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#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
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