70 lines
2.5 KiB
Java
70 lines
2.5 KiB
Java
/*
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* Copyright (c) 2022, 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 8299255
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* @summary Verify no round error in Font scaling
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*/
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import java.awt.Font;
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import java.awt.Graphics2D;
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import java.awt.font.FontRenderContext;
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import java.awt.font.LineMetrics;
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import java.awt.geom.AffineTransform;
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import java.awt.image.BufferedImage;
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public class FontScalerRoundTest {
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public static void main(String[] args) {
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final double SCALE = 4096.0;
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final double STEP = 0.0001;
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final double LIMIT = STEP * 100.0;
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BufferedImage img = new BufferedImage(100, 100,
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BufferedImage.TYPE_INT_ARGB);
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Graphics2D g2d = img.createGraphics();
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FontRenderContext frc = g2d.getFontRenderContext();
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Font font = new Font(Font.DIALOG, Font.PLAIN, 1);
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float h1 = getScaledHeight(font, frc, SCALE);
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float h2 = getScaledHeight(font, frc, SCALE + STEP);
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float diff = Math.abs(h1 - h2);
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if (diff > LIMIT) {
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throw new RuntimeException("Font metrix had round error " +
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h1 + "," + h2);
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}
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}
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private static float getScaledHeight(Font font,
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FontRenderContext frc,
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double scale) {
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AffineTransform at = new AffineTransform(scale, 0.0, 0.0, scale,
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0.0, 0.0);
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Font transFont = font.deriveFont(at);
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LineMetrics m = transFont.getLineMetrics("0", frc);
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return m.getHeight();
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}
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}
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