[core] Reorganize sprite related files

1 files changed, 103 insertions, 0 deletions

diff --git a/src/mbgl/sprite/sprite_atlas.hpp b/src/mbgl/sprite/sprite_atlas.hpp
new file mode 100644
index 0000000000..0d86279e2d
--- /dev/null
+++ b/src/mbgl/sprite/sprite_atlas.hpp
@@ -0,0 +1,103 @@
+#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 <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 {
+    const Rect<uint16_t> pos;
+    const std::shared_ptr<const SpriteImage> texture;
+};
+
+class SpriteAtlas : public util::noncopyable {
+public:
+    typedef uint16_t dimension;
+
+    SpriteAtlas(dimension width, dimension height, float pixelRatio, SpriteStore& store);
+    ~SpriteAtlas();
+
+    // Returns the coordinates of an image that is sourced from the sprite image.
+    // This getter attempts to read the image from the sprite if it is already loaded.
+    // In that case, it copies it into the sprite atlas and returns the dimensions.
+    // Otherwise, it returns a 0/0/0/0 rect.
+    // This function is used during bucket creation.
+    SpriteAtlasElement getImage(const std::string& name, const bool wrap);
+
+    // This function is used for getting the position during render time.
+    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+    // Binds the atlas texture to the GPU, and uploads data if it is out of date.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+    // the texture is only bound when the data is out of date (=dirty).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; }
+    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> texture;
+        const Rect<dimension> pos;
+    };
+
+    using Key = std::pair<std::string, bool>;
+
+    Rect<SpriteAtlas::dimension> allocateImage(size_t width, size_t height);
+    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;
+    const 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;
+};
+
+};
+
+#endif