Function TTFSurfaceCacheGetOrAdd

src/openrct2/drawing/TTF.cpp:205–258

}

TTFSurface* TTFSurfaceCacheGetOrAdd(TTF_Font* font, std::string_view text)
{
    ttf_cache_entry* entry;

    uint32_t hash = TTFSurfaceCacheHash(font, text);
    int32_t index = hash % kTTFSurfaceCacheSize;

    DrawingUniqueLock<std::mutex> lock(_mutex);

    for (int32_t i = 0; i < kTTFSurfaceCacheSize; i++)
    {
        entry = &_ttfSurfaceCache[index];

        // Check if entry is a hit
        if (entry->surface == nullptr)
            break;
        if (entry->font == font && String::equals(entry->text, text))
        {
            _ttfSurfaceCacheHitCount++;
            entry->lastUseTick = gCurrentDrawCount;
            return entry->surface;
        }

        // If entry hasn't been used for a while, replace it
        if (entry->lastUseTick < gCurrentDrawCount - 64)
        {
            break;
        }

        // Check if next entry is a hit
        if (++index >= kTTFSurfaceCacheSize)
            index = 0;
    }

    // Cache miss, replace entry with new surface
    entry = &_ttfSurfaceCache[index];
    TTFSurfaceCacheDispose(entry);

    TTFSurface* surface = TTFRender(font, text);
    if (surface == nullptr)
    {
        return nullptr;
    }

    _ttfSurfaceCacheMissCount++;
    // printf("CACHE HITS: %d   MISSES: %d)\n", _ttfSurfaceCacheHitCount, _ttfSurfaceCacheMissCount);

    _ttfSurfaceCacheCount++;
    entry->surface = surface;
    entry->font = font;
    entry->text = text;
    entry->lastUseTick = gCurrentDrawCount;
    return entry->surface;
}

static void TTFGetWidthCacheDispose(ttf_getwidth_cache_entry* entry)
{