C++ DImg::smoothScale方法代码示例

void ImageQualityTask::run()
{
    if (!d->cancel)
    {
        // Get item preview to perform quality analysis. No need to load whole image, this will be slower.
        // TODO : check if 1024 pixels size is enough to get suitable Quality results.
        DImg dimg = PreviewLoadThread::loadFastSynchronously(d->path, 1024);

        if (!dimg.isNull() && !d->cancel)
        {
            // TODO : run here Quality analysis backend and store Pick Label result to DB.
            // Backend Input : d->quality as Quality analysis settings,
            //                 dimg       as reduced size image data to parse,
            //                 d->path    as file path to patch DB properties.
            // Result        : Backend must scan Quality of image depending of settings and compute a Quality estimation accordingly.
            //                 Finaly, using file path, DB Pick Label properties must be assigned through ImageInfo interface.
            // Warning       : All code here will run in a separated thread and must be re-entrant/thread-safe. Only pure computation
            //                 must be processed. GUI calls are prohibited. ImageInfo and DImg can be used safety in thread.

            PickLabel pick;
            d->imgqsort = new ImgQSort(dimg, d->quality, &pick);
            d->imgqsort->startAnalyse();

            ImageInfo info = ImageInfo::fromLocalFile(d->path);
            info.setPickLabel(pick);

            delete d->imgqsort; //delete image data after setting label
            d->imgqsort = 0;
        }
        // Dispatch progress to Progress Manager
        QImage qimg = dimg.smoothScale(22, 22, Qt::KeepAspectRatio).copyQImage();
        emit signalFinished(qimg);
        emit signalDone();
    }
}

uchar* ImageIface::Private::previewImageData()
{
    if (previewImage.isNull())
    {
        DImg* im = 0;

        if (previewType == FullImage)
        {
            im = core->getImg();

            if (!im || im->isNull())
            {
                return 0;
            }
        }
        else  // ImageSelection
        {
            im = new DImg(core->getImgSelection());

            if (!im)
            {
                return 0;
            }

            if (im->isNull())
            {
                delete im;
                return 0;
            }

            im->setIccProfile(core->getEmbeddedICC());
        }

        QSize sz(im->width(), im->height());
        sz.scale(constrainWidth, constrainHeight, Qt::KeepAspectRatio);

        previewImage       = im->smoothScale(sz.width(), sz.height());
        previewWidth       = previewImage.width();
        previewHeight      = previewImage.height();

        // only create another copy if needed, in setPreviewImage
        targetPreviewImage = previewImage;

        if (previewType == ImageSelection)
        {
            delete im;
        }
    }

    DImg previewData = previewImage.copyImageData();
    return previewData.stripImageData();
}

bool WaterMark::toolOperations()
{

    if (!loadToDImg())
    {
        return false;
    }

    QString fileName        = settings()[QLatin1String("Watermark image")].toString();
    int placement           = settings()[QLatin1String("Placement")].toInt();
    int size                = settings()[QLatin1String("Watermark size")].toInt();
    int xMargin             = settings()[QLatin1String("X margin")].toInt();
    int yMargin             = settings()[QLatin1String("Y margin")].toInt();
    bool useImage           = settings()[QLatin1String("Use image")].toBool();

    QString text            = settings()[QLatin1String("Text")].toString();
    QFont font              = settings()[QLatin1String("Font")].toString();
    QColor fontColor        = settings()[QLatin1String("Color")].toString();
    int textOpacity         = settings()[QLatin1String("Text opacity")].toInt();
    bool useBackground      = settings()[QLatin1String("Use background")].toBool();
    QColor backgroundColor  = settings()[QLatin1String("Background color")].toString();
    int backgroundOpacity   = settings()[QLatin1String("Background opacity")].toInt();


    DImg watermarkImage;
    DColorComposer* composer = DColorComposer::getComposer(DColorComposer::PorterDuffNone);
    int marginW              = lround(image().width()  * (xMargin / 100.0));
    int marginH              = lround(image().height() * (yMargin / 100.0));

    if (useImage)
    {
        watermarkImage = DImg(fileName);

        if (watermarkImage.isNull())
        {
            return false;
        }

        DImg tempImage = watermarkImage.smoothScale(image().width() * size / 100, image().height() * size / 100, Qt::KeepAspectRatio);
        watermarkImage = tempImage;
    }
    else
    {
        int alignMode;
        const int radius = 10;

        if (text.isEmpty())
        {
            return false;
        }

        int fontSize = queryFontSize(text, font, size);

        if (fontSize == 0)
        {
            return false;
        }

        switch (placement)
        {
            case Private::TopLeft:
                alignMode = Qt::AlignLeft;
                break;

            case Private::TopRight:
                alignMode = Qt::AlignRight;
                break;

            case Private::BottomLeft:
                alignMode = Qt::AlignLeft;
                break;

            case Private::Center:
                alignMode = Qt::AlignCenter;
                break;

            default :    // BottomRight
                alignMode = Qt::AlignRight;
                break;
        }

        font.setPointSizeF(fontSize);
        QFontMetrics fontMt(font);
        QRect fontRect = fontMt.boundingRect(radius, radius, image().width(), image().height(), 0, text);

        // Add a transparent layer.
        QRect backgroundRect(fontRect.x() - radius, fontRect.y() - radius,
                             fontRect.width() + 2 * radius, fontRect.height() + 2 * radius);
        DImg backgroundLayer(backgroundRect.width(), backgroundRect.height(), image().sixteenBit(), true);
        DColor transparent(QColor(0, 0, 0));
        transparent.setAlpha(0);

        if (image().sixteenBit())
        {
            transparent.convertToSixteenBit();
        }

        backgroundLayer.fill(transparent);

        DImg grayTransLayer(fontRect.width(), fontRect.height(), image().sixteenBit(), true);
//.........这里部分代码省略.........