refactor Brush to be used in shared_ptr

src/image.cpp

@@ -7,18 +7,25 @@
 
 bool Image::load(std::string filename)
 {
-    stbi_set_flip_vertically_on_load(false);
-    Asset file;
-    if (!(file.open(filename.c_str()) && file.read_all()))
+    if (Asset::is_asset(filename))
     {
+        Asset file;
+        if (!(file.open(filename.c_str()) && file.read_all()))
+        {
+            file.close();
+            return false;
+        }
+        stbi_set_flip_vertically_on_load(false);
+        uint8_t* buffer = stbi_load_from_memory(file.m_data, file.m_len, &width, &height, nullptr, 4);
         file.close();
-        return false;
+        comp = 4;
+        m_data = std::unique_ptr<uint8_t[]>(buffer);
+        return true;
+    }
+    else
+    {
+        return load_file(filename);
     }
-    uint8_t* buffer = stbi_load_from_memory(file.m_data, file.m_len, &width, &height, nullptr, 4);
-    file.close();
-    comp = 4;
-    m_data = std::unique_ptr<uint8_t[]>(buffer);
-    return true;
 }
 
 bool Image::load_file(std::string filename)