1/*
2 * Copyright (c) 2010, Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32#include "FontTranscoder.h"
33
34#include "FontDescription.h"
35#include "TextEncoding.h"
36#include <wtf/unicode/CharacterNames.h>
37
38namespace WebCore {
39
40FontTranscoder::FontTranscoder()
41{
42    m_converterTypes.add("MS PGothic", BackslashToYenSign);
43    UChar unicodeNameMSPGothic[] = {0xFF2D, 0xFF33, 0x0020, 0xFF30, 0x30B4, 0x30B7, 0x30C3, 0x30AF};
44    m_converterTypes.add(AtomicString(unicodeNameMSPGothic, WTF_ARRAY_LENGTH(unicodeNameMSPGothic)), BackslashToYenSign);
45
46    m_converterTypes.add("MS PMincho", BackslashToYenSign);
47    UChar unicodeNameMSPMincho[] = {0xFF2D, 0xFF33, 0x0020, 0xFF30, 0x660E, 0x671D};
48    m_converterTypes.add(AtomicString(unicodeNameMSPMincho, WTF_ARRAY_LENGTH(unicodeNameMSPMincho)), BackslashToYenSign);
49
50    m_converterTypes.add("MS Gothic", BackslashToYenSign);
51    UChar unicodeNameMSGothic[] = {0xFF2D, 0xFF33, 0x0020, 0x30B4, 0x30B7, 0x30C3, 0x30AF};
52    m_converterTypes.add(AtomicString(unicodeNameMSGothic, WTF_ARRAY_LENGTH(unicodeNameMSGothic)), BackslashToYenSign);
53
54    m_converterTypes.add("MS Mincho", BackslashToYenSign);
55    UChar unicodeNameMSMincho[] = {0xFF2D, 0xFF33, 0x0020, 0x660E, 0x671D};
56    m_converterTypes.add(AtomicString(unicodeNameMSMincho, WTF_ARRAY_LENGTH(unicodeNameMSMincho)), BackslashToYenSign);
57
58    m_converterTypes.add("Meiryo", BackslashToYenSign);
59    UChar unicodeNameMeiryo[] = {0x30E1, 0x30A4, 0x30EA, 0x30AA};
60    m_converterTypes.add(AtomicString(unicodeNameMeiryo, WTF_ARRAY_LENGTH(unicodeNameMeiryo)), BackslashToYenSign);
61}
62
63FontTranscoder::ConverterType FontTranscoder::converterType(const FontDescription& fontDescription, const TextEncoding* encoding) const
64{
65    const AtomicString& fontFamily = fontDescription.family().family().string();
66    if (!fontFamily.isNull()) {
67        HashMap<AtomicString, ConverterType>::const_iterator found = m_converterTypes.find(fontFamily);
68        if (found != m_converterTypes.end())
69            return found->second;
70    }
71
72    // IE's default fonts for Japanese encodings change backslashes into yen signs.
73    // We emulate this behavior only when no font is explicitly specified.
74    if (encoding && encoding->backslashAsCurrencySymbol() != '\\' && !fontDescription.isSpecifiedFont())
75        return BackslashToYenSign;
76
77    return NoConversion;
78}
79
80void FontTranscoder::convert(String& text, const FontDescription& fontDescription, const TextEncoding* encoding) const
81{
82    switch (converterType(fontDescription, encoding)) {
83    case BackslashToYenSign: {
84        // FIXME: TextEncoding.h has similar code. We need to factor them out.
85        text.replace('\\', yenSign);
86        break;
87    }
88    case NoConversion:
89    default:
90        ASSERT_NOT_REACHED();
91    }
92}
93
94bool FontTranscoder::needsTranscoding(const FontDescription& fontDescription, const TextEncoding* encoding) const
95{
96    ConverterType type = converterType(fontDescription, encoding);
97    return type != NoConversion;
98}
99
100FontTranscoder& fontTranscoder()
101{
102    static FontTranscoder* transcoder = new FontTranscoder;
103    return *transcoder;
104}
105
106} // namespace WebCore
107