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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
 *
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 */

import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.awt.geom.AffineTransform;
import java.awt.image.ColorModel;
import java.awt.image.Raster;
import java.util.Arrays;
import sun.java2d.StateTrackable;
import sun.java2d.SunGraphics2D;
import sun.java2d.SurfaceData;
import sun.java2d.loops.SurfaceType;

/**
 * @test
 * @bug 8142966
 * @author Alexander Scherbatiy
 * @summary Wrong cursor position in text components on HiDPI display
 * @modules java.desktop/sun.java2d java.desktop/sun.java2d.loops
 */
public class HiDPIGlyphAdvanceTest {

    private static final int SCREEN_SIZE = 400;
    private static final Color BACKGROUND_COLOR = Color.WHITE;

    public static void main(String[] args) throws Exception {

        char[] chars = ("abcdefghijklmnopqrstuwxyz"
                      + "ABCDEFGHIJKLMNOPQRSTUWXYZ").toCharArray();
        int textWidth1 = getTextWidth(chars, 1);
        int textWidth2 = getTextWidth(chars, 2);

        if (textWidth1 != textWidth2) {
            throw new RuntimeException("Glyph advances are not the same"
                    + " for different UI scale factors!");
        }
    }

    private static int getTextWidth(char[] chars, double configScale) {

        TestSurfaceData surface = new TestSurfaceData(SCREEN_SIZE, SCREEN_SIZE,
                configScale);
        SunGraphics2D g2d = new SunGraphics2D(surface,
                Color.BLACK, Color.BLACK, null);
        FontMetrics fm = g2d.getFontMetrics();
        int textWidth = fm.charsWidth(chars, 0, chars.length);
        g2d.dispose();
        return textWidth;
    }

    static class TestGraphicsConfig extends GraphicsConfiguration {

        private final double scale;

        TestGraphicsConfig(double scale) {
            this.scale = scale;
        }

        @Override
        public GraphicsDevice getDevice() {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        @Override
        public ColorModel getColorModel() {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        @Override
        public ColorModel getColorModel(int transparency) {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        @Override
        public AffineTransform getDefaultTransform() {
            return AffineTransform.getScaleInstance(scale, scale);
        }

        @Override
        public AffineTransform getNormalizingTransform() {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        @Override
        public Rectangle getBounds() {
            throw new UnsupportedOperationException("Not supported yet.");
        }
    }

    static class TestSurfaceData extends SurfaceData {

        private final int width;
        private final int height;
        private final GraphicsConfiguration gc;
        private final BufferedImage buffImage;

        public TestSurfaceData(int width, int height, double scale) {
            super(StateTrackable.State.DYNAMIC, SurfaceType.Custom, ColorModel.getRGBdefault());
            gc = new TestGraphicsConfig(scale);
            this.width = (int) Math.ceil(scale * width);
            this.height = (int) Math.ceil(scale * height);
            buffImage = new BufferedImage(this.width, this.height,
                    BufferedImage.TYPE_INT_RGB);

            Graphics imageGraphics = buffImage.createGraphics();
            imageGraphics.setColor(BACKGROUND_COLOR);
            imageGraphics.fillRect(0, 0, this.width, this.height);
            imageGraphics.dispose();
        }

        @Override
        public SurfaceData getReplacement() {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        @Override
        public GraphicsConfiguration getDeviceConfiguration() {
            return gc;
        }

        @Override
        public Raster getRaster(int x, int y, int w, int h) {
            return buffImage.getRaster();
        }

        @Override
        public Rectangle getBounds() {
            return new Rectangle(0, 0, width, height);
        }

        @Override
        public Object getDestination() {
            throw new UnsupportedOperationException("Not supported yet.");
        }
    }
}