Fix major incorrect usage of mrb class definitions causing segfaults

src/window/window.cc

@@ -42,16 +42,13 @@ void Window::update(Vec2<float> new_size, const char *new_title) {
 
 Window::~Window() {
   for (auto &tex : image_pool.all())
-    if (tex.texture)
-      SDL_DestroyTexture(tex.texture);
+    SDL_DestroyTexture(tex->texture);
 
   for (auto tex : text_pool.all())
-    if (tex)
-      SDL_DestroyTexture(tex);
+    SDL_DestroyTexture(tex->texture);
 
   for (auto &f : font_pool.all())
-    if (f.font)
-      TTF_CloseFont(f.font);
+    TTF_CloseFont(f->font);
 
   SDL_DestroyRenderer(renderer);
   SDL_DestroyWindow(window);
@@ -76,7 +73,15 @@ int Window::load_image(const char *path, float alpha, bool pixel_art) {
   float w, h;
   SDL_GetTextureSize(texture, &w, &h);
 
-  return image_pool.acquire({texture, {w, h}});
+  Image *img = new Image{texture, {w, h}};
+  int id = image_pool.acquire(img);
+  image_pool.use(id);
+
+  return id;
+}
+
+void Window::use_image(int image_id) {
+  image_pool.use(image_id);
 }
 
 Vec2<float> Window::get_image_size(int image_id) {
@@ -84,7 +89,7 @@ Vec2<float> Window::get_image_size(int image_id) {
     fprintf(stderr, "Invalid image ID: %d\n", image_id);
     return {0, 0};
   }
-  return {image_pool[image_id].size.x, image_pool[image_id].size.y};
+  return image_pool[image_id]->size;
 }
 
 void Window::unload_image(int image_id) {
@@ -93,7 +98,7 @@ void Window::unload_image(int image_id) {
     return;
   }
 
-  SDL_DestroyTexture(image_pool[image_id].texture);
+  SDL_DestroyTexture(image_pool[image_id]->texture);
   image_pool.release(image_id);
 }
 
@@ -115,7 +120,15 @@ int Window::load_font(const char *path, int font_size, bool bold, bool italic, b
 
   TTF_SetFontStyle(font, style);
 
-  return font_pool.acquire({font, pixel_art});
+  Font *f = new Font{font, pixel_art};
+  int id = font_pool.acquire(f);
+  font_pool.use(id);
+
+  return id;
+}
+
+void Window::use_font(int font_id) {
+  font_pool.use(font_id);
 }
 
 void Window::unload_font(int font_id) {
@@ -124,7 +137,7 @@ void Window::unload_font(int font_id) {
     return;
   }
 
-  TTF_CloseFont(font_pool[font_id].font);
+  TTF_CloseFont(font_pool[font_id]->font);
   font_pool.release(font_id);
 }
 
@@ -135,7 +148,7 @@ int Window::create_text(int font_id, const char *text, uint32_t length, Color co
   }
 
   SDL_Color sdl_color = {color.r, color.g, color.b, color.a};
-  SDL_Surface *surface = TTF_RenderText_Solid(font_pool[font_id].font, text, length, sdl_color);
+  SDL_Surface *surface = TTF_RenderText_Solid(font_pool[font_id]->font, text, length, sdl_color);
 
   if (surface == nullptr) {
     fprintf(stderr, "Failed to create text surface: %s\n", SDL_GetError());
@@ -150,10 +163,17 @@ int Window::create_text(int font_id, const char *text, uint32_t length, Color co
     return UINT32_MAX;
   }
 
-  if (font_pool[font_id].pixel_art)
+  if (font_pool[font_id]->pixel_art)
     SDL_SetTextureScaleMode(texture, SDL_SCALEMODE_NEAREST);
 
-  return text_pool.acquire(texture);
+  float w, h;
+  SDL_GetTextureSize(texture, &w, &h);
+
+  Text *t = new Text{texture, {w, h}};
+  int id = text_pool.acquire(t);
+  text_pool.use(id);
+
+  return id;
 }
 
 Vec2<float> Window::get_text_size(int text_id) {
@@ -161,9 +181,7 @@ Vec2<float> Window::get_text_size(int text_id) {
     fprintf(stderr, "Invalid text ID: %d\n", text_id);
     return {0, 0};
   }
-  float w, h;
-  SDL_GetTextureSize(text_pool[text_id], &w, &h);
-  return {w, h};
+  return text_pool[text_id]->size;
 }
 
 void Window::unload_text(int text_id) {
@@ -172,7 +190,7 @@ void Window::unload_text(int text_id) {
     return;
   }
 
-  SDL_DestroyTexture(text_pool[text_id]);
+  SDL_DestroyTexture(text_pool[text_id]->texture);
   text_pool.release(text_id);
 }
 
@@ -275,7 +293,8 @@ void Window::render() {
   for (const RenderInstruction &instruction : render_instructions) {
     switch (instruction.type) {
     case RenderInstruction::DRAW_TEXT: {
-      SDL_Texture *texture = text_pool[instruction.draw_text.text_id];
+      Text *text = text_pool[instruction.draw_text.text_id];
+      SDL_Texture *texture = text->texture;
 
       SDL_FlipMode flip = SDL_FLIP_NONE;
 
@@ -287,14 +306,12 @@ void Window::render() {
       float scale_x = std::abs(instruction.scale.x) * scale;
       float scale_y = std::abs(instruction.scale.y) * scale;
 
-      float w, h;
-      SDL_GetTextureSize(texture, &w, &h);
-
       SDL_FRect dst_rect;
       dst_rect.x = instruction.draw_text.position.x * scale + offset.x;
       dst_rect.y = instruction.draw_text.position.y * scale + offset.y;
-      dst_rect.w = scale_x * w;
-      dst_rect.h = scale_y * h;
+
+      dst_rect.w = scale_x * text->size.x;
+      dst_rect.h = scale_y * text->size.y;
 
       SDL_RenderTextureRotated(
         renderer,
@@ -308,7 +325,7 @@ void Window::render() {
     } break;
 
     case RenderInstruction::DRAW_IMAGE: {
-      Image image = image_pool[instruction.draw_image.image_id];
+      Image *image = image_pool[instruction.draw_image.image_id];
 
       SDL_FlipMode flip = SDL_FLIP_NONE;
 
@@ -323,12 +340,12 @@ void Window::render() {
       SDL_FRect dst_rect;
       dst_rect.x = instruction.draw_image.position.x * scale + offset.x;
       dst_rect.y = instruction.draw_image.position.y * scale + offset.y;
-      dst_rect.w = scale_x * image.size.x;
-      dst_rect.h = scale_y * image.size.y;
+      dst_rect.w = scale_x * image->size.x;
+      dst_rect.h = scale_y * image->size.y;
 
       SDL_RenderTextureRotated(
         renderer,
-        image.texture,
+        image->texture,
         nullptr,
         &dst_rect,
         instruction.angle,