175 lines
6.6 KiB
Java
175 lines
6.6 KiB
Java
/*
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* Copyright (c) 1999, 2024, 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 4269775 8341535
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* @summary Check that different text rendering APIs agree
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*/
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/**
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* Draw into an image rendering the same text string nine different
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* ways: as a TextLayout, a simple String, and a GlyphVector, each
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* with three different x scale factors. The expectation is that each
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* set of three strings would appear the same although offset in y to
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* avoid overlap. The bug was that the y positions of the individual characters
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* of the TextLayout and GlyphVector were wrong, so the strings appeared
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* to be rendered at different angles.
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*/
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics2D;
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import java.awt.RenderingHints;
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import java.awt.font.FontRenderContext;
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import java.awt.font.GlyphVector;
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import java.awt.font.TextLayout;
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import java.awt.geom.AffineTransform;
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import java.awt.image.BufferedImage;
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import javax.imageio.ImageIO;
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import java.io.File;
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import java.util.HashMap;
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public class TestDevTransform {
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static HashMap<RenderingHints.Key, Object> hints = new HashMap<>();
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static {
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hints.put(RenderingHints.KEY_ANTIALIASING,
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RenderingHints.VALUE_ANTIALIAS_ON);
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hints.put(RenderingHints.KEY_TEXT_ANTIALIASING,
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RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
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hints.put(RenderingHints.KEY_FRACTIONALMETRICS,
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RenderingHints.VALUE_FRACTIONALMETRICS_ON);
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}
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static String test = "This is only a test";
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static double angle = Math.PI / 6.0; // Rotate 30 degrees
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static final int W = 400, H = 400;
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static void draw(Graphics2D g2d, TextLayout layout,
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float x, float y, float scalex) {
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AffineTransform saveTransform = g2d.getTransform();
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g2d.translate(x, y);
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g2d.rotate(angle);
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g2d.scale(scalex, 1f);
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layout.draw(g2d, 0f, 0f);
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g2d.setTransform(saveTransform);
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}
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static void draw(Graphics2D g2d, String string,
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float x, float y, float scalex) {
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AffineTransform saveTransform = g2d.getTransform();
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g2d.translate(x, y);
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g2d.rotate(angle);
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g2d.scale(scalex, 1f);
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g2d.drawString(string, 0f, 0f);
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g2d.setTransform(saveTransform);
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}
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static void draw(Graphics2D g2d, GlyphVector gv,
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float x, float y, float scalex) {
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AffineTransform saveTransform = g2d.getTransform();
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g2d.translate(x, y);
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g2d.rotate(angle);
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g2d.scale(scalex, 1f);
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g2d.drawGlyphVector(gv, 0f, 0f);
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g2d.setTransform(saveTransform);
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}
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static void init(Graphics2D g2d) {
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g2d.setColor(Color.white);
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g2d.fillRect(0, 0, W, H);
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g2d.setColor(Color.black);
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g2d.scale(1.481f, 1.481); // Convert to 108 dpi
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g2d.addRenderingHints(hints);
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Font font = new Font(Font.DIALOG, Font.PLAIN, 12);
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g2d.setFont(font);
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}
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static void compare(BufferedImage bi1, String name1, BufferedImage bi2, String name2) throws Exception {
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int nonWhite1 = 0;
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int nonWhite2 = 0;
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int differences = 0;
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int whitePixel = Color.white.getRGB();
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for (int x = 0; x < bi1.getWidth(); x++) {
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for (int y = 0; y < bi1.getHeight(); y++) {
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int pix1 = bi1.getRGB(x, y);
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int pix2 = bi2.getRGB(x, y);
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if (pix1 != whitePixel) { nonWhite1++; }
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if (pix2 != whitePixel) { nonWhite2++; }
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if (bi1.getRGB(x, y) != bi2.getRGB(x, y)) {
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differences++;
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}
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}
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}
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int nonWhite = (nonWhite1 < nonWhite2) ? nonWhite1 : nonWhite2;
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if (differences > 0 && ((nonWhite / differences) < 20)) {
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ImageIO.write(bi1, "png", new File(name1 + ".png"));
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ImageIO.write(bi2, "png", new File(name2 + ".png"));
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System.err.println("nonWhite image 1 = " + nonWhite1);
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System.err.println("nonWhite image 2 = " + nonWhite2);
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System.err.println("Number of non-white differing pixels=" + differences);
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throw new RuntimeException("Different rendering: " + differences + " pixels differ.");
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}
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}
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public static void main(String args[]) throws Exception {
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BufferedImage tl_Image = new BufferedImage(W, H, BufferedImage.TYPE_INT_RGB);
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{
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Graphics2D tl_g2d = tl_Image.createGraphics();
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init(tl_g2d);
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FontRenderContext frc = tl_g2d.getFontRenderContext();
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// Specify font from graphics to be sure it is the same as the other cases.
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TextLayout tl = new TextLayout(test, tl_g2d.getFont(), frc);
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draw(tl_g2d, tl, 10f, 12f, 3.0f);
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draw(tl_g2d, tl, 10f, 24f, 1.0f);
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draw(tl_g2d, tl, 10f, 36f, 0.33f);
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}
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BufferedImage st_Image = new BufferedImage(400, 400, BufferedImage.TYPE_INT_RGB);
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{
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Graphics2D st_g2d = st_Image.createGraphics();
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init(st_g2d);
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draw(st_g2d, test, 10f, 12f, 3.0f);
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draw(st_g2d, test, 10f, 24f, 1.0f);
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draw(st_g2d, test, 10f, 36f, .33f);
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}
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BufferedImage gv_Image = new BufferedImage(400, 400, BufferedImage.TYPE_INT_RGB);
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{
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Graphics2D gv_g2d = gv_Image.createGraphics();
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init(gv_g2d);
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FontRenderContext frc = gv_g2d.getFontRenderContext();
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GlyphVector gv = gv_g2d.getFont().createGlyphVector(frc, test);
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draw(gv_g2d, gv, 10f, 12f, 3.0f);
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draw(gv_g2d, gv, 10f, 24f, 1.0f);
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draw(gv_g2d, gv, 10f, 36f, .33f);
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}
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compare(tl_Image, "textlayout", st_Image, "string");
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compare(gv_Image, "glyphvector", st_Image, "string");
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}
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}
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