Method nonEmptyRegion

source/game/StarImageMetadataDatabase.cpp:99–125

}

RectU ImageMetadataDatabase::nonEmptyRegion(AssetPath const& path) const {
  MutexLocker locker(m_mutex);
  
  if (auto cached = m_regionCache.ptr(path)) {
    return *cached;
  }

  auto filteredPath = filterProcessing(path);
  if (auto cached = m_regionCache.ptr(filteredPath)) {
    m_regionCache.set(path, *cached);
    return *cached;
  }

  locker.unlock();
  auto image = Root::singleton().assets()->image(filteredPath);
  RectU region = RectU::null();
  image->forEachPixel([&region](unsigned x, unsigned y, Vec4B const& pixel) {
    if (pixel[3] > 0)
      region.combine(RectU::withSize({x, y}, {1, 1}));
  });

  locker.lock();
  m_regionCache.set(path, region);
  m_regionCache.set(filteredPath, region);

  return region;
}

void ImageMetadataDatabase::cleanup() const {
  MutexLocker locker(m_mutex);