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