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#pragma once
#include <mbgl/text/glyph.hpp>
#include <mbgl/text/glyph_atlas_observer.hpp>
#include <mbgl/text/glyph_range.hpp>
#include <mbgl/geometry/binpack.hpp>
#include <mbgl/util/noncopyable.hpp>
#include <mbgl/util/optional.hpp>
#include <mbgl/util/font_stack.hpp>
#include <mbgl/util/work_queue.hpp>
#include <mbgl/util/image.hpp>
#include <mbgl/gl/texture.hpp>
#include <mbgl/gl/object.hpp>
#include <string>
#include <unordered_set>
#include <unordered_map>
class GlyphAtlasTest;
namespace mbgl {
class FileSource;
class AsyncRequest;
class Response;
namespace gl {
class Context;
} // namespace gl
class GlyphRequestor {
public:
virtual ~GlyphRequestor() = default;
virtual void onGlyphsAvailable(GlyphPositionMap) = 0;
};
class GlyphAtlas : public util::noncopyable {
public:
GlyphAtlas(Size, FileSource&);
~GlyphAtlas();
// Workers send a `getGlyphs` message to the main thread once they have determined
// which glyphs they will need. Invoking this method will increment reference
// counts for all the glyphs in `GlyphDependencies`. If all glyphs are already
// locally available, the observer will be notified that the glyphs are available
// immediately. Otherwise, a request on the FileSource is made, and when all glyphs
// are parsed and added to the atlas, the observer will be notified.
// Workers are given a copied 'GlyphPositions' map to use for placing their glyphs.
// The positions specified in this object are guaranteed to be
// valid for the lifetime of the tile.
void getGlyphs(GlyphRequestor&, GlyphDependencies);
void removeGlyphs(GlyphRequestor&);
void setURL(const std::string& url) {
glyphURL = url;
}
void setObserver(GlyphAtlasObserver*);
// Binds the atlas texture to the GPU, and uploads data if it is out of date.
void bind(gl::Context&, gl::TextureUnit unit);
// Uploads the texture to the GPU to be available when we need it. This is a lazy operation;
// the texture is only bound when the data is out of date (=dirty).
void upload(gl::Context&, gl::TextureUnit unit);
Size getSize() const;
private:
FileSource& fileSource;
std::string glyphURL;
struct GlyphValue {
AlphaImage bitmap;
GlyphMetrics metrics;
optional<Rect<uint16_t>> rect;
std::unordered_set<GlyphRequestor*> ids;
};
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, GlyphValue> glyphs;
};
std::unordered_map<FontStack, Entry, FontStackHash> entries;
GlyphRequest& requestRange(Entry&, const FontStack&, const GlyphRange&);
void processResponse(const Response&, const FontStack&, const GlyphRange&);
void addGlyphs(GlyphRequestor&, const GlyphDependencies&);
Rect<uint16_t> addGlyph(GlyphValue&);
void removeGlyphValues(GlyphRequestor&, std::map<GlyphID, GlyphValue>&);
void removePendingRanges(GlyphRequestor&, std::map<GlyphRange, GlyphRequest>&);
GlyphAtlasObserver* observer = nullptr;
BinPack<uint16_t> bin;
AlphaImage image;
bool dirty;
mbgl::optional<gl::Texture> texture;
};
} // namespace mbgl
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