Method Open

src/QtImageReader.cpp:45–130

Open image file

// Open image file
void QtImageReader::Open()
{
    // Open reader if not already open
    if (!is_open)
    {
        bool loaded = false;
        QSize default_svg_size;

        // Check for SVG files and rasterizing them to QImages
        if (path.toLower().endsWith(".svg") || path.toLower().endsWith(".svgz")) {
            #if RESVG_VERSION_MIN(0, 11)
                // Initialize the Resvg options
                resvg_options.loadSystemFonts();
            #endif
            
            // Parse SVG file
            default_svg_size = load_svg_path(path);
            if (!default_svg_size.isEmpty()) {
                loaded = true;
            }
        }

        if (!loaded) {
            // Attempt to open file using Qt's build in image processing capabilities
            // AutoTransform enables exif data to be parsed and auto transform the image
            // to the correct orientation
            image = std::make_shared<QImage>();
            QImageReader imgReader( path );
            imgReader.setAutoTransform( true );
            imgReader.setDecideFormatFromContent( true );
            loaded = imgReader.read(image.get());
        }

        if (!loaded) {
            // raise exception
            throw InvalidFile("QtImageReader could not open image file.", path.toStdString());
        }

        // Update image properties
        info.has_audio = false;
        info.has_video = true;
        info.has_single_image = true;
        #if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
            // byteCount() is deprecated from Qt 5.10
            info.file_size = image->sizeInBytes();
        #else
            info.file_size = image->byteCount();
        #endif
        info.vcodec = "QImage";
        if (!default_svg_size.isEmpty()) {
            // Use default SVG size (if detected)
            info.width = default_svg_size.width();
            info.height = default_svg_size.height();
        } else {
            // Use Qt Image size as a fallback
            info.width = image->width();
            info.height = image->height();
        }