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| 1 | +/* | |
| 2 | + * Copyright (c) 1999, 2008, 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 | + | |
| 27 | +/* | |
| 28 | + * (C) Copyright IBM Corp. 1999, All rights reserved. | |
| 29 | + */ | |
| 30 | + | |
| 31 | +package sun.font; | |
| 32 | + | |
| 33 | +import java.awt.Font; | |
| 34 | +import java.awt.GraphicsEnvironment; | |
| 35 | +import java.awt.font.TextAttribute; | |
| 36 | +import java.util.ArrayList; | |
| 37 | +import java.util.Map; | |
| 38 | +import sun.text.CodePointIterator; | |
| 39 | + | |
| 40 | +/** | |
| 41 | + * This class maps an individual character to a Font family which can | |
| 42 | + * display it. The character-to-Font mapping does not depend on the | |
| 43 | + * character's context, so a particular character will be mapped to the | |
| 44 | + * same font family each time. | |
| 45 | + * <p> | |
| 46 | + * Typically, clients will call getIndexFor(char) for each character | |
| 47 | + * in a style run. When getIndexFor() returns a different value from | |
| 48 | + * ones seen previously, the characters up to that point will be assigned | |
| 49 | + * a font obtained from getFont(). | |
| 50 | + */ | |
| 51 | +public final class FontResolver { | |
| 52 | + | |
| 53 | + // An array of all fonts available to the runtime. The fonts | |
| 54 | + // will be searched in order. | |
| 55 | + private Font[] allFonts; | |
| 56 | + private Font[] supplementaryFonts; | |
| 57 | + private int[] supplementaryIndices; | |
| 58 | + | |
| 59 | + // Default size of Fonts (if created from an empty Map, for instance). | |
| 60 | + private static final int DEFAULT_SIZE = 12; // from Font | |
| 61 | + | |
| 62 | + private Font defaultFont = new Font(Font.DIALOG, Font.PLAIN, DEFAULT_SIZE); | |
| 63 | + | |
| 64 | + // The results of previous lookups are cached in a two-level | |
| 65 | + // table. The value for a character c is found in: | |
| 66 | + // blocks[c>>SHIFT][c&MASK] | |
| 67 | + // although the second array is only allocated when needed. | |
| 68 | + // A 0 value means the character's font has not been looked up. | |
| 69 | + // A positive value means the character's font is in the allFonts | |
| 70 | + // array at index (value-1). | |
| 71 | + private static final int SHIFT = 9; | |
| 72 | + private static final int BLOCKSIZE = 1<<(16-SHIFT); | |
| 73 | + private static final int MASK = BLOCKSIZE-1; | |
| 74 | + private int[][] blocks = new int[1<<SHIFT][]; | |
| 75 | + | |
| 76 | + private FontResolver() { | |
| 77 | + } | |
| 78 | + | |
| 79 | + private Font[] getAllFonts() { | |
| 80 | + if (allFonts == null) { | |
| 81 | + allFonts = | |
| 82 | + GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts(); | |
| 83 | + for (int i=0; i < allFonts.length; i++) { | |
| 84 | + allFonts[i] = allFonts[i].deriveFont((float)DEFAULT_SIZE); | |
| 85 | + } | |
| 86 | + } | |
| 87 | + return allFonts; | |
| 88 | + } | |
| 89 | + | |
| 90 | + /** | |
| 91 | + * Search fonts in order, and return "1" to indicate its in the default | |
| 92 | + * font, (or not found at all), or the index of the first font | |
| 93 | + * which can display the given character, plus 2, if it is not | |
| 94 | + * in the default font. | |
| 95 | + */ | |
| 96 | + private int getIndexFor(char c) { | |
| 97 | + | |
| 98 | + if (defaultFont.canDisplay(c)) { | |
| 99 | + return 1; | |
| 100 | + } | |
| 101 | + for (int i=0; i < getAllFonts().length; i++) { | |
| 102 | + if (allFonts[i].canDisplay(c)) { | |
| 103 | + return i+2; | |
| 104 | + } | |
| 105 | + } | |
| 106 | + return 1; | |
| 107 | + } | |
| 108 | + | |
| 109 | + private Font [] getAllSCFonts() { | |
| 110 | + | |
| 111 | + if (supplementaryFonts == null) { | |
| 112 | + ArrayList<Font> fonts = new ArrayList<Font>(); | |
| 113 | + ArrayList<Integer> indices = new ArrayList<Integer>(); | |
| 114 | + | |
| 115 | + for (int i=0; i<getAllFonts().length; i++) { | |
| 116 | + Font font = allFonts[i]; | |
| 117 | + Font2D font2D = FontUtilities.getFont2D(font); | |
| 118 | + if (font2D.hasSupplementaryChars()) { | |
| 119 | + fonts.add(font); | |
| 120 | + indices.add(Integer.valueOf(i)); | |
| 121 | + } | |
| 122 | + } | |
| 123 | + | |
| 124 | + int len = fonts.size(); | |
| 125 | + supplementaryIndices = new int[len]; | |
| 126 | + for (int i=0; i<len; i++) { | |
| 127 | + supplementaryIndices[i] = indices.get(i); | |
| 128 | + } | |
| 129 | + supplementaryFonts = fonts.toArray(new Font[len]); | |
| 130 | + } | |
| 131 | + return supplementaryFonts; | |
| 132 | + } | |
| 133 | + | |
| 134 | + /* This method is called only for character codes >= 0x10000 - which | |
| 135 | + * are assumed to be legal supplementary characters. | |
| 136 | + * It looks first at the default font (to avoid calling getAllFonts if at | |
| 137 | + * all possible) and if that doesn't map the code point, it scans | |
| 138 | + * just the fonts that may contain supplementary characters. | |
| 139 | + * The index that is returned is into the "allFonts" array so that | |
| 140 | + * callers see the same value for both supplementary and base chars. | |
| 141 | + */ | |
| 142 | + private int getIndexFor(int cp) { | |
| 143 | + | |
| 144 | + if (defaultFont.canDisplay(cp)) { | |
| 145 | + return 1; | |
| 146 | + } | |
| 147 | + | |
| 148 | + for (int i = 0; i < getAllSCFonts().length; i++) { | |
| 149 | + if (supplementaryFonts[i].canDisplay(cp)) { | |
| 150 | + return supplementaryIndices[i]+2; | |
| 151 | + } | |
| 152 | + } | |
| 153 | + return 1; | |
| 154 | + } | |
| 155 | + | |
| 156 | + /** | |
| 157 | + * Return an index for the given character. The index identifies a | |
| 158 | + * font family to getFont(), and has no other inherent meaning. | |
| 159 | + * @param c the character to map | |
| 160 | + * @return a value for consumption by getFont() | |
| 161 | + * @see #getFont | |
| 162 | + */ | |
| 163 | + public int getFontIndex(char c) { | |
| 164 | + | |
| 165 | + int blockIndex = c>>SHIFT; | |
| 166 | + int[] block = blocks[blockIndex]; | |
| 167 | + if (block == null) { | |
| 168 | + block = new int[BLOCKSIZE]; | |
| 169 | + blocks[blockIndex] = block; | |
| 170 | + } | |
| 171 | + | |
| 172 | + int index = c & MASK; | |
| 173 | + if (block[index] == 0) { | |
| 174 | + block[index] = getIndexFor(c); | |
| 175 | + } | |
| 176 | + return block[index]; | |
| 177 | + } | |
| 178 | + | |
| 179 | + public int getFontIndex(int cp) { | |
| 180 | + if (cp < 0x10000) { | |
| 181 | + return getFontIndex((char)cp); | |
| 182 | + } | |
| 183 | + return getIndexFor(cp); | |
| 184 | + } | |
| 185 | + | |
| 186 | + /** | |
| 187 | + * Determines the font index for the code point at the current position in the | |
| 188 | + * iterator, then advances the iterator to the first code point that has | |
| 189 | + * a different index or until the iterator is DONE, and returns the font index. | |
| 190 | + * @param iter a code point iterator, this will be advanced past any code | |
| 191 | + * points that have the same font index | |
| 192 | + * @return the font index for the initial code point found, or 1 if the iterator | |
| 193 | + * was empty. | |
| 194 | + */ | |
| 195 | + public int nextFontRunIndex(CodePointIterator iter) { | |
| 196 | + int cp = iter.next(); | |
| 197 | + int fontIndex = 1; | |
| 198 | + if (cp != CodePointIterator.DONE) { | |
| 199 | + fontIndex = getFontIndex(cp); | |
| 200 | + | |
| 201 | + while ((cp = iter.next()) != CodePointIterator.DONE) { | |
| 202 | + if (getFontIndex(cp) != fontIndex) { | |
| 203 | + iter.prev(); | |
| 204 | + break; | |
| 205 | + } | |
| 206 | + } | |
| 207 | + } | |
| 208 | + return fontIndex; | |
| 209 | + } | |
| 210 | + | |
| 211 | + /** | |
| 212 | + * Return a Font from a given font index with properties | |
| 213 | + * from attributes. The font index, which should have been produced | |
| 214 | + * by getFontIndex(), determines a font family. The size and style | |
| 215 | + * of the Font reflect the properties in attributes. Any Font or | |
| 216 | + * font family specifications in attributes are ignored, on the | |
| 217 | + * assumption that clients have already handled them. | |
| 218 | + * @param index an index from getFontIndex() which determines the | |
| 219 | + * font family | |
| 220 | + * @param attributes a Map from which the size and style of the Font | |
| 221 | + * are determined. The default size is 12 and the default style | |
| 222 | + * is Font.PLAIN | |
| 223 | + * @see #getFontIndex | |
| 224 | + */ | |
| 225 | + public Font getFont(int index, Map attributes) { | |
| 226 | + Font font = defaultFont; | |
| 227 | + | |
| 228 | + if (index >= 2) { | |
| 229 | + font = allFonts[index-2]; | |
| 230 | + } | |
| 231 | + | |
| 232 | + return font.deriveFont(attributes); | |
| 233 | + } | |
| 234 | + | |
| 235 | + private static FontResolver INSTANCE; | |
| 236 | + | |
| 237 | + /** | |
| 238 | + * Return a shared instance of FontResolver. | |
| 239 | + */ | |
| 240 | + public static FontResolver getInstance() { | |
| 241 | + if (INSTANCE == null) { | |
| 242 | + INSTANCE = new FontResolver(); | |
| 243 | + } | |
| 244 | + return INSTANCE; | |
| 245 | + } | |
| 246 | +} | |