org.apache.fontbox.cff.CFFCharset 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.cff;
import java.util.HashMap;
import java.util.Map;
/**
* A CFF charset. A charset is an array of SIDs/CIDs for all glyphs in the font.
*
* todo: split this into two? CFFCharsetType1 and CFFCharsetCID ?
*
* @author John Hewson
*/
public abstract class CFFCharset
{
private final boolean isCIDFont;
private final Map sidOrCidToGid = new HashMap(250);
private final Map gidToSid = new HashMap(250);
private final Map nameToSid = new HashMap(250);
// inverse
private final Map gidToCid = new HashMap();
private final Map gidToName = new HashMap(250);
/**
* Package-private constructor for use by subclasses.
*
* @param isCIDFont true if the parent font is a CIDFont
*/
CFFCharset(boolean isCIDFont)
{
this.isCIDFont = isCIDFont;
}
/**
* Indicates if the charset belongs to a CID font.
*
* @return true for CID fonts
*/
public boolean isCIDFont()
{
return isCIDFont;
}
/**
* Adds a new GID/SID/name combination to the charset.
*
* @param gid GID
* @param sid SID
*/
public void addSID(int gid, int sid, String name)
{
if (isCIDFont)
{
throw new IllegalStateException("Not a Type 1-equivalent font");
}
sidOrCidToGid.put(sid, gid);
gidToSid.put(gid, sid);
nameToSid.put(name, sid);
gidToName.put(gid, name);
}
/**
* Adds a new GID/CID combination to the charset.
*
* @param gid GID
* @param cid CID
*/
public void addCID(int gid, int cid)
{
if (!isCIDFont)
{
throw new IllegalStateException("Not a CIDFont");
}
sidOrCidToGid.put(cid, gid);
gidToCid.put(gid, cid);
}
/**
* Returns the SID for a given GID. SIDs are internal to the font and are not public.
*
* @param sid SID
* @return GID
*/
int getSIDForGID(int sid)
{
if (isCIDFont)
{
throw new IllegalStateException("Not a Type 1-equivalent font");
}
Integer gid = gidToSid.get(sid);
if (gid == null)
{
return 0;
}
return gid;
}
/**
* Returns the GID for the given SID. SIDs are internal to the font and are not public.
*
* @param sid SID
* @return GID
*/
int getGIDForSID(int sid)
{
if (isCIDFont)
{
throw new IllegalStateException("Not a Type 1-equivalent font");
}
Integer gid = sidOrCidToGid.get(sid);
if (gid == null)
{
return 0;
}
return gid;
}
/**
* Returns the GID for a given CID. Returns 0 if the CID is missing.
*
* @param cid CID
* @return GID
*/
public int getGIDForCID(int cid)
{
if (!isCIDFont)
{
throw new IllegalStateException("Not a CIDFont");
}
Integer gid = sidOrCidToGid.get(cid);
if (gid == null)
{
return 0;
}
return gid;
}
/**
* Returns the SID for a given PostScript name, you would think this is not needed,
* but some fonts have glyphs beyond their encoding with charset SID names.
*
* @param name PostScript glyph name
* @return SID
*/
int getSID(String name)
{
if (isCIDFont)
{
throw new IllegalStateException("Not a Type 1-equivalent font");
}
Integer sid = nameToSid.get(name);
if (sid == null)
{
return 0;
}
return sid;
}
/**
* Returns the PostScript glyph name for the given GID.
*
* @param gid GID
* @return PostScript glyph name
*/
public String getNameForGID(int gid)
{
if (isCIDFont)
{
throw new IllegalStateException("Not a Type 1-equivalent font");
}
return gidToName.get(gid);
}
/**
* Returns the CID for the given GID.
*
* @param gid GID
* @return CID
*/
public int getCIDForGID(int gid)
{
if (!isCIDFont)
{
throw new IllegalStateException("Not a CIDFont");
}
Integer cid = gidToCid.get(gid);
if (cid != null)
{
return cid;
}
return 0;
}
}