better smart ptr owner semantic

inc/basic_widgets/core/draw.hpp

@@ -16,7 +16,7 @@ namespace bwidgets
 
     [[nodiscard]] auto aa(const Color&, int, float) noexcept -> Color;
     [[nodiscard]] auto filled_circle(const Color&, int              resolution,
-                                     std::shared_ptr<Renderer>, int aa_pixels = 3)
+                                     Renderer*, int aa_pixels = 3)
       -> std::shared_ptr<Texture>;
     void set_pixels_color(
       Texture*,

inc/basic_widgets/w/base/widget.hpp

@@ -34,7 +34,7 @@ namespace bwidgets
         [[nodiscard]] virtual auto size() const noexcept -> Size = 0;
 
         virtual auto render() -> Widget* final;
-        virtual auto renderer(const std::shared_ptr<Renderer>&) -> Widget* final;
+        virtual auto renderer(std::shared_ptr<Renderer>) -> Widget* final;
         virtual auto viewport(const SDL_Rect&) -> Widget* final;
         [[nodiscard]] virtual auto viewport() const -> const SDL_Rect& final;
     };

inc/basic_widgets/w/feat/font_handler.hpp

@@ -25,7 +25,7 @@ namespace bwidgets
 
         virtual ~FontHandler() noexcept = default;
 
-        virtual inline auto font(const std::shared_ptr<Font>& f) -> FontHandler* final
+        virtual inline auto font(std::shared_ptr<Font> f) -> FontHandler* final
         {
             if (f != nullptr
                 && (f != _font || f->family_name != _font->family_name

src/w/base/layout.cpp

@@ -4,10 +4,10 @@ using namespace bwidgets;
 
 const Size Layout::default_margins {8, 8};
 
-auto Layout::add_widget(const std::shared_ptr<Widget>& widget_ptr) -> Layout*
+auto Layout::add_widget(std::unique_ptr<Widget> widget_ptr) -> Layout*
 {
     widget_ptr->renderer(_renderer);
-    _widgets.emplace_back(widget_ptr);
+    _widgets.emplace_back(std::move(widget_ptr));
     _update_layout(_viewport);
     return this;
 }

src/w/base/widget.cpp

@@ -55,7 +55,7 @@ auto Widget::render() -> Widget*
     return this;
 }
 
-auto Widget::renderer(const std::shared_ptr<Renderer>& r) -> Widget*
+auto Widget::renderer(std::shared_ptr<Renderer> r) -> Widget*
 {
     if (r != _renderer) {
         _handle_renderer_change(r);