sync gif emotes of same length

src/messages/Image.cpp

@@ -41,6 +41,14 @@ namespace detail {
                 getApp()->emotes->gifTimer.signal.connect(
                     [this] { this->advance(); });
         }
+
+        auto totalLength = std::accumulate(
+            this->items_.begin(), this->items_.end(), 0UL,
+            [](auto init, auto &&frame) { return init + frame.duration; });
+
+        this->durationOffset_ = std::min<int>(
+            int(getApp()->emotes->gifTimer.position() % totalLength), 60000);
+        this->processOffset();
     }
 
     Frames::~Frames()
@@ -58,17 +66,16 @@ namespace detail {
 
     void Frames::advance()
     {
-        this->durationOffset_ += GIF_FRAME_LENGTH;
+        this->durationOffset_ += gifFrameLength;
+        this->processOffset();
+    }
 
+    void Frames::processOffset()
+    {
         while (true)
         {
             this->index_ %= this->items_.size();
 
-            // TODO: Figure out what this was supposed to achieve
-            // if (this->index_ >= this->items_.size()) {
-            //     this->index_ = this->index_;
-            // }
-
             if (this->durationOffset_ > this->items_[this->index_].duration)
             {
                 this->durationOffset_ -= this->items_[this->index_].duration;

src/messages/Image.hpp

@@ -35,6 +35,7 @@ namespace detail {
         boost::optional<QPixmap> first() const;
 
     private:
+        void processOffset();
         QVector<Frame<QPixmap>> items_;
         int index_{0};
         int durationOffset_{0};

src/singletons/Emotes.hpp

@@ -2,8 +2,6 @@
 
 #include "common/Singleton.hpp"
 
-#define GIF_FRAME_LENGTH 33
-
 #include "providers/bttv/BttvEmotes.hpp"
 #include "providers/emoji/Emojis.hpp"
 #include "providers/ffz/FfzEmotes.hpp"

src/singletons/helper/GifTimer.cpp

@@ -22,6 +22,7 @@ void GIFTimer::initialize()
             qApp->activeWindow() == nullptr)
             return;
 
+        this->position_ += gifFrameLength;
         this->signal.invoke();
         getApp()->windows->repaintGifEmotes();
     });

src/singletons/helper/GifTimer.hpp

@@ -5,15 +5,22 @@
 
 namespace chatterino {
 
+constexpr long unsigned gifFrameLength = 33;
+
 class GIFTimer
 {
 public:
     void initialize();
 
     pajlada::Signals::NoArgSignal signal;
+    long unsigned position()
+    {
+        return this->position_;
+    }
 
 private:
     QTimer timer;
+    long unsigned position_{};
 };
 
 }  // namespace chatterino