Generate good thumbnail for animated stickers.

Telegram/SourceFiles/data/data_document.cpp

@@ -636,7 +636,10 @@ Image *DocumentData::goodThumbnail() const {
 }
 
 void DocumentData::validateGoodThumbnail() {
-	if (!isVideoFile() && !isAnimation() && !isWallPaper()) {
+	if (!isVideoFile()
+		&& !isAnimation()
+		&& !isWallPaper()
+		&& (!sticker() || !sticker()->animated)) {
 		_goodThumbnail = nullptr;
 	} else if (!_goodThumbnail && hasRemoteLocation()) {
 		_goodThumbnail = std::make_unique<Image>(
@@ -665,7 +668,10 @@ void DocumentData::setGoodThumbnailOnUpload(
 	}
 	_goodThumbnail = std::make_unique<Image>(
 		std::make_unique<Images::LocalFileSource>(
-			QString(), std::move(bytes), "JPG", std::move(image)));
+			QString(),
+			std::move(bytes),
+			sticker() ? "WEBP" : "JPG",
+			std::move(image)));
 }
 
 auto DocumentData::bigFileBaseCacheKey() const

Telegram/SourceFiles/data/data_document_good_thumbnail.cpp

@@ -11,6 +11,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_document.h"
 #include "data/data_file_origin.h"
 #include "media/clip/media_clip_reader.h"
+#include "lottie/lottie_animation.h"
 #include "auth_session.h"
 
 namespace Data {
@@ -19,12 +20,20 @@ namespace {
 constexpr auto kGoodThumbQuality = 87;
 constexpr auto kWallPaperSize = 960;
 
+enum class FileType {
+	Video,
+	AnimatedSticker,
+	WallPaper,
+};
+
 QImage Prepare(
 		const QString &path,
 		QByteArray data,
-		bool isWallPaper) {
+		FileType type) {
-	if (!isWallPaper) {
+	if (type == FileType::Video) {
 		return Media::Clip::PrepareForSending(path, data).thumbnail;
+	} else if (type == FileType::AnimatedSticker) {
+		return Lottie::ReadThumbnail(Lottie::ReadContent(data, path));
 	}
 	const auto validateSize = [](QSize size) {
 		return (size.width() + size.height()) < 10'000;
@@ -64,7 +73,11 @@ void GoodThumbSource::generate(base::binary_guard &&guard) {
 		return;
 	}
 	const auto data = _document->data();
-	const auto isWallPaper = _document->isWallPaper();
+	const auto type = _document->isWallPaper()
+		? FileType::WallPaper
+		: _document->sticker()
+		? FileType::AnimatedSticker
+		: FileType::Video;
 	auto location = _document->location().isEmpty()
 		? nullptr
 		: std::make_unique<FileLocation>(_document->location());
@@ -80,11 +93,13 @@ void GoodThumbSource::generate(base::binary_guard &&guard) {
 		const auto filepath = (location && location->accessEnable())
 			? location->name()
 			: QString();
-		auto result = Prepare(filepath, data, isWallPaper);
+		auto result = Prepare(filepath, data, type);
 		auto bytes = QByteArray();
 		if (!result.isNull()) {
 			auto buffer = QBuffer(&bytes);
-			const auto format = (isWallPaper && result.hasAlphaChannel())
+			const auto format = (type == FileType::AnimatedSticker)
+				? "WEBP"
+				: (type == FileType::WallPaper && result.hasAlphaChannel())
 				? "PNG"
 				: "JPG";
 			result.save(&buffer, format, kGoodThumbQuality);

Telegram/SourceFiles/history/media/history_media_sticker.cpp

@@ -156,6 +156,10 @@ void HistorySticker::draw(Painter &p, const QRect &r, TextSelection selection, c
 		const auto w = _pixw;
 		const auto h = _pixh;
 		const auto &c = st::msgStickerOverlay;
+		const auto good = _data->goodThumbnail();
+		if (!lottieReady && good && !good->loaded()) {
+			good->load({});
+		}
 		static QPixmap empty;
 		if (lottieReady) {
 			return empty;
@@ -170,6 +174,10 @@ void HistorySticker::draw(Painter &p, const QRect &r, TextSelection selection, c
 		//	return selected
 		//		? blurred->pixBlurredColored(o, c, w, h)
 		//		: blurred->pixBlurred(o, w, h);
+		} else if (good && good->loaded()) {
+			return selected
+				? good->pixColored(o, c, w, h)
+				: good->pix(o, w, h);
 		} else if (const auto thumbnail = _data->thumbnail()) {
 			return selected
 				? thumbnail->pixBlurredColored(o, c, w, h)

Telegram/SourceFiles/storage/localimageloader.cpp

@@ -894,6 +894,13 @@ void FileLoadTask::process() {
 					MTP_string(QString()),
 					MTP_inputStickerSetEmpty(),
 					MTPMaskCoords()));
+				if (isAnimation) {
+					goodThumbnail = fullimage;
+					{
+						QBuffer buffer(&goodThumbnailBytes);
+						goodThumbnail.save(&buffer, "WEBP", kThumbnailQuality);
+					}
+				}
 			} else if (isAnimation) {
 				attributes.push_back(MTP_documentAttributeAnimated());
 			} else if (_type != SendMediaType::File) {