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fonts/type3_subsetting

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/*

 * $Id: type3_subsetting.java,v 1.9 2013/01/15 10:24:51 stm Exp $

 *

 * Type 3 subsetting:

 * Demonstrate Type 3 font definition, use, and subsetting

 *

 * In the first definition pass, create the "T3font" widths-only font by

 * supplying all font and glyph metrics.

 * Load the "T3font" font with "subsetting" and output some text.

 * In the second definition pass, supply all glyph descriptions for the font.

 * With the "subsetting" option PDFlib will include only those glyphs in the

 * font which are actually used in the document in order to reduce the overall

 * file size. However, the full metrics must be supplied in the first pass of

 * the font definition.

 *

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

 * Required data: none

 */

package com.pdflib.cookbook.pdflib.fonts;


import com.pdflib.pdflib;

import com.pdflib.PDFlibException;


public class type3_subsetting {

    private static void define_font(pdflib p, int pass) throws PDFlibException,

        Exception {

        int image;


        int data[][] = {

            { 0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x84, 0x04, 0x7C, 0x84, 0x84,

                0x8C, 0x76, 0x00, 0x00, 0x00 }, /* "a" */

            { 0x00, 0x00, 0xC0, 0x40, 0x40, 0x5C, 0x62, 0x42, 0x42, 0x42, 0x42,

                0x62, 0xDC, 0x00, 0x00, 0x00 } }; /* "b" */


        /*

         * From the data defining three glyphs, create three PVFs

         * "/pvf/font/bitmap0" ... "/pvf/font/bitmap2"

         */

        if (pass == 2) {

            byte[] glyphdef = new byte[data[0].length];


            for (int i = 0; i < 2; i++) {

                for (int j = 0; j < data[0].length; j++)

                    glyphdef[j] = (byte) data[i][j];


                p.create_pvf("/pvf/font/bitmap" + i, glyphdef, "");

            }

        }


        /*

         * Create the "T3font" widths-only font in pass 1

         */

        p.begin_font("T3Font", 1 / 16.0, 0, 0, 1 / 16.0, 0, -3 / 16.0,

            pass == 1 ? "widthsonly=true" : "");


        /*

         * The .notdef (fallback) glyph should be contained in all Type 3 fonts

         * to avoid problems with some PDF viewers. It is usually empty.

         * Therefore we don't have to distinguish between pass 1 and pass 2.

         */

        p.begin_glyph_ext(0x0000, "width=8");

        p.end_glyph();


        /* Define the glyph "a" */

        p.begin_glyph_ext(0x0061, "width=8 boundingbox={0 0 8 16}");


        /*

         * In pass 2, load the bitmap data for the glyph from the PVF. The

         * "inline" option is provided so that load_image() will internally

         * perform the equivalent of fit_image(image, 0, 0, "") and

         * close_image(image).

         */

        String optlist =

            "inline bpc=1 components=1 height=16 width=8 mask invert";


        if (pass == 2) {

            image = p.load_image("raw", "/pvf/font/bitmap0", optlist);

            if (image == -1 && p.get_errnum() > 0)

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

        }


        p.end_glyph();


        /* Define the glyph "b" */

        p.begin_glyph_ext(0x0062, "width=8 boundingbox={0 0 8 16}");


        if (pass == 2) {

            image = p.load_image("raw", "/pvf/font/bitmap1", optlist);

            if (image == -1 && p.get_errnum() > 0)

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

        }


        p.end_glyph();


        /* ...define all glyph descriptions... */


        p.end_font();

    }


    public static void main(String argv[]) {

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

        String searchpath = "../input";

        String outfile = "type3_subsetting.pdf";

        String title = "Type 3 Subsetting";


        pdflib p = null;

        int font;


        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: 1.9 $");


            /* Pass 1: Create the widths-only font to make it known to PDFlib */

            define_font(p, 1);


            /*

             * Create some text on the page with glyphs from the font. Loading

             * the font with the "subsetting" option will include only those

             * glyphs in the font which are actually used in the document.

             */

            p.begin_page_ext(595, 842, "");


            font = p.load_font("T3Font", "unicode", "subsetting");

            if (font == -1)

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


            p.fit_textline("a", 50, 700, "font=" + font + " fontsize=36");


            p.end_page_ext("");


            /* Pass 2: Supply glyph descriptions for the font */

            define_font(p, 2);


            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");

        }

        catch (Exception e) {

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

        }

        finally {

            if (p != null) {

                p.delete();

            }

        }

    }

}