org.apache.fop.render.ps.fonts.PSTTFGlyphOutputStream Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of fop Show documentation

Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF.

There is a newer version: 2.9

Show newest version

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id$ */

package org.apache.fop.render.ps.fonts;

import java.io.IOException;

import org.apache.fop.fonts.truetype.TTFGlyphOutputStream;

/**
 * Streams glyphs in accordance with the constraints of the PostScript file format.
 * Mainly, PostScript strings have a limited capacity and the font data may have to be
 * broken down into several strings; however, this must occur at well-defined places like
 * table or glyph boundaries. See also Adobe Technical Note #5012, The Type 42 Font
 * Format Specification.
 */
public class PSTTFGlyphOutputStream implements TTFGlyphOutputStream {

    /** Total number of bytes written so far. */
    private int byteCounter;

    private int lastStringBoundary;

    private PSTTFGenerator ttfGen;

    /**
     * Constructor
     * @param ttfGen PSTTFGenerator
     */
    public PSTTFGlyphOutputStream(PSTTFGenerator ttfGen) {
        this.ttfGen = ttfGen;
    }

    public void startGlyphStream() throws IOException {
        ttfGen.startString();
    }

    public void streamGlyph(byte[] glyphData, int offset, int size) throws IOException {
        if (size > PSTTFGenerator.MAX_BUFFER_SIZE) {
            throw new UnsupportedOperationException("The glyph is " + size
                    + " bytes. There may be an error in the font file.");
        }

        if (size + (byteCounter - lastStringBoundary) < PSTTFGenerator.MAX_BUFFER_SIZE) {
            ttfGen.streamBytes(glyphData, offset, size);
        } else {
            ttfGen.endString();
            lastStringBoundary = byteCounter;
            ttfGen.startString();
            ttfGen.streamBytes(glyphData, offset, size);
        }
        byteCounter += size;
    }

    public void endGlyphStream() throws IOException {
        ttfGen.endString();
    }

}