package test;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class ChangeImage {

public static BufferedImage makeRoundedCorner(BufferedImage image,
            int cornerRadius) {
        int w = image.getWidth();
        int h = image.getHeight();
        BufferedImage output = new BufferedImage(w, h,
                BufferedImage.TYPE_INT_ARGB);

Graphics2D g2 = output.createGraphics();

// This is what we want, but it only does hard-clipping, i.e. aliasing
        // g2.setClip(new RoundRectangle2D ...)

// so instead fake soft-clipping by first drawing the desired clip shape
        // in fully opaque white with antialiasing enabled...
        g2.setComposite(AlphaComposite.Src);
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(Color.WHITE);
        g2.fill(new RoundRectangle2D.Float(0, 0, w, h, cornerRadius,
                cornerRadius));

// ... then compositing the image on top,
        // using the white shape from above as alpha source
        g2.setComposite(AlphaComposite.SrcAtop);
        g2.drawImage(image, 0, 0, null);

g2.dispose();

return output;
    }

public static BufferedImage createResizedCopy(Image originalImage, int scaledWidth,
            int scaledHeight, boolean preserveAlpha) {
        int imageType = preserveAlpha ? BufferedImage.TYPE_INT_RGB
                : BufferedImage.TYPE_INT_ARGB;
        BufferedImage scaledBI = new BufferedImage(scaledWidth, scaledHeight,
                imageType);
        Graphics2D g = scaledBI.createGraphics();
        if (preserveAlpha) {
            g.setComposite(AlphaComposite.Src);
        }
        g.drawImage(originalImage, 0, 0, scaledWidth, scaledHeight, null);
        g.dispose();
        return scaledBI;
    }

public static void main(String[] args) throws IOException {
        BufferedImage icon = ImageIO.read(new File("/home/june/桌面/mm.jpg"));
        BufferedImage rounded = makeRoundedCorner(icon, 30);
        ImageIO.write(rounded, "png", new File("/home/june/桌面/mm_rounded.png"));
        
        BufferedImage pic = ImageIO.read(new File("/home/june/桌面/zhang.jpg"));
        BufferedImage resized = createResizedCopy(pic, 250, 250*768/1024, true);
        ImageIO.write(resized, "jpg", new File("/home/june/桌面/zhang_small.jpg"));
    }

}