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org.apache.fontbox.cff.Type2CharString 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.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.apache.fontbox.type1.Type1CharStringReader;
/**
* Represents a Type 2 CharString by converting it into an equivalent Type 1 CharString.
*
* @author Villu Ruusmann
* @author John Hewson
*/
public class Type2CharString extends Type1CharString
{
private float defWidthX = 0;
private float nominalWidthX = 0;
private int pathCount = 0;
private final List type2sequence;
private final int gid;
/**
* Constructor.
* @param font Parent CFF font
* @param fontName font name
* @param glyphName glyph name (or CID as hex string)
* @param gid GID
* @param sequence Type 2 char string sequence
* @param defaultWidthX default width
* @param nomWidthX nominal width
*/
public Type2CharString(Type1CharStringReader font, String fontName, String glyphName, int gid, List sequence,
int defaultWidthX, int nomWidthX)
{
super(font, fontName, glyphName);
this.gid = gid;
type2sequence = sequence;
defWidthX = defaultWidthX;
nominalWidthX = nomWidthX;
convertType1ToType2(sequence);
}
/**
* Return the GID (glyph id) of this charstring.
*/
public int getGID()
{
return gid;
}
/**
* Returns the Type 2 charstring sequence.
*/
public List getType2Sequence()
{
return type2sequence;
}
/**
* Converts a sequence of Type 2 commands into a sequence of Type 1 commands.
* @param sequence the Type 2 char string sequence
*/
private void convertType1ToType2(List sequence)
{
type1Sequence = new ArrayList();
pathCount = 0;
CharStringHandler handler = new CharStringHandler() {
@Override
public List handleCommand(List numbers, CharStringCommand command)
{
return Type2CharString.this.handleCommand(numbers, command);
}
};
handler.handleSequence(sequence);
}
@SuppressWarnings(value = { "unchecked" })
private List handleCommand(List numbers, CharStringCommand command)
{
commandCount++;
String name = CharStringCommand.TYPE2_VOCABULARY.get(command.getKey());
if ("hstem".equals(name))
{
numbers = clearStack(numbers, numbers.size() % 2 != 0);
expandStemHints(numbers, true);
}
else if ("vstem".equals(name))
{
numbers = clearStack(numbers, numbers.size() % 2 != 0);
expandStemHints(numbers, false);
}
else if ("vmoveto".equals(name))
{
numbers = clearStack(numbers, numbers.size() > 1);
markPath();
addCommand(numbers, command);
}
else if ("rlineto".equals(name))
{
addCommandList(split(numbers, 2), command);
}
else if ("hlineto".equals(name))
{
drawAlternatingLine(numbers, true);
}
else if ("vlineto".equals(name))
{
drawAlternatingLine(numbers, false);
}
else if ("rrcurveto".equals(name))
{
addCommandList(split(numbers, 6), command);
}
else if ("endchar".equals(name))
{
numbers = clearStack(numbers, numbers.size() == 5 || numbers.size() == 1);
closePath();
if (numbers.size() == 4)
{
// deprecated "seac" operator
numbers.add(0, 0);
addCommand(numbers, new CharStringCommand(12, 6));
}
else
{
addCommand(numbers, command);
}
}
else if ("rmoveto".equals(name))
{
numbers = clearStack(numbers, numbers.size() > 2);
markPath();
addCommand(numbers, command);
}
else if ("hmoveto".equals(name))
{
numbers = clearStack(numbers, numbers.size() > 1);
markPath();
addCommand(numbers, command);
}
else if ("vhcurveto".equals(name))
{
drawAlternatingCurve(numbers, false);
}
else if ("hvcurveto".equals(name))
{
drawAlternatingCurve(numbers, true);
}
else if ("hflex".equals(name))
{
List first = Arrays.asList(numbers.get(0), 0,
numbers.get(1), numbers.get(2), numbers.get(3), 0);
List second = Arrays.asList(numbers.get(4), 0,
numbers.get(5), -(numbers.get(2).floatValue()),
numbers.get(6), 0);
addCommandList(Arrays.asList(first, second), new CharStringCommand(8));
}
else if ("flex".equals(name))
{
List first = numbers.subList(0, 6);
List second = numbers.subList(6, 12);
addCommandList(Arrays.asList(first, second), new CharStringCommand(8));
}
else if ("hflex1".equals(name))
{
List first = Arrays.asList(numbers.get(0), numbers.get(1),
numbers.get(2), numbers.get(3), numbers.get(4), 0);
List second = Arrays.asList(numbers.get(5), 0,
numbers.get(6), numbers.get(7), numbers.get(8), 0);
addCommandList(Arrays.asList(first, second), new CharStringCommand(8));
}
else if ("flex1".equals(name))
{
int dx = 0;
int dy = 0;
for(int i = 0; i < 5; i++)
{
dx += numbers.get(i * 2).intValue();
dy += numbers.get(i * 2 + 1).intValue();
}
List first = numbers.subList(0, 6);
List second = Arrays.asList(numbers.get(6), numbers.get(7), numbers.get(8),
numbers.get(9), (Math.abs(dx) > Math.abs(dy) ? numbers.get(10) : -dx),
(Math.abs(dx) > Math.abs(dy) ? -dy : numbers.get(10)));
addCommandList(Arrays.asList(first, second), new CharStringCommand(8));
}
else if ("hstemhm".equals(name))
{
numbers = clearStack(numbers, numbers.size() % 2 != 0);
expandStemHints(numbers, true);
}
else if ("hintmask".equals(name) || "cntrmask".equals(name))
{
numbers = clearStack(numbers, numbers.size() % 2 != 0);
if (!numbers.isEmpty())
{
expandStemHints(numbers, false);
}
}
else if ("vstemhm".equals(name))
{
numbers = clearStack(numbers, numbers.size() % 2 != 0);
expandStemHints(numbers, false);
}
else if ("rcurveline".equals(name))
{
if (numbers.size() >= 2)
{
addCommandList(split(numbers.subList(0, numbers.size() - 2), 6),
new CharStringCommand(8));
addCommand(numbers.subList(numbers.size() - 2, numbers.size()),
new CharStringCommand(5));
}
}
else if ("rlinecurve".equals(name))
{
if (numbers.size() >= 6)
{
addCommandList(split(numbers.subList(0, numbers.size() - 6), 2),
new CharStringCommand(5));
addCommand(numbers.subList(numbers.size() - 6, numbers.size()),
new CharStringCommand(8));
}
}
else if ("vvcurveto".equals(name))
{
drawCurve(numbers, false);
}
else if ("hhcurveto".equals(name))
{
drawCurve(numbers, true);
}
else
{
addCommand(numbers, command);
}
return null;
}
private List clearStack(List numbers, boolean flag)
{
if (type1Sequence.isEmpty())
{
if (flag)
{
addCommand(Arrays.asList((Number) 0f, numbers.get(0).floatValue() + nominalWidthX),
new CharStringCommand(13));
numbers = numbers.subList(1, numbers.size());
}
else
{
addCommand(Arrays.asList((Number) 0f, defWidthX),
new CharStringCommand(13));
}
}
return numbers;
}
/**
* @param numbers
* @param horizontal
*/
private void expandStemHints(List numbers, boolean horizontal)
{
// TODO
}
private void markPath()
{
if (pathCount > 0)
{
closePath();
}
pathCount++;
}
private void closePath()
{
CharStringCommand command = pathCount > 0 ? (CharStringCommand) type1Sequence
.get(type1Sequence.size() - 1)
: null;
CharStringCommand closepathCommand = new CharStringCommand(9);
if (command != null && !closepathCommand.equals(command))
{
addCommand(Collections. emptyList(), closepathCommand);
}
}
private void drawAlternatingLine(List numbers, boolean horizontal)
{
while (!numbers.isEmpty())
{
addCommand(numbers.subList(0, 1), new CharStringCommand(
horizontal ? 6 : 7));
numbers = numbers.subList(1, numbers.size());
horizontal = !horizontal;
}
}
private void drawAlternatingCurve(List numbers, boolean horizontal)
{
while (numbers.size() >= 4)
{
boolean last = numbers.size() == 5;
if (horizontal)
{
addCommand(Arrays.asList(numbers.get(0), 0,
numbers.get(1), numbers.get(2), last ? numbers.get(4)
: 0, numbers.get(3)),
new CharStringCommand(8));
}
else
{
addCommand(Arrays.asList(0, numbers.get(0),
numbers.get(1), numbers.get(2), numbers.get(3),
last ? numbers.get(4) : 0),
new CharStringCommand(8));
}
numbers = numbers.subList(last ? 5 : 4, numbers.size());
horizontal = !horizontal;
}
}
private void drawCurve(List numbers, boolean horizontal)
{
while (numbers.size() >= 4)
{
boolean first = numbers.size() % 4 == 1;
if (horizontal)
{
addCommand(Arrays.asList(numbers.get(first ? 1 : 0),
first ? numbers.get(0) : 0, numbers
.get(first ? 2 : 1),
numbers.get(first ? 3 : 2), numbers.get(first ? 4 : 3),
0), new CharStringCommand(8));
}
else
{
addCommand(Arrays.asList(first ? numbers.get(0) : 0, numbers.get(first ? 1 : 0), numbers
.get(first ? 2 : 1), numbers.get(first ? 3 : 2),
0, numbers.get(first ? 4 : 3)),
new CharStringCommand(8));
}
numbers = numbers.subList(first ? 5 : 4, numbers.size());
}
}
private void addCommandList(List> numbers, CharStringCommand command)
{
for (List ns : numbers)
{
addCommand(ns, command);
}
}
private void addCommand(List numbers, CharStringCommand command)
{
type1Sequence.addAll(numbers);
type1Sequence.add(command);
}
private static List> split(List list, int size)
{
List> result = new ArrayList>();
for (int i = 0; i < list.size() / size; i++)
{
result.add(list.subList(i * size, (i + 1) * size));
}
return result;
}
}
