Initial commit: DayZ memory C++ port with DMA backend and overlay

src/Web/MapTileService.h

@@ -0,0 +1,36 @@
+#pragma once
+#include <cstdint>
+#include <mutex>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "Web/MapRegistry.h"
+
+// -------------------------------------------------------------------------
+// MapTileService
+// Loads a full map PNG on first request, caches it in memory, and serves
+// 512×512 tiles on demand (nearest-neighbour resampled).
+// -------------------------------------------------------------------------
+
+class MapTileService {
+public:
+    /// Return PNG-encoded bytes for the requested tile.
+    /// errCode is set to one of: 200, 400, 404, 500.
+    /// An empty vector is returned for any non-200 result.
+    std::vector<uint8_t> GetTile(const MapInfo& map, int tileX, int tileY,
+                                 int& errCode);
+
+private:
+    struct Image {
+        std::vector<uint8_t> pixels; // RGBA, row-major
+        int w = 0;
+        int h = 0;
+    };
+
+    std::mutex                              m_mutex;
+    std::unordered_map<std::string, Image>  m_cache; // mapId → loaded image
+
+    /// Return cached Image or attempt to load it.  Returns nullptr on failure.
+    const Image* LoadOrGet(const std::string& mapId);
+};