redesigned display peripheral

DisplaySDL.hpp

@@ -2,16 +2,22 @@
 
 #include "Peripherals.hpp"
 
+#include <array>
 #include <cstdint>
+#include <memory>
 #include <SDL2/SDL_video.h>
 
 class DisplaySDL : public chocochip8::Display {
 public:
   DisplaySDL(int w, int h, uint32_t fgCol = 0xffffff, uint32_t bgCol = 0x000000);
   ~DisplaySDL() override;
+  void clear() override;
+  int blit(const chocochip8::Scanline &scanline, int y) override;
   void updateWindow() const;
 
 private:
+  using Framebuffer = std::array<chocochip8::Scanline, chocochip8::gcHeight>;
+  std::unique_ptr<Framebuffer> mpFramebuffer;
   SDL_Window *mpWindow;
   Uint32 mFgColor;
   Uint32 mBgColor;