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/*
* Copyright (c) 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.
*/
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
/*
* @test
* @bug 8339974
* @summary Verifies that text draws correctly using scaled and rotated fonts.
*/
public class RotatedScaledFontTest {
public static void main(String[] args) throws Exception {
test(0);
test(1);
test(2);
test(3);
test(4);
}
private static void test(int quadrants) throws Exception {
int size = 2000;
int center = size / 2;
Font base = new Font("SansSerif", Font.PLAIN, 10);
BufferedImage image = new BufferedImage(size, size, BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g2d = image.createGraphics();
try {
for (int scale = 1; scale <= 100; scale++) {
AffineTransform at = AffineTransform.getQuadrantRotateInstance(quadrants);
at.scale(scale, scale);
Font font = base.deriveFont(at);
g2d.setColor(Color.WHITE);
g2d.fillRect(0, 0, image.getWidth(), image.getHeight());
g2d.setColor(Color.BLACK);
g2d.setFont(font);
g2d.drawString("TEST", center, center);
Rectangle bounds = findTextBoundingBox(image);
if (bounds == null) {
saveImage("bounds", image);
throw new RuntimeException("Text missing: scale=" + scale
+ ", quadrants=" + quadrants + ", center=" + center);
}
boolean horizontal = (bounds.width > bounds.height);
boolean expectedHorizontal = (quadrants % 2 == 0);
if (horizontal != expectedHorizontal) {
saveImage("orientation", image);
throw new RuntimeException("Wrong orientation: scale=" + scale
+ ", quadrants=" + quadrants + ", center=" + center
+ ", bounds=" + bounds + ", horizontal=" + horizontal
+ ", expectedHorizontal=" + expectedHorizontal);
}
if (!roughlyEqual(center, bounds.x, scale) && !roughlyEqual(center, bounds.x + bounds.width, scale)) {
saveImage("xedge", image);
throw new RuntimeException("No x-edge at center: scale=" + scale
+ ", quadrants=" + quadrants + ", center=" + center
+ ", bounds=" + bounds);
}
if (!roughlyEqual(center, bounds.y, scale) && !roughlyEqual(center, bounds.y + bounds.height, scale)) {
saveImage("yedge", image);
throw new RuntimeException("No y-edge at center: scale=" + scale
+ ", quadrants=" + quadrants + ", center=" + center
+ ", bounds=" + bounds);
}
}
} finally {
g2d.dispose();
}
}
private static Rectangle findTextBoundingBox(BufferedImage image) {
int minX = Integer.MAX_VALUE;
int minY = Integer.MAX_VALUE;
int maxX = Integer.MIN_VALUE;
int maxY = Integer.MIN_VALUE;
int width = image.getWidth();
int height = image.getHeight();
int[] rowPixels = new int[width];
for (int y = 0; y < height; y++) {
image.getRGB(0, y, width, 1, rowPixels, 0, width);
for (int x = 0; x < width; x++) {
boolean white = (rowPixels[x] == -1);
if (!white) {
if (x < minX) {
minX = x;
}
if (y < minY) {
minY = y;
}
if (x > maxX) {
maxX = x;
}
if (y > maxY) {
maxY = y;
}
}
}
}
if (minX != Integer.MAX_VALUE) {
return new Rectangle(minX, minY, maxX - minX, maxY - minY);
} else {
return null;
}
}
private static boolean roughlyEqual(int x1, int x2, int scale) {
return Math.abs(x1 - x2) <= Math.ceil(scale / 2d) + 1; // higher scale = higher allowed variance
}
private static void saveImage(String name, BufferedImage image) {
try {
String dir = System.getProperty("test.classes", ".");
String path = dir + File.separator + name + ".png";
File file = new File(path);
ImageIO.write(image, "png", file);
} catch (Exception e) {
// we tried, and that's enough
}
}
}
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