1 files changed, 95 insertions, 0 deletions
diff --git a/include/mbgl/text/glyph_store.hpp b/include/mbgl/text/glyph_store.hpp
new file mode 100644
index 0000000000..9c874b31b0
--- /dev/null
+++ b/include/mbgl/text/glyph_store.hpp
@@ -0,0 +1,95 @@
+#ifndef MBGL_TEXT_GLYPH_STORE
+#define MBGL_TEXT_GLYPH_STORE
+
+#include <mbgl/text/glyph.hpp>
+#include <mbgl/util/pbf.hpp>
+
+#include <cstdint>
+#include <vector>
+#include <future>
+#include <map>
+#include <set>
+#include <unordered_map>
+
+namespace mbgl {
+
+
+class SDFGlyph {
+public:
+    uint32_t id = 0;
+
+    // A signed distance field of the glyph with a border of 3 pixels.
+    std::string bitmap;
+
+    // Glyph metrics
+    GlyphMetrics metrics;
+};
+
+class FontStack {
+public:
+    void insert(uint32_t id, const SDFGlyph &glyph);
+    const std::map<uint32_t, GlyphMetrics> &getMetrics() const;
+    const std::map<uint32_t, SDFGlyph> &getSDFs() const;
+    const Shaping getShaping(const std::u32string &string,
+                             const float &maxWidth,
+                             const float &lineHeight,
+                             const float &alignment,
+                             const float &verticalAlignment,
+                             const float &letterSpacing) const;
+    void lineWrap(Shaping &shaping,
+                     const float &lineHeight,
+                     const float &maxWidth,
+                     const float &alignment,
+                     const float &verticalAlignment) const;
+
+private:
+    std::map<uint32_t, std::string> bitmaps;
+    std::map<uint32_t, GlyphMetrics> metrics;
+    std::map<uint32_t, SDFGlyph> sdfs;
+    mutable std::mutex mtx;
+};
+
+class GlyphPBF {
+public:
+    GlyphPBF(const std::string &glyphURL, const std::string &fontStack, GlyphRange glyphRange);
+
+    void parse(FontStack &stack);
+
+    std::shared_future<GlyphPBF &> getFuture();
+
+private:
+    std::string data;
+    std::promise<GlyphPBF &> promise;
+    std::shared_future<GlyphPBF &> future;
+    std::mutex mtx;
+};
+
+// Manages Glyphrange PBF loading.
+class GlyphStore {
+public:
+    GlyphStore(const std::string &glyphURL);
+
+    // Block until all specified GlyphRanges of the specified font stack are loaded.
+    void waitForGlyphRanges(const std::string &fontStack, const std::set<GlyphRange> &glyphRanges);
+
+    FontStack &getFontStack(const std::string &fontStack);
+
+private:
+    // Loads an individual glyph range from the font stack and adds it to rangeSets
+    std::shared_future<GlyphPBF &> loadGlyphRange(const std::string &fontStack, std::map<GlyphRange, std::unique_ptr<GlyphPBF>> &rangeSets, GlyphRange range);
+
+    FontStack &createFontStack(const std::string &fontStack);
+
+public:
+    const std::string glyphURL;
+
+private:
+    std::unordered_map<std::string, std::map<GlyphRange, std::unique_ptr<GlyphPBF>>> ranges;
+    std::unordered_map<std::string, std::unique_ptr<FontStack>> stacks;
+    std::mutex mtx;
+};
+
+
+}
+
+#endif