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images/image_mask

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/* $Id: image_mask.java,v 1.10 2017/01/24 14:06:54 stm Exp $

 * Image mask:

 * Place an image with a mask applied to it

 *

 * Place an image and apply a Grayscale mask on it. Depending on the values

 * contained in the mask, the image pixels will be displayed more or less

 * transparent. Smaller (darker) mask values result in more transparent image

 * pixels and larger (lighter) values in less transparency.

 *

 * Required software: PDFlib/PDFlib+PDI/PPS 9

 * Required data: image file

 */

package com.pdflib.cookbook.pdflib.images;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class image_mask

{

    public static void main (String argv[])

    {

        /* This is where the data files are. Adjust as necessary. */

        String searchpath = "../input";

        String outfile = "image_mask.pdf";

        String title = "Image Mask";


        pdflib p = null;

        int exitcode = 0;

        String imagefile = "sky.jpg";

        String maskfile = "image_mask.jpg";

        int font, image, mask, masked_image;

     

        try {

            p = new pdflib();


            p.set_option("searchpath={" + searchpath + "}");


            /* This means we must check return values of load_font() etc. */

            p.set_option("errorpolicy=return");


            if (p.begin_document(outfile, "") == -1)

                throw new Exception("Error: " + p.get_errmsg());


            p.set_info("Creator", "PDFlib Cookbook");

            p.set_info("Title", title + " $Revision: 1.10 $");

            

            /* Load the original image */

            image = p.load_image("auto", imagefile, "");

            if (image == -1)

                throw new Exception("Error: " + p.get_errmsg());


            /*

             * Load the Grayscale image to be used as the transparency mask.

             * It must not have an ICC profile, as an image with an ICCBased

             * colorspace cannot be used as a mask.

             */

            mask = p.load_image("auto", maskfile, "honoriccprofile=false");

            if (mask == -1)

                throw new Exception("Error: " + p.get_errmsg());

            

            /* Load the image with the transparency mask being assigned to it */

            masked_image = p.load_image("auto", imagefile, "masked " + mask);

            if (masked_image == -1)

                throw new Exception("Error: " + p.get_errmsg());

            

            /* Load font */

            font = p.load_font("Helvetica", "unicode", "");

            if (font == -1)

                throw new Exception("Error: " + p.get_errmsg());


            /* Start a page with a size similar to the image dimensions.

             * The "transparencygroup" option improves output quality when placing

             * the image on a page which contains transparent objects (image or

             * other).

             * PDFlib 7.0.3 will automatically create the "transparencygroup"

             * option, so it is only required in earlier versions.

             */

            p.begin_page_ext(0, 0, "width=a4.height height=a4.width " +

                "transparencygroup={CS=DeviceRGB}");

            

            /* Place the original image */

            p.fit_image(image, 50, 150, "boxsize {200 500} fitmethod=meet");

            p.fit_textline("Original image", 50, 130, "font=" + font +

                " fontsize=14");

            

            /* Place the image without the clipping path being applied to it */

            p.fit_image(mask, 300, 150, "boxsize {200 500} fitmethod=meet");

            p.fit_textline("Transparency mask", 300, 130, "font=" + font +

                " fontsize=14");

            

            /* Place the image with the clipping path being applied to it */

            p.fit_image(masked_image, 550, 150, "boxsize {200 500} fitmethod=meet");

            p.fit_textline("Image with the transparency mask applied.", 550, 130,

                "font=" + font + " fontsize=10");

            p.fit_textline("Darker mask values result in more transparent image " +

                "values.", 550, 110, "font=" + font + " fontsize=10");

                    

            /* Close the images */

            p.close_image(image);

            p.close_image(mask);

            p.close_image(masked_image);

        

            p.end_page_ext("");

            p.end_document("");


        } catch (PDFlibException e) {

            System.err.print("PDFlib exception occurred:\n");

            System.err.print("[" + e.get_errnum() + "] " + e.get_apiname() +

                ": " + e.get_errmsg() + "\n");

            exitcode = 1;

        } catch (Exception e) {

            System.err.println(e.getMessage());

            exitcode = 1;

        } finally {

            if (p != null) {

                p.delete();

            }

            System.exit(exitcode);

        }

    }

}