1 /*
2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.font;
27
28 import java.nio.ByteBuffer;
29 import java.util.Locale;
30
31 public class TrueTypeGlyphMapper extends CharToGlyphMapper {
32
33 static final char REVERSE_SOLIDUS = 0x005c; // the backslash char.
34 static final char JA_YEN = 0x00a5;
35
36 /* if running on Solaris and default Locale is ja_JP then
37 * we map need to remap reverse solidus (backslash) to Yen as
38 * apparently expected there.
39 */
40 static final boolean isJAlocale = Locale.JAPAN.equals(Locale.getDefault());
41 private final boolean needsJAremapping;
42
43 TrueTypeFont font;
44 CMap cmap;
45 int numGlyphs;
46
47 public TrueTypeGlyphMapper(TrueTypeFont font) {
48 this.font = font;
49 try {
50 cmap = CMap.initialize(font);
51 } catch (Exception e) {
52 cmap = null;
53 }
54 if (cmap == null) {
55 handleBadCMAP();
56 }
57 missingGlyph = 0; /* standard for TrueType fonts */
58 ByteBuffer buffer = font.getTableBuffer(TrueTypeFont.maxpTag);
59 if (buffer != null && buffer.capacity() >= 6) {
60 numGlyphs = buffer.getChar(4); // offset 4 bytes in MAXP table.
61 } else {
62 handleBadCMAP();
63 }
64 if (FontUtilities.isSolaris && isJAlocale && font.supportsJA()) {
65 needsJAremapping = true;
66 } else {
67 needsJAremapping = false;
68 }
69 }
70
71 public int getNumGlyphs() {
72 return numGlyphs;
73 }
74
75 private char getGlyphFromCMAP(int charCode) {
76 try {
77 char glyphCode = cmap.getGlyph(charCode);
78 if (glyphCode < numGlyphs ||
79 glyphCode >= FileFontStrike.INVISIBLE_GLYPHS) {
80 return glyphCode;
81 } else {
82 if (FontUtilities.isLogging()) {
83 FontUtilities.getLogger().warning
84 (font + " out of range glyph id=" +
85 Integer.toHexString((int)glyphCode) +
86 " for char " + Integer.toHexString(charCode));
87 }
88 return (char)missingGlyph;
89 }
90 } catch(Exception e) {
91 handleBadCMAP();
92 return (char) missingGlyph;
93 }
94 }
95
96 private void handleBadCMAP() {
97 if (FontUtilities.isLogging()) {
98 FontUtilities.getLogger().severe("Null Cmap for " + font +
99 "substituting for this font");
100 }
101 SunFontManager.getInstance().deRegisterBadFont(font);
102 /* The next line is not really a solution, but might
103 * reduce the exceptions until references to this font2D
104 * are gone.
105 */
106 cmap = CMap.theNullCmap;
107 }
108
109 private char remapJAChar(char unicode) {
110 return (unicode == REVERSE_SOLIDUS) ? JA_YEN : unicode;
111 }
112
113 private int remapJAIntChar(int unicode) {
114 return (unicode == REVERSE_SOLIDUS) ? JA_YEN : unicode;
115 }
116
117 public int charToGlyph(char unicode) {
118 if (needsJAremapping) {
119 unicode = remapJAChar(unicode);
120 }
121 int glyph = getGlyphFromCMAP(unicode);
122 if (font.checkUseNatives() && glyph < font.glyphToCharMap.length) {
123 font.glyphToCharMap[glyph] = unicode;
124 }
125 return glyph;
126 }
127
128 public int charToGlyph(int unicode) {
129 if (needsJAremapping) {
130 unicode = remapJAIntChar(unicode);
131 }
132 int glyph = getGlyphFromCMAP(unicode);
133 if (font.checkUseNatives() && glyph < font.glyphToCharMap.length) {
134 font.glyphToCharMap[glyph] = (char)unicode;
135 }
136 return glyph;
137 }
138
139 public void charsToGlyphs(int count, int[] unicodes, int[] glyphs) {
140 for (int i=0;i<count;i++) {
141 if (needsJAremapping) {
142 glyphs[i] = getGlyphFromCMAP(remapJAIntChar(unicodes[i]));
143 } else {
144 glyphs[i] = getGlyphFromCMAP(unicodes[i]);
145 }
146 if (font.checkUseNatives() &&
147 glyphs[i] < font.glyphToCharMap.length) {
148 font.glyphToCharMap[glyphs[i]] = (char)unicodes[i];
149 }
150 }
151 }
152
153 public void charsToGlyphs(int count, char[] unicodes, int[] glyphs) {
154
155 for (int i=0; i<count; i++) {
156 int code;
157 if (needsJAremapping) {
158 code = remapJAChar(unicodes[i]);
159 } else {
160 code = unicodes[i]; // char is unsigned.
161 }
162
163 if (code >= HI_SURROGATE_START &&
164 code <= HI_SURROGATE_END && i < count - 1) {
165 char low = unicodes[i + 1];
166
167 if (low >= LO_SURROGATE_START &&
168 low <= LO_SURROGATE_END) {
169 code = (code - HI_SURROGATE_START) *
170 0x400 + low - LO_SURROGATE_START + 0x10000;
171
172 glyphs[i] = getGlyphFromCMAP(code);
173 i += 1; // Empty glyph slot after surrogate
174 glyphs[i] = INVISIBLE_GLYPH_ID;
175 continue;
176 }
177 }
178 glyphs[i] = getGlyphFromCMAP(code);
179
180 if (font.checkUseNatives() &&
181 glyphs[i] < font.glyphToCharMap.length) {
182 font.glyphToCharMap[glyphs[i]] = (char)code;
183 }
184
185 }
186 }
187
188 /* This variant checks if shaping is needed and immediately
189 * returns true if it does. A caller of this method should be expecting
190 * to check the return type because it needs to know how to handle
191 * the character data for display.
192 */
193 public boolean charsToGlyphsNS(int count, char[] unicodes, int[] glyphs) {
194
195 for (int i=0; i<count; i++) {
196 int code;
197 if (needsJAremapping) {
198 code = remapJAChar(unicodes[i]);
199 } else {
200 code = unicodes[i]; // char is unsigned.
201 }
202
203 if (code >= HI_SURROGATE_START &&
204 code <= HI_SURROGATE_END && i < count - 1) {
205 char low = unicodes[i + 1];
206
207 if (low >= LO_SURROGATE_START &&
208 low <= LO_SURROGATE_END) {
209 code = (code - HI_SURROGATE_START) *
210 0x400 + low - LO_SURROGATE_START + 0x10000;
211 glyphs[i + 1] = INVISIBLE_GLYPH_ID;
212 }
213 }
214
215 glyphs[i] = getGlyphFromCMAP(code);
216 if (font.checkUseNatives() &&
217 glyphs[i] < font.glyphToCharMap.length) {
218 font.glyphToCharMap[glyphs[i]] = (char)code;
219 }
220
221 if (code < FontUtilities.MIN_LAYOUT_CHARCODE) {
222 continue;
223 }
224 else if (FontUtilities.isComplexCharCode(code)) {
225 return true;
226 }
227 else if (code >= 0x10000) {
228 i += 1; // Empty glyph slot after surrogate
229 continue;
230 }
231 }
232
233 return false;
234 }
235
236 /* A pretty good heuristic is that the cmap we are using
237 * supports 32 bit character codes.
238 */
239 boolean hasSupplementaryChars() {
240 return
241 cmap instanceof CMap.CMapFormat8 ||
242 cmap instanceof CMap.CMapFormat10 ||
243 cmap instanceof CMap.CMapFormat12;
244 }
245 }