Added adapting existing sticker into custom emoji.

Telegram/Resources/langs/lang.strings

@@ -4603,6 +4603,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_stickers_add_existing" = "Add an Existing Sticker";
 "lng_emoji_create_new" = "Create a New Emoji";
 "lng_emoji_add_existing" = "Add an Existing Emoji";
+"lng_emoji_adapt_sticker" = "Adapt from a Sticker";
+"lng_emoji_adapt_no_video" = "Video stickers are not supported yet.";
 "lng_stickers_add_to_set" = "Add to Sticker Set";
 "lng_stickers_already_in_set" = "This Sticker is already in the Set.";
 "lng_stickers_set_is_full" = "This Sticker Set is full.";

Telegram/SourceFiles/boxes/sticker_creator_box.cpp

@@ -11,6 +11,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "chat_helpers/compose/compose_show.h"
 #include "chat_helpers/emoji_picker_overlay.h"
 #include "core/file_utilities.h"
+#include "data/data_document.h"
+#include "data/data_document_media.h"
 #include "editor/editor_layer_widget.h"
 #include "editor/photo_editor.h"
 #include "editor/photo_editor_common.h"
@@ -242,6 +244,35 @@ void OpenPhotoEditorForImage(
 	return bytes;
 }
 
+void LoadStickerImage(
+		std::shared_ptr<ChatHelpers::Show> show,
+		not_null<DocumentData*> document,
+		Fn<void(QImage)> done) {
+	struct State {
+		std::shared_ptr<Data::DocumentMedia> media;
+		rpl::lifetime lifetime;
+	};
+	const auto state = std::make_shared<State>();
+	state->media = document->createMediaView();
+	state->media->checkStickerLarge();
+	const auto finish = [=] {
+		const auto large = state->media->getStickerLarge();
+		auto image = large ? large->original() : QImage();
+		state->lifetime.destroy();
+		done(std::move(image));
+	};
+	if (state->media->loaded()) {
+		finish();
+		return;
+	}
+	show->session().downloaderTaskFinished(
+	) | rpl::filter([=] {
+		return state->media->loaded();
+	}) | rpl::on_next([=] {
+		finish();
+	}, state->lifetime);
+}
+
 } // namespace
 
 namespace Api {
@@ -487,4 +518,54 @@ void OpenCreateEmojiFlow(
 		std::move(done));
 }
 
+bool AdaptStickerToEmoji(
+		std::shared_ptr<ChatHelpers::Show> show,
+		StickerSetIdentifier set,
+		not_null<DocumentData*> document,
+		Fn<void(MTPmessages_StickerSet)> done) {
+	const auto sticker = document->sticker();
+	if (!sticker || sticker->isWebm()) {
+		show->showToast(tr::lng_emoji_adapt_no_video(tr::now));
+		return false;
+	}
+	if (sticker->isLottie()) {
+		const auto emoji = StickerEmojiOrDefault(document);
+		AddExistingStickerToSet(
+			&show->session(),
+			set,
+			document,
+			emoji,
+			[=](MTPmessages_StickerSet result) {
+				show->showToast(tr::lng_emoji_added(tr::now));
+				if (done) {
+					done(result);
+				}
+			},
+			[=](QString err) {
+				show->showToast(err.isEmpty()
+					? tr::lng_attach_failed(tr::now)
+					: err);
+			});
+		return true;
+	}
+	LoadStickerImage(
+		show,
+		document,
+		[=, set = std::move(set), done = std::move(done)](
+				QImage image) mutable {
+			if (image.isNull()) {
+				show->showToast(
+					tr::lng_stickers_create_open_failed(tr::now));
+				return;
+			}
+			RunImageEditorAndCreate(
+				show,
+				std::move(set),
+				std::move(image),
+				Data::StickersType::Emoji,
+				std::move(done));
+		});
+	return true;
+}
+
 } // namespace Api

Telegram/SourceFiles/boxes/sticker_creator_box.h

@@ -9,6 +9,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "data/stickers/data_stickers.h"
 
+class DocumentData;
+
 namespace ChatHelpers {
 class Show;
 } // namespace ChatHelpers
@@ -29,4 +31,10 @@ void OpenCreateEmojiFlow(
 	StickerSetIdentifier set,
 	Fn<void(MTPmessages_StickerSet)> done = nullptr);
 
+[[nodiscard]] bool AdaptStickerToEmoji(
+	std::shared_ptr<ChatHelpers::Show> show,
+	StickerSetIdentifier set,
+	not_null<DocumentData*> document,
+	Fn<void(MTPmessages_StickerSet)> done = nullptr);
+
 } // namespace Api

Telegram/SourceFiles/boxes/sticker_set_box.cpp

@@ -404,6 +404,7 @@ private:
 	void startCreateNewStickerFlow();
 	void startAddExistingEmojiFlow();
 	void startCreateNewEmojiFlow();
+	void startAdaptStickerToEmojiFlow();
 	[[nodiscard]] ChatHelpers::TabbedPanel *createPickerPanel(
 		ChatHelpers::TabbedSelector::Mode mode,
 		uint64 excludeSetId);
@@ -2533,6 +2534,10 @@ void StickerSetBox::Inner::showAddMenu(QPoint globalPos) {
 			tr::lng_emoji_add_existing(tr::now),
 			crl::guard(this, [=] { startAddExistingEmojiFlow(); }),
 			&st::menuIconEmoji);
+		_menu->addAction(
+			tr::lng_emoji_adapt_sticker(tr::now),
+			crl::guard(this, [=] { startAdaptStickerToEmojiFlow(); }),
+			&st::menuIconStickerAdd);
 	} else {
 		_menu->addAction(
 			tr::lng_stickers_create_new(tr::now),
@@ -2722,4 +2727,36 @@ void StickerSetBox::Inner::startCreateNewEmojiFlow() {
 	Api::OpenCreateEmojiFlow(_show, identifier, onDone);
 }
 
+void StickerSetBox::Inner::startAdaptStickerToEmojiFlow() {
+	if (!hasAddCell()) {
+		return;
+	}
+	const auto panel = createPickerPanel(
+		ChatHelpers::TabbedSelector::Mode::StickersOnly,
+		0);
+	if (!panel) {
+		return;
+	}
+	const auto identifier = StickerSetIdentifier{
+		.id = _setId,
+		.accessHash = _setAccessHash,
+		.shortName = _setShortName,
+	};
+	const auto show = _show;
+	panel->selector()->fileChosen(
+	) | rpl::on_next([=, this](const ChatHelpers::FileChosen &chosen) {
+		const auto accepted = Api::AdaptStickerToEmoji(
+			show,
+			identifier,
+			chosen.document,
+			crl::guard(this, [=, this](MTPmessages_StickerSet result) {
+				applySet(result);
+			}));
+		if (accepted && _pickerPanel) {
+			_pickerPanel->hideAnimated();
+		}
+	}, panel->lifetime());
+	panel->showAnimated();
+}
+
 StickerSetBox::Inner::~Inner() = default;