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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 | } | ||