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
|
#ifndef MBGL_SPRITE_ATLAS
#define MBGL_SPRITE_ATLAS
#include <mbgl/geometry/binpack.hpp>
#include <mbgl/platform/gl.hpp>
#include <mbgl/util/noncopyable.hpp>
#include <mbgl/util/ptr.hpp>
#include <mbgl/util/optional.hpp>
#include <string>
#include <map>
#include <mutex>
#include <atomic>
#include <set>
#include <array>
namespace mbgl {
class SpriteStore;
class SpriteImage;
class SpritePosition;
struct SpriteAtlasPosition {
inline SpriteAtlasPosition(const std::array<float, 2> size_ = {{0, 0}},
const std::array<float, 2> tl_ = {{0, 0}},
const std::array<float, 2> br_ = {{0, 0}})
: size(size_), tl(tl_), br(br_) {}
std::array<float, 2> size;
std::array<float, 2> tl;
std::array<float, 2> br;
};
struct SpriteAtlasElement {
Rect<uint16_t> pos;
std::shared_ptr<const SpriteImage> spriteImage;
float relativePixelRatio;
};
class SpriteAtlas : public util::noncopyable {
public:
typedef uint16_t dimension;
SpriteAtlas(dimension width, dimension height, float pixelRatio, SpriteStore& store);
~SpriteAtlas();
// If the sprite is loaded, copies the requsted image from it into the atlas and returns
// the resulting icon measurements. If not, returns an empty optional.
optional<SpriteAtlasElement> getImage(const std::string& name, const bool wrap);
// This function is used for getting the position during render time.
optional<SpriteAtlasPosition> getPosition(const std::string& name, bool repeating = false);
// Binds the atlas texture to the GPU, and uploads data if it is out of date.
void bind(bool linear = false);
// Updates sprites in the atlas texture that may have changed in the source SpriteStore object.
void updateDirty();
// 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// the texture is only bound when the data is out of date (=dirty).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();
inline dimension getWidth() const { return width; }
inline dimension getHeight() const { return height; }
inline dimension getTextureWidth() const { return pixelWidth; }
inline dimension getTextureHeight() const { return pixelHeight; }
inline float getPixelRatio() const { return pixelRatio; }
// Only for use in tests.
inline const uint32_t* getData() const { return data.get(); }
private:
const GLsizei width, height;
const dimension pixelWidth, pixelHeight;
const float pixelRatio;
struct Holder : private util::noncopyable {
inline Holder(const std::shared_ptr<const SpriteImage>&, const Rect<dimension>&);
inline Holder(Holder&&);
std::shared_ptr<const SpriteImage> spriteImage;
const Rect<dimension> pos;
};
using Key = std::pair<std::string, bool>;
Rect<SpriteAtlas::dimension> allocateImage(const SpriteImage&);
void copy(const Holder& holder, const bool wrap);
std::recursive_mutex mtx;
SpriteStore& store;
BinPack<dimension> bin;
std::map<Key, Holder> images;
std::set<std::string> uninitialized;
std::unique_ptr<uint32_t[]> data;
std::atomic<bool> dirty;
bool fullUploadRequired = true;
GLuint texture = 0;
uint32_t filter = 0;
static const int buffer = 1;
};
} // namespace mbgl
#endif
|
