Preview lottie animations in media viewer.

Telegram/SourceFiles/data/data_document.cpp

@@ -28,6 +28,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/image/image_source.h"
 #include "mainwindow.h"
 #include "core/application.h"
+#include "lottie/lottie_animation.h"
 #include "media/streaming/media_streaming_loader_mtproto.h"
 #include "media/streaming/media_streaming_loader_local.h"
 
@@ -302,7 +303,11 @@ void DocumentOpenClickHandler::Open(
 			const auto guard = gsl::finally([&] {
 				location.accessDisable();
 			});
-			if (QImageReader(location.name()).canRead()) {
+			const auto path = location.name();
+			if (QImageReader(path).canRead()) {
+				Core::App().showDocument(data, context);
+				return;
+			} else if (Lottie::ValidateFile(path)) {
 				Core::App().showDocument(data, context);
 				return;
 			}

Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp

@@ -25,6 +25,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "media/streaming/media_streaming_player.h"
 #include "media/streaming/media_streaming_loader.h"
 #include "media/player/media_player_instance.h"
+#include "lottie/lottie_animation.h"
 #include "history/history.h"
 #include "history/history_message.h"
 #include "data/data_media_types.h"
@@ -126,6 +127,21 @@ void PaintImageProfile(QPainter &p, const QImage &image, QRect rect, QRect fill)
 	});
 }
 
+QPixmap PrepareStaticImage(const QString &path) {
+	auto image = App::readImage(path, nullptr, false);
+#if defined Q_OS_MAC && !defined OS_MAC_OLD
+	if (image.width() > kMaxDisplayImageSize
+		|| image.height() > kMaxDisplayImageSize) {
+		image = image.scaled(
+			kMaxDisplayImageSize,
+			kMaxDisplayImageSize,
+			Qt::KeepAspectRatio,
+			Qt::SmoothTransformation);
+	}
+#endif // Q_OS_MAC && !OS_MAC_OLD
+	return App::pixmapFromImageInPlace(std::move(image));
+}
+
 } // namespace
 
 struct OverlayWidget::SharedMedia {
@@ -175,6 +191,16 @@ struct OverlayWidget::Streamed {
 	bool resumeOnCallEnd = false;
 };
 
+struct OverlayWidget::LottieFile {
+	template <typename Callback>
+	LottieFile(
+		std::unique_ptr<Lottie::Animation> data,
+		Callback &&animationCallback);
+
+	std::unique_ptr<Lottie::Animation> data;
+	Ui::Animations::Basic animation;
+};
+
 template <typename Callback>
 OverlayWidget::Streamed::Streamed(
 	not_null<Data::Session*> owner,
@@ -189,6 +215,14 @@ OverlayWidget::Streamed::Streamed(
 	st::mediaviewStreamingRadial) {
 }
 
+template <typename Callback>
+OverlayWidget::LottieFile::LottieFile(
+	std::unique_ptr<Lottie::Animation> data,
+	Callback &&animationCallback)
+: data(std::move(data))
+, animation(std::forward<Callback>(animationCallback)) {
+}
+
 OverlayWidget::OverlayWidget()
 : OverlayParent(nullptr)
 , _transparentBrush(style::transparentPlaceholderBrush())
@@ -401,7 +435,11 @@ bool OverlayWidget::documentContentShown() const {
 
 bool OverlayWidget::documentBubbleShown() const {
 	return (!_photo && !_doc)
-		|| (_doc && !_themePreviewShown && _current.isNull() && !_streamed);
+		|| (_doc
+			&& !_themePreviewShown
+			&& !_streamed
+			&& !_lottie
+			&& _current.isNull());
 }
 
 void OverlayWidget::clearStreaming() {
@@ -409,6 +447,10 @@ void OverlayWidget::clearStreaming() {
 	_streamed = nullptr;
 }
 
+void OverlayWidget::clearLottie() {
+	_lottie = nullptr;
+}
+
 void OverlayWidget::documentUpdated(DocumentData *doc) {
 	if (documentBubbleShown() && _doc && _doc == doc) {
 		if ((_doc->loading() && _docCancel->isHidden()) || (!_doc->loading() && !_docCancel->isHidden())) {
@@ -927,6 +969,7 @@ void OverlayWidget::clearData() {
 		_animationOpacities.clear();
 	}
 	clearStreaming();
+	clearLottie();
 	delete _menu;
 	_menu = nullptr;
 	setContext(std::nullopt);
@@ -1721,6 +1764,7 @@ void OverlayWidget::displayPhoto(not_null<PhotoData*> photo, HistoryItem *item)
 	}
 
 	clearStreaming();
+	clearLottie();
 	destroyThemePreview();
 	_doc = nullptr;
 	_fullScreenVideo = false;
@@ -1772,6 +1816,7 @@ void OverlayWidget::displayDocument(DocumentData *doc, HistoryItem *item) {
 	_fullScreenVideo = false;
 	_current = QPixmap();
 	clearStreaming();
+	clearLottie();
 	destroyThemePreview();
 	_doc = doc;
 	_photo = nullptr;
@@ -1801,19 +1846,14 @@ void OverlayWidget::displayDocument(DocumentData *doc, HistoryItem *item) {
 			} else {
 				auto &location = _doc->location(true);
 				if (location.accessEnable()) {
-					if (QImageReader(location.name()).canRead()) {
-						auto image = App::readImage(location.name(), nullptr, false);
-#if defined Q_OS_MAC && !defined OS_MAC_OLD
-						if (image.width() > kMaxDisplayImageSize
-							|| image.height() > kMaxDisplayImageSize) {
-							image = image.scaled(
-								kMaxDisplayImageSize,
-								kMaxDisplayImageSize,
-								Qt::KeepAspectRatio,
-								Qt::SmoothTransformation);
-						}
-#endif // Q_OS_MAC && !OS_MAC_OLD
-						_current = App::pixmapFromImageInPlace(std::move(image));
+					const auto &path = location.name();
+					if (QImageReader(path).canRead()) {
+						_current = PrepareStaticImage(path);
+					} else if (auto lottie = Lottie::FromFile(path)) {
+						_lottie = std::make_unique<LottieFile>(
+							std::move(lottie),
+							[=] { update(); });
+						_lottie->animation.start();
 					}
 				}
 				location.accessDisable();
@@ -2513,6 +2553,8 @@ void OverlayWidget::paintEvent(QPaintEvent *e) {
 		}
 	} else if (_themePreviewShown) {
 		paintThemePreview(p, r);
+	} else if (_lottie) {
+		paintLottieFrame(p, r);
 	} else if (documentBubbleShown()) {
 		if (_docRect.intersects(r)) {
 			p.fillRect(_docRect, st::mediaviewFileBg);
@@ -2879,6 +2921,19 @@ void OverlayWidget::paintThemePreview(Painter &p, QRect clip) {
 	}
 }
 
+void OverlayWidget::paintLottieFrame(Painter &p, QRect clip) {
+	Expects(_lottie != nullptr);
+
+	const auto frame = _lottie->data->frame(crl::now());
+	if (!frame.isNull()) {
+		const auto x = (width() - frame.width()) / 2;
+		const auto y = (height() - frame.height()) / 2;
+		const auto background = _lottieDark ? Qt::black : Qt::white;
+		p.fillRect(x, y, frame.width(), frame.height(), background);
+		p.drawImage(x, y, frame);
+	}
+}
+
 void OverlayWidget::keyPressEvent(QKeyEvent *e) {
 	const auto ctrl = e->modifiers().testFlag(Qt::ControlModifier);
 	if (_streamed) {
@@ -2931,6 +2986,9 @@ void OverlayWidget::keyPressEvent(QKeyEvent *e) {
 			zoomOut();
 		} else if (e->key() == Qt::Key_0) {
 			zoomReset();
+		} else if (e->key() == Qt::Key_I) {
+			_lottieDark = !_lottieDark;
+			update();
 		}
 	}
 }
@@ -3124,6 +3182,7 @@ bool OverlayWidget::moveToEntity(const Entity &entity, int preloadDelta) {
 		setContext(std::nullopt);
 	}
 	clearStreaming();
+	clearLottie();
 	_streamingStartPaused = false;
 	if (auto photo = base::get_if<not_null<PhotoData*>>(&entity.data)) {
 		displayPhoto(*photo, entity.item);
@@ -3614,6 +3673,7 @@ void OverlayWidget::setVisibleHook(bool visible) {
 		QCoreApplication::instance()->removeEventFilter(this);
 
 		clearStreaming();
+		clearLottie();
 		destroyThemePreview();
 		_radial.stop();
 		_current = QPixmap();

Telegram/SourceFiles/media/view/media_view_overlay_widget.h

@@ -32,7 +32,6 @@ namespace Notify {
 struct PeerUpdate;
 } // namespace Notify
 
-
 namespace Media {
 namespace Player {
 struct TrackState;
@@ -121,6 +120,7 @@ private slots:
 
 private:
 	struct Streamed;
+	struct LottieFile;
 
 	enum OverState {
 		OverNone,
@@ -314,6 +314,9 @@ private:
 	void paintTransformedVideoFrame(Painter &p);
 	void clearStreaming();
 
+	void paintLottieFrame(Painter &p, QRect clip);
+	void clearLottie();
+
 	QBrush _transparentBrush;
 
 	PhotoData *_photo = nullptr;
@@ -362,6 +365,8 @@ private:
 	bool _blurred = true;
 
 	std::unique_ptr<Streamed> _streamed;
+	std::unique_ptr<LottieFile> _lottie;
+	bool _lottieDark = false;
 
 	const style::icon *_docIcon = nullptr;
 	style::color _docIconColor;