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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/text/glyph_set.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 GlyphPBF;
namespace gl {
class Context;
} // namespace gl
class GlyphRequestor {
public:
virtual void onGlyphsAvailable(GlyphPositionMap, GlyphRangeSet) = 0;
};
class GlyphAtlas : public util::noncopyable, public GlyphAtlasObserver {
public:
GlyphAtlas(Size, FileSource&);
~GlyphAtlas();
GlyphSet& getGlyphSet(const FontStack&);
// 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& requestor, GlyphDependencies glyphs);
void setURL(const std::string &url) {
glyphURL = url;
}
std::string getURL() const {
return glyphURL;
}
void setObserver(GlyphAtlasObserver* observer);
void removeGlyphs(GlyphRequestor&);
// Binds the atlas texture to the GPU, and uploads data if it is out of date.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// the texture is only bound when the data is out of date (=dirty).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;
virtual void onGlyphsLoaded(const FontStack&, const GlyphRange&);
virtual void onGlyphsError(const FontStack&, const GlyphRange&, std::exception_ptr);
friend class ::GlyphAtlasTest;
private:
void addGlyphs(GlyphRequestor& requestor, const GlyphDependencies& glyphDependencies);
// Only used by GlyphAtlasTest
bool hasGlyphRanges(const FontStack&, const GlyphRangeSet& ranges) const;
bool hasGlyphRange(const FontStack&, const GlyphRange& range) const;
void addGlyph(GlyphRequestor& requestor, const FontStack&, const SDFGlyph&);
FileSource& fileSource;
std::string glyphURL;
struct GlyphValue {
GlyphValue(Rect<uint16_t> rect_, GlyphRequestor* id)
: rect(std::move(rect_)), ids({ id }) {}
Rect<uint16_t> rect;
std::unordered_set<GlyphRequestor*> ids;
};
struct Entry {
std::map<GlyphRange, GlyphPBF> ranges;
GlyphSet glyphSet;
std::map<uint32_t, GlyphValue> glyphValues;
};
std::unordered_map<FontStack, Entry, FontStackHash> entries;
void removeGlyphValues(GlyphRequestor& requestor, std::map<uint32_t, GlyphValue>& face);
void removePendingRanges(GlyphRequestor& requestor, std::map<GlyphRange, GlyphPBF>& ranges);
GlyphAtlasObserver* observer = nullptr;
BinPack<uint16_t> bin;
AlphaImage image;
bool dirty;
mbgl::optional<gl::Texture> texture;
};
} // namespace mbgl
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