Method getResizedImage

valdi/src/valdi/snap_drawing/ImageLoading/ImageCache.cpp:101–137

}

CachedImage ImageCache::getResizedImage(const String& url,
                                        Ref<ImageCacheItem>& cachedItem,
                                        int preferredWidth,
                                        int preferredHeight) {
    Ref<Image> returnImage;
    auto scalingResult =
        findScaledDimensions(cachedItem->getWidth(), cachedItem->getHeight(), preferredWidth, preferredHeight);
    auto newWidth = scalingResult.width;
    auto newHeight = scalingResult.height;
    auto scalingFactor = scalingResult.scaling;

    if ((cachedItem->getWidth() != newWidth || cachedItem->getHeight() != newHeight)) {
        // NOTE(rjaber): This generates a new key, which may not be a valid URL.
        //              case1 (valid)  : https://placecats.com/200/300?foo=bar&com.valdi.dimension=100,150
        //              case2 (invalid): https://placecats.com/200/300&com.valdi.dimension=100,150
        auto new_url = url.append(STRING_FORMAT("&com.valdi.dimensions={},{};", newWidth, newHeight));

        auto it = _cache.find(new_url);
        if (it == _cache.end()) {
            auto resizedCachedItem = cachedItem->getResized(new_url, newWidth, newHeight);
            _cacheListStart->insertAfter(resizedCachedItem);
            returnImage = resizedCachedItem->updateLastAccessAndGetImage();
            _cache[new_url] = resizedCachedItem;
            _currentSize += resizedCachedItem->getImageSizeInBytes();
        } else {
            returnImage = retrieveImage(it->second);
        }
    } else {
        returnImage = retrieveImage(cachedItem);
    }

    if (_currentSize > _maxSizeInBytes) {
        invalidateCachedItems(EvictionPolicy::Memory);
    }

    return CachedImage(returnImage, scalingFactor);
}

void ImageCache::setMaxAge(uint64_t maxAgeSeconds) {
    _maxAgeMicroSeconds = snap::utils::time::Duration<std::chrono::steady_clock>(std::chrono::seconds(maxAgeSeconds));