org.apache.fontbox.ttf.TrueTypeCollection 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.
*/
package org.apache.fontbox.ttf;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
/**
* A TrueType Collection, now more properly known as a "Font Collection" as it may contain either
* TrueType or OpenType fonts.
*
* @author John Hewson
*/
public class TrueTypeCollection implements Closeable
{
private final TTFDataStream stream;
private final int numFonts;
private final long[] fontOffsets;
/**
* Creates a new TrueTypeCollection from a .ttc file.
*
* @param file The TTC file.
* @throws IOException If the font could not be parsed.
*/
public TrueTypeCollection(File file) throws IOException
{
this(new RAFDataStream(file, "r"));
}
/**
* Creates a new TrueTypeCollection from a .ttc input stream.
*
* @param stream A TTC input stream.
* @throws IOException If the font could not be parsed.
*/
public TrueTypeCollection(InputStream stream) throws IOException
{
this(new MemoryTTFDataStream(stream));
}
/**
* Creates a new TrueTypeCollection from a TTC stream.
*
* @param stream The TTF file.
* @throws IOException If the font could not be parsed.
*/
TrueTypeCollection(TTFDataStream stream) throws IOException
{
this.stream = stream;
// TTC header
String tag = stream.readTag();
if (!tag.equals("ttcf"))
{
throw new IOException("Missing TTC header");
}
float version = stream.read32Fixed();
numFonts = (int)stream.readUnsignedInt();
fontOffsets = new long[numFonts];
for (int i = 0; i < numFonts; i++)
{
fontOffsets[i] = stream.readUnsignedInt();
}
if (version >= 2)
{
// not used at this time
int ulDsigTag = stream.readUnsignedShort();
int ulDsigLength = stream.readUnsignedShort();
int ulDsigOffset = stream.readUnsignedShort();
}
}
/**
* Run the callback for each TT font in the collection.
*
* @param trueTypeFontProcessor the object with the callback method.
* @throws IOException
*/
public void processAllFonts(TrueTypeFontProcessor trueTypeFontProcessor) throws IOException
{
for (int i = 0; i < numFonts; i++)
{
TrueTypeFont font = getFontAtIndex(i);
trueTypeFontProcessor.process(font);
}
}
private TrueTypeFont getFontAtIndex(int idx) throws IOException
{
stream.seek(fontOffsets[idx]);
TTFParser parser;
if (stream.readTag().equals("OTTO"))
{
parser = new OTFParser(false, true);
}
else
{
parser = new TTFParser(false, true);
}
stream.seek(fontOffsets[idx]);
return parser.parse(new TTCDataStream(stream));
}
/**
* Get a TT font from a collection.
*
* @param name The postscript name of the font.
* @return The found font, nor null if none is found.
* @throws IOException
*/
public TrueTypeFont getFontByName(String name) throws IOException
{
for (int i = 0; i < numFonts; i++)
{
TrueTypeFont font = getFontAtIndex(i);
if (font.getName().equals(name))
{
return font;
}
}
return null;
}
/**
* Implement the callback method to call {@link TrueTypeCollection#processAllFonts(TrueTypeFontProcessor)}.
*/
public interface TrueTypeFontProcessor
{
void process(TrueTypeFont ttf) throws IOException;
}
@Override
public void close() throws IOException
{
stream.close();
}
}