Function loadFCStdThumbnail

src/Mod/Start/App/FcstdInfoSource.cpp:44–84

Load the thumbnail image data (if any) that is stored in an FCStd file. \returns The image bytes, or an empty QByteArray (if no thumbnail was stored)

/// Load the thumbnail image data (if any) that is stored in an FCStd file.
/// \returns The image bytes, or an empty QByteArray (if no thumbnail was stored)
static QByteArray loadFCStdThumbnail(const App::ProjectFile& proj, const QString& filePath)
{
    try {
        const QString pathToCachedThumbnail = getPathToCachedThumbnail(filePath);
        if (useCachedThumbnail(pathToCachedThumbnail, filePath)) {
            if (auto inputFile = QFile(pathToCachedThumbnail);
                inputFile.exists() && inputFile.open(QIODevice::OpenModeFlag::ReadOnly)) {
                return inputFile.readAll();
            }
        }
        else {
            const auto pathToThumbnail = QString(defaultThumbnailPath).toStdString();
            if (proj.containsFile(pathToThumbnail)) {
                createThumbnailsDir();

                // Read the thumbnail into a buffer
                const auto dataSize = proj.sizeOfFile(pathToThumbnail);
                QByteArray data(dataSize, Qt::Uninitialized);
#ifdef __cpp_lib_spanstream
                std::spanstream dataStream({data.data(), size_t(data.size())});
#else
                Base::BufferStreambuf dataStreambuf({data.data(), size_t(data.size())});
                std::ostream dataStream(&dataStreambuf);
#endif
                proj.readInputFileDirect(pathToThumbnail, dataStream);

                // Save that buffer to the thumbnail cache
                const Base::FileInfo thumbnailFileInfo(pathToCachedThumbnail.toStdString());
                Base::ofstream thumbnailFileStream(thumbnailFileInfo, std::ios::out | std::ios::binary);
                thumbnailFileStream.write(data.data(), data.size());
                thumbnailFileStream.close();

                return data;
            }
        }
    }
    catch (...) {
        Base::Console().log("Failed to load thumbnail for %s", filePath.toStdString());
    }
    return {};
}

static FileStats getProjectFileInfo(const App::ProjectFile& proj)
{