1 files changed, 68 insertions, 0 deletions
diff --git a/src/mbgl/text/glyph_manager.hpp b/src/mbgl/text/glyph_manager.hpp
new file mode 100644
index 0000000000..00df079462
--- /dev/null
+++ b/src/mbgl/text/glyph_manager.hpp
@@ -0,0 +1,68 @@
+#pragma once
+
+#include <mbgl/text/glyph.hpp>
+#include <mbgl/text/glyph_manager_observer.hpp>
+#include <mbgl/text/glyph_range.hpp>
+#include <mbgl/util/noncopyable.hpp>
+#include <mbgl/util/font_stack.hpp>
+#include <mbgl/util/immutable.hpp>
+
+#include <string>
+#include <unordered_map>
+
+namespace mbgl {
+
+class FileSource;
+class AsyncRequest;
+class Response;
+
+class GlyphRequestor {
+public:
+    virtual ~GlyphRequestor() = default;
+    virtual void onGlyphsAvailable(GlyphMap) = 0;
+};
+
+class GlyphManager : public util::noncopyable {
+public:
+    GlyphManager(FileSource&);
+    ~GlyphManager();
+
+    // Workers send a `getGlyphs` message to the main thread once they have determined
+    // their `GlyphDependencies`. If all glyphs are already locally available, GlyphManager
+    // will provide them to the requestor immediately. Otherwise, it makes a request on the
+    // FileSource is made for each range neeed, and notifies the observer when all are
+    // complete.
+    void getGlyphs(GlyphRequestor&, GlyphDependencies);
+    void removeRequestor(GlyphRequestor&);
+
+    void setURL(const std::string& url) {
+        glyphURL = url;
+    }
+
+    void setObserver(GlyphManagerObserver*);
+
+private:
+    FileSource& fileSource;
+    std::string glyphURL;
+
+    struct GlyphRequest {
+        bool parsed = false;
+        std::unique_ptr<AsyncRequest> req;
+        std::unordered_map<GlyphRequestor*, std::shared_ptr<GlyphDependencies>> requestors;
+    };
+
+    struct Entry {
+        std::map<GlyphRange, GlyphRequest> ranges;
+        std::map<GlyphID, Immutable<Glyph>> glyphs;
+    };
+
+    std::unordered_map<FontStack, Entry, FontStackHash> entries;
+
+    GlyphRequest& requestRange(Entry&, const FontStack&, const GlyphRange&);
+    void processResponse(const Response&, const FontStack&, const GlyphRange&);
+    void notify(GlyphRequestor&, const GlyphDependencies&);
+
+    GlyphManagerObserver* observer = nullptr;
+};
+
+} // namespace mbgl