itextpdf实现文字路径裁切图片

        实现文字路径裁切后的图片是属于艺术字的一种，底图是一个图片，然后只留下字体裁切的路径的图片，使用itextpdf需要实现如下效果：

    后台代码：

public void artTextWithImage() throws Exception {
        String cmpPdf = "E:/pdfTest/artText/artText_09.pdf";
        String imgSrc="E:/pdfTest/itextpdf/EoclipTest/qiu_cmyk.jpg";
        ImageData imageData = ImageDataFactory.create(imgSrc);
        Image image = new Image(imageData);        
        PdfWriter writer = new PdfWriter(cmpPdf);
        PdfDocument doc = new PdfDocument(writer);
        PageSize pageSize = new PageSize(800,800);
        PdfPage page = doc.addNewPage(pageSize);
        doc.setDefaultPageSize(pageSize);
        PdfFont font = PdfFontFactory.createFont("E:/pdfTest/artText/FreeSans.ttf", "WinAnsi", true);
        PdfCanvas canvas = new PdfCanvas(page);  
        String line = "Hello";
        float fontSize = 60;      
        float top=getDrawTop(fontSize);
    	float w=font.getWidth(line,fontSize);
        Rectangle rect1 = new Rectangle(36, 700,w,top);       
                canvas
                .beginText()
                .moveText(36, 700)
                .setFontAndSize(font, fontSize)  
                .setTextRenderingMode(PdfCanvasConstants.TextRenderingMode.CLIP) 
                .showText(line)                              
                .endText()
                .clip()
                .newPath();

                PdfXObject pdfXobjet = image.getXObject();
                canvas.addXObject(pdfXobjet, rect1);
                 doc.close();

    }