C++ DImg::isNull方法代码示例

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();
}

void DImgPreviewItem::slotGotImagePreview(const LoadingDescription& description, const DImg& image)
{
    Q_D(DImgPreviewItem);

    if (description.filePath != d->path || description.isThumbnail())
    {
        return;
    }

    setImage(image);

    if (image.isNull())
    {
        d->state = ImageLoadingFailed;
        emit stateChanged(d->state);
        emit loadingFailed();
    }
    else
    {
        d->state = ImageLoaded;
        emit stateChanged(d->state);
        emit loaded();
    }

    preloadNext();
}

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();
    }
}

void UndoManager::restoreSnapshot(int index, const UndoMetadataContainer& c)
{
    DImg img = d->undoCache->getData(index);

    if (!img.isNull())
    {
        d->core->setUndoImg(c, img);
    }
}

void BCGFilter::applyBCG(DImg& image)
{
    if (image.isNull())
    {
        return;
    }

    applyBCG(image.bits(), image.width(), image.height(), image.sixteenBit());
}

void ImageIface::setOriginal(const QString& caller, const FilterAction& action, const DImg& img)
{
    if (img.isNull())
    {
        kDebug() << "No image data to handle";
        return;
    }

    d->core->putImg(caller, action, img);
}

void ImageIface::setSelection(const QString& caller, const FilterAction& action, const DImg& img)
{
    if (img.hasAlpha()   != originalHasAlpha()     ||
        img.sixteenBit() != originalSixteenBit()   ||
        img.size()       != selectionRect().size()
       )
    {
        kDebug() << "Properties of image to overwrite selection differs than original image";
        return;
    }

    if (img.isNull())
    {
        kDebug() << "No image data to handle";
        return;
    }

    d->core->putImgSelection(caller, action, img);
}

void FingerPrintsGenerator::slotGotImagePreview(const LoadingDescription& desc, const DImg& img)
{
    if (d->allPicturesPath.isEmpty())
    {
        return;
    }

    if (d->allPicturesPath.first() != desc.filePath)
    {
        return;
    }

    if (!img.isNull())
    {
        // compute Haar fingerprint
        d->haarIface.indexImage(desc.filePath, img);
    }

    QPixmap pix = DImg(img).smoothScale(128, 128, Qt::KeepAspectRatio).convertToPixmap();
    addedAction(pix, desc.filePath);
    advance(1);

    if (!d->allPicturesPath.isEmpty())
    {
        d->allPicturesPath.removeFirst();
    }

    if (d->allPicturesPath.isEmpty())
    {
        complete();
    }
    else
    {
        processOne();
    }
}

void HSLFilter::applyHSL(DImg& image)
{
    if (image.isNull())
    {
        return;
    }

    bool   sixteenBit     = image.sixteenBit();
    uint   numberOfPixels = image.numPixels();
    int    progress;
    int    hue, sat, lig;
    double vib = d->settings.vibrance;
    DColor color;

    if (sixteenBit)                   // 16 bits image.
    {
        unsigned short* data = (unsigned short*) image.bits();

        for (uint i=0; runningFlag() && (i<numberOfPixels); ++i)
        {
            color = DColor(data[2], data[1], data[0], 0, sixteenBit);

            // convert RGB to HSL
            color.getHSL(&hue, &sat, &lig);

            // convert HSL to RGB
            color.setHSL(d->htransfer16[hue], vibranceBias(d->stransfer16[sat], hue, vib, sixteenBit), d->ltransfer16[lig], sixteenBit);

            data[2] = color.red();
            data[1] = color.green();
            data[0] = color.blue();

            data += 4;

            progress = (int)(((double)i * 100.0) / numberOfPixels);

            if ( progress%5 == 0 )
            {
                postProgress( progress );
            }
        }
    }
    else                                      // 8 bits image.
    {
        uchar* data = image.bits();

        for (uint i=0; runningFlag() && (i<numberOfPixels); ++i)
        {
            color = DColor(data[2], data[1], data[0], 0, sixteenBit);

            // convert RGB to HSL
            color.getHSL(&hue, &sat, &lig);

            // convert HSL to RGB
            color.setHSL(d->htransfer[hue], vibranceBias(d->stransfer[sat],hue,vib,sixteenBit), d->ltransfer[lig], sixteenBit);

            data[2] = color.red();
            data[1] = color.green();
            data[0] = color.blue();

            data += 4;

            progress = (int)(((double)i * 100.0) / numberOfPixels);

            if ( progress%5 == 0 )
            {
                postProgress( progress );
            }
        }
    }
}

//.........这里部分代码省略.........
                // emergency fallback - nothing is visible
                x = qMax( (maxWidth - boxWidth)   / 2, 0);
                y = qMax( (maxHeight - boxHeight) / 2, 0);
            }

            // invalidate position hint, use only once
            d->positionHint = QRect();
        }
        else
        {
            // use standard position
            x = qMax( (maxWidth - boxWidth)   / 2, 0);
            y = qMax( (maxHeight - boxHeight) / 2, 0);
        }
    }

    // create a rectangle relative to image
    QRect drawRect( x, y, fontWidth + 2 * borderWidth + 2 * spacing, fontHeight + 2 * borderWidth  + 2 * spacing);

    // create a rectangle relative to textArea, excluding the border
    QRect textAreaBackgroundRect( borderWidth, borderWidth, fontWidth + 2 * spacing, fontHeight + 2 * spacing);

    // create a rectangle relative to textArea, excluding the border and spacing
    QRect textAreaTextRect( borderWidth + spacing, borderWidth + spacing, fontWidth, fontHeight );

    // create a rectangle relative to textArea, including the border,
    // for drawing the rectangle, taking into account that the width of the QPen goes in and out in equal parts
    QRect textAreaDrawRect( borderWidth / 2, borderWidth / 2, fontWidth + borderWidth + 2 * spacing,
                            fontHeight + borderWidth + 2 * spacing );

    // cut out the text area
    DImg textArea = image->copy(drawRect);

    if (textArea.isNull())
    {
        return QRect();
    }

    // compose semi-transparent background over textArea
    DColorComposer* composer = DColorComposer::getComposer(DColorComposer::PorterDuffNone);

    if (transparentBackground)
    {
        DImg transparentLayer(textAreaBackgroundRect.width(), textAreaBackgroundRect.height(), textArea.sixteenBit(), true);
        DColor transparent(backgroundColor);
        transparent.setAlpha(d->transparency);

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

        transparentLayer.fill(transparent);
        textArea.bitBlendImage(composer, &transparentLayer, 0, 0, transparentLayer.width(), transparentLayer.height(),
                               textAreaBackgroundRect.x(), textAreaBackgroundRect.y());
    }

    DImg textNotDrawn;

    if (textArea.sixteenBit())
    {
        textNotDrawn = textArea.copy();
        textNotDrawn.convertToEightBit();
    }
    else
    {

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.........