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
|
#pragma once
#include <mbgl/text/glyph_range.hpp>
#include <mbgl/util/bitmask_operations.hpp>
#include <mbgl/util/font_stack.hpp>
#include <mbgl/util/rect.hpp>
#include <mbgl/util/traits.hpp>
#include <mbgl/util/optional.hpp>
#include <mbgl/util/immutable.hpp>
#include <mbgl/util/image.hpp>
#include <mbgl/util/util.hpp>
#include <cstdint>
#include <vector>
#include <string>
#include <map>
#include <set>
namespace mbgl {
using GlyphID = char16_t;
using GlyphIDs = std::set<GlyphID>;
// Note: this only works for the BMP
GlyphRange getGlyphRange(GlyphID glyph);
struct GlyphMetrics {
uint32_t width = 0;
uint32_t height = 0;
int32_t left = 0;
int32_t top = 0;
uint32_t advance = 0;
};
inline bool operator==(const GlyphMetrics& lhs, const GlyphMetrics& rhs) {
return lhs.width == rhs.width &&
lhs.height == rhs.height &&
lhs.left == rhs.left &&
lhs.top == rhs.top &&
lhs.advance == rhs.advance;
}
class Glyph {
public:
// We're using this value throughout the Mapbox GL ecosystem. If this is different, the glyphs
// also need to be reencoded.
static constexpr const uint8_t borderSize = 3;
GlyphID id = 0;
// A signed distance field of the glyph with a border (see above).
AlphaImage bitmap;
// Glyph metrics
GlyphMetrics metrics;
};
using Glyphs = std::map<GlyphID, optional<Immutable<Glyph>>>;
using GlyphMap = std::map<FontStackHash, Glyphs>;
class PositionedGlyph {
public:
explicit PositionedGlyph(GlyphID glyph_, float x_, float y_, bool vertical_, FontStackHash font_, float scale_, std::size_t sectionIndex_ = 0)
: glyph(glyph_), x(x_), y(y_), vertical(vertical_), font(font_), scale(scale_), sectionIndex(sectionIndex_)
{}
GlyphID glyph = 0;
float x = 0;
float y = 0;
bool vertical = false;
FontStackHash font = 0;
float scale = 0.0;
// Maps positioned glyph to TaggedString section
std::size_t sectionIndex;
};
enum class WritingModeType : uint8_t;
class Shaping {
public:
Shaping() = default;
explicit Shaping(float x, float y, WritingModeType writingMode_, std::size_t lineCount_)
: top(y), bottom(y), left(x), right(x), writingMode(writingMode_), lineCount(lineCount_) {}
std::vector<PositionedGlyph> positionedGlyphs;
float top = 0;
float bottom = 0;
float left = 0;
float right = 0;
WritingModeType writingMode;
std::size_t lineCount = 0u;
explicit operator bool() const { return !positionedGlyphs.empty(); }
// The y offset *should* be part of the font metadata.
static constexpr int32_t yOffset = -17;
};
enum class WritingModeType : uint8_t {
None = 0,
Horizontal = 1 << 0,
Vertical = 1 << 1,
};
using GlyphDependencies = std::map<FontStack, GlyphIDs>;
using GlyphRangeDependencies = std::map<FontStack, std::unordered_set<GlyphRange>>;
} // end namespace mbgl
|
