test/jdk/java/awt/Graphics2D/DrawString/LCDTextSrcEa.java

/*
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 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

/**
 * @test
 * @bug 6996867 8223543
 * @requires (os.family == "windows")
 * @summary Render as LCD Text in SrcEa composite mode.
 */

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;

public class LCDTextSrcEa {

    public static void main(String[] args) {
        String os = System.getProperty("os.name");
        if (os.toLowerCase().startsWith("mac")) {
            System.out.println("macOS doesn't support LCD any more. Skipping");
            return;
        }
        /* Sometimes freetype on Linux is built without LCD support, so
         * it can't be relied upon to test there.
         */
        if (os.toLowerCase().startsWith("linux")) {
            System.out.println("Linux freetype may not do LCD. Skipping");
            return;
        }
        int SZ=200;
        BufferedImage target =
            new BufferedImage(SZ, SZ, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = (Graphics2D) target.getGraphics();
        g2d.setColor(Color.white);
        g2d.fillRect(0, 0, SZ, SZ);

        g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 0.01f));
        g2d.setRenderingHint(
                RenderingHints.KEY_TEXT_ANTIALIASING,
                RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_VBGR);
        g2d.setRenderingHint(
               RenderingHints.KEY_ANTIALIASING,
               RenderingHints.VALUE_ANTIALIAS_ON);

        g2d.setColor(Color.black);
        g2d.drawString("Some sample text.", 10, 20);
        boolean nongrey = false;
        //Test BI: should be some non-greyscale color
        for (int px=0;px<SZ;px++) {
            for (int py=0;py<SZ;py++) {
                int rgb = target.getRGB(px, py);
                int r = (rgb & 0xff0000) >> 16;
                int g = (rgb & 0x00ff00) >> 8;
                int b = (rgb & 0x0000ff);
                if (r != g || r !=b || g != b) {
                     nongrey=true;
                     break;
                }
            }
        }
        if (!nongrey) {
            throw new RuntimeException("No LCD text found");
        }
    }
}