1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
#pragma once
#include <mbgl/text/glyph.hpp>
#include <mbgl/text/glyph_atlas_observer.hpp>
#include <mbgl/text/glyph_range.hpp>
#include <mbgl/text/glyph_pbf.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 void onGlyphsAvailable(GlyphPositionMap, GlyphRangeSet) = 0;
};
class GlyphAtlas : public util::noncopyable {
public:
GlyphAtlas(Size, FileSource&);
~GlyphAtlas();
std::map<uint32_t, SDFGlyph>& 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&, 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// Binds the atlas texture to the GPU, and uploads data if it is out of date.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// the texture is only bound when the data is out of date (=dirty).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 {
GlyphValue(Rect<uint16_t> rect_, GlyphRequestor* id)
: rect(std::move(rect_)), ids({ id }) {}
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<uint32_t, SDFGlyph> sdfs;
std::map<uint32_t, GlyphValue> glyphValues;
};
std::unordered_map<FontStack, Entry, FontStackHash> entries;
// Only used by GlyphAtlasTest
friend class ::GlyphAtlasTest;
bool hasGlyphRanges(const FontStack&, const GlyphRangeSet&) const;
bool hasGlyphRange(const FontStack&, const GlyphRange&) const;
bool rangeIsParsed(const std::map<GlyphRange, GlyphRequest>&, const GlyphRange&) const;
GlyphRequest& requestRange(Entry&, const FontStack&, const GlyphRange&);
void processResponse(const Response&, const FontStack&, const GlyphRange&);
void addGlyphs(GlyphRequestor&, const GlyphDependencies&);
void addGlyph(GlyphRequestor&, const FontStack&, const SDFGlyph&);
void removeGlyphValues(GlyphRequestor&, std::map<uint32_t, 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
|
