144 lines
5.4 KiB
Java
144 lines
5.4 KiB
Java
/*
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* Copyright (c) 1999, 2016, Oracle and/or its affiliates. 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.
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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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 4175418 8158924
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* @author John Raley
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* @summary This insures that bug 4175418: Font substitution in TextLayout /
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* LineBreakMeasurer is inconsistent has been fixed. The problem was
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* that text was measured in one Font, but lines were produced
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* in a different font.
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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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import java.text.AttributedString;
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import java.awt.font.LineBreakMeasurer;
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import java.awt.font.TextLayout;
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import java.awt.font.FontRenderContext;
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import java.awt.font.TextAttribute;
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/**
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* This insures that bug 4175418: Font substitution in TextLayout /
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* LineBreakMeasurer is inconsistent has been fixed. The problem was
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* that text was measured in one Font, but lines were produced
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* in a different font. One symptom of this problem is that lines are
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* either too short or too long. This test line-breaks a paragraph
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* and checks the line lengths to make sure breaks were chosen well.
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* This can be checked because the paragraph is so simple.
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*/
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public class TestLineBreakWithFontSub {
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public static void main(String[] args) {
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new TestLineBreakWithFontSub().test();
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System.out.println("Line break / font substitution test PASSED");
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}
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private static final String WORD = "word";
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private static final String SPACING = " ";
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// The Hebrew character in this string can trigger font substitution
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private static final String MIXED = "A\u05D0";
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private static final int NUM_WORDS = 12;
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private static final FontRenderContext DEFAULT_FRC =
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new FontRenderContext(null, false, false);
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public void test() {
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// construct a paragraph as follows: MIXED + [SPACING + WORD] + ...
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StringBuffer text = new StringBuffer(MIXED);
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for (int i=0; i < NUM_WORDS; i++) {
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text.append(SPACING);
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text.append(WORD);
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}
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AttributedString attrString = new AttributedString(text.toString());
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attrString.addAttribute(TextAttribute.SIZE, new Float(24.0));
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LineBreakMeasurer measurer = new LineBreakMeasurer(attrString.getIterator(),
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DEFAULT_FRC);
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// get width of a space-word sequence, in context
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int sequenceLength = WORD.length()+SPACING.length();
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measurer.setPosition(text.length() - sequenceLength);
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TextLayout layout = measurer.nextLayout(10000.0f);
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if (layout.getCharacterCount() != sequenceLength) {
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throw new Error("layout length is incorrect!");
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}
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final float sequenceAdvance = layout.getVisibleAdvance();
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float wrappingWidth = sequenceAdvance * 2;
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// now run test with a variety of widths
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while (wrappingWidth < (sequenceAdvance*NUM_WORDS)) {
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measurer.setPosition(0);
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checkMeasurer(measurer,
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wrappingWidth,
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sequenceAdvance,
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text.length());
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wrappingWidth += sequenceAdvance / 5;
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}
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}
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/**
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* Iterate through measurer and check that every line is
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* not too long and not too short, but just right.
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*/
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private void checkMeasurer(LineBreakMeasurer measurer,
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float wrappingWidth,
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float sequenceAdvance,
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int endPosition) {
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do {
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TextLayout layout = measurer.nextLayout(wrappingWidth);
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float visAdvance = layout.getVisibleAdvance();
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// Check that wrappingWidth-sequenceAdvance < visAdvance
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// Also, if we're not at the end of the paragraph,
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// check that visAdvance <= wrappingWidth
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if (visAdvance > wrappingWidth) {
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// line is too long for given wrapping width
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throw new Error("layout is too long");
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}
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if (measurer.getPosition() < endPosition) {
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if (visAdvance <= wrappingWidth - sequenceAdvance) {
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// line is too short for given wrapping width;
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// another word would have fit
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throw new Error("room for more words on line. diff=" +
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(wrappingWidth - sequenceAdvance - visAdvance));
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}
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}
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} while (measurer.getPosition() != endPosition);
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}
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}
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