优化画布类

source/EngineFrame/Component/Canvas.h

@@ -4,20 +4,51 @@
 #include "EngineFrame/Component/Sprite.h"
 class Canvas : public Actor
 {
+    struct ImgKey
+    {
+        std::string img;
+        int index;
+
+        bool operator<(const ImgKey &other) const
+        {
+            if (img != other.img)
+            {
+                return img < other.img; // 字符串按字典序比较
+            }
+            return index < other.index; // 字符串相同则比较index
+        }
+    };
+    struct DrawInfo
+    {
+        ImgKey texture;
+        SDL_FRect rect = {0, 0, 0, 0};
+    };
+
 private:
     /**纹理 */
     RefPtr<Texture> m_texture = nullptr;
-    /**精灵 */
-    RefPtr<Sprite> m_sprite = nullptr;
+    /**大小 */
+    VecSize m_size;
+    /**渲染大小 */
+    SDL_Rect m_renderRect;
+    SDL_FRect m_rect;
     /**脏标记 */
     bool m_dirty = true;
     /**FBO */
     GLuint m_fbo = 0;
+    /**绘制纹理集 */
+    std::map<ImgKey, RefPtr<Texture>> m_imgMap;
+    /**绘制队列 */
+    std::vector<DrawInfo> m_drawQueue;
 
 public:
     Canvas(VecSize size);
 
     void PreRender() override;
     void Render() override;
-    void AddChild(RefPtr<BaseNode> child) override;
+    void Blend();
+
+    void DrawImg(std::string img, int index, Vec2 pos);
+    void DrawImg(std::string img, int index, SDL_FRect rect);
+    void Clear();
 };