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/*
* Typecast
*
* Copyright © 2004-2019 David Schweinsberg
*
* Licensed 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 net.java.dev.typecast.ot;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import net.java.dev.typecast.ot.table.*;
/**
* The TrueType font.
* @author <a href="mailto:david.schweinsberg@gmail.com">David Schweinsberg</a>
*/
public abstract class OTFont {
private Os2Table _os2;
private CmapTable _cmap;
private HeadTable _head;
private HheaTable _hhea;
private HmtxTable _hmtx;
private MaxpTable _maxp;
private NameTable _name;
private PostTable _post;
private VheaTable _vhea;
private GsubTable _gsub;
/**
* @param fontData OpenType/TrueType font file data.
* @param directoryOffset The Table Directory offset within the file. For a
* regular TTF/OTF file this will be zero, but for a TTC (Font Collection)
* the offset is retrieved from the TTC header. For a Mac font resource,
* offset is retrieved from the resource headers.
* @param tablesOrigin The point the table offsets are calculated from.
* Once again, in a regular TTF file, this will be zero. In a TTC is is
* also zero, but within a Mac resource, it is the beginning of the
* individual font resource data.
* @throws java.io.IOException
*/
OTFont(byte[] fontData, int tablesOrigin) throws IOException {
// Load the table directory
// dis.skip(directoryOffset);
TableDirectory tableDirectory = new TableDirectory(fontData);
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(fontData));
dis.mark(fontData.length);
dis.reset();
// Load some prerequisite tables
// (These are tables that are referenced by other tables, so we need to load
// them first)
seekTable(tableDirectory, dis, tablesOrigin, Table.head);
_head = new HeadTable(dis);
// 'hhea' is required by 'hmtx'
seekTable(tableDirectory, dis, tablesOrigin, Table.hhea);
_hhea = new HheaTable(dis);
// 'maxp' is required by 'glyf', 'hmtx', 'loca', and 'vmtx'
seekTable(tableDirectory, dis, tablesOrigin, Table.maxp);
_maxp = new MaxpTable(dis);
// 'vhea' is required by 'vmtx'
int length = seekTable(tableDirectory, dis, tablesOrigin, Table.vhea);
if (length > 0) {
_vhea = new VheaTable(dis);
}
// 'post' is required by 'glyf'
seekTable(tableDirectory, dis, tablesOrigin, Table.post);
_post = new PostTable(dis);
// Load all the other required tables
seekTable(tableDirectory, dis, tablesOrigin, Table.cmap);
_cmap = new CmapTable(dis);
length = seekTable(tableDirectory, dis, tablesOrigin, Table.hmtx);
_hmtx = new HmtxTable(dis, length, _hhea, _maxp);
length = seekTable(tableDirectory, dis, tablesOrigin, Table.name);
_name = new NameTable(dis, length);
seekTable(tableDirectory, dis, tablesOrigin, Table.OS_2);
_os2 = new Os2Table(dis);
}
public Os2Table getOS2Table() {
return _os2;
}
public CmapTable getCmapTable() {
return _cmap;
}
public HeadTable getHeadTable() {
return _head;
}
public HheaTable getHheaTable() {
return _hhea;
}
public HmtxTable getHmtxTable() {
return _hmtx;
}
MaxpTable getMaxpTable() {
return _maxp;
}
public NameTable getNameTable() {
return _name;
}
public PostTable getPostTable() {
return _post;
}
public VheaTable getVheaTable() {
return _vhea;
}
public GsubTable getGsubTable() {
return _gsub;
}
public int getAscent() {
return _hhea.getAscender();
}
public int getDescent() {
return _hhea.getDescender();
}
public int getNumGlyphs() {
return _maxp.getNumGlyphs();
}
public abstract Glyph getGlyph(int i);
int seekTable(
TableDirectory tableDirectory,
DataInputStream dis,
int tablesOrigin,
int tag) throws IOException {
dis.reset();
TableDirectory.Entry entry = tableDirectory.getEntryByTag(tag);
if (entry == null) {
return 0;
}
dis.skip(tablesOrigin + entry.getOffset());
return entry.getLength();
}
public String toString() {
return _head.toString();
}
}
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