mgl_font_storage.h

[詳解]

// SPDX-License-Identifier: Zlib
/* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
 
#ifndef INCGUARD_MGL_FONT_STORAGE_H_1622009046
#define INCGUARD_MGL_FONT_STORAGE_H_1622009046
 
#include <mutex>
 
#include <mgl/common/mgl_singleton.h>
#include <mgl/hash/mgl_hash_fnv1a.h>
#include <mgl/render/font/mgl_font_resource.h>
#include <mgl/stl/mgl_stl_containers.h>
 
namespace MGL::Render
{
enum class FontKey : uint32_t {};
 
using FontResourceMap = STL::unordered_map<FontKey, SharedFontResource>;
 
constexpr uint32_t kDefaultFontKeySeed = MGL::Hash::kFNV1aDefaultValue32;    // 32bitの値なら何でもいい．衝突する場合は変更を
 
/* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
constexpr FontKey MakeFontKey(const char *key, uint32_t seed = kDefaultFontKeySeed) noexcept
{
    return FontKey{MGL::Hash::FNV1a(key, seed)};
}
 
class FontStorage : public MGL::SharedSingleton<FontStorage>
{
public:
    static STL::unique_ptr<FontStorage> &GetInstanceRef() noexcept;
 
    FontStorage() noexcept = default;
 
    bool Add(FontKey key, const SharedFontResource &resource) noexcept;
    SharedFontResource Get(FontKey key) noexcept;
    bool Remove(FontKey key) noexcept;
 
private:
    FontResourceMap _resources;
    std::mutex _mutex;
};
}    // namespace MGL::Render
 
#endif    // INCGUARD_MGL_FONT_STORAGE_H_1622009046
 
// vim: et ts=4 sw=4 sts=4