Add location tracking to PhotoData

Add persistent file location storage for downloaded photos,
similar to DocumentData. This allows the app to remember
where a photo was saved and reuse that path.

Co-Authored-By: GLM-5 <contact@zhipuai.cn>

Telegram/SourceFiles/data/data_photo.cpp

@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "data/data_photo.h"
 
+#include "data/data_document.h"
 #include "data/data_session.h"
 #include "data/data_reply_preview.h"
 #include "data/data_photo_media.h"
@@ -15,6 +16,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/history_item.h"
 #include "media/streaming/media_streaming_loader_local.h"
 #include "media/streaming/media_streaming_loader_mtproto.h"
+#include "storage/storage_account.h"
 #include "storage/file_download.h"
 #include "core/application.h"
 
@@ -475,6 +477,28 @@ int PhotoData::height() const {
 	return _images[PhotoSizeIndex(PhotoSize::Large)].location.height();
 }
 
+MediaKey PhotoData::mediaKey() const {
+	return ::mediaKey(UnknownFileLocation, _dc, id);
+}
+
+const Core::FileLocation &PhotoData::location(bool check) const {
+	if (check && !_location.check()) {
+		const auto location = session().local().readFileLocation(mediaKey());
+		const auto that = const_cast<PhotoData*>(this);
+		if (!location.inMediaCache()) {
+			that->_location = location;
+		}
+	}
+	return _location;
+}
+
+void PhotoData::setLocation(const Core::FileLocation &loc) {
+	if (!loc.inMediaCache() && loc.check()) {
+		_location = loc;
+		session().local().writeFileLocation(mediaKey(), _location);
+	}
+}
+
 Data::CloudFile &PhotoData::videoFile(PhotoSize size) {
 	Expects(_videoSizes != nullptr);
 

Telegram/SourceFiles/data/data_photo.h

@@ -9,6 +9,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "data/data_types.h"
 #include "data/data_cloud_file.h"
+#include "core/file_location.h"
 
 namespace Main {
 class Session;
@@ -160,6 +161,10 @@ public:
 	[[nodiscard]] int width() const;
 	[[nodiscard]] int height() const;
 
+	[[nodiscard]] MediaKey mediaKey() const;
+	[[nodiscard]] const Core::FileLocation &location(bool check) const;
+	void setLocation(const Core::FileLocation &loc);
+
 	PhotoId id = 0;
 
 	PeerData *peer = nullptr; // for chat and channel photos connection
@@ -195,4 +200,6 @@ private:
 
 	not_null<Data::Session*> _owner;
 
+	Core::FileLocation _location;
+
 };