--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/font/FontResolver.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,246 @@
+/*
+ * Portions Copyright 1999-2005 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+/*
+ * (C) Copyright IBM Corp. 1999, All rights reserved.
+ */
+
+package sun.font;
+
+import java.awt.Font;
+import java.awt.GraphicsEnvironment;
+import java.awt.font.TextAttribute;
+import java.util.ArrayList;
+import java.util.Map;
+import sun.text.CodePointIterator;
+
+/**
+ * This class maps an individual character to a Font family which can
+ * display it. The character-to-Font mapping does not depend on the
+ * character's context, so a particular character will be mapped to the
+ * same font family each time.
+ * <p>
+ * Typically, clients will call getIndexFor(char) for each character
+ * in a style run. When getIndexFor() returns a different value from
+ * ones seen previously, the characters up to that point will be assigned
+ * a font obtained from getFont().
+ */
+public final class FontResolver {
+
+ // An array of all fonts available to the runtime. The fonts
+ // will be searched in order.
+ private Font[] allFonts;
+ private Font[] supplementaryFonts;
+ private int[] supplementaryIndices;
+
+ // Default size of Fonts (if created from an empty Map, for instance).
+ private static final int DEFAULT_SIZE = 12; // from Font
+
+ private Font defaultFont = new Font(Font.DIALOG, Font.PLAIN, DEFAULT_SIZE);
+
+ // The results of previous lookups are cached in a two-level
+ // table. The value for a character c is found in:
+ // blocks[c>>SHIFT][c&MASK]
+ // although the second array is only allocated when needed.
+ // A 0 value means the character's font has not been looked up.
+ // A positive value means the character's font is in the allFonts
+ // array at index (value-1).
+ private static final int SHIFT = 9;
+ private static final int BLOCKSIZE = 1<<(16-SHIFT);
+ private static final int MASK = BLOCKSIZE-1;
+ private int[][] blocks = new int[1<<SHIFT][];
+
+ private FontResolver() {
+ }
+
+ private Font[] getAllFonts() {
+ if (allFonts == null) {
+ allFonts =
+ GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();
+ for (int i=0; i < allFonts.length; i++) {
+ allFonts[i] = allFonts[i].deriveFont((float)DEFAULT_SIZE);
+ }
+ }
+ return allFonts;
+ }
+
+ /**
+ * Search fonts in order, and return "1" to indicate its in the default
+ * font, (or not found at all), or the index of the first font
+ * which can display the given character, plus 2, if it is not
+ * in the default font.
+ */
+ private int getIndexFor(char c) {
+
+ if (defaultFont.canDisplay(c)) {
+ return 1;
+ }
+ for (int i=0; i < getAllFonts().length; i++) {
+ if (allFonts[i].canDisplay(c)) {
+ return i+2;
+ }
+ }
+ return 1;
+ }
+
+ private Font [] getAllSCFonts() {
+
+ if (supplementaryFonts == null) {
+ ArrayList<Font> fonts = new ArrayList<Font>();
+ ArrayList<Integer> indices = new ArrayList<Integer>();
+
+ for (int i=0; i<getAllFonts().length; i++) {
+ Font font = allFonts[i];
+ Font2D font2D = FontManager.getFont2D(font);
+ if (font2D.hasSupplementaryChars()) {
+ fonts.add(font);
+ indices.add(new Integer(i));
+ }
+ }
+
+ int len = fonts.size();
+ supplementaryIndices = new int[len];
+ for (int i=0; i<len; i++) {
+ supplementaryIndices[i] = indices.get(i);
+ }
+ supplementaryFonts = fonts.toArray(new Font[len]);
+ }
+ return supplementaryFonts;
+ }
+
+ /* This method is called only for character codes >= 0x10000 - which
+ * are assumed to be legal supplementary characters.
+ * It looks first at the default font (to avoid calling getAllFonts if at
+ * all possible) and if that doesn't map the code point, it scans
+ * just the fonts that may contain supplementary characters.
+ * The index that is returned is into the "allFonts" array so that
+ * callers see the same value for both supplementary and base chars.
+ */
+ private int getIndexFor(int cp) {
+
+ if (defaultFont.canDisplay(cp)) {
+ return 1;
+ }
+
+ for (int i = 0; i < getAllSCFonts().length; i++) {
+ if (supplementaryFonts[i].canDisplay(cp)) {
+ return supplementaryIndices[i]+2;
+ }
+ }
+ return 1;
+ }
+
+ /**
+ * Return an index for the given character. The index identifies a
+ * font family to getFont(), and has no other inherent meaning.
+ * @param c the character to map
+ * @return a value for consumption by getFont()
+ * @see #getFont
+ */
+ public int getFontIndex(char c) {
+
+ int blockIndex = c>>SHIFT;
+ int[] block = blocks[blockIndex];
+ if (block == null) {
+ block = new int[BLOCKSIZE];
+ blocks[blockIndex] = block;
+ }
+
+ int index = c & MASK;
+ if (block[index] == 0) {
+ block[index] = getIndexFor(c);
+ }
+ return block[index];
+ }
+
+ public int getFontIndex(int cp) {
+ if (cp < 0x10000) {
+ return getFontIndex((char)cp);
+ }
+ return getIndexFor(cp);
+ }
+
+ /**
+ * Determines the font index for the code point at the current position in the
+ * iterator, then advances the iterator to the first code point that has
+ * a different index or until the iterator is DONE, and returns the font index.
+ * @param iter a code point iterator, this will be advanced past any code
+ * points that have the same font index
+ * @return the font index for the initial code point found, or 1 if the iterator
+ * was empty.
+ */
+ public int nextFontRunIndex(CodePointIterator iter) {
+ int cp = iter.next();
+ int fontIndex = 1;
+ if (cp != CodePointIterator.DONE) {
+ fontIndex = getFontIndex(cp);
+
+ while ((cp = iter.next()) != CodePointIterator.DONE) {
+ if (getFontIndex(cp) != fontIndex) {
+ iter.prev();
+ break;
+ }
+ }
+ }
+ return fontIndex;
+ }
+
+ /**
+ * Return a Font from a given font index with properties
+ * from attributes. The font index, which should have been produced
+ * by getFontIndex(), determines a font family. The size and style
+ * of the Font reflect the properties in attributes. Any Font or
+ * font family specifications in attributes are ignored, on the
+ * assumption that clients have already handled them.
+ * @param index an index from getFontIndex() which determines the
+ * font family
+ * @param attributes a Map from which the size and style of the Font
+ * are determined. The default size is 12 and the default style
+ * is Font.PLAIN
+ * @see #getFontIndex
+ */
+ public Font getFont(int index, Map attributes) {
+ Font font = defaultFont;
+
+ if (index >= 2) {
+ font = allFonts[index-2];
+ }
+
+ return font.deriveFont(attributes);
+ }
+
+ private static FontResolver INSTANCE;
+
+ /**
+ * Return a shared instance of FontResolver.
+ */
+ public static FontResolver getInstance() {
+ if (INSTANCE == null) {
+ INSTANCE = new FontResolver();
+ }
+ return INSTANCE;
+ }
+}