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