author | rkennke |
Fri, 07 Aug 2009 18:31:11 +0200 | |
changeset 3928 | be186a33df9b |
parent 715 | f16baef3a20e |
child 5506 | 202f599c92aa |
permissions | -rw-r--r-- |
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/* |
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* Portions Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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/* |
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* (C) Copyright IBM Corp. 1999, All rights reserved. |
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*/ |
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package sun.font; |
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import java.awt.Font; |
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import java.awt.GraphicsEnvironment; |
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import java.awt.font.TextAttribute; |
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import java.util.ArrayList; |
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import java.util.Map; |
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import sun.text.CodePointIterator; |
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/** |
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* This class maps an individual character to a Font family which can |
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* display it. The character-to-Font mapping does not depend on the |
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* character's context, so a particular character will be mapped to the |
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* same font family each time. |
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* <p> |
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* Typically, clients will call getIndexFor(char) for each character |
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* in a style run. When getIndexFor() returns a different value from |
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* ones seen previously, the characters up to that point will be assigned |
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* a font obtained from getFont(). |
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*/ |
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public final class FontResolver { |
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// An array of all fonts available to the runtime. The fonts |
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// will be searched in order. |
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private Font[] allFonts; |
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private Font[] supplementaryFonts; |
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private int[] supplementaryIndices; |
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// Default size of Fonts (if created from an empty Map, for instance). |
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private static final int DEFAULT_SIZE = 12; // from Font |
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private Font defaultFont = new Font(Font.DIALOG, Font.PLAIN, DEFAULT_SIZE); |
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// The results of previous lookups are cached in a two-level |
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// table. The value for a character c is found in: |
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// blocks[c>>SHIFT][c&MASK] |
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// although the second array is only allocated when needed. |
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// A 0 value means the character's font has not been looked up. |
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// A positive value means the character's font is in the allFonts |
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// array at index (value-1). |
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private static final int SHIFT = 9; |
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private static final int BLOCKSIZE = 1<<(16-SHIFT); |
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private static final int MASK = BLOCKSIZE-1; |
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private int[][] blocks = new int[1<<SHIFT][]; |
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private FontResolver() { |
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} |
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private Font[] getAllFonts() { |
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if (allFonts == null) { |
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allFonts = |
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GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts(); |
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for (int i=0; i < allFonts.length; i++) { |
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allFonts[i] = allFonts[i].deriveFont((float)DEFAULT_SIZE); |
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} |
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} |
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return allFonts; |
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} |
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/** |
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* Search fonts in order, and return "1" to indicate its in the default |
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* font, (or not found at all), or the index of the first font |
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* which can display the given character, plus 2, if it is not |
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* in the default font. |
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*/ |
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private int getIndexFor(char c) { |
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if (defaultFont.canDisplay(c)) { |
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return 1; |
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} |
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for (int i=0; i < getAllFonts().length; i++) { |
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if (allFonts[i].canDisplay(c)) { |
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return i+2; |
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} |
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} |
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return 1; |
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} |
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private Font [] getAllSCFonts() { |
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if (supplementaryFonts == null) { |
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ArrayList<Font> fonts = new ArrayList<Font>(); |
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ArrayList<Integer> indices = new ArrayList<Integer>(); |
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for (int i=0; i<getAllFonts().length; i++) { |
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Font font = allFonts[i]; |
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Font2D font2D = FontUtilities.getFont2D(font); |
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if (font2D.hasSupplementaryChars()) { |
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fonts.add(font); |
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indices.add(Integer.valueOf(i)); |
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} |
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} |
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int len = fonts.size(); |
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supplementaryIndices = new int[len]; |
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for (int i=0; i<len; i++) { |
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supplementaryIndices[i] = indices.get(i); |
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} |
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supplementaryFonts = fonts.toArray(new Font[len]); |
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} |
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return supplementaryFonts; |
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} |
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/* This method is called only for character codes >= 0x10000 - which |
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* are assumed to be legal supplementary characters. |
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* It looks first at the default font (to avoid calling getAllFonts if at |
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* all possible) and if that doesn't map the code point, it scans |
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* just the fonts that may contain supplementary characters. |
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* The index that is returned is into the "allFonts" array so that |
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* callers see the same value for both supplementary and base chars. |
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*/ |
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private int getIndexFor(int cp) { |
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if (defaultFont.canDisplay(cp)) { |
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return 1; |
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} |
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for (int i = 0; i < getAllSCFonts().length; i++) { |
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if (supplementaryFonts[i].canDisplay(cp)) { |
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return supplementaryIndices[i]+2; |
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} |
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} |
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return 1; |
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} |
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/** |
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* Return an index for the given character. The index identifies a |
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* font family to getFont(), and has no other inherent meaning. |
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* @param c the character to map |
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* @return a value for consumption by getFont() |
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* @see #getFont |
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*/ |
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public int getFontIndex(char c) { |
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int blockIndex = c>>SHIFT; |
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int[] block = blocks[blockIndex]; |
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if (block == null) { |
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block = new int[BLOCKSIZE]; |
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blocks[blockIndex] = block; |
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} |
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int index = c & MASK; |
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if (block[index] == 0) { |
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block[index] = getIndexFor(c); |
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} |
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return block[index]; |
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} |
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public int getFontIndex(int cp) { |
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if (cp < 0x10000) { |
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return getFontIndex((char)cp); |
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} |
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return getIndexFor(cp); |
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} |
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/** |
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* Determines the font index for the code point at the current position in the |
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* iterator, then advances the iterator to the first code point that has |
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* a different index or until the iterator is DONE, and returns the font index. |
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* @param iter a code point iterator, this will be advanced past any code |
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* points that have the same font index |
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* @return the font index for the initial code point found, or 1 if the iterator |
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* was empty. |
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*/ |
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public int nextFontRunIndex(CodePointIterator iter) { |
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int cp = iter.next(); |
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int fontIndex = 1; |
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if (cp != CodePointIterator.DONE) { |
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fontIndex = getFontIndex(cp); |
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while ((cp = iter.next()) != CodePointIterator.DONE) { |
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if (getFontIndex(cp) != fontIndex) { |
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iter.prev(); |
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break; |
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} |
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} |
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} |
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return fontIndex; |
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} |
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/** |
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* Return a Font from a given font index with properties |
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* from attributes. The font index, which should have been produced |
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* by getFontIndex(), determines a font family. The size and style |
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* of the Font reflect the properties in attributes. Any Font or |
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* font family specifications in attributes are ignored, on the |
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* assumption that clients have already handled them. |
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* @param index an index from getFontIndex() which determines the |
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* font family |
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* @param attributes a Map from which the size and style of the Font |
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* are determined. The default size is 12 and the default style |
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* is Font.PLAIN |
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* @see #getFontIndex |
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*/ |
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public Font getFont(int index, Map attributes) { |
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Font font = defaultFont; |
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if (index >= 2) { |
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font = allFonts[index-2]; |
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} |
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return font.deriveFont(attributes); |
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} |
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private static FontResolver INSTANCE; |
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/** |
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* Return a shared instance of FontResolver. |
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*/ |
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public static FontResolver getInstance() { |
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if (INSTANCE == null) { |
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INSTANCE = new FontResolver(); |
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} |
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return INSTANCE; |
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} |
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} |