SPECIAL LITTLE WARNING FOR STUPID LITTLE CHUDS WHO CAN'T READ

src/anm2/anm2.cpp

@@ -146,6 +146,30 @@ namespace anm2ed::anm2
     }
   }
 
+  bool Anm2::has_special_interpolated_frames() const
+  {
+    auto item_has_special_frames = [](const Item& item)
+    {
+      for (const auto& frame : item.frames)
+      {
+        auto interpolation = frame.interpolation;
+        if (interpolation != Frame::Interpolation::NONE && interpolation != Frame::Interpolation::LINEAR) return true;
+      }
+      return false;
+    };
+
+    for (const auto& animation : animations.items)
+    {
+      if (item_has_special_frames(animation.rootAnimation)) return true;
+      for (const auto& item : animation.layerAnimations | std::views::values)
+        if (item_has_special_frames(item)) return true;
+      for (const auto& item : animation.nullAnimations | std::views::values)
+        if (item_has_special_frames(item)) return true;
+    }
+
+    return false;
+  }
+
   Anm2::Anm2(const std::filesystem::path& path, std::string* errorString)
   {
     XMLDocument document;

src/anm2/anm2.hpp

@@ -82,6 +82,7 @@ namespace anm2ed::anm2
     bool animations_deserialize(const std::string&, int, std::set<int>&, std::string* = nullptr);
     Frame frame_effective(int, const Frame&) const;
     glm::vec4 animation_rect(Animation&, bool) const;
+    bool has_special_interpolated_frames() const;
     void bake_special_interpolated_frames(int, bool, bool);
 
     Item* item_get(int, Type, int = -1);

src/anm2/item.cpp

@@ -295,7 +295,11 @@ namespace anm2ed::anm2
     if (!vector::in_bounds(frames, index)) return;
 
     auto original = frames[index];
-    if (original.duration == FRAME_DURATION_MIN) return;
+    if (original.duration == FRAME_DURATION_MIN)
+    {
+      frames[index].interpolation = Frame::Interpolation::NONE;
+      return;
+    }
 
     auto nextFrame = vector::in_bounds(frames, index + 1) ? frames[index + 1] : original;