optimized enumeration of userpics

Telegram/SourceFiles/history.cpp

@@ -293,8 +293,8 @@ History::History(const PeerId &peerId) : width(0), height(0)
 	if (peer->isChannel() || (peer->isUser() && peer->asUser()->botInfo)) {
 		outboxReadBefore = INT_MAX;
 	}
-	for (int32 i = 0; i < OverviewCount; ++i) {
-		overviewCountData[i] = -1; // not loaded yet
+	for (auto &countData : overviewCountData) {
+		countData = -1; // not loaded yet
 	}
 }
 
@@ -309,6 +309,15 @@ void History::clearLastKeyboard() {
 	lastKeyboardFrom = 0;
 }
 
+bool History::canHaveFromPhotos() const {
+	if (peer->isUser() && !Adaptive::Wide()) {
+		return false;
+	} else if (isChannel() && asChannelHistory()->onlyImportant()) {
+		return false;
+	}
+	return true;
+}
+
 void History::setHasPendingResizedItems() {
 	_flags |= Flag::f_has_pending_resized_items;
 	Global::RefHandleHistoryUpdate().call();
@@ -6030,8 +6039,7 @@ void HistoryMessageForwarded::create(const HistoryMessageVia *via) const {
 }
 
 HistoryMessage::HistoryMessage(History *history, const MTPDmessage &msg) :
-	HistoryItem(history, msg.vid.v, msg.vflags.v, ::date(msg.vdate), msg.has_from_id() ? msg.vfrom_id.v : 0)
-, _text(st::msgMinWidth) {
+	HistoryItem(history, msg.vid.v, msg.vflags.v, ::date(msg.vdate), msg.has_from_id() ? msg.vfrom_id.v : 0) {
 	PeerId authorOriginalId = 0, fromOriginalId = 0;
 	MsgId originalId = 0;
 	if (msg.has_fwd_from() && msg.vfwd_from.type() == mtpc_messageFwdHeader) {
@@ -7540,9 +7548,7 @@ bool HistoryServiceMessage::updatePinnedText(const QString *pfrom, QString *ptex
 }
 
 HistoryServiceMessage::HistoryServiceMessage(History *history, const MTPDmessageService &msg) :
-	HistoryItem(history, msg.vid.v, mtpCastFlags(msg.vflags.v), ::date(msg.vdate), msg.has_from_id() ? msg.vfrom_id.v : 0)
-, _text(st::msgMinWidth)
-, _media(0) {
+	HistoryItem(history, msg.vid.v, mtpCastFlags(msg.vflags.v), ::date(msg.vdate), msg.has_from_id() ? msg.vfrom_id.v : 0) {
 	if (msg.has_reply_to_msg_id()) {
 		UpdateInterfaces(HistoryServicePinned::Bit());
 		MsgId pinnedMsgId = Get<HistoryServicePinned>()->msgId = msg.vreply_to_msg_id.v;

Telegram/SourceFiles/history.h

@@ -346,6 +346,10 @@ public:
 	bool updateTyping(uint64 ms, bool force = false);
 	void clearLastKeyboard();
 
+	// optimization for userpics displayed on the left
+	// if this returns false there is no need to even try to handle them
+	bool canHaveFromPhotos() const;
+
 	typedef QList<HistoryBlock*> Blocks;
 	Blocks blocks;
 
@@ -2717,8 +2721,8 @@ protected:
 	bool updatePinned(bool force = false);
 	bool updatePinnedText(const QString *pfrom = nullptr, QString *ptext = nullptr);
 
-	Text _text;
-	HistoryMedia *_media;
+	Text _text = { int(st::msgMinWidth) };
+	HistoryMedia *_media = nullptr;
 
 	int32 _textWidth, _textHeight;
 };

Telegram/SourceFiles/historywidget.cpp

@@ -94,32 +94,53 @@ void HistoryInner::repaintItem(const HistoryItem *item) {
 	}
 }
 
+namespace {
+	// helper binary search for an item in a list that is not completely below the given bottom of the visible area
+	// is applied once for blocks list in a history and once for items list in the found block
+	template <typename T>
+	int binarySearchBlocksOrItems(const T &list, int bottom) {
+		int start = 0, end = list.size();
+		while (end - start > 1) {
+			int middle = (start + end) / 2;
+			if (list.at(middle)->y >= bottom) {
+				end = middle;
+			} else {
+				start = middle;
+			}
+		}
+		return start;
+	}
+}
+
 template <typename Method>
 void HistoryInner::enumerateUserpicsInHistory(History *h, int htop, Method method) {
 	// no displayed messages in this history
-	if (htop < 0) return;
+	if (htop < 0 || h->isEmpty() || !h->canHaveFromPhotos() || _visibleAreaBottom <= htop) {
+		return;
+	}
 
 	// find and remember the bottom of an attached messages pack
 	// -1 means we didn't find an attached to previous message yet
 	int lowestAttachedItemBottom = -1;
 
-	int blockIndex = h->blocks.size();
-	int itemIndex = 0;
-	while (blockIndex > 0) {
-		HistoryBlock *block = h->blocks.at(--blockIndex);
-		itemIndex = block->items.size();
+	// binary search for blockIndex of the first block that is not completely below the visible area
+	int blockIndex = binarySearchBlocksOrItems(h->blocks, _visibleAreaBottom - htop);
 
-		int blocktop = htop + block->y;
-		while (itemIndex > 0) {
-			HistoryItem *item = block->items.at(--itemIndex);
+	// binary search for itemIndex of the first item that is not completely below the visible area
+	HistoryBlock *block = h->blocks.at(blockIndex);
+	int blocktop = htop + block->y;
+	int itemIndex = binarySearchBlocksOrItems(block->items, _visibleAreaBottom - blocktop);
+
+	while (true) {
+		while (itemIndex >= 0) {
+			HistoryItem *item = block->items.at(itemIndex--);
 			int itemtop = blocktop + item->y;
 			int itembottom = itemtop + item->height();
 
-			// skip items that are below the visible area
-			if (itemtop >= _visibleAreaBottom) {
-				continue;
-			}
+			// binary search should've skipped all the items that are below the visible area
+			t_assert(itemtop < _visibleAreaBottom);
 
+			// skip all service messages
 			if (HistoryMessage *message = item->toHistoryMessage()) {
 				if (lowestAttachedItemBottom < 0 && message->isAttachedToPrevious()) {
 					lowestAttachedItemBottom = itembottom - message->marginBottom();
@@ -131,15 +152,21 @@ void HistoryInner::enumerateUserpicsInHistory(History *h, int htop, Method metho
 					if (lowestAttachedItemBottom < 0) {
 						lowestAttachedItemBottom = itembottom - message->marginBottom();
 					}
-					int userpicTop = qMin(qMax(itemtop + message->marginTop(), _visibleAreaTop + st::msgMargin.left()), lowestAttachedItemBottom - int(st::msgPhotoSize));
+					// attach userpic to the top of the visible area with the same margin as it is from the left side
+					int userpicTop = qMax(itemtop + message->marginTop(), _visibleAreaTop + st::msgMargin.left());
+
+					// do not let the userpic go below the attached messages pack bottom line
+					userpicTop = qMin(userpicTop, lowestAttachedItemBottom - int(st::msgPhotoSize));
 
 					// call the template callback function that was passed
 					// and return if it finished everything it needed
 					if (!method(message, userpicTop)) {
 						return;
 					}
+				}
 
-					// forget the found bottom of the pack, search for the next one from scratch
+				// forget the found bottom of the pack, search for the next one from scratch
+				if (!message->isAttachedToPrevious()) {
 					lowestAttachedItemBottom = -1;
 				}
 			}
@@ -154,6 +181,14 @@ void HistoryInner::enumerateUserpicsInHistory(History *h, int htop, Method metho
 		if (blocktop <= _visibleAreaTop) {
 			return;
 		}
+
+		if (--blockIndex < 0) {
+			return;
+		} else {
+			block = h->blocks.at(blockIndex);
+			blocktop = htop + block->y;
+			itemIndex = block->items.size() - 1;
+		}
 	}
 }
 

Telegram/SourceFiles/layout.cpp

@@ -1066,12 +1066,7 @@ namespace {
 	}
 }
 
-LayoutOverviewLink::LayoutOverviewLink(HistoryMedia *media, HistoryItem *parent) : LayoutMediaItem(OverviewItemInfo::Bit(), parent)
-, _titlew(0)
-, _page(0)
-, _pixw(0)
-, _pixh(0)
-, _text(st::msgMinWidth) {
+LayoutOverviewLink::LayoutOverviewLink(HistoryMedia *media, HistoryItem *parent) : LayoutMediaItem(OverviewItemInfo::Bit(), parent) {
 	QString text = _parent->originalText();
 	EntitiesInText entities = _parent->originalEntities();
 

Telegram/SourceFiles/layout.h

@@ -440,10 +440,11 @@ private:
 	TextLinkPtr _photol;
 
 	QString _title, _letter;
-	int32 _titlew;
-	WebPageData *_page;
-	int32 _pixw, _pixh;
-	Text _text;
+	int _titlew = 0;
+	WebPageData *_page = nullptr;
+	int _pixw = 0;
+	int _pixh = 0;
+	Text _text = { int(st::msgMinWidth) };
 
 	struct Link {
 		Link() : width(0) {

Telegram/Telegram.vcxproj

@@ -89,6 +89,7 @@
       <ImageHasSafeExceptionHandlers />
       <IgnoreSpecificDefaultLibraries>LIBCMT</IgnoreSpecificDefaultLibraries>
       <ImportLibrary>$(SolutionDir)$(Platform)\$(Configuration)Intermediate\$(TargetName).lib</ImportLibrary>
+      <AdditionalOptions>/ignore:4099 %(AdditionalOptions)</AdditionalOptions>
     </Link>
     <CustomBuildStep>
     </CustomBuildStep>