/*
* 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.fonts.truetype;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.assertTrue;
/**
* Tests {@link GlyfTable}.
*/
public class GlyfTableTestCase {
private static final class DirData {
final long offset;
final long length;
DirData(long offset, long length) {
this.offset = offset;
this.length = length;
}
}
private FontFileReader subsetReader;
private long[] glyphOffsets;
private FontFileReader originalFontReader;
@Before
public void setUp() throws IOException {
FileInputStream fontStream = new FileInputStream(
"test/resources/fonts/ttf/DejaVuLGCSerif.ttf");
try {
originalFontReader = new FontFileReader(fontStream);
} finally {
fontStream.close();
}
}
/**
* Tests that composed glyphs are included in the glyph subset if a composite glyph is used.
*
* @throws IOException if an I/O error occurs
*/
@Test
public void testPopulateGlyphsWithComposites() throws IOException {
// Glyph 408 -> U+01D8 "uni01D8" this is a composite glyph.
int[] composedIndices = setupTest(408);
int[] expected = new int[composedIndices.length];
expected[1] = 6;
expected[5] = 2;
expected[6] = 4;
assertArrayEquals(expected, composedIndices);
}
/**
* Tests that no glyphs are added if there are no composite glyphs the subset.
*
* @throws IOException if an I/O error occurs
*/
@Test
public void testPopulateNoCompositeGlyphs() throws IOException {
int[] composedIndices = setupTest(36, 37, 38); // "A", "B", "C"
int[] expected = new int[composedIndices.length];
// There should be NO composite glyphs
assertArrayEquals(expected, composedIndices);
}
/**
* Tests that glyphs aren't remapped twice if the glyph before a composite glyph has 0-length.
*
* @throws IOException if an I/O error occurs
*/
@Test
public void testGlyphsNotRemappedTwice() throws IOException {
int composedGlyph = 12;
// The order of these glyph indices, must NOT be changed! (see javadoc above)
int[] composedIndices = setupTest(1, 2, 3, 16, 2014, 4, 7, 8, 13, 2015, composedGlyph);
// There are 2 composed glyphs within the subset
int[] expected = new int[composedIndices.length];
expected[10] = composedGlyph;
assertArrayEquals(expected, composedIndices);
}
/**
* Tests that the correct glyph is included in the subset, when a composite glyph composed of a
* composite glyph is used.
*
* @throws IOException if an I/O error occurs
*/
@Test
public void testSingleRecursionStep() throws IOException {
// Glyph 2077 -> U+283F "uni283F" this is composed of a composite glyph (recursive).
int[] composedIndices = setupTest(2077);
int[] expected = new int[composedIndices.length];
expected[1] = 2;
assertArrayEquals(expected, composedIndices);
}
private int[] setupTest(int... glyphIndices) throws IOException {
Map<Integer, Integer> glyphs = new HashMap<Integer, Integer>();
int index = 0;
glyphs.put(0, index++); // Glyph 0 (.notdef) must ALWAYS be in the subset
for (int glyphIndex : glyphIndices) {
glyphs.put(glyphIndex, index++);
}
setupSubsetReader(glyphs);
readLoca();
return retrieveIndicesOfComposedGlyphs();
}
private void setupSubsetReader(Map<Integer, Integer> glyphs) throws IOException {
TTFSubSetFile fontFile = new TTFSubSetFile();
String header = OFFontLoader.readHeader(subsetReader);
fontFile.readFont(originalFontReader, "Deja", header, glyphs);
byte[] subsetFont = fontFile.getFontSubset();
InputStream intputStream = new ByteArrayInputStream(subsetFont);
subsetReader = new FontFileReader(intputStream);
}
private void readLoca() throws IOException {
DirData loca = getTableData(OFTableName.LOCA.getName());
int numberOfGlyphs = (int) (loca.length - 4) / 4;
glyphOffsets = new long[numberOfGlyphs];
subsetReader.seekSet(loca.offset);
for (int i = 0; i < numberOfGlyphs; i++) {
glyphOffsets[i] = subsetReader.readTTFULong();
}
}
private int[] retrieveIndicesOfComposedGlyphs() throws IOException {
DirData glyf = getTableData(OFTableName.GLYF.getName());
int[] composedGlyphIndices = new int[glyphOffsets.length];
for (int i = 0; i < glyphOffsets.length; i++) {
long glyphOffset = glyphOffsets[i];
if (i != glyphOffsets.length - 1 && glyphOffset == glyphOffsets[i + 1]) {
continue;
}
subsetReader.seekSet(glyf.offset + glyphOffset);
short numberOfContours = subsetReader.readTTFShort();
if (numberOfContours < 0) {
subsetReader.skip(8);
subsetReader.readTTFUShort(); // flags
int glyphIndex = subsetReader.readTTFUShort();
composedGlyphIndices[i] = glyphIndex;
}
}
return composedGlyphIndices;
}
private DirData getTableData(String tableName) throws IOException {
subsetReader.seekSet(0);
subsetReader.skip(12);
String name;
do {
name = subsetReader.readTTFString(4);
subsetReader.skip(4 * 3);
} while (!name.equals(tableName));
subsetReader.skip(-8); // We've found the table, go back to get the data we skipped over
return new DirData(subsetReader.readTTFLong(), subsetReader.readTTFLong());
}
private void assertArrayEquals(int[] expected, int[] actual) {
assertTrue(Arrays.equals(expected, actual));
}
}