ojluni/src/main/java/sun/font/FontResolver.java - platform/libcore.git - Git at Google

 /*
  * Copyright (c) 1999, 2008, Oracle and/or its affiliates. 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.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.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 = FontUtilities.getFont2D(font);
                 if (font2D.hasSupplementaryChars()) {
                     fonts.add(font);
                     indices.add(Integer.valueOf(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;
     }
 }
	/*
	* Copyright (c) 1999, 2008, Oracle and/or its affiliates. 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. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.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 = FontUtilities.getFont2D(font);
	if (font2D.hasSupplementaryChars()) {
	fonts.add(font);
	indices.add(Integer.valueOf(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;
	}
	}