org.apache.fop.render.ps.fonts.PSTTFGlyphOutputStream Maven / Gradle / Ivy
/*
* 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();
}
}