsl("tg://msg_url?") + shareUrlMatch->captured(1);
 		} else if (auto confirmPhoneMatch = regex_match(qsl("^confirmphone/?\\?(.+)"), query, matchOptions)) {
 			return qsl("tg://confirmphone?") + confirmPhoneMatch->captured(1);
-		} else if (auto ivMatch = regex_match(qsl("iv/?\\?(.+)(#|$)"), query, matchOptions)) {
+		} else if (auto ivMatch = regex_match(qsl("^iv/?\\?(.+)(#|$)"), query, matchOptions)) {
 			//
 			// We need to show our t.me page, not the url directly.
 			//
@@ -55,10 +55,13 @@ QString tryConvertUrlToLocal(QString url) {
 			//	return previewedUrl;
 			//}
 			return url;
-		} else if (auto socksMatch = regex_match(qsl("socks/?\\?(.+)(#|$)"), query, matchOptions)) {
+		} else if (auto socksMatch = regex_match(qsl("^socks/?\\?(.+)(#|$)"), query, matchOptions)) {
 			return qsl("tg://socks?") + socksMatch->captured(1);
-		} else if (auto proxyMatch = regex_match(qsl("proxy/?\\?(.+)(#|$)"), query, matchOptions)) {
+		} else if (auto proxyMatch = regex_match(qsl("^proxy/?\\?(.+)(#|$)"), query, matchOptions)) {
 			return qsl("tg://proxy?") + proxyMatch->captured(1);
+		} else if (auto bgMatch = regex_match(qsl("^bg/([a-zA-Z0-9\\.\\_\\-]+)(\\?(.+)?)?$"), query, matchOptions)) {
+			const auto params = bgMatch->captured(3);
+			return qsl("tg://bg?slug=") + bgMatch->captured(1) + (params.isEmpty() ? QString() : '&' + params);
 		} else if (auto usernameMatch = regex_match(qsl("^([a-zA-Z0-9\\.\\_]+)(/?\\?|/?$|/(\\d+)/?(?:\\?|$))"), query, matchOptions)) {
 			auto params = query.mid(usernameMatch->captured(0).size()).toString();
 			auto postParam = QString();
diff --git a/Telegram/SourceFiles/core/local_url_handlers.cpp b/Telegram/SourceFiles/core/local_url_handlers.cpp
index b4bfe00a4..8d76edbc0 100644
--- a/Telegram/SourceFiles/core/local_url_handlers.cpp
+++ b/Telegram/SourceFiles/core/local_url_handlers.cpp
@@ -13,6 +13,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "lang/lang_keys.h"
 #include "core/update_checker.h"
 #include "boxes/confirm_phone_box.h"
+#include "boxes/background_box.h"
 #include "boxes/confirm_box.h"
 #include "boxes/share_box.h"
 #include "boxes/connection_box.h"
@@ -162,11 +163,23 @@ bool ShowPassport(const Match &match, const QVariant &context) {
 		qthelp::UrlParamNameTransform::ToLower));
 }
 
+bool ShowWallPaper(const Match &match, const QVariant &context) {
+	if (!AuthSession::Exists()) {
+		return false;
+	}
+	const auto params = url_parse_params(
+		match->captured(1),
+		qthelp::UrlParamNameTransform::ToLower);
+	return BackgroundPreviewBox::Start(
+		params.value(qsl("slug")),
+		params.value(qsl("mode")));
+}
+
 bool ResolveUsername(const Match &match, const QVariant &context) {
 	if (!AuthSession::Exists()) {
 		return false;
 	}
-	auto params = url_parse_params(
+	const auto params = url_parse_params(
 		match->captured(1),
 		qthelp::UrlParamNameTransform::ToLower);
 	const auto domain = params.value(qsl("domain"));
@@ -280,6 +293,10 @@ const std::vector<LocalUrlHandler> &LocalUrlHandlers() {
 			qsl("^passport/?\\?(.+)(#|$)"),
 			ShowPassport
 		},
+		{
+			qsl("^bg/?\\?(.+)(#|$)"),
+			ShowWallPaper
+		},
 		{
 			qsl("^resolve/?\\?(.+)(#|$)"),
 			ResolveUsername
diff --git a/Telegram/SourceFiles/data/data_document.cpp b/Telegram/SourceFiles/data/data_document.cpp
index 0cd774e72..39e53d404 100644
--- a/Telegram/SourceFiles/data/data_document.cpp
+++ b/Telegram/SourceFiles/data/data_document.cpp
@@ -382,7 +382,8 @@ void DocumentOpenClickHandler::Open(
 	if (data->status != FileReady) return;
 
 	QString filename;
-	if (!data->saveToCache()) {
+	if (!data->saveToCache()
+		|| (location.isEmpty() || (!data->data().isEmpty()))) {
 		filename = documentSaveFilename(data);
 		if (filename.isEmpty()) return;
 	}
@@ -575,6 +576,9 @@ void DocumentData::setattributes(const QVector<MTPDocumentAttribute> &attributes
 }
 
 bool DocumentData::checkWallPaperProperties() {
+	if (type == WallPaperDocument) {
+		return true;
+	}
 	if (type != FileDocument
 		|| !thumb
 		|| !dimensions.width()
@@ -1301,6 +1305,8 @@ uint8 DocumentData::cacheTag() const {
 		return Data::kVideoMessageCacheTag;
 	} else if (isAnimation()) {
 		return Data::kAnimationCacheTag;
+	} else if (type == WallPaperDocument) {
+		return Data::kImageCacheTag;
 	}
 	return 0;
 }
@@ -1526,4 +1532,39 @@ paf pif ps1 reg rgs scr sct shb shs u3p vb vbe vbs vbscript ws wsf");
 		FileExtension(filepath).toLower());
 }
 
+base::binary_guard ReadImageAsync(
+		not_null<DocumentData*> document,
+		FnMut<void(QImage&&)> done) {
+	auto [left, right] = base::make_binary_guard();
+	crl::async([
+		bytes = document->data(),
+		path = document->filepath(),
+		guard = std::move(left),
+		callback = std::move(done)
+	]() mutable {
+		auto format = QByteArray();
+		if (bytes.isEmpty()) {
+			QFile f(path);
+			if (f.size() <= App::kImageSizeLimit
+				&& f.open(QIODevice::ReadOnly)) {
+				bytes = f.readAll();
+			}
+		}
+		auto image = bytes.isEmpty()
+			? QImage()
+			: App::readImage(bytes, &format, false, nullptr);
+		crl::on_main([
+			guard = std::move(guard),
+			image = std::move(image),
+			callback = std::move(callback)
+		]() mutable {
+			if (!guard) {
+				return;
+			}
+			callback(std::move(image));
+		});
+	});
+	return std::move(right);
+}
+
 } // namespace Data
diff --git a/Telegram/SourceFiles/data/data_document.h b/Telegram/SourceFiles/data/data_document.h
index bb91c7a9d..e5186ba49 100644
--- a/Telegram/SourceFiles/data/data_document.h
+++ b/Telegram/SourceFiles/data/data_document.h
@@ -340,5 +340,8 @@ namespace Data {
 QString FileExtension(const QString &filepath);
 bool IsValidMediaFile(const QString &filepath);
 bool IsExecutableName(const QString &filepath);
+base::binary_guard ReadImageAsync(
+	not_null<DocumentData*> document,
+	FnMut<void(QImage&&)> done);
 
 } // namespace Data
diff --git a/Telegram/SourceFiles/data/data_document_good_thumbnail.cpp b/Telegram/SourceFiles/data/data_document_good_thumbnail.cpp
index 806e1ea75..d328c2fd1 100644
--- a/Telegram/SourceFiles/data/data_document_good_thumbnail.cpp
+++ b/Telegram/SourceFiles/data/data_document_good_thumbnail.cpp
@@ -25,7 +25,7 @@ GoodThumbSource::GoodThumbSource(not_null<DocumentData*> document)
 }
 
 void GoodThumbSource::generate(base::binary_guard &&guard) {
-	if (!guard.alive()) {
+	if (!guard) {
 		return;
 	}
 	const auto data = _document->data();
@@ -74,7 +74,7 @@ void GoodThumbSource::ready(
 		image = std::move(image),
 		bytes = std::move(bytesForCache)
 	]() mutable {
-		if (!guard.alive()) {
+		if (!guard) {
 			return;
 		}
 		if (image.isNull()) {
@@ -162,7 +162,7 @@ bool GoodThumbSource::displayLoading() {
 }
 
 void GoodThumbSource::cancel() {
-	_loading.kill();
+	_loading = nullptr;
 }
 
 float64 GoodThumbSource::progress() {
diff --git a/Telegram/SourceFiles/data/data_file_origin.cpp b/Telegram/SourceFiles/data/data_file_origin.cpp
index 3321eb61e..704e3a23f 100644
--- a/Telegram/SourceFiles/data/data_file_origin.cpp
+++ b/Telegram/SourceFiles/data/data_file_origin.cpp
@@ -178,12 +178,6 @@ struct FileReferenceAccumulator {
 		}, [](const MTPDmessages_savedGifsNotModified &data) {
 		});
 	}
-	void push(const MTPaccount_WallPapers &data) {
-		data.match([&](const MTPDaccount_wallPapers &data) {
-			push(data.vwallpapers);
-		}, [](const MTPDaccount_wallPapersNotModified &) {
-		});
-	}
 
 	UpdatedFileReferences result;
 };
@@ -248,7 +242,7 @@ UpdatedFileReferences GetFileReferences(const MTPmessages_SavedGifs &data) {
 	return GetFileReferencesHelper(data);
 }
 
-UpdatedFileReferences GetFileReferences(const MTPaccount_WallPapers &data) {
+UpdatedFileReferences GetFileReferences(const MTPWallPaper &data) {
 	return GetFileReferencesHelper(data);
 }
 
diff --git a/Telegram/SourceFiles/data/data_file_origin.h b/Telegram/SourceFiles/data/data_file_origin.h
index d4226c7c3..e94805559 100644
--- a/Telegram/SourceFiles/data/data_file_origin.h
+++ b/Telegram/SourceFiles/data/data_file_origin.h
@@ -60,9 +60,17 @@ struct FileOriginSavedGifs {
 	}
 };
 
-struct FileOriginWallpapers {
-	inline bool operator<(const FileOriginWallpapers &) const {
-		return false;
+struct FileOriginWallpaper {
+	FileOriginWallpaper(uint64 paperId, uint64 accessHash)
+	: paperId(paperId)
+	, accessHash(accessHash) {
+	}
+
+	uint64 paperId = 0;
+	uint64 accessHash = 0;
+
+	inline bool operator<(const FileOriginWallpaper &other) const {
+		return paperId < other.paperId;
 	}
 };
 
@@ -73,7 +81,7 @@ struct FileOrigin {
 		FileOriginPeerPhoto,
 		FileOriginStickerSet,
 		FileOriginSavedGifs,
-		FileOriginWallpapers>;
+		FileOriginWallpaper>;
 
 	FileOrigin() = default;
 	FileOrigin(FileOriginMessage data) : data(data) {
@@ -86,7 +94,7 @@ struct FileOrigin {
 	}
 	FileOrigin(FileOriginSavedGifs data) : data(data) {
 	}
-	FileOrigin(FileOriginWallpapers data) : data(data) {
+	FileOrigin(FileOriginWallpaper data) : data(data) {
 	}
 
 	explicit operator bool() const {
@@ -130,6 +138,6 @@ UpdatedFileReferences GetFileReferences(
 	const MTPmessages_FavedStickers &data);
 UpdatedFileReferences GetFileReferences(const MTPmessages_StickerSet &data);
 UpdatedFileReferences GetFileReferences(const MTPmessages_SavedGifs &data);
-UpdatedFileReferences GetFileReferences(const MTPaccount_WallPapers &data);
+UpdatedFileReferences GetFileReferences(const MTPWallPaper &data);
 
 } // namespace Data
diff --git a/Telegram/SourceFiles/data/data_web_page.cpp b/Telegram/SourceFiles/data/data_web_page.cpp
index 4a783f9a8..fcbe56215 100644
--- a/Telegram/SourceFiles/data/data_web_page.cpp
+++ b/Telegram/SourceFiles/data/data_web_page.cpp
@@ -133,7 +133,7 @@ WebPageType ParseWebPageType(const MTPDwebPage &page) {
 	if (type == qstr("photo")) return WebPageType::Photo;
 	if (type == qstr("video")) return WebPageType::Video;
 	if (type == qstr("profile")) return WebPageType::Profile;
-	if (type == qstr("telegram_wallpaper")) return WebPageType::WallPaper;
+	if (type == qstr("telegram_background")) return WebPageType::WallPaper;
 	return page.has_cached_page()
 		? WebPageType::ArticleWithIV
 		: WebPageType::Article;
@@ -218,7 +218,7 @@ bool WebPageData::applyChanges(
 	pendingTill = newPendingTill;
 	++version;
 
-	if (type == WebPageType::WallPaper) {
+	if (type == WebPageType::WallPaper && document) {
 		document->checkWallPaperProperties();
 	}
 
diff --git a/Telegram/SourceFiles/mainwidget.cpp b/Telegram/SourceFiles/mainwidget.cpp
index 659c158b5..9176352cf 100644
--- a/Telegram/SourceFiles/mainwidget.cpp
+++ b/Telegram/SourceFiles/mainwidget.cpp
@@ -926,7 +926,9 @@ bool MainWidget::sendMessageFail(const RPCError &error) {
 }
 
 void MainWidget::onCacheBackground() {
-	if (Window::Theme::Background()->tile()) {
+	if (Window::Theme::Background()->color()) {
+		return;
+	} else if (Window::Theme::Background()->tile()) {
 		auto &bg = Window::Theme::Background()->pixmapForTiled();
 
 		auto result = QImage(_willCacheFor.width() * cIntRetinaFactor(), _willCacheFor.height() * cIntRetinaFactor(), QImage::Format_RGB32);
@@ -1418,17 +1420,23 @@ void MainWidget::updateScrollColors() {
 	_history->updateScrollColors();
 }
 
-void MainWidget::setChatBackground(const Data::WallPaper &background) {
+void MainWidget::setChatBackground(
+		const Data::WallPaper &background,
+		QImage &&image) {
+	using namespace Window::Theme;
+
+	if (isReadyChatBackground(background, image)) {
+		setReadyChatBackground(background, std::move(image));
+		return;
+	}
+
 	_background = std::make_unique<SettingBackground>();
 	_background->data = background;
-	if (_background->data.document) {
-		_background->data.document->save(
-			Data::FileOriginWallpapers(),
-			QString());
-	} else if (_background->data.thumb) {
-		_background->data.thumb->loadEvenCancelled(
-			Data::FileOriginWallpapers());
-	}
+	_background->data.document->save(
+		Data::FileOriginWallpaper(
+			_background->data.id,
+			_background->data.accessHash),
+		QString());
 	checkChatBackground();
 
 	const auto tile = (background.id == Window::Theme::kInitialBackground);
@@ -1436,13 +1444,47 @@ void MainWidget::setChatBackground(const Data::WallPaper &background) {
 	Window::Theme::Background()->notify(Update(Update::Type::Start, tile));
 }
 
+bool MainWidget::isReadyChatBackground(
+		const Data::WallPaper &background,
+		const QImage &image) const {
+	return !image.isNull()
+		|| !background.document
+		|| Window::Theme::GetWallPaperColor(background.slug);
+}
+
+void MainWidget::setReadyChatBackground(
+		const Data::WallPaper &background,
+		QImage &&image) {
+	using namespace Window::Theme;
+
+	if (image.isNull()
+		&& !background.document
+		&& background.thumb
+		&& background.thumb->loaded()) {
+		image = background.thumb->pixNoCache(Data::FileOrigin()).toImage();
+	}
+
+	const auto resetToDefault = image.isNull()
+		&& !background.document
+		&& !GetWallPaperColor(background.slug)
+		&& (background.id != kInitialBackground);
+	const auto ready = resetToDefault
+		? Data::WallPaper{ kDefaultBackground }
+		: background;
+
+	Background()->setImage(ready, std::move(image));
+	const auto tile = (ready.id == kInitialBackground);
+	Background()->setTile(tile);
+	Ui::ForceFullRepaint(this);
+}
+
 bool MainWidget::chatBackgroundLoading() {
 	return (_background != nullptr);
 }
 
 float64 MainWidget::chatBackgroundProgress() const {
 	if (_background) {
-		if (_background->generating.alive()) {
+		if (_background->generating) {
 			return 1.;
 		} else if (_background->data.document) {
 			return _background->data.document->progress();
@@ -1454,7 +1496,7 @@ float64 MainWidget::chatBackgroundProgress() const {
 }
 
 void MainWidget::checkChatBackground() {
-	if (!_background || _background->generating.alive()) {
+	if (!_background || _background->generating) {
 		return;
 	}
 	const auto document = _background->data.document;
@@ -1464,42 +1506,13 @@ void MainWidget::checkChatBackground() {
 		return;
 	}
 
-	if (!document) {
-		const auto &thumb = _background->data.thumb;
-		setGeneratedBackground(thumb
-			? thumb->pixNoCache(Data::FileOrigin()).toImage()
-			: QImage());
-		return;
-	}
-	auto [left, right] = base::make_binary_guard();
-	_background->generating = std::move(left);
-	crl::async([
-		this,
-		bytes = document->data(),
-		path = document->filepath(),
-		guard = std::move(right)
-	]() mutable {
-		auto format = QByteArray();
-		if (bytes.isEmpty()) {
-			QFile f(path);
-			if (f.size() <= App::kImageSizeLimit
-				&& f.open(QIODevice::ReadOnly)) {
-				bytes = f.readAll();
-			}
-		}
-		auto image = bytes.isEmpty()
-			? QImage()
-			: App::readImage(bytes, &format, false, nullptr);
-		crl::on_main([
-			this,
-			guard = std::move(guard),
-			image = std::move(image)
-		]() mutable {
-			if (!guard.alive()) {
-				return;
-			}
-			setGeneratedBackground(std::move(image));
-		});
+	_background->generating = Data::ReadImageAsync(document, [=](
+			QImage &&image) {
+		const auto background = base::take(_background);
+		const auto ready = image.isNull()
+			? Data::WallPaper{ Window::Theme::kDefaultBackground }
+			: background->data;
+		setChatBackground(ready, std::move(image));
 	});
 }
 
@@ -1507,26 +1520,6 @@ ImagePtr MainWidget::newBackgroundThumb() {
 	return _background ? _background->data.thumb : ImagePtr();
 }
 
-void MainWidget::setGeneratedBackground(QImage &&image) {
-	using namespace Window::Theme;
-
-	if (image.isNull()) {
-		Background()->setImage({ kDefaultBackground });
-	} else if (false
-		|| _background->data.id == kInitialBackground
-		|| _background->data.id == kDefaultBackground) {
-		Background()->setImage(_background->data);
-	} else {
-		Background()->setImage(
-			_background->data,
-			std::move(image));
-	}
-	const auto tile = (_background->data.id == kInitialBackground);
-	Background()->setTile(tile);
-	_background = nullptr;
-	crl::on_main(this, [=] { update(); });
-}
-
 void MainWidget::messageDataReceived(ChannelData *channel, MsgId msgId) {
 	_history->messageDataReceived(channel, msgId);
 }
diff --git a/Telegram/SourceFiles/mainwidget.h b/Telegram/SourceFiles/mainwidget.h
index 374b6c14d..dab9e9ec5 100644
--- a/Telegram/SourceFiles/mainwidget.h
+++ b/Telegram/SourceFiles/mainwidget.h
@@ -227,7 +227,9 @@ public:
 	QPixmap cachedBackground(const QRect &forRect, int &x, int &y);
 	void updateScrollColors();
 
-	void setChatBackground(const Data::WallPaper &background);
+	void setChatBackground(
+		const Data::WallPaper &background,
+		QImage &&image = QImage());
 	bool chatBackgroundLoading();
 	float64 chatBackgroundProgress() const;
 	void checkChatBackground();
@@ -454,7 +456,12 @@ private:
 	void ensureFirstColumnResizeAreaCreated();
 	void ensureThirdColumnResizeAreaCreated();
 
-	void setGeneratedBackground(QImage &&image);
+	bool isReadyChatBackground(
+		const Data::WallPaper &background,
+		const QImage &image) const;
+	void setReadyChatBackground(
+		const Data::WallPaper &background,
+		QImage &&image);
 
 	not_null<Window::Controller*> _controller;
 	bool _started = false;
diff --git a/Telegram/SourceFiles/mediaview.cpp b/Telegram/SourceFiles/mediaview.cpp
index 74e546fb1..51d7db50e 100644
--- a/Telegram/SourceFiles/mediaview.cpp
+++ b/Telegram/SourceFiles/mediaview.cpp
@@ -1840,7 +1840,7 @@ void MediaView::initThemePreview() {
 
 		Window::Theme::CurrentData current;
 		current.backgroundId = Window::Theme::Background()->id();
-		current.backgroundImage = Window::Theme::Background()->pixmap().toImage();
+		current.backgroundImage = Window::Theme::Background()->createCurrentImage();
 		current.backgroundTiled = Window::Theme::Background()->tile();
 
 		const auto path = _doc->location().name();
diff --git a/Telegram/SourceFiles/settings/settings_chat.cpp b/Telegram/SourceFiles/settings/settings_chat.cpp
index 3813496e3..cefbd2c49 100644
--- a/Telegram/SourceFiles/settings/settings_chat.cpp
+++ b/Telegram/SourceFiles/settings/settings_chat.cpp
@@ -265,26 +265,35 @@ void BackgroundRow::updateImage() {
 		Painter p(&back);
 		PainterHighQualityEnabler hq(p);
 
-		const auto &pix = Window::Theme::Background()->pixmap();
-		const auto sx = (pix.width() > pix.height())
-			? ((pix.width() - pix.height()) / 2)
-			: 0;
-		const auto sy = (pix.height() > pix.width())
-			? ((pix.height() - pix.width()) / 2)
-			: 0;
-		const auto s = (pix.width() > pix.height())
-			? pix.height()
-			: pix.width();
-		p.drawPixmap(
-			0,
-			0,
-			st::settingsBackgroundThumb,
-			st::settingsBackgroundThumb,
-			pix,
-			sx,
-			sy,
-			s,
-			s);
+		if (const auto color = Window::Theme::Background()->color()) {
+			p.fillRect(
+				0,
+				0,
+				st::settingsBackgroundThumb,
+				st::settingsBackgroundThumb,
+				*color);
+		} else {
+			const auto &pix = Window::Theme::Background()->pixmap();
+			const auto sx = (pix.width() > pix.height())
+				? ((pix.width() - pix.height()) / 2)
+				: 0;
+			const auto sy = (pix.height() > pix.width())
+				? ((pix.height() - pix.width()) / 2)
+				: 0;
+			const auto s = (pix.width() > pix.height())
+				? pix.height()
+				: pix.width();
+			p.drawPixmap(
+				0,
+				0,
+				st::settingsBackgroundThumb,
+				st::settingsBackgroundThumb,
+				pix,
+				sx,
+				sy,
+				s,
+				s);
+		}
 	}
 	Images::prepareRound(back, ImageRoundRadius::Small);
 	_background = App::pixmapFromImageInPlace(std::move(back));
diff --git a/Telegram/SourceFiles/storage/cache/storage_cache_cleaner.cpp b/Telegram/SourceFiles/storage/cache/storage_cache_cleaner.cpp
index 664ca5257..7e6a18d0d 100644
--- a/Telegram/SourceFiles/storage/cache/storage_cache_cleaner.cpp
+++ b/Telegram/SourceFiles/storage/cache/storage_cache_cleaner.cpp
@@ -74,7 +74,7 @@ void CleanerObject::scheduleNext() {
 		return;
 	}
 	_weak.with([](CleanerObject &that) {
-		if (that._guard.alive()) {
+		if (that._guard) {
 			that.cleanNext();
 		}
 	});
diff --git a/Telegram/SourceFiles/storage/cache/storage_cache_compactor.cpp b/Telegram/SourceFiles/storage/cache/storage_cache_compactor.cpp
index d439d9203..10f49fbeb 100644
--- a/Telegram/SourceFiles/storage/cache/storage_cache_compactor.cpp
+++ b/Telegram/SourceFiles/storage/cache/storage_cache_compactor.cpp
@@ -175,7 +175,7 @@ void CompactorObject::fail() {
 void CompactorObject::done(int64 till) {
 	const auto path = compactPath();
 	_database.with([=, good = std::move(_guard)](DatabaseObject &database) {
-		if (good.alive()) {
+		if (good) {
 			database.compactorDone(path, till);
 		}
 	});
diff --git a/Telegram/SourceFiles/storage/file_download.cpp b/Telegram/SourceFiles/storage/file_download.cpp
index 22682519b..20f8dece3 100644
--- a/Telegram/SourceFiles/storage/file_download.cpp
+++ b/Telegram/SourceFiles/storage/file_download.cpp
@@ -247,7 +247,7 @@ void FileLoader::localLoaded(
 		const StorageImageSaved &result,
 		const QByteArray &imageFormat,
 		const QImage &imageData) {
-	_localLoading.kill();
+	_localLoading = nullptr;
 	if (result.data.isEmpty()) {
 		_localStatus = LocalStatus::NotFound;
 		start(true);
@@ -383,7 +383,7 @@ void FileLoader::loadLocal(const Storage::Cache::Key &key) {
 			format = std::move(format),
 			guard = std::move(guard)
 		]() mutable {
-			if (!guard.alive()) {
+			if (!guard) {
 				return;
 			}
 			localLoaded(
@@ -433,7 +433,7 @@ bool FileLoader::tryLoadLocal() {
 		return false;
 	} else if (_localStatus != LocalStatus::NotTried) {
 		return _finished;
-	} else if (_localLoading.alive()) {
+	} else if (_localLoading) {
 		_localStatus = LocalStatus::Loading;
 		return true;
 	}
diff --git a/Telegram/SourceFiles/storage/localstorage.cpp b/Telegram/SourceFiles/storage/localstorage.cpp
index d67022981..ce404b169 100644
--- a/Telegram/SourceFiles/storage/localstorage.cpp
+++ b/Telegram/SourceFiles/storage/localstorage.cpp
@@ -4061,7 +4061,7 @@ bool readBackground() {
 #ifndef OS_MAC_OLD
 	reader.setAutoTransform(true);
 #endif // OS_MAC_OLD
-	if (reader.read(&image)) {
+	if (reader.read(&image) || Window::Theme::GetWallPaperColor(slug)) {
 		_backgroundCanWrite = false;
 		Window::Theme::Background()->setImage({
 			id,
diff --git a/Telegram/SourceFiles/storage/storage_databases.cpp b/Telegram/SourceFiles/storage/storage_databases.cpp
index 2d5353fdc..580ed0c1b 100644
--- a/Telegram/SourceFiles/storage/storage_databases.cpp
+++ b/Telegram/SourceFiles/storage/storage_databases.cpp
@@ -72,7 +72,7 @@ DatabasePointer Databases::get(
 	if (const auto i = _map.find(path); i != end(_map)) {
 		auto &kept = i->second;
 		Assert(kept.destroying.alive());
-		kept.destroying.kill();
+		kept.destroying = nullptr;
 		kept.database->reconfigure(settings);
 		return DatabasePointer(this, kept.database);
 	}
@@ -93,7 +93,7 @@ void Databases::destroy(Cache::Database *database) {
 			database->close();
 			database->waitForCleaner([=, guard = std::move(second)]() mutable {
 				crl::on_main([=, guard = std::move(guard)]{
-					if (!guard.alive()) {
+					if (!guard) {
 						return;
 					}
 					_map.erase(path);
diff --git a/Telegram/SourceFiles/support/support_autocomplete.cpp b/Telegram/SourceFiles/support/support_autocomplete.cpp
index 7b5d2e591..d53f02856 100644
--- a/Telegram/SourceFiles/support/support_autocomplete.cpp
+++ b/Telegram/SourceFiles/support/support_autocomplete.cpp
@@ -278,7 +278,7 @@ AdminLog::OwnedItem GenerateCommentItem(
 		replyTo,
 		viaBotId,
 		unixtime(),
-		Auth().userId(),
+		history->session().userId(),
 		QString(),
 		TextWithEntities{ TextUtilities::Clean(data.comment) });
 	return AdminLog::OwnedItem(delegate, item);
@@ -296,7 +296,7 @@ AdminLog::OwnedItem GenerateContactItem(
 	const auto message = MTP_message(
 		MTP_flags(flags),
 		MTP_int(id),
-		MTP_int(Auth().userId()),
+		MTP_int(history->session().userId()),
 		peerToMTP(history->peer->id),
 		MTPMessageFwdHeader(),
 		MTP_int(viaBotId),
diff --git a/Telegram/SourceFiles/support/support_templates.cpp b/Telegram/SourceFiles/support/support_templates.cpp
index 643e3b83b..bc52d949d 100644
--- a/Telegram/SourceFiles/support/support_templates.cpp
+++ b/Telegram/SourceFiles/support/support_templates.cpp
@@ -476,7 +476,7 @@ void Templates::reload() {
 void Templates::load() {
 	if (_reloadAfterRead) {
 		return;
-	} else if (_reading.alive() || _updates) {
+	} else if (_reading || _updates) {
 		_reloadAfterRead = true;
 		return;
 	}
@@ -491,7 +491,7 @@ void Templates::load() {
 			result = std::move(result),
 			guard = std::move(guard)
 		]() mutable {
-			if (!guard.alive()) {
+			if (!guard) {
 				return;
 			}
 			setData(std::move(result.result));
diff --git a/Telegram/SourceFiles/ui/emoji_config.cpp b/Telegram/SourceFiles/ui/emoji_config.cpp
index 6a1d5024e..079ed986a 100644
--- a/Telegram/SourceFiles/ui/emoji_config.cpp
+++ b/Telegram/SourceFiles/ui/emoji_config.cpp
@@ -927,7 +927,7 @@ void Instance::checkUniversalImages() {
 
 	if (_id != Universal->id()) {
 		_id = Universal->id();
-		_generating.kill();
+		_generating = nullptr;
 		_sprites.clear();
 	}
 	if (!Universal->ensureLoaded() && Universal->id() != 0) {
@@ -952,7 +952,7 @@ void Instance::generateCache() {
 			image = universal->generate(size, index),
 			guard = std::move(guard)
 		]() mutable {
-			if (!guard.alive() || universal != Universal) {
+			if (!guard || universal != Universal) {
 				return;
 			}
 			pushSprite(std::move(image));
diff --git a/Telegram/SourceFiles/ui/image/image.cpp b/Telegram/SourceFiles/ui/image/image.cpp
index ba3eb7d6d..d633c62ff 100644
--- a/Telegram/SourceFiles/ui/image/image.cpp
+++ b/Telegram/SourceFiles/ui/image/image.cpp
@@ -750,6 +750,11 @@ QPixmap Image::pixBlurredColoredNoCache(
 	return App::pixmapFromImageInPlace(prepareColored(add, img));
 }
 
+QImage Image::original() const {
+	checkSource();
+	return _data;
+}
+
 void Image::automaticLoad(Data::FileOrigin origin, const HistoryItem *item) {
 	if (!loaded()) {
 		_source->automaticLoad(origin, item);
diff --git a/Telegram/SourceFiles/ui/image/image.h b/Telegram/SourceFiles/ui/image/image.h
index e954f175f..6f0ba3eac 100644
--- a/Telegram/SourceFiles/ui/image/image.h
+++ b/Telegram/SourceFiles/ui/image/image.h
@@ -102,6 +102,8 @@ public:
 
 	static ImagePtr Blank();
 
+	QImage original() const;
+
 	const QPixmap &pix(
 		Data::FileOrigin origin,
 		int32 w = 0,
diff --git a/Telegram/SourceFiles/window/notifications_manager_default.cpp b/Telegram/SourceFiles/window/notifications_manager_default.cpp
index b4294cfd6..1912f3a9c 100644
--- a/Telegram/SourceFiles/window/notifications_manager_default.cpp
+++ b/Telegram/SourceFiles/window/notifications_manager_default.cpp
@@ -411,7 +411,7 @@ void Widget::hideSlow() {
 		auto [left, right] = base::make_binary_guard();
 		_hidingDelayed = std::move(left);
 		App::CallDelayed(st::notifySlowHide, this, [=, guard = std::move(right)] {
-			if (guard.alive() && _hiding) {
+			if (guard && _hiding) {
 				hideFast();
 			}
 		});
diff --git a/Telegram/SourceFiles/window/section_widget.cpp b/Telegram/SourceFiles/window/section_widget.cpp
index 3cfb1b16d..24890b12f 100644
--- a/Telegram/SourceFiles/window/section_widget.cpp
+++ b/Telegram/SourceFiles/window/section_widget.cpp
@@ -78,6 +78,10 @@ void SectionWidget::PaintBackground(QWidget *widget, QPaintEvent *event) {
 
 	auto clip = event->rect();
 	auto fill = QRect(0, 0, widget->width(), App::main()->height());
+	if (const auto color = Window::Theme::Background()->color()) {
+		p.fillRect(fill, *color);
+		return;
+	}
 	auto fromy = App::main()->backgroundFromY();
 	auto x = 0, y = 0;
 	auto cached = App::main()->cachedBackground(fill, x, y);
diff --git a/Telegram/SourceFiles/window/themes/window_theme.cpp b/Telegram/SourceFiles/window/themes/window_theme.cpp
index aec218e3d..941c0e3db 100644
--- a/Telegram/SourceFiles/window/themes/window_theme.cpp
+++ b/Telegram/SourceFiles/window/themes/window_theme.cpp
@@ -24,7 +24,6 @@ constexpr auto kThemeFileSizeLimit = 5 * 1024 * 1024;
 constexpr auto kThemeBackgroundSizeLimit = 4 * 1024 * 1024;
 constexpr auto kBackgroundSizeLimit = 25 * 1024 * 1024;
 constexpr auto kThemeSchemeSizeLimit = 1024 * 1024;
-constexpr auto kMinimumTiledSize = 512;
 constexpr auto kNightThemeFile = str_const(":/gui/night.tdesktop-theme");
 
 struct Applying {
@@ -327,8 +326,9 @@ bool loadTheme(const QByteArray &content, Cached &cache, Instance *out = nullptr
 }
 
 QImage prepareBackgroundImage(QImage &&image) {
-	if (image.format() != QImage::Format_ARGB32 && image.format() != QImage::Format_ARGB32_Premultiplied && image.format() != QImage::Format_RGB32) {
-		image = std::move(image).convertToFormat(QImage::Format_RGB32);
+	if (image.format() != QImage::Format_ARGB32_Premultiplied) {
+		image = std::move(image).convertToFormat(
+			QImage::Format_ARGB32_Premultiplied);
 	}
 	image.setDevicePixelRatio(cRetinaFactor());
 	return std::move(image);
@@ -391,9 +391,9 @@ void ChatBackground::setImage(
 		&& !nightMode()
 		&& _themeAbsolutePath.isEmpty();
 	if (paper.id == kThemeBackground && _themeImage.isNull()) {
-		_paper = { kDefaultBackground };
+		setPaper({ kDefaultBackground });
 	} else {
-		_paper = paper;
+		setPaper(paper);
 		if (needResetAdjustable) {
 			// If we had a default color theme with non-default background,
 			// and we switch to default background we must somehow switch from
@@ -410,18 +410,21 @@ void ChatBackground::setImage(
 		|| id() == details::kTestingEditorBackground) {
 		if (id() == details::kTestingDefaultBackground || image.isNull()) {
 			image.load(qsl(":/gui/art/bg.jpg"));
-			_paper = { details::kTestingDefaultBackground };
+			setPaper({ details::kTestingDefaultBackground });
 		}
-		setPreparedImage(std::move(image));
+		setPreparedImage(prepareBackgroundImage(std::move(image)));
 	} else {
 		if (id() == kInitialBackground) {
 			image.load(qsl(":/gui/art/bg_initial.jpg"));
 			const auto scale = cScale() * cIntRetinaFactor();
 			if (scale != 100) {
-				image = image.scaledToWidth(ConvertScale(image.width(), scale), Qt::SmoothTransformation);
+				image = image.scaledToWidth(
+					ConvertScale(image.width(), scale),
+					Qt::SmoothTransformation);
 			}
-		} else if (id() == kDefaultBackground || image.isNull()) {
-			_paper = { kDefaultBackground };
+		} else if (id() == kDefaultBackground
+			|| (!color() && image.isNull())) {
+			setPaper({ kDefaultBackground });
 			image.load(qsl(":/gui/art/bg.jpg"));
 		}
 		Local::writeBackground(
@@ -429,9 +432,16 @@ void ChatBackground::setImage(
 			((id() == kDefaultBackground || id() == kInitialBackground)
 				? QImage()
 				: image));
-		setPreparedImage(prepareBackgroundImage(std::move(image)));
+		if (const auto fill = color()) {
+			if (adjustPaletteRequired()) {
+				adjustPaletteUsingColor(*fill);
+			}
+		} else {
+			setPreparedImage(prepareBackgroundImage(std::move(image)));
+		}
 	}
-	Assert(!_pixmap.isNull() && !_pixmapForTiled.isNull());
+	Assert((!_pixmap.isNull() && !_pixmapForTiled.isNull()) || color());
+
 	notify(BackgroundUpdate(BackgroundUpdate::Type::New, tile()));
 	if (needResetAdjustable) {
 		notify(BackgroundUpdate(BackgroundUpdate::Type::TestingTheme, tile()), true);
@@ -440,33 +450,11 @@ void ChatBackground::setImage(
 }
 
 void ChatBackground::setPreparedImage(QImage &&image) {
-	image = std::move(image).convertToFormat(QImage::Format_ARGB32_Premultiplied);
+	Expects(image.format() == QImage::Format_ARGB32_Premultiplied);
+
 	image.setDevicePixelRatio(cRetinaFactor());
 
-	const auto adjustColors = [&] {
-		const auto usingThemeBackground = [&] {
-			return (id() == kThemeBackground)
-				|| (id() == details::kTestingThemeBackground);
-		};
-		const auto usingDefaultBackground = [&] {
-			return (id() == kDefaultBackground)
-				|| (id() == details::kTestingDefaultBackground);
-		};
-		const auto testingPalette = [&] {
-			const auto path = AreTestingTheme()
-				? GlobalApplying.pathAbsolute
-				: _themeAbsolutePath;
-			return IsPaletteTestingPath(path);
-		};
-
-		if (testingPalette()) {
-			return false;
-		} else if (isNonDefaultThemeOrBackground() || nightMode()) {
-			return !usingThemeBackground();
-		}
-		return !usingDefaultBackground();
-	}();
-	if (adjustColors) {
+	if (adjustPaletteRequired()) {
 		adjustPaletteUsingBackground(image);
 	}
 
@@ -500,6 +488,35 @@ void ChatBackground::setPreparedImage(QImage &&image) {
 	}
 }
 
+void ChatBackground::setPaper(const Data::WallPaper &paper) {
+	_paper = paper;
+	_paperColor = GetWallPaperColor(_paper.slug);
+}
+
+bool ChatBackground::adjustPaletteRequired() {
+	const auto usingThemeBackground = [&] {
+		return (id() == kThemeBackground)
+			|| (id() == details::kTestingThemeBackground);
+	};
+	const auto usingDefaultBackground = [&] {
+		return (id() == kDefaultBackground)
+			|| (id() == details::kTestingDefaultBackground);
+	};
+	const auto testingPalette = [&] {
+		const auto path = AreTestingTheme()
+			? GlobalApplying.pathAbsolute
+			: _themeAbsolutePath;
+		return IsPaletteTestingPath(path);
+	};
+
+	if (testingPalette()) {
+		return false;
+	} else if (isNonDefaultThemeOrBackground() || nightMode()) {
+		return !usingThemeBackground();
+	}
+	return !usingDefaultBackground();
+}
+
 void ChatBackground::adjustPaletteUsingBackground(const QImage &img) {
 	Assert(img.format() == QImage::Format_ARGB32_Premultiplied);
 
@@ -522,9 +539,13 @@ void ChatBackground::adjustPaletteUsingBackground(const QImage &img) {
 		}
 	}
 
-	auto bgColor = QColor(components[0], components[1], components[2]);
-	auto hue = bgColor.hslHueF();
-	auto saturation = bgColor.hslSaturationF();
+	adjustPaletteUsingColor(
+		QColor(components[0], components[1], components[2]));
+}
+
+void ChatBackground::adjustPaletteUsingColor(QColor color) {
+	auto hue = color.hslHueF();
+	auto saturation = color.hslSaturationF();
 	for (const auto &color : _adjustableColors) {
 		adjustColor(color.item, hue, saturation);
 	}
@@ -534,6 +555,18 @@ WallPaperId ChatBackground::id() const {
 	return _paper.id;
 }
 
+QImage ChatBackground::createCurrentImage() const {
+	if (const auto fill = color()) {
+		auto result = QImage(
+			kMinimumTiledSize,
+			kMinimumTiledSize,
+			QImage::Format_ARGB32_Premultiplied);
+		result.fill(*fill);
+		return result;
+	}
+	return pixmap().toImage();
+}
+
 bool ChatBackground::tile() const {
 	return nightMode() ? _tileNightValue : _tileDayValue;
 }
@@ -683,21 +716,21 @@ void ChatBackground::setTestingDefaultTheme() {
 void ChatBackground::keepApplied(const QString &path, bool write) {
 	setThemeAbsolutePath(path);
 	if (id() == details::kTestingEditorBackground) {
-		_paper = { kCustomBackground };
+		setPaper({ kCustomBackground });
 		_themeImage = QImage();
 		_themeTile = false;
 		if (write) {
 			writeNewBackgroundSettings();
 		}
 	} else if (id() == details::kTestingThemeBackground) {
-		_paper = { kThemeBackground };
-		_themeImage = _pixmap.toImage();
+		setPaper({ kThemeBackground });
+		_themeImage = prepareBackgroundImage(_pixmap.toImage());
 		_themeTile = tile();
 		if (write) {
 			writeNewBackgroundSettings();
 		}
 	} else if (id() == details::kTestingDefaultBackground) {
-		_paper = { kDefaultBackground };
+		setPaper({ kDefaultBackground });
 		_themeImage = QImage();
 		_themeTile = false;
 		if (write) {
@@ -980,6 +1013,35 @@ bool IsPaletteTestingPath(const QString &path) {
 	return false;
 }
 
+std::optional<QColor> GetWallPaperColor(const QString &slug) {
+	if (slug.size() != 6) {
+		return {};
+	} else if (ranges::find_if(slug, [](QChar ch) {
+		return (ch < 'a' || ch > 'f')
+			&& (ch < 'A' || ch > 'F')
+			&& (ch < '0' || ch > '9');
+	}) != slug.end()) {
+		return {};
+	}
+	const auto component = [](const QString &text, int index) {
+		const auto decimal = [](QChar hex) {
+			const auto code = hex.unicode();
+			return (code >= '0' && code <= '9')
+				? int(code - '0')
+				: (code >= 'a' && code <= 'f')
+				? int(code - 'a' + 0x0a)
+				: int(code - 'A' + 0x0a);
+		};
+		index *= 2;
+		return decimal(text[index]) * 0x10 + decimal(text[index + 1]);
+	};
+	return QColor(
+		component(slug, 0),
+		component(slug, 1),
+		component(slug, 2),
+		255);
+}
+
 void ComputeBackgroundRects(QRect wholeFill, QSize imageSize, QRect &to, QRect &from) {
 	if (uint64(imageSize.width()) * wholeFill.height() > uint64(imageSize.height()) * wholeFill.width()) {
 		float64 pxsize = wholeFill.height() / float64(imageSize.height());
diff --git a/Telegram/SourceFiles/window/themes/window_theme.h b/Telegram/SourceFiles/window/themes/window_theme.h
index d07b9c1cd..b4589bbc0 100644
--- a/Telegram/SourceFiles/window/themes/window_theme.h
+++ b/Telegram/SourceFiles/window/themes/window_theme.h
@@ -41,6 +41,8 @@ constexpr auto kCustomBackground = details::FromLegacyBackgroundId(-1);
 constexpr auto kInitialBackground = details::FromLegacyBackgroundId(0);
 constexpr auto kDefaultBackground = details::FromLegacyBackgroundId(105);
 
+constexpr auto kMinimumTiledSize = 512;
+
 struct Cached {
 	QByteArray colors;
 	QByteArray background;
@@ -78,16 +80,18 @@ void ApplyDefaultWithPath(const QString &themePath);
 bool ApplyEditedPalette(const QString &path, const QByteArray &content);
 void KeepApplied();
 QString NightThemePath();
-bool IsNightMode();
+[[nodiscard]] bool IsNightMode();
 void SetNightModeValue(bool nightMode);
 void ToggleNightMode();
 void ToggleNightMode(const QString &themePath);
-bool IsNonDefaultBackground();
+[[nodiscard]] bool IsNonDefaultBackground();
 void Revert();
 
 bool LoadFromFile(const QString &file, Instance *out, QByteArray *outContent);
 bool IsPaletteTestingPath(const QString &path);
 
+[[nodiscard]] std::optional<QColor> GetWallPaperColor(const QString &slug);
+
 struct BackgroundUpdate {
 	enum class Type {
 		New,
@@ -121,7 +125,7 @@ public:
 	void setTileDayValue(bool tile);
 	void setTileNightValue(bool tile);
 	void setThemeAbsolutePath(const QString &path);
-	QString themeAbsolutePath() const;
+	[[nodiscard]] QString themeAbsolutePath() const;
 	void reset();
 
 	void setTestingTheme(Instance &&theme);
@@ -129,16 +133,20 @@ public:
 	void setTestingDefaultTheme();
 	void revert();
 
-	WallPaperId id() const;
-	const QPixmap &pixmap() const {
+	[[nodiscard]] WallPaperId id() const;
+	[[nodiscard]] const QPixmap &pixmap() const {
 		return _pixmap;
 	}
-	const QPixmap &pixmapForTiled() const {
+	[[nodiscard]] const QPixmap &pixmapForTiled() const {
 		return _pixmapForTiled;
 	}
-	bool tile() const;
-	bool tileDay() const;
-	bool tileNight() const;
+	[[nodiscard]] std::optional<QColor> color() const {
+		return _paperColor;
+	}
+	[[nodiscard]] QImage createCurrentImage() const;
+	[[nodiscard]] bool tile() const;
+	[[nodiscard]] bool tileDay() const;
+	[[nodiscard]] bool tileNight() const;
 
 private:
 	struct AdjustableColor {
@@ -152,16 +160,19 @@ private:
 	void saveForRevert();
 	void setPreparedImage(QImage &&image);
 	void writeNewBackgroundSettings();
+	void setPaper(const Data::WallPaper &paper);
 
+	[[nodiscard]] bool adjustPaletteRequired();
 	void adjustPaletteUsingBackground(const QImage &img);
+	void adjustPaletteUsingColor(QColor color);
 	void restoreAdjustableColors();
 
 	void setNightModeValue(bool nightMode);
-	bool nightMode() const;
+	[[nodiscard]] bool nightMode() const;
 	void toggleNightMode(std::optional<QString> themePath);
 	void keepApplied(const QString &path, bool write);
-	bool isNonDefaultThemeOrBackground();
-	bool isNonDefaultBackground();
+	[[nodiscard]] bool isNonDefaultThemeOrBackground();
+	[[nodiscard]] bool isNonDefaultBackground();
 
 	friend bool IsNightMode();
 	friend void SetNightModeValue(bool nightMode);
@@ -171,6 +182,7 @@ private:
 	friend bool IsNonDefaultBackground();
 
 	Data::WallPaper _paper = { details::kUninitializedBackground };
+	std::optional<QColor> _paperColor;
 	QPixmap _pixmap;
 	QPixmap _pixmapForTiled;
 	bool _nightMode = false;
diff --git a/Telegram/SourceFiles/window/themes/window_theme_editor.cpp b/Telegram/SourceFiles/window/themes/window_theme_editor.cpp
index cfdfcc76b..68da92db6 100644
--- a/Telegram/SourceFiles/window/themes/window_theme_editor.cpp
+++ b/Telegram/SourceFiles/window/themes/window_theme_editor.cpp
@@ -319,8 +319,8 @@ void Editor::Inner::prepare() {
 }
 
 Fn<void()> Editor::Inner::exportCallback() {
-	return App::LambdaDelayed(st::defaultRippleAnimation.hideDuration, this, [this] {
-		auto background = Background()->pixmap().toImage();
+	return App::LambdaDelayed(st::defaultRippleAnimation.hideDuration, this, [=] {
+		auto background = Background()->createCurrentImage();
 		auto backgroundContent = QByteArray();
 		auto tiled = Background()->tile();
 		{