Add ruby bindings for internal structures, allow better controlled localization

include/window/window.h

@@ -83,8 +83,6 @@ struct Event {
 struct Animation {
   std::vector<uint64_t> frames;
   float frame_rate;
-  bool loop;
-  int reference_count = 0;
 
   ~Animation() {
     for (uint64_t frame_id : frames)
@@ -104,20 +102,20 @@ public:
   ~Window();
 
   // Rendering functions
-  uint64_t load_image(const char *path, float alpha = 1.0f, bool pixel_art = false);
+  uint64_t load_image(const char *path, bool pixel_art);
   Vec2<float> get_image_size(uint64_t image_id);
 
-  uint64_t load_font(const char *path, int font_size, bool bold = false, bool italic = false, bool underline = false, bool pixel_art = false);
+  uint64_t load_font(const char *path, int font_size, bool bold, bool italic, bool underline, bool pixel_art);
 
   // text is copied internally, so it can be free'd by the caller after the text is created.
   uint64_t create_text(uint64_t font_id, const char *text, uint32_t length, Color color);
   Vec2<float> get_text_size(uint64_t text_id);
 
-  bool write(uint64_t text_id, Vec2<float> position, float z, float angle = 0.0f, Vec2<float> scale = {1.0f, 1.0f});
+  bool write(uint64_t text_id, Vec2<float> position, float z, float angle, Vec2<float> scale, float alpha);
 
-  bool draw(uint64_t image_id, Vec2<float> position, float z, float angle = 0.0f, Vec2<float> scale = {1.0f, 1.0f});
+  bool draw(uint64_t image_id, Vec2<float> position, float z, float angle, Vec2<float> scale, float alpha);
 
-  bool draw_rect(Rect rect, Color color, float z, float angle = 0.0f);
+  bool draw_rect(Rect rect, Color color, float z, float angle, Vec2<float> scale, float alpha);
 
   void render(); // the rest of the calls only build the instruction list, this actually renders everything added to the screen (following z order)
 
@@ -170,6 +168,7 @@ private:
     float z;
     float angle;
     Vec2<float> scale;
+    float alpha;
 
     union {
       struct {