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#ifndef MBGL_TEXT_GLYPH_STORE
#define MBGL_TEXT_GLYPH_STORE
#include <mbgl/text/glyph.hpp>
#include <mbgl/util/vec.hpp>
#include <mbgl/util/ptr.hpp>
#include <mbgl/util/exclusive.hpp>
#include <cstdint>
#include <vector>
#include <future>
#include <map>
#include <set>
#include <string>
#include <unordered_map>
typedef struct uv_loop_s uv_loop_t;
namespace uv {
class async;
}
namespace mbgl {
class FileSource;
class Environment;
class Request;
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, float maxWidth, float lineHeight,
float horizontalAlign, float verticalAlign, float justify,
float spacing, const vec2<float> &translate) const;
void lineWrap(Shaping &shaping, float lineHeight, float maxWidth, float horizontalAlign,
float verticalAlign, float justify) const;
private:
std::map<uint32_t, std::string> bitmaps;
std::map<uint32_t, GlyphMetrics> metrics;
std::map<uint32_t, SDFGlyph> sdfs;
};
class GlyphPBF {
public:
using GlyphLoadedCallback = std::function<void(GlyphPBF*)>;
using GlyphLoadingFailedCallback = std::function<void(const std::string&)>;
GlyphPBF(const std::string &glyphURL,
const std::string &fontStack,
GlyphRange glyphRange,
Environment &env,
const GlyphLoadedCallback& successCallback,
const GlyphLoadingFailedCallback& failureCallback);
~GlyphPBF();
void parse(FontStack &stack);
bool isParsed() const;
private:
GlyphPBF(const GlyphPBF &) = delete;
GlyphPBF(GlyphPBF &&) = delete;
GlyphPBF &operator=(const GlyphPBF &) = delete;
GlyphPBF &operator=(GlyphPBF &&) = delete;
std::string data;
std::atomic_bool parsed;
Environment& env;
Request* req = nullptr;
};
// Manages Glyphrange PBF loading.
class GlyphStore {
public:
class Observer {
public:
virtual ~Observer() = default;
virtual void onGlyphRangeLoaded() = 0;
virtual void onGlyphRangeLoadingFailed(std::exception_ptr error) = 0;
};
GlyphStore(uv_loop_t* loop, Environment &);
~GlyphStore();
// Asynchronously request for GlyphRanges and when it gets loaded, notifies the
// observer subscribed to this object. Successive requests for the same range are
// going to be discarded. Returns true if a request was made or false if all the
// GlyphRanges are already available, and thus, no request is performed.
bool requestGlyphRangesIfNeeded(const std::string &fontStack, const std::set<GlyphRange> &glyphRanges);
util::exclusive<FontStack> getFontStack(const std::string &fontStack);
void setURL(const std::string &url);
void setObserver(Observer* observer);
private:
void emitGlyphRangeLoaded();
void emitGlyphRangeLoadingFailed();
util::exclusive<FontStack> createFontStack(const std::string &fontStack);
std::string glyphURL;
Environment &env;
std::unordered_map<std::string, std::map<GlyphRange, std::unique_ptr<GlyphPBF>>> ranges;
std::mutex rangesMutex;
std::unordered_map<std::string, std::unique_ptr<FontStack>> stacks;
std::mutex stacksMutex;
std::string errorMessage;
std::mutex errorMessageMutex;
std::unique_ptr<uv::async> asyncEmitGlyphRangeLoaded;
std::unique_ptr<uv::async> asyncEmitGlyphRangeLoadedingFailed;
Observer* observer;
};
}
#endif
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