C++ SPDesktop::getMessageStack方法代码示例

void Tracer::traceThread()
{
    //## Remember. NEVER leave this method without setting
    //## engine back to NULL

    //## Prepare our kill flag.  We will watch this later to
    //## see if the main thread wants us to stop
    keepGoing = true;

    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if (!desktop)
        {
        g_warning("Trace: No active desktop\n");
        return;
        }

    Inkscape::MessageStack *msgStack = desktop->getMessageStack();

    Inkscape::Selection *selection = desktop->getSelection();

    if (!SP_ACTIVE_DOCUMENT)
        {
        char *msg = _("Trace: No active document");
        msgStack->flash(Inkscape::ERROR_MESSAGE, msg);
        //g_warning(msg);
        engine = NULL;
        return;
        }
    SPDocument *doc = SP_ACTIVE_DOCUMENT;
    doc->ensureUpToDate();


    SPImage *img = getSelectedSPImage();
    if (!img)
        {
        engine = NULL;
        return;
        }

    GdkPixbuf *trace_pb = gdk_pixbuf_copy(img->pixbuf->getPixbufRaw(false));
    if (img->pixbuf->pixelFormat() == Inkscape::Pixbuf::PF_CAIRO) {
        convert_pixels_argb32_to_pixbuf(
            gdk_pixbuf_get_pixels(trace_pb),
            gdk_pixbuf_get_width(trace_pb),
            gdk_pixbuf_get_height(trace_pb),
            gdk_pixbuf_get_rowstride(trace_pb));
    }

    Glib::RefPtr<Gdk::Pixbuf> pixbuf = Glib::wrap(trace_pb, false);

    pixbuf = sioxProcessImage(img, pixbuf);

    if (!pixbuf)
        {
        char *msg = _("Trace: Image has no bitmap data");
        msgStack->flash(Inkscape::ERROR_MESSAGE, msg);
        //g_warning(msg);
        engine = NULL;
        return;
        }

    msgStack->flash(Inkscape::NORMAL_MESSAGE, _("Trace: Starting trace..."));
    desktop->updateCanvasNow();

    std::vector<TracingEngineResult> results =
                engine->trace(pixbuf);
    //printf("nrPaths:%d\n", results.size());
    int nrPaths = results.size();

    //### Check if we should stop
    if (!keepGoing || nrPaths<1)
        {
        engine = NULL;
        return;
        }

    //### Get pointers to the <image> and its parent
    //XML Tree being used directly here while it shouldn't be.
    Inkscape::XML::Node *imgRepr   = SP_OBJECT(img)->getRepr();
    Inkscape::XML::Node *par       = imgRepr->parent();

    //### Get some information for the new transform()
    double x      = 0.0;
    double y      = 0.0;
    double width  = 0.0;
    double height = 0.0;
    double dval   = 0.0;

    if (sp_repr_get_double(imgRepr, "x", &dval))
        x = dval;
    if (sp_repr_get_double(imgRepr, "y", &dval))
        y = dval;

    if (sp_repr_get_double(imgRepr, "width", &dval))
        width = dval;
    if (sp_repr_get_double(imgRepr, "height", &dval))
        height = dval;

    double iwidth  = (double)pixbuf->get_width();
    double iheight = (double)pixbuf->get_height();
//.........这里部分代码省略.........

SPImage *Tracer::getSelectedSPImage()
{

    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if (!desktop)
        {
        g_warning("Trace: No active desktop");
        return NULL;
        }

    Inkscape::MessageStack *msgStack = desktop->getMessageStack();

    Inkscape::Selection *sel = desktop->getSelection();
    if (!sel)
        {
        char *msg = _("Select an <b>image</b> to trace");
        msgStack->flash(Inkscape::ERROR_MESSAGE, msg);
        //g_warning(msg);
        return NULL;
        }

    if (sioxEnabled)
        {
        SPImage *img = NULL;
        std::vector<SPItem*> const list = sel->itemList();
        std::vector<SPItem *> items;
        sioxShapes.clear();

        /*
           First, things are selected top-to-bottom, so we need to invert
           them as bottom-to-top so that we can discover the image and any
           SPItems above it
        */
        for (std::vector<SPItem*>::const_iterator i=list.begin() ; list.end()!=i ; ++i)
            {
            if (!SP_IS_ITEM(*i))
                {
                continue;
                }
            SPItem *item = *i;
            items.insert(items.begin(), item);
            }
        std::vector<SPItem *>::iterator iter;
        for (iter = items.begin() ; iter!= items.end() ; ++iter)
            {
            SPItem *item = *iter;
            if (SP_IS_IMAGE(item))
                {
                if (img) //we want only one
                    {
                    char *msg = _("Select only one <b>image</b> to trace");
                    msgStack->flash(Inkscape::ERROR_MESSAGE, msg);
                    return NULL;
                    }
                img = SP_IMAGE(item);
                }
            else // if (img) //# items -after- the image in tree (above it in Z)
                {
                if (SP_IS_SHAPE(item))
                    {
                    SPShape *shape = SP_SHAPE(item);
                    sioxShapes.push_back(shape);
                    }
                }
            }

        if (!img || sioxShapes.size() < 1)
            {
            char *msg = _("Select one image and one or more shapes above it");
            msgStack->flash(Inkscape::ERROR_MESSAGE, msg);
            return NULL;
            }
        return img;
        }
    else
        //### SIOX not enabled.  We want exactly one image selected
        {
        SPItem *item = sel->singleItem();
        if (!item)
            {
            char *msg = _("Select an <b>image</b> to trace");  //same as above
            msgStack->flash(Inkscape::ERROR_MESSAGE, msg);
            //g_warning(msg);
            return NULL;
            }

        if (!SP_IS_IMAGE(item))
            {
            char *msg = _("Select an <b>image</b> to trace");
            msgStack->flash(Inkscape::ERROR_MESSAGE, msg);
            //g_warning(msg);
            return NULL;
            }

        SPImage *img = SP_IMAGE(item);

        return img;
        }

}

Glib::RefPtr<Gdk::Pixbuf> Tracer::sioxProcessImage(SPImage *img, Glib::RefPtr<Gdk::Pixbuf>origPixbuf)
{
    if (!sioxEnabled)
        return origPixbuf;

    if (origPixbuf == lastOrigPixbuf)
        return lastSioxPixbuf;

    //g_message("siox: start");

    //Convert from gdk, so a format we know.  By design, the pixel
    //format in PackedPixelMap is identical to what is needed by SIOX
    SioxImage simage(origPixbuf->gobj());

    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    if (!desktop)
        {
        g_warning("%s", _("Trace: No active desktop"));
        return Glib::RefPtr<Gdk::Pixbuf>(NULL);
        }

    Inkscape::MessageStack *msgStack = desktop->getMessageStack();

    Inkscape::Selection *sel = desktop->getSelection();
    if (!sel)
        {
        char *msg = _("Select an <b>image</b> to trace");
        msgStack->flash(Inkscape::ERROR_MESSAGE, msg);
        //g_warning(msg);
        return Glib::RefPtr<Gdk::Pixbuf>(NULL);
        }

    Inkscape::DrawingItem *aImg = img->get_arenaitem(desktop->dkey);
    //g_message("img: %d %d %d %d\n", aImg->bbox.x0, aImg->bbox.y0,
    //                                aImg->bbox.x1, aImg->bbox.y1);

    double width  = aImg->geometricBounds()->width();
    double height = aImg->geometricBounds()->height();

    double iwidth  = simage.getWidth();
    double iheight = simage.getHeight();

    double iwscale = width  / iwidth;
    double ihscale = height / iheight;

    std::vector<Inkscape::DrawingItem *> arenaItems;
    std::vector<SPShape *>::iterator iter;
    for (iter = sioxShapes.begin() ; iter!=sioxShapes.end() ; ++iter)
        {
        SPItem *item = *iter;
        Inkscape::DrawingItem *aItem = item->get_arenaitem(desktop->dkey);
        arenaItems.push_back(aItem);
        }

    //g_message("%d arena items\n", arenaItems.size());

    //PackedPixelMap *dumpMap = PackedPixelMapCreate(
    //                simage.getWidth(), simage.getHeight());

    //g_message("siox: start selection");

    for (int row=0 ; row<iheight ; row++)
        {
        double ypos = aImg->geometricBounds()->top() + ihscale * (double) row;
        for (int col=0 ; col<simage.getWidth() ; col++)
            {
            //Get absolute X,Y position
            double xpos = aImg->geometricBounds()->left() + iwscale * (double)col;
            Geom::Point point(xpos, ypos);
            point *= aImg->transform();
            //point *= imgMat;
            //point = desktop->doc2dt(point);
            //g_message("x:%f    y:%f\n", point[0], point[1]);
            bool weHaveAHit = false;
            std::vector<Inkscape::DrawingItem *>::iterator aIter;
            for (aIter = arenaItems.begin() ; aIter!=arenaItems.end() ; ++aIter)
                {
                Inkscape::DrawingItem *arenaItem = *aIter;
                if (arenaItem->pick(point, 1.0f, 1))
                    {
                    weHaveAHit = true;
                    break;
                    }
                }

            if (weHaveAHit)
                {
                //g_message("hit!\n");
                //dumpMap->setPixelLong(dumpMap, col, row, 0L);
                simage.setConfidence(col, row,
                        Siox::UNKNOWN_REGION_CONFIDENCE);
                }
            else
                {
                //g_message("miss!\n");
                //dumpMap->setPixelLong(dumpMap, col, row,
                //        simage.getPixel(col, row));
                simage.setConfidence(col, row,
                        Siox::CERTAIN_BACKGROUND_CONFIDENCE);
                }
//.........这里部分代码省略.........