Method requestRange

YACReader/continuous_page_provider.cpp:156–190

}

void ContinuousPageProvider::requestRange(int firstPage, int lastPage)
{
    if (!render || numPagesValue <= 0) {
        return;
    }

    firstPage = qBound(0, firstPage, numPagesValue - 1);
    lastPage = qBound(0, lastPage, numPagesValue - 1);
    if (lastPage < firstPage) {
        return;
    }

    requestedFirst = firstPage;
    requestedLast = lastPage;

    const int keepMin = std::max(0, firstPage - kEvictMargin);
    const int keepMax = std::min(numPagesValue - 1, lastPage + kEvictMargin);

    // Evict cached pages outside the kept window.
    for (auto it = cache.begin(); it != cache.end();) {
        if (it.key() < keepMin || it.key() > keepMax) {
            it = cache.erase(it);
        } else {
            ++it;
        }
    }

    // Schedule decode for requested pages whose raw bytes are loaded and that
    // are not already decoded or in flight.
    for (int i = firstPage; i <= lastPage; ++i) {
        if (rawDataReady.contains(i) && !cache.contains(i) && !pending.contains(i)) {
            scheduleDecode(i);
        }
    }
}

const QImage *ContinuousPageProvider::image(int pageIndex) const
{