MVP for a Pong game

src/lib/include/paradiso/bitmap.hpp

@@ -60,6 +60,7 @@ struct Bitmap final {
      * @return reference to itself
      */
     constexpr auto fill(const RGBA& color) noexcept {
+        change_count++;
         std::fill(data.begin(), data.end(), color);
         return *this;
     }
@@ -71,6 +72,7 @@ struct Bitmap final {
      * @return reference to pixel data at position
      */
     constexpr RGBA& pixel(std::integral auto x, std::integral auto y) {
+        change_count++;
         return data[y * size.width + x];
     }
 
@@ -85,8 +87,14 @@ struct Bitmap final {
         return data[y * size.width + x];
     }
 
+    constexpr void force_change() noexcept
+    {
+        change_count++;
+    } 
+
     Size size{.width = 0, .height = 0}; //!< extent of bitmap
     std::vector<RGBA> data{};           //!< data storage
+    std::uint64_t change_count{};
 };
 } // namespace paradiso