1 files changed, 40 insertions, 0 deletions
diff --git a/source/game/StarImageMetadataDatabase.hpp b/source/game/StarImageMetadataDatabase.hpp
new file mode 100644
index 0000000..1f29da6
--- /dev/null
+++ b/source/game/StarImageMetadataDatabase.hpp
@@ -0,0 +1,40 @@
+#ifndef STAR_IMAGE_METADATA_DATABASE_HPP
+#define STAR_IMAGE_METADATA_DATABASE_HPP
+
+#include "StarRect.hpp"
+#include "StarMap.hpp"
+#include "StarString.hpp"
+#include "StarThread.hpp"
+
+namespace Star {
+
+STAR_CLASS(ImageMetadataDatabase);
+
+// Caches image size, image spaces, and nonEmptyRegion completely until a
+// reload, does not expire cached values in a TTL based way like Assets,
+// because they are expensive to compute and cheap to keep around.
+class ImageMetadataDatabase {
+public:
+  Vec2U imageSize(String const& path) const;
+  List<Vec2I> imageSpaces(String const& path, Vec2F position, float fillLimit, bool flip) const;
+  RectU nonEmptyRegion(String const& path) const;
+
+private:
+  // Removes image processing directives that don't affect image spaces /
+  // non-empty regions.
+  static String filterProcessing(String const& path);
+
+  Vec2U calculateImageSize(String const& path) const;
+
+  // Path, position, fillLimit, and flip
+  typedef tuple<String, Vec2I, float, bool> SpacesEntry;
+
+  mutable Mutex m_mutex;
+  mutable StringMap<Vec2U> m_sizeCache;
+  mutable HashMap<SpacesEntry, List<Vec2I>> m_spacesCache;
+  mutable StringMap<RectU> m_regionCache;
+};
+
+}
+
+#endif