Add Tilemap functionality with creation, updating, and rendering capabilities; implement data retrieval for individual tiles, enhancing graphics management in the application.

src/app/gfx/tilemap.h

@@ -0,0 +1,34 @@
+#ifndef YAZE_GFX_TILEMAP_H
+#define YAZE_GFX_TILEMAP_H
+
+#include "app/gfx/bitmap.h"
+#include "absl/container/flat_hash_map.h"
+
+namespace yaze {
+namespace gfx {
+
+struct Pair {
+  int x;
+  int y;
+};
+
+struct Tilemap {
+  Bitmap atlas;
+  absl::flat_hash_map<int, Bitmap> tile_bitmaps;
+  Pair tile_size;
+  Pair map_size;
+};
+
+Tilemap CreateTilemap(std::vector<uint8_t> &data, int width, int height,
+                      int tile_size, int num_tiles, SnesPalette &palette);
+
+void UpdateTilemap(Tilemap &tilemap, const std::vector<uint8_t> &data);
+
+void RenderTile(Tilemap &tilemap, int tile_id);
+
+std::vector<uint8_t> GetTilemapData(Tilemap &tilemap, int tile_id);
+
+}  // namespace gfx
+}  // namespace yaze
+
+#endif  // YAZE_GFX_TILEMAP_H