implement regular image import

src/image.h

@@ -24,6 +24,13 @@ public:
     {
         std::copy(data, data + size(), m_data.get());
     }
+    void destroy()
+    {
+        width = 0;
+        height = 0;
+        comp = 0;
+        m_data.reset();
+    }
     void flip();
     void create() { m_data = std::make_unique<uint8_t[]>(size()); }
     Image resize(int w, int h);