如何将.pptx文件（包括xslftable）转换为图像？

Question

当尝试通过POI版本3.8提供的XSLFSlide.draw()将.pptx文件转换为.png图像时，我遇到了一个问题。也就是说，由于我在同一张幻灯片中生成了XSLFTextBox和XSLFTable，因此slide.draw()方法仅转换文本框，而忽略该表。这是我的代码。

XMLSlideShow ppt = new XMLSlideShow();

    try {
        XSLFSlide slide = ppt.createSlide();
        XSLFTable tbl = slide.createTable();
        XSLFTextBox tbox = slide.createTextBox();
        XSLFTextRun trun = tbox.addNewTextParagraph().addNewTextRun();
        trun.setText("111");
        trun.setFontSize(40);
        tbox.setAnchor(new Rectangle(0, 0, 100, 50));
        tbl.setAnchor(new Rectangle(50, 50, 450, 300));
        int numColumns = 3;
        int numRows = 5;
        XSLFTableRow headerRow = tbl.addRow();
        headerRow.setHeight(50.0D);

        int rownum;
        for (rownum = 0; rownum < numColumns; ++rownum) {
            XSLFTableCell th = headerRow.addCell();
            XSLFTextParagraph p = th.addNewTextParagraph();
            p.setTextAlign(TextAlign.CENTER);
            XSLFTextRun r = p.addNewTextRun();
            r.setText("Header " + (rownum + 1));
            r.setBold(true);
            r.setFontColor(Color.white);
            th.setFillColor(new Color(79, 129, 189));
            tbl.setColumnWidth(rownum, 150.0D);
        }

        for (rownum = 0; rownum < numRows; ++rownum) {
            XSLFTableRow tr = tbl.addRow();
            tr.setHeight(50.0D);

            for (int i = 0; i < numColumns; ++i) {
                XSLFTableCell cell = tr.addCell();
                XSLFTextParagraph p = cell.addNewTextParagraph();
                XSLFTextRun r = p.addNewTextRun();
                r.setText("Cell " + (i + 1));
                if (rownum % 2 == 0) {
                    cell.setFillColor(new Color(208, 216, 232));
                } else {
                    cell.setFillColor(new Color(233, 247, 244));
                }
            }
        }

        FileOutputStream out = new FileOutputStream("table.pptx");
        ppt.write(out);
        BufferedImage img = new BufferedImage(ppt.getPageSize().width, ppt.getPageSize().height, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = img.createGraphics();
        graphics.fill(new Rectangle(0, 0, ppt.getPageSize().width, ppt.getPageSize().height));
        graphics.setPaint(Color.BLUE);

        slide.draw(graphics);
        FileOutputStream fos = new FileOutputStream("test.png");
        ImageIO.write(img, "PNG", fos);
        } catch (IOException e) {
            e.printStackTrace();
        }

这些是结果.pptx和.png 他们中有谁知道如何解决这个问题吗？