From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/classpath/java/awt/font/TextMeasurer.java | 190 ++++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 libjava/classpath/java/awt/font/TextMeasurer.java (limited to 'libjava/classpath/java/awt/font/TextMeasurer.java') diff --git a/libjava/classpath/java/awt/font/TextMeasurer.java b/libjava/classpath/java/awt/font/TextMeasurer.java new file mode 100644 index 000000000..e443e8bc7 --- /dev/null +++ b/libjava/classpath/java/awt/font/TextMeasurer.java @@ -0,0 +1,190 @@ +/* TextMeasurer.java + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.awt.font; + +import java.text.AttributedCharacterIterator; +import java.awt.Shape; + +/** + * TextMeasurer is a small utility class for measuring the length of laid-out + * text objects. + * + * @author Sven de Marothy + * @since 1.3 + */ +public final class TextMeasurer implements Cloneable +{ + private AttributedCharacterIterator text; + private FontRenderContext frc; + private TextLayout totalLayout; + private int numChars; + + /** + * Creates a TextMeasurer from a given text in the form of an + * AttributedCharacterIterator and a + * FontRenderContext. + */ + public TextMeasurer (AttributedCharacterIterator text, FontRenderContext frc) + { + this.text = text; + this.frc = frc; + totalLayout = new TextLayout( text, frc ); + numChars = totalLayout.getCharacterCount(); + } + + /** + * Clones the TextMeasurer object + */ + protected Object clone () + { + return new TextMeasurer( text, frc ); + } + + /** + * Update the text if a character is deleted at the position deletePos + * @param newParagraph - the updated paragraph. + * @param deletePos - the deletion position + */ + public void deleteChar (AttributedCharacterIterator newParagraph, + int deletePos) + { + totalLayout = new TextLayout(newParagraph, frc); + if( deletePos < 0 || deletePos > totalLayout.getCharacterCount() ) + throw new NullPointerException("Invalid deletePos:"+deletePos); + numChars = totalLayout.getCharacterCount(); + text = newParagraph; + } + + /** + * Update the text if a character is inserted at the position insertPos + * @param newParagraph - the updated paragraph. + * @param insertPos - the insertion position + */ + public void insertChar (AttributedCharacterIterator newParagraph, + int insertPos) + { + totalLayout = new TextLayout(newParagraph, frc); + if( insertPos < 0 || insertPos > totalLayout.getCharacterCount() ) + throw new NullPointerException("Invalid insertPos:"+insertPos); + numChars = totalLayout.getCharacterCount(); + text = newParagraph; + } + + /*** + * Returns the total advance between two positions in the paragraph. + * Characters from start to limit-1 (inclusive) are included in this count. + * + * @param start - the starting character index. + * @param limit - the limiting index. + */ + public float getAdvanceBetween (int start, int limit) + { + Shape s = totalLayout.getLogicalHighlightShape( start, limit ); + return (float)s.getBounds2D().getWidth(); + } + + /** + * Returns a TextLayout object corresponding to the characters + * from text to limit. + * @param start - the starting character index. + * @param limit - the limiting index. + */ + public TextLayout getLayout (int start, int limit) + { + if( start >= limit ) + throw new IllegalArgumentException("Start position must be < limit."); + return new TextLayout( totalLayout, start, limit ); + } + + /** + * Returns the line-break index from a given starting index and a maximum + * advance. The index returned is the first character outside the given + * advance (or the limit of the string, if all remaining characters fit.) + * + * @param start - the starting index. + * @param maxAdvance - the maximum advance allowed. + * @return the index of the first character beyond maxAdvance, or the + * index of the last character + 1. + */ + public int getLineBreakIndex (int start, float maxAdvance) + { + if( start < 0 ) + throw new IllegalArgumentException("Start parameter must be > 0."); + + double remainingLength = getAdvanceBetween( start, numChars ); + + int guessOffset = (int)( ( (double)maxAdvance / (double)remainingLength) + * ( (double)numChars - (double)start ) ); + guessOffset += start; + if( guessOffset > numChars ) + guessOffset = numChars; + + double guessLength = getAdvanceBetween( start, guessOffset ); + boolean makeSmaller = ( guessLength > maxAdvance ); + int inc = makeSmaller ? -1 : 1; + boolean keepGoing = true; + + do + { + guessOffset = guessOffset + inc; + if( guessOffset <= start || guessOffset > numChars ) + { + keepGoing = false; + } + else + { + guessLength = getAdvanceBetween( start, guessOffset ); + if( makeSmaller && ( guessLength <= maxAdvance) ) + keepGoing = false; + if( !makeSmaller && ( guessLength >= maxAdvance) ) + keepGoing = false; + } + } + while( keepGoing ); + + // Return first index that doesn't fit. + if( !makeSmaller ) + guessOffset--; + + if( guessOffset > numChars ) + return numChars; + + return guessOffset; + } +} -- cgit v1.2.3