added limit to cached username colors (#2515)

src/common/ChannelChatters.cpp

@@ -7,6 +7,7 @@ namespace chatterino {
 
 ChannelChatters::ChannelChatters(Channel &channel)
     : channel_(channel)
+    , chatterColors_(ChannelChatters::maxChatterColorCount)
 {
 }
 
@@ -72,22 +73,23 @@ void ChannelChatters::setChatters(UsernameSet &&set)
 
 const QColor ChannelChatters::getUserColor(const QString &user)
 {
-    const auto chatterColors = this->chatterColors_.accessConst();
+    const auto chatterColors = this->chatterColors_.access();
 
-    const auto search = chatterColors->find(user.toLower());
-    if (search == chatterColors->end())
+    auto lowerUser = user.toLower();
+
+    if (!chatterColors->exists(lowerUser))
     {
         // Returns an invalid color so we can decide not to override `textColor`
         return QColor();
     }
 
-    return search->second;
+    return QColor::fromRgb(chatterColors->get(lowerUser));
 }
 
 void ChannelChatters::setUserColor(const QString &user, const QColor &color)
 {
     const auto chatterColors = this->chatterColors_.access();
-    chatterColors->insert_or_assign(user.toLower(), color);
+    chatterColors->put(user.toLower(), color.rgb());
 }
 
 }  // namespace chatterino

src/common/ChannelChatters.hpp

@@ -3,6 +3,9 @@
 #include "common/Channel.hpp"
 #include "common/UniqueAccess.hpp"
 #include "common/UsernameSet.hpp"
+#include "util/QStringHash.hpp"
+
+#include "lrucache/lrucache.hpp"
 
 namespace chatterino {
 
@@ -22,11 +25,13 @@ public:
     void setUserColor(const QString &user, const QColor &color);
 
 private:
+    static constexpr int maxChatterColorCount = 5000;
+
     Channel &channel_;
 
     // maps 2 char prefix to set of names
     UniqueAccess<UsernameSet> chatters_;
-    UniqueAccess<std::map<QString, QColor>> chatterColors_;
+    UniqueAccess<cache::lru_cache<QString, QRgb>> chatterColors_;
 
     // combines multiple joins/parts into one message
     UniqueAccess<QStringList> joinedUsers_;