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.getLogger().warning
78 (font + " out of range glyph id=" +
79 Integer.toHexString((int)glyphCode) +
80 " for char " + Integer.toHexString(charCode));
81 }
82 return (char)missingGlyph;
83 }
84 } catch(Exception e) {
85 handleBadCMAP();
86 return (char) missingGlyph;
87 }
88 }
89
90 private char getGlyphFromCMAP(int charCode, int variationSelector) {
91 if (variationSelector == 0) {
92 return getGlyphFromCMAP(charCode);
93 }
94 try {
95 char glyphCode = cmap.getVariationGlyph(charCode,
96 variationSelector);
97 if (glyphCode < numGlyphs ||
98 glyphCode >= FileFontStrike.INVISIBLE_GLYPHS) {
99 return glyphCode;
100 } else {
101 if (FontUtilities.isLogging()) {
102 FontUtilities.getLogger().warning
103 (font + " out of range glyph id=" +
104 Integer.toHexString((int)glyphCode) +
105 " for char " + Integer.toHexString(charCode) +
106 " for vs " + Integer.toHexString(variationSelector));
107 }
108 return (char)missingGlyph;
109 }
110 } catch (Exception e) {
111 handleBadCMAP();
112 return (char) missingGlyph;
113 }
114 }
115
116 private void handleBadCMAP() {
117 if (FontUtilities.isLogging()) {
118 FontUtilities.getLogger().severe("Null Cmap for " + font +
119 "substituting for this font");
120 }
121 SunFontManager.getInstance().deRegisterBadFont(font);
122 /* The next line is not really a solution, but might
123 * reduce the exceptions until references to this font2D
124 * are gone.
125 */
126 cmap = CMap.theNullCmap;
127 }
128
129 private char remapJAChar(char unicode) {
130 return (unicode == REVERSE_SOLIDUS) ? JA_YEN : unicode;
131 }
132
133 private int remapJAIntChar(int unicode) {
134 return (unicode == REVERSE_SOLIDUS) ? JA_YEN : unicode;
135 }
136
137 public int charToGlyph(char unicode) {
138 int glyph = getGlyphFromCMAP(unicode);
139 return glyph;
140 }
141
142 public int charToGlyph(int unicode) {
143 int glyph = getGlyphFromCMAP(unicode);
144 return glyph;
145 }
146
147 @Override
148 public int charToVariationGlyph(int unicode, int variationSelector) {
149 int glyph = getGlyphFromCMAP(unicode, variationSelector);
150 return glyph;
151 }
152
153 public void charsToGlyphs(int count, int[] unicodes, int[] glyphs) {
154 for (int i=0;i<count;i++) {
155 glyphs[i] = getGlyphFromCMAP(unicodes[i]);
156 }
157 }
158
159 public void charsToGlyphs(int count, char[] unicodes, int[] glyphs) {
160
161 for (int i=0; i<count; i++) {
162 int code = unicodes[i]; // char is unsigned.
163
164 if (code >= HI_SURROGATE_START &&
165 code <= HI_SURROGATE_END && i < count - 1) {
166 char low = unicodes[i + 1];
167
168 if (low >= LO_SURROGATE_START &&
169 low <= LO_SURROGATE_END) {
170 code = (code - HI_SURROGATE_START) *
171 0x400 + low - LO_SURROGATE_START + 0x10000;
172
173 glyphs[i] = getGlyphFromCMAP(code);
174 i += 1; // Empty glyph slot after surrogate
175 glyphs[i] = INVISIBLE_GLYPH_ID;
176 continue;
177 }
178 }
179 glyphs[i] = getGlyphFromCMAP(code);
180
181 }
182 }
183
184 /* This variant checks if shaping is needed and immediately
185 * returns true if it does. A caller of this method should be expecting
186 * to check the return type because it needs to know how to handle
187 * the character data for display.
188 */
189 public boolean charsToGlyphsNS(int count, char[] unicodes, int[] glyphs) {
190
191 for (int i=0; i<count; i++) {
192 int code = unicodes[i]; // char is unsigned.
193
194 if (code >= HI_SURROGATE_START &&
195 code <= HI_SURROGATE_END && i < count - 1) {
196 char low = unicodes[i + 1];
197
198 if (low >= LO_SURROGATE_START &&
199 low <= LO_SURROGATE_END) {
200 code = (code - HI_SURROGATE_START) *
201 0x400 + low - LO_SURROGATE_START + 0x10000;
202 glyphs[i + 1] = INVISIBLE_GLYPH_ID;
203 }
204 }
205
206 glyphs[i] = getGlyphFromCMAP(code);
207
208 if (code < FontUtilities.MIN_LAYOUT_CHARCODE) {
209 continue;
210 }
211 else if (FontUtilities.isComplexCharCode(code) ||
212 CharToGlyphMapper.isVariationSelector(code)) {
213 return true;
214 }
215 else if (code >= 0x10000) {
216 i += 1; // Empty glyph slot after surrogate
217 continue;
218 }
219 }
220
221 return false;
222 }
223
224 /* A pretty good heuristic is that the cmap we are using
225 * supports 32 bit character codes.
226 */
227 boolean hasSupplementaryChars() {
228 return
229 cmap instanceof CMap.CMapFormat8 ||
230 cmap instanceof CMap.CMapFormat10 ||
231 cmap instanceof CMap.CMapFormat12;
232 }
233 }