/* * 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, <em>The Type 42 Font * Format Specification</em>. */ 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(); } }