Method deliverScaledImage

YACReader/continuous_page_widget.cpp:349–383

}

void ContinuousPageWidget::deliverScaledImage(int pageIndex, quint64 generation, QImage scaledImage,
                                              qint64 sourceCacheKey, QSize sourceSize, QSize targetSize,
                                              QSize targetPixelSize, qreal devicePixelRatio)
{
    ScaleRequestKey deliveredKey;
    deliveredKey.sourceCacheKey = sourceCacheKey;
    deliveredKey.targetPixelSize = targetPixelSize;
    deliveredKey.devicePixelRatio = devicePixelRatio;
    deliveredKey.generation = generation;

    // Only consume this result if it still matches the page's pending request.
    // A stale task (older source / superseded request) is dropped without
    // clearing the newer pending marker.
    auto it = pendingScaleRequests.find(pageIndex);
    if (it == pendingScaleRequests.end() || !(it.value() == deliveredKey)) {
        return;
    }

    pendingScaleRequests.erase(it);

    if (generation != cacheGeneration || scaledImage.isNull()) {
        return;
    }

    ScaledPageCacheEntry entry;
    entry.sourceCacheKey = sourceCacheKey;
    entry.sourceSize = sourceSize;
    entry.targetSize = targetSize;
    entry.targetPixelSize = targetPixelSize;
    entry.targetDevicePixelRatio = devicePixelRatio;
    entry.scaledImage = std::move(scaledImage);
    scaledPageCache.pages.insert(pageIndex, std::move(entry));

    update(pageRectFor(pageIndex));
}

void ContinuousPageWidget::resetScaledCache()
{