1 /*
2 * Copyright (c) 2003, 2020, 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
42 TrueTypeFont font;
43 CMap cmap;
44 int numGlyphs;
45
46 public TrueTypeGlyphMapper(TrueTypeFont font) {
47 this.font = font;
48 try {
49 cmap = CMap.initialize(font);
50 } catch (Exception e) {
51 cmap = null;
52 }
53 if (cmap == null) {
54 handleBadCMAP();
55 }
56 missingGlyph = 0; /* standard for TrueType fonts */
57 ByteBuffer buffer = font.getTableBuffer(TrueTypeFont.maxpTag);
58 if (buffer != null && buffer.capacity() >= 6) {
59 numGlyphs = buffer.getChar(4); // offset 4 bytes in MAXP table.
60 } else {
61 handleBadCMAP();
62 }
63 }
64
65 public int getNumGlyphs() {
66 return numGlyphs;
67 }
68
69 private char getGlyphFromCMAP(int charCode) {
70 try {
71 char glyphCode = cmap.getGlyph(charCode);
72 if (glyphCode < numGlyphs ||
73 glyphCode >= FileFontStrike.INVISIBLE_GLYPHS) {
74 return glyphCode;
75 } else {
76 if (FontUtilities.isLogging()) {
77 FontUtilities.logWarning(font + " out of range glyph id=" +
78 Integer.toHexString((int)glyphCode) +
79 " for char " + Integer.toHexString(charCode));
80 }
81 return (char)missingGlyph;
82 }
83 } catch(Exception e) {
84 handleBadCMAP();
85 return (char) missingGlyph;
86 }
87 }
88
89 private char getGlyphFromCMAP(int charCode, int variationSelector) {
90 if (variationSelector == 0) {
91 return getGlyphFromCMAP(charCode);
92 }
93 try {
94 char glyphCode = cmap.getVariationGlyph(charCode,
95 variationSelector);
96 if (glyphCode < numGlyphs ||
97 glyphCode >= FileFontStrike.INVISIBLE_GLYPHS) {
98 return glyphCode;
99 } else {
100 if (FontUtilities.isLogging()) {
101 FontUtilities.logWarning(font + " out of range glyph id=" +
102 Integer.toHexString((int)glyphCode) +
103 " for char " + Integer.toHexString(charCode) +
104 " for vs " + Integer.toHexString(variationSelector));
105 }
106 return (char)missingGlyph;
107 }
108 } catch (Exception e) {
109 handleBadCMAP();
110 return (char) missingGlyph;
111 }
112 }
113
114 private void handleBadCMAP() {
115 if (FontUtilities.isLogging()) {
116 FontUtilities.logSevere("Null Cmap for " + font +
117 "substituting for this font");
118 }
119
120 SunFontManager.getInstance().deRegisterBadFont(font);
121 /* The next line is not really a solution, but might
122 * reduce the exceptions until references to this font2D
123 * are gone.
124 */
125 cmap = CMap.theNullCmap;
126 }
127
128 private char remapJAChar(char unicode) {
129 return (unicode == REVERSE_SOLIDUS) ? JA_YEN : unicode;
130 }
131
132 private int remapJAIntChar(int unicode) {
133 return (unicode == REVERSE_SOLIDUS) ? JA_YEN : unicode;
134 }
135
136 public int charToGlyph(char unicode) {
137 int glyph = getGlyphFromCMAP(unicode);
138 return glyph;
139 }
140
141 public int charToGlyph(int unicode) {
142 int glyph = getGlyphFromCMAP(unicode);
143 return glyph;
144 }
145
146 @Override
147 public int charToVariationGlyph(int unicode, int variationSelector) {
148 int glyph = getGlyphFromCMAP(unicode, variationSelector);
149 return glyph;
150 }
151
152 public void charsToGlyphs(int count, int[] unicodes, int[] glyphs) {
153 for (int i=0;i<count;i++) {
154 glyphs[i] = getGlyphFromCMAP(unicodes[i]);
155 }
156 }
157
158 public void charsToGlyphs(int count, char[] unicodes, int[] glyphs) {
159
160 for (int i=0; i<count; i++) {
161 int code = unicodes[i]; // char is unsigned.
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 }
181 }
182
183 /* This variant checks if shaping is needed and immediately
184 * returns true if it does. A caller of this method should be expecting
185 * to check the return type because it needs to know how to handle
186 * the character data for display.
187 */
188 public boolean charsToGlyphsNS(int count, char[] unicodes, int[] glyphs) {
189
190 for (int i=0; i<count; i++) {
191 int code = unicodes[i]; // char is unsigned.
192
193 if (code >= HI_SURROGATE_START &&
194 code <= HI_SURROGATE_END && i < count - 1) {
195 char low = unicodes[i + 1];
196
197 if (low >= LO_SURROGATE_START &&
198 low <= LO_SURROGATE_END) {
199 code = (code - HI_SURROGATE_START) *
200 0x400 + low - LO_SURROGATE_START + 0x10000;
201 glyphs[i + 1] = INVISIBLE_GLYPH_ID;
202 }
203 }
204
205 glyphs[i] = getGlyphFromCMAP(code);
206
207 if (code < FontUtilities.MIN_LAYOUT_CHARCODE) {
208 continue;
209 }
210 else if (FontUtilities.isComplexCharCode(code) ||
211 CharToGlyphMapper.isVariationSelector(code)) {
212 return true;
213 }
214 else if (code >= 0x10000) {
215 i += 1; // Empty glyph slot after surrogate
216 continue;
217 }
218 }
219
220 return false;
221 }
222
223 /* A pretty good heuristic is that the cmap we are using
224 * supports 32 bit character codes.
225 */
226 boolean hasSupplementaryChars() {
227 return
228 cmap instanceof CMap.CMapFormat8 ||
229 cmap instanceof CMap.CMapFormat10 ||
230 cmap instanceof CMap.CMapFormat12;
231 }
232 }